crc/sha256.c - platform/external/fio - Gitiles

 /*
  * Cryptographic API.
  *
  * SHA-256, as specified in
  * http://csrc.nist.gov/cryptval/shs/sha256-384-512.pdf
  *
  * SHA-256 code by Jean-Luc Cooke <jlcooke@certainkey.com>.
  *
  * Copyright (c) Jean-Luc Cooke <jlcooke@certainkey.com>
  * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
  * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
  *
  * 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.
  *
  */
 #include <string.h>
 #include <inttypes.h>

 #include "../lib/bswap.h"
 #include "sha256.h"

 #define SHA256_DIGEST_SIZE	32
 #define SHA256_HMAC_BLOCK_SIZE	64

 static inline uint32_t Ch(uint32_t x, uint32_t y, uint32_t z)
 {
 	return z ^ (x & (y ^ z));
 }

 static inline uint32_t Maj(uint32_t x, uint32_t y, uint32_t z)
 {
 	return (x & y) | (z & (x | y));
 }

 #define e0(x)       (ror32(x, 2) ^ ror32(x,13) ^ ror32(x,22))
 #define e1(x)       (ror32(x, 6) ^ ror32(x,11) ^ ror32(x,25))
 #define s0(x)       (ror32(x, 7) ^ ror32(x,18) ^ (x >> 3))
 #define s1(x)       (ror32(x,17) ^ ror32(x,19) ^ (x >> 10))

 #define H0         0x6a09e667
 #define H1         0xbb67ae85
 #define H2         0x3c6ef372
 #define H3         0xa54ff53a
 #define H4         0x510e527f
 #define H5         0x9b05688c
 #define H6         0x1f83d9ab
 #define H7         0x5be0cd19

 static inline uint32_t ror32(uint32_t word, unsigned int shift)
 {
 	 return (word >> shift) | (word << (32 - shift));
 }

 static inline void LOAD_OP(int I, uint32_t *W, const uint8_t *input)
 {
 	W[I] = __be32_to_cpu(((uint32_t *)(input))[I]);
 }

 static inline void BLEND_OP(int I, uint32_t *W)
 {
 	W[I] = s1(W[I-2]) + W[I-7] + s0(W[I-15]) + W[I-16];
 }

 static void sha256_transform(uint32_t *state, const uint8_t *input)
 {
 	uint32_t a, b, c, d, e, f, g, h, t1, t2;
 	uint32_t W[64];
 	int i;

 	/* load the input */
 	for (i = 0; i < 16; i++)
 		LOAD_OP(i, W, input);

 	/* now blend */
 	for (i = 16; i < 64; i++)
 		BLEND_OP(i, W);

 	/* load the state into our registers */
 	a=state[0];  b=state[1];  c=state[2];  d=state[3];
 	e=state[4];  f=state[5];  g=state[6];  h=state[7];

 	/* now iterate */
 	t1 = h + e1(e) + Ch(e,f,g) + 0x428a2f98 + W[ 0];
 	t2 = e0(a) + Maj(a,b,c);    d+=t1;    h=t1+t2;
 	t1 = g + e1(d) + Ch(d,e,f) + 0x71374491 + W[ 1];
 	t2 = e0(h) + Maj(h,a,b);    c+=t1;    g=t1+t2;
 	t1 = f + e1(c) + Ch(c,d,e) + 0xb5c0fbcf + W[ 2];
 	t2 = e0(g) + Maj(g,h,a);    b+=t1;    f=t1+t2;
 	t1 = e + e1(b) + Ch(b,c,d) + 0xe9b5dba5 + W[ 3];
 	t2 = e0(f) + Maj(f,g,h);    a+=t1;    e=t1+t2;
 	t1 = d + e1(a) + Ch(a,b,c) + 0x3956c25b + W[ 4];
 	t2 = e0(e) + Maj(e,f,g);    h+=t1;    d=t1+t2;
 	t1 = c + e1(h) + Ch(h,a,b) + 0x59f111f1 + W[ 5];
 	t2 = e0(d) + Maj(d,e,f);    g+=t1;    c=t1+t2;
 	t1 = b + e1(g) + Ch(g,h,a) + 0x923f82a4 + W[ 6];
 	t2 = e0(c) + Maj(c,d,e);    f+=t1;    b=t1+t2;
 	t1 = a + e1(f) + Ch(f,g,h) + 0xab1c5ed5 + W[ 7];
 	t2 = e0(b) + Maj(b,c,d);    e+=t1;    a=t1+t2;

 	t1 = h + e1(e) + Ch(e,f,g) + 0xd807aa98 + W[ 8];
 	t2 = e0(a) + Maj(a,b,c);    d+=t1;    h=t1+t2;
 	t1 = g + e1(d) + Ch(d,e,f) + 0x12835b01 + W[ 9];
 	t2 = e0(h) + Maj(h,a,b);    c+=t1;    g=t1+t2;
 	t1 = f + e1(c) + Ch(c,d,e) + 0x243185be + W[10];
 	t2 = e0(g) + Maj(g,h,a);    b+=t1;    f=t1+t2;
 	t1 = e + e1(b) + Ch(b,c,d) + 0x550c7dc3 + W[11];
 	t2 = e0(f) + Maj(f,g,h);    a+=t1;    e=t1+t2;
 	t1 = d + e1(a) + Ch(a,b,c) + 0x72be5d74 + W[12];
 	t2 = e0(e) + Maj(e,f,g);    h+=t1;    d=t1+t2;
 	t1 = c + e1(h) + Ch(h,a,b) + 0x80deb1fe + W[13];
 	t2 = e0(d) + Maj(d,e,f);    g+=t1;    c=t1+t2;
 	t1 = b + e1(g) + Ch(g,h,a) + 0x9bdc06a7 + W[14];
 	t2 = e0(c) + Maj(c,d,e);    f+=t1;    b=t1+t2;
 	t1 = a + e1(f) + Ch(f,g,h) + 0xc19bf174 + W[15];
 	t2 = e0(b) + Maj(b,c,d);    e+=t1;    a=t1+t2;

 	t1 = h + e1(e) + Ch(e,f,g) + 0xe49b69c1 + W[16];
 	t2 = e0(a) + Maj(a,b,c);    d+=t1;    h=t1+t2;
 	t1 = g + e1(d) + Ch(d,e,f) + 0xefbe4786 + W[17];
 	t2 = e0(h) + Maj(h,a,b);    c+=t1;    g=t1+t2;
 	t1 = f + e1(c) + Ch(c,d,e) + 0x0fc19dc6 + W[18];
 	t2 = e0(g) + Maj(g,h,a);    b+=t1;    f=t1+t2;
 	t1 = e + e1(b) + Ch(b,c,d) + 0x240ca1cc + W[19];
 	t2 = e0(f) + Maj(f,g,h);    a+=t1;    e=t1+t2;
 	t1 = d + e1(a) + Ch(a,b,c) + 0x2de92c6f + W[20];
 	t2 = e0(e) + Maj(e,f,g);    h+=t1;    d=t1+t2;
 	t1 = c + e1(h) + Ch(h,a,b) + 0x4a7484aa + W[21];
 	t2 = e0(d) + Maj(d,e,f);    g+=t1;    c=t1+t2;
 	t1 = b + e1(g) + Ch(g,h,a) + 0x5cb0a9dc + W[22];
 	t2 = e0(c) + Maj(c,d,e);    f+=t1;    b=t1+t2;
 	t1 = a + e1(f) + Ch(f,g,h) + 0x76f988da + W[23];
 	t2 = e0(b) + Maj(b,c,d);    e+=t1;    a=t1+t2;

 	t1 = h + e1(e) + Ch(e,f,g) + 0x983e5152 + W[24];
 	t2 = e0(a) + Maj(a,b,c);    d+=t1;    h=t1+t2;
 	t1 = g + e1(d) + Ch(d,e,f) + 0xa831c66d + W[25];
 	t2 = e0(h) + Maj(h,a,b);    c+=t1;    g=t1+t2;
 	t1 = f + e1(c) + Ch(c,d,e) + 0xb00327c8 + W[26];
 	t2 = e0(g) + Maj(g,h,a);    b+=t1;    f=t1+t2;
 	t1 = e + e1(b) + Ch(b,c,d) + 0xbf597fc7 + W[27];
 	t2 = e0(f) + Maj(f,g,h);    a+=t1;    e=t1+t2;
 	t1 = d + e1(a) + Ch(a,b,c) + 0xc6e00bf3 + W[28];
 	t2 = e0(e) + Maj(e,f,g);    h+=t1;    d=t1+t2;
 	t1 = c + e1(h) + Ch(h,a,b) + 0xd5a79147 + W[29];
 	t2 = e0(d) + Maj(d,e,f);    g+=t1;    c=t1+t2;
 	t1 = b + e1(g) + Ch(g,h,a) + 0x06ca6351 + W[30];
 	t2 = e0(c) + Maj(c,d,e);    f+=t1;    b=t1+t2;
 	t1 = a + e1(f) + Ch(f,g,h) + 0x14292967 + W[31];
 	t2 = e0(b) + Maj(b,c,d);    e+=t1;    a=t1+t2;

 	t1 = h + e1(e) + Ch(e,f,g) + 0x27b70a85 + W[32];
 	t2 = e0(a) + Maj(a,b,c);    d+=t1;    h=t1+t2;
 	t1 = g + e1(d) + Ch(d,e,f) + 0x2e1b2138 + W[33];
 	t2 = e0(h) + Maj(h,a,b);    c+=t1;    g=t1+t2;
 	t1 = f + e1(c) + Ch(c,d,e) + 0x4d2c6dfc + W[34];
 	t2 = e0(g) + Maj(g,h,a);    b+=t1;    f=t1+t2;
 	t1 = e + e1(b) + Ch(b,c,d) + 0x53380d13 + W[35];
 	t2 = e0(f) + Maj(f,g,h);    a+=t1;    e=t1+t2;
 	t1 = d + e1(a) + Ch(a,b,c) + 0x650a7354 + W[36];
 	t2 = e0(e) + Maj(e,f,g);    h+=t1;    d=t1+t2;
 	t1 = c + e1(h) + Ch(h,a,b) + 0x766a0abb + W[37];
 	t2 = e0(d) + Maj(d,e,f);    g+=t1;    c=t1+t2;
 	t1 = b + e1(g) + Ch(g,h,a) + 0x81c2c92e + W[38];
 	t2 = e0(c) + Maj(c,d,e);    f+=t1;    b=t1+t2;
 	t1 = a + e1(f) + Ch(f,g,h) + 0x92722c85 + W[39];
 	t2 = e0(b) + Maj(b,c,d);    e+=t1;    a=t1+t2;

 	t1 = h + e1(e) + Ch(e,f,g) + 0xa2bfe8a1 + W[40];
 	t2 = e0(a) + Maj(a,b,c);    d+=t1;    h=t1+t2;
 	t1 = g + e1(d) + Ch(d,e,f) + 0xa81a664b + W[41];
 	t2 = e0(h) + Maj(h,a,b);    c+=t1;    g=t1+t2;
 	t1 = f + e1(c) + Ch(c,d,e) + 0xc24b8b70 + W[42];
 	t2 = e0(g) + Maj(g,h,a);    b+=t1;    f=t1+t2;
 	t1 = e + e1(b) + Ch(b,c,d) + 0xc76c51a3 + W[43];
 	t2 = e0(f) + Maj(f,g,h);    a+=t1;    e=t1+t2;
 	t1 = d + e1(a) + Ch(a,b,c) + 0xd192e819 + W[44];
 	t2 = e0(e) + Maj(e,f,g);    h+=t1;    d=t1+t2;
 	t1 = c + e1(h) + Ch(h,a,b) + 0xd6990624 + W[45];
 	t2 = e0(d) + Maj(d,e,f);    g+=t1;    c=t1+t2;
 	t1 = b + e1(g) + Ch(g,h,a) + 0xf40e3585 + W[46];
 	t2 = e0(c) + Maj(c,d,e);    f+=t1;    b=t1+t2;
 	t1 = a + e1(f) + Ch(f,g,h) + 0x106aa070 + W[47];
 	t2 = e0(b) + Maj(b,c,d);    e+=t1;    a=t1+t2;

 	t1 = h + e1(e) + Ch(e,f,g) + 0x19a4c116 + W[48];
 	t2 = e0(a) + Maj(a,b,c);    d+=t1;    h=t1+t2;
 	t1 = g + e1(d) + Ch(d,e,f) + 0x1e376c08 + W[49];
 	t2 = e0(h) + Maj(h,a,b);    c+=t1;    g=t1+t2;
 	t1 = f + e1(c) + Ch(c,d,e) + 0x2748774c + W[50];
 	t2 = e0(g) + Maj(g,h,a);    b+=t1;    f=t1+t2;
 	t1 = e + e1(b) + Ch(b,c,d) + 0x34b0bcb5 + W[51];
 	t2 = e0(f) + Maj(f,g,h);    a+=t1;    e=t1+t2;
 	t1 = d + e1(a) + Ch(a,b,c) + 0x391c0cb3 + W[52];
 	t2 = e0(e) + Maj(e,f,g);    h+=t1;    d=t1+t2;
 	t1 = c + e1(h) + Ch(h,a,b) + 0x4ed8aa4a + W[53];
 	t2 = e0(d) + Maj(d,e,f);    g+=t1;    c=t1+t2;
 	t1 = b + e1(g) + Ch(g,h,a) + 0x5b9cca4f + W[54];
 	t2 = e0(c) + Maj(c,d,e);    f+=t1;    b=t1+t2;
 	t1 = a + e1(f) + Ch(f,g,h) + 0x682e6ff3 + W[55];
 	t2 = e0(b) + Maj(b,c,d);    e+=t1;    a=t1+t2;

 	t1 = h + e1(e) + Ch(e,f,g) + 0x748f82ee + W[56];
 	t2 = e0(a) + Maj(a,b,c);    d+=t1;    h=t1+t2;
 	t1 = g + e1(d) + Ch(d,e,f) + 0x78a5636f + W[57];
 	t2 = e0(h) + Maj(h,a,b);    c+=t1;    g=t1+t2;
 	t1 = f + e1(c) + Ch(c,d,e) + 0x84c87814 + W[58];
 	t2 = e0(g) + Maj(g,h,a);    b+=t1;    f=t1+t2;
 	t1 = e + e1(b) + Ch(b,c,d) + 0x8cc70208 + W[59];
 	t2 = e0(f) + Maj(f,g,h);    a+=t1;    e=t1+t2;
 	t1 = d + e1(a) + Ch(a,b,c) + 0x90befffa + W[60];
 	t2 = e0(e) + Maj(e,f,g);    h+=t1;    d=t1+t2;
 	t1 = c + e1(h) + Ch(h,a,b) + 0xa4506ceb + W[61];
 	t2 = e0(d) + Maj(d,e,f);    g+=t1;    c=t1+t2;
 	t1 = b + e1(g) + Ch(g,h,a) + 0xbef9a3f7 + W[62];
 	t2 = e0(c) + Maj(c,d,e);    f+=t1;    b=t1+t2;
 	t1 = a + e1(f) + Ch(f,g,h) + 0xc67178f2 + W[63];
 	t2 = e0(b) + Maj(b,c,d);    e+=t1;    a=t1+t2;

 	state[0] += a; state[1] += b; state[2] += c; state[3] += d;
 	state[4] += e; state[5] += f; state[6] += g; state[7] += h;

 	/* clear any sensitive info... */
 	a = b = c = d = e = f = g = h = t1 = t2 = 0;
 	memset(W, 0, 64 * sizeof(uint32_t));
 }

 void sha256_init(struct sha256_ctx *sctx)
 {
 	sctx->state[0] = H0;
 	sctx->state[1] = H1;
 	sctx->state[2] = H2;
 	sctx->state[3] = H3;
 	sctx->state[4] = H4;
 	sctx->state[5] = H5;
 	sctx->state[6] = H6;
 	sctx->state[7] = H7;
 	sctx->count[0] = sctx->count[1] = 0;
 }

 void sha256_update(struct sha256_ctx *sctx, const uint8_t *data,
 		   unsigned int len)
 {
 	unsigned int i, idx, part_len;

 	/* Compute number of bytes mod 128 */
 	idx = (unsigned int)((sctx->count[0] >> 3) & 0x3f);

 	/* Update number of bits */
 	if ((sctx->count[0] += (len << 3)) < (len << 3)) {
 		sctx->count[1]++;
 		sctx->count[1] += (len >> 29);
 	}

 	part_len = 64 - idx;

 	/* Transform as many times as possible. */
 	if (len >= part_len) {
 		memcpy(&sctx->buf[idx], data, part_len);
 		sha256_transform(sctx->state, sctx->buf);

 		for (i = part_len; i + 63 < len; i += 64)
 			sha256_transform(sctx->state, &data[i]);
 		idx = 0;
 	} else {
 		i = 0;
 	}

 	/* Buffer remaining input */
 	memcpy(&sctx->buf[idx], &data[i], len-i);
 }
	/*
	* Cryptographic API.
	*
	* SHA-256, as specified in
	* http://csrc.nist.gov/cryptval/shs/sha256-384-512.pdf
	*
	* SHA-256 code by Jean-Luc Cooke <jlcooke@certainkey.com>.
	*
	* Copyright (c) Jean-Luc Cooke <jlcooke@certainkey.com>
	* Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
	* Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
	*
	* 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.
	*
	*/
	#include <string.h>
	#include <inttypes.h>

	#include "../lib/bswap.h"
	#include "sha256.h"

	#define SHA256_DIGEST_SIZE 32
	#define SHA256_HMAC_BLOCK_SIZE 64

	static inline uint32_t Ch(uint32_t x, uint32_t y, uint32_t z)
	{
	return z ^ (x & (y ^ z));
	}

	static inline uint32_t Maj(uint32_t x, uint32_t y, uint32_t z)
	{
	return (x & y) \| (z & (x \| y));
	}

	#define e0(x) (ror32(x, 2) ^ ror32(x,13) ^ ror32(x,22))
	#define e1(x) (ror32(x, 6) ^ ror32(x,11) ^ ror32(x,25))
	#define s0(x) (ror32(x, 7) ^ ror32(x,18) ^ (x >> 3))
	#define s1(x) (ror32(x,17) ^ ror32(x,19) ^ (x >> 10))

	#define H0 0x6a09e667
	#define H1 0xbb67ae85
	#define H2 0x3c6ef372
	#define H3 0xa54ff53a
	#define H4 0x510e527f
	#define H5 0x9b05688c
	#define H6 0x1f83d9ab
	#define H7 0x5be0cd19

	static inline uint32_t ror32(uint32_t word, unsigned int shift)
	{
	return (word >> shift) \| (word << (32 - shift));
	}

	static inline void LOAD_OP(int I, uint32_t W, const uint8_t input)
	{
	W[I] = __be32_to_cpu(((uint32_t *)(input))[I]);
	}

	static inline void BLEND_OP(int I, uint32_t *W)
	{
	W[I] = s1(W[I-2]) + W[I-7] + s0(W[I-15]) + W[I-16];
	}

	static void sha256_transform(uint32_t state, const uint8_t input)
	{
	uint32_t a, b, c, d, e, f, g, h, t1, t2;
	uint32_t W[64];
	int i;

	/* load the input */
	for (i = 0; i < 16; i++)
	LOAD_OP(i, W, input);

	/* now blend */
	for (i = 16; i < 64; i++)
	BLEND_OP(i, W);

	/* load the state into our registers */
	a=state[0]; b=state[1]; c=state[2]; d=state[3];
	e=state[4]; f=state[5]; g=state[6]; h=state[7];

	/* now iterate */
	t1 = h + e1(e) + Ch(e,f,g) + 0x428a2f98 + W[ 0];
	t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2;
	t1 = g + e1(d) + Ch(d,e,f) + 0x71374491 + W[ 1];
	t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2;
	t1 = f + e1(c) + Ch(c,d,e) + 0xb5c0fbcf + W[ 2];
	t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2;
	t1 = e + e1(b) + Ch(b,c,d) + 0xe9b5dba5 + W[ 3];
	t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2;
	t1 = d + e1(a) + Ch(a,b,c) + 0x3956c25b + W[ 4];
	t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2;
	t1 = c + e1(h) + Ch(h,a,b) + 0x59f111f1 + W[ 5];
	t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2;
	t1 = b + e1(g) + Ch(g,h,a) + 0x923f82a4 + W[ 6];
	t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2;
	t1 = a + e1(f) + Ch(f,g,h) + 0xab1c5ed5 + W[ 7];
	t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2;

	t1 = h + e1(e) + Ch(e,f,g) + 0xd807aa98 + W[ 8];
	t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2;
	t1 = g + e1(d) + Ch(d,e,f) + 0x12835b01 + W[ 9];
	t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2;
	t1 = f + e1(c) + Ch(c,d,e) + 0x243185be + W[10];
	t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2;
	t1 = e + e1(b) + Ch(b,c,d) + 0x550c7dc3 + W[11];
	t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2;
	t1 = d + e1(a) + Ch(a,b,c) + 0x72be5d74 + W[12];
	t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2;
	t1 = c + e1(h) + Ch(h,a,b) + 0x80deb1fe + W[13];
	t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2;
	t1 = b + e1(g) + Ch(g,h,a) + 0x9bdc06a7 + W[14];
	t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2;
	t1 = a + e1(f) + Ch(f,g,h) + 0xc19bf174 + W[15];
	t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2;

	t1 = h + e1(e) + Ch(e,f,g) + 0xe49b69c1 + W[16];
	t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2;
	t1 = g + e1(d) + Ch(d,e,f) + 0xefbe4786 + W[17];
	t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2;
	t1 = f + e1(c) + Ch(c,d,e) + 0x0fc19dc6 + W[18];
	t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2;
	t1 = e + e1(b) + Ch(b,c,d) + 0x240ca1cc + W[19];
	t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2;
	t1 = d + e1(a) + Ch(a,b,c) + 0x2de92c6f + W[20];
	t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2;
	t1 = c + e1(h) + Ch(h,a,b) + 0x4a7484aa + W[21];
	t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2;
	t1 = b + e1(g) + Ch(g,h,a) + 0x5cb0a9dc + W[22];
	t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2;
	t1 = a + e1(f) + Ch(f,g,h) + 0x76f988da + W[23];
	t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2;

	t1 = h + e1(e) + Ch(e,f,g) + 0x983e5152 + W[24];
	t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2;
	t1 = g + e1(d) + Ch(d,e,f) + 0xa831c66d + W[25];
	t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2;
	t1 = f + e1(c) + Ch(c,d,e) + 0xb00327c8 + W[26];
	t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2;
	t1 = e + e1(b) + Ch(b,c,d) + 0xbf597fc7 + W[27];
	t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2;
	t1 = d + e1(a) + Ch(a,b,c) + 0xc6e00bf3 + W[28];
	t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2;
	t1 = c + e1(h) + Ch(h,a,b) + 0xd5a79147 + W[29];
	t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2;
	t1 = b + e1(g) + Ch(g,h,a) + 0x06ca6351 + W[30];
	t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2;
	t1 = a + e1(f) + Ch(f,g,h) + 0x14292967 + W[31];
	t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2;

	t1 = h + e1(e) + Ch(e,f,g) + 0x27b70a85 + W[32];
	t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2;
	t1 = g + e1(d) + Ch(d,e,f) + 0x2e1b2138 + W[33];
	t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2;
	t1 = f + e1(c) + Ch(c,d,e) + 0x4d2c6dfc + W[34];
	t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2;
	t1 = e + e1(b) + Ch(b,c,d) + 0x53380d13 + W[35];
	t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2;
	t1 = d + e1(a) + Ch(a,b,c) + 0x650a7354 + W[36];
	t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2;
	t1 = c + e1(h) + Ch(h,a,b) + 0x766a0abb + W[37];
	t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2;
	t1 = b + e1(g) + Ch(g,h,a) + 0x81c2c92e + W[38];
	t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2;
	t1 = a + e1(f) + Ch(f,g,h) + 0x92722c85 + W[39];
	t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2;

	t1 = h + e1(e) + Ch(e,f,g) + 0xa2bfe8a1 + W[40];
	t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2;
	t1 = g + e1(d) + Ch(d,e,f) + 0xa81a664b + W[41];
	t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2;
	t1 = f + e1(c) + Ch(c,d,e) + 0xc24b8b70 + W[42];
	t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2;
	t1 = e + e1(b) + Ch(b,c,d) + 0xc76c51a3 + W[43];
	t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2;
	t1 = d + e1(a) + Ch(a,b,c) + 0xd192e819 + W[44];
	t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2;
	t1 = c + e1(h) + Ch(h,a,b) + 0xd6990624 + W[45];
	t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2;
	t1 = b + e1(g) + Ch(g,h,a) + 0xf40e3585 + W[46];
	t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2;
	t1 = a + e1(f) + Ch(f,g,h) + 0x106aa070 + W[47];
	t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2;

	t1 = h + e1(e) + Ch(e,f,g) + 0x19a4c116 + W[48];
	t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2;
	t1 = g + e1(d) + Ch(d,e,f) + 0x1e376c08 + W[49];
	t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2;
	t1 = f + e1(c) + Ch(c,d,e) + 0x2748774c + W[50];
	t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2;
	t1 = e + e1(b) + Ch(b,c,d) + 0x34b0bcb5 + W[51];
	t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2;
	t1 = d + e1(a) + Ch(a,b,c) + 0x391c0cb3 + W[52];
	t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2;
	t1 = c + e1(h) + Ch(h,a,b) + 0x4ed8aa4a + W[53];
	t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2;
	t1 = b + e1(g) + Ch(g,h,a) + 0x5b9cca4f + W[54];
	t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2;
	t1 = a + e1(f) + Ch(f,g,h) + 0x682e6ff3 + W[55];
	t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2;

	t1 = h + e1(e) + Ch(e,f,g) + 0x748f82ee + W[56];
	t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2;
	t1 = g + e1(d) + Ch(d,e,f) + 0x78a5636f + W[57];
	t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2;
	t1 = f + e1(c) + Ch(c,d,e) + 0x84c87814 + W[58];
	t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2;
	t1 = e + e1(b) + Ch(b,c,d) + 0x8cc70208 + W[59];
	t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2;
	t1 = d + e1(a) + Ch(a,b,c) + 0x90befffa + W[60];
	t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2;
	t1 = c + e1(h) + Ch(h,a,b) + 0xa4506ceb + W[61];
	t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2;
	t1 = b + e1(g) + Ch(g,h,a) + 0xbef9a3f7 + W[62];
	t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2;
	t1 = a + e1(f) + Ch(f,g,h) + 0xc67178f2 + W[63];
	t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2;

	state[0] += a; state[1] += b; state[2] += c; state[3] += d;
	state[4] += e; state[5] += f; state[6] += g; state[7] += h;

	/* clear any sensitive info... */
	a = b = c = d = e = f = g = h = t1 = t2 = 0;
	memset(W, 0, 64 * sizeof(uint32_t));
	}

	void sha256_init(struct sha256_ctx *sctx)
	{
	sctx->state[0] = H0;
	sctx->state[1] = H1;
	sctx->state[2] = H2;
	sctx->state[3] = H3;
	sctx->state[4] = H4;
	sctx->state[5] = H5;
	sctx->state[6] = H6;
	sctx->state[7] = H7;
	sctx->count[0] = sctx->count[1] = 0;
	}

	void sha256_update(struct sha256_ctx sctx, const uint8_t data,
	unsigned int len)
	{
	unsigned int i, idx, part_len;

	/* Compute number of bytes mod 128 */
	idx = (unsigned int)((sctx->count[0] >> 3) & 0x3f);

	/* Update number of bits */
	if ((sctx->count[0] += (len << 3)) < (len << 3)) {
	sctx->count[1]++;
	sctx->count[1] += (len >> 29);
	}

	part_len = 64 - idx;

	/* Transform as many times as possible. */
	if (len >= part_len) {
	memcpy(&sctx->buf[idx], data, part_len);
	sha256_transform(sctx->state, sctx->buf);

	for (i = part_len; i + 63 < len; i += 64)
	sha256_transform(sctx->state, &data[i]);
	idx = 0;
	} else {
	i = 0;
	}

	/* Buffer remaining input */
	memcpy(&sctx->buf[idx], &data[i], len-i);
	}