/* @(#)sha1.c	1.3 12/12/02 2009-2012 J. Schilling */
#include <schily/mconfig.h>
#ifndef lint
static	UConst char sccsid[] =
	"@(#)sha1.c	1.3 12/12/02 2009-2012 J. Schilling";
#endif
/*
 * SHA1 hash code taken from OpenBSD
 *
 * Portions Copyright (c) 2009-2012 J. Schilling
 */

/*	$OpenBSD: sha1.c,v 1.21 2008/07/29 19:32:50 miod Exp $	*/

/*
 * SHA-1 in C
 * By Steve Reid <steve@edmweb.com>
 * 100% Public Domain
 *
 * Test Vectors (from FIPS PUB 180-1)
 * "abc"
 *   A9993E36 4706816A BA3E2571 7850C26C 9CD0D89D
 * "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq"
 *   84983E44 1C3BD26E BAAE4AA1 F95129E5 E54670F1
 * A million repetitions of "a"
 *   34AA973C D4C4DAA4 F61EEB2B DBAD2731 6534016F
 */

#include <schily/standard.h>
#include <schily/string.h>
#include <schily/sha1.h>

#if !defined(HAVE_MEMCPY) || !defined(HAVE_MEMSET)
#include <schily/schily.h>
#endif
#if !defined(HAVE_MEMCPY) && !defined(memcpy)
#define	memcpy(s1, s2, n)	movebytes(s2, s1, n)
#endif
#if !defined(HAVE_MEMSET) && !defined(memset)
#define	memset(s, c, n)		fillbytes(s, n, c)
#endif


#define	rol(value, bits)	(((value) << (bits)) | ((value) >> (32 - (bits))))

/*
 * blk0() and blk() perform the initial expand.
 * I got the idea of expanding during the round function from SSLeay
 */
#ifndef	WORDS_BIGENDIAN
#define	blk0(i) (block->l[i] = (rol(block->l[i], 24)&0xFF00FF00) \
				|(rol(block->l[i], 8)&0x00FF00FF))
#else
#define	blk0(i) block->l[i]
#endif
#define	blk(i) (block->l[i&15] = rol(block->l[(i+13)&15]^block->l[(i+8)&15] \
				^block->l[(i+2)&15]^block->l[i&15], 1))

/*
 * (R0+R1), R2, R3, R4 are the different operations (rounds) used in SHA1
 */
#define	R0(v, w, x, y, z, i)	z += ((w&(x^y))^y)+blk0(i)+0x5A827999+rol(v, 5); w = rol(w, 30);
#define	R1(v, w, x, y, z, i)	z += ((w&(x^y))^y)+blk(i)+0x5A827999+rol(v, 5); w = rol(w, 30);
#define	R2(v, w, x, y, z, i)	z += (w^x^y)+blk(i)+0x6ED9EBA1+rol(v, 5); w = rol(w, 30);
#define	R3(v, w, x, y, z, i)	z += (((w|x)&y)|(w&x))+blk(i)+0x8F1BBCDC+rol(v, 5); w = rol(w, 30);
#define	R4(v, w, x, y, z, i)	z += (w^x^y)+blk(i)+0xCA62C1D6+rol(v, 5); w = rol(w, 30);

typedef union {
	UInt8_t  c[64];
	UInt32_t l[16];
} CHAR64LONG16;

#ifdef __sh__
static void do_R01(UInt32_t *a, UInt32_t *b, UInt32_t *c, UInt32_t *d, UInt32_t *e, CHAR64LONG16 *);
static void do_R2(UInt32_t *a, UInt32_t *b, UInt32_t *c, UInt32_t *d, UInt32_t *e, CHAR64LONG16 *);
static void do_R3(UInt32_t *a, UInt32_t *b, UInt32_t *c, UInt32_t *d, UInt32_t *e, CHAR64LONG16 *);
static void do_R4(UInt32_t *a, UInt32_t *b, UInt32_t *c, UInt32_t *d, UInt32_t *e, CHAR64LONG16 *);

#define	nR0(v, w, x, y, z, i)	R0(*v, *w, *x, *y, *z, i)
#define	nR1(v, w, x, y, z, i)	R1(*v, *w, *x, *y, *z, i)
#define	nR2(v, w, x, y, z, i)	R2(*v, *w, *x, *y, *z, i)
#define	nR3(v, w, x, y, z, i)	R3(*v, *w, *x, *y, *z, i)
#define	nR4(v, w, x, y, z, i)	R4(*v, *w, *x, *y, *z, i)

/* BEGIN CSTYLED */
static void
do_R01(UInt32_t *a, UInt32_t *b, UInt32_t *c, UInt32_t *d, UInt32_t *e, CHAR64LONG16 *block)
{
    nR0(a,b,c,d,e, 0); nR0(e,a,b,c,d, 1); nR0(d,e,a,b,c, 2); nR0(c,d,e,a,b, 3);
    nR0(b,c,d,e,a, 4); nR0(a,b,c,d,e, 5); nR0(e,a,b,c,d, 6); nR0(d,e,a,b,c, 7);
    nR0(c,d,e,a,b, 8); nR0(b,c,d,e,a, 9); nR0(a,b,c,d,e,10); nR0(e,a,b,c,d,11);
    nR0(d,e,a,b,c,12); nR0(c,d,e,a,b,13); nR0(b,c,d,e,a,14); nR0(a,b,c,d,e,15);
    nR1(e,a,b,c,d,16); nR1(d,e,a,b,c,17); nR1(c,d,e,a,b,18); nR1(b,c,d,e,a,19);
}

static void
do_R2(UInt32_t *a, UInt32_t *b, UInt32_t *c, UInt32_t *d, UInt32_t *e, CHAR64LONG16 *block)
{
    nR2(a,b,c,d,e,20); nR2(e,a,b,c,d,21); nR2(d,e,a,b,c,22); nR2(c,d,e,a,b,23);
    nR2(b,c,d,e,a,24); nR2(a,b,c,d,e,25); nR2(e,a,b,c,d,26); nR2(d,e,a,b,c,27);
    nR2(c,d,e,a,b,28); nR2(b,c,d,e,a,29); nR2(a,b,c,d,e,30); nR2(e,a,b,c,d,31);
    nR2(d,e,a,b,c,32); nR2(c,d,e,a,b,33); nR2(b,c,d,e,a,34); nR2(a,b,c,d,e,35);
    nR2(e,a,b,c,d,36); nR2(d,e,a,b,c,37); nR2(c,d,e,a,b,38); nR2(b,c,d,e,a,39);
}

static void
do_R3(UInt32_t *a, UInt32_t *b, UInt32_t *c, UInt32_t *d, UInt32_t *e, CHAR64LONG16 *block)
{
    nR3(a,b,c,d,e,40); nR3(e,a,b,c,d,41); nR3(d,e,a,b,c,42); nR3(c,d,e,a,b,43);
    nR3(b,c,d,e,a,44); nR3(a,b,c,d,e,45); nR3(e,a,b,c,d,46); nR3(d,e,a,b,c,47);
    nR3(c,d,e,a,b,48); nR3(b,c,d,e,a,49); nR3(a,b,c,d,e,50); nR3(e,a,b,c,d,51);
    nR3(d,e,a,b,c,52); nR3(c,d,e,a,b,53); nR3(b,c,d,e,a,54); nR3(a,b,c,d,e,55);
    nR3(e,a,b,c,d,56); nR3(d,e,a,b,c,57); nR3(c,d,e,a,b,58); nR3(b,c,d,e,a,59);
}

static void
do_R4(UInt32_t *a, UInt32_t *b, UInt32_t *c, UInt32_t *d, UInt32_t *e, CHAR64LONG16 *block)
{
    nR4(a,b,c,d,e,60); nR4(e,a,b,c,d,61); nR4(d,e,a,b,c,62); nR4(c,d,e,a,b,63);
    nR4(b,c,d,e,a,64); nR4(a,b,c,d,e,65); nR4(e,a,b,c,d,66); nR4(d,e,a,b,c,67);
    nR4(c,d,e,a,b,68); nR4(b,c,d,e,a,69); nR4(a,b,c,d,e,70); nR4(e,a,b,c,d,71);
    nR4(d,e,a,b,c,72); nR4(c,d,e,a,b,73); nR4(b,c,d,e,a,74); nR4(a,b,c,d,e,75);
    nR4(e,a,b,c,d,76); nR4(d,e,a,b,c,77); nR4(c,d,e,a,b,78); nR4(b,c,d,e,a,79);
}
/* END CSTYLED */
#endif

/*
 * Hash a single 512-bit block. This is the core of the algorithm.
 */
EXPORT void
SHA1Transform(state, buffer)
		UInt32_t	state[5];
	const	UInt8_t		buffer[SHA1_BLOCK_LENGTH];
{
	UInt32_t a, b, c, d, e;
	UInt8_t workspace[SHA1_BLOCK_LENGTH];
	CHAR64LONG16 *block = (CHAR64LONG16 *)workspace;

	(void) memcpy(block, buffer, SHA1_BLOCK_LENGTH);

	/* Copy context->state[] to working vars */
	a = state[0];
	b = state[1];
	c = state[2];
	d = state[3];
	e = state[4];

#ifdef __sh__
	do_R01(&a, &b, &c, &d, &e, block);
	do_R2(&a, &b, &c, &d, &e, block);
	do_R3(&a, &b, &c, &d, &e, block);
	do_R4(&a, &b, &c, &d, &e, block);
#else
	/* BEGIN CSTYLED */
	/* 4 rounds of 20 operations each. Loop unrolled. */
	R0(a,b,c,d,e, 0); R0(e,a,b,c,d, 1); R0(d,e,a,b,c, 2); R0(c,d,e,a,b, 3);
	R0(b,c,d,e,a, 4); R0(a,b,c,d,e, 5); R0(e,a,b,c,d, 6); R0(d,e,a,b,c, 7);
	R0(c,d,e,a,b, 8); R0(b,c,d,e,a, 9); R0(a,b,c,d,e,10); R0(e,a,b,c,d,11);
	R0(d,e,a,b,c,12); R0(c,d,e,a,b,13); R0(b,c,d,e,a,14); R0(a,b,c,d,e,15);
	R1(e,a,b,c,d,16); R1(d,e,a,b,c,17); R1(c,d,e,a,b,18); R1(b,c,d,e,a,19);
	R2(a,b,c,d,e,20); R2(e,a,b,c,d,21); R2(d,e,a,b,c,22); R2(c,d,e,a,b,23);
	R2(b,c,d,e,a,24); R2(a,b,c,d,e,25); R2(e,a,b,c,d,26); R2(d,e,a,b,c,27);
	R2(c,d,e,a,b,28); R2(b,c,d,e,a,29); R2(a,b,c,d,e,30); R2(e,a,b,c,d,31);
	R2(d,e,a,b,c,32); R2(c,d,e,a,b,33); R2(b,c,d,e,a,34); R2(a,b,c,d,e,35);
	R2(e,a,b,c,d,36); R2(d,e,a,b,c,37); R2(c,d,e,a,b,38); R2(b,c,d,e,a,39);
	R3(a,b,c,d,e,40); R3(e,a,b,c,d,41); R3(d,e,a,b,c,42); R3(c,d,e,a,b,43);
	R3(b,c,d,e,a,44); R3(a,b,c,d,e,45); R3(e,a,b,c,d,46); R3(d,e,a,b,c,47);
	R3(c,d,e,a,b,48); R3(b,c,d,e,a,49); R3(a,b,c,d,e,50); R3(e,a,b,c,d,51);
	R3(d,e,a,b,c,52); R3(c,d,e,a,b,53); R3(b,c,d,e,a,54); R3(a,b,c,d,e,55);
	R3(e,a,b,c,d,56); R3(d,e,a,b,c,57); R3(c,d,e,a,b,58); R3(b,c,d,e,a,59);
	R4(a,b,c,d,e,60); R4(e,a,b,c,d,61); R4(d,e,a,b,c,62); R4(c,d,e,a,b,63);
	R4(b,c,d,e,a,64); R4(a,b,c,d,e,65); R4(e,a,b,c,d,66); R4(d,e,a,b,c,67);
	R4(c,d,e,a,b,68); R4(b,c,d,e,a,69); R4(a,b,c,d,e,70); R4(e,a,b,c,d,71);
	R4(d,e,a,b,c,72); R4(c,d,e,a,b,73); R4(b,c,d,e,a,74); R4(a,b,c,d,e,75);
	R4(e,a,b,c,d,76); R4(d,e,a,b,c,77); R4(c,d,e,a,b,78); R4(b,c,d,e,a,79);
	/* END CSTYLED */
#endif

	/* Add the working vars back into context.state[] */
	state[0] += a;
	state[1] += b;
	state[2] += c;
	state[3] += d;
	state[4] += e;

	/* Wipe variables */
	a = b = c = d = e = 0;
}


/*
 * SHA1Init - Initialize new context
 */
EXPORT void
SHA1Init(context)
	SHA1_CTX	*context;
{

	/* SHA1 initialization constants */
	context->count[0] = context->count[1] = 0;
	context->state[0] = 0x67452301;
	context->state[1] = 0xEFCDAB89;
	context->state[2] = 0x98BADCFE;
	context->state[3] = 0x10325476;
	context->state[4] = 0xC3D2E1F0;
}


/*
 * Run your data through this.
 */
EXPORT void
SHA1Update(context, data, len)
		SHA1_CTX	*context;
	const	UInt8_t		*data;
		size_t		len;
{
	size_t i, j;

	j = (size_t)((context->count[0] >> 3) & 63);
	if ((context->count[0] += (UInt32_t)len << 3) < ((UInt32_t)len << 3))
		context->count[1] += 1;
	if ((j + len) > 63) {
		(void) memcpy(&context->buffer[j], data, (i = 64-j));
		SHA1Transform(context->state, context->buffer);
		for (; i + 63 < len; i += 64)
			SHA1Transform(context->state, (UInt8_t *)&data[i]);
		j = 0;
	} else {
		i = 0;
	}
	(void) memcpy(&context->buffer[j], &data[i], len - i);
}


/*
 * Add padding and return the message digest.
 */
EXPORT void
SHA1Pad(context)
	SHA1_CTX	*context;
{
	UInt8_t finalcount[8];
	u_int i;

	for (i = 0; i < 8; i++) {
		finalcount[i] = (UInt8_t)((context->count[1- (i / 4)] >>
		    (((7 - (i & 7)) * 8)%32)) & 255);	/* Endian independent */
	}
	SHA1Update(context, (UInt8_t *)"\200", 1);
	while ((context->count[0] & 504) != 448)
		SHA1Update(context, (UInt8_t *)"\0", 1);
	SHA1Update(context, finalcount, 8); /* Should cause a SHA1Transform() */
}

EXPORT void
SHA1Final(digest, context)
	UInt8_t		digest[SHA1_DIGEST_LENGTH];
	SHA1_CTX	*context;
{
	u_int i;

	SHA1Pad(context);
	if (digest) {
		for (i = 0; i < SHA1_DIGEST_LENGTH; i++) {
			digest[i] = (UInt8_t)
			    ((context->state[i>>2] >> ((3-(i & 3)) * 8)) & 255);
		}
		memset(context, 0, sizeof (*context));
	}
}
