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[CRYPTO] Handle unaligned iv from encrypt_iv/decrypt_iv

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Even though cit_iv is now always aligned, the user can still supply an
unaligned iv through crypto_cipher_encrypt_iv/crypto_cipher_decrypt_iv.
This patch will check the alignment of the user-supplied iv and copy
it if necessary.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Herbert Xu 2005-07-06 13:53:47 -07:00 committed by David S. Miller
parent fbdae9f3e7
commit 915e8561d5
1 changed files with 27 additions and 2 deletions
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29
crypto/cipher.c
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@ -154,6 +154,31 @@ static int crypt(const struct cipher_desc *desc,
return 0; return 0;
} }
static int crypt_iv_unaligned(struct cipher_desc *desc,
struct scatterlist *dst,
struct scatterlist *src,
unsigned int nbytes)
{
struct crypto_tfm *tfm = desc->tfm;
unsigned int alignmask = crypto_tfm_alg_alignmask(tfm);
u8 *iv = desc->info;
if (unlikely(((unsigned long)iv & alignmask))) {
unsigned int ivsize = tfm->crt_cipher.cit_ivsize;
u8 buffer[ivsize + alignmask];
u8 *tmp = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
int err;
desc->info = memcpy(tmp, iv, ivsize);
err = crypt(desc, dst, src, nbytes);
memcpy(iv, tmp, ivsize);
return err;
}
return crypt(desc, dst, src, nbytes);
}
static unsigned int cbc_process_encrypt(const struct cipher_desc *desc, static unsigned int cbc_process_encrypt(const struct cipher_desc *desc,
u8 *dst, const u8 *src, u8 *dst, const u8 *src,
unsigned int nbytes) unsigned int nbytes)
@ -298,7 +323,7 @@ static int cbc_encrypt_iv(struct crypto_tfm *tfm,
desc.prfn = cipher->cia_encrypt_cbc ?: cbc_process_encrypt; desc.prfn = cipher->cia_encrypt_cbc ?: cbc_process_encrypt;
desc.info = iv; desc.info = iv;
return crypt(&desc, dst, src, nbytes); return crypt_iv_unaligned(&desc, dst, src, nbytes);
} }
static int cbc_decrypt(struct crypto_tfm *tfm, static int cbc_decrypt(struct crypto_tfm *tfm,
@ -330,7 +355,7 @@ static int cbc_decrypt_iv(struct crypto_tfm *tfm,
desc.prfn = cipher->cia_decrypt_cbc ?: cbc_process_decrypt; desc.prfn = cipher->cia_decrypt_cbc ?: cbc_process_decrypt;
desc.info = iv; desc.info = iv;
return crypt(&desc, dst, src, nbytes); return crypt_iv_unaligned(&desc, dst, src, nbytes);
} }
static int nocrypt(struct crypto_tfm *tfm, static int nocrypt(struct crypto_tfm *tfm,