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Subject[RFC v2 1/7] integrity: added digest calculation function
Date
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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