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6c2bb98bc3
Up until now algorithms have been happy to get a context pointer since they know everything that's in the tfm already (e.g., alignment, block size). However, once we have parameterised algorithms, such information will be specific to each tfm. So the algorithm API needs to be changed to pass the tfm structure instead of the context pointer. This patch is basically a text substitution. The only tricky bit is the assembly routines that need to get the context pointer offset through asm-offsets.h. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
908 lines
45 KiB
C
908 lines
45 KiB
C
/*
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* Twofish for CryptoAPI
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*
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* Originally Twofish for GPG
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* By Matthew Skala <mskala@ansuz.sooke.bc.ca>, July 26, 1998
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* 256-bit key length added March 20, 1999
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* Some modifications to reduce the text size by Werner Koch, April, 1998
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* Ported to the kerneli patch by Marc Mutz <Marc@Mutz.com>
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* Ported to CryptoAPI by Colin Slater <hoho@tacomeat.net>
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*
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* The original author has disclaimed all copyright interest in this
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* code and thus put it in the public domain. The subsequent authors
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* have put this under the GNU General Public License.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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* USA
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*
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* This code is a "clean room" implementation, written from the paper
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* _Twofish: A 128-Bit Block Cipher_ by Bruce Schneier, John Kelsey,
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* Doug Whiting, David Wagner, Chris Hall, and Niels Ferguson, available
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* through http://www.counterpane.com/twofish.html
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*
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* For background information on multiplication in finite fields, used for
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* the matrix operations in the key schedule, see the book _Contemporary
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* Abstract Algebra_ by Joseph A. Gallian, especially chapter 22 in the
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* Third Edition.
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*/
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#include <asm/byteorder.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/types.h>
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#include <linux/errno.h>
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#include <linux/crypto.h>
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#include <linux/bitops.h>
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/* The large precomputed tables for the Twofish cipher (twofish.c)
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* Taken from the same source as twofish.c
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* Marc Mutz <Marc@Mutz.com>
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*/
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/* These two tables are the q0 and q1 permutations, exactly as described in
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* the Twofish paper. */
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static const u8 q0[256] = {
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0xA9, 0x67, 0xB3, 0xE8, 0x04, 0xFD, 0xA3, 0x76, 0x9A, 0x92, 0x80, 0x78,
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0xE4, 0xDD, 0xD1, 0x38, 0x0D, 0xC6, 0x35, 0x98, 0x18, 0xF7, 0xEC, 0x6C,
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0x43, 0x75, 0x37, 0x26, 0xFA, 0x13, 0x94, 0x48, 0xF2, 0xD0, 0x8B, 0x30,
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0x84, 0x54, 0xDF, 0x23, 0x19, 0x5B, 0x3D, 0x59, 0xF3, 0xAE, 0xA2, 0x82,
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0x63, 0x01, 0x83, 0x2E, 0xD9, 0x51, 0x9B, 0x7C, 0xA6, 0xEB, 0xA5, 0xBE,
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0x16, 0x0C, 0xE3, 0x61, 0xC0, 0x8C, 0x3A, 0xF5, 0x73, 0x2C, 0x25, 0x0B,
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0xBB, 0x4E, 0x89, 0x6B, 0x53, 0x6A, 0xB4, 0xF1, 0xE1, 0xE6, 0xBD, 0x45,
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0xE2, 0xF4, 0xB6, 0x66, 0xCC, 0x95, 0x03, 0x56, 0xD4, 0x1C, 0x1E, 0xD7,
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0xFB, 0xC3, 0x8E, 0xB5, 0xE9, 0xCF, 0xBF, 0xBA, 0xEA, 0x77, 0x39, 0xAF,
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0x33, 0xC9, 0x62, 0x71, 0x81, 0x79, 0x09, 0xAD, 0x24, 0xCD, 0xF9, 0xD8,
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0xE5, 0xC5, 0xB9, 0x4D, 0x44, 0x08, 0x86, 0xE7, 0xA1, 0x1D, 0xAA, 0xED,
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0x06, 0x70, 0xB2, 0xD2, 0x41, 0x7B, 0xA0, 0x11, 0x31, 0xC2, 0x27, 0x90,
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0x20, 0xF6, 0x60, 0xFF, 0x96, 0x5C, 0xB1, 0xAB, 0x9E, 0x9C, 0x52, 0x1B,
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0x5F, 0x93, 0x0A, 0xEF, 0x91, 0x85, 0x49, 0xEE, 0x2D, 0x4F, 0x8F, 0x3B,
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0x47, 0x87, 0x6D, 0x46, 0xD6, 0x3E, 0x69, 0x64, 0x2A, 0xCE, 0xCB, 0x2F,
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0xFC, 0x97, 0x05, 0x7A, 0xAC, 0x7F, 0xD5, 0x1A, 0x4B, 0x0E, 0xA7, 0x5A,
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0x28, 0x14, 0x3F, 0x29, 0x88, 0x3C, 0x4C, 0x02, 0xB8, 0xDA, 0xB0, 0x17,
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0x55, 0x1F, 0x8A, 0x7D, 0x57, 0xC7, 0x8D, 0x74, 0xB7, 0xC4, 0x9F, 0x72,
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0x7E, 0x15, 0x22, 0x12, 0x58, 0x07, 0x99, 0x34, 0x6E, 0x50, 0xDE, 0x68,
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0x65, 0xBC, 0xDB, 0xF8, 0xC8, 0xA8, 0x2B, 0x40, 0xDC, 0xFE, 0x32, 0xA4,
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0xCA, 0x10, 0x21, 0xF0, 0xD3, 0x5D, 0x0F, 0x00, 0x6F, 0x9D, 0x36, 0x42,
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0x4A, 0x5E, 0xC1, 0xE0
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};
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static const u8 q1[256] = {
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0x75, 0xF3, 0xC6, 0xF4, 0xDB, 0x7B, 0xFB, 0xC8, 0x4A, 0xD3, 0xE6, 0x6B,
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0x45, 0x7D, 0xE8, 0x4B, 0xD6, 0x32, 0xD8, 0xFD, 0x37, 0x71, 0xF1, 0xE1,
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0x30, 0x0F, 0xF8, 0x1B, 0x87, 0xFA, 0x06, 0x3F, 0x5E, 0xBA, 0xAE, 0x5B,
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0x8A, 0x00, 0xBC, 0x9D, 0x6D, 0xC1, 0xB1, 0x0E, 0x80, 0x5D, 0xD2, 0xD5,
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0xA0, 0x84, 0x07, 0x14, 0xB5, 0x90, 0x2C, 0xA3, 0xB2, 0x73, 0x4C, 0x54,
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0x92, 0x74, 0x36, 0x51, 0x38, 0xB0, 0xBD, 0x5A, 0xFC, 0x60, 0x62, 0x96,
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0x6C, 0x42, 0xF7, 0x10, 0x7C, 0x28, 0x27, 0x8C, 0x13, 0x95, 0x9C, 0xC7,
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0x24, 0x46, 0x3B, 0x70, 0xCA, 0xE3, 0x85, 0xCB, 0x11, 0xD0, 0x93, 0xB8,
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0xA6, 0x83, 0x20, 0xFF, 0x9F, 0x77, 0xC3, 0xCC, 0x03, 0x6F, 0x08, 0xBF,
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0x40, 0xE7, 0x2B, 0xE2, 0x79, 0x0C, 0xAA, 0x82, 0x41, 0x3A, 0xEA, 0xB9,
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0xE4, 0x9A, 0xA4, 0x97, 0x7E, 0xDA, 0x7A, 0x17, 0x66, 0x94, 0xA1, 0x1D,
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0x3D, 0xF0, 0xDE, 0xB3, 0x0B, 0x72, 0xA7, 0x1C, 0xEF, 0xD1, 0x53, 0x3E,
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0x8F, 0x33, 0x26, 0x5F, 0xEC, 0x76, 0x2A, 0x49, 0x81, 0x88, 0xEE, 0x21,
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0xC4, 0x1A, 0xEB, 0xD9, 0xC5, 0x39, 0x99, 0xCD, 0xAD, 0x31, 0x8B, 0x01,
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0x18, 0x23, 0xDD, 0x1F, 0x4E, 0x2D, 0xF9, 0x48, 0x4F, 0xF2, 0x65, 0x8E,
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0x78, 0x5C, 0x58, 0x19, 0x8D, 0xE5, 0x98, 0x57, 0x67, 0x7F, 0x05, 0x64,
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0xAF, 0x63, 0xB6, 0xFE, 0xF5, 0xB7, 0x3C, 0xA5, 0xCE, 0xE9, 0x68, 0x44,
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0xE0, 0x4D, 0x43, 0x69, 0x29, 0x2E, 0xAC, 0x15, 0x59, 0xA8, 0x0A, 0x9E,
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0x6E, 0x47, 0xDF, 0x34, 0x35, 0x6A, 0xCF, 0xDC, 0x22, 0xC9, 0xC0, 0x9B,
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0x89, 0xD4, 0xED, 0xAB, 0x12, 0xA2, 0x0D, 0x52, 0xBB, 0x02, 0x2F, 0xA9,
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0xD7, 0x61, 0x1E, 0xB4, 0x50, 0x04, 0xF6, 0xC2, 0x16, 0x25, 0x86, 0x56,
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0x55, 0x09, 0xBE, 0x91
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};
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/* These MDS tables are actually tables of MDS composed with q0 and q1,
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* because it is only ever used that way and we can save some time by
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* precomputing. Of course the main saving comes from precomputing the
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* GF(2^8) multiplication involved in the MDS matrix multiply; by looking
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* things up in these tables we reduce the matrix multiply to four lookups
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* and three XORs. Semi-formally, the definition of these tables is:
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* mds[0][i] = MDS (q1[i] 0 0 0)^T mds[1][i] = MDS (0 q0[i] 0 0)^T
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* mds[2][i] = MDS (0 0 q1[i] 0)^T mds[3][i] = MDS (0 0 0 q0[i])^T
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* where ^T means "transpose", the matrix multiply is performed in GF(2^8)
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* represented as GF(2)[x]/v(x) where v(x)=x^8+x^6+x^5+x^3+1 as described
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* by Schneier et al, and I'm casually glossing over the byte/word
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* conversion issues. */
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static const u32 mds[4][256] = {
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{0xBCBC3275, 0xECEC21F3, 0x202043C6, 0xB3B3C9F4, 0xDADA03DB, 0x02028B7B,
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0xE2E22BFB, 0x9E9EFAC8, 0xC9C9EC4A, 0xD4D409D3, 0x18186BE6, 0x1E1E9F6B,
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0x98980E45, 0xB2B2387D, 0xA6A6D2E8, 0x2626B74B, 0x3C3C57D6, 0x93938A32,
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0x8282EED8, 0x525298FD, 0x7B7BD437, 0xBBBB3771, 0x5B5B97F1, 0x474783E1,
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0x24243C30, 0x5151E20F, 0xBABAC6F8, 0x4A4AF31B, 0xBFBF4887, 0x0D0D70FA,
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0xB0B0B306, 0x7575DE3F, 0xD2D2FD5E, 0x7D7D20BA, 0x666631AE, 0x3A3AA35B,
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0x59591C8A, 0x00000000, 0xCDCD93BC, 0x1A1AE09D, 0xAEAE2C6D, 0x7F7FABC1,
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0x2B2BC7B1, 0xBEBEB90E, 0xE0E0A080, 0x8A8A105D, 0x3B3B52D2, 0x6464BAD5,
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0xD8D888A0, 0xE7E7A584, 0x5F5FE807, 0x1B1B1114, 0x2C2CC2B5, 0xFCFCB490,
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0x3131272C, 0x808065A3, 0x73732AB2, 0x0C0C8173, 0x79795F4C, 0x6B6B4154,
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0x4B4B0292, 0x53536974, 0x94948F36, 0x83831F51, 0x2A2A3638, 0xC4C49CB0,
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0x2222C8BD, 0xD5D5F85A, 0xBDBDC3FC, 0x48487860, 0xFFFFCE62, 0x4C4C0796,
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0x4141776C, 0xC7C7E642, 0xEBEB24F7, 0x1C1C1410, 0x5D5D637C, 0x36362228,
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0x6767C027, 0xE9E9AF8C, 0x4444F913, 0x1414EA95, 0xF5F5BB9C, 0xCFCF18C7,
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0x3F3F2D24, 0xC0C0E346, 0x7272DB3B, 0x54546C70, 0x29294CCA, 0xF0F035E3,
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0x0808FE85, 0xC6C617CB, 0xF3F34F11, 0x8C8CE4D0, 0xA4A45993, 0xCACA96B8,
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0x68683BA6, 0xB8B84D83, 0x38382820, 0xE5E52EFF, 0xADAD569F, 0x0B0B8477,
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0xC8C81DC3, 0x9999FFCC, 0x5858ED03, 0x19199A6F, 0x0E0E0A08, 0x95957EBF,
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0x70705040, 0xF7F730E7, 0x6E6ECF2B, 0x1F1F6EE2, 0xB5B53D79, 0x09090F0C,
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0x616134AA, 0x57571682, 0x9F9F0B41, 0x9D9D803A, 0x111164EA, 0x2525CDB9,
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0xAFAFDDE4, 0x4545089A, 0xDFDF8DA4, 0xA3A35C97, 0xEAEAD57E, 0x353558DA,
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0xEDEDD07A, 0x4343FC17, 0xF8F8CB66, 0xFBFBB194, 0x3737D3A1, 0xFAFA401D,
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0xC2C2683D, 0xB4B4CCF0, 0x32325DDE, 0x9C9C71B3, 0x5656E70B, 0xE3E3DA72,
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0x878760A7, 0x15151B1C, 0xF9F93AEF, 0x6363BFD1, 0x3434A953, 0x9A9A853E,
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0xB1B1428F, 0x7C7CD133, 0x88889B26, 0x3D3DA65F, 0xA1A1D7EC, 0xE4E4DF76,
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0x8181942A, 0x91910149, 0x0F0FFB81, 0xEEEEAA88, 0x161661EE, 0xD7D77321,
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0x9797F5C4, 0xA5A5A81A, 0xFEFE3FEB, 0x6D6DB5D9, 0x7878AEC5, 0xC5C56D39,
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0x1D1DE599, 0x7676A4CD, 0x3E3EDCAD, 0xCBCB6731, 0xB6B6478B, 0xEFEF5B01,
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0x12121E18, 0x6060C523, 0x6A6AB0DD, 0x4D4DF61F, 0xCECEE94E, 0xDEDE7C2D,
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0x55559DF9, 0x7E7E5A48, 0x2121B24F, 0x03037AF2, 0xA0A02665, 0x5E5E198E,
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0x5A5A6678, 0x65654B5C, 0x62624E58, 0xFDFD4519, 0x0606F48D, 0x404086E5,
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0xF2F2BE98, 0x3333AC57, 0x17179067, 0x05058E7F, 0xE8E85E05, 0x4F4F7D64,
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0x89896AAF, 0x10109563, 0x74742FB6, 0x0A0A75FE, 0x5C5C92F5, 0x9B9B74B7,
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0x2D2D333C, 0x3030D6A5, 0x2E2E49CE, 0x494989E9, 0x46467268, 0x77775544,
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0xA8A8D8E0, 0x9696044D, 0x2828BD43, 0xA9A92969, 0xD9D97929, 0x8686912E,
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0xD1D187AC, 0xF4F44A15, 0x8D8D1559, 0xD6D682A8, 0xB9B9BC0A, 0x42420D9E,
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0xF6F6C16E, 0x2F2FB847, 0xDDDD06DF, 0x23233934, 0xCCCC6235, 0xF1F1C46A,
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0xC1C112CF, 0x8585EBDC, 0x8F8F9E22, 0x7171A1C9, 0x9090F0C0, 0xAAAA539B,
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0x0101F189, 0x8B8BE1D4, 0x4E4E8CED, 0x8E8E6FAB, 0xABABA212, 0x6F6F3EA2,
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0xE6E6540D, 0xDBDBF252, 0x92927BBB, 0xB7B7B602, 0x6969CA2F, 0x3939D9A9,
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0xD3D30CD7, 0xA7A72361, 0xA2A2AD1E, 0xC3C399B4, 0x6C6C4450, 0x07070504,
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0x04047FF6, 0x272746C2, 0xACACA716, 0xD0D07625, 0x50501386, 0xDCDCF756,
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0x84841A55, 0xE1E15109, 0x7A7A25BE, 0x1313EF91},
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{0xA9D93939, 0x67901717, 0xB3719C9C, 0xE8D2A6A6, 0x04050707, 0xFD985252,
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0xA3658080, 0x76DFE4E4, 0x9A084545, 0x92024B4B, 0x80A0E0E0, 0x78665A5A,
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0xE4DDAFAF, 0xDDB06A6A, 0xD1BF6363, 0x38362A2A, 0x0D54E6E6, 0xC6432020,
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0x3562CCCC, 0x98BEF2F2, 0x181E1212, 0xF724EBEB, 0xECD7A1A1, 0x6C774141,
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0x43BD2828, 0x7532BCBC, 0x37D47B7B, 0x269B8888, 0xFA700D0D, 0x13F94444,
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0x94B1FBFB, 0x485A7E7E, 0xF27A0303, 0xD0E48C8C, 0x8B47B6B6, 0x303C2424,
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0x84A5E7E7, 0x54416B6B, 0xDF06DDDD, 0x23C56060, 0x1945FDFD, 0x5BA33A3A,
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0x3D68C2C2, 0x59158D8D, 0xF321ECEC, 0xAE316666, 0xA23E6F6F, 0x82165757,
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0x63951010, 0x015BEFEF, 0x834DB8B8, 0x2E918686, 0xD9B56D6D, 0x511F8383,
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0x9B53AAAA, 0x7C635D5D, 0xA63B6868, 0xEB3FFEFE, 0xA5D63030, 0xBE257A7A,
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0x16A7ACAC, 0x0C0F0909, 0xE335F0F0, 0x6123A7A7, 0xC0F09090, 0x8CAFE9E9,
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0x3A809D9D, 0xF5925C5C, 0x73810C0C, 0x2C273131, 0x2576D0D0, 0x0BE75656,
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0xBB7B9292, 0x4EE9CECE, 0x89F10101, 0x6B9F1E1E, 0x53A93434, 0x6AC4F1F1,
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0xB499C3C3, 0xF1975B5B, 0xE1834747, 0xE66B1818, 0xBDC82222, 0x450E9898,
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0xE26E1F1F, 0xF4C9B3B3, 0xB62F7474, 0x66CBF8F8, 0xCCFF9999, 0x95EA1414,
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0x03ED5858, 0x56F7DCDC, 0xD4E18B8B, 0x1C1B1515, 0x1EADA2A2, 0xD70CD3D3,
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0xFB2BE2E2, 0xC31DC8C8, 0x8E195E5E, 0xB5C22C2C, 0xE9894949, 0xCF12C1C1,
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0xBF7E9595, 0xBA207D7D, 0xEA641111, 0x77840B0B, 0x396DC5C5, 0xAF6A8989,
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0x33D17C7C, 0xC9A17171, 0x62CEFFFF, 0x7137BBBB, 0x81FB0F0F, 0x793DB5B5,
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0x0951E1E1, 0xADDC3E3E, 0x242D3F3F, 0xCDA47676, 0xF99D5555, 0xD8EE8282,
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0xE5864040, 0xC5AE7878, 0xB9CD2525, 0x4D049696, 0x44557777, 0x080A0E0E,
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0x86135050, 0xE730F7F7, 0xA1D33737, 0x1D40FAFA, 0xAA346161, 0xED8C4E4E,
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0x06B3B0B0, 0x706C5454, 0xB22A7373, 0xD2523B3B, 0x410B9F9F, 0x7B8B0202,
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0xA088D8D8, 0x114FF3F3, 0x3167CBCB, 0xC2462727, 0x27C06767, 0x90B4FCFC,
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0x20283838, 0xF67F0404, 0x60784848, 0xFF2EE5E5, 0x96074C4C, 0x5C4B6565,
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0xB1C72B2B, 0xAB6F8E8E, 0x9E0D4242, 0x9CBBF5F5, 0x52F2DBDB, 0x1BF34A4A,
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0x5FA63D3D, 0x9359A4A4, 0x0ABCB9B9, 0xEF3AF9F9, 0x91EF1313, 0x85FE0808,
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0x49019191, 0xEE611616, 0x2D7CDEDE, 0x4FB22121, 0x8F42B1B1, 0x3BDB7272,
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0x47B82F2F, 0x8748BFBF, 0x6D2CAEAE, 0x46E3C0C0, 0xD6573C3C, 0x3E859A9A,
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|
0x6929A9A9, 0x647D4F4F, 0x2A948181, 0xCE492E2E, 0xCB17C6C6, 0x2FCA6969,
|
|
0xFCC3BDBD, 0x975CA3A3, 0x055EE8E8, 0x7AD0EDED, 0xAC87D1D1, 0x7F8E0505,
|
|
0xD5BA6464, 0x1AA8A5A5, 0x4BB72626, 0x0EB9BEBE, 0xA7608787, 0x5AF8D5D5,
|
|
0x28223636, 0x14111B1B, 0x3FDE7575, 0x2979D9D9, 0x88AAEEEE, 0x3C332D2D,
|
|
0x4C5F7979, 0x02B6B7B7, 0xB896CACA, 0xDA583535, 0xB09CC4C4, 0x17FC4343,
|
|
0x551A8484, 0x1FF64D4D, 0x8A1C5959, 0x7D38B2B2, 0x57AC3333, 0xC718CFCF,
|
|
0x8DF40606, 0x74695353, 0xB7749B9B, 0xC4F59797, 0x9F56ADAD, 0x72DAE3E3,
|
|
0x7ED5EAEA, 0x154AF4F4, 0x229E8F8F, 0x12A2ABAB, 0x584E6262, 0x07E85F5F,
|
|
0x99E51D1D, 0x34392323, 0x6EC1F6F6, 0x50446C6C, 0xDE5D3232, 0x68724646,
|
|
0x6526A0A0, 0xBC93CDCD, 0xDB03DADA, 0xF8C6BABA, 0xC8FA9E9E, 0xA882D6D6,
|
|
0x2BCF6E6E, 0x40507070, 0xDCEB8585, 0xFE750A0A, 0x328A9393, 0xA48DDFDF,
|
|
0xCA4C2929, 0x10141C1C, 0x2173D7D7, 0xF0CCB4B4, 0xD309D4D4, 0x5D108A8A,
|
|
0x0FE25151, 0x00000000, 0x6F9A1919, 0x9DE01A1A, 0x368F9494, 0x42E6C7C7,
|
|
0x4AECC9C9, 0x5EFDD2D2, 0xC1AB7F7F, 0xE0D8A8A8},
|
|
|
|
{0xBC75BC32, 0xECF3EC21, 0x20C62043, 0xB3F4B3C9, 0xDADBDA03, 0x027B028B,
|
|
0xE2FBE22B, 0x9EC89EFA, 0xC94AC9EC, 0xD4D3D409, 0x18E6186B, 0x1E6B1E9F,
|
|
0x9845980E, 0xB27DB238, 0xA6E8A6D2, 0x264B26B7, 0x3CD63C57, 0x9332938A,
|
|
0x82D882EE, 0x52FD5298, 0x7B377BD4, 0xBB71BB37, 0x5BF15B97, 0x47E14783,
|
|
0x2430243C, 0x510F51E2, 0xBAF8BAC6, 0x4A1B4AF3, 0xBF87BF48, 0x0DFA0D70,
|
|
0xB006B0B3, 0x753F75DE, 0xD25ED2FD, 0x7DBA7D20, 0x66AE6631, 0x3A5B3AA3,
|
|
0x598A591C, 0x00000000, 0xCDBCCD93, 0x1A9D1AE0, 0xAE6DAE2C, 0x7FC17FAB,
|
|
0x2BB12BC7, 0xBE0EBEB9, 0xE080E0A0, 0x8A5D8A10, 0x3BD23B52, 0x64D564BA,
|
|
0xD8A0D888, 0xE784E7A5, 0x5F075FE8, 0x1B141B11, 0x2CB52CC2, 0xFC90FCB4,
|
|
0x312C3127, 0x80A38065, 0x73B2732A, 0x0C730C81, 0x794C795F, 0x6B546B41,
|
|
0x4B924B02, 0x53745369, 0x9436948F, 0x8351831F, 0x2A382A36, 0xC4B0C49C,
|
|
0x22BD22C8, 0xD55AD5F8, 0xBDFCBDC3, 0x48604878, 0xFF62FFCE, 0x4C964C07,
|
|
0x416C4177, 0xC742C7E6, 0xEBF7EB24, 0x1C101C14, 0x5D7C5D63, 0x36283622,
|
|
0x672767C0, 0xE98CE9AF, 0x441344F9, 0x149514EA, 0xF59CF5BB, 0xCFC7CF18,
|
|
0x3F243F2D, 0xC046C0E3, 0x723B72DB, 0x5470546C, 0x29CA294C, 0xF0E3F035,
|
|
0x088508FE, 0xC6CBC617, 0xF311F34F, 0x8CD08CE4, 0xA493A459, 0xCAB8CA96,
|
|
0x68A6683B, 0xB883B84D, 0x38203828, 0xE5FFE52E, 0xAD9FAD56, 0x0B770B84,
|
|
0xC8C3C81D, 0x99CC99FF, 0x580358ED, 0x196F199A, 0x0E080E0A, 0x95BF957E,
|
|
0x70407050, 0xF7E7F730, 0x6E2B6ECF, 0x1FE21F6E, 0xB579B53D, 0x090C090F,
|
|
0x61AA6134, 0x57825716, 0x9F419F0B, 0x9D3A9D80, 0x11EA1164, 0x25B925CD,
|
|
0xAFE4AFDD, 0x459A4508, 0xDFA4DF8D, 0xA397A35C, 0xEA7EEAD5, 0x35DA3558,
|
|
0xED7AEDD0, 0x431743FC, 0xF866F8CB, 0xFB94FBB1, 0x37A137D3, 0xFA1DFA40,
|
|
0xC23DC268, 0xB4F0B4CC, 0x32DE325D, 0x9CB39C71, 0x560B56E7, 0xE372E3DA,
|
|
0x87A78760, 0x151C151B, 0xF9EFF93A, 0x63D163BF, 0x345334A9, 0x9A3E9A85,
|
|
0xB18FB142, 0x7C337CD1, 0x8826889B, 0x3D5F3DA6, 0xA1ECA1D7, 0xE476E4DF,
|
|
0x812A8194, 0x91499101, 0x0F810FFB, 0xEE88EEAA, 0x16EE1661, 0xD721D773,
|
|
0x97C497F5, 0xA51AA5A8, 0xFEEBFE3F, 0x6DD96DB5, 0x78C578AE, 0xC539C56D,
|
|
0x1D991DE5, 0x76CD76A4, 0x3EAD3EDC, 0xCB31CB67, 0xB68BB647, 0xEF01EF5B,
|
|
0x1218121E, 0x602360C5, 0x6ADD6AB0, 0x4D1F4DF6, 0xCE4ECEE9, 0xDE2DDE7C,
|
|
0x55F9559D, 0x7E487E5A, 0x214F21B2, 0x03F2037A, 0xA065A026, 0x5E8E5E19,
|
|
0x5A785A66, 0x655C654B, 0x6258624E, 0xFD19FD45, 0x068D06F4, 0x40E54086,
|
|
0xF298F2BE, 0x335733AC, 0x17671790, 0x057F058E, 0xE805E85E, 0x4F644F7D,
|
|
0x89AF896A, 0x10631095, 0x74B6742F, 0x0AFE0A75, 0x5CF55C92, 0x9BB79B74,
|
|
0x2D3C2D33, 0x30A530D6, 0x2ECE2E49, 0x49E94989, 0x46684672, 0x77447755,
|
|
0xA8E0A8D8, 0x964D9604, 0x284328BD, 0xA969A929, 0xD929D979, 0x862E8691,
|
|
0xD1ACD187, 0xF415F44A, 0x8D598D15, 0xD6A8D682, 0xB90AB9BC, 0x429E420D,
|
|
0xF66EF6C1, 0x2F472FB8, 0xDDDFDD06, 0x23342339, 0xCC35CC62, 0xF16AF1C4,
|
|
0xC1CFC112, 0x85DC85EB, 0x8F228F9E, 0x71C971A1, 0x90C090F0, 0xAA9BAA53,
|
|
0x018901F1, 0x8BD48BE1, 0x4EED4E8C, 0x8EAB8E6F, 0xAB12ABA2, 0x6FA26F3E,
|
|
0xE60DE654, 0xDB52DBF2, 0x92BB927B, 0xB702B7B6, 0x692F69CA, 0x39A939D9,
|
|
0xD3D7D30C, 0xA761A723, 0xA21EA2AD, 0xC3B4C399, 0x6C506C44, 0x07040705,
|
|
0x04F6047F, 0x27C22746, 0xAC16ACA7, 0xD025D076, 0x50865013, 0xDC56DCF7,
|
|
0x8455841A, 0xE109E151, 0x7ABE7A25, 0x139113EF},
|
|
|
|
{0xD939A9D9, 0x90176790, 0x719CB371, 0xD2A6E8D2, 0x05070405, 0x9852FD98,
|
|
0x6580A365, 0xDFE476DF, 0x08459A08, 0x024B9202, 0xA0E080A0, 0x665A7866,
|
|
0xDDAFE4DD, 0xB06ADDB0, 0xBF63D1BF, 0x362A3836, 0x54E60D54, 0x4320C643,
|
|
0x62CC3562, 0xBEF298BE, 0x1E12181E, 0x24EBF724, 0xD7A1ECD7, 0x77416C77,
|
|
0xBD2843BD, 0x32BC7532, 0xD47B37D4, 0x9B88269B, 0x700DFA70, 0xF94413F9,
|
|
0xB1FB94B1, 0x5A7E485A, 0x7A03F27A, 0xE48CD0E4, 0x47B68B47, 0x3C24303C,
|
|
0xA5E784A5, 0x416B5441, 0x06DDDF06, 0xC56023C5, 0x45FD1945, 0xA33A5BA3,
|
|
0x68C23D68, 0x158D5915, 0x21ECF321, 0x3166AE31, 0x3E6FA23E, 0x16578216,
|
|
0x95106395, 0x5BEF015B, 0x4DB8834D, 0x91862E91, 0xB56DD9B5, 0x1F83511F,
|
|
0x53AA9B53, 0x635D7C63, 0x3B68A63B, 0x3FFEEB3F, 0xD630A5D6, 0x257ABE25,
|
|
0xA7AC16A7, 0x0F090C0F, 0x35F0E335, 0x23A76123, 0xF090C0F0, 0xAFE98CAF,
|
|
0x809D3A80, 0x925CF592, 0x810C7381, 0x27312C27, 0x76D02576, 0xE7560BE7,
|
|
0x7B92BB7B, 0xE9CE4EE9, 0xF10189F1, 0x9F1E6B9F, 0xA93453A9, 0xC4F16AC4,
|
|
0x99C3B499, 0x975BF197, 0x8347E183, 0x6B18E66B, 0xC822BDC8, 0x0E98450E,
|
|
0x6E1FE26E, 0xC9B3F4C9, 0x2F74B62F, 0xCBF866CB, 0xFF99CCFF, 0xEA1495EA,
|
|
0xED5803ED, 0xF7DC56F7, 0xE18BD4E1, 0x1B151C1B, 0xADA21EAD, 0x0CD3D70C,
|
|
0x2BE2FB2B, 0x1DC8C31D, 0x195E8E19, 0xC22CB5C2, 0x8949E989, 0x12C1CF12,
|
|
0x7E95BF7E, 0x207DBA20, 0x6411EA64, 0x840B7784, 0x6DC5396D, 0x6A89AF6A,
|
|
0xD17C33D1, 0xA171C9A1, 0xCEFF62CE, 0x37BB7137, 0xFB0F81FB, 0x3DB5793D,
|
|
0x51E10951, 0xDC3EADDC, 0x2D3F242D, 0xA476CDA4, 0x9D55F99D, 0xEE82D8EE,
|
|
0x8640E586, 0xAE78C5AE, 0xCD25B9CD, 0x04964D04, 0x55774455, 0x0A0E080A,
|
|
0x13508613, 0x30F7E730, 0xD337A1D3, 0x40FA1D40, 0x3461AA34, 0x8C4EED8C,
|
|
0xB3B006B3, 0x6C54706C, 0x2A73B22A, 0x523BD252, 0x0B9F410B, 0x8B027B8B,
|
|
0x88D8A088, 0x4FF3114F, 0x67CB3167, 0x4627C246, 0xC06727C0, 0xB4FC90B4,
|
|
0x28382028, 0x7F04F67F, 0x78486078, 0x2EE5FF2E, 0x074C9607, 0x4B655C4B,
|
|
0xC72BB1C7, 0x6F8EAB6F, 0x0D429E0D, 0xBBF59CBB, 0xF2DB52F2, 0xF34A1BF3,
|
|
0xA63D5FA6, 0x59A49359, 0xBCB90ABC, 0x3AF9EF3A, 0xEF1391EF, 0xFE0885FE,
|
|
0x01914901, 0x6116EE61, 0x7CDE2D7C, 0xB2214FB2, 0x42B18F42, 0xDB723BDB,
|
|
0xB82F47B8, 0x48BF8748, 0x2CAE6D2C, 0xE3C046E3, 0x573CD657, 0x859A3E85,
|
|
0x29A96929, 0x7D4F647D, 0x94812A94, 0x492ECE49, 0x17C6CB17, 0xCA692FCA,
|
|
0xC3BDFCC3, 0x5CA3975C, 0x5EE8055E, 0xD0ED7AD0, 0x87D1AC87, 0x8E057F8E,
|
|
0xBA64D5BA, 0xA8A51AA8, 0xB7264BB7, 0xB9BE0EB9, 0x6087A760, 0xF8D55AF8,
|
|
0x22362822, 0x111B1411, 0xDE753FDE, 0x79D92979, 0xAAEE88AA, 0x332D3C33,
|
|
0x5F794C5F, 0xB6B702B6, 0x96CAB896, 0x5835DA58, 0x9CC4B09C, 0xFC4317FC,
|
|
0x1A84551A, 0xF64D1FF6, 0x1C598A1C, 0x38B27D38, 0xAC3357AC, 0x18CFC718,
|
|
0xF4068DF4, 0x69537469, 0x749BB774, 0xF597C4F5, 0x56AD9F56, 0xDAE372DA,
|
|
0xD5EA7ED5, 0x4AF4154A, 0x9E8F229E, 0xA2AB12A2, 0x4E62584E, 0xE85F07E8,
|
|
0xE51D99E5, 0x39233439, 0xC1F66EC1, 0x446C5044, 0x5D32DE5D, 0x72466872,
|
|
0x26A06526, 0x93CDBC93, 0x03DADB03, 0xC6BAF8C6, 0xFA9EC8FA, 0x82D6A882,
|
|
0xCF6E2BCF, 0x50704050, 0xEB85DCEB, 0x750AFE75, 0x8A93328A, 0x8DDFA48D,
|
|
0x4C29CA4C, 0x141C1014, 0x73D72173, 0xCCB4F0CC, 0x09D4D309, 0x108A5D10,
|
|
0xE2510FE2, 0x00000000, 0x9A196F9A, 0xE01A9DE0, 0x8F94368F, 0xE6C742E6,
|
|
0xECC94AEC, 0xFDD25EFD, 0xAB7FC1AB, 0xD8A8E0D8}
|
|
};
|
|
|
|
/* The exp_to_poly and poly_to_exp tables are used to perform efficient
|
|
* operations in GF(2^8) represented as GF(2)[x]/w(x) where
|
|
* w(x)=x^8+x^6+x^3+x^2+1. We care about doing that because it's part of the
|
|
* definition of the RS matrix in the key schedule. Elements of that field
|
|
* are polynomials of degree not greater than 7 and all coefficients 0 or 1,
|
|
* which can be represented naturally by bytes (just substitute x=2). In that
|
|
* form, GF(2^8) addition is the same as bitwise XOR, but GF(2^8)
|
|
* multiplication is inefficient without hardware support. To multiply
|
|
* faster, I make use of the fact x is a generator for the nonzero elements,
|
|
* so that every element p of GF(2)[x]/w(x) is either 0 or equal to (x)^n for
|
|
* some n in 0..254. Note that that caret is exponentiation in GF(2^8),
|
|
* *not* polynomial notation. So if I want to compute pq where p and q are
|
|
* in GF(2^8), I can just say:
|
|
* 1. if p=0 or q=0 then pq=0
|
|
* 2. otherwise, find m and n such that p=x^m and q=x^n
|
|
* 3. pq=(x^m)(x^n)=x^(m+n), so add m and n and find pq
|
|
* The translations in steps 2 and 3 are looked up in the tables
|
|
* poly_to_exp (for step 2) and exp_to_poly (for step 3). To see this
|
|
* in action, look at the CALC_S macro. As additional wrinkles, note that
|
|
* one of my operands is always a constant, so the poly_to_exp lookup on it
|
|
* is done in advance; I included the original values in the comments so
|
|
* readers can have some chance of recognizing that this *is* the RS matrix
|
|
* from the Twofish paper. I've only included the table entries I actually
|
|
* need; I never do a lookup on a variable input of zero and the biggest
|
|
* exponents I'll ever see are 254 (variable) and 237 (constant), so they'll
|
|
* never sum to more than 491. I'm repeating part of the exp_to_poly table
|
|
* so that I don't have to do mod-255 reduction in the exponent arithmetic.
|
|
* Since I know my constant operands are never zero, I only have to worry
|
|
* about zero values in the variable operand, and I do it with a simple
|
|
* conditional branch. I know conditionals are expensive, but I couldn't
|
|
* see a non-horrible way of avoiding them, and I did manage to group the
|
|
* statements so that each if covers four group multiplications. */
|
|
|
|
static const u8 poly_to_exp[255] = {
|
|
0x00, 0x01, 0x17, 0x02, 0x2E, 0x18, 0x53, 0x03, 0x6A, 0x2F, 0x93, 0x19,
|
|
0x34, 0x54, 0x45, 0x04, 0x5C, 0x6B, 0xB6, 0x30, 0xA6, 0x94, 0x4B, 0x1A,
|
|
0x8C, 0x35, 0x81, 0x55, 0xAA, 0x46, 0x0D, 0x05, 0x24, 0x5D, 0x87, 0x6C,
|
|
0x9B, 0xB7, 0xC1, 0x31, 0x2B, 0xA7, 0xA3, 0x95, 0x98, 0x4C, 0xCA, 0x1B,
|
|
0xE6, 0x8D, 0x73, 0x36, 0xCD, 0x82, 0x12, 0x56, 0x62, 0xAB, 0xF0, 0x47,
|
|
0x4F, 0x0E, 0xBD, 0x06, 0xD4, 0x25, 0xD2, 0x5E, 0x27, 0x88, 0x66, 0x6D,
|
|
0xD6, 0x9C, 0x79, 0xB8, 0x08, 0xC2, 0xDF, 0x32, 0x68, 0x2C, 0xFD, 0xA8,
|
|
0x8A, 0xA4, 0x5A, 0x96, 0x29, 0x99, 0x22, 0x4D, 0x60, 0xCB, 0xE4, 0x1C,
|
|
0x7B, 0xE7, 0x3B, 0x8E, 0x9E, 0x74, 0xF4, 0x37, 0xD8, 0xCE, 0xF9, 0x83,
|
|
0x6F, 0x13, 0xB2, 0x57, 0xE1, 0x63, 0xDC, 0xAC, 0xC4, 0xF1, 0xAF, 0x48,
|
|
0x0A, 0x50, 0x42, 0x0F, 0xBA, 0xBE, 0xC7, 0x07, 0xDE, 0xD5, 0x78, 0x26,
|
|
0x65, 0xD3, 0xD1, 0x5F, 0xE3, 0x28, 0x21, 0x89, 0x59, 0x67, 0xFC, 0x6E,
|
|
0xB1, 0xD7, 0xF8, 0x9D, 0xF3, 0x7A, 0x3A, 0xB9, 0xC6, 0x09, 0x41, 0xC3,
|
|
0xAE, 0xE0, 0xDB, 0x33, 0x44, 0x69, 0x92, 0x2D, 0x52, 0xFE, 0x16, 0xA9,
|
|
0x0C, 0x8B, 0x80, 0xA5, 0x4A, 0x5B, 0xB5, 0x97, 0xC9, 0x2A, 0xA2, 0x9A,
|
|
0xC0, 0x23, 0x86, 0x4E, 0xBC, 0x61, 0xEF, 0xCC, 0x11, 0xE5, 0x72, 0x1D,
|
|
0x3D, 0x7C, 0xEB, 0xE8, 0xE9, 0x3C, 0xEA, 0x8F, 0x7D, 0x9F, 0xEC, 0x75,
|
|
0x1E, 0xF5, 0x3E, 0x38, 0xF6, 0xD9, 0x3F, 0xCF, 0x76, 0xFA, 0x1F, 0x84,
|
|
0xA0, 0x70, 0xED, 0x14, 0x90, 0xB3, 0x7E, 0x58, 0xFB, 0xE2, 0x20, 0x64,
|
|
0xD0, 0xDD, 0x77, 0xAD, 0xDA, 0xC5, 0x40, 0xF2, 0x39, 0xB0, 0xF7, 0x49,
|
|
0xB4, 0x0B, 0x7F, 0x51, 0x15, 0x43, 0x91, 0x10, 0x71, 0xBB, 0xEE, 0xBF,
|
|
0x85, 0xC8, 0xA1
|
|
};
|
|
|
|
static const u8 exp_to_poly[492] = {
|
|
0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x4D, 0x9A, 0x79, 0xF2,
|
|
0xA9, 0x1F, 0x3E, 0x7C, 0xF8, 0xBD, 0x37, 0x6E, 0xDC, 0xF5, 0xA7, 0x03,
|
|
0x06, 0x0C, 0x18, 0x30, 0x60, 0xC0, 0xCD, 0xD7, 0xE3, 0x8B, 0x5B, 0xB6,
|
|
0x21, 0x42, 0x84, 0x45, 0x8A, 0x59, 0xB2, 0x29, 0x52, 0xA4, 0x05, 0x0A,
|
|
0x14, 0x28, 0x50, 0xA0, 0x0D, 0x1A, 0x34, 0x68, 0xD0, 0xED, 0x97, 0x63,
|
|
0xC6, 0xC1, 0xCF, 0xD3, 0xEB, 0x9B, 0x7B, 0xF6, 0xA1, 0x0F, 0x1E, 0x3C,
|
|
0x78, 0xF0, 0xAD, 0x17, 0x2E, 0x5C, 0xB8, 0x3D, 0x7A, 0xF4, 0xA5, 0x07,
|
|
0x0E, 0x1C, 0x38, 0x70, 0xE0, 0x8D, 0x57, 0xAE, 0x11, 0x22, 0x44, 0x88,
|
|
0x5D, 0xBA, 0x39, 0x72, 0xE4, 0x85, 0x47, 0x8E, 0x51, 0xA2, 0x09, 0x12,
|
|
0x24, 0x48, 0x90, 0x6D, 0xDA, 0xF9, 0xBF, 0x33, 0x66, 0xCC, 0xD5, 0xE7,
|
|
0x83, 0x4B, 0x96, 0x61, 0xC2, 0xC9, 0xDF, 0xF3, 0xAB, 0x1B, 0x36, 0x6C,
|
|
0xD8, 0xFD, 0xB7, 0x23, 0x46, 0x8C, 0x55, 0xAA, 0x19, 0x32, 0x64, 0xC8,
|
|
0xDD, 0xF7, 0xA3, 0x0B, 0x16, 0x2C, 0x58, 0xB0, 0x2D, 0x5A, 0xB4, 0x25,
|
|
0x4A, 0x94, 0x65, 0xCA, 0xD9, 0xFF, 0xB3, 0x2B, 0x56, 0xAC, 0x15, 0x2A,
|
|
0x54, 0xA8, 0x1D, 0x3A, 0x74, 0xE8, 0x9D, 0x77, 0xEE, 0x91, 0x6F, 0xDE,
|
|
0xF1, 0xAF, 0x13, 0x26, 0x4C, 0x98, 0x7D, 0xFA, 0xB9, 0x3F, 0x7E, 0xFC,
|
|
0xB5, 0x27, 0x4E, 0x9C, 0x75, 0xEA, 0x99, 0x7F, 0xFE, 0xB1, 0x2F, 0x5E,
|
|
0xBC, 0x35, 0x6A, 0xD4, 0xE5, 0x87, 0x43, 0x86, 0x41, 0x82, 0x49, 0x92,
|
|
0x69, 0xD2, 0xE9, 0x9F, 0x73, 0xE6, 0x81, 0x4F, 0x9E, 0x71, 0xE2, 0x89,
|
|
0x5F, 0xBE, 0x31, 0x62, 0xC4, 0xC5, 0xC7, 0xC3, 0xCB, 0xDB, 0xFB, 0xBB,
|
|
0x3B, 0x76, 0xEC, 0x95, 0x67, 0xCE, 0xD1, 0xEF, 0x93, 0x6B, 0xD6, 0xE1,
|
|
0x8F, 0x53, 0xA6, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x4D,
|
|
0x9A, 0x79, 0xF2, 0xA9, 0x1F, 0x3E, 0x7C, 0xF8, 0xBD, 0x37, 0x6E, 0xDC,
|
|
0xF5, 0xA7, 0x03, 0x06, 0x0C, 0x18, 0x30, 0x60, 0xC0, 0xCD, 0xD7, 0xE3,
|
|
0x8B, 0x5B, 0xB6, 0x21, 0x42, 0x84, 0x45, 0x8A, 0x59, 0xB2, 0x29, 0x52,
|
|
0xA4, 0x05, 0x0A, 0x14, 0x28, 0x50, 0xA0, 0x0D, 0x1A, 0x34, 0x68, 0xD0,
|
|
0xED, 0x97, 0x63, 0xC6, 0xC1, 0xCF, 0xD3, 0xEB, 0x9B, 0x7B, 0xF6, 0xA1,
|
|
0x0F, 0x1E, 0x3C, 0x78, 0xF0, 0xAD, 0x17, 0x2E, 0x5C, 0xB8, 0x3D, 0x7A,
|
|
0xF4, 0xA5, 0x07, 0x0E, 0x1C, 0x38, 0x70, 0xE0, 0x8D, 0x57, 0xAE, 0x11,
|
|
0x22, 0x44, 0x88, 0x5D, 0xBA, 0x39, 0x72, 0xE4, 0x85, 0x47, 0x8E, 0x51,
|
|
0xA2, 0x09, 0x12, 0x24, 0x48, 0x90, 0x6D, 0xDA, 0xF9, 0xBF, 0x33, 0x66,
|
|
0xCC, 0xD5, 0xE7, 0x83, 0x4B, 0x96, 0x61, 0xC2, 0xC9, 0xDF, 0xF3, 0xAB,
|
|
0x1B, 0x36, 0x6C, 0xD8, 0xFD, 0xB7, 0x23, 0x46, 0x8C, 0x55, 0xAA, 0x19,
|
|
0x32, 0x64, 0xC8, 0xDD, 0xF7, 0xA3, 0x0B, 0x16, 0x2C, 0x58, 0xB0, 0x2D,
|
|
0x5A, 0xB4, 0x25, 0x4A, 0x94, 0x65, 0xCA, 0xD9, 0xFF, 0xB3, 0x2B, 0x56,
|
|
0xAC, 0x15, 0x2A, 0x54, 0xA8, 0x1D, 0x3A, 0x74, 0xE8, 0x9D, 0x77, 0xEE,
|
|
0x91, 0x6F, 0xDE, 0xF1, 0xAF, 0x13, 0x26, 0x4C, 0x98, 0x7D, 0xFA, 0xB9,
|
|
0x3F, 0x7E, 0xFC, 0xB5, 0x27, 0x4E, 0x9C, 0x75, 0xEA, 0x99, 0x7F, 0xFE,
|
|
0xB1, 0x2F, 0x5E, 0xBC, 0x35, 0x6A, 0xD4, 0xE5, 0x87, 0x43, 0x86, 0x41,
|
|
0x82, 0x49, 0x92, 0x69, 0xD2, 0xE9, 0x9F, 0x73, 0xE6, 0x81, 0x4F, 0x9E,
|
|
0x71, 0xE2, 0x89, 0x5F, 0xBE, 0x31, 0x62, 0xC4, 0xC5, 0xC7, 0xC3, 0xCB
|
|
};
|
|
|
|
|
|
/* The table constants are indices of
|
|
* S-box entries, preprocessed through q0 and q1. */
|
|
static const u8 calc_sb_tbl[512] = {
|
|
0xA9, 0x75, 0x67, 0xF3, 0xB3, 0xC6, 0xE8, 0xF4,
|
|
0x04, 0xDB, 0xFD, 0x7B, 0xA3, 0xFB, 0x76, 0xC8,
|
|
0x9A, 0x4A, 0x92, 0xD3, 0x80, 0xE6, 0x78, 0x6B,
|
|
0xE4, 0x45, 0xDD, 0x7D, 0xD1, 0xE8, 0x38, 0x4B,
|
|
0x0D, 0xD6, 0xC6, 0x32, 0x35, 0xD8, 0x98, 0xFD,
|
|
0x18, 0x37, 0xF7, 0x71, 0xEC, 0xF1, 0x6C, 0xE1,
|
|
0x43, 0x30, 0x75, 0x0F, 0x37, 0xF8, 0x26, 0x1B,
|
|
0xFA, 0x87, 0x13, 0xFA, 0x94, 0x06, 0x48, 0x3F,
|
|
0xF2, 0x5E, 0xD0, 0xBA, 0x8B, 0xAE, 0x30, 0x5B,
|
|
0x84, 0x8A, 0x54, 0x00, 0xDF, 0xBC, 0x23, 0x9D,
|
|
0x19, 0x6D, 0x5B, 0xC1, 0x3D, 0xB1, 0x59, 0x0E,
|
|
0xF3, 0x80, 0xAE, 0x5D, 0xA2, 0xD2, 0x82, 0xD5,
|
|
0x63, 0xA0, 0x01, 0x84, 0x83, 0x07, 0x2E, 0x14,
|
|
0xD9, 0xB5, 0x51, 0x90, 0x9B, 0x2C, 0x7C, 0xA3,
|
|
0xA6, 0xB2, 0xEB, 0x73, 0xA5, 0x4C, 0xBE, 0x54,
|
|
0x16, 0x92, 0x0C, 0x74, 0xE3, 0x36, 0x61, 0x51,
|
|
0xC0, 0x38, 0x8C, 0xB0, 0x3A, 0xBD, 0xF5, 0x5A,
|
|
0x73, 0xFC, 0x2C, 0x60, 0x25, 0x62, 0x0B, 0x96,
|
|
0xBB, 0x6C, 0x4E, 0x42, 0x89, 0xF7, 0x6B, 0x10,
|
|
0x53, 0x7C, 0x6A, 0x28, 0xB4, 0x27, 0xF1, 0x8C,
|
|
0xE1, 0x13, 0xE6, 0x95, 0xBD, 0x9C, 0x45, 0xC7,
|
|
0xE2, 0x24, 0xF4, 0x46, 0xB6, 0x3B, 0x66, 0x70,
|
|
0xCC, 0xCA, 0x95, 0xE3, 0x03, 0x85, 0x56, 0xCB,
|
|
0xD4, 0x11, 0x1C, 0xD0, 0x1E, 0x93, 0xD7, 0xB8,
|
|
0xFB, 0xA6, 0xC3, 0x83, 0x8E, 0x20, 0xB5, 0xFF,
|
|
0xE9, 0x9F, 0xCF, 0x77, 0xBF, 0xC3, 0xBA, 0xCC,
|
|
0xEA, 0x03, 0x77, 0x6F, 0x39, 0x08, 0xAF, 0xBF,
|
|
0x33, 0x40, 0xC9, 0xE7, 0x62, 0x2B, 0x71, 0xE2,
|
|
0x81, 0x79, 0x79, 0x0C, 0x09, 0xAA, 0xAD, 0x82,
|
|
0x24, 0x41, 0xCD, 0x3A, 0xF9, 0xEA, 0xD8, 0xB9,
|
|
0xE5, 0xE4, 0xC5, 0x9A, 0xB9, 0xA4, 0x4D, 0x97,
|
|
0x44, 0x7E, 0x08, 0xDA, 0x86, 0x7A, 0xE7, 0x17,
|
|
0xA1, 0x66, 0x1D, 0x94, 0xAA, 0xA1, 0xED, 0x1D,
|
|
0x06, 0x3D, 0x70, 0xF0, 0xB2, 0xDE, 0xD2, 0xB3,
|
|
0x41, 0x0B, 0x7B, 0x72, 0xA0, 0xA7, 0x11, 0x1C,
|
|
0x31, 0xEF, 0xC2, 0xD1, 0x27, 0x53, 0x90, 0x3E,
|
|
0x20, 0x8F, 0xF6, 0x33, 0x60, 0x26, 0xFF, 0x5F,
|
|
0x96, 0xEC, 0x5C, 0x76, 0xB1, 0x2A, 0xAB, 0x49,
|
|
0x9E, 0x81, 0x9C, 0x88, 0x52, 0xEE, 0x1B, 0x21,
|
|
0x5F, 0xC4, 0x93, 0x1A, 0x0A, 0xEB, 0xEF, 0xD9,
|
|
0x91, 0xC5, 0x85, 0x39, 0x49, 0x99, 0xEE, 0xCD,
|
|
0x2D, 0xAD, 0x4F, 0x31, 0x8F, 0x8B, 0x3B, 0x01,
|
|
0x47, 0x18, 0x87, 0x23, 0x6D, 0xDD, 0x46, 0x1F,
|
|
0xD6, 0x4E, 0x3E, 0x2D, 0x69, 0xF9, 0x64, 0x48,
|
|
0x2A, 0x4F, 0xCE, 0xF2, 0xCB, 0x65, 0x2F, 0x8E,
|
|
0xFC, 0x78, 0x97, 0x5C, 0x05, 0x58, 0x7A, 0x19,
|
|
0xAC, 0x8D, 0x7F, 0xE5, 0xD5, 0x98, 0x1A, 0x57,
|
|
0x4B, 0x67, 0x0E, 0x7F, 0xA7, 0x05, 0x5A, 0x64,
|
|
0x28, 0xAF, 0x14, 0x63, 0x3F, 0xB6, 0x29, 0xFE,
|
|
0x88, 0xF5, 0x3C, 0xB7, 0x4C, 0x3C, 0x02, 0xA5,
|
|
0xB8, 0xCE, 0xDA, 0xE9, 0xB0, 0x68, 0x17, 0x44,
|
|
0x55, 0xE0, 0x1F, 0x4D, 0x8A, 0x43, 0x7D, 0x69,
|
|
0x57, 0x29, 0xC7, 0x2E, 0x8D, 0xAC, 0x74, 0x15,
|
|
0xB7, 0x59, 0xC4, 0xA8, 0x9F, 0x0A, 0x72, 0x9E,
|
|
0x7E, 0x6E, 0x15, 0x47, 0x22, 0xDF, 0x12, 0x34,
|
|
0x58, 0x35, 0x07, 0x6A, 0x99, 0xCF, 0x34, 0xDC,
|
|
0x6E, 0x22, 0x50, 0xC9, 0xDE, 0xC0, 0x68, 0x9B,
|
|
0x65, 0x89, 0xBC, 0xD4, 0xDB, 0xED, 0xF8, 0xAB,
|
|
0xC8, 0x12, 0xA8, 0xA2, 0x2B, 0x0D, 0x40, 0x52,
|
|
0xDC, 0xBB, 0xFE, 0x02, 0x32, 0x2F, 0xA4, 0xA9,
|
|
0xCA, 0xD7, 0x10, 0x61, 0x21, 0x1E, 0xF0, 0xB4,
|
|
0xD3, 0x50, 0x5D, 0x04, 0x0F, 0xF6, 0x00, 0xC2,
|
|
0x6F, 0x16, 0x9D, 0x25, 0x36, 0x86, 0x42, 0x56,
|
|
0x4A, 0x55, 0x5E, 0x09, 0xC1, 0xBE, 0xE0, 0x91
|
|
};
|
|
|
|
/* Macro to perform one column of the RS matrix multiplication. The
|
|
* parameters a, b, c, and d are the four bytes of output; i is the index
|
|
* of the key bytes, and w, x, y, and z, are the column of constants from
|
|
* the RS matrix, preprocessed through the poly_to_exp table. */
|
|
|
|
#define CALC_S(a, b, c, d, i, w, x, y, z) \
|
|
if (key[i]) { \
|
|
tmp = poly_to_exp[key[i] - 1]; \
|
|
(a) ^= exp_to_poly[tmp + (w)]; \
|
|
(b) ^= exp_to_poly[tmp + (x)]; \
|
|
(c) ^= exp_to_poly[tmp + (y)]; \
|
|
(d) ^= exp_to_poly[tmp + (z)]; \
|
|
}
|
|
|
|
/* Macros to calculate the key-dependent S-boxes for a 128-bit key using
|
|
* the S vector from CALC_S. CALC_SB_2 computes a single entry in all
|
|
* four S-boxes, where i is the index of the entry to compute, and a and b
|
|
* are the index numbers preprocessed through the q0 and q1 tables
|
|
* respectively. */
|
|
|
|
#define CALC_SB_2(i, a, b) \
|
|
ctx->s[0][i] = mds[0][q0[(a) ^ sa] ^ se]; \
|
|
ctx->s[1][i] = mds[1][q0[(b) ^ sb] ^ sf]; \
|
|
ctx->s[2][i] = mds[2][q1[(a) ^ sc] ^ sg]; \
|
|
ctx->s[3][i] = mds[3][q1[(b) ^ sd] ^ sh]
|
|
|
|
/* Macro exactly like CALC_SB_2, but for 192-bit keys. */
|
|
|
|
#define CALC_SB192_2(i, a, b) \
|
|
ctx->s[0][i] = mds[0][q0[q0[(b) ^ sa] ^ se] ^ si]; \
|
|
ctx->s[1][i] = mds[1][q0[q1[(b) ^ sb] ^ sf] ^ sj]; \
|
|
ctx->s[2][i] = mds[2][q1[q0[(a) ^ sc] ^ sg] ^ sk]; \
|
|
ctx->s[3][i] = mds[3][q1[q1[(a) ^ sd] ^ sh] ^ sl];
|
|
|
|
/* Macro exactly like CALC_SB_2, but for 256-bit keys. */
|
|
|
|
#define CALC_SB256_2(i, a, b) \
|
|
ctx->s[0][i] = mds[0][q0[q0[q1[(b) ^ sa] ^ se] ^ si] ^ sm]; \
|
|
ctx->s[1][i] = mds[1][q0[q1[q1[(a) ^ sb] ^ sf] ^ sj] ^ sn]; \
|
|
ctx->s[2][i] = mds[2][q1[q0[q0[(a) ^ sc] ^ sg] ^ sk] ^ so]; \
|
|
ctx->s[3][i] = mds[3][q1[q1[q0[(b) ^ sd] ^ sh] ^ sl] ^ sp];
|
|
|
|
/* Macros to calculate the whitening and round subkeys. CALC_K_2 computes the
|
|
* last two stages of the h() function for a given index (either 2i or 2i+1).
|
|
* a, b, c, and d are the four bytes going into the last two stages. For
|
|
* 128-bit keys, this is the entire h() function and a and c are the index
|
|
* preprocessed through q0 and q1 respectively; for longer keys they are the
|
|
* output of previous stages. j is the index of the first key byte to use.
|
|
* CALC_K computes a pair of subkeys for 128-bit Twofish, by calling CALC_K_2
|
|
* twice, doing the Pseudo-Hadamard Transform, and doing the necessary
|
|
* rotations. Its parameters are: a, the array to write the results into,
|
|
* j, the index of the first output entry, k and l, the preprocessed indices
|
|
* for index 2i, and m and n, the preprocessed indices for index 2i+1.
|
|
* CALC_K192_2 expands CALC_K_2 to handle 192-bit keys, by doing an
|
|
* additional lookup-and-XOR stage. The parameters a, b, c and d are the
|
|
* four bytes going into the last three stages. For 192-bit keys, c = d
|
|
* are the index preprocessed through q0, and a = b are the index
|
|
* preprocessed through q1; j is the index of the first key byte to use.
|
|
* CALC_K192 is identical to CALC_K but for using the CALC_K192_2 macro
|
|
* instead of CALC_K_2.
|
|
* CALC_K256_2 expands CALC_K192_2 to handle 256-bit keys, by doing an
|
|
* additional lookup-and-XOR stage. The parameters a and b are the index
|
|
* preprocessed through q0 and q1 respectively; j is the index of the first
|
|
* key byte to use. CALC_K256 is identical to CALC_K but for using the
|
|
* CALC_K256_2 macro instead of CALC_K_2. */
|
|
|
|
#define CALC_K_2(a, b, c, d, j) \
|
|
mds[0][q0[a ^ key[(j) + 8]] ^ key[j]] \
|
|
^ mds[1][q0[b ^ key[(j) + 9]] ^ key[(j) + 1]] \
|
|
^ mds[2][q1[c ^ key[(j) + 10]] ^ key[(j) + 2]] \
|
|
^ mds[3][q1[d ^ key[(j) + 11]] ^ key[(j) + 3]]
|
|
|
|
#define CALC_K(a, j, k, l, m, n) \
|
|
x = CALC_K_2 (k, l, k, l, 0); \
|
|
y = CALC_K_2 (m, n, m, n, 4); \
|
|
y = rol32(y, 8); \
|
|
x += y; y += x; ctx->a[j] = x; \
|
|
ctx->a[(j) + 1] = rol32(y, 9)
|
|
|
|
#define CALC_K192_2(a, b, c, d, j) \
|
|
CALC_K_2 (q0[a ^ key[(j) + 16]], \
|
|
q1[b ^ key[(j) + 17]], \
|
|
q0[c ^ key[(j) + 18]], \
|
|
q1[d ^ key[(j) + 19]], j)
|
|
|
|
#define CALC_K192(a, j, k, l, m, n) \
|
|
x = CALC_K192_2 (l, l, k, k, 0); \
|
|
y = CALC_K192_2 (n, n, m, m, 4); \
|
|
y = rol32(y, 8); \
|
|
x += y; y += x; ctx->a[j] = x; \
|
|
ctx->a[(j) + 1] = rol32(y, 9)
|
|
|
|
#define CALC_K256_2(a, b, j) \
|
|
CALC_K192_2 (q1[b ^ key[(j) + 24]], \
|
|
q1[a ^ key[(j) + 25]], \
|
|
q0[a ^ key[(j) + 26]], \
|
|
q0[b ^ key[(j) + 27]], j)
|
|
|
|
#define CALC_K256(a, j, k, l, m, n) \
|
|
x = CALC_K256_2 (k, l, 0); \
|
|
y = CALC_K256_2 (m, n, 4); \
|
|
y = rol32(y, 8); \
|
|
x += y; y += x; ctx->a[j] = x; \
|
|
ctx->a[(j) + 1] = rol32(y, 9)
|
|
|
|
|
|
/* Macros to compute the g() function in the encryption and decryption
|
|
* rounds. G1 is the straight g() function; G2 includes the 8-bit
|
|
* rotation for the high 32-bit word. */
|
|
|
|
#define G1(a) \
|
|
(ctx->s[0][(a) & 0xFF]) ^ (ctx->s[1][((a) >> 8) & 0xFF]) \
|
|
^ (ctx->s[2][((a) >> 16) & 0xFF]) ^ (ctx->s[3][(a) >> 24])
|
|
|
|
#define G2(b) \
|
|
(ctx->s[1][(b) & 0xFF]) ^ (ctx->s[2][((b) >> 8) & 0xFF]) \
|
|
^ (ctx->s[3][((b) >> 16) & 0xFF]) ^ (ctx->s[0][(b) >> 24])
|
|
|
|
/* Encryption and decryption Feistel rounds. Each one calls the two g()
|
|
* macros, does the PHT, and performs the XOR and the appropriate bit
|
|
* rotations. The parameters are the round number (used to select subkeys),
|
|
* and the four 32-bit chunks of the text. */
|
|
|
|
#define ENCROUND(n, a, b, c, d) \
|
|
x = G1 (a); y = G2 (b); \
|
|
x += y; y += x + ctx->k[2 * (n) + 1]; \
|
|
(c) ^= x + ctx->k[2 * (n)]; \
|
|
(c) = ror32((c), 1); \
|
|
(d) = rol32((d), 1) ^ y
|
|
|
|
#define DECROUND(n, a, b, c, d) \
|
|
x = G1 (a); y = G2 (b); \
|
|
x += y; y += x; \
|
|
(d) ^= y + ctx->k[2 * (n) + 1]; \
|
|
(d) = ror32((d), 1); \
|
|
(c) = rol32((c), 1); \
|
|
(c) ^= (x + ctx->k[2 * (n)])
|
|
|
|
/* Encryption and decryption cycles; each one is simply two Feistel rounds
|
|
* with the 32-bit chunks re-ordered to simulate the "swap" */
|
|
|
|
#define ENCCYCLE(n) \
|
|
ENCROUND (2 * (n), a, b, c, d); \
|
|
ENCROUND (2 * (n) + 1, c, d, a, b)
|
|
|
|
#define DECCYCLE(n) \
|
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DECROUND (2 * (n) + 1, c, d, a, b); \
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DECROUND (2 * (n), a, b, c, d)
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/* Macros to convert the input and output bytes into 32-bit words,
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* and simultaneously perform the whitening step. INPACK packs word
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* number n into the variable named by x, using whitening subkey number m.
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* OUTUNPACK unpacks word number n from the variable named by x, using
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* whitening subkey number m. */
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#define INPACK(n, x, m) \
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x = le32_to_cpu(src[n]) ^ ctx->w[m]
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#define OUTUNPACK(n, x, m) \
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x ^= ctx->w[m]; \
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dst[n] = cpu_to_le32(x)
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#define TF_MIN_KEY_SIZE 16
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#define TF_MAX_KEY_SIZE 32
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#define TF_BLOCK_SIZE 16
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/* Structure for an expanded Twofish key. s contains the key-dependent
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* S-boxes composed with the MDS matrix; w contains the eight "whitening"
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* subkeys, K[0] through K[7]. k holds the remaining, "round" subkeys. Note
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* that k[i] corresponds to what the Twofish paper calls K[i+8]. */
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struct twofish_ctx {
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u32 s[4][256], w[8], k[32];
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};
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/* Perform the key setup. */
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static int twofish_setkey(struct crypto_tfm *tfm, const u8 *key,
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unsigned int key_len, u32 *flags)
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{
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struct twofish_ctx *ctx = crypto_tfm_ctx(tfm);
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int i, j, k;
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/* Temporaries for CALC_K. */
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u32 x, y;
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/* The S vector used to key the S-boxes, split up into individual bytes.
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* 128-bit keys use only sa through sh; 256-bit use all of them. */
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u8 sa = 0, sb = 0, sc = 0, sd = 0, se = 0, sf = 0, sg = 0, sh = 0;
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u8 si = 0, sj = 0, sk = 0, sl = 0, sm = 0, sn = 0, so = 0, sp = 0;
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/* Temporary for CALC_S. */
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u8 tmp;
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/* Check key length. */
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if (key_len != 16 && key_len != 24 && key_len != 32)
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{
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*flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
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return -EINVAL; /* unsupported key length */
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}
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/* Compute the first two words of the S vector. The magic numbers are
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* the entries of the RS matrix, preprocessed through poly_to_exp. The
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* numbers in the comments are the original (polynomial form) matrix
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* entries. */
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CALC_S (sa, sb, sc, sd, 0, 0x00, 0x2D, 0x01, 0x2D); /* 01 A4 02 A4 */
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CALC_S (sa, sb, sc, sd, 1, 0x2D, 0xA4, 0x44, 0x8A); /* A4 56 A1 55 */
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CALC_S (sa, sb, sc, sd, 2, 0x8A, 0xD5, 0xBF, 0xD1); /* 55 82 FC 87 */
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CALC_S (sa, sb, sc, sd, 3, 0xD1, 0x7F, 0x3D, 0x99); /* 87 F3 C1 5A */
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CALC_S (sa, sb, sc, sd, 4, 0x99, 0x46, 0x66, 0x96); /* 5A 1E 47 58 */
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CALC_S (sa, sb, sc, sd, 5, 0x96, 0x3C, 0x5B, 0xED); /* 58 C6 AE DB */
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CALC_S (sa, sb, sc, sd, 6, 0xED, 0x37, 0x4F, 0xE0); /* DB 68 3D 9E */
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CALC_S (sa, sb, sc, sd, 7, 0xE0, 0xD0, 0x8C, 0x17); /* 9E E5 19 03 */
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CALC_S (se, sf, sg, sh, 8, 0x00, 0x2D, 0x01, 0x2D); /* 01 A4 02 A4 */
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CALC_S (se, sf, sg, sh, 9, 0x2D, 0xA4, 0x44, 0x8A); /* A4 56 A1 55 */
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CALC_S (se, sf, sg, sh, 10, 0x8A, 0xD5, 0xBF, 0xD1); /* 55 82 FC 87 */
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CALC_S (se, sf, sg, sh, 11, 0xD1, 0x7F, 0x3D, 0x99); /* 87 F3 C1 5A */
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CALC_S (se, sf, sg, sh, 12, 0x99, 0x46, 0x66, 0x96); /* 5A 1E 47 58 */
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CALC_S (se, sf, sg, sh, 13, 0x96, 0x3C, 0x5B, 0xED); /* 58 C6 AE DB */
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CALC_S (se, sf, sg, sh, 14, 0xED, 0x37, 0x4F, 0xE0); /* DB 68 3D 9E */
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CALC_S (se, sf, sg, sh, 15, 0xE0, 0xD0, 0x8C, 0x17); /* 9E E5 19 03 */
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if (key_len == 24 || key_len == 32) { /* 192- or 256-bit key */
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/* Calculate the third word of the S vector */
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CALC_S (si, sj, sk, sl, 16, 0x00, 0x2D, 0x01, 0x2D); /* 01 A4 02 A4 */
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CALC_S (si, sj, sk, sl, 17, 0x2D, 0xA4, 0x44, 0x8A); /* A4 56 A1 55 */
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CALC_S (si, sj, sk, sl, 18, 0x8A, 0xD5, 0xBF, 0xD1); /* 55 82 FC 87 */
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CALC_S (si, sj, sk, sl, 19, 0xD1, 0x7F, 0x3D, 0x99); /* 87 F3 C1 5A */
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CALC_S (si, sj, sk, sl, 20, 0x99, 0x46, 0x66, 0x96); /* 5A 1E 47 58 */
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CALC_S (si, sj, sk, sl, 21, 0x96, 0x3C, 0x5B, 0xED); /* 58 C6 AE DB */
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CALC_S (si, sj, sk, sl, 22, 0xED, 0x37, 0x4F, 0xE0); /* DB 68 3D 9E */
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CALC_S (si, sj, sk, sl, 23, 0xE0, 0xD0, 0x8C, 0x17); /* 9E E5 19 03 */
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}
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if (key_len == 32) { /* 256-bit key */
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/* Calculate the fourth word of the S vector */
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CALC_S (sm, sn, so, sp, 24, 0x00, 0x2D, 0x01, 0x2D); /* 01 A4 02 A4 */
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CALC_S (sm, sn, so, sp, 25, 0x2D, 0xA4, 0x44, 0x8A); /* A4 56 A1 55 */
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CALC_S (sm, sn, so, sp, 26, 0x8A, 0xD5, 0xBF, 0xD1); /* 55 82 FC 87 */
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CALC_S (sm, sn, so, sp, 27, 0xD1, 0x7F, 0x3D, 0x99); /* 87 F3 C1 5A */
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CALC_S (sm, sn, so, sp, 28, 0x99, 0x46, 0x66, 0x96); /* 5A 1E 47 58 */
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CALC_S (sm, sn, so, sp, 29, 0x96, 0x3C, 0x5B, 0xED); /* 58 C6 AE DB */
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CALC_S (sm, sn, so, sp, 30, 0xED, 0x37, 0x4F, 0xE0); /* DB 68 3D 9E */
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CALC_S (sm, sn, so, sp, 31, 0xE0, 0xD0, 0x8C, 0x17); /* 9E E5 19 03 */
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/* Compute the S-boxes. */
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for ( i = j = 0, k = 1; i < 256; i++, j += 2, k += 2 ) {
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CALC_SB256_2( i, calc_sb_tbl[j], calc_sb_tbl[k] );
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}
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/* Calculate whitening and round subkeys. The constants are
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* indices of subkeys, preprocessed through q0 and q1. */
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CALC_K256 (w, 0, 0xA9, 0x75, 0x67, 0xF3);
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CALC_K256 (w, 2, 0xB3, 0xC6, 0xE8, 0xF4);
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CALC_K256 (w, 4, 0x04, 0xDB, 0xFD, 0x7B);
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CALC_K256 (w, 6, 0xA3, 0xFB, 0x76, 0xC8);
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CALC_K256 (k, 0, 0x9A, 0x4A, 0x92, 0xD3);
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CALC_K256 (k, 2, 0x80, 0xE6, 0x78, 0x6B);
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CALC_K256 (k, 4, 0xE4, 0x45, 0xDD, 0x7D);
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CALC_K256 (k, 6, 0xD1, 0xE8, 0x38, 0x4B);
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CALC_K256 (k, 8, 0x0D, 0xD6, 0xC6, 0x32);
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CALC_K256 (k, 10, 0x35, 0xD8, 0x98, 0xFD);
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CALC_K256 (k, 12, 0x18, 0x37, 0xF7, 0x71);
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CALC_K256 (k, 14, 0xEC, 0xF1, 0x6C, 0xE1);
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CALC_K256 (k, 16, 0x43, 0x30, 0x75, 0x0F);
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CALC_K256 (k, 18, 0x37, 0xF8, 0x26, 0x1B);
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CALC_K256 (k, 20, 0xFA, 0x87, 0x13, 0xFA);
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CALC_K256 (k, 22, 0x94, 0x06, 0x48, 0x3F);
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CALC_K256 (k, 24, 0xF2, 0x5E, 0xD0, 0xBA);
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CALC_K256 (k, 26, 0x8B, 0xAE, 0x30, 0x5B);
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CALC_K256 (k, 28, 0x84, 0x8A, 0x54, 0x00);
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CALC_K256 (k, 30, 0xDF, 0xBC, 0x23, 0x9D);
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} else if (key_len == 24) { /* 192-bit key */
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/* Compute the S-boxes. */
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for ( i = j = 0, k = 1; i < 256; i++, j += 2, k += 2 ) {
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CALC_SB192_2( i, calc_sb_tbl[j], calc_sb_tbl[k] );
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}
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/* Calculate whitening and round subkeys. The constants are
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* indices of subkeys, preprocessed through q0 and q1. */
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CALC_K192 (w, 0, 0xA9, 0x75, 0x67, 0xF3);
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CALC_K192 (w, 2, 0xB3, 0xC6, 0xE8, 0xF4);
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CALC_K192 (w, 4, 0x04, 0xDB, 0xFD, 0x7B);
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CALC_K192 (w, 6, 0xA3, 0xFB, 0x76, 0xC8);
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CALC_K192 (k, 0, 0x9A, 0x4A, 0x92, 0xD3);
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CALC_K192 (k, 2, 0x80, 0xE6, 0x78, 0x6B);
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CALC_K192 (k, 4, 0xE4, 0x45, 0xDD, 0x7D);
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CALC_K192 (k, 6, 0xD1, 0xE8, 0x38, 0x4B);
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CALC_K192 (k, 8, 0x0D, 0xD6, 0xC6, 0x32);
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CALC_K192 (k, 10, 0x35, 0xD8, 0x98, 0xFD);
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CALC_K192 (k, 12, 0x18, 0x37, 0xF7, 0x71);
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CALC_K192 (k, 14, 0xEC, 0xF1, 0x6C, 0xE1);
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CALC_K192 (k, 16, 0x43, 0x30, 0x75, 0x0F);
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CALC_K192 (k, 18, 0x37, 0xF8, 0x26, 0x1B);
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CALC_K192 (k, 20, 0xFA, 0x87, 0x13, 0xFA);
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CALC_K192 (k, 22, 0x94, 0x06, 0x48, 0x3F);
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CALC_K192 (k, 24, 0xF2, 0x5E, 0xD0, 0xBA);
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CALC_K192 (k, 26, 0x8B, 0xAE, 0x30, 0x5B);
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CALC_K192 (k, 28, 0x84, 0x8A, 0x54, 0x00);
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CALC_K192 (k, 30, 0xDF, 0xBC, 0x23, 0x9D);
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} else { /* 128-bit key */
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/* Compute the S-boxes. */
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for ( i = j = 0, k = 1; i < 256; i++, j += 2, k += 2 ) {
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CALC_SB_2( i, calc_sb_tbl[j], calc_sb_tbl[k] );
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}
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/* Calculate whitening and round subkeys. The constants are
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* indices of subkeys, preprocessed through q0 and q1. */
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CALC_K (w, 0, 0xA9, 0x75, 0x67, 0xF3);
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CALC_K (w, 2, 0xB3, 0xC6, 0xE8, 0xF4);
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CALC_K (w, 4, 0x04, 0xDB, 0xFD, 0x7B);
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CALC_K (w, 6, 0xA3, 0xFB, 0x76, 0xC8);
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CALC_K (k, 0, 0x9A, 0x4A, 0x92, 0xD3);
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CALC_K (k, 2, 0x80, 0xE6, 0x78, 0x6B);
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CALC_K (k, 4, 0xE4, 0x45, 0xDD, 0x7D);
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CALC_K (k, 6, 0xD1, 0xE8, 0x38, 0x4B);
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CALC_K (k, 8, 0x0D, 0xD6, 0xC6, 0x32);
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CALC_K (k, 10, 0x35, 0xD8, 0x98, 0xFD);
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CALC_K (k, 12, 0x18, 0x37, 0xF7, 0x71);
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CALC_K (k, 14, 0xEC, 0xF1, 0x6C, 0xE1);
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CALC_K (k, 16, 0x43, 0x30, 0x75, 0x0F);
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CALC_K (k, 18, 0x37, 0xF8, 0x26, 0x1B);
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CALC_K (k, 20, 0xFA, 0x87, 0x13, 0xFA);
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CALC_K (k, 22, 0x94, 0x06, 0x48, 0x3F);
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CALC_K (k, 24, 0xF2, 0x5E, 0xD0, 0xBA);
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CALC_K (k, 26, 0x8B, 0xAE, 0x30, 0x5B);
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CALC_K (k, 28, 0x84, 0x8A, 0x54, 0x00);
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CALC_K (k, 30, 0xDF, 0xBC, 0x23, 0x9D);
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}
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return 0;
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}
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/* Encrypt one block. in and out may be the same. */
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static void twofish_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
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{
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struct twofish_ctx *ctx = crypto_tfm_ctx(tfm);
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const __le32 *src = (const __le32 *)in;
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__le32 *dst = (__le32 *)out;
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/* The four 32-bit chunks of the text. */
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u32 a, b, c, d;
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/* Temporaries used by the round function. */
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u32 x, y;
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/* Input whitening and packing. */
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INPACK (0, a, 0);
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INPACK (1, b, 1);
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INPACK (2, c, 2);
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INPACK (3, d, 3);
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/* Encryption Feistel cycles. */
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ENCCYCLE (0);
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ENCCYCLE (1);
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ENCCYCLE (2);
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ENCCYCLE (3);
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ENCCYCLE (4);
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ENCCYCLE (5);
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ENCCYCLE (6);
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ENCCYCLE (7);
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/* Output whitening and unpacking. */
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OUTUNPACK (0, c, 4);
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OUTUNPACK (1, d, 5);
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OUTUNPACK (2, a, 6);
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OUTUNPACK (3, b, 7);
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}
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/* Decrypt one block. in and out may be the same. */
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static void twofish_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
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{
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struct twofish_ctx *ctx = crypto_tfm_ctx(tfm);
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const __le32 *src = (const __le32 *)in;
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__le32 *dst = (__le32 *)out;
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/* The four 32-bit chunks of the text. */
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u32 a, b, c, d;
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/* Temporaries used by the round function. */
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u32 x, y;
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/* Input whitening and packing. */
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INPACK (0, c, 4);
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INPACK (1, d, 5);
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INPACK (2, a, 6);
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INPACK (3, b, 7);
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/* Encryption Feistel cycles. */
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DECCYCLE (7);
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DECCYCLE (6);
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DECCYCLE (5);
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DECCYCLE (4);
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DECCYCLE (3);
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DECCYCLE (2);
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DECCYCLE (1);
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DECCYCLE (0);
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/* Output whitening and unpacking. */
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OUTUNPACK (0, a, 0);
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OUTUNPACK (1, b, 1);
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OUTUNPACK (2, c, 2);
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OUTUNPACK (3, d, 3);
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}
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static struct crypto_alg alg = {
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.cra_name = "twofish",
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.cra_flags = CRYPTO_ALG_TYPE_CIPHER,
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.cra_blocksize = TF_BLOCK_SIZE,
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.cra_ctxsize = sizeof(struct twofish_ctx),
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.cra_alignmask = 3,
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.cra_module = THIS_MODULE,
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.cra_list = LIST_HEAD_INIT(alg.cra_list),
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.cra_u = { .cipher = {
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.cia_min_keysize = TF_MIN_KEY_SIZE,
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.cia_max_keysize = TF_MAX_KEY_SIZE,
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.cia_setkey = twofish_setkey,
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.cia_encrypt = twofish_encrypt,
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.cia_decrypt = twofish_decrypt } }
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};
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static int __init init(void)
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{
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return crypto_register_alg(&alg);
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}
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static void __exit fini(void)
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{
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crypto_unregister_alg(&alg);
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}
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module_init(init);
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module_exit(fini);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION ("Twofish Cipher Algorithm");
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