GOST CMS encryption implementation.

[openssl-gost/engine.git] / gost_crypt.c

diff --git a/gost_crypt.c b/gost_crypt.c
index 54b4d9517324975bbcc1926ce2ed03083f0f4607..ffb577db84dbae00eee4d700dc1b11c336faf8ed 100644 (file)
--- a/gost_crypt.c
+++ b/gost_crypt.c
@@ -489,6 +489,8 @@ const struct gost_cipher_info *get_encryption_params(ASN1_OBJECT *obj)
         if (nid == NID_undef) {
             GOSTerr(GOST_F_GET_ENCRYPTION_PARAMS,
                     GOST_R_INVALID_CIPHER_PARAM_OID);
+            ERR_add_error_data(3, "Unsupported CRYPT_PARAMS='",
+                params, "' specified in environment or in config");
             return NULL;
         }
     } else {
@@ -600,7 +602,13 @@ int magma_cipher_init(EVP_CIPHER_CTX *ctx, const unsigned char *key,
         if (!gost_cipher_set_param(c, NID_id_tc26_gost_28147_param_Z))
             return 0;
         EVP_CIPHER_CTX_set_app_data(ctx, EVP_CIPHER_CTX_get_cipher_data(ctx));
+
+        if (enc) {
+            if (init_zero_kdf_seed(c->kdf_seed) == 0)
+                return -1;
+        }
     }
+
     if (key)
         magma_key(&(c->cctx), key);
     if (iv) {
@@ -626,41 +634,24 @@ int magma_cipher_init_ctr_acpkm_omac(EVP_CIPHER_CTX *ctx, const unsigned char *k
 {
        if (key) {
     struct ossl_gost_cipher_ctx *c = EVP_CIPHER_CTX_get_cipher_data(ctx);
-               unsigned char keys[64];
-               const EVP_MD *md = EVP_get_digestbynid(NID_magma_mac);
-               EVP_PKEY *mac_key;
-
-               if (md == NULL)
-                       return 0;
-
-               if (enc) {
-                       if (RAND_bytes(c->kdf_seed, 8) != 1)
-                               return 0;
-               }
-
-               if (gost_kdftree2012_256(keys, 64, key, 32, (const unsigned char *)"kdf tree", 8, c->kdf_seed, 8, 1) <= 0)
-                       return 0;
-
+               unsigned char cipher_key[32];
                c->omac_ctx = EVP_MD_CTX_new();
-               mac_key = EVP_PKEY_new_mac_key(NID_magma_mac, NULL, keys+32, 32);
 
-               if (mac_key == NULL || c->omac_ctx == NULL) {
-                       EVP_PKEY_free(mac_key);
-                       OPENSSL_cleanse(keys, sizeof(keys));
-                       return 0;
+               if (c->omac_ctx == NULL) {
+                   GOSTerr(GOST_F_MAGMA_CIPHER_INIT_CTR_ACPKM_OMAC, ERR_R_MALLOC_FAILURE);
+                               return 0;
                }
 
-               if (EVP_DigestInit_ex(c->omac_ctx, md, NULL) <= 0 ||
-                       EVP_DigestSignInit(c->omac_ctx, NULL, md, NULL, mac_key) <= 0) {
-                       EVP_PKEY_free(mac_key);
-                       OPENSSL_cleanse(keys, sizeof(keys));
-                       return 0;
+               if (gost2015_acpkm_omac_init(NID_magma_mac, enc, key,
+                                c->omac_ctx, cipher_key, c->kdf_seed) != 1) {
+                   EVP_MD_CTX_free(c->omac_ctx);
+                               c->omac_ctx = NULL;
+                   return 0;
                }
-               EVP_PKEY_free(mac_key);
-               OPENSSL_cleanse(keys + 32, sizeof(keys) - 32);
 
-               return magma_cipher_init(ctx, keys, iv, enc);
+               return magma_cipher_init(ctx, cipher_key, iv, enc);
        }
+
        return magma_cipher_init(ctx, key, iv, enc);
 }