crypto/mbedtls: Add unit test for mynewt GCM

This adds unit test for additional mynewt GCM related APIs

Author: m-gorecki

crypto/mbedtls/selftest/src/mbedtls_test.c

@@ -85,6 +85,7 @@ TEST_CASE_DECL(sha512_test)
 TEST_CASE_DECL(timing_test)
 TEST_CASE_DECL(x509_test)
 TEST_CASE_DECL(xtea_test)
+TEST_CASE_DECL(gcm_mynewt_test)
 
 TEST_SUITE(mbedtls_test_all)
 {
@@ -120,6 +121,7 @@ TEST_SUITE(mbedtls_test_all)
     timing_test();
     x509_test();
     xtea_test();
+    gcm_mynewt_test();
 }
 
 int

crypto/mbedtls/selftest/src/mbedtls_test.h

@@ -56,6 +56,7 @@
 #include "mbedtls/timing.h"
 #include "mbedtls/x509.h"
 #include "mbedtls/xtea.h"
+#include "gcm_mynewt.h"
 
 #ifdef __cplusplus
 extern "C" {

crypto/mbedtls/selftest/src/testcases/gcm_mynewt_test.c

@@ -0,0 +1,143 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License 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 "mbedtls_test.h"
+
+#define AES_BLK_SZ 16
+
+static const mbedtls_cipher_info_t *rsm_ucast_cipher;
+
+/* This contains both ADD and plaintext for encryption */
+static const uint8_t initial_data[110] = {
+    0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A,
+    0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1A,
+    0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2A,
+    0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3A,
+    0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, 0x4A,
+    0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5A,
+    0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6A,
+    0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7A,
+    0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x8A,
+    0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9A,
+    0xA1, 0xA2, 0xA3, 0xA4, 0xA5, 0xA6, 0xA7, 0xA8, 0xA9, 0xAA
+};
+
+static const uint8_t key[32] = { 0xC0, 0xCA, 0xC0, 0x1A, 0xC0, 0xCA, 0xC0,
+                                 0x1A, 0xC0, 0xCA, 0xC0, 0x1A, 0xC0, 0xCA,
+                                 0xC0, 0x1A, 0xC0, 0xCA, 0xC0, 0x1A, 0xC0,
+                                 0xCA, 0xC0, 0x1A, 0xC0, 0xCA, 0xC0, 0x1A,
+                                 0xC0, 0xCA, 0xC0, 0x1A };
+
+static const uint8_t iv[12] = { 0x0, 0x1, 0x2, 0x3, 0x4, 0x5,
+                                0x6, 0x7, 0x8, 0x9, 0xA, 0xB };
+
+static const uint8_t expected_tag[16] = { 0x05, 0x5D, 0x8E, 0xD4, 0xF9, 0x2A,
+                                          0x87, 0x87, 0x6F, 0x23, 0xF2, 0xE6,
+                                          0xF0, 0x1D, 0x6D, 0x5C };
+
+static uint8_t test_tag[16];
+static uint8_t test_buf[110];
+
+static int
+mbedtls_gcm_mynewt_test_crypt(uint8_t enc)
+{
+    int add_len = 40;
+    mbedtls_gcm_context ctx;
+    mbedtls_aes_context aes_ctx;
+    uint8_t *ptr;
+
+    uint16_t off;
+    uint16_t blklen;
+    uint16_t totlen;
+    int rc;
+
+    if (rsm_ucast_cipher == NULL) {
+        rsm_ucast_cipher = mbedtls_cipher_info_from_values(MBEDTLS_CIPHER_ID_AES,
+                                                           256, MBEDTLS_MODE_ECB);
+    }
+
+    memset(&ctx, 0, sizeof(ctx));
+    mbedtls_aes_init(&aes_ctx);
+    rc = mbedtls_gcm_setkey_noalloc(&ctx, rsm_ucast_cipher, key, &aes_ctx);
+    if (rc) {
+        goto out;
+    }
+
+    rc = mbedtls_gcm_starts(&ctx, enc == 1 ? MBEDTLS_GCM_ENCRYPT : MBEDTLS_GCM_DECRYPT,
+                            iv, sizeof(iv), NULL, 0);
+    if (rc) {
+        goto out;
+    }
+
+    off = 0;
+    totlen = 110;
+
+    while (off < totlen) {
+        ptr = test_buf + off;
+        blklen = sizeof(test_buf) - off;
+        if (blklen < AES_BLK_SZ) {
+            blklen = AES_BLK_SZ;
+        } else {
+            blklen &= ~(AES_BLK_SZ - 1);
+        }
+        if (off < add_len) {
+            if (blklen + off > add_len) {
+                blklen = add_len - off;
+            }
+        } else {
+            if (blklen + off > totlen) {
+                blklen = totlen - off;
+            }
+        }
+
+        if (off < add_len) {
+            mbedtls_gcm_update_add(&ctx, blklen, ptr);
+        } else {
+            rc = mbedtls_gcm_update(&ctx, blklen, ptr, ptr);
+            if (rc) {
+                goto out;
+            }
+        }
+
+        off += blklen;
+    }
+
+    rc = mbedtls_gcm_finish(&ctx, test_tag, sizeof(test_tag));
+out:
+    memset(&ctx, 0, sizeof(ctx));
+    mbedtls_aes_free(&aes_ctx);
+    if (rc) {
+        return 1;
+    }
+    return 0;
+}
+
+TEST_CASE_SELF(gcm_mynewt_test)
+{
+    int rc;
+
+    memcpy(test_buf, initial_data, sizeof(initial_data));
+
+    rc = mbedtls_gcm_mynewt_test_crypt(1);
+    TEST_ASSERT(rc == 0);
+
+    rc = mbedtls_gcm_mynewt_test_crypt(0);
+    TEST_ASSERT(rc == 0);
+    TEST_ASSERT(memcmp(test_tag, expected_tag, sizeof(test_tag)) == 0);
+    TEST_ASSERT(memcmp(test_buf, initial_data, sizeof(test_buf)) == 0);
+}