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| author | Sebastian Siewior <linux-crypto@ml.breakpoint.cc> | 2007-05-19 13:51:21 +0400 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2007-07-11 16:58:54 +0400 |
| commit | ca7c39385ce1a7b44894a4b225a4608624e90730 (patch) | |
| tree | 107948d1bd8010ccb5185f34e2c2ef93098586cb /crypto/hash.c | |
| parent | fe3c5206adc5d7395828185ab73e9a522655b984 (diff) | |
| download | linux-ca7c39385ce1a7b44894a4b225a4608624e90730.tar.xz | |
[CRYPTO] api: Handle unaligned keys in setkey
setkey() in {cipher,blkcipher,ablkcipher,hash}.c does not respect the
requested alignment by the algorithm. This patch fixes it. The extra
memory is allocated by kmalloc() with GFP_ATOMIC flag.
Signed-off-by: Sebastian Siewior <linux-crypto@ml.breakpoint.cc>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'crypto/hash.c')
| -rw-r--r-- | crypto/hash.c | 38 |
1 files changed, 37 insertions, 1 deletions
diff --git a/crypto/hash.c b/crypto/hash.c index 4ccd22deef39..4d75ca7b57b2 100644 --- a/crypto/hash.c +++ b/crypto/hash.c @@ -22,6 +22,42 @@ static unsigned int crypto_hash_ctxsize(struct crypto_alg *alg, u32 type, return alg->cra_ctxsize; } +static int hash_setkey_unaligned(struct crypto_hash *crt, const u8 *key, + unsigned int keylen) +{ + struct crypto_tfm *tfm = crypto_hash_tfm(crt); + struct hash_alg *alg = &tfm->__crt_alg->cra_hash; + unsigned long alignmask = crypto_hash_alignmask(crt); + int ret; + u8 *buffer, *alignbuffer; + unsigned long absize; + + absize = keylen + alignmask; + buffer = kmalloc(absize, GFP_ATOMIC); + if (!buffer) + return -ENOMEM; + + alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1); + memcpy(alignbuffer, key, keylen); + ret = alg->setkey(crt, alignbuffer, keylen); + memset(alignbuffer, 0, absize); + kfree(buffer); + return ret; +} + +static int hash_setkey(struct crypto_hash *crt, const u8 *key, + unsigned int keylen) +{ + struct crypto_tfm *tfm = crypto_hash_tfm(crt); + struct hash_alg *alg = &tfm->__crt_alg->cra_hash; + unsigned long alignmask = crypto_hash_alignmask(crt); + + if ((unsigned long)key & alignmask) + return hash_setkey_unaligned(crt, key, keylen); + + return alg->setkey(crt, key, keylen); +} + static int crypto_init_hash_ops(struct crypto_tfm *tfm, u32 type, u32 mask) { struct hash_tfm *crt = &tfm->crt_hash; @@ -34,7 +70,7 @@ static int crypto_init_hash_ops(struct crypto_tfm *tfm, u32 type, u32 mask) crt->update = alg->update; crt->final = alg->final; crt->digest = alg->digest; - crt->setkey = alg->setkey; + crt->setkey = hash_setkey; crt->digestsize = alg->digestsize; return 0; |