Messages in this thread Patch in this message | | | From | Dmitry Kasatkin <> | Subject | [RFC v2 1/7] integrity: added digest calculation function | Date | Wed, 15 Aug 2012 21:43:06 +0300 |
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There are several functions, that need to calculate digest. This patch adds common function for use by integrity subsystem.
Signed-off-by: Dmitry Kasatkin <dmitry.kasatkin@intel.com> --- 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 <linux/err.h> -#include <linux/rbtree.h> #include <linux/key-type.h> #include <linux/digsig.h> +#include <crypto/hash.h> #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
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