/*

 *  FIPS-180-1 compliant SHA-1 implementation

 *

 *  Copyright The Mbed TLS Contributors

 *  SPDX-License-Identifier: Apache-2.0

 *

 *  Licensed 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.

 */

/*

 *  The SHA-1 standard was published by NIST in 1993.

 *

 *  http://www.itl.nist.gov/fipspubs/fip180-1.htm

 */

#include "common.h"

#if defined(MBEDTLS_SHA1_C)

#include "mbedtls/sha1.h"

#include "mbedtls/platform_util.h"

#include "mbedtls/error.h"

#include <string.h>

#include "mbedtls/platform.h"

#if !defined(MBEDTLS_SHA1_ALT)

void mbedtls_sha1_init(mbedtls_sha1_context *ctx)

{

    memset(ctx, 0, sizeof(mbedtls_sha1_context));

}

void mbedtls_sha1_free(mbedtls_sha1_context *ctx)

{

    if (ctx == NULL) {

        return;

    }

    mbedtls_platform_zeroize(ctx, sizeof(mbedtls_sha1_context));

}

void mbedtls_sha1_clone(mbedtls_sha1_context *dst,

                        const mbedtls_sha1_context *src)

{

    *dst = *src;

}

/*

 * SHA-1 context setup

 */

int mbedtls_sha1_starts(mbedtls_sha1_context *ctx)

{

    ctx->total[0] = 0;

    ctx->total[1] = 0;

    ctx->state[0] = 0x67452301;

    ctx->state[1] = 0xEFCDAB89;

    ctx->state[2] = 0x98BADCFE;

    ctx->state[3] = 0x10325476;

    ctx->state[4] = 0xC3D2E1F0;

    return 0;

}

#if !defined(MBEDTLS_SHA1_PROCESS_ALT)

int mbedtls_internal_sha1_process(mbedtls_sha1_context *ctx,

                                  const unsigned char data[64])

{

    struct {

        uint32_t temp, W[16], A, B, C, D, E;

    } local;

    local.W[0] = MBEDTLS_GET_UINT32_BE(data,  0);

    local.W[1] = MBEDTLS_GET_UINT32_BE(data,  4);

    local.W[2] = MBEDTLS_GET_UINT32_BE(data,  8);

    local.W[3] = MBEDTLS_GET_UINT32_BE(data, 12);

    local.W[4] = MBEDTLS_GET_UINT32_BE(data, 16);

    local.W[5] = MBEDTLS_GET_UINT32_BE(data, 20);

    local.W[6] = MBEDTLS_GET_UINT32_BE(data, 24);

    local.W[7] = MBEDTLS_GET_UINT32_BE(data, 28);

    local.W[8] = MBEDTLS_GET_UINT32_BE(data, 32);

    local.W[9] = MBEDTLS_GET_UINT32_BE(data, 36);

    local.W[10] = MBEDTLS_GET_UINT32_BE(data, 40);

    local.W[11] = MBEDTLS_GET_UINT32_BE(data, 44);

    local.W[12] = MBEDTLS_GET_UINT32_BE(data, 48);

    local.W[13] = MBEDTLS_GET_UINT32_BE(data, 52);

    local.W[14] = MBEDTLS_GET_UINT32_BE(data, 56);

    local.W[15] = MBEDTLS_GET_UINT32_BE(data, 60);

#define S(x, n) (((x) << (n)) | (((x) & 0xFFFFFFFF) >> (32 - (n))))

#define R(t)                                                    \

    (                                                           \

        local.temp = local.W[((t) -  3) & 0x0F] ^             \

                     local.W[((t) -  8) & 0x0F] ^             \

                     local.W[((t) - 14) & 0x0F] ^             \

                     local.W[(t)        & 0x0F],              \

        (local.W[(t) & 0x0F] = S(local.temp, 1))               \

    )

#define P(a, b, c, d, e, x)                                          \

    do                                                          \

    {                                                           \

        (e) += S((a), 5) + F((b), (c), (d)) + K + (x);             \

        (b) = S((b), 30);                                        \

    } while (0)

    local.A = ctx->state[0];

    local.B = ctx->state[1];

    local.C = ctx->state[2];

    local.D = ctx->state[3];

    local.E = ctx->state[4];

#define F(x, y, z) ((z) ^ ((x) & ((y) ^ (z))))

#define K 0x5A827999

    P(local.A, local.B, local.C, local.D, local.E, local.W[0]);

    P(local.E, local.A, local.B, local.C, local.D, local.W[1]);

    P(local.D, local.E, local.A, local.B, local.C, local.W[2]);

    P(local.C, local.D, local.E, local.A, local.B, local.W[3]);

    P(local.B, local.C, local.D, local.E, local.A, local.W[4]);

    P(local.A, local.B, local.C, local.D, local.E, local.W[5]);

    P(local.E, local.A, local.B, local.C, local.D, local.W[6]);

    P(local.D, local.E, local.A, local.B, local.C, local.W[7]);

    P(local.C, local.D, local.E, local.A, local.B, local.W[8]);

    P(local.B, local.C, local.D, local.E, local.A, local.W[9]);

    P(local.A, local.B, local.C, local.D, local.E, local.W[10]);

    P(local.E, local.A, local.B, local.C, local.D, local.W[11]);

    P(local.D, local.E, local.A, local.B, local.C, local.W[12]);

    P(local.C, local.D, local.E, local.A, local.B, local.W[13]);

    P(local.B, local.C, local.D, local.E, local.A, local.W[14]);

    P(local.A, local.B, local.C, local.D, local.E, local.W[15]);

    P(local.E, local.A, local.B, local.C, local.D, R(16));

    P(local.D, local.E, local.A, local.B, local.C, R(17));

    P(local.C, local.D, local.E, local.A, local.B, R(18));

    P(local.B, local.C, local.D, local.E, local.A, R(19));

#undef K

#undef F

#define F(x, y, z) ((x) ^ (y) ^ (z))

#define K 0x6ED9EBA1

    P(local.A, local.B, local.C, local.D, local.E, R(20));

    P(local.E, local.A, local.B, local.C, local.D, R(21));

    P(local.D, local.E, local.A, local.B, local.C, R(22));

    P(local.C, local.D, local.E, local.A, local.B, R(23));

    P(local.B, local.C, local.D, local.E, local.A, R(24));

    P(local.A, local.B, local.C, local.D, local.E, R(25));

    P(local.E, local.A, local.B, local.C, local.D, R(26));

    P(local.D, local.E, local.A, local.B, local.C, R(27));

    P(local.C, local.D, local.E, local.A, local.B, R(28));

    P(local.B, local.C, local.D, local.E, local.A, R(29));

    P(local.A, local.B, local.C, local.D, local.E, R(30));

    P(local.E, local.A, local.B, local.C, local.D, R(31));

    P(local.D, local.E, local.A, local.B, local.C, R(32));

    P(local.C, local.D, local.E, local.A, local.B, R(33));

    P(local.B, local.C, local.D, local.E, local.A, R(34));

    P(local.A, local.B, local.C, local.D, local.E, R(35));

    P(local.E, local.A, local.B, local.C, local.D, R(36));

    P(local.D, local.E, local.A, local.B, local.C, R(37));

    P(local.C, local.D, local.E, local.A, local.B, R(38));

    P(local.B, local.C, local.D, local.E, local.A, R(39));

#undef K

#undef F

#define F(x, y, z) (((x) & (y)) | ((z) & ((x) | (y))))

#define K 0x8F1BBCDC

    P(local.A, local.B, local.C, local.D, local.E, R(40));

    P(local.E, local.A, local.B, local.C, local.D, R(41));

    P(local.D, local.E, local.A, local.B, local.C, R(42));

    P(local.C, local.D, local.E, local.A, local.B, R(43));

    P(local.B, local.C, local.D, local.E, local.A, R(44));

    P(local.A, local.B, local.C, local.D, local.E, R(45));

    P(local.E, local.A, local.B, local.C, local.D, R(46));

    P(local.D, local.E, local.A, local.B, local.C, R(47));

    P(local.C, local.D, local.E, local.A, local.B, R(48));

    P(local.B, local.C, local.D, local.E, local.A, R(49));

    P(local.A, local.B, local.C, local.D, local.E, R(50));

    P(local.E, local.A, local.B, local.C, local.D, R(51));

    P(local.D, local.E, local.A, local.B, local.C, R(52));

    P(local.C, local.D, local.E, local.A, local.B, R(53));

    P(local.B, local.C, local.D, local.E, local.A, R(54));

    P(local.A, local.B, local.C, local.D, local.E, R(55));

    P(local.E, local.A, local.B, local.C, local.D, R(56));

    P(local.D, local.E, local.A, local.B, local.C, R(57));

    P(local.C, local.D, local.E, local.A, local.B, R(58));

    P(local.B, local.C, local.D, local.E, local.A, R(59));

#undef K

#undef F

#define F(x, y, z) ((x) ^ (y) ^ (z))

#define K 0xCA62C1D6

    P(local.A, local.B, local.C, local.D, local.E, R(60));

    P(local.E, local.A, local.B, local.C, local.D, R(61));

    P(local.D, local.E, local.A, local.B, local.C, R(62));

    P(local.C, local.D, local.E, local.A, local.B, R(63));

    P(local.B, local.C, local.D, local.E, local.A, R(64));

    P(local.A, local.B, local.C, local.D, local.E, R(65));

    P(local.E, local.A, local.B, local.C, local.D, R(66));

    P(local.D, local.E, local.A, local.B, local.C, R(67));

    P(local.C, local.D, local.E, local.A, local.B, R(68));

    P(local.B, local.C, local.D, local.E, local.A, R(69));

    P(local.A, local.B, local.C, local.D, local.E, R(70));

    P(local.E, local.A, local.B, local.C, local.D, R(71));

    P(local.D, local.E, local.A, local.B, local.C, R(72));

    P(local.C, local.D, local.E, local.A, local.B, R(73));

    P(local.B, local.C, local.D, local.E, local.A, R(74));

    P(local.A, local.B, local.C, local.D, local.E, R(75));

    P(local.E, local.A, local.B, local.C, local.D, R(76));

    P(local.D, local.E, local.A, local.B, local.C, R(77));

    P(local.C, local.D, local.E, local.A, local.B, R(78));

    P(local.B, local.C, local.D, local.E, local.A, R(79));

#undef K

#undef F

    ctx->state[0] += local.A;

    ctx->state[1] += local.B;

    ctx->state[2] += local.C;

    ctx->state[3] += local.D;

    ctx->state[4] += local.E;

    /* Zeroise buffers and variables to clear sensitive data from memory. */

    mbedtls_platform_zeroize(&local, sizeof(local));

    return 0;

}

#endif /* !MBEDTLS_SHA1_PROCESS_ALT */

/*

 * SHA-1 process buffer

 */

int mbedtls_sha1_update(mbedtls_sha1_context *ctx,

                        const unsigned char *input,

                        size_t ilen)

{

    int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;

    size_t fill;

    uint32_t left;

    if (ilen == 0) {

        return 0;

    }

    left = ctx->total[0] & 0x3F;

    fill = 64 - left;

    ctx->total[0] += (uint32_t) ilen;

    ctx->total[0] &= 0xFFFFFFFF;

    if (ctx->total[0] < (uint32_t) ilen) {

        ctx->total[1]++;

    }

    if (left && ilen >= fill) {

        memcpy((void *) (ctx->buffer + left), input, fill);

        if ((ret = mbedtls_internal_sha1_process(ctx, ctx->buffer)) != 0) {

            return ret;

        }

        input += fill;

        ilen  -= fill;

        left = 0;

    }

    while (ilen >= 64) {

        if ((ret = mbedtls_internal_sha1_process(ctx, input)) != 0) {

            return ret;

        }

        input += 64;

        ilen  -= 64;

    }

    if (ilen > 0) {

        memcpy((void *) (ctx->buffer + left), input, ilen);

    }

    return 0;

}

/*

 * SHA-1 final digest

 */

int mbedtls_sha1_finish(mbedtls_sha1_context *ctx,

                        unsigned char output[20])

{

    int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;

    uint32_t used;

    uint32_t high, low;

    /*

     * Add padding: 0x80 then 0x00 until 8 bytes remain for the length

     */

    used = ctx->total[0] & 0x3F;

    ctx->buffer[used++] = 0x80;

    if (used <= 56) {

        /* Enough room for padding + length in current block */

        memset(ctx->buffer + used, 0, 56 - used);

    } else {

        /* We'll need an extra block */

        memset(ctx->buffer + used, 0, 64 - used);

        if ((ret = mbedtls_internal_sha1_process(ctx, ctx->buffer)) != 0) {

            return ret;

        }

        memset(ctx->buffer, 0, 56);

    }

    /*

     * Add message length

     */

    high = (ctx->total[0] >> 29)

           | (ctx->total[1] <<  3);

    low  = (ctx->total[0] <<  3);

    MBEDTLS_PUT_UINT32_BE(high, ctx->buffer, 56);

    MBEDTLS_PUT_UINT32_BE(low,  ctx->buffer, 60);

    if ((ret = mbedtls_internal_sha1_process(ctx, ctx->buffer)) != 0) {

        return ret;

    }

    /*

     * Output final state

     */

    MBEDTLS_PUT_UINT32_BE(ctx->state[0], output,  0);

    MBEDTLS_PUT_UINT32_BE(ctx->state[1], output,  4);

    MBEDTLS_PUT_UINT32_BE(ctx->state[2], output,  8);

    MBEDTLS_PUT_UINT32_BE(ctx->state[3], output, 12);

    MBEDTLS_PUT_UINT32_BE(ctx->state[4], output, 16);

    return 0;

}

#endif /* !MBEDTLS_SHA1_ALT */

/*

 * output = SHA-1( input buffer )

 */

int mbedtls_sha1(const unsigned char *input,

                 size_t ilen,

                 unsigned char output[20])

{

    int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;

    mbedtls_sha1_context ctx;

    mbedtls_sha1_init(&ctx);

    if ((ret = mbedtls_sha1_starts(&ctx)) != 0) {

        goto exit;

    }

    if ((ret = mbedtls_sha1_update(&ctx, input, ilen)) != 0) {

        goto exit;

    }

    if ((ret = mbedtls_sha1_finish(&ctx, output)) != 0) {

        goto exit;

    }

exit:

    mbedtls_sha1_free(&ctx);

    return ret;

}

#if defined(MBEDTLS_SELF_TEST)

/*

 * FIPS-180-1 test vectors

 */

static const unsigned char sha1_test_buf[3][57] =

{

    { "abc" },

    { "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq" },

    { "" }

};

static const size_t sha1_test_buflen[3] =

{

    3, 56, 1000

};

static const unsigned char sha1_test_sum[3][20] =

{

    { 0xA9, 0x99, 0x3E, 0x36, 0x47, 0x06, 0x81, 0x6A, 0xBA, 0x3E,

      0x25, 0x71, 0x78, 0x50, 0xC2, 0x6C, 0x9C, 0xD0, 0xD8, 0x9D },

    { 0x84, 0x98, 0x3E, 0x44, 0x1C, 0x3B, 0xD2, 0x6E, 0xBA, 0xAE,

      0x4A, 0xA1, 0xF9, 0x51, 0x29, 0xE5, 0xE5, 0x46, 0x70, 0xF1 },

    { 0x34, 0xAA, 0x97, 0x3C, 0xD4, 0xC4, 0xDA, 0xA4, 0xF6, 0x1E,

      0xEB, 0x2B, 0xDB, 0xAD, 0x27, 0x31, 0x65, 0x34, 0x01, 0x6F }

};

/*

 * Checkup routine

 */

int mbedtls_sha1_self_test(int verbose)

{

    int i, j, buflen, ret = 0;

    unsigned char buf[1024];

    unsigned char sha1sum[20];

    mbedtls_sha1_context ctx;

    mbedtls_sha1_init(&ctx);

    /*

     * SHA-1

     */

    for (i = 0; i < 3; i++) {

        if (verbose != 0) {

            mbedtls_printf("  SHA-1 test #%d: ", i + 1);

        }

        if ((ret = mbedtls_sha1_starts(&ctx)) != 0) {

            goto fail;

        }

        if (i == 2) {

            memset(buf, 'a', buflen = 1000);

            for (j = 0; j < 1000; j++) {

                ret = mbedtls_sha1_update(&ctx, buf, buflen);

                if (ret != 0) {

                    goto fail;

                }

            }

        } else {

            ret = mbedtls_sha1_update(&ctx, sha1_test_buf[i],

                                      sha1_test_buflen[i]);

            if (ret != 0) {

                goto fail;

            }

        }

        if ((ret = mbedtls_sha1_finish(&ctx, sha1sum)) != 0) {

            goto fail;

        }

        if (memcmp(sha1sum, sha1_test_sum[i], 20) != 0) {

            ret = 1;

            goto fail;

        }

        if (verbose != 0) {

            mbedtls_printf("passed\n");

        }

    }

    if (verbose != 0) {

        mbedtls_printf("\n");

    }

    goto exit;

fail:

    if (verbose != 0) {

        mbedtls_printf("failed\n");

    }

exit:

    mbedtls_sha1_free(&ctx);

    return ret;

}

#endif /* MBEDTLS_SELF_TEST */

#endif /* MBEDTLS_SHA1_C */