lib/sha-1.c - platform/external/libwebsockets - Gitiles

 /*
  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  * 3. Neither the name of the project nor the names of its contributors
  *    may be used to endorse or promote products derived from this software
  *    without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  */
 /*
  * FIPS pub 180-1: Secure Hash Algorithm (SHA-1)
  * based on: http://csrc.nist.gov/fips/fip180-1.txt
  * implemented by Jun-ichiro itojun Itoh <itojun@itojun.org>
  */

 #include "private-libwebsockets.h"

 #ifdef HAVE_SYS_TYPES_H
 #include <sys/types.h>
 #endif

 struct sha1_ctxt {
 	union {
 		unsigned char		b8[20];
 		unsigned int		b32[5];
 	} h;
 	union {
 		unsigned char		b8[8];
 		u_int64_t		b64[1];
 	} c;
 	union {
 		unsigned char		b8[64];
 		unsigned int		b32[16];
 	} m;
 	unsigned char			count;
 };

 /* sanity check */
 #if !defined(BYTE_ORDER) || !defined(LITTLE_ENDIAN) || !defined(BIG_ENDIAN)
 # define unsupported 1
 #elif BYTE_ORDER != BIG_ENDIAN
 # if BYTE_ORDER != LITTLE_ENDIAN
 #  define unsupported 1
 # endif
 #endif

 #ifndef unsupported

 /* constant table */
 static const unsigned int _K[] =
 			{ 0x5a827999, 0x6ed9eba1, 0x8f1bbcdc, 0xca62c1d6 };
 #define	K(t)	_K[(t) / 20]

 #define	F0(b, c, d)	(((b) & (c)) | ((~(b)) & (d)))
 #define	F1(b, c, d)	(((b) ^ (c)) ^ (d))
 #define	F2(b, c, d)	(((b) & (c)) | ((b) & (d)) | ((c) & (d)))
 #define	F3(b, c, d)	(((b) ^ (c)) ^ (d))

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

 #define	H(n)	(ctxt->h.b32[(n)])
 #define	COUNT	(ctxt->count)
 #define	BCOUNT	(ctxt->c.b64[0] / 8)
 #define	W(n)	(ctxt->m.b32[(n)])

 #define	PUTBYTE(x)	{ \
 	ctxt->m.b8[(COUNT % 64)] = (x);		\
 	COUNT++;				\
 	COUNT %= 64;				\
 	ctxt->c.b64[0] += 8;			\
 	if (COUNT % 64 == 0)			\
 		sha1_step(ctxt);		\
 	}

 #define	PUTPAD(x)	{ \
 	ctxt->m.b8[(COUNT % 64)] = (x);		\
 	COUNT++;				\
 	COUNT %= 64;				\
 	if (COUNT % 64 == 0)			\
 		sha1_step(ctxt);		\
 	}

 static void sha1_step __P((struct sha1_ctxt *));

 static void
 sha1_step(struct sha1_ctxt *ctxt)
 {
 	unsigned int	a, b, c, d, e, tmp;
 	size_t t, s;

 #if BYTE_ORDER == LITTLE_ENDIAN
 	struct sha1_ctxt tctxt;

 	memcpy(&tctxt.m.b8[0], &ctxt->m.b8[0], 64);
 	ctxt->m.b8[0] = tctxt.m.b8[3]; ctxt->m.b8[1] = tctxt.m.b8[2];
 	ctxt->m.b8[2] = tctxt.m.b8[1]; ctxt->m.b8[3] = tctxt.m.b8[0];
 	ctxt->m.b8[4] = tctxt.m.b8[7]; ctxt->m.b8[5] = tctxt.m.b8[6];
 	ctxt->m.b8[6] = tctxt.m.b8[5]; ctxt->m.b8[7] = tctxt.m.b8[4];
 	ctxt->m.b8[8] = tctxt.m.b8[11]; ctxt->m.b8[9] = tctxt.m.b8[10];
 	ctxt->m.b8[10] = tctxt.m.b8[9]; ctxt->m.b8[11] = tctxt.m.b8[8];
 	ctxt->m.b8[12] = tctxt.m.b8[15]; ctxt->m.b8[13] = tctxt.m.b8[14];
 	ctxt->m.b8[14] = tctxt.m.b8[13]; ctxt->m.b8[15] = tctxt.m.b8[12];
 	ctxt->m.b8[16] = tctxt.m.b8[19]; ctxt->m.b8[17] = tctxt.m.b8[18];
 	ctxt->m.b8[18] = tctxt.m.b8[17]; ctxt->m.b8[19] = tctxt.m.b8[16];
 	ctxt->m.b8[20] = tctxt.m.b8[23]; ctxt->m.b8[21] = tctxt.m.b8[22];
 	ctxt->m.b8[22] = tctxt.m.b8[21]; ctxt->m.b8[23] = tctxt.m.b8[20];
 	ctxt->m.b8[24] = tctxt.m.b8[27]; ctxt->m.b8[25] = tctxt.m.b8[26];
 	ctxt->m.b8[26] = tctxt.m.b8[25]; ctxt->m.b8[27] = tctxt.m.b8[24];
 	ctxt->m.b8[28] = tctxt.m.b8[31]; ctxt->m.b8[29] = tctxt.m.b8[30];
 	ctxt->m.b8[30] = tctxt.m.b8[29]; ctxt->m.b8[31] = tctxt.m.b8[28];
 	ctxt->m.b8[32] = tctxt.m.b8[35]; ctxt->m.b8[33] = tctxt.m.b8[34];
 	ctxt->m.b8[34] = tctxt.m.b8[33]; ctxt->m.b8[35] = tctxt.m.b8[32];
 	ctxt->m.b8[36] = tctxt.m.b8[39]; ctxt->m.b8[37] = tctxt.m.b8[38];
 	ctxt->m.b8[38] = tctxt.m.b8[37]; ctxt->m.b8[39] = tctxt.m.b8[36];
 	ctxt->m.b8[40] = tctxt.m.b8[43]; ctxt->m.b8[41] = tctxt.m.b8[42];
 	ctxt->m.b8[42] = tctxt.m.b8[41]; ctxt->m.b8[43] = tctxt.m.b8[40];
 	ctxt->m.b8[44] = tctxt.m.b8[47]; ctxt->m.b8[45] = tctxt.m.b8[46];
 	ctxt->m.b8[46] = tctxt.m.b8[45]; ctxt->m.b8[47] = tctxt.m.b8[44];
 	ctxt->m.b8[48] = tctxt.m.b8[51]; ctxt->m.b8[49] = tctxt.m.b8[50];
 	ctxt->m.b8[50] = tctxt.m.b8[49]; ctxt->m.b8[51] = tctxt.m.b8[48];
 	ctxt->m.b8[52] = tctxt.m.b8[55]; ctxt->m.b8[53] = tctxt.m.b8[54];
 	ctxt->m.b8[54] = tctxt.m.b8[53]; ctxt->m.b8[55] = tctxt.m.b8[52];
 	ctxt->m.b8[56] = tctxt.m.b8[59]; ctxt->m.b8[57] = tctxt.m.b8[58];
 	ctxt->m.b8[58] = tctxt.m.b8[57]; ctxt->m.b8[59] = tctxt.m.b8[56];
 	ctxt->m.b8[60] = tctxt.m.b8[63]; ctxt->m.b8[61] = tctxt.m.b8[62];
 	ctxt->m.b8[62] = tctxt.m.b8[61]; ctxt->m.b8[63] = tctxt.m.b8[60];
 #endif

 	a = H(0); b = H(1); c = H(2); d = H(3); e = H(4);

 	for (t = 0; t < 20; t++) {
 		s = t & 0x0f;
 		if (t >= 16)
 			W(s) = S(1, W((s+13) & 0x0f) ^ W((s+8) & 0x0f) ^
 							W((s+2) & 0x0f) ^ W(s));

 		tmp = S(5, a) + F0(b, c, d) + e + W(s) + K(t);
 		e = d; d = c; c = S(30, b); b = a; a = tmp;
 	}
 	for (t = 20; t < 40; t++) {
 		s = t & 0x0f;
 		W(s) = S(1, W((s+13) & 0x0f) ^ W((s+8) & 0x0f) ^
 							W((s+2) & 0x0f) ^ W(s));
 		tmp = S(5, a) + F1(b, c, d) + e + W(s) + K(t);
 		e = d; d = c; c = S(30, b); b = a; a = tmp;
 	}
 	for (t = 40; t < 60; t++) {
 		s = t & 0x0f;
 		W(s) = S(1, W((s+13) & 0x0f) ^ W((s+8) & 0x0f) ^
 							W((s+2) & 0x0f) ^ W(s));
 		tmp = S(5, a) + F2(b, c, d) + e + W(s) + K(t);
 		e = d; d = c; c = S(30, b); b = a; a = tmp;
 	}
 	for (t = 60; t < 80; t++) {
 		s = t & 0x0f;
 		W(s) = S(1, W((s+13) & 0x0f) ^ W((s+8) & 0x0f) ^
 							W((s+2) & 0x0f) ^ W(s));
 		tmp = S(5, a) + F3(b, c, d) + e + W(s) + K(t);
 		e = d; d = c; c = S(30, b); b = a; a = tmp;
 	}

 	H(0) = H(0) + a;
 	H(1) = H(1) + b;
 	H(2) = H(2) + c;
 	H(3) = H(3) + d;
 	H(4) = H(4) + e;

 	bzero(&ctxt->m.b8[0], 64);
 }

 /*------------------------------------------------------------*/

 static void
 sha1_init(struct sha1_ctxt *ctxt)
 {
 	bzero(ctxt, sizeof(struct sha1_ctxt));
 	H(0) = 0x67452301;
 	H(1) = 0xefcdab89;
 	H(2) = 0x98badcfe;
 	H(3) = 0x10325476;
 	H(4) = 0xc3d2e1f0;
 }

 void
 sha1_pad(struct sha1_ctxt *ctxt)
 {
 	size_t padlen;		/*pad length in bytes*/
 	size_t padstart;

 	PUTPAD(0x80);

 	padstart = COUNT % 64;
 	padlen = 64 - padstart;
 	if (padlen < 8) {
 		bzero(&ctxt->m.b8[padstart], padlen);
 		COUNT += padlen;
 		COUNT %= 64;
 		sha1_step(ctxt);
 		padstart = COUNT % 64;	/* should be 0 */
 		padlen = 64 - padstart;	/* should be 64 */
 	}
 	bzero(&ctxt->m.b8[padstart], padlen - 8);
 	COUNT += (padlen - 8);
 	COUNT %= 64;
 #if BYTE_ORDER == BIG_ENDIAN
 	PUTPAD(ctxt->c.b8[0]); PUTPAD(ctxt->c.b8[1]);
 	PUTPAD(ctxt->c.b8[2]); PUTPAD(ctxt->c.b8[3]);
 	PUTPAD(ctxt->c.b8[4]); PUTPAD(ctxt->c.b8[5]);
 	PUTPAD(ctxt->c.b8[6]); PUTPAD(ctxt->c.b8[7]);
 #else
 	PUTPAD(ctxt->c.b8[7]); PUTPAD(ctxt->c.b8[6]);
 	PUTPAD(ctxt->c.b8[5]); PUTPAD(ctxt->c.b8[4]);
 	PUTPAD(ctxt->c.b8[3]); PUTPAD(ctxt->c.b8[2]);
 	PUTPAD(ctxt->c.b8[1]); PUTPAD(ctxt->c.b8[0]);
 #endif
 }

 void
 sha1_loop(struct sha1_ctxt *ctxt, const unsigned char *input, size_t len)
 {
 	size_t gaplen;
 	size_t gapstart;
 	size_t off;
 	size_t copysiz;

 	off = 0;

 	while (off < len) {
 		gapstart = COUNT % 64;
 		gaplen = 64 - gapstart;

 		copysiz = (gaplen < len - off) ? gaplen : len - off;
 		memcpy(&ctxt->m.b8[gapstart], &input[off], copysiz);
 		COUNT += copysiz;
 		COUNT %= 64;
 		ctxt->c.b64[0] += copysiz * 8;
 		if (COUNT % 64 == 0)
 			sha1_step(ctxt);
 		off += copysiz;
 	}
 }

 void
 sha1_result(struct sha1_ctxt *ctxt, void *digest0)
 {
 	unsigned char *digest;

 	digest = (unsigned char *)digest0;
 	sha1_pad(ctxt);
 #if BYTE_ORDER == BIG_ENDIAN
 	memcpy(digest, &ctxt->h.b8[0], 20);
 #else
 	digest[0] = ctxt->h.b8[3]; digest[1] = ctxt->h.b8[2];
 	digest[2] = ctxt->h.b8[1]; digest[3] = ctxt->h.b8[0];
 	digest[4] = ctxt->h.b8[7]; digest[5] = ctxt->h.b8[6];
 	digest[6] = ctxt->h.b8[5]; digest[7] = ctxt->h.b8[4];
 	digest[8] = ctxt->h.b8[11]; digest[9] = ctxt->h.b8[10];
 	digest[10] = ctxt->h.b8[9]; digest[11] = ctxt->h.b8[8];
 	digest[12] = ctxt->h.b8[15]; digest[13] = ctxt->h.b8[14];
 	digest[14] = ctxt->h.b8[13]; digest[15] = ctxt->h.b8[12];
 	digest[16] = ctxt->h.b8[19]; digest[17] = ctxt->h.b8[18];
 	digest[18] = ctxt->h.b8[17]; digest[19] = ctxt->h.b8[16];
 #endif
 }

 /*
  * This should look and work like the libcrypto implementation
  */

 LWS_VISIBLE unsigned char *
 libwebsockets_SHA1(const unsigned char *d, size_t n, unsigned char *md)
 {
 	struct sha1_ctxt ctx;

 	sha1_init(&ctx);
 	sha1_loop(&ctx, d, n);
 	sha1_result(&ctx, (void *)md);

 	return md;
 }

 #endif /*unsupported*/
	/*
	* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
	* All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions
	* are met:
	* 1. Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	* 2. Redistributions in binary form must reproduce the above copyright
	* notice, this list of conditions and the following disclaimer in the
	* documentation and/or other materials provided with the distribution.
	* 3. Neither the name of the project nor the names of its contributors
	* may be used to endorse or promote products derived from this software
	* without specific prior written permission.
	*
	* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	* SUCH DAMAGE.
	*/
	/*
	* FIPS pub 180-1: Secure Hash Algorithm (SHA-1)
	* based on: http://csrc.nist.gov/fips/fip180-1.txt
	* implemented by Jun-ichiro itojun Itoh <itojun@itojun.org>
	*/

	#include "private-libwebsockets.h"

	#ifdef HAVE_SYS_TYPES_H
	#include <sys/types.h>
	#endif

	struct sha1_ctxt {
	union {
	unsigned char b8[20];
	unsigned int b32[5];
	} h;
	union {
	unsigned char b8[8];
	u_int64_t b64[1];
	} c;
	union {
	unsigned char b8[64];
	unsigned int b32[16];
	} m;
	unsigned char count;
	};

	/* sanity check */
	#if !defined(BYTE_ORDER) \|\| !defined(LITTLE_ENDIAN) \|\| !defined(BIG_ENDIAN)
	# define unsupported 1
	#elif BYTE_ORDER != BIG_ENDIAN
	# if BYTE_ORDER != LITTLE_ENDIAN
	# define unsupported 1
	# endif
	#endif

	#ifndef unsupported

	/* constant table */
	static const unsigned int _K[] =
	{ 0x5a827999, 0x6ed9eba1, 0x8f1bbcdc, 0xca62c1d6 };
	#define K(t) _K[(t) / 20]

	#define F0(b, c, d) (((b) & (c)) \| ((~(b)) & (d)))
	#define F1(b, c, d) (((b) ^ (c)) ^ (d))
	#define F2(b, c, d) (((b) & (c)) \| ((b) & (d)) \| ((c) & (d)))
	#define F3(b, c, d) (((b) ^ (c)) ^ (d))

	#define S(n, x) (((x) << (n)) \| ((x) >> (32 - n)))

	#define H(n) (ctxt->h.b32[(n)])
	#define COUNT (ctxt->count)
	#define BCOUNT (ctxt->c.b64[0] / 8)
	#define W(n) (ctxt->m.b32[(n)])

	#define PUTBYTE(x) { \
	ctxt->m.b8[(COUNT % 64)] = (x); \
	COUNT++; \
	COUNT %= 64; \
	ctxt->c.b64[0] += 8; \
	if (COUNT % 64 == 0) \
	sha1_step(ctxt); \
	}

	#define PUTPAD(x) { \
	ctxt->m.b8[(COUNT % 64)] = (x); \
	COUNT++; \
	COUNT %= 64; \
	if (COUNT % 64 == 0) \
	sha1_step(ctxt); \
	}

	static void sha1_step __P((struct sha1_ctxt *));

	static void
	sha1_step(struct sha1_ctxt *ctxt)
	{
	unsigned int a, b, c, d, e, tmp;
	size_t t, s;

	#if BYTE_ORDER == LITTLE_ENDIAN
	struct sha1_ctxt tctxt;

	memcpy(&tctxt.m.b8[0], &ctxt->m.b8[0], 64);
	ctxt->m.b8[0] = tctxt.m.b8[3]; ctxt->m.b8[1] = tctxt.m.b8[2];
	ctxt->m.b8[2] = tctxt.m.b8[1]; ctxt->m.b8[3] = tctxt.m.b8[0];
	ctxt->m.b8[4] = tctxt.m.b8[7]; ctxt->m.b8[5] = tctxt.m.b8[6];
	ctxt->m.b8[6] = tctxt.m.b8[5]; ctxt->m.b8[7] = tctxt.m.b8[4];
	ctxt->m.b8[8] = tctxt.m.b8[11]; ctxt->m.b8[9] = tctxt.m.b8[10];
	ctxt->m.b8[10] = tctxt.m.b8[9]; ctxt->m.b8[11] = tctxt.m.b8[8];
	ctxt->m.b8[12] = tctxt.m.b8[15]; ctxt->m.b8[13] = tctxt.m.b8[14];
	ctxt->m.b8[14] = tctxt.m.b8[13]; ctxt->m.b8[15] = tctxt.m.b8[12];
	ctxt->m.b8[16] = tctxt.m.b8[19]; ctxt->m.b8[17] = tctxt.m.b8[18];
	ctxt->m.b8[18] = tctxt.m.b8[17]; ctxt->m.b8[19] = tctxt.m.b8[16];
	ctxt->m.b8[20] = tctxt.m.b8[23]; ctxt->m.b8[21] = tctxt.m.b8[22];
	ctxt->m.b8[22] = tctxt.m.b8[21]; ctxt->m.b8[23] = tctxt.m.b8[20];
	ctxt->m.b8[24] = tctxt.m.b8[27]; ctxt->m.b8[25] = tctxt.m.b8[26];
	ctxt->m.b8[26] = tctxt.m.b8[25]; ctxt->m.b8[27] = tctxt.m.b8[24];
	ctxt->m.b8[28] = tctxt.m.b8[31]; ctxt->m.b8[29] = tctxt.m.b8[30];
	ctxt->m.b8[30] = tctxt.m.b8[29]; ctxt->m.b8[31] = tctxt.m.b8[28];
	ctxt->m.b8[32] = tctxt.m.b8[35]; ctxt->m.b8[33] = tctxt.m.b8[34];
	ctxt->m.b8[34] = tctxt.m.b8[33]; ctxt->m.b8[35] = tctxt.m.b8[32];
	ctxt->m.b8[36] = tctxt.m.b8[39]; ctxt->m.b8[37] = tctxt.m.b8[38];
	ctxt->m.b8[38] = tctxt.m.b8[37]; ctxt->m.b8[39] = tctxt.m.b8[36];
	ctxt->m.b8[40] = tctxt.m.b8[43]; ctxt->m.b8[41] = tctxt.m.b8[42];
	ctxt->m.b8[42] = tctxt.m.b8[41]; ctxt->m.b8[43] = tctxt.m.b8[40];
	ctxt->m.b8[44] = tctxt.m.b8[47]; ctxt->m.b8[45] = tctxt.m.b8[46];
	ctxt->m.b8[46] = tctxt.m.b8[45]; ctxt->m.b8[47] = tctxt.m.b8[44];
	ctxt->m.b8[48] = tctxt.m.b8[51]; ctxt->m.b8[49] = tctxt.m.b8[50];
	ctxt->m.b8[50] = tctxt.m.b8[49]; ctxt->m.b8[51] = tctxt.m.b8[48];
	ctxt->m.b8[52] = tctxt.m.b8[55]; ctxt->m.b8[53] = tctxt.m.b8[54];
	ctxt->m.b8[54] = tctxt.m.b8[53]; ctxt->m.b8[55] = tctxt.m.b8[52];
	ctxt->m.b8[56] = tctxt.m.b8[59]; ctxt->m.b8[57] = tctxt.m.b8[58];
	ctxt->m.b8[58] = tctxt.m.b8[57]; ctxt->m.b8[59] = tctxt.m.b8[56];
	ctxt->m.b8[60] = tctxt.m.b8[63]; ctxt->m.b8[61] = tctxt.m.b8[62];
	ctxt->m.b8[62] = tctxt.m.b8[61]; ctxt->m.b8[63] = tctxt.m.b8[60];
	#endif

	a = H(0); b = H(1); c = H(2); d = H(3); e = H(4);

	for (t = 0; t < 20; t++) {
	s = t & 0x0f;
	if (t >= 16)
	W(s) = S(1, W((s+13) & 0x0f) ^ W((s+8) & 0x0f) ^
	W((s+2) & 0x0f) ^ W(s));

	tmp = S(5, a) + F0(b, c, d) + e + W(s) + K(t);
	e = d; d = c; c = S(30, b); b = a; a = tmp;
	}
	for (t = 20; t < 40; t++) {
	s = t & 0x0f;
	W(s) = S(1, W((s+13) & 0x0f) ^ W((s+8) & 0x0f) ^
	W((s+2) & 0x0f) ^ W(s));
	tmp = S(5, a) + F1(b, c, d) + e + W(s) + K(t);
	e = d; d = c; c = S(30, b); b = a; a = tmp;
	}
	for (t = 40; t < 60; t++) {
	s = t & 0x0f;
	W(s) = S(1, W((s+13) & 0x0f) ^ W((s+8) & 0x0f) ^
	W((s+2) & 0x0f) ^ W(s));
	tmp = S(5, a) + F2(b, c, d) + e + W(s) + K(t);
	e = d; d = c; c = S(30, b); b = a; a = tmp;
	}
	for (t = 60; t < 80; t++) {
	s = t & 0x0f;
	W(s) = S(1, W((s+13) & 0x0f) ^ W((s+8) & 0x0f) ^
	W((s+2) & 0x0f) ^ W(s));
	tmp = S(5, a) + F3(b, c, d) + e + W(s) + K(t);
	e = d; d = c; c = S(30, b); b = a; a = tmp;
	}

	H(0) = H(0) + a;
	H(1) = H(1) + b;
	H(2) = H(2) + c;
	H(3) = H(3) + d;
	H(4) = H(4) + e;

	bzero(&ctxt->m.b8[0], 64);
	}

	/------------------------------------------------------------/

	static void
	sha1_init(struct sha1_ctxt *ctxt)
	{
	bzero(ctxt, sizeof(struct sha1_ctxt));
	H(0) = 0x67452301;
	H(1) = 0xefcdab89;
	H(2) = 0x98badcfe;
	H(3) = 0x10325476;
	H(4) = 0xc3d2e1f0;
	}

	void
	sha1_pad(struct sha1_ctxt *ctxt)
	{
	size_t padlen; /pad length in bytes/
	size_t padstart;

	PUTPAD(0x80);

	padstart = COUNT % 64;
	padlen = 64 - padstart;
	if (padlen < 8) {
	bzero(&ctxt->m.b8[padstart], padlen);
	COUNT += padlen;
	COUNT %= 64;
	sha1_step(ctxt);
	padstart = COUNT % 64; /* should be 0 */
	padlen = 64 - padstart; /* should be 64 */
	}
	bzero(&ctxt->m.b8[padstart], padlen - 8);
	COUNT += (padlen - 8);
	COUNT %= 64;
	#if BYTE_ORDER == BIG_ENDIAN
	PUTPAD(ctxt->c.b8[0]); PUTPAD(ctxt->c.b8[1]);
	PUTPAD(ctxt->c.b8[2]); PUTPAD(ctxt->c.b8[3]);
	PUTPAD(ctxt->c.b8[4]); PUTPAD(ctxt->c.b8[5]);
	PUTPAD(ctxt->c.b8[6]); PUTPAD(ctxt->c.b8[7]);
	#else
	PUTPAD(ctxt->c.b8[7]); PUTPAD(ctxt->c.b8[6]);
	PUTPAD(ctxt->c.b8[5]); PUTPAD(ctxt->c.b8[4]);
	PUTPAD(ctxt->c.b8[3]); PUTPAD(ctxt->c.b8[2]);
	PUTPAD(ctxt->c.b8[1]); PUTPAD(ctxt->c.b8[0]);
	#endif
	}

	void
	sha1_loop(struct sha1_ctxt ctxt, const unsigned char input, size_t len)
	{
	size_t gaplen;
	size_t gapstart;
	size_t off;
	size_t copysiz;

	off = 0;

	while (off < len) {
	gapstart = COUNT % 64;
	gaplen = 64 - gapstart;

	copysiz = (gaplen < len - off) ? gaplen : len - off;
	memcpy(&ctxt->m.b8[gapstart], &input[off], copysiz);
	COUNT += copysiz;
	COUNT %= 64;
	ctxt->c.b64[0] += copysiz * 8;
	if (COUNT % 64 == 0)
	sha1_step(ctxt);
	off += copysiz;
	}
	}

	void
	sha1_result(struct sha1_ctxt ctxt, void digest0)
	{
	unsigned char *digest;

	digest = (unsigned char *)digest0;
	sha1_pad(ctxt);
	#if BYTE_ORDER == BIG_ENDIAN
	memcpy(digest, &ctxt->h.b8[0], 20);
	#else
	digest[0] = ctxt->h.b8[3]; digest[1] = ctxt->h.b8[2];
	digest[2] = ctxt->h.b8[1]; digest[3] = ctxt->h.b8[0];
	digest[4] = ctxt->h.b8[7]; digest[5] = ctxt->h.b8[6];
	digest[6] = ctxt->h.b8[5]; digest[7] = ctxt->h.b8[4];
	digest[8] = ctxt->h.b8[11]; digest[9] = ctxt->h.b8[10];
	digest[10] = ctxt->h.b8[9]; digest[11] = ctxt->h.b8[8];
	digest[12] = ctxt->h.b8[15]; digest[13] = ctxt->h.b8[14];
	digest[14] = ctxt->h.b8[13]; digest[15] = ctxt->h.b8[12];
	digest[16] = ctxt->h.b8[19]; digest[17] = ctxt->h.b8[18];
	digest[18] = ctxt->h.b8[17]; digest[19] = ctxt->h.b8[16];
	#endif
	}

	/*
	* This should look and work like the libcrypto implementation
	*/

	LWS_VISIBLE unsigned char *
	libwebsockets_SHA1(const unsigned char d, size_t n, unsigned char md)
	{
	struct sha1_ctxt ctx;

	sha1_init(&ctx);
	sha1_loop(&ctx, d, n);
	sha1_result(&ctx, (void *)md);

	return md;
	}

	#endif /unsupported/