fix cbmc

tests/cbmc/proofs/s2n_hmac_is_available/Makefile

@@ -22,6 +22,7 @@ HARNESS_FILE = $(HARNESS_ENTRY).c
 PROOF_SOURCES += $(PROOFDIR)/$(HARNESS_FILE)
 PROOF_SOURCES += $(PROOF_STUB)/s2n_calculate_stacktrace.c
 PROOF_SOURCES += $(PROOF_STUB)/s2n_is_in_fips_mode.c
+PROOF_SOURCES += $(PROOF_STUB)/s2n_libcrypto_is_awslc.c
 
 PROJECT_SOURCES += $(SRCDIR)/crypto/s2n_hmac.c
 

tests/cbmc/proofs/s2n_hmac_is_available/s2n_hmac_is_available_harness.c

@@ -17,6 +17,7 @@
 
 #include "crypto/s2n_fips.h"
 #include "crypto/s2n_hmac.h"
+#include "crypto/s2n_openssl.h"
 
 #include <assert.h>
 
@@ -33,7 +34,7 @@ void s2n_hmac_is_available_harness()
         case S2N_HASH_MD5:
         case S2N_HMAC_SSLv3_MD5:
         case S2N_HMAC_SSLv3_SHA1:
-            assert(is_available == !s2n_is_in_fips_mode()); break;
+            assert(is_available == !s2n_is_in_fips_mode() || s2n_libcrypto_is_awslc()); break;
         case S2N_HASH_NONE:
         case S2N_HASH_SHA1:
         case S2N_HASH_SHA224:

tests/cbmc/stubs/s2n_libcrypto_is_awslc.c

@@ -0,0 +1,30 @@
+/*
+* Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+*
+* Licensed under the Apache License, Version 2.0 (the "License"). You may not use
+* this file except in compliance with the License. A copy of the License is
+* located at
+*
+*     http://aws.amazon.com/apache2.0/
+*
+* or in the "license" file accompanying this file. This file is distributed on an
+* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+* implied. See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+#include <cbmc_proof/nondet.h>
+
+#include "crypto/s2n_openssl.h"
+
+static int flag = 0;
+static int s2n_awslc_flag = 0;
+
+int s2n_libcrypto_is_awslc()
+{
+   if (flag == 0) {
+       s2n_awslc_flag = nondet_bool() ? 1 : 0;
+       flag = 1;
+   }
+   return s2n_awslc_flag;
+}