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/*
 * SHA1 hash implementation and interface functions
 * Copyright (c) 2003-2005, Jouni Malinen <jkmaline@cc.hut.fi>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * Alternatively, this software may be distributed under the terms of BSD
 * license.
 *
 * See README and COPYING for more details.
 */

#include "mvCommon.h"
#include "mvOs.h"
#include "mvSHA1.h"

#define SHA1HANDSOFF

typedef union {
	MV_U8 c[64];
	MV_U32 l[16];

} CHAR64LONG16;

static void mvSHA1Transform(MV_U32 state[5], const MV_U8 *buffer);

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

#ifdef MV_CPU_LE
#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 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);

/* Hash a single 512-bit block. This is the core of the algorithm. */
static void mvSHA1Transform(MV_U32 state[5], const MV_U8 *buffer)
{
	MV_U32 a, b, c, d, e;
	CHAR64LONG16 *block;

#ifdef SHA1HANDSOFF
	static MV_U32 workspace[16];

	block = (CHAR64LONG16 *) workspace;
	memcpy(block, buffer, 64);
#else
	block = (CHAR64LONG16 *) buffer;
#endif
	/* Copy context->state[] to working vars */
	a = state[0];
	b = state[1];
	c = state[2];
	d = state[3];
	e = state[4];
	/* 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);
	/* 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;
}

void mvSHA1Init(MV_SHA1_CTX *context)
{
	/* SHA1 initialization constants */
	context->state[0] = 0x67452301;
	context->state[1] = 0xEFCDAB89;
	context->state[2] = 0x98BADCFE;
	context->state[3] = 0x10325476;
	context->state[4] = 0xC3D2E1F0;
	context->count[0] = context->count[1] = 0;
}

/* Run your data through this. */
void mvSHA1Update(MV_SHA1_CTX *context, MV_U8 const *data, unsigned int len)
{
	MV_U32 i, j;

	j = (context->count[0] >> 3) & 63;
	context->count[0] += len << 3;
	if (context->count[0] < (len << 3))
		context->count[1]++;
	context->count[1] += (len >> 29);
	if ((j + len) > 63) {
		memcpy(&context->buffer[j], data, (i = 64 - j));
		mvSHA1Transform(context->state, context->buffer);
		for (; i + 63 < len; i += 64)
			mvSHA1Transform(context->state, &data[i]);
		j = 0;
	} else {
		i = 0;
	}
	memcpy(&context->buffer[j], &data[i], len - i);
}

void mvSHA1Final(MV_U8 *digest, MV_SHA1_CTX *context)
{
	MV_U32 i;
	MV_U8 finalcount[8];

	for (i = 0; i < 8; i++)
		finalcount[i] = (unsigned char)((context->count[(i >= 4 ? 0 : 1)] >> ((3 - (i & 3)) * 8)) & 255);
	/* Endian independent */

	mvSHA1Update(context, (const unsigned char *)"\200", 1);
	while ((context->count[0] & 504) != 448)
		mvSHA1Update(context, (const unsigned char *)"\0", 1);

	mvSHA1Update(context, finalcount, 8);	/* Should cause a mvSHA1Transform()
						 */
	for (i = 0; i < 20; i++) {
		digest[i] = (unsigned char)
		    ((context->state[i >> 2] >> ((3 - (i & 3)) * 8)) & 255);
	}
	/* Wipe variables */
	i = 0;
	memset(context->buffer, 0, 64);
	memset(context->state, 0, 20);
	memset(context->count, 0, 8);
	memset(finalcount, 0, 8);

#ifdef SHA1HANDSOFF		/* make SHA1Transform overwrite it's own static vars */
	mvSHA1Transform(context->state, context->buffer);
#endif
}

void mvSHA1(MV_U8 const *buf, unsigned int len, MV_U8 *digest)
{
	MV_SHA1_CTX ctx;

	mvSHA1Init(&ctx);
	mvSHA1Update(&ctx, buf, len);
	mvSHA1Final(digest, &ctx);
}