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| author | Sebastian Siewior <linux-crypto@ml.breakpoint.cc> | 2007-05-19 19:51:21 +1000 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2007-07-11 20:58:54 +0800 |
| commit | ca7c39385ce1a7b44894a4b225a4608624e90730 (patch) | |
| tree | 107948d1bd8010ccb5185f34e2c2ef93098586cb /crypto/blkcipher.c | |
| parent | fe3c5206adc5d7395828185ab73e9a522655b984 (diff) | |
| download | linux-ca7c39385ce1a7b44894a4b225a4608624e90730.tar.bz2 | |
[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/blkcipher.c')
| -rw-r--r-- | crypto/blkcipher.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/crypto/blkcipher.c b/crypto/blkcipher.c index 8edf40c835a7..40a3dcff15bb 100644 --- a/crypto/blkcipher.c +++ b/crypto/blkcipher.c @@ -336,16 +336,41 @@ static int blkcipher_walk_first(struct blkcipher_desc *desc, return blkcipher_walk_next(desc, walk); } +static int setkey_unaligned(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen) +{ + struct blkcipher_alg *cipher = &tfm->__crt_alg->cra_blkcipher; + unsigned long alignmask = crypto_tfm_alg_alignmask(tfm); + 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 = cipher->setkey(tfm, alignbuffer, keylen); + memset(alignbuffer, 0, absize); + kfree(buffer); + return ret; +} + static int setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen) { struct blkcipher_alg *cipher = &tfm->__crt_alg->cra_blkcipher; + unsigned long alignmask = crypto_tfm_alg_alignmask(tfm); if (keylen < cipher->min_keysize || keylen > cipher->max_keysize) { tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN; return -EINVAL; } + if ((unsigned long)key & alignmask) + return setkey_unaligned(tfm, key, keylen); + return cipher->setkey(tfm, key, keylen); } |