[PATCH v5 10/10] integrity: support EC-RDSA signatures for asymmetric_verify

[Vitaly Chikunov]

Allow to use EC-RDSA signatures for IMA by determining signature type by
the hash algorithm name. This works good for EC-RDSA since Streebog and
EC-RDSA should always be used together.

Cc: Mimi Zohar <zo...@linux.ibm.com>
Cc: Dmitry Kasatkin <dmitry.kasat...@gmail.com>
Cc: linux-integr...@vger.kernel.org
Signed-off-by: Vitaly Chikunov <v...@altlinux.org>
---
 security/integrity/digsig_asymmetric.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/security/integrity/digsig_asymmetric.c 
b/security/integrity/digsig_asymmetric.c
index d775e03fbbcc..c4a3313e0210 100644
--- a/security/integrity/digsig_asymmetric.c
+++ b/security/integrity/digsig_asymmetric.c
@@ -104,9 +104,14 @@ int asymmetric_verify(struct key *keyring, const char *sig,
 
        memset(&pks, 0, sizeof(pks));
 
-       pks.pkey_algo = "rsa";
        pks.hash_algo = hash_algo_name[hdr->hash_algo];
-       pks.encoding = "pkcs1";
+       if (!strncmp(pks.hash_algo, "streebog", 8)) {
+               pks.pkey_algo = "ecrdsa";
+               pks.encoding = "raw";
+       } else {
+               pks.pkey_algo = "rsa";
+               pks.encoding = "pkcs1";
+       }
        pks.digest = (u8 *)data;
        pks.digest_size = datalen;
        pks.s = hdr->sig;
-- 
2.11.0