From: Stephan Mueller Subject: [PATCH v5 1/8] crypto: AF_ALG: add user space interface for AEAD Date: Sun, 07 Dec 2014 23:21:09 +0100 Message-ID: <2166020.BKWmrnVj2j@tachyon.chronox.de> References: <56740432.V2v4gLHrzS@tachyon.chronox.de> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7Bit Cc: Daniel Borkmann , 'Quentin Gouchet' , 'LKML' , linux-crypto@vger.kernel.org, linux-api@vger.kernel.org To: Herbert Xu Return-path: Received: from mail.eperm.de ([89.247.134.16]:54996 "EHLO mail.eperm.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753585AbaLGWhB (ORCPT ); Sun, 7 Dec 2014 17:37:01 -0500 Received: from tachyon.chronox.de by mail.eperm.de with [XMail 1.27 ESMTP Server] id for from ; Sun, 7 Dec 2014 23:36:54 +0100 In-Reply-To: <56740432.V2v4gLHrzS@tachyon.chronox.de> Sender: linux-crypto-owner@vger.kernel.org List-ID: 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 --- crypto/af_alg.c | 6 ++++++ include/crypto/if_alg.h | 1 + include/uapi/linux/if_alg.h | 2 ++ 3 files changed, 9 insertions(+) diff --git a/crypto/af_alg.c b/crypto/af_alg.c index 6a3ad80..68ff113 100644 --- a/crypto/af_alg.c +++ b/crypto/af_alg.c @@ -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; } diff --git a/include/crypto/if_alg.h b/include/crypto/if_alg.h index d61c111..cd62bf4 100644 --- a/include/crypto/if_alg.h +++ b/include/crypto/if_alg.h @@ -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 { diff --git a/include/uapi/linux/if_alg.h b/include/uapi/linux/if_alg.h index 0f9acce..f2acd2f 100644 --- a/include/uapi/linux/if_alg.h +++ b/include/uapi/linux/if_alg.h @@ -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 -- 2.1.0