X-Git-Url: http://wagner.pp.ru/gitweb/?a=blobdiff_plain;f=gost_omac.c;h=e78fd9d7c5de76e3e7b00c80e7a18a1e5b26eeb9;hb=75796d263c62a57a330f596d4a03d9ed22ec9f74;hp=af6eb2a9e9e6e9cf2260754db5c7b147b2c912d8;hpb=636dd0c1f36872f0abcb4f8a465e837929ed19d1;p=openssl-gost%2Fengine.git

diff --git a/gost_omac.c b/gost_omac.c
index af6eb2a..e78fd9d 100644
--- a/gost_omac.c
+++ b/gost_omac.c
@@ -7,6 +7,8 @@
 #include "e_gost_err.h"
 #include "gost_lcl.h"
 
+#define min(a,b) (((a) < (b)) ? (a) : (b))
+
 typedef struct omac_ctx {
 	CMAC_CTX *cmac_ctx;
 	size_t   dgst_size;
@@ -71,7 +73,8 @@ int omac_imit_final(EVP_MD_CTX *ctx, unsigned char *md)
 
 		CMAC_Final(c->cmac_ctx, mac, &mac_size);
 
-    memcpy(md, mac, c->dgst_size);
+    int md_size = EVP_MD_meth_get_result_size(EVP_MD_CTX_md(ctx));
+    memcpy(md, mac, min(md_size, c->dgst_size));
     return 1;
 }
 
@@ -89,6 +92,13 @@ int omac_imit_copy(EVP_MD_CTX *to, const EVP_MD_CTX *from)
 		{
 			return 0;
 		}
+                if (!c_from->cmac_ctx) {
+                    if (c_to->cmac_ctx) {
+                        CMAC_CTX_free(c_to->cmac_ctx);
+                        c_to->cmac_ctx = NULL;
+                    }
+                    return 1;
+                }
 		if (c_to->cmac_ctx == c_from->cmac_ctx)
 		{
 		    c_to->cmac_ctx = CMAC_CTX_new();