+ struct ossl_gost_imit_ctx *gost_imit_ctx = ctx->md_data;
+
+ if (ctx->digest->init(ctx) <= 0) {
+ GOSTerr(GOST_F_GOST_IMIT_CTRL, GOST_R_MAC_KEY_NOT_SET);
+ return 0;
+ }
+ ctx->flags |= EVP_MD_CTX_FLAG_NO_INIT;
+
+ if (arg == 0) {
+ struct gost_mac_key *key = (struct gost_mac_key*) ptr;
+ if (key->mac_param_nid != NID_undef) {
+ const struct gost_cipher_info *param = get_encryption_params(OBJ_nid2obj(key->mac_param_nid));
+ if (param == NULL)
+ {
+ GOSTerr(GOST_F_GOST_IMIT_CTRL, GOST_R_INVALID_MAC_PARAMS);
+ return 0;
+ }
+ gost_init(&(gost_imit_ctx->cctx), param->sblock);
+ }
+ gost_key(&(gost_imit_ctx->cctx), key->key);
+ gost_imit_ctx->key_set = 1;
+
+ return 1;