crypto: twofish-x86_64-3way - remove duplicated glue code and use shared glue code from glue_helper
Now that shared glue code is available, convert twofish-x86_64-3way to use it. Signed-off-by: Jussi Kivilinna <jussi.kivilinna@mbnet.fi> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Jussi Kivilinna
Herbert Xu
parent
964263afdc
commit
414cb5e7cc
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@ -3,11 +3,6 @@
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*
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* Copyright (c) 2011 Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
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*
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* CBC & ECB parts based on code (crypto/cbc.c,ecb.c) by:
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* Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
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* CTR part based on code (crypto/ctr.c) by:
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* (C) Copyright IBM Corp. 2007 - Joy Latten <latten@us.ibm.com>
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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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@ -33,6 +28,7 @@
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#include <crypto/algapi.h>
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#include <crypto/twofish.h>
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#include <crypto/b128ops.h>
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#include <asm/crypto/glue_helper.h>
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#include <crypto/lrw.h>
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#include <crypto/xts.h>
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@ -62,311 +58,136 @@ static inline void twofish_enc_blk_xor_3way(struct twofish_ctx *ctx, u8 *dst,
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__twofish_enc_blk_3way(ctx, dst, src, true);
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}
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static int ecb_crypt(struct blkcipher_desc *desc, struct blkcipher_walk *walk,
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void (*fn)(struct twofish_ctx *, u8 *, const u8 *),
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void (*fn_3way)(struct twofish_ctx *, u8 *, const u8 *))
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static void twofish_dec_blk_cbc_3way(void *ctx, u128 *dst, const u128 *src)
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{
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struct twofish_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
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unsigned int bsize = TF_BLOCK_SIZE;
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unsigned int nbytes;
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int err;
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u128 ivs[2];
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err = blkcipher_walk_virt(desc, walk);
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ivs[0] = src[0];
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ivs[1] = src[1];
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while ((nbytes = walk->nbytes)) {
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u8 *wsrc = walk->src.virt.addr;
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u8 *wdst = walk->dst.virt.addr;
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twofish_dec_blk_3way(ctx, (u8 *)dst, (u8 *)src);
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/* Process three block batch */
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if (nbytes >= bsize * 3) {
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do {
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fn_3way(ctx, wdst, wsrc);
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u128_xor(&dst[1], &dst[1], &ivs[0]);
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u128_xor(&dst[2], &dst[2], &ivs[1]);
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}
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wsrc += bsize * 3;
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wdst += bsize * 3;
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nbytes -= bsize * 3;
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} while (nbytes >= bsize * 3);
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static void twofish_enc_blk_ctr(void *ctx, u128 *dst, const u128 *src, u128 *iv)
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{
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be128 ctrblk;
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if (nbytes < bsize)
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goto done;
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}
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if (dst != src)
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*dst = *src;
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/* Handle leftovers */
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do {
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fn(ctx, wdst, wsrc);
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u128_to_be128(&ctrblk, iv);
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u128_inc(iv);
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wsrc += bsize;
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wdst += bsize;
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nbytes -= bsize;
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} while (nbytes >= bsize);
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twofish_enc_blk(ctx, (u8 *)&ctrblk, (u8 *)&ctrblk);
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u128_xor(dst, dst, (u128 *)&ctrblk);
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}
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done:
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err = blkcipher_walk_done(desc, walk, nbytes);
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static void twofish_enc_blk_ctr_3way(void *ctx, u128 *dst, const u128 *src,
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u128 *iv)
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{
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be128 ctrblks[3];
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if (dst != src) {
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dst[0] = src[0];
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dst[1] = src[1];
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dst[2] = src[2];
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}
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return err;
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u128_to_be128(&ctrblks[0], iv);
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u128_inc(iv);
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u128_to_be128(&ctrblks[1], iv);
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u128_inc(iv);
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u128_to_be128(&ctrblks[2], iv);
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u128_inc(iv);
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twofish_enc_blk_xor_3way(ctx, (u8 *)dst, (u8 *)ctrblks);
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}
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static const struct common_glue_ctx twofish_enc = {
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.num_funcs = 2,
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.fpu_blocks_limit = -1,
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.funcs = { {
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.num_blocks = 3,
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.fn_u = { .ecb = GLUE_FUNC_CAST(twofish_enc_blk_3way) }
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}, {
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.num_blocks = 1,
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.fn_u = { .ecb = GLUE_FUNC_CAST(twofish_enc_blk) }
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} }
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};
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static const struct common_glue_ctx twofish_ctr = {
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.num_funcs = 2,
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.fpu_blocks_limit = -1,
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.funcs = { {
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.num_blocks = 3,
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.fn_u = { .ecb = GLUE_FUNC_CAST(twofish_enc_blk_ctr_3way) }
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}, {
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.num_blocks = 1,
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.fn_u = { .ecb = GLUE_FUNC_CAST(twofish_enc_blk_ctr) }
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} }
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};
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static const struct common_glue_ctx twofish_dec = {
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.num_funcs = 2,
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.fpu_blocks_limit = -1,
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.funcs = { {
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.num_blocks = 3,
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.fn_u = { .ecb = GLUE_FUNC_CAST(twofish_dec_blk_3way) }
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}, {
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.num_blocks = 1,
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.fn_u = { .ecb = GLUE_FUNC_CAST(twofish_dec_blk) }
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} }
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};
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static const struct common_glue_ctx twofish_dec_cbc = {
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.num_funcs = 2,
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.fpu_blocks_limit = -1,
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.funcs = { {
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.num_blocks = 3,
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.fn_u = { .cbc = GLUE_CBC_FUNC_CAST(twofish_dec_blk_cbc_3way) }
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}, {
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.num_blocks = 1,
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.fn_u = { .cbc = GLUE_CBC_FUNC_CAST(twofish_dec_blk) }
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} }
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};
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static int ecb_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
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struct scatterlist *src, unsigned int nbytes)
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{
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struct blkcipher_walk walk;
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blkcipher_walk_init(&walk, dst, src, nbytes);
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return ecb_crypt(desc, &walk, twofish_enc_blk, twofish_enc_blk_3way);
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return glue_ecb_crypt_128bit(&twofish_enc, desc, dst, src, nbytes);
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}
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static int ecb_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
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struct scatterlist *src, unsigned int nbytes)
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{
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struct blkcipher_walk walk;
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blkcipher_walk_init(&walk, dst, src, nbytes);
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return ecb_crypt(desc, &walk, twofish_dec_blk, twofish_dec_blk_3way);
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}
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static unsigned int __cbc_encrypt(struct blkcipher_desc *desc,
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struct blkcipher_walk *walk)
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{
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struct twofish_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
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unsigned int bsize = TF_BLOCK_SIZE;
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unsigned int nbytes = walk->nbytes;
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u128 *src = (u128 *)walk->src.virt.addr;
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u128 *dst = (u128 *)walk->dst.virt.addr;
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u128 *iv = (u128 *)walk->iv;
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do {
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u128_xor(dst, src, iv);
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twofish_enc_blk(ctx, (u8 *)dst, (u8 *)dst);
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iv = dst;
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src += 1;
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dst += 1;
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nbytes -= bsize;
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} while (nbytes >= bsize);
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u128_xor((u128 *)walk->iv, (u128 *)walk->iv, iv);
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return nbytes;
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return glue_ecb_crypt_128bit(&twofish_dec, desc, dst, src, nbytes);
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}
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static int cbc_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
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struct scatterlist *src, unsigned int nbytes)
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{
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struct blkcipher_walk walk;
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int err;
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blkcipher_walk_init(&walk, dst, src, nbytes);
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err = blkcipher_walk_virt(desc, &walk);
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while ((nbytes = walk.nbytes)) {
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nbytes = __cbc_encrypt(desc, &walk);
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err = blkcipher_walk_done(desc, &walk, nbytes);
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}
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return err;
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}
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static unsigned int __cbc_decrypt(struct blkcipher_desc *desc,
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struct blkcipher_walk *walk)
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{
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struct twofish_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
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unsigned int bsize = TF_BLOCK_SIZE;
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unsigned int nbytes = walk->nbytes;
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u128 *src = (u128 *)walk->src.virt.addr;
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u128 *dst = (u128 *)walk->dst.virt.addr;
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u128 ivs[3 - 1];
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u128 last_iv;
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/* Start of the last block. */
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src += nbytes / bsize - 1;
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dst += nbytes / bsize - 1;
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last_iv = *src;
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/* Process three block batch */
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if (nbytes >= bsize * 3) {
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do {
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nbytes -= bsize * (3 - 1);
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src -= 3 - 1;
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dst -= 3 - 1;
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ivs[0] = src[0];
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ivs[1] = src[1];
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twofish_dec_blk_3way(ctx, (u8 *)dst, (u8 *)src);
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u128_xor(dst + 1, dst + 1, ivs + 0);
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u128_xor(dst + 2, dst + 2, ivs + 1);
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nbytes -= bsize;
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if (nbytes < bsize)
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goto done;
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u128_xor(dst, dst, src - 1);
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src -= 1;
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dst -= 1;
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} while (nbytes >= bsize * 3);
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if (nbytes < bsize)
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goto done;
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}
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/* Handle leftovers */
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for (;;) {
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twofish_dec_blk(ctx, (u8 *)dst, (u8 *)src);
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nbytes -= bsize;
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if (nbytes < bsize)
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break;
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u128_xor(dst, dst, src - 1);
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src -= 1;
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dst -= 1;
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}
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done:
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u128_xor(dst, dst, (u128 *)walk->iv);
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*(u128 *)walk->iv = last_iv;
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return nbytes;
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return glue_cbc_encrypt_128bit(GLUE_FUNC_CAST(twofish_enc_blk), desc,
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dst, src, nbytes);
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}
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static int cbc_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
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struct scatterlist *src, unsigned int nbytes)
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{
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struct blkcipher_walk walk;
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int err;
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blkcipher_walk_init(&walk, dst, src, nbytes);
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err = blkcipher_walk_virt(desc, &walk);
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while ((nbytes = walk.nbytes)) {
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nbytes = __cbc_decrypt(desc, &walk);
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err = blkcipher_walk_done(desc, &walk, nbytes);
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}
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return err;
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}
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static inline void u128_to_be128(be128 *dst, const u128 *src)
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{
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dst->a = cpu_to_be64(src->a);
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dst->b = cpu_to_be64(src->b);
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}
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static inline void be128_to_u128(u128 *dst, const be128 *src)
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{
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dst->a = be64_to_cpu(src->a);
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dst->b = be64_to_cpu(src->b);
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}
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static inline void u128_inc(u128 *i)
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{
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i->b++;
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if (!i->b)
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i->a++;
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}
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static void ctr_crypt_final(struct blkcipher_desc *desc,
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struct blkcipher_walk *walk)
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{
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struct twofish_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
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u8 *ctrblk = walk->iv;
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u8 keystream[TF_BLOCK_SIZE];
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u8 *src = walk->src.virt.addr;
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u8 *dst = walk->dst.virt.addr;
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unsigned int nbytes = walk->nbytes;
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twofish_enc_blk(ctx, keystream, ctrblk);
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crypto_xor(keystream, src, nbytes);
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memcpy(dst, keystream, nbytes);
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crypto_inc(ctrblk, TF_BLOCK_SIZE);
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}
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static unsigned int __ctr_crypt(struct blkcipher_desc *desc,
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struct blkcipher_walk *walk)
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{
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struct twofish_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
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unsigned int bsize = TF_BLOCK_SIZE;
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unsigned int nbytes = walk->nbytes;
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u128 *src = (u128 *)walk->src.virt.addr;
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u128 *dst = (u128 *)walk->dst.virt.addr;
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u128 ctrblk;
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be128 ctrblocks[3];
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be128_to_u128(&ctrblk, (be128 *)walk->iv);
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/* Process three block batch */
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if (nbytes >= bsize * 3) {
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do {
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if (dst != src) {
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dst[0] = src[0];
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dst[1] = src[1];
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dst[2] = src[2];
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}
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/* create ctrblks for parallel encrypt */
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u128_to_be128(&ctrblocks[0], &ctrblk);
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u128_inc(&ctrblk);
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u128_to_be128(&ctrblocks[1], &ctrblk);
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u128_inc(&ctrblk);
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u128_to_be128(&ctrblocks[2], &ctrblk);
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u128_inc(&ctrblk);
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twofish_enc_blk_xor_3way(ctx, (u8 *)dst,
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(u8 *)ctrblocks);
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src += 3;
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dst += 3;
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nbytes -= bsize * 3;
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} while (nbytes >= bsize * 3);
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if (nbytes < bsize)
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goto done;
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}
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/* Handle leftovers */
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do {
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if (dst != src)
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*dst = *src;
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u128_to_be128(&ctrblocks[0], &ctrblk);
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u128_inc(&ctrblk);
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twofish_enc_blk(ctx, (u8 *)ctrblocks, (u8 *)ctrblocks);
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u128_xor(dst, dst, (u128 *)ctrblocks);
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src += 1;
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dst += 1;
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nbytes -= bsize;
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} while (nbytes >= bsize);
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done:
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u128_to_be128((be128 *)walk->iv, &ctrblk);
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return nbytes;
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return glue_cbc_decrypt_128bit(&twofish_dec_cbc, desc, dst, src,
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nbytes);
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}
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static int ctr_crypt(struct blkcipher_desc *desc, struct scatterlist *dst,
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struct scatterlist *src, unsigned int nbytes)
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{
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struct blkcipher_walk walk;
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int err;
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blkcipher_walk_init(&walk, dst, src, nbytes);
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err = blkcipher_walk_virt_block(desc, &walk, TF_BLOCK_SIZE);
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while ((nbytes = walk.nbytes) >= TF_BLOCK_SIZE) {
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nbytes = __ctr_crypt(desc, &walk);
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err = blkcipher_walk_done(desc, &walk, nbytes);
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}
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if (walk.nbytes) {
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ctr_crypt_final(desc, &walk);
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err = blkcipher_walk_done(desc, &walk, 0);
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}
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return err;
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return glue_ctr_crypt_128bit(&twofish_ctr, desc, dst, src, nbytes);
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}
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static void encrypt_callback(void *priv, u8 *srcdst, unsigned int nbytes)
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@ -935,6 +935,7 @@ config CRYPTO_TWOFISH_X86_64_3WAY
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select CRYPTO_ALGAPI
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select CRYPTO_TWOFISH_COMMON
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select CRYPTO_TWOFISH_X86_64
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select CRYPTO_GLUE_HELPER_X86
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select CRYPTO_LRW
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select CRYPTO_XTS
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help
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