// This Source Code Form is subject to the terms of the Mozilla Public

// License, v. 2.0. If a copy of the MPL was not distributed with this file,

// You can obtain one at http://mozilla.org/MPL/2.0/.

#include "gtest/gtest.h"

#include <stdint.h>

#include <memory>

#include "blapi.h"

#include "secitem.h"

#include "freebl_scoped_ptrs.h"

class CmacAesTest : public ::testing::Test {

protected:

bool Compare(const uint8_t *actual, const uint8_t *expected,

unsigned int length) {

return strncmp((const char *)actual, (const char *)expected, length) == 0;

}

};

TEST_F(CmacAesTest, CreateInvalidSize) {

uint8_t key[1] = {0x00};

ScopedCMACContext ctx(CMAC_Create(CMAC_AES, key, sizeof(key)));

ASSERT_EQ(ctx, nullptr);

}

TEST_F(CmacAesTest, CreateRightSize) {

uint8_t *key = PORT_NewArray(uint8_t, AES_128_KEY_LENGTH);

ScopedCMACContext ctx(CMAC_Create(CMAC_AES, key, AES_128_KEY_LENGTH));

ASSERT_NE(ctx, nullptr);

PORT_Free(key);

}

// The following tests were taken from NIST's Cryptographic Standards and

// Guidelines page for AES-CMAC Examples with Intermediate Values. These same

// test vectors for AES-128 can be found in RFC 4493, Section 4.

static const uint8_t kNistKeys[][AES_256_KEY_LENGTH] = {

{0x2B, 0x7E, 0x15, 0x16, 0x28, 0xAE, 0xD2, 0xA6, 0xAB, 0xF7, 0x15,

0x88, 0x09, 0xCF, 0x4F, 0x3C, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,

0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},

{0x8E, 0x73, 0xB0, 0xF7, 0xDA, 0x0E, 0x64, 0x52, 0xC8, 0x10, 0xF3,

0x2B, 0x80, 0x90, 0x79, 0xE5, 0x62, 0xF8, 0xEA, 0xD2, 0x52, 0x2C,

0x6B, 0x7B, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},

{0x60, 0x3D, 0xEB, 0x10, 0x15, 0xCA, 0x71, 0xBE, 0x2B, 0x73, 0xAE,

0xF0, 0x85, 0x7D, 0x77, 0x81, 0x1F, 0x35, 0x2C, 0x07, 0x3B, 0x61,

0x08, 0xD7, 0x2D, 0x98, 0x10, 0xA3, 0x09, 0x14, 0xDF, 0xF4}};

static const size_t kNistKeyLengthsCount = PR_ARRAY_SIZE(kNistKeys);

static const unsigned int kNistKeyLengths[kNistKeyLengthsCount] = {

AES_128_KEY_LENGTH, AES_192_KEY_LENGTH, AES_256_KEY_LENGTH};

static const uint8_t kNistPlaintext[64] = {

0x6B, 0xC1, 0xBE, 0xE2, 0x2E, 0x40, 0x9F, 0x96, 0xE9, 0x3D, 0x7E,

0x11, 0x73, 0x93, 0x17, 0x2A, 0xAE, 0x2D, 0x8A, 0x57, 0x1E, 0x03,

0xAC, 0x9C, 0x9E, 0xB7, 0x6F, 0xAC, 0x45, 0xAF, 0x8E, 0x51, 0x30,

0xC8, 0x1C, 0x46, 0xA3, 0x5C, 0xE4, 0x11, 0xE5, 0xFB, 0xC1, 0x19,

0x1A, 0x0A, 0x52, 0xEF, 0xF6, 0x9F, 0x24, 0x45, 0xDF, 0x4F, 0x9B,

0x17, 0xAD, 0x2B, 0x41, 0x7B, 0xE6, 0x6C, 0x37, 0x10};

static const unsigned int kNistPlaintextLengths[] = {0, 16, 20, 64};

static const size_t kNistPlaintextLengthsCount =

PR_ARRAY_SIZE(kNistPlaintextLengths);

// This table contains the result of a CMAC over kNistPlaintext using keys from

// kNistKeys. For each key, there are kNistPlaintextLengthsCount answers, all

// listed one after the other as the input is truncated to the different sizes

// in kNistPlaintextLengths.

static const uint8_t kNistKnown[][AES_BLOCK_SIZE] = {

{0xBB, 0x1D, 0x69, 0x29, 0xE9, 0x59, 0x37, 0x28, 0x7F, 0xA3, 0x7D, 0x12,

0x9B, 0x75, 0x67, 0x46},

{0x07, 0x0A, 0x16, 0xB4, 0x6B, 0x4D, 0x41, 0x44, 0xF7, 0x9B, 0xDD, 0x9D,

0xD0, 0x4A, 0x28, 0x7C},

{0x7D, 0x85, 0x44, 0x9E, 0xA6, 0xEA, 0x19, 0xC8, 0x23, 0xA7, 0xBF, 0x78,

0x83, 0x7D, 0xFA, 0xDE},

{0x51, 0xF0, 0xBE, 0xBF, 0x7E, 0x3B, 0x9D, 0x92, 0xFC, 0x49, 0x74, 0x17,

0x79, 0x36, 0x3C, 0xFE},

{0xD1, 0x7D, 0xDF, 0x46, 0xAD, 0xAA, 0xCD, 0xE5, 0x31, 0xCA, 0xC4, 0x83,

0xDE, 0x7A, 0x93, 0x67},

{0x9E, 0x99, 0xA7, 0xBF, 0x31, 0xE7, 0x10, 0x90, 0x06, 0x62, 0xF6, 0x5E,

0x61, 0x7C, 0x51, 0x84},

{0x3D, 0x75, 0xC1, 0x94, 0xED, 0x96, 0x07, 0x04, 0x44, 0xA9, 0xFA, 0x7E,

0xC7, 0x40, 0xEC, 0xF8},

{0xA1, 0xD5, 0xDF, 0x0E, 0xED, 0x79, 0x0F, 0x79, 0x4D, 0x77, 0x58, 0x96,

0x59, 0xF3, 0x9A, 0x11},

{0x02, 0x89, 0x62, 0xF6, 0x1B, 0x7B, 0xF8, 0x9E, 0xFC, 0x6B, 0x55, 0x1F,

0x46, 0x67, 0xD9, 0x83},

{0x28, 0xA7, 0x02, 0x3F, 0x45, 0x2E, 0x8F, 0x82, 0xBD, 0x4B, 0xF2, 0x8D,

0x8C, 0x37, 0xC3, 0x5C},

{0x15, 0x67, 0x27, 0xDC, 0x08, 0x78, 0x94, 0x4A, 0x02, 0x3C, 0x1F, 0xE0,

0x3B, 0xAD, 0x6D, 0x93},

{0xE1, 0x99, 0x21, 0x90, 0x54, 0x9F, 0x6E, 0xD5, 0x69, 0x6A, 0x2C, 0x05,

0x6C, 0x31, 0x54, 0x10}};

PR_STATIC_ASSERT(PR_ARRAY_SIZE(kNistKnown) ==

kNistKeyLengthsCount * kNistPlaintextLengthsCount);

TEST_F(CmacAesTest, AesNistAligned) {

for (unsigned int key_index = 0; key_index < kNistKeyLengthsCount;

key_index++) {

ScopedCMACContext ctx(CMAC_Create(CMAC_AES, kNistKeys[key_index],

kNistKeyLengths[key_index]));

ASSERT_NE(ctx, nullptr);

for (unsigned int plaintext_index = 0;

plaintext_index < kNistPlaintextLengthsCount; plaintext_index++) {

CMAC_Begin(ctx.get());

unsigned int known_index =

(key_index * kNistPlaintextLengthsCount) + plaintext_index;

CMAC_Update(ctx.get(), kNistPlaintext,

kNistPlaintextLengths[plaintext_index]);

uint8_t output[AES_BLOCK_SIZE];

CMAC_Finish(ctx.get(), output, NULL, AES_BLOCK_SIZE);

ASSERT_TRUE(Compare(output, kNistKnown[known_index], AES_BLOCK_SIZE));

}

}

}

TEST_F(CmacAesTest, AesNistUnaligned) {

for (unsigned int key_index = 0; key_index < kNistKeyLengthsCount;

key_index++) {

unsigned int key_length = kNistKeyLengths[key_index];

ScopedCMACContext ctx(

CMAC_Create(CMAC_AES, kNistKeys[key_index], key_length));

ASSERT_NE(ctx, nullptr);

// Skip the zero-length test.

for (unsigned int plaintext_index = 1;

plaintext_index < kNistPlaintextLengthsCount; plaintext_index++) {

unsigned int known_index =

(key_index * kNistPlaintextLengthsCount) + plaintext_index;

unsigned int plaintext_length = kNistPlaintextLengths[plaintext_index];

// Test all possible offsets and make sure that misaligned updates

// produce the desired result. That is, do two updates:

// 0 ... offset

// offset ... len - offset

// and ensure the result is the same as doing one update.

for (unsigned int offset = 1; offset < plaintext_length; offset++) {

CMAC_Begin(ctx.get());

CMAC_Update(ctx.get(), kNistPlaintext, offset);

CMAC_Update(ctx.get(), kNistPlaintext + offset,

plaintext_length - offset);

uint8_t output[AES_BLOCK_SIZE];

CMAC_Finish(ctx.get(), output, NULL, AES_BLOCK_SIZE);

ASSERT_TRUE(Compare(output, kNistKnown[known_index], AES_BLOCK_SIZE));

}

}

}

}

TEST_F(CmacAesTest, AesNistTruncated) {

for (unsigned int key_index = 0; key_index < kNistKeyLengthsCount;

key_index++) {

unsigned int key_length = kNistKeyLengths[key_index];

ScopedCMACContext ctx(

CMAC_Create(CMAC_AES, kNistKeys[key_index], key_length));

ASSERT_TRUE(ctx != nullptr);

// Skip the zero-length test.

for (unsigned int plaintext_index = 1;

plaintext_index < kNistPlaintextLengthsCount; plaintext_index++) {

unsigned int known_index =

(key_index * kNistPlaintextLengthsCount) + plaintext_index;

unsigned int plaintext_length = kNistPlaintextLengths[plaintext_index];

// Test truncated outputs to ensure that we always get the desired values.

for (unsigned int out_len = 1; out_len < AES_BLOCK_SIZE; out_len++) {

CMAC_Begin(ctx.get());

CMAC_Update(ctx.get(), kNistPlaintext, plaintext_length);

unsigned int actual_out_len = 0;

uint8_t output[AES_BLOCK_SIZE];

CMAC_Finish(ctx.get(), output, &actual_out_len, out_len);

ASSERT_TRUE(actual_out_len == out_len);

ASSERT_TRUE(Compare(output, kNistKnown[known_index], out_len));

}

}

}

}