/*
 *  FIPS-180-1 compliant SHA-1 implementation
 *
 *  Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
 *  SPDX-License-Identifier: GPL-2.0
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 *  This file is part of mbed TLS (https://tls.mbed.org)
 */
/*
 *  The SHA-1 standard was published by NIST in 1993.
 *
 *  http://www.itl.nist.gov/fipspubs/fip180-1.htm
 */

#if !defined(MBEDTLS_CONFIG_FILE)
#include "mbedtls/config.h"
#else
#include MBEDTLS_CONFIG_FILE
#endif

#if defined(MBEDTLS_SHA1_C)

#include "mbedtls/sha1.h"
#include "mbedtls/platform_util.h"

#include <string.h>

#if defined(MBEDTLS_SELF_TEST)
#if defined(MBEDTLS_PLATFORM_C)
#include "mbedtls/platform.h"
#else
#include <stdio.h>
#define mbedtls_printf printf
#endif /* MBEDTLS_PLATFORM_C */
#endif /* MBEDTLS_SELF_TEST */

#if !defined(MBEDTLS_SHA1_ALT)

/*
 * 32-bit integer manipulation macros (big endian)
 */
#ifndef GET_UINT32_BE
#define GET_UINT32_BE(n,b,i)                            \
    {                                                       \
        (n) = ( (uint32_t) (b)[(i)    ] << 24 )             \
              | ( (uint32_t) (b)[(i) + 1] << 16 )             \
              | ( (uint32_t) (b)[(i) + 2] <<  8 )             \
              | ( (uint32_t) (b)[(i) + 3]       );            \
    }
#endif

#ifndef PUT_UINT32_BE
#define PUT_UINT32_BE(n,b,i)                            \
    {                                                       \
        (b)[(i)    ] = (unsigned char) ( (n) >> 24 );       \
        (b)[(i) + 1] = (unsigned char) ( (n) >> 16 );       \
        (b)[(i) + 2] = (unsigned char) ( (n) >>  8 );       \
        (b)[(i) + 3] = (unsigned char) ( (n)       );       \
    }
#endif

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_ret(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_DEPRECATED_REMOVED)
void mbedtls_sha1_starts(mbedtls_sha1_context *ctx) {
    mbedtls_sha1_starts_ret(ctx);
}
#endif

#if !defined(MBEDTLS_SHA1_PROCESS_ALT)
int mbedtls_internal_sha1_process(mbedtls_sha1_context *ctx,
                                  const unsigned char data[64]) {
    uint32_t temp, W[16], A, B, C, D, E;

    GET_UINT32_BE(W[ 0], data,  0);
    GET_UINT32_BE(W[ 1], data,  4);
    GET_UINT32_BE(W[ 2], data,  8);
    GET_UINT32_BE(W[ 3], data, 12);
    GET_UINT32_BE(W[ 4], data, 16);
    GET_UINT32_BE(W[ 5], data, 20);
    GET_UINT32_BE(W[ 6], data, 24);
    GET_UINT32_BE(W[ 7], data, 28);
    GET_UINT32_BE(W[ 8], data, 32);
    GET_UINT32_BE(W[ 9], data, 36);
    GET_UINT32_BE(W[10], data, 40);
    GET_UINT32_BE(W[11], data, 44);
    GET_UINT32_BE(W[12], data, 48);
    GET_UINT32_BE(W[13], data, 52);
    GET_UINT32_BE(W[14], data, 56);
    GET_UINT32_BE(W[15], data, 60);

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

#define R(t)                                            \
    (                                                       \
                                                            temp = W[( t -  3 ) & 0x0F] ^ W[( t - 8 ) & 0x0F] ^ \
                                                                    W[( t - 14 ) & 0x0F] ^ W[  t       & 0x0F],  \
                                                            ( W[t & 0x0F] = S(temp,1) )                         \
    )

#define P(a,b,c,d,e,x)                                  \
    {                                                       \
        e += S(a,5) + F(b,c,d) + K + x; b = S(b,30);        \
    }

    A = ctx->state[0];
    B = ctx->state[1];
    C = ctx->state[2];
    D = ctx->state[3];
    E = ctx->state[4];

#define F(x,y,z) (z ^ (x & (y ^ z)))
#define K 0x5A827999

    P(A, B, C, D, E, W[0]);
    P(E, A, B, C, D, W[1]);
    P(D, E, A, B, C, W[2]);
    P(C, D, E, A, B, W[3]);
    P(B, C, D, E, A, W[4]);
    P(A, B, C, D, E, W[5]);
    P(E, A, B, C, D, W[6]);
    P(D, E, A, B, C, W[7]);
    P(C, D, E, A, B, W[8]);
    P(B, C, D, E, A, W[9]);
    P(A, B, C, D, E, W[10]);
    P(E, A, B, C, D, W[11]);
    P(D, E, A, B, C, W[12]);
    P(C, D, E, A, B, W[13]);
    P(B, C, D, E, A, W[14]);
    P(A, B, C, D, E, W[15]);
    P(E, A, B, C, D, R(16));
    P(D, E, A, B, C, R(17));
    P(C, D, E, A, B, R(18));
    P(B, C, D, E, A, R(19));

#undef K
#undef F

#define F(x,y,z) (x ^ y ^ z)
#define K 0x6ED9EBA1

    P(A, B, C, D, E, R(20));
    P(E, A, B, C, D, R(21));
    P(D, E, A, B, C, R(22));
    P(C, D, E, A, B, R(23));
    P(B, C, D, E, A, R(24));
    P(A, B, C, D, E, R(25));
    P(E, A, B, C, D, R(26));
    P(D, E, A, B, C, R(27));
    P(C, D, E, A, B, R(28));
    P(B, C, D, E, A, R(29));
    P(A, B, C, D, E, R(30));
    P(E, A, B, C, D, R(31));
    P(D, E, A, B, C, R(32));
    P(C, D, E, A, B, R(33));
    P(B, C, D, E, A, R(34));
    P(A, B, C, D, E, R(35));
    P(E, A, B, C, D, R(36));
    P(D, E, A, B, C, R(37));
    P(C, D, E, A, B, R(38));
    P(B, C, D, E, A, R(39));

#undef K
#undef F

#define F(x,y,z) ((x & y) | (z & (x | y)))
#define K 0x8F1BBCDC

    P(A, B, C, D, E, R(40));
    P(E, A, B, C, D, R(41));
    P(D, E, A, B, C, R(42));
    P(C, D, E, A, B, R(43));
    P(B, C, D, E, A, R(44));
    P(A, B, C, D, E, R(45));
    P(E, A, B, C, D, R(46));
    P(D, E, A, B, C, R(47));
    P(C, D, E, A, B, R(48));
    P(B, C, D, E, A, R(49));
    P(A, B, C, D, E, R(50));
    P(E, A, B, C, D, R(51));
    P(D, E, A, B, C, R(52));
    P(C, D, E, A, B, R(53));
    P(B, C, D, E, A, R(54));
    P(A, B, C, D, E, R(55));
    P(E, A, B, C, D, R(56));
    P(D, E, A, B, C, R(57));
    P(C, D, E, A, B, R(58));
    P(B, C, D, E, A, R(59));

#undef K
#undef F

#define F(x,y,z) (x ^ y ^ z)
#define K 0xCA62C1D6

    P(A, B, C, D, E, R(60));
    P(E, A, B, C, D, R(61));
    P(D, E, A, B, C, R(62));
    P(C, D, E, A, B, R(63));
    P(B, C, D, E, A, R(64));
    P(A, B, C, D, E, R(65));
    P(E, A, B, C, D, R(66));
    P(D, E, A, B, C, R(67));
    P(C, D, E, A, B, R(68));
    P(B, C, D, E, A, R(69));
    P(A, B, C, D, E, R(70));
    P(E, A, B, C, D, R(71));
    P(D, E, A, B, C, R(72));
    P(C, D, E, A, B, R(73));
    P(B, C, D, E, A, R(74));
    P(A, B, C, D, E, R(75));
    P(E, A, B, C, D, R(76));
    P(D, E, A, B, C, R(77));
    P(C, D, E, A, B, R(78));
    P(B, C, D, E, A, R(79));

#undef K
#undef F

    ctx->state[0] += A;
    ctx->state[1] += B;
    ctx->state[2] += C;
    ctx->state[3] += D;
    ctx->state[4] += E;

    return (0);
}

#if !defined(MBEDTLS_DEPRECATED_REMOVED)
void mbedtls_sha1_process(mbedtls_sha1_context *ctx,
                          const unsigned char data[64]) {
    mbedtls_internal_sha1_process(ctx, data);
}
#endif
#endif /* !MBEDTLS_SHA1_PROCESS_ALT */

/*
 * SHA-1 process buffer
 */
int mbedtls_sha1_update_ret(mbedtls_sha1_context *ctx,
                            const unsigned char *input,
                            size_t ilen) {
    int ret;
    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);
}

#if !defined(MBEDTLS_DEPRECATED_REMOVED)
void mbedtls_sha1_update(mbedtls_sha1_context *ctx,
                         const unsigned char *input,
                         size_t ilen) {
    mbedtls_sha1_update_ret(ctx, input, ilen);
}
#endif

/*
 * SHA-1 final digest
 */
int mbedtls_sha1_finish_ret(mbedtls_sha1_context *ctx,
                            unsigned char output[20]) {
    int ret;
    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);

    PUT_UINT32_BE(high, ctx->buffer, 56);
    PUT_UINT32_BE(low,  ctx->buffer, 60);

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

    /*
     * Output final state
     */
    PUT_UINT32_BE(ctx->state[0], output,  0);
    PUT_UINT32_BE(ctx->state[1], output,  4);
    PUT_UINT32_BE(ctx->state[2], output,  8);
    PUT_UINT32_BE(ctx->state[3], output, 12);
    PUT_UINT32_BE(ctx->state[4], output, 16);

    return (0);
}

#if !defined(MBEDTLS_DEPRECATED_REMOVED)
void mbedtls_sha1_finish(mbedtls_sha1_context *ctx,
                         unsigned char output[20]) {
    mbedtls_sha1_finish_ret(ctx, output);
}
#endif

#endif /* !MBEDTLS_SHA1_ALT */

/*
 * output = SHA-1( input buffer )
 */
int mbedtls_sha1_ret(const unsigned char *input,
                     size_t ilen,
                     unsigned char output[20]) {
    int ret;
    mbedtls_sha1_context ctx;

    mbedtls_sha1_init(&ctx);

    if ((ret = mbedtls_sha1_starts_ret(&ctx)) != 0)
        goto exit;

    if ((ret = mbedtls_sha1_update_ret(&ctx, input, ilen)) != 0)
        goto exit;

    if ((ret = mbedtls_sha1_finish_ret(&ctx, output)) != 0)
        goto exit;

exit:
    mbedtls_sha1_free(&ctx);

    return (ret);
}

#if !defined(MBEDTLS_DEPRECATED_REMOVED)
void mbedtls_sha1(const unsigned char *input,
                  size_t ilen,
                  unsigned char output[20]) {
    mbedtls_sha1_ret(input, ilen, output);
}
#endif

#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_ret(&ctx)) != 0)
            goto fail;

        if (i == 2) {
            memset(buf, 'a', buflen = 1000);

            for (j = 0; j < 1000; j++) {
                ret = mbedtls_sha1_update_ret(&ctx, buf, buflen);
                if (ret != 0)
                    goto fail;
            }
        } else {
            ret = mbedtls_sha1_update_ret(&ctx, sha1_test_buf[i],
                                          sha1_test_buflen[i]);
            if (ret != 0)
                goto fail;
        }

        if ((ret = mbedtls_sha1_finish_ret(&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 */