Commit af8e8073 authored by Stephan Mueller's avatar Stephan Mueller Committed by Herbert Xu
Browse files

crypto: af_alg - add user space interface for AEAD 



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: default avatarStephan Mueller <smueller@chronox.de>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent bc84b94a

crypto/af_alg.c

+6 −0
Original line number Diff line number Diff line
@@ -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;

		}

include/crypto/if_alg.h

+1 −0
Original line number Diff line number Diff line
@@ -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 {

include/uapi/linux/if_alg.h

+2 −0
Original line number Diff line number Diff line
@@ -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