[thirdparty/kernel/stable.git] / lib / sha256.c

/*
 * SHA-256, as specified in
 * http://csrc.nist.gov/groups/STM/cavp/documents/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>
 * Copyright (c) 2014 Red Hat Inc.
 *
 * 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 <linux/bitops.h>
#include <linux/sha256.h>
#include <linux/string.h>
#include <asm/byteorder.h>

static inline u32 Ch(u32 x, u32 y, u32 z)
{
	return z ^ (x & (y ^ z));
}

static inline u32 Maj(u32 x, u32 y, u32 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))

static inline void LOAD_OP(int I, u32 *W, const u8 *input)
{
	W[I] = __be32_to_cpu(((__be32 *)(input))[I]);
}

static inline void BLEND_OP(int I, u32 *W)
{
	W[I] = s1(W[I-2]) + W[I-7] + s0(W[I-15]) + W[I-16];
}

static void sha256_transform(u32 *state, const u8 *input)
{
	u32 a, b, c, d, e, f, g, h, t1, t2;
	u32 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(u32));
}

int sha256_init(struct sha256_state *sctx)
{
	sctx->state[0] = SHA256_H0;
	sctx->state[1] = SHA256_H1;
	sctx->state[2] = SHA256_H2;
	sctx->state[3] = SHA256_H3;
	sctx->state[4] = SHA256_H4;
	sctx->state[5] = SHA256_H5;
	sctx->state[6] = SHA256_H6;
	sctx->state[7] = SHA256_H7;
	sctx->count = 0;

	return 0;
}

int sha256_update(struct sha256_state *sctx, const u8 *data, unsigned int len)
{
	unsigned int partial, done;
	const u8 *src;

	partial = sctx->count & 0x3f;
	sctx->count += len;
	done = 0;
	src = data;

	if ((partial + len) > 63) {
		if (partial) {
			done = -partial;
			memcpy(sctx->buf + partial, data, done + 64);
			src = sctx->buf;
		}

		do {
			sha256_transform(sctx->state, src);
			done += 64;
			src = data + done;
		} while (done + 63 < len);

		partial = 0;
	}
	memcpy(sctx->buf + partial, src, len - done);

	return 0;
}

int sha256_final(struct sha256_state *sctx, u8 *out)
{
	__be32 *dst = (__be32 *)out;
	__be64 bits;
	unsigned int index, pad_len;
	int i;
	static const u8 padding[64] = { 0x80, };

	/* Save number of bits */
	bits = cpu_to_be64(sctx->count << 3);

	/* Pad out to 56 mod 64. */
	index = sctx->count & 0x3f;
	pad_len = (index < 56) ? (56 - index) : ((64+56) - index);
	sha256_update(sctx, padding, pad_len);

	/* Append length (before padding) */
	sha256_update(sctx, (const u8 *)&bits, sizeof(bits));

	/* Store state in digest */
	for (i = 0; i < 8; i++)
		dst[i] = cpu_to_be32(sctx->state[i]);

	/* Zeroize sensitive information. */
	memset(sctx, 0, sizeof(*sctx));

	return 0;
}
Commit	Line	Data
daeba064 VG	1	/*
	2	* SHA-256, as specified in
	3	* http://csrc.nist.gov/groups/STM/cavp/documents/shs/sha256-384-512.pdf
	4	*
	5	* SHA-256 code by Jean-Luc Cooke <jlcooke@certainkey.com>.
	6	*
	7	* Copyright (c) Jean-Luc Cooke <jlcooke@certainkey.com>
	8	* Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
	9	* Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
	10	* Copyright (c) 2014 Red Hat Inc.
	11	*
	12	* This program is free software; you can redistribute it and/or modify it
	13	* under the terms of the GNU General Public License as published by the Free
	14	* Software Foundation; either version 2 of the License, or (at your option)
	15	* any later version.
	16	*/
	17
	18	#include <linux/bitops.h>
df6f2801 PR	19	#include <linux/sha256.h>
df6f2801 PR	20	#include <linux/string.h>
daeba064	21	#include <asm/byteorder.h>
daeba064 VG	22
	23	static inline u32 Ch(u32 x, u32 y, u32 z)
	24	{
	25	return z ^ (x & (y ^ z));
	26	}
	27
	28	static inline u32 Maj(u32 x, u32 y, u32 z)
	29	{
	30	return (x & y) \| (z & (x \| y));
	31	}
	32
	33	#define e0(x) (ror32(x, 2) ^ ror32(x, 13) ^ ror32(x, 22))
	34	#define e1(x) (ror32(x, 6) ^ ror32(x, 11) ^ ror32(x, 25))
	35	#define s0(x) (ror32(x, 7) ^ ror32(x, 18) ^ (x >> 3))
	36	#define s1(x) (ror32(x, 17) ^ ror32(x, 19) ^ (x >> 10))
	37
	38	static inline void LOAD_OP(int I, u32 W, const u8 input)
	39	{
	40	W[I] = __be32_to_cpu(((__be32 *)(input))[I]);
	41	}
	42
	43	static inline void BLEND_OP(int I, u32 *W)
	44	{
	45	W[I] = s1(W[I-2]) + W[I-7] + s0(W[I-15]) + W[I-16];
	46	}
	47
	48	static void sha256_transform(u32 state, const u8 input)
	49	{
	50	u32 a, b, c, d, e, f, g, h, t1, t2;
	51	u32 W[64];
	52	int i;
	53
	54	/* load the input */
	55	for (i = 0; i < 16; i++)
	56	LOAD_OP(i, W, input);
	57
	58	/* now blend */
	59	for (i = 16; i < 64; i++)
	60	BLEND_OP(i, W);
	61
	62	/* load the state into our registers */
	63	a = state[0]; b = state[1]; c = state[2]; d = state[3];
	64	e = state[4]; f = state[5]; g = state[6]; h = state[7];
	65
	66	/* now iterate */
	67	t1 = h + e1(e) + Ch(e, f, g) + 0x428a2f98 + W[0];
	68	t2 = e0(a) + Maj(a, b, c); d += t1; h = t1 + t2;
	69	t1 = g + e1(d) + Ch(d, e, f) + 0x71374491 + W[1];
	70	t2 = e0(h) + Maj(h, a, b); c += t1; g = t1 + t2;
	71	t1 = f + e1(c) + Ch(c, d, e) + 0xb5c0fbcf + W[2];
	72	t2 = e0(g) + Maj(g, h, a); b += t1; f = t1 + t2;
	73	t1 = e + e1(b) + Ch(b, c, d) + 0xe9b5dba5 + W[3];
	74	t2 = e0(f) + Maj(f, g, h); a += t1; e = t1 + t2;
	75	t1 = d + e1(a) + Ch(a, b, c) + 0x3956c25b + W[4];
	76	t2 = e0(e) + Maj(e, f, g); h += t1; d = t1 + t2;
	77	t1 = c + e1(h) + Ch(h, a, b) + 0x59f111f1 + W[5];
	78	t2 = e0(d) + Maj(d, e, f); g += t1; c = t1 + t2;
	79	t1 = b + e1(g) + Ch(g, h, a) + 0x923f82a4 + W[6];
	80	t2 = e0(c) + Maj(c, d, e); f += t1; b = t1 + t2;
	81	t1 = a + e1(f) + Ch(f, g, h) + 0xab1c5ed5 + W[7];
	82	t2 = e0(b) + Maj(b, c, d); e += t1; a = t1 + t2;
	83
	84	t1 = h + e1(e) + Ch(e, f, g) + 0xd807aa98 + W[8];
	85	t2 = e0(a) + Maj(a, b, c); d += t1; h = t1 + t2;
86	t1 = g + e1(d) + Ch(d, e, f) + 0x12835b01 + W[9];
87	t2 = e0(h) + Maj(h, a, b); c += t1; g = t1 + t2;
88	t1 = f + e1(c) + Ch(c, d, e) + 0x243185be + W[10];
89	t2 = e0(g) + Maj(g, h, a); b += t1; f = t1 + t2;
90	t1 = e + e1(b) + Ch(b, c, d) + 0x550c7dc3 + W[11];
91	t2 = e0(f) + Maj(f, g, h); a += t1; e = t1 + t2;
92	t1 = d + e1(a) + Ch(a, b, c) + 0x72be5d74 + W[12];
93	t2 = e0(e) + Maj(e, f, g); h += t1; d = t1 + t2;
94	t1 = c + e1(h) + Ch(h, a, b) + 0x80deb1fe + W[13];
95	t2 = e0(d) + Maj(d, e, f); g += t1; c = t1 + t2;
96	t1 = b + e1(g) + Ch(g, h, a) + 0x9bdc06a7 + W[14];
97	t2 = e0(c) + Maj(c, d, e); f += t1; b = t1 + t2;
98	t1 = a + e1(f) + Ch(f, g, h) + 0xc19bf174 + W[15];
99	t2 = e0(b) + Maj(b, c, d); e += t1; a = t1+t2;
100
101	t1 = h + e1(e) + Ch(e, f, g) + 0xe49b69c1 + W[16];
102	t2 = e0(a) + Maj(a, b, c); d += t1; h = t1+t2;
103	t1 = g + e1(d) + Ch(d, e, f) + 0xefbe4786 + W[17];
104	t2 = e0(h) + Maj(h, a, b); c += t1; g = t1+t2;
105	t1 = f + e1(c) + Ch(c, d, e) + 0x0fc19dc6 + W[18];
106	t2 = e0(g) + Maj(g, h, a); b += t1; f = t1+t2;
107	t1 = e + e1(b) + Ch(b, c, d) + 0x240ca1cc + W[19];
108	t2 = e0(f) + Maj(f, g, h); a += t1; e = t1+t2;
109	t1 = d + e1(a) + Ch(a, b, c) + 0x2de92c6f + W[20];
110	t2 = e0(e) + Maj(e, f, g); h += t1; d = t1+t2;
111	t1 = c + e1(h) + Ch(h, a, b) + 0x4a7484aa + W[21];
112	t2 = e0(d) + Maj(d, e, f); g += t1; c = t1+t2;
113	t1 = b + e1(g) + Ch(g, h, a) + 0x5cb0a9dc + W[22];
114	t2 = e0(c) + Maj(c, d, e); f += t1; b = t1+t2;
115	t1 = a + e1(f) + Ch(f, g, h) + 0x76f988da + W[23];
116	t2 = e0(b) + Maj(b, c, d); e += t1; a = t1+t2;
117
118	t1 = h + e1(e) + Ch(e, f, g) + 0x983e5152 + W[24];
119	t2 = e0(a) + Maj(a, b, c); d += t1; h = t1+t2;
120	t1 = g + e1(d) + Ch(d, e, f) + 0xa831c66d + W[25];
121	t2 = e0(h) + Maj(h, a, b); c += t1; g = t1+t2;
122	t1 = f + e1(c) + Ch(c, d, e) + 0xb00327c8 + W[26];
123	t2 = e0(g) + Maj(g, h, a); b += t1; f = t1+t2;
124	t1 = e + e1(b) + Ch(b, c, d) + 0xbf597fc7 + W[27];
125	t2 = e0(f) + Maj(f, g, h); a += t1; e = t1+t2;
126	t1 = d + e1(a) + Ch(a, b, c) + 0xc6e00bf3 + W[28];
127	t2 = e0(e) + Maj(e, f, g); h += t1; d = t1+t2;
128	t1 = c + e1(h) + Ch(h, a, b) + 0xd5a79147 + W[29];
129	t2 = e0(d) + Maj(d, e, f); g += t1; c = t1+t2;
130	t1 = b + e1(g) + Ch(g, h, a) + 0x06ca6351 + W[30];
131	t2 = e0(c) + Maj(c, d, e); f += t1; b = t1+t2;
132	t1 = a + e1(f) + Ch(f, g, h) + 0x14292967 + W[31];
133	t2 = e0(b) + Maj(b, c, d); e += t1; a = t1+t2;
134
135	t1 = h + e1(e) + Ch(e, f, g) + 0x27b70a85 + W[32];
136	t2 = e0(a) + Maj(a, b, c); d += t1; h = t1+t2;
137	t1 = g + e1(d) + Ch(d, e, f) + 0x2e1b2138 + W[33];
138	t2 = e0(h) + Maj(h, a, b); c += t1; g = t1+t2;
139	t1 = f + e1(c) + Ch(c, d, e) + 0x4d2c6dfc + W[34];
140	t2 = e0(g) + Maj(g, h, a); b += t1; f = t1+t2;
141	t1 = e + e1(b) + Ch(b, c, d) + 0x53380d13 + W[35];
142	t2 = e0(f) + Maj(f, g, h); a += t1; e = t1+t2;
143	t1 = d + e1(a) + Ch(a, b, c) + 0x650a7354 + W[36];
144	t2 = e0(e) + Maj(e, f, g); h += t1; d = t1+t2;
145	t1 = c + e1(h) + Ch(h, a, b) + 0x766a0abb + W[37];
146	t2 = e0(d) + Maj(d, e, f); g += t1; c = t1+t2;
147	t1 = b + e1(g) + Ch(g, h, a) + 0x81c2c92e + W[38];
148	t2 = e0(c) + Maj(c, d, e); f += t1; b = t1+t2;
149	t1 = a + e1(f) + Ch(f, g, h) + 0x92722c85 + W[39];
150	t2 = e0(b) + Maj(b, c, d); e += t1; a = t1+t2;
151
152	t1 = h + e1(e) + Ch(e, f, g) + 0xa2bfe8a1 + W[40];
153	t2 = e0(a) + Maj(a, b, c); d += t1; h = t1+t2;
154	t1 = g + e1(d) + Ch(d, e, f) + 0xa81a664b + W[41];
155	t2 = e0(h) + Maj(h, a, b); c += t1; g = t1+t2;
156	t1 = f + e1(c) + Ch(c, d, e) + 0xc24b8b70 + W[42];
157	t2 = e0(g) + Maj(g, h, a); b += t1; f = t1+t2;
158	t1 = e + e1(b) + Ch(b, c, d) + 0xc76c51a3 + W[43];
159	t2 = e0(f) + Maj(f, g, h); a += t1; e = t1+t2;
160	t1 = d + e1(a) + Ch(a, b, c) + 0xd192e819 + W[44];
161	t2 = e0(e) + Maj(e, f, g); h += t1; d = t1+t2;
162	t1 = c + e1(h) + Ch(h, a, b) + 0xd6990624 + W[45];
163	t2 = e0(d) + Maj(d, e, f); g += t1; c = t1+t2;
164	t1 = b + e1(g) + Ch(g, h, a) + 0xf40e3585 + W[46];
165	t2 = e0(c) + Maj(c, d, e); f += t1; b = t1+t2;
166	t1 = a + e1(f) + Ch(f, g, h) + 0x106aa070 + W[47];
167	t2 = e0(b) + Maj(b, c, d); e += t1; a = t1+t2;
168
169	t1 = h + e1(e) + Ch(e, f, g) + 0x19a4c116 + W[48];
170	t2 = e0(a) + Maj(a, b, c); d += t1; h = t1+t2;
171	t1 = g + e1(d) + Ch(d, e, f) + 0x1e376c08 + W[49];
172	t2 = e0(h) + Maj(h, a, b); c += t1; g = t1+t2;
173	t1 = f + e1(c) + Ch(c, d, e) + 0x2748774c + W[50];
174	t2 = e0(g) + Maj(g, h, a); b += t1; f = t1+t2;
175	t1 = e + e1(b) + Ch(b, c, d) + 0x34b0bcb5 + W[51];
176	t2 = e0(f) + Maj(f, g, h); a += t1; e = t1+t2;
177	t1 = d + e1(a) + Ch(a, b, c) + 0x391c0cb3 + W[52];
178	t2 = e0(e) + Maj(e, f, g); h += t1; d = t1+t2;
179	t1 = c + e1(h) + Ch(h, a, b) + 0x4ed8aa4a + W[53];
180	t2 = e0(d) + Maj(d, e, f); g += t1; c = t1+t2;
181	t1 = b + e1(g) + Ch(g, h, a) + 0x5b9cca4f + W[54];
182	t2 = e0(c) + Maj(c, d, e); f += t1; b = t1+t2;
183	t1 = a + e1(f) + Ch(f, g, h) + 0x682e6ff3 + W[55];
184	t2 = e0(b) + Maj(b, c, d); e += t1; a = t1+t2;
185
186	t1 = h + e1(e) + Ch(e, f, g) + 0x748f82ee + W[56];
187	t2 = e0(a) + Maj(a, b, c); d += t1; h = t1+t2;
188	t1 = g + e1(d) + Ch(d, e, f) + 0x78a5636f + W[57];
189	t2 = e0(h) + Maj(h, a, b); c += t1; g = t1+t2;
190	t1 = f + e1(c) + Ch(c, d, e) + 0x84c87814 + W[58];
191	t2 = e0(g) + Maj(g, h, a); b += t1; f = t1+t2;
192	t1 = e + e1(b) + Ch(b, c, d) + 0x8cc70208 + W[59];
193	t2 = e0(f) + Maj(f, g, h); a += t1; e = t1+t2;
194	t1 = d + e1(a) + Ch(a, b, c) + 0x90befffa + W[60];
195	t2 = e0(e) + Maj(e, f, g); h += t1; d = t1+t2;
196	t1 = c + e1(h) + Ch(h, a, b) + 0xa4506ceb + W[61];
197	t2 = e0(d) + Maj(d, e, f); g += t1; c = t1+t2;
198	t1 = b + e1(g) + Ch(g, h, a) + 0xbef9a3f7 + W[62];
199	t2 = e0(c) + Maj(c, d, e); f += t1; b = t1+t2;
200	t1 = a + e1(f) + Ch(f, g, h) + 0xc67178f2 + W[63];
201	t2 = e0(b) + Maj(b, c, d); e += t1; a = t1+t2;
202
203	state[0] += a; state[1] += b; state[2] += c; state[3] += d;
204	state[4] += e; state[5] += f; state[6] += g; state[7] += h;
205
206	/* clear any sensitive info... */
207	a = b = c = d = e = f = g = h = t1 = t2 = 0;
208	memset(W, 0, 64 * sizeof(u32));
209	}
210
211	int sha256_init(struct sha256_state *sctx)
212	{
213	sctx->state[0] = SHA256_H0;
214	sctx->state[1] = SHA256_H1;
215	sctx->state[2] = SHA256_H2;
216	sctx->state[3] = SHA256_H3;
217	sctx->state[4] = SHA256_H4;
218	sctx->state[5] = SHA256_H5;
219	sctx->state[6] = SHA256_H6;
220	sctx->state[7] = SHA256_H7;
221	sctx->count = 0;
222
223	return 0;
224	}
225
226	int sha256_update(struct sha256_state sctx, const u8 data, unsigned int len)
227	{
228	unsigned int partial, done;
229	const u8 *src;
230
231	partial = sctx->count & 0x3f;
232	sctx->count += len;
233	done = 0;
234	src = data;
235
236	if ((partial + len) > 63) {
237	if (partial) {
238	done = -partial;
239	memcpy(sctx->buf + partial, data, done + 64);
240	src = sctx->buf;
241	}
242
243	do {
244	sha256_transform(sctx->state, src);
245	done += 64;
246	src = data + done;
247	} while (done + 63 < len);
248
249	partial = 0;
250	}
251	memcpy(sctx->buf + partial, src, len - done);
252
253	return 0;
254	}
255
256	int sha256_final(struct sha256_state sctx, u8 out)
257	{
258	__be32 dst = (__be32 )out;
259	__be64 bits;
260	unsigned int index, pad_len;
261	int i;
262	static const u8 padding[64] = { 0x80, };
263
264	/* Save number of bits */
265	bits = cpu_to_be64(sctx->count << 3);
266
267	/* Pad out to 56 mod 64. */
268	index = sctx->count & 0x3f;
269	pad_len = (index < 56) ? (56 - index) : ((64+56) - index);
270	sha256_update(sctx, padding, pad_len);
271
272	/* Append length (before padding) */
273	sha256_update(sctx, (const u8 *)&bits, sizeof(bits));
274
275	/* Store state in digest */
276	for (i = 0; i < 8; i++)
277	dst[i] = cpu_to_be32(sctx->state[i]);
278
279	/* Zeroize sensitive information. */
280	memset(sctx, 0, sizeof(*sctx));
281
282	return 0;
283	}