/*

 *  FIPS-180-1 compliant SHA-1 implementation

 *

 *  Copyright (C) 2006-2014, ARM Limited, All Rights Reserved

 *

 *  This file is part of mbed TLS (https://polarssl.org)

 *

 *  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.

 */

/*

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

 *

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

 */

#include "sha1.h"

#define polarssl_printf printf

/* Implementation that should never be optimized out by the compiler */

static void polarssl_zeroize( void *v, size_t n ) {

    volatile unsigned char *p = v; while( n-- ) *p++ = 0;

}

#if !defined(POLARSSL_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 sha1_init( sha1_context *ctx )

{

    memset( ctx, 0, sizeof( sha1_context ) );

}

void sha1_free( sha1_context *ctx )

{

    if( ctx == NULL )

        return;

    polarssl_zeroize( ctx, sizeof( sha1_context ) );

}

/*

 * SHA-1 context setup

 */

void sha1_starts( 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;

}

void sha1_process( 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;

}

/*

 * SHA-1 process buffer

 */

void sha1_update( sha1_context *ctx, const unsigned char *input, size_t ilen )

{

    size_t fill;

    uint32_t left;

    if( ilen == 0 )

        return;

    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 );

        sha1_process( ctx, ctx->buffer );

        input += fill;

        ilen  -= fill;

        left = 0;

    }

    while( ilen >= 64 )

    {

        sha1_process( ctx, input );

        input += 64;

        ilen  -= 64;

    }

    if( ilen > 0 )

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

}

static const unsigned char sha1_padding[64] =

{

 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0

};

/*

 * SHA-1 final digest

 */

void sha1_finish( sha1_context *ctx, unsigned char output[20] )

{

    uint32_t last, padn;

    uint32_t high, low;

    unsigned char msglen[8];

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

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

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

    PUT_UINT32_BE( high, msglen, 0 );

    PUT_UINT32_BE( low,  msglen, 4 );

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

    padn = ( last < 56 ) ? ( 56 - last ) : ( 120 - last );

    sha1_update( ctx, sha1_padding, padn );

    sha1_update( ctx, msglen, 8 );

    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 );

}

#endif /* !POLARSSL_SHA1_ALT */

/*

 * output = SHA-1( input buffer )

 */

void sha1( const unsigned char *input, size_t ilen, unsigned char output[20] )

{

    sha1_context ctx;

    sha1_init( &ctx );

    sha1_starts( &ctx );

    sha1_update( &ctx, input, ilen );

    sha1_finish( &ctx, output );

    sha1_free( &ctx );

}

#if defined(POLARSSL_FS_IO)

/*

 * output = SHA-1( file contents )

 */

int sha1_file( const char *path, unsigned char output[20] )

{

    FILE *f;

    size_t n;

    sha1_context ctx;

    unsigned char buf[1024];

    if( ( f = fopen( path, "rb" ) ) == NULL )

        return( POLARSSL_ERR_SHA1_FILE_IO_ERROR );

    sha1_init( &ctx );

    sha1_starts( &ctx );

    while( ( n = fread( buf, 1, sizeof( buf ), f ) ) > 0 )

        sha1_update( &ctx, buf, n );

    sha1_finish( &ctx, output );

    sha1_free( &ctx );

    if( ferror( f ) != 0 )

    {

        fclose( f );

        return( POLARSSL_ERR_SHA1_FILE_IO_ERROR );

    }

    fclose( f );

    return( 0 );

}

#endif /* POLARSSL_FS_IO */

/*

 * SHA-1 HMAC context setup

 */

void sha1_hmac_starts( sha1_context *ctx, const unsigned char *key,

                       size_t keylen )

{

    size_t i;

    unsigned char sum[20];

    if( keylen > 64 )

    {

        sha1( key, keylen, sum );

        keylen = 20;

        key = sum;

    }

    memset( ctx->ipad, 0x36, 64 );

    memset( ctx->opad, 0x5C, 64 );

    for( i = 0; i < keylen; i++ )

    {

        ctx->ipad[i] = (unsigned char)( ctx->ipad[i] ^ key[i] );

        ctx->opad[i] = (unsigned char)( ctx->opad[i] ^ key[i] );

    }

    sha1_starts( ctx );

    sha1_update( ctx, ctx->ipad, 64 );

    polarssl_zeroize( sum, sizeof( sum ) );

}

/*

 * SHA-1 HMAC process buffer

 */

void sha1_hmac_update( sha1_context *ctx, const unsigned char *input,

                       size_t ilen )

{

    sha1_update( ctx, input, ilen );

}

/*

 * SHA-1 HMAC final digest

 */

void sha1_hmac_finish( sha1_context *ctx, unsigned char output[20] )

{

    unsigned char tmpbuf[20];

    sha1_finish( ctx, tmpbuf );

    sha1_starts( ctx );

    sha1_update( ctx, ctx->opad, 64 );

    sha1_update( ctx, tmpbuf, 20 );

    sha1_finish( ctx, output );

    polarssl_zeroize( tmpbuf, sizeof( tmpbuf ) );

}

/*

 * SHA1 HMAC context reset

 */

void sha1_hmac_reset( sha1_context *ctx )

{

    sha1_starts( ctx );

    sha1_update( ctx, ctx->ipad, 64 );

}

/*

 * output = HMAC-SHA-1( hmac key, input buffer )

 */

void sha1_hmac( const unsigned char *key, size_t keylen,

                const unsigned char *input, size_t ilen,

                unsigned char output[20] )

{

    sha1_context ctx;

    sha1_init( &ctx );

    sha1_hmac_starts( &ctx, key, keylen );

    sha1_hmac_update( &ctx, input, ilen );

    sha1_hmac_finish( &ctx, output );

    sha1_free( &ctx );

}

#if defined(POLARSSL_SELF_TEST)

/*

 * FIPS-180-1 test vectors

 */

static unsigned char sha1_test_buf[3][57] =

{

    { "abc" },

    { "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq" },

    { "" }

};

static const int 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 }

};

/*

 * RFC 2202 test vectors

 */

static unsigned char sha1_hmac_test_key[7][26] =

{

    { "\x0B\x0B\x0B\x0B\x0B\x0B\x0B\x0B\x0B\x0B\x0B\x0B\x0B\x0B\x0B\x0B"

      "\x0B\x0B\x0B\x0B" },

    { "Jefe" },

    { "\xAA\xAA\xAA\xAA\xAA\xAA\xAA\xAA\xAA\xAA\xAA\xAA\xAA\xAA\xAA\xAA"

      "\xAA\xAA\xAA\xAA" },

    { "\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0A\x0B\x0C\x0D\x0E\x0F\x10"

      "\x11\x12\x13\x14\x15\x16\x17\x18\x19" },

    { "\x0C\x0C\x0C\x0C\x0C\x0C\x0C\x0C\x0C\x0C\x0C\x0C\x0C\x0C\x0C\x0C"

      "\x0C\x0C\x0C\x0C" },

    { "" }, /* 0xAA 80 times */

    { "" }

};

static const int sha1_hmac_test_keylen[7] =

{

    20, 4, 20, 25, 20, 80, 80

};

static unsigned char sha1_hmac_test_buf[7][74] =

{

    { "Hi There" },

    { "what do ya want for nothing?" },

    { "\xDD\xDD\xDD\xDD\xDD\xDD\xDD\xDD\xDD\xDD"

      "\xDD\xDD\xDD\xDD\xDD\xDD\xDD\xDD\xDD\xDD"

      "\xDD\xDD\xDD\xDD\xDD\xDD\xDD\xDD\xDD\xDD"

      "\xDD\xDD\xDD\xDD\xDD\xDD\xDD\xDD\xDD\xDD"

      "\xDD\xDD\xDD\xDD\xDD\xDD\xDD\xDD\xDD\xDD" },

    { "\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD"

      "\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD"

      "\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD"

      "\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD"

      "\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD" },

    { "Test With Truncation" },

    { "Test Using Larger Than Block-Size Key - Hash Key First" },

    { "Test Using Larger Than Block-Size Key and Larger"

      " Than One Block-Size Data" }

};

static const int sha1_hmac_test_buflen[7] =

{

    8, 28, 50, 50, 20, 54, 73

};

static const unsigned char sha1_hmac_test_sum[7][20] =

{

    { 0xB6, 0x17, 0x31, 0x86, 0x55, 0x05, 0x72, 0x64, 0xE2, 0x8B,

      0xC0, 0xB6, 0xFB, 0x37, 0x8C, 0x8E, 0xF1, 0x46, 0xBE, 0x00 },

    { 0xEF, 0xFC, 0xDF, 0x6A, 0xE5, 0xEB, 0x2F, 0xA2, 0xD2, 0x74,

      0x16, 0xD5, 0xF1, 0x84, 0xDF, 0x9C, 0x25, 0x9A, 0x7C, 0x79 },

    { 0x12, 0x5D, 0x73, 0x42, 0xB9, 0xAC, 0x11, 0xCD, 0x91, 0xA3,

      0x9A, 0xF4, 0x8A, 0xA1, 0x7B, 0x4F, 0x63, 0xF1, 0x75, 0xD3 },

    { 0x4C, 0x90, 0x07, 0xF4, 0x02, 0x62, 0x50, 0xC6, 0xBC, 0x84,

      0x14, 0xF9, 0xBF, 0x50, 0xC8, 0x6C, 0x2D, 0x72, 0x35, 0xDA },

    { 0x4C, 0x1A, 0x03, 0x42, 0x4B, 0x55, 0xE0, 0x7F, 0xE7, 0xF2,

      0x7B, 0xE1 },

    { 0xAA, 0x4A, 0xE5, 0xE1, 0x52, 0x72, 0xD0, 0x0E, 0x95, 0x70,

      0x56, 0x37, 0xCE, 0x8A, 0x3B, 0x55, 0xED, 0x40, 0x21, 0x12 },

    { 0xE8, 0xE9, 0x9D, 0x0F, 0x45, 0x23, 0x7D, 0x78, 0x6D, 0x6B,

      0xBA, 0xA7, 0x96, 0x5C, 0x78, 0x08, 0xBB, 0xFF, 0x1A, 0x91 }

};

/*

 * Checkup routine

 */

int sha1_self_test( int verbose )

{

    int i, j, buflen, ret = 0;

    unsigned char buf[1024];

    unsigned char sha1sum[20];

    sha1_context ctx;

    sha1_init( &ctx );

    /*

     * SHA-1

     */

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

    {

        if( verbose != 0 )

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

        sha1_starts( &ctx );

        if( i == 2 )

        {

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

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

                sha1_update( &ctx, buf, buflen );

        }

        else

            sha1_update( &ctx, sha1_test_buf[i],

                               sha1_test_buflen[i] );

        sha1_finish( &ctx, sha1sum );

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

        {

            if( verbose != 0 )

                polarssl_printf( "failed\n" );

            ret = 1;

            goto exit;

        }

        if( verbose != 0 )

            polarssl_printf( "passed\n" );

    }

    if( verbose != 0 )

        polarssl_printf( "\n" );

    for( i = 0; i < 7; i++ )

    {

        if( verbose != 0 )

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

        if( i == 5 || i == 6 )

        {

            memset( buf, '\xAA', buflen = 80 );

            sha1_hmac_starts( &ctx, buf, buflen );

        }

        else

            sha1_hmac_starts( &ctx, sha1_hmac_test_key[i],

                                    sha1_hmac_test_keylen[i] );

        sha1_hmac_update( &ctx, sha1_hmac_test_buf[i],

                                sha1_hmac_test_buflen[i] );

        sha1_hmac_finish( &ctx, sha1sum );

        buflen = ( i == 4 ) ? 12 : 20;

        if( memcmp( sha1sum, sha1_hmac_test_sum[i], buflen ) != 0 )

        {

            if( verbose != 0 )

                polarssl_printf( "failed\n" );

            ret = 1;

            goto exit;

        }

        if( verbose != 0 )

            polarssl_printf( "passed\n" );

    }

    if( verbose != 0 )

        polarssl_printf( "\n" );

exit:

    sha1_free( &ctx );

    return( ret );

}

#endif /* POLARSSL_SELF_TEST */