[linux.git] / lib / sha256.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * 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 <[email protected]>.
 *
 * Copyright (c) Jean-Luc Cooke <[email protected]>
 * Copyright (c) Andrew McDonald <[email protected]>
 * Copyright (c) 2002 James Morris <[email protected]>
 * Copyright (c) 2014 Red Hat Inc.
 */

#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
2874c5fd	1	// SPDX-License-Identifier: GPL-2.0-or-later
daeba064 VG	2	/*
	3	* SHA-256, as specified in
	4	* http://csrc.nist.gov/groups/STM/cavp/documents/shs/sha256-384-512.pdf
	5	*
	6	* SHA-256 code by Jean-Luc Cooke <[email protected]>.
	7	*
	8	* Copyright (c) Jean-Luc Cooke <[email protected]>
	9	* Copyright (c) Andrew McDonald <[email protected]>
	10	* Copyright (c) 2002 James Morris <[email protected]>
	11	* Copyright (c) 2014 Red Hat Inc.
daeba064 VG	12	*/
	13
	14	#include <linux/bitops.h>
df6f2801 PR	15	#include <linux/sha256.h>
df6f2801 PR	16	#include <linux/string.h>
daeba064	17	#include <asm/byteorder.h>
daeba064 VG	18
	19	static inline u32 Ch(u32 x, u32 y, u32 z)
	20	{
	21	return z ^ (x & (y ^ z));
	22	}
	23
	24	static inline u32 Maj(u32 x, u32 y, u32 z)
	25	{
	26	return (x & y) \| (z & (x \| y));
	27	}
	28
	29	#define e0(x) (ror32(x, 2) ^ ror32(x, 13) ^ ror32(x, 22))
	30	#define e1(x) (ror32(x, 6) ^ ror32(x, 11) ^ ror32(x, 25))
	31	#define s0(x) (ror32(x, 7) ^ ror32(x, 18) ^ (x >> 3))
	32	#define s1(x) (ror32(x, 17) ^ ror32(x, 19) ^ (x >> 10))
	33
	34	static inline void LOAD_OP(int I, u32 W, const u8 input)
	35	{
	36	W[I] = __be32_to_cpu(((__be32 *)(input))[I]);
	37	}
	38
	39	static inline void BLEND_OP(int I, u32 *W)
	40	{
	41	W[I] = s1(W[I-2]) + W[I-7] + s0(W[I-15]) + W[I-16];
	42	}
	43
	44	static void sha256_transform(u32 state, const u8 input)
	45	{
	46	u32 a, b, c, d, e, f, g, h, t1, t2;
	47	u32 W[64];
	48	int i;
	49
	50	/* load the input */
	51	for (i = 0; i < 16; i++)
	52	LOAD_OP(i, W, input);
	53
	54	/* now blend */
	55	for (i = 16; i < 64; i++)
	56	BLEND_OP(i, W);
	57
	58	/* load the state into our registers */
	59	a = state[0]; b = state[1]; c = state[2]; d = state[3];
	60	e = state[4]; f = state[5]; g = state[6]; h = state[7];
	61
	62	/* now iterate */
	63	t1 = h + e1(e) + Ch(e, f, g) + 0x428a2f98 + W[0];
	64	t2 = e0(a) + Maj(a, b, c); d += t1; h = t1 + t2;
	65	t1 = g + e1(d) + Ch(d, e, f) + 0x71374491 + W[1];
	66	t2 = e0(h) + Maj(h, a, b); c += t1; g = t1 + t2;
	67	t1 = f + e1(c) + Ch(c, d, e) + 0xb5c0fbcf + W[2];
	68	t2 = e0(g) + Maj(g, h, a); b += t1; f = t1 + t2;
	69	t1 = e + e1(b) + Ch(b, c, d) + 0xe9b5dba5 + W[3];
	70	t2 = e0(f) + Maj(f, g, h); a += t1; e = t1 + t2;
	71	t1 = d + e1(a) + Ch(a, b, c) + 0x3956c25b + W[4];
	72	t2 = e0(e) + Maj(e, f, g); h += t1; d = t1 + t2;
	73	t1 = c + e1(h) + Ch(h, a, b) + 0x59f111f1 + W[5];
	74	t2 = e0(d) + Maj(d, e, f); g += t1; c = t1 + t2;
	75	t1 = b + e1(g) + Ch(g, h, a) + 0x923f82a4 + W[6];
	76	t2 = e0(c) + Maj(c, d, e); f += t1; b = t1 + t2;
	77	t1 = a + e1(f) + Ch(f, g, h) + 0xab1c5ed5 + W[7];
	78	t2 = e0(b) + Maj(b, c, d); e += t1; a = t1 + t2;
	79
	80	t1 = h + e1(e) + Ch(e, f, g) + 0xd807aa98 + W[8];
	81	t2 = e0(a) + Maj(a, b, c); d += t1; h = t1 + t2;
82	t1 = g + e1(d) + Ch(d, e, f) + 0x12835b01 + W[9];
83	t2 = e0(h) + Maj(h, a, b); c += t1; g = t1 + t2;
84	t1 = f + e1(c) + Ch(c, d, e) + 0x243185be + W[10];
85	t2 = e0(g) + Maj(g, h, a); b += t1; f = t1 + t2;
86	t1 = e + e1(b) + Ch(b, c, d) + 0x550c7dc3 + W[11];
87	t2 = e0(f) + Maj(f, g, h); a += t1; e = t1 + t2;
88	t1 = d + e1(a) + Ch(a, b, c) + 0x72be5d74 + W[12];
89	t2 = e0(e) + Maj(e, f, g); h += t1; d = t1 + t2;
90	t1 = c + e1(h) + Ch(h, a, b) + 0x80deb1fe + W[13];
91	t2 = e0(d) + Maj(d, e, f); g += t1; c = t1 + t2;
92	t1 = b + e1(g) + Ch(g, h, a) + 0x9bdc06a7 + W[14];
93	t2 = e0(c) + Maj(c, d, e); f += t1; b = t1 + t2;
94	t1 = a + e1(f) + Ch(f, g, h) + 0xc19bf174 + W[15];
95	t2 = e0(b) + Maj(b, c, d); e += t1; a = t1+t2;
96
97	t1 = h + e1(e) + Ch(e, f, g) + 0xe49b69c1 + W[16];
98	t2 = e0(a) + Maj(a, b, c); d += t1; h = t1+t2;
99	t1 = g + e1(d) + Ch(d, e, f) + 0xefbe4786 + W[17];
100	t2 = e0(h) + Maj(h, a, b); c += t1; g = t1+t2;
101	t1 = f + e1(c) + Ch(c, d, e) + 0x0fc19dc6 + W[18];
102	t2 = e0(g) + Maj(g, h, a); b += t1; f = t1+t2;
103	t1 = e + e1(b) + Ch(b, c, d) + 0x240ca1cc + W[19];
104	t2 = e0(f) + Maj(f, g, h); a += t1; e = t1+t2;
105	t1 = d + e1(a) + Ch(a, b, c) + 0x2de92c6f + W[20];
106	t2 = e0(e) + Maj(e, f, g); h += t1; d = t1+t2;
107	t1 = c + e1(h) + Ch(h, a, b) + 0x4a7484aa + W[21];
108	t2 = e0(d) + Maj(d, e, f); g += t1; c = t1+t2;
109	t1 = b + e1(g) + Ch(g, h, a) + 0x5cb0a9dc + W[22];
110	t2 = e0(c) + Maj(c, d, e); f += t1; b = t1+t2;
111	t1 = a + e1(f) + Ch(f, g, h) + 0x76f988da + W[23];
112	t2 = e0(b) + Maj(b, c, d); e += t1; a = t1+t2;
113
114	t1 = h + e1(e) + Ch(e, f, g) + 0x983e5152 + W[24];
115	t2 = e0(a) + Maj(a, b, c); d += t1; h = t1+t2;
116	t1 = g + e1(d) + Ch(d, e, f) + 0xa831c66d + W[25];
117	t2 = e0(h) + Maj(h, a, b); c += t1; g = t1+t2;
118	t1 = f + e1(c) + Ch(c, d, e) + 0xb00327c8 + W[26];
119	t2 = e0(g) + Maj(g, h, a); b += t1; f = t1+t2;
120	t1 = e + e1(b) + Ch(b, c, d) + 0xbf597fc7 + W[27];
121	t2 = e0(f) + Maj(f, g, h); a += t1; e = t1+t2;
122	t1 = d + e1(a) + Ch(a, b, c) + 0xc6e00bf3 + W[28];
123	t2 = e0(e) + Maj(e, f, g); h += t1; d = t1+t2;
124	t1 = c + e1(h) + Ch(h, a, b) + 0xd5a79147 + W[29];
125	t2 = e0(d) + Maj(d, e, f); g += t1; c = t1+t2;
126	t1 = b + e1(g) + Ch(g, h, a) + 0x06ca6351 + W[30];
127	t2 = e0(c) + Maj(c, d, e); f += t1; b = t1+t2;
128	t1 = a + e1(f) + Ch(f, g, h) + 0x14292967 + W[31];
129	t2 = e0(b) + Maj(b, c, d); e += t1; a = t1+t2;
130
131	t1 = h + e1(e) + Ch(e, f, g) + 0x27b70a85 + W[32];
132	t2 = e0(a) + Maj(a, b, c); d += t1; h = t1+t2;
133	t1 = g + e1(d) + Ch(d, e, f) + 0x2e1b2138 + W[33];
134	t2 = e0(h) + Maj(h, a, b); c += t1; g = t1+t2;
135	t1 = f + e1(c) + Ch(c, d, e) + 0x4d2c6dfc + W[34];
136	t2 = e0(g) + Maj(g, h, a); b += t1; f = t1+t2;
137	t1 = e + e1(b) + Ch(b, c, d) + 0x53380d13 + W[35];
138	t2 = e0(f) + Maj(f, g, h); a += t1; e = t1+t2;
139	t1 = d + e1(a) + Ch(a, b, c) + 0x650a7354 + W[36];
140	t2 = e0(e) + Maj(e, f, g); h += t1; d = t1+t2;
141	t1 = c + e1(h) + Ch(h, a, b) + 0x766a0abb + W[37];
142	t2 = e0(d) + Maj(d, e, f); g += t1; c = t1+t2;
143	t1 = b + e1(g) + Ch(g, h, a) + 0x81c2c92e + W[38];
144	t2 = e0(c) + Maj(c, d, e); f += t1; b = t1+t2;
145	t1 = a + e1(f) + Ch(f, g, h) + 0x92722c85 + W[39];
146	t2 = e0(b) + Maj(b, c, d); e += t1; a = t1+t2;
147
148	t1 = h + e1(e) + Ch(e, f, g) + 0xa2bfe8a1 + W[40];
149	t2 = e0(a) + Maj(a, b, c); d += t1; h = t1+t2;
150	t1 = g + e1(d) + Ch(d, e, f) + 0xa81a664b + W[41];
151	t2 = e0(h) + Maj(h, a, b); c += t1; g = t1+t2;
152	t1 = f + e1(c) + Ch(c, d, e) + 0xc24b8b70 + W[42];
153	t2 = e0(g) + Maj(g, h, a); b += t1; f = t1+t2;
154	t1 = e + e1(b) + Ch(b, c, d) + 0xc76c51a3 + W[43];
155	t2 = e0(f) + Maj(f, g, h); a += t1; e = t1+t2;
156	t1 = d + e1(a) + Ch(a, b, c) + 0xd192e819 + W[44];
157	t2 = e0(e) + Maj(e, f, g); h += t1; d = t1+t2;
158	t1 = c + e1(h) + Ch(h, a, b) + 0xd6990624 + W[45];
159	t2 = e0(d) + Maj(d, e, f); g += t1; c = t1+t2;
160	t1 = b + e1(g) + Ch(g, h, a) + 0xf40e3585 + W[46];
161	t2 = e0(c) + Maj(c, d, e); f += t1; b = t1+t2;
162	t1 = a + e1(f) + Ch(f, g, h) + 0x106aa070 + W[47];
163	t2 = e0(b) + Maj(b, c, d); e += t1; a = t1+t2;
164
165	t1 = h + e1(e) + Ch(e, f, g) + 0x19a4c116 + W[48];
166	t2 = e0(a) + Maj(a, b, c); d += t1; h = t1+t2;
167	t1 = g + e1(d) + Ch(d, e, f) + 0x1e376c08 + W[49];
168	t2 = e0(h) + Maj(h, a, b); c += t1; g = t1+t2;
169	t1 = f + e1(c) + Ch(c, d, e) + 0x2748774c + W[50];
170	t2 = e0(g) + Maj(g, h, a); b += t1; f = t1+t2;
171	t1 = e + e1(b) + Ch(b, c, d) + 0x34b0bcb5 + W[51];
172	t2 = e0(f) + Maj(f, g, h); a += t1; e = t1+t2;
173	t1 = d + e1(a) + Ch(a, b, c) + 0x391c0cb3 + W[52];
174	t2 = e0(e) + Maj(e, f, g); h += t1; d = t1+t2;
175	t1 = c + e1(h) + Ch(h, a, b) + 0x4ed8aa4a + W[53];
176	t2 = e0(d) + Maj(d, e, f); g += t1; c = t1+t2;
177	t1 = b + e1(g) + Ch(g, h, a) + 0x5b9cca4f + W[54];
178	t2 = e0(c) + Maj(c, d, e); f += t1; b = t1+t2;
179	t1 = a + e1(f) + Ch(f, g, h) + 0x682e6ff3 + W[55];
180	t2 = e0(b) + Maj(b, c, d); e += t1; a = t1+t2;
181
182	t1 = h + e1(e) + Ch(e, f, g) + 0x748f82ee + W[56];
183	t2 = e0(a) + Maj(a, b, c); d += t1; h = t1+t2;
184	t1 = g + e1(d) + Ch(d, e, f) + 0x78a5636f + W[57];
185	t2 = e0(h) + Maj(h, a, b); c += t1; g = t1+t2;
186	t1 = f + e1(c) + Ch(c, d, e) + 0x84c87814 + W[58];
187	t2 = e0(g) + Maj(g, h, a); b += t1; f = t1+t2;
188	t1 = e + e1(b) + Ch(b, c, d) + 0x8cc70208 + W[59];
189	t2 = e0(f) + Maj(f, g, h); a += t1; e = t1+t2;
190	t1 = d + e1(a) + Ch(a, b, c) + 0x90befffa + W[60];
191	t2 = e0(e) + Maj(e, f, g); h += t1; d = t1+t2;
192	t1 = c + e1(h) + Ch(h, a, b) + 0xa4506ceb + W[61];
193	t2 = e0(d) + Maj(d, e, f); g += t1; c = t1+t2;
194	t1 = b + e1(g) + Ch(g, h, a) + 0xbef9a3f7 + W[62];
195	t2 = e0(c) + Maj(c, d, e); f += t1; b = t1+t2;
196	t1 = a + e1(f) + Ch(f, g, h) + 0xc67178f2 + W[63];
197	t2 = e0(b) + Maj(b, c, d); e += t1; a = t1+t2;
198
199	state[0] += a; state[1] += b; state[2] += c; state[3] += d;
200	state[4] += e; state[5] += f; state[6] += g; state[7] += h;
201
202	/* clear any sensitive info... */
203	a = b = c = d = e = f = g = h = t1 = t2 = 0;
204	memset(W, 0, 64 * sizeof(u32));
205	}
206
207	int sha256_init(struct sha256_state *sctx)
208	{
209	sctx->state[0] = SHA256_H0;
210	sctx->state[1] = SHA256_H1;
211	sctx->state[2] = SHA256_H2;
212	sctx->state[3] = SHA256_H3;
213	sctx->state[4] = SHA256_H4;
214	sctx->state[5] = SHA256_H5;
215	sctx->state[6] = SHA256_H6;
216	sctx->state[7] = SHA256_H7;
217	sctx->count = 0;
218
219	return 0;
220	}
221
222	int sha256_update(struct sha256_state sctx, const u8 data, unsigned int len)
223	{
224	unsigned int partial, done;
225	const u8 *src;
226
227	partial = sctx->count & 0x3f;
228	sctx->count += len;
229	done = 0;
230	src = data;
231
232	if ((partial + len) > 63) {
233	if (partial) {
234	done = -partial;
235	memcpy(sctx->buf + partial, data, done + 64);
236	src = sctx->buf;
237	}
238
239	do {
240	sha256_transform(sctx->state, src);
241	done += 64;
242	src = data + done;
243	} while (done + 63 < len);
244
245	partial = 0;
246	}
247	memcpy(sctx->buf + partial, src, len - done);
248
249	return 0;
250	}
251
252	int sha256_final(struct sha256_state sctx, u8 out)
253	{
254	__be32 dst = (__be32 )out;
255	__be64 bits;
256	unsigned int index, pad_len;
257	int i;
258	static const u8 padding[64] = { 0x80, };
259
260	/* Save number of bits */
261	bits = cpu_to_be64(sctx->count << 3);
262
263	/* Pad out to 56 mod 64. */
264	index = sctx->count & 0x3f;
265	pad_len = (index < 56) ? (56 - index) : ((64+56) - index);
266	sha256_update(sctx, padding, pad_len);
267
268	/* Append length (before padding) */
269	sha256_update(sctx, (const u8 *)&bits, sizeof(bits));
270
271	/* Store state in digest */
272	for (i = 0; i < 8; i++)
273	dst[i] = cpu_to_be32(sctx->state[i]);
274
275	/* Zeroize sensitive information. */
276	memset(sctx, 0, sizeof(*sctx));
277
278	return 0;
279	}