tests/unit/test_hkdf_sha256.cpp

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#include <openthread/config.h>

#include "test_platform.h"
#include "test_util.h"
#include "test_util.hpp"

#include "common/array.hpp"
#include "common/debug.hpp"
#include "crypto/hkdf_sha256.hpp"

namespace ot {

struct TestVector
{
    const uint8_t *mInKey;
    uint16_t       mInKeyLength;
    const uint8_t *mSalt;
    uint16_t       mSaltLength;
    const uint8_t *mInfo;
    uint16_t       mInfoLength;
    const uint8_t *mOutKey;
    uint16_t       mOutKeyLength;
};

void TestHkdfSha256(void)
{
    enum
    {
        kMaxOuttKey = 128,
        kFillByte   = 0x77,
    };

    // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
    // Test Case #1: RFC-5869 Appendix A.1
    const uint8_t kInKey1[]  = {0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b,
                                0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b};
    const uint8_t kSalt1[]   = {0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c};
    const uint8_t kInfo1[]   = {0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8, 0xf9};
    const uint8_t kOutKey1[] = {0x3c, 0xb2, 0x5f, 0x25, 0xfa, 0xac, 0xd5, 0x7a, 0x90, 0x43, 0x4f, 0x64, 0xd0, 0x36,
                                0x2f, 0x2a, 0x2d, 0x2d, 0x0a, 0x90, 0xcf, 0x1a, 0x5a, 0x4c, 0x5d, 0xb0, 0x2d, 0x56,
                                0xec, 0xc4, 0xc5, 0xbf, 0x34, 0x00, 0x72, 0x08, 0xd5, 0xb8, 0x87, 0x18, 0x58, 0x65};

    // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
    // Test Case #2: RFC-5869 Appendix A.2

    const uint8_t kInKey2[] = {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, 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29,
                               0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37,
                               0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, 0x40, 0x41, 0x42, 0x43, 0x44, 0x45,
                               0x46, 0x47, 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f};

    const uint8_t kSalt2[] = {0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d,
                              0x6e, 0x6f, 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7a, 0x7b,
                              0x7c, 0x7d, 0x7e, 0x7f, 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89,
                              0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, 0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97,
                              0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, 0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5,
                              0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf};

    const uint8_t kInfo2[] = {0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd,
                              0xbe, 0xbf, 0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xcb,
                              0xcc, 0xcd, 0xce, 0xcf, 0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9,
                              0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf, 0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7,
                              0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, 0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5,
                              0xf6, 0xf7, 0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff};

    const uint8_t kOutKey2[] = {0xb1, 0x1e, 0x39, 0x8d, 0xc8, 0x03, 0x27, 0xa1, 0xc8, 0xe7, 0xf7, 0x8c, 0x59, 0x6a,
                                0x49, 0x34, 0x4f, 0x01, 0x2e, 0xda, 0x2d, 0x4e, 0xfa, 0xd8, 0xa0, 0x50, 0xcc, 0x4c,
                                0x19, 0xaf, 0xa9, 0x7c, 0x59, 0x04, 0x5a, 0x99, 0xca, 0xc7, 0x82, 0x72, 0x71, 0xcb,
                                0x41, 0xc6, 0x5e, 0x59, 0x0e, 0x09, 0xda, 0x32, 0x75, 0x60, 0x0c, 0x2f, 0x09, 0xb8,
                                0x36, 0x77, 0x93, 0xa9, 0xac, 0xa3, 0xdb, 0x71, 0xcc, 0x30, 0xc5, 0x81, 0x79, 0xec,
                                0x3e, 0x87, 0xc1, 0x4c, 0x01, 0xd5, 0xc1, 0xf3, 0x43, 0x4f, 0x1d, 0x87};

    // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
    // Test Case #3: RFC-5869 Appendix A.3

    const uint8_t kInKey3[] = {0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b,
                               0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b};

    const uint8_t kOutKey3[] = {0x8d, 0xa4, 0xe7, 0x75, 0xa5, 0x63, 0xc1, 0x8f, 0x71, 0x5f, 0x80, 0x2a, 0x06, 0x3c,
                                0x5a, 0x31, 0xb8, 0xa1, 0x1f, 0x5c, 0x5e, 0xe1, 0x87, 0x9e, 0xc3, 0x45, 0x4e, 0x5f,
                                0x3c, 0x73, 0x8d, 0x2d, 0x9d, 0x20, 0x13, 0x95, 0xfa, 0xa4, 0xb6, 0x1a, 0x96, 0xc8};

    // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
    // Test Case #4:

    const uint8_t kInKey4[]  = {'h', 'e', 'l', 'l', 'o'};
    const uint8_t kSalt4[]   = {0x8e, 0x94, 0xef, 0x80, 0x5b, 0x93, 0xe6, 0x83, 0xff, 0x18};
    const uint8_t kOutKey4[] = {0x13, 0x48, 0x50, 0x67, 0xe2, 0x1a, 0xf1, 0x7c,
                                0x09, 0x00, 0xf7, 0x0d, 0x88, 0x5f, 0x02, 0x59};

    const TestVector kTestVectors[] = {
        {kInKey1, sizeof(kInKey1), kSalt1, sizeof(kSalt1), kInfo1, sizeof(kInfo1), kOutKey1, sizeof(kOutKey1)},
        {kInKey2, sizeof(kInKey2), kSalt2, sizeof(kSalt2), kInfo2, sizeof(kInfo2), kOutKey2, sizeof(kOutKey2)},
        {kInKey3, sizeof(kInKey3), nullptr, 0, nullptr, 0, kOutKey3, sizeof(kOutKey3)},
        {kInKey4, sizeof(kInKey4), kSalt4, sizeof(kSalt4), nullptr, 0, kOutKey4, sizeof(kOutKey4)},
    };

    otInstance *instance = testInitInstance();

    VerifyOrQuit(instance != nullptr);

    for (const TestVector *test = &kTestVectors[0]; test < GetArrayEnd(kTestVectors); test++)
    {
        Crypto::HkdfSha256 hkdf;
        uint8_t            outKey[kMaxOuttKey];
        Crypto::Key        testInputKey;

        printf("\n- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -");
        DumpBuffer("\nInput Key", test->mInKey, test->mInKeyLength);
        DumpBuffer("\nSalt", test->mSalt, test->mSaltLength);
        DumpBuffer("\nInfo", test->mInfo, test->mInfoLength);
        DumpBuffer("\nExpected Output Key", test->mOutKey, test->mOutKeyLength);

        memset(outKey, kFillByte, sizeof(outKey));
        memset(&testInputKey, 0x00, sizeof(testInputKey));
        testInputKey.mKey       = test->mInKey;
        testInputKey.mKeyLength = test->mInKeyLength;

        hkdf.Extract(test->mSalt, test->mSaltLength, testInputKey);
        hkdf.Expand(test->mInfo, test->mInfoLength, outKey, test->mOutKeyLength);

        DumpBuffer("\nCalculated Output Key", outKey, test->mOutKeyLength);

        VerifyOrQuit(memcmp(outKey, test->mOutKey, test->mOutKeyLength) == 0, "HKDF-SHA-256 failed");

        for (size_t i = test->mOutKeyLength + 1; i < sizeof(outKey); i++)
        {
            VerifyOrQuit(outKey[i] == kFillByte, "HKDF-SHA-256 wrote beyond output key length");
        }
    }

    testFreeInstance(instance);
}

} // namespace ot

int main(void)
{
    ot::TestHkdfSha256();
    printf("All tests passed\n");
    return 0;
}