sha1.c

一个sha 哈希密码支撑算法系列的程序 包括了sha1

    sha1_update( &ctx, input, ilen );
    sha1_finish( &ctx, output );

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

/*
 * output = SHA-1( file contents )
 */
int sha1_file( 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( 1 );

    sha1_starts( &ctx );

    while( ( n = fread( buf, 1, sizeof( buf ), f ) ) > 0 )
        sha1_update( &ctx, buf, (int) n );

    sha1_finish( &ctx, output );

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

    if( ferror( f ) != 0 )
    {
        fclose( f );
        return( 2 );
    }

    fclose( f );
    return( 0 );
}

/*
 * SHA-1 HMAC context setup
 */
void sha1_hmac_starts( sha1_context *ctx, unsigned char *key, int keylen )
{
    int 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 );

    memset( sum, 0, sizeof( sum ) );
}

/*
 * SHA-1 HMAC process buffer
 */
void sha1_hmac_update( sha1_context *ctx, unsigned char *input, int 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 );

    memset( tmpbuf, 0, sizeof( tmpbuf ) );
}

/*
 * output = HMAC-SHA-1( hmac key, input buffer )
 */
void sha1_hmac( unsigned char *key, int keylen,
                unsigned char *input, int ilen,
                unsigned char output[20] )
{
    sha1_context ctx;

    sha1_hmac_starts( &ctx, key, keylen );
    sha1_hmac_update( &ctx, input, ilen );
    sha1_hmac_finish( &ctx, output );

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

#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;
    unsigned char buf[1024];
    unsigned char sha1sum[20];
    sha1_context ctx;

    /*
     * SHA-1
     */
    for( i = 0; i < 3; i++ )
    {
        if( verbose != 0 )
            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 )
                printf( "failed\n" );

            return( 1 );
        }

        if( verbose != 0 )
            printf( "passed\n" );
    }

    if( verbose != 0 )
        printf( "\n" );

    for( i = 0; i < 7; i++ )
    {
        if( verbose != 0 )
            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 )
                printf( "failed\n" );

            return( 1 );
        }

        if( verbose != 0 )
            printf( "passed\n" );
    }

    if( verbose != 0 )
        printf( "\n" );

    return( 0 );
}

#endif

#endif