Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755255Ab2HOSnc (ORCPT ); Wed, 15 Aug 2012 14:43:32 -0400 Received: from mga05.intel.com ([192.55.52.89]:48176 "EHLO fmsmga101.fm.intel.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1754928Ab2HOSn3 (ORCPT ); Wed, 15 Aug 2012 14:43:29 -0400 From: Dmitry Kasatkin To: zohar@linux.vnet.ibm.com, jmorris@namei.org, rusty@rustcorp.com.au, dhowells@redhat.com, linux-security-module@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [RFC v2 1/7] integrity: added digest calculation function Date: Wed, 15 Aug 2012 21:43:06 +0300 Message-Id: X-Mailer: git-send-email 1.7.9.5 In-Reply-To: References: In-Reply-To: References: Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2597 Lines: 86 There are several functions, that need to calculate digest. This patch adds common function for use by integrity subsystem. Signed-off-by: Dmitry Kasatkin --- security/integrity/digsig.c | 31 +++++++++++++++++++++++++++++-- security/integrity/integrity.h | 3 +++ 2 files changed, 32 insertions(+), 2 deletions(-) diff --git a/security/integrity/digsig.c b/security/integrity/digsig.c index 2dc167d..61a0c92 100644 --- a/security/integrity/digsig.c +++ b/security/integrity/digsig.c @@ -13,9 +13,9 @@ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include -#include #include #include +#include #include "integrity.h" @@ -28,7 +28,7 @@ static const char *keyring_name[INTEGRITY_KEYRING_MAX] = { }; int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen, - const char *digest, int digestlen) + const char *digest, int digestlen) { if (id >= INTEGRITY_KEYRING_MAX) return -EINVAL; @@ -46,3 +46,30 @@ int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen, return digsig_verify(keyring[id], sig, siglen, digest, digestlen); } + +int integrity_calc_digest(const char *algo, const void *data, const int len, + char *digest) +{ + int rc = -ENOMEM; + struct crypto_shash *tfm; + + tfm = crypto_alloc_shash(algo, 0, 0); + if (IS_ERR(tfm)) { + rc = PTR_ERR(tfm); + pr_err("Can not allocate %s (reason: %d)\n", algo, rc); + return rc; + } else { + struct { + struct shash_desc shash; + char ctx[crypto_shash_descsize(tfm)]; + } desc; + + desc.shash.tfm = tfm; + desc.shash.flags = 0; + + rc = crypto_shash_digest(&desc.shash, data, len, digest); + } + + crypto_free_shash(tfm); + return rc; +} diff --git a/security/integrity/integrity.h b/security/integrity/integrity.h index e21362a..48ee2d4 100644 --- a/security/integrity/integrity.h +++ b/security/integrity/integrity.h @@ -59,6 +59,9 @@ struct integrity_iint_cache *integrity_iint_find(struct inode *inode); #ifdef CONFIG_INTEGRITY_SIGNATURE +int integrity_calc_digest(const char *algo, const void *data, const int len, + char *digest); + int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen, const char *digest, int digestlen); -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/