crypto: authenc - Convert to ahash

This patch converts authenc to the new ahash interface.

Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Steffen Klassert 2009-08-05 19:35:34 +10:00 committed by Herbert Xu
parent ab30046567
commit cbdcf80d8b

View file

@ -23,24 +23,36 @@
#include <linux/slab.h>
#include <linux/spinlock.h>
typedef u8 *(*authenc_ahash_t)(struct aead_request *req, unsigned int flags);
struct authenc_instance_ctx {
struct crypto_spawn auth;
struct crypto_ahash_spawn auth;
struct crypto_skcipher_spawn enc;
};
struct crypto_authenc_ctx {
spinlock_t auth_lock;
struct crypto_hash *auth;
unsigned int reqoff;
struct crypto_ahash *auth;
struct crypto_ablkcipher *enc;
};
struct authenc_request_ctx {
unsigned int cryptlen;
struct scatterlist *sg;
struct scatterlist asg[2];
struct scatterlist cipher[2];
crypto_completion_t complete;
crypto_completion_t update_complete;
char tail[];
};
static int crypto_authenc_setkey(struct crypto_aead *authenc, const u8 *key,
unsigned int keylen)
{
unsigned int authkeylen;
unsigned int enckeylen;
struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
struct crypto_hash *auth = ctx->auth;
struct crypto_ahash *auth = ctx->auth;
struct crypto_ablkcipher *enc = ctx->enc;
struct rtattr *rta = (void *)key;
struct crypto_authenc_key_param *param;
@ -64,11 +76,11 @@ static int crypto_authenc_setkey(struct crypto_aead *authenc, const u8 *key,
authkeylen = keylen - enckeylen;
crypto_hash_clear_flags(auth, CRYPTO_TFM_REQ_MASK);
crypto_hash_set_flags(auth, crypto_aead_get_flags(authenc) &
crypto_ahash_clear_flags(auth, CRYPTO_TFM_REQ_MASK);
crypto_ahash_set_flags(auth, crypto_aead_get_flags(authenc) &
CRYPTO_TFM_REQ_MASK);
err = crypto_hash_setkey(auth, key, authkeylen);
crypto_aead_set_flags(authenc, crypto_hash_get_flags(auth) &
err = crypto_ahash_setkey(auth, key, authkeylen);
crypto_aead_set_flags(authenc, crypto_ahash_get_flags(auth) &
CRYPTO_TFM_RES_MASK);
if (err)
@ -103,40 +115,198 @@ static void authenc_chain(struct scatterlist *head, struct scatterlist *sg,
sg_mark_end(head);
}
static u8 *crypto_authenc_hash(struct aead_request *req, unsigned int flags,
struct scatterlist *cipher,
unsigned int cryptlen)
static void authenc_geniv_ahash_update_done(struct crypto_async_request *areq,
int err)
{
struct aead_request *req = areq->data;
struct crypto_aead *authenc = crypto_aead_reqtfm(req);
struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
if (err)
goto out;
ahash_request_set_crypt(ahreq, areq_ctx->sg, ahreq->result,
areq_ctx->cryptlen);
ahash_request_set_callback(ahreq, aead_request_flags(req) &
CRYPTO_TFM_REQ_MAY_SLEEP,
areq_ctx->complete, req);
err = crypto_ahash_finup(ahreq);
if (err)
goto out;
scatterwalk_map_and_copy(ahreq->result, areq_ctx->sg,
areq_ctx->cryptlen,
crypto_aead_authsize(authenc), 1);
out:
aead_request_complete(req, err);
}
static void authenc_geniv_ahash_done(struct crypto_async_request *areq, int err)
{
struct aead_request *req = areq->data;
struct crypto_aead *authenc = crypto_aead_reqtfm(req);
struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
if (err)
goto out;
scatterwalk_map_and_copy(ahreq->result, areq_ctx->sg,
areq_ctx->cryptlen,
crypto_aead_authsize(authenc), 1);
out:
aead_request_complete(req, err);
}
static void authenc_verify_ahash_update_done(struct crypto_async_request *areq,
int err)
{
u8 *ihash;
unsigned int authsize;
struct ablkcipher_request *abreq;
struct aead_request *req = areq->data;
struct crypto_aead *authenc = crypto_aead_reqtfm(req);
struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
if (err)
goto out;
ahash_request_set_crypt(ahreq, areq_ctx->sg, ahreq->result,
areq_ctx->cryptlen);
ahash_request_set_callback(ahreq, aead_request_flags(req) &
CRYPTO_TFM_REQ_MAY_SLEEP,
areq_ctx->complete, req);
err = crypto_ahash_finup(ahreq);
if (err)
goto out;
authsize = crypto_aead_authsize(authenc);
ihash = ahreq->result + authsize;
scatterwalk_map_and_copy(ihash, areq_ctx->sg, areq_ctx->cryptlen,
authsize, 0);
err = memcmp(ihash, ahreq->result, authsize) ? -EBADMSG: 0;
if (err)
goto out;
abreq = aead_request_ctx(req);
ablkcipher_request_set_tfm(abreq, ctx->enc);
ablkcipher_request_set_callback(abreq, aead_request_flags(req),
req->base.complete, req->base.data);
ablkcipher_request_set_crypt(abreq, req->src, req->dst,
req->cryptlen, req->iv);
err = crypto_ablkcipher_decrypt(abreq);
out:
aead_request_complete(req, err);
}
static void authenc_verify_ahash_done(struct crypto_async_request *areq,
int err)
{
u8 *ihash;
unsigned int authsize;
struct ablkcipher_request *abreq;
struct aead_request *req = areq->data;
struct crypto_aead *authenc = crypto_aead_reqtfm(req);
struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
if (err)
goto out;
authsize = crypto_aead_authsize(authenc);
ihash = ahreq->result + authsize;
scatterwalk_map_and_copy(ihash, areq_ctx->sg, areq_ctx->cryptlen,
authsize, 0);
err = memcmp(ihash, ahreq->result, authsize) ? -EBADMSG: 0;
if (err)
goto out;
abreq = aead_request_ctx(req);
ablkcipher_request_set_tfm(abreq, ctx->enc);
ablkcipher_request_set_callback(abreq, aead_request_flags(req),
req->base.complete, req->base.data);
ablkcipher_request_set_crypt(abreq, req->src, req->dst,
req->cryptlen, req->iv);
err = crypto_ablkcipher_decrypt(abreq);
out:
aead_request_complete(req, err);
}
static u8 *crypto_authenc_ahash_fb(struct aead_request *req, unsigned int flags)
{
struct crypto_aead *authenc = crypto_aead_reqtfm(req);
struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
struct crypto_hash *auth = ctx->auth;
struct hash_desc desc = {
.tfm = auth,
.flags = aead_request_flags(req) & flags,
};
u8 *hash = aead_request_ctx(req);
struct crypto_ahash *auth = ctx->auth;
struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
u8 *hash = areq_ctx->tail;
int err;
hash = (u8 *)ALIGN((unsigned long)hash + crypto_hash_alignmask(auth),
crypto_hash_alignmask(auth) + 1);
hash = (u8 *)ALIGN((unsigned long)hash + crypto_ahash_alignmask(auth),
crypto_ahash_alignmask(auth) + 1);
spin_lock_bh(&ctx->auth_lock);
err = crypto_hash_init(&desc);
ahash_request_set_tfm(ahreq, auth);
err = crypto_ahash_init(ahreq);
if (err)
goto auth_unlock;
return ERR_PTR(err);
err = crypto_hash_update(&desc, req->assoc, req->assoclen);
ahash_request_set_crypt(ahreq, req->assoc, hash, req->assoclen);
ahash_request_set_callback(ahreq, aead_request_flags(req) & flags,
areq_ctx->update_complete, req);
err = crypto_ahash_update(ahreq);
if (err)
goto auth_unlock;
return ERR_PTR(err);
err = crypto_hash_update(&desc, cipher, cryptlen);
ahash_request_set_crypt(ahreq, areq_ctx->sg, hash,
areq_ctx->cryptlen);
ahash_request_set_callback(ahreq, aead_request_flags(req) & flags,
areq_ctx->complete, req);
err = crypto_ahash_finup(ahreq);
if (err)
goto auth_unlock;
return ERR_PTR(err);
err = crypto_hash_final(&desc, hash);
auth_unlock:
spin_unlock_bh(&ctx->auth_lock);
return hash;
}
static u8 *crypto_authenc_ahash(struct aead_request *req, unsigned int flags)
{
struct crypto_aead *authenc = crypto_aead_reqtfm(req);
struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
struct crypto_ahash *auth = ctx->auth;
struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
u8 *hash = areq_ctx->tail;
int err;
hash = (u8 *)ALIGN((unsigned long)hash + crypto_ahash_alignmask(auth),
crypto_ahash_alignmask(auth) + 1);
ahash_request_set_tfm(ahreq, auth);
ahash_request_set_crypt(ahreq, areq_ctx->sg, hash,
areq_ctx->cryptlen);
ahash_request_set_callback(ahreq, aead_request_flags(req) & flags,
areq_ctx->complete, req);
err = crypto_ahash_digest(ahreq);
if (err)
return ERR_PTR(err);
@ -147,11 +317,15 @@ static int crypto_authenc_genicv(struct aead_request *req, u8 *iv,
unsigned int flags)
{
struct crypto_aead *authenc = crypto_aead_reqtfm(req);
struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
struct scatterlist *dst = req->dst;
struct scatterlist cipher[2];
struct page *dstp;
struct scatterlist *assoc = req->assoc;
struct scatterlist *cipher = areq_ctx->cipher;
struct scatterlist *asg = areq_ctx->asg;
unsigned int ivsize = crypto_aead_ivsize(authenc);
unsigned int cryptlen;
unsigned int cryptlen = req->cryptlen;
authenc_ahash_t authenc_ahash_fn = crypto_authenc_ahash_fb;
struct page *dstp;
u8 *vdst;
u8 *hash;
@ -163,10 +337,25 @@ static int crypto_authenc_genicv(struct aead_request *req, u8 *iv,
sg_set_buf(cipher, iv, ivsize);
authenc_chain(cipher, dst, vdst == iv + ivsize);
dst = cipher;
cryptlen += ivsize;
}
cryptlen = req->cryptlen + ivsize;
hash = crypto_authenc_hash(req, flags, dst, cryptlen);
if (sg_is_last(assoc)) {
authenc_ahash_fn = crypto_authenc_ahash;
sg_init_table(asg, 2);
sg_set_page(asg, sg_page(assoc), assoc->length, assoc->offset);
authenc_chain(asg, dst, 0);
dst = asg;
cryptlen += req->assoclen;
}
areq_ctx->cryptlen = cryptlen;
areq_ctx->sg = dst;
areq_ctx->complete = authenc_geniv_ahash_done;
areq_ctx->update_complete = authenc_geniv_ahash_update_done;
hash = authenc_ahash_fn(req, flags);
if (IS_ERR(hash))
return PTR_ERR(hash);
@ -256,22 +445,25 @@ static int crypto_authenc_givencrypt(struct aead_givcrypt_request *req)
}
static int crypto_authenc_verify(struct aead_request *req,
struct scatterlist *cipher,
unsigned int cryptlen)
authenc_ahash_t authenc_ahash_fn)
{
struct crypto_aead *authenc = crypto_aead_reqtfm(req);
struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
u8 *ohash;
u8 *ihash;
unsigned int authsize;
ohash = crypto_authenc_hash(req, CRYPTO_TFM_REQ_MAY_SLEEP, cipher,
cryptlen);
areq_ctx->complete = authenc_verify_ahash_done;
areq_ctx->complete = authenc_verify_ahash_update_done;
ohash = authenc_ahash_fn(req, CRYPTO_TFM_REQ_MAY_SLEEP);
if (IS_ERR(ohash))
return PTR_ERR(ohash);
authsize = crypto_aead_authsize(authenc);
ihash = ohash + authsize;
scatterwalk_map_and_copy(ihash, cipher, cryptlen, authsize, 0);
scatterwalk_map_and_copy(ihash, areq_ctx->sg, areq_ctx->cryptlen,
authsize, 0);
return memcmp(ihash, ohash, authsize) ? -EBADMSG: 0;
}
@ -279,10 +471,14 @@ static int crypto_authenc_iverify(struct aead_request *req, u8 *iv,
unsigned int cryptlen)
{
struct crypto_aead *authenc = crypto_aead_reqtfm(req);
struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
struct scatterlist *src = req->src;
struct scatterlist cipher[2];
struct page *srcp;
struct scatterlist *assoc = req->assoc;
struct scatterlist *cipher = areq_ctx->cipher;
struct scatterlist *asg = areq_ctx->asg;
unsigned int ivsize = crypto_aead_ivsize(authenc);
authenc_ahash_t authenc_ahash_fn = crypto_authenc_ahash_fb;
struct page *srcp;
u8 *vsrc;
srcp = sg_page(src);
@ -293,9 +489,22 @@ static int crypto_authenc_iverify(struct aead_request *req, u8 *iv,
sg_set_buf(cipher, iv, ivsize);
authenc_chain(cipher, src, vsrc == iv + ivsize);
src = cipher;
cryptlen += ivsize;
}
return crypto_authenc_verify(req, src, cryptlen + ivsize);
if (sg_is_last(assoc)) {
authenc_ahash_fn = crypto_authenc_ahash;
sg_init_table(asg, 2);
sg_set_page(asg, sg_page(assoc), assoc->length, assoc->offset);
authenc_chain(asg, src, 0);
src = asg;
cryptlen += req->assoclen;
}
areq_ctx->cryptlen = cryptlen;
areq_ctx->sg = src;
return crypto_authenc_verify(req, authenc_ahash_fn);
}
static int crypto_authenc_decrypt(struct aead_request *req)
@ -326,38 +535,41 @@ static int crypto_authenc_decrypt(struct aead_request *req)
static int crypto_authenc_init_tfm(struct crypto_tfm *tfm)
{
struct crypto_instance *inst = (void *)tfm->__crt_alg;
struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
struct authenc_instance_ctx *ictx = crypto_instance_ctx(inst);
struct crypto_authenc_ctx *ctx = crypto_tfm_ctx(tfm);
struct crypto_hash *auth;
struct crypto_ahash *auth;
struct crypto_ablkcipher *enc;
int err;
auth = crypto_spawn_hash(&ictx->auth);
auth = crypto_spawn_ahash(&ictx->auth);
if (IS_ERR(auth))
return PTR_ERR(auth);
ctx->reqoff = ALIGN(2 * crypto_ahash_digestsize(auth) +
crypto_ahash_alignmask(auth),
crypto_ahash_alignmask(auth) + 1);
enc = crypto_spawn_skcipher(&ictx->enc);
err = PTR_ERR(enc);
if (IS_ERR(enc))
goto err_free_hash;
goto err_free_ahash;
ctx->auth = auth;
ctx->enc = enc;
tfm->crt_aead.reqsize = max_t(unsigned int,
(crypto_hash_alignmask(auth) &
~(crypto_tfm_ctx_alignment() - 1)) +
crypto_hash_digestsize(auth) * 2,
sizeof(struct skcipher_givcrypt_request) +
crypto_ablkcipher_reqsize(enc) +
crypto_ablkcipher_ivsize(enc));
spin_lock_init(&ctx->auth_lock);
crypto_ahash_reqsize(auth) + ctx->reqoff +
sizeof(struct authenc_request_ctx) +
sizeof(struct ahash_request),
sizeof(struct skcipher_givcrypt_request) +
crypto_ablkcipher_reqsize(enc) +
crypto_ablkcipher_ivsize(enc));
return 0;
err_free_hash:
crypto_free_hash(auth);
err_free_ahash:
crypto_free_ahash(auth);
return err;
}
@ -365,7 +577,7 @@ static void crypto_authenc_exit_tfm(struct crypto_tfm *tfm)
{
struct crypto_authenc_ctx *ctx = crypto_tfm_ctx(tfm);
crypto_free_hash(ctx->auth);
crypto_free_ahash(ctx->auth);
crypto_free_ablkcipher(ctx->enc);
}
@ -373,7 +585,8 @@ static struct crypto_instance *crypto_authenc_alloc(struct rtattr **tb)
{
struct crypto_attr_type *algt;
struct crypto_instance *inst;
struct crypto_alg *auth;
struct hash_alg_common *auth;
struct crypto_alg *auth_base;
struct crypto_alg *enc;
struct authenc_instance_ctx *ctx;
const char *enc_name;
@ -387,11 +600,13 @@ static struct crypto_instance *crypto_authenc_alloc(struct rtattr **tb)
if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
return ERR_PTR(-EINVAL);
auth = crypto_attr_alg(tb[1], CRYPTO_ALG_TYPE_HASH,
CRYPTO_ALG_TYPE_HASH_MASK);
auth = ahash_attr_alg(tb[1], CRYPTO_ALG_TYPE_HASH,
CRYPTO_ALG_TYPE_AHASH_MASK);
if (IS_ERR(auth))
return ERR_PTR(PTR_ERR(auth));
auth_base = &auth->base;
enc_name = crypto_attr_alg_name(tb[2]);
err = PTR_ERR(enc_name);
if (IS_ERR(enc_name))
@ -404,7 +619,7 @@ static struct crypto_instance *crypto_authenc_alloc(struct rtattr **tb)
ctx = crypto_instance_ctx(inst);
err = crypto_init_spawn(&ctx->auth, auth, inst, CRYPTO_ALG_TYPE_MASK);
err = crypto_init_ahash_spawn(&ctx->auth, auth, inst);
if (err)
goto err_free_inst;
@ -419,24 +634,25 @@ static struct crypto_instance *crypto_authenc_alloc(struct rtattr **tb)
err = -ENAMETOOLONG;
if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME,
"authenc(%s,%s)", auth->cra_name, enc->cra_name) >=
"authenc(%s,%s)", auth_base->cra_name, enc->cra_name) >=
CRYPTO_MAX_ALG_NAME)
goto err_drop_enc;
if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
"authenc(%s,%s)", auth->cra_driver_name,
"authenc(%s,%s)", auth_base->cra_driver_name,
enc->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
goto err_drop_enc;
inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD;
inst->alg.cra_flags |= enc->cra_flags & CRYPTO_ALG_ASYNC;
inst->alg.cra_priority = enc->cra_priority * 10 + auth->cra_priority;
inst->alg.cra_priority = enc->cra_priority *
10 + auth_base->cra_priority;
inst->alg.cra_blocksize = enc->cra_blocksize;
inst->alg.cra_alignmask = auth->cra_alignmask | enc->cra_alignmask;
inst->alg.cra_alignmask = auth_base->cra_alignmask | enc->cra_alignmask;
inst->alg.cra_type = &crypto_aead_type;
inst->alg.cra_aead.ivsize = enc->cra_ablkcipher.ivsize;
inst->alg.cra_aead.maxauthsize = __crypto_shash_alg(auth)->digestsize;
inst->alg.cra_aead.maxauthsize = auth->digestsize;
inst->alg.cra_ctxsize = sizeof(struct crypto_authenc_ctx);
@ -449,13 +665,13 @@ static struct crypto_instance *crypto_authenc_alloc(struct rtattr **tb)
inst->alg.cra_aead.givencrypt = crypto_authenc_givencrypt;
out:
crypto_mod_put(auth);
crypto_mod_put(auth_base);
return inst;
err_drop_enc:
crypto_drop_skcipher(&ctx->enc);
err_drop_auth:
crypto_drop_spawn(&ctx->auth);
crypto_drop_ahash(&ctx->auth);
err_free_inst:
kfree(inst);
out_put_auth:
@ -468,7 +684,7 @@ static void crypto_authenc_free(struct crypto_instance *inst)
struct authenc_instance_ctx *ctx = crypto_instance_ctx(inst);
crypto_drop_skcipher(&ctx->enc);
crypto_drop_spawn(&ctx->auth);
crypto_drop_ahash(&ctx->auth);
kfree(inst);
}