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authorDmitry Kasatkin <d.kasatkin@samsung.com>2013-06-07 12:16:24 +0200
committerMimi Zohar <zohar@linux.vnet.ibm.com>2013-10-25 17:17:01 -0400
commitea593993d361748e795f5eb783a5fb5144fb2df9 (patch)
tree387915941a654ae6b23199d372c73afede8d19e1 /security/integrity/ima/ima_crypto.c
parent723326b927b675daf4223fe31d7428eca68f194b (diff)
ima: support arbitrary hash algorithms in ima_calc_buffer_hash
ima_calc_buffer_hash will be used with different hash algorithms. This patch provides support for arbitrary hash algorithms in ima_calc_buffer_hash. Signed-off-by: Dmitry Kasatkin <d.kasatkin@samsung.com> Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
Diffstat (limited to 'security/integrity/ima/ima_crypto.c')
-rw-r--r--security/integrity/ima/ima_crypto.c28
1 files changed, 22 insertions, 6 deletions
diff --git a/security/integrity/ima/ima_crypto.c b/security/integrity/ima/ima_crypto.c
index e5d3ebf18436..e2be2524a372 100644
--- a/security/integrity/ima/ima_crypto.c
+++ b/security/integrity/ima/ima_crypto.c
@@ -139,23 +139,39 @@ int ima_calc_file_hash(struct file *file, struct ima_digest_data *hash)
/*
* Calculate the hash of a given buffer
*/
-int ima_calc_buffer_hash(const void *buf, int len, struct ima_digest_data *hash)
+static int ima_calc_buffer_hash_tfm(const void *buf, int len,
+ struct ima_digest_data *hash,
+ struct crypto_shash *tfm)
{
struct {
struct shash_desc shash;
- char ctx[crypto_shash_descsize(ima_shash_tfm)];
+ char ctx[crypto_shash_descsize(tfm)];
} desc;
- desc.shash.tfm = ima_shash_tfm;
+ desc.shash.tfm = tfm;
desc.shash.flags = 0;
- /* this function uses default algo */
- hash->algo = ima_hash_algo;
- hash->length = crypto_shash_digestsize(ima_shash_tfm);
+ hash->length = crypto_shash_digestsize(tfm);
return crypto_shash_digest(&desc.shash, buf, len, hash->digest);
}
+int ima_calc_buffer_hash(const void *buf, int len, struct ima_digest_data *hash)
+{
+ struct crypto_shash *tfm;
+ int rc;
+
+ tfm = ima_alloc_tfm(hash->algo);
+ if (IS_ERR(tfm))
+ return PTR_ERR(tfm);
+
+ rc = ima_calc_buffer_hash_tfm(buf, len, hash, tfm);
+
+ ima_free_tfm(tfm);
+
+ return rc;
+}
+
static void __init ima_pcrread(int idx, u8 *pcr)
{
if (!ima_used_chip)