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authorHerbert Xu <herbert@gondor.apana.org.au>2007-12-10 16:18:01 +0800
committerHerbert Xu <herbert@gondor.apana.org.au>2008-01-11 08:16:49 +1100
commit743edf57272fd420348e148bf94f9e48ed6abb70 (patch)
treebe4a96ae7f7f8a6b42bf01cc7a61cb4b5938ab50 /crypto
parent03bf712fb4defc7831c727d1e32d0269f7f96de0 (diff)
downloadlinux-743edf57272fd420348e148bf94f9e48ed6abb70.tar.gz
[CRYPTO] aead: Add givcrypt operations
This patch adds the underlying givcrypt operations for aead and associated support elements. The rationale is identical to that of the skcipher givcrypt operations, i.e., sometimes only the algorithm knows how the IV should be generated. A new request type aead_givcrypt_request is added which contains an embedded aead_request structure with two new elements to support this operation. The new elements are seq and giv. The seq field should contain a strictly increasing 64-bit integer which may be used by certain IV generators as an input value. The giv field will be used to store the generated IV. It does not need to obey the alignment requirements of the algorithm because it's not used during the operation. The existing iv field must still be available as it will be used to store intermediate IVs and the output IV if chaining is desired. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'crypto')
-rw-r--r--crypto/aead.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/crypto/aead.c b/crypto/aead.c
index f23c2b0ee00..0402b606fcf 100644
--- a/crypto/aead.c
+++ b/crypto/aead.c
@@ -77,6 +77,11 @@ static unsigned int crypto_aead_ctxsize(struct crypto_alg *alg, u32 type,
return alg->cra_ctxsize;
}
+static int no_givdecrypt(struct aead_givcrypt_request *req)
+{
+ return -ENOSYS;
+}
+
static int crypto_init_aead_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
{
struct aead_alg *alg = &tfm->__crt_alg->cra_aead;
@@ -88,6 +93,8 @@ static int crypto_init_aead_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
crt->setkey = setkey;
crt->encrypt = alg->encrypt;
crt->decrypt = alg->decrypt;
+ crt->givencrypt = alg->givencrypt;
+ crt->givdecrypt = alg->givdecrypt ?: no_givdecrypt;
crt->ivsize = alg->ivsize;
crt->authsize = alg->maxauthsize;