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authorHerbert Xu <herbert@gondor.apana.org.au>2005-07-06 13:53:47 -0700
committerDavid S. Miller <davem@davemloft.net>2005-07-06 13:53:47 -0700
commit915e8561d559abba1b81934e31e54a3f850fa7bf (patch)
tree12c08e7ec182ca11125097e2f485eab7a48b03df /crypto
parentfbdae9f3e7fb57c07cb0d973f113eb25da2e8ff2 (diff)
downloadlinux-linaro-stable-915e8561d559abba1b81934e31e54a3f850fa7bf.tar.gz
[CRYPTO] Handle unaligned iv from encrypt_iv/decrypt_iv
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>
Diffstat (limited to 'crypto')
-rw-r--r--crypto/cipher.c29
1 files changed, 27 insertions, 2 deletions
diff --git a/crypto/cipher.c b/crypto/cipher.c
index d3295ce14a57..1c92c6bb138b 100644
--- a/crypto/cipher.c
+++ b/crypto/cipher.c
@@ -154,6 +154,31 @@ static int crypt(const struct cipher_desc *desc,
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,
u8 *dst, const u8 *src,
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.info = iv;
- return crypt(&desc, dst, src, nbytes);
+ return crypt_iv_unaligned(&desc, dst, src, nbytes);
}
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.info = iv;
- return crypt(&desc, dst, src, nbytes);
+ return crypt_iv_unaligned(&desc, dst, src, nbytes);
}
static int nocrypt(struct crypto_tfm *tfm,