Add a CMAC test

We did not have a test of the low level CMAC APIs so we add one. This is
heavily based on the HMAC test.

Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/11972)

1 files changed, 216 insertions, 0 deletions

diff --git a/test/cmactest.c b/test/cmactest.c
new file mode 100644
index 0000000000..cb2b273b0f
--- /dev/null
+++ b/test/cmactest.c
@@ -0,0 +1,216 @@
+/*
+ * Copyright 1995-2020 The OpenSSL Project Authors. All Rights Reserved.
+ *
+ * Licensed under the Apache License 2.0 (the "License").  You may not use
+ * this file except in compliance with the License.  You can obtain a copy
+ * in the file LICENSE in the source distribution or at
+ * https://www.openssl.org/source/license.html
+ */
+
+/*
+ * CMAC low level APIs are deprecated for public use, but still ok for internal
+ * use.
+ */
+#include "internal/deprecated.h"
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+
+#include "internal/nelem.h"
+
+#include <openssl/cmac.h>
+#include <openssl/aes.h>
+#include <openssl/evp.h>
+
+#include "testutil.h"
+
+static const char xtskey[32] = {
+    0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b,
+    0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
+    0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f
+};
+
+static struct test_st {
+    const char key[32];
+    int key_len;
+    const unsigned char data[64];
+    int data_len;
+    const char *mac;
+} test[3] = {
+    {
+        {
+            0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a,
+            0x0b, 0x0c, 0x0d, 0x0e, 0x0f
+        },
+        16,
+        "My test data",
+        12,
+        "29cec977c48f63c200bd5c4a6881b224"
+    },
+    {
+        {
+            0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a,
+            0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15,
+            0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f
+        },
+        32,
+        "My test data",
+        12,
+        "db6493aa04e4761f473b2b453c031c9a"
+    },
+    {
+        {
+            0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a,
+            0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15,
+            0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f
+        },
+        32,
+        "My test data again",
+        18,
+        "65c11c75ecf590badd0a5e56cbb8af60"
+    },
+};
+
+static char *pt(unsigned char *md, unsigned int len);
+
+static int test_cmac_bad(void)
+{
+    CMAC_CTX *ctx = NULL;
+    int ret = 0;
+
+    ctx = CMAC_CTX_new();
+    if (!TEST_ptr(ctx)
+        || !TEST_false(CMAC_Init(ctx, NULL, 0, NULL, NULL))
+        || !TEST_false(CMAC_Update(ctx, test[0].data, test[0].data_len))
+           /* Should be able to pass cipher first, and then key */
+        || !TEST_true(CMAC_Init(ctx, NULL, 0, EVP_aes_128_cbc(), NULL))
+           /* Must have a key */
+        || !TEST_false(CMAC_Update(ctx, test[0].data, test[0].data_len))
+           /* Now supply the key */
+        || !TEST_true(CMAC_Init(ctx, test[0].key, test[0].key_len, NULL, NULL))
+           /* Update should now work */
+        || !TEST_true(CMAC_Update(ctx, test[0].data, test[0].data_len))
+           /* XTS is not a suitable cipher to use */
+        || !TEST_false(CMAC_Init(ctx, xtskey, sizeof(xtskey), EVP_aes_128_xts(),
+                                 NULL))
+        || !TEST_false(CMAC_Update(ctx, test[0].data, test[0].data_len)))
+        goto err;
+
+    ret = 1;
+err:
+    CMAC_CTX_free(ctx);
+    return ret;
+}
+
+static int test_cmac_run(void)
+{
+    char *p;
+    CMAC_CTX *ctx = NULL;
+    unsigned char buf[AES_BLOCK_SIZE];
+    size_t len;
+    int ret = 0;
+
+    ctx = CMAC_CTX_new();
+
+    if (!TEST_true(CMAC_Init(ctx, test[0].key, test[0].key_len,
+                             EVP_aes_128_cbc(), NULL))
+        || !TEST_true(CMAC_Update(ctx, test[0].data, test[0].data_len))
+        || !TEST_true(CMAC_Final(ctx, buf, &len)))
+        goto err;
+
+    p = pt(buf, len);
+    if (!TEST_str_eq(p, test[0].mac))
+        goto err;
+
+    if (!TEST_true(CMAC_Init(ctx, test[1].key, test[1].key_len,
+                             EVP_aes_256_cbc(), NULL))
+        || !TEST_true(CMAC_Update(ctx, test[1].data, test[1].data_len))
+        || !TEST_true(CMAC_Final(ctx, buf, &len)))
+        goto err;
+
+    p = pt(buf, len);
+    if (!TEST_str_eq(p, test[1].mac))
+        goto err;
+
+    if (!TEST_true(CMAC_Init(ctx, test[2].key, test[2].key_len, NULL, NULL))
+        || !TEST_true(CMAC_Update(ctx, test[2].data, test[2].data_len))
+        || !TEST_true(CMAC_Final(ctx, buf, &len)))
+        goto err;
+    p = pt(buf, len);
+    if (!TEST_str_eq(p, test[2].mac))
+        goto err;
+    /* Test reusing a key */
+    if (!TEST_true(CMAC_Init(ctx, NULL, 0, NULL, NULL))
+        || !TEST_true(CMAC_Update(ctx, test[2].data, test[2].data_len))
+        || !TEST_true(CMAC_Final(ctx, buf, &len)))
+        goto err;
+    p = pt(buf, len);
+    if (!TEST_str_eq(p, test[2].mac))
+        goto err;
+
+    /* Test setting the cipher and key separately */
+    if (!TEST_true(CMAC_Init(ctx, NULL, 0, EVP_aes_256_cbc(), NULL))
+        || !TEST_true(CMAC_Init(ctx, test[2].key, test[2].key_len, NULL, NULL))
+        || !TEST_true(CMAC_Update(ctx, test[2].data, test[2].data_len))
+        || !TEST_true(CMAC_Final(ctx, buf, &len)))
+        goto err;
+    p = pt(buf, len);
+    if (!TEST_str_eq(p, test[2].mac))
+        goto err;
+
+    ret = 1;
+err:
+    CMAC_CTX_free(ctx);
+    return ret;
+}
+
+static int test_cmac_copy(void)
+{
+    char *p;
+    CMAC_CTX *ctx = NULL, *ctx2 = NULL;
+    unsigned char buf[AES_BLOCK_SIZE];
+    size_t len;
+    int ret = 0;
+
+    ctx = CMAC_CTX_new();
+    ctx2 = CMAC_CTX_new();
+    if (!TEST_ptr(ctx) || !TEST_ptr(ctx2))
+        goto err;
+
+    if (!TEST_true(CMAC_Init(ctx, test[0].key, test[0].key_len,
+                             EVP_aes_128_cbc(), NULL))
+        || !TEST_true(CMAC_Update(ctx, test[0].data, test[0].data_len))
+        || !TEST_true(CMAC_CTX_copy(ctx2, ctx))
+        || !TEST_true(CMAC_Final(ctx2, buf, &len)))
+        goto err;
+
+    p = pt(buf, len);
+    if (!TEST_str_eq(p, test[0].mac))
+        goto err;
+
+    ret = 1;
+err:
+    CMAC_CTX_free(ctx2);
+    CMAC_CTX_free(ctx);
+    return ret;
+}
+
+static char *pt(unsigned char *md, unsigned int len)
+{
+    unsigned int i;
+    static char buf[80];
+
+    for (i = 0; i < len; i++)
+        sprintf(&(buf[i * 2]), "%02x", md[i]);
+    return buf;
+}
+
+int setup_tests(void)
+{
+    ADD_TEST(test_cmac_bad);
+    ADD_TEST(test_cmac_run);
+    ADD_TEST(test_cmac_copy);
+    return 1;
+}
+