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crypto: af_alg - add user space interface for AEAD

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AEAD requires the caller to specify the following information separate
from the data stream. This information allows the AEAD interface handler
to identify the AAD, ciphertext/plaintext and the authentication tag:

        * Associated authentication data of arbitrary length and
          length

        * Length of authentication tag for encryption

Signed-off-by: Stephan Mueller <smueller@chronox.de>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Stephan Mueller 2014-12-03 20:55:42 +01:00 committed by Herbert Xu
parent bc84b94a71
commit af8e80731a
3 changed files with 9 additions and 0 deletions
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6
crypto/af_alg.c
View File

@ -421,6 +421,12 @@ int af_alg_cmsg_send(struct msghdr *msg, struct af_alg_control *con)
con->op = *(u32 *)CMSG_DATA(cmsg);
break;
case ALG_SET_AEAD_ASSOCLEN:
if (cmsg->cmsg_len < CMSG_LEN(sizeof(u32)))
return -EINVAL;
con->aead_assoclen = *(u32 *)CMSG_DATA(cmsg);
break;
default:
return -EINVAL;
}

1
include/crypto/if_alg.h
View File

@ -42,6 +42,7 @@ struct af_alg_completion {
struct af_alg_control {
struct af_alg_iv *iv;
int op;
unsigned int aead_assoclen;
};
struct af_alg_type {

2
include/uapi/linux/if_alg.h
View File

@ -32,6 +32,8 @@ struct af_alg_iv {
#define ALG_SET_KEY 1
#define ALG_SET_IV 2
#define ALG_SET_OP 3
#define ALG_SET_AEAD_ASSOCLEN 4
#define ALG_SET_AEAD_AUTHSIZE 5
/* Operations */
#define ALG_OP_DECRYPT 0