library/sha1.c - security/mbedtls - Rivoreo Source Code Repositories

 /*
  *  FIPS-180-1 compliant SHA-1 implementation
  *
  *  Copyright (C) 2006-2014, ARM Limited, All Rights Reserved
  *
  *  This file is part of mbed TLS (https://tls.mbed.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
  */

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

 #if defined(POLARSSL_SHA1_C)

 #include "mbedtls/sha1.h"

 #include <string.h>

 #if defined(POLARSSL_FS_IO)
 #include <stdio.h>
 #endif

 #if defined(POLARSSL_SELF_TEST)
 #if defined(POLARSSL_PLATFORM_C)
 #include "mbedtls/platform.h"
 #else
 #include <stdio.h>
 #define polarssl_printf printf
 #endif /* POLARSSL_PLATFORM_C */
 #endif /* POLARSSL_SELF_TEST */

 /* 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;
 }

 #if !defined(POLARSSL_SHA1_PROCESS_ALT)
 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;
 }
 #endif /* !POLARSSL_SHA1_PROCESS_ALT */

 /*
  * 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 */

 #if defined(POLARSSL_SELF_TEST)
 /*
  * FIPS-180-1 test vectors
  */
 static const 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 }
 };

 /*
  * 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" );

 exit:
     sha1_free( &ctx );

     return( ret );
 }

 #endif /* POLARSSL_SELF_TEST */

 #endif /* POLARSSL_SHA1_C */
	/*
	* FIPS-180-1 compliant SHA-1 implementation
	*
	* Copyright (C) 2006-2014, ARM Limited, All Rights Reserved
	*
	* This file is part of mbed TLS (https://tls.mbed.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
	*/

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

	#if defined(POLARSSL_SHA1_C)

	#include "mbedtls/sha1.h"

	#include <string.h>

	#if defined(POLARSSL_FS_IO)
	#include <stdio.h>
	#endif

	#if defined(POLARSSL_SELF_TEST)
	#if defined(POLARSSL_PLATFORM_C)
	#include "mbedtls/platform.h"
	#else
	#include <stdio.h>
	#define polarssl_printf printf
	#endif /* POLARSSL_PLATFORM_C */
	#endif /* POLARSSL_SELF_TEST */

	/* 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;
	}

	#if !defined(POLARSSL_SHA1_PROCESS_ALT)
	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;
	}
	#endif /* !POLARSSL_SHA1_PROCESS_ALT */

	/*
	* 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 */

	#if defined(POLARSSL_SELF_TEST)
	/*
	* FIPS-180-1 test vectors
	*/
	static const 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 }
	};

	/*
	* 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" );

	exit:
	sha1_free( &ctx );

	return( ret );
	}

	#endif /* POLARSSL_SELF_TEST */

	#endif /* POLARSSL_SHA1_C */