lib/sha1.c - github/trini/u-boot - Gitiles

 /*
  *  Heiko Schocher, DENX Software Engineering, hs@denx.de.
  *  based on:
  *  FIPS-180-1 compliant SHA-1 implementation
  *
  *  Copyright (C) 2003-2006  Christophe Devine
  *
  *  This library is free software; you can redistribute it and/or
  *  modify it under the terms of the GNU Lesser General Public
  *  License, version 2.1 as published by the Free Software Foundation.
  *
  *  This library 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
  *  Lesser General Public License for more details.
  *
  *  You should have received a copy of the GNU Lesser General Public
  *  License along with this library; 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
  */

 #ifndef _CRT_SECURE_NO_DEPRECATE
 #define _CRT_SECURE_NO_DEPRECATE 1
 #endif

 #ifndef USE_HOSTCC
 #include <common.h>
 #include <linux/string.h>
 #else
 #include <string.h>
 #endif /* USE_HOSTCC */
 #include <watchdog.h>
 #include "sha1.h"

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

 /*
  * 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;
 }

 static void sha1_process(sha1_context *ctx, const unsigned char data[64])
 {
 	unsigned long 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,
 		 unsigned int ilen)
 {
 	int fill;
 	unsigned long left;

 	if (ilen <= 0)
 		return;

 	left = ctx->total[0] & 0x3F;
 	fill = 64 - left;

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

 	if (ctx->total[0] < (unsigned long) ilen)
 		ctx->total[1]++;

 	if (left && ilen >= fill) {
 		memcpy ((void *) (ctx->buffer + left), (void *) 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), (void *) 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])
 {
 	unsigned long last, padn;
 	unsigned long 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, (unsigned char *) 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);
 }

 /*
  * Output = SHA-1( input buffer )
  */
 void sha1_csum(const unsigned char *input, unsigned int ilen,
 	       unsigned char *output)
 {
 	sha1_context ctx;

 	sha1_starts (&ctx);
 	sha1_update (&ctx, input, ilen);
 	sha1_finish (&ctx, output);
 }

 /*
  * Output = SHA-1( input buffer ). Trigger the watchdog every 'chunk_sz'
  * bytes of input processed.
  */
 void sha1_csum_wd(const unsigned char *input, unsigned int ilen,
 		  unsigned char *output, unsigned int chunk_sz)
 {
 	sha1_context ctx;
 #if defined(CONFIG_HW_WATCHDOG) || defined(CONFIG_WATCHDOG)
 	const unsigned char *end, *curr;
 	int chunk;
 #endif

 	sha1_starts (&ctx);

 #if defined(CONFIG_HW_WATCHDOG) || defined(CONFIG_WATCHDOG)
 	curr = input;
 	end = input + ilen;
 	while (curr < end) {
 		chunk = end - curr;
 		if (chunk > chunk_sz)
 			chunk = chunk_sz;
 		sha1_update (&ctx, curr, chunk);
 		curr += chunk;
 		WATCHDOG_RESET ();
 	}
 #else
 	sha1_update (&ctx, input, ilen);
 #endif

 	sha1_finish (&ctx, output);
 }

 /*
  * Output = HMAC-SHA-1( input buffer, hmac key )
  */
 void sha1_hmac(const unsigned char *key, int keylen,
 	       const unsigned char *input, unsigned int ilen,
 	       unsigned char *output)
 {
 	int i;
 	sha1_context ctx;
 	unsigned char k_ipad[64];
 	unsigned char k_opad[64];
 	unsigned char tmpbuf[20];

 	memset (k_ipad, 0x36, 64);
 	memset (k_opad, 0x5C, 64);

 	for (i = 0; i < keylen; i++) {
 		if (i >= 64)
 			break;

 		k_ipad[i] ^= key[i];
 		k_opad[i] ^= key[i];
 	}

 	sha1_starts (&ctx);
 	sha1_update (&ctx, k_ipad, 64);
 	sha1_update (&ctx, input, ilen);
 	sha1_finish (&ctx, tmpbuf);

 	sha1_starts (&ctx);
 	sha1_update (&ctx, k_opad, 64);
 	sha1_update (&ctx, tmpbuf, 20);
 	sha1_finish (&ctx, output);

 	memset (k_ipad, 0, 64);
 	memset (k_opad, 0, 64);
 	memset (tmpbuf, 0, 20);
 	memset (&ctx, 0, sizeof (sha1_context));
 }

 static const char _sha1_src[] = "_sha1_src";

 #ifdef SELF_TEST
 /*
  * FIPS-180-1 test vectors
  */
 static const char sha1_test_str[3][57] = {
 	{"abc"},
 	{"abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq"},
 	{""}
 };

 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 (void)
 {
 	int i, j;
 	unsigned char buf[1000];
 	unsigned char sha1sum[20];
 	sha1_context ctx;

 	for (i = 0; i < 3; i++) {
 		printf ("  SHA-1 test #%d: ", i + 1);

 		sha1_starts (&ctx);

 		if (i < 2)
 			sha1_update (&ctx, (unsigned char *) sha1_test_str[i],
 				     strlen (sha1_test_str[i]));
 		else {
 			memset (buf, 'a', 1000);
 			for (j = 0; j < 1000; j++)
 				sha1_update (&ctx, buf, 1000);
 		}

 		sha1_finish (&ctx, sha1sum);

 		if (memcmp (sha1sum, sha1_test_sum[i], 20) != 0) {
 			printf ("failed\n");
 			return (1);
 		}

 		printf ("passed\n");
 	}

 	printf ("\n");
 	return (0);
 }
 #else
 int sha1_self_test (void)
 {
 	return (0);
 }
 #endif
	/*
	* Heiko Schocher, DENX Software Engineering, hs@denx.de.
	* based on:
	* FIPS-180-1 compliant SHA-1 implementation
	*
	* Copyright (C) 2003-2006 Christophe Devine
	*
	* This library is free software; you can redistribute it and/or
	* modify it under the terms of the GNU Lesser General Public
	* License, version 2.1 as published by the Free Software Foundation.
	*
	* This library 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
	* Lesser General Public License for more details.
	*
	* You should have received a copy of the GNU Lesser General Public
	* License along with this library; 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
	*/

	#ifndef _CRT_SECURE_NO_DEPRECATE
	#define _CRT_SECURE_NO_DEPRECATE 1
	#endif

	#ifndef USE_HOSTCC
	#include <common.h>
	#include <linux/string.h>
	#else
	#include <string.h>
	#endif /* USE_HOSTCC */
	#include <watchdog.h>
	#include "sha1.h"

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

	/*
	* 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;
	}

	static void sha1_process(sha1_context *ctx, const unsigned char data[64])
	{
	unsigned long 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,
	unsigned int ilen)
	{
	int fill;
	unsigned long left;

	if (ilen <= 0)
	return;

	left = ctx->total[0] & 0x3F;
	fill = 64 - left;

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

	if (ctx->total[0] < (unsigned long) ilen)
	ctx->total[1]++;

	if (left && ilen >= fill) {
	memcpy ((void ) (ctx->buffer + left), (void ) 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), (void ) 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])
	{
	unsigned long last, padn;
	unsigned long 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, (unsigned char *) 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);
	}

	/*
	* Output = SHA-1( input buffer )
	*/
	void sha1_csum(const unsigned char *input, unsigned int ilen,
	unsigned char *output)
	{
	sha1_context ctx;

	sha1_starts (&ctx);
	sha1_update (&ctx, input, ilen);
	sha1_finish (&ctx, output);
	}

	/*
	* Output = SHA-1( input buffer ). Trigger the watchdog every 'chunk_sz'
	* bytes of input processed.
	*/
	void sha1_csum_wd(const unsigned char *input, unsigned int ilen,
	unsigned char *output, unsigned int chunk_sz)
	{
	sha1_context ctx;
	#if defined(CONFIG_HW_WATCHDOG) \|\| defined(CONFIG_WATCHDOG)
	const unsigned char end, curr;
	int chunk;
	#endif

	sha1_starts (&ctx);

	#if defined(CONFIG_HW_WATCHDOG) \|\| defined(CONFIG_WATCHDOG)
	curr = input;
	end = input + ilen;
	while (curr < end) {
	chunk = end - curr;
	if (chunk > chunk_sz)
	chunk = chunk_sz;
	sha1_update (&ctx, curr, chunk);
	curr += chunk;
	WATCHDOG_RESET ();
	}
	#else
	sha1_update (&ctx, input, ilen);
	#endif

	sha1_finish (&ctx, output);
	}

	/*
	* Output = HMAC-SHA-1( input buffer, hmac key )
	*/
	void sha1_hmac(const unsigned char *key, int keylen,
	const unsigned char *input, unsigned int ilen,
	unsigned char *output)
	{
	int i;
	sha1_context ctx;
	unsigned char k_ipad[64];
	unsigned char k_opad[64];
	unsigned char tmpbuf[20];

	memset (k_ipad, 0x36, 64);
	memset (k_opad, 0x5C, 64);

	for (i = 0; i < keylen; i++) {
	if (i >= 64)
	break;

	k_ipad[i] ^= key[i];
	k_opad[i] ^= key[i];
	}

	sha1_starts (&ctx);
	sha1_update (&ctx, k_ipad, 64);
	sha1_update (&ctx, input, ilen);
	sha1_finish (&ctx, tmpbuf);

	sha1_starts (&ctx);
	sha1_update (&ctx, k_opad, 64);
	sha1_update (&ctx, tmpbuf, 20);
	sha1_finish (&ctx, output);

	memset (k_ipad, 0, 64);
	memset (k_opad, 0, 64);
	memset (tmpbuf, 0, 20);
	memset (&ctx, 0, sizeof (sha1_context));
	}

	static const char _sha1_src[] = "_sha1_src";

	#ifdef SELF_TEST
	/*
	* FIPS-180-1 test vectors
	*/
	static const char sha1_test_str[3][57] = {
	{"abc"},
	{"abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq"},
	{""}
	};

	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 (void)
	{
	int i, j;
	unsigned char buf[1000];
	unsigned char sha1sum[20];
	sha1_context ctx;

	for (i = 0; i < 3; i++) {
	printf (" SHA-1 test #%d: ", i + 1);

	sha1_starts (&ctx);

	if (i < 2)
	sha1_update (&ctx, (unsigned char *) sha1_test_str[i],
	strlen (sha1_test_str[i]));
	else {
	memset (buf, 'a', 1000);
	for (j = 0; j < 1000; j++)
	sha1_update (&ctx, buf, 1000);
	}

	sha1_finish (&ctx, sha1sum);

	if (memcmp (sha1sum, sha1_test_sum[i], 20) != 0) {
	printf ("failed\n");
	return (1);
	}

	printf ("passed\n");
	}

	printf ("\n");
	return (0);
	}
	#else
	int sha1_self_test (void)
	{
	return (0);
	}
	#endif