[linux.git] / crypto / sha256.c

/*
 * Cryptographic API.
 *
 * SHA-256, as specified in
 * http://csrc.nist.gov/cryptval/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]>
 *
 * 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/init.h>
#include <linux/module.h>
#include <linux/mm.h>
#include <linux/crypto.h>
#include <linux/types.h>
#include <asm/scatterlist.h>
#include <asm/byteorder.h>

#define SHA256_DIGEST_SIZE	32
#define SHA256_HMAC_BLOCK_SIZE	64

struct sha256_ctx {
	u32 count[2];
	u32 state[8];
	u8 buf[128];
};

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))

#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 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));
}

static void sha256_init(struct crypto_tfm *tfm)
{
	struct sha256_ctx *sctx = crypto_tfm_ctx(tfm);
	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;
}

static void sha256_update(struct crypto_tfm *tfm, const u8 *data,
			  unsigned int len)
{
	struct sha256_ctx *sctx = crypto_tfm_ctx(tfm);
	unsigned int i, index, part_len;

	/* Compute number of bytes mod 128 */
	index = (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 - index;

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

		for (i = part_len; i + 63 < len; i += 64)
			sha256_transform(sctx->state, &data[i]);
		index = 0;
	} else {
		i = 0;
	}
	
	/* Buffer remaining input */
	memcpy(&sctx->buf[index], &data[i], len-i);
}

static void sha256_final(struct crypto_tfm *tfm, u8 *out)
{
	struct sha256_ctx *sctx = crypto_tfm_ctx(tfm);
	__be32 *dst = (__be32 *)out;
	__be32 bits[2];
	unsigned int index, pad_len;
	int i;
	static const u8 padding[64] = { 0x80, };

	/* Save number of bits */
	bits[1] = cpu_to_be32(sctx->count[0]);
	bits[0] = cpu_to_be32(sctx->count[1]);

	/* Pad out to 56 mod 64. */
	index = (sctx->count[0] >> 3) & 0x3f;
	pad_len = (index < 56) ? (56 - index) : ((64+56) - index);
	sha256_update(tfm, padding, pad_len);

	/* Append length (before padding) */
	sha256_update(tfm, (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));
}


static struct crypto_alg alg = {
	.cra_name	=	"sha256",
	.cra_driver_name=	"sha256-generic",
	.cra_flags	=	CRYPTO_ALG_TYPE_DIGEST,
	.cra_blocksize	=	SHA256_HMAC_BLOCK_SIZE,
	.cra_ctxsize	=	sizeof(struct sha256_ctx),
	.cra_module	=	THIS_MODULE,
	.cra_alignmask	=	3,
	.cra_list       =       LIST_HEAD_INIT(alg.cra_list),
	.cra_u		=	{ .digest = {
	.dia_digestsize	=	SHA256_DIGEST_SIZE,
	.dia_init   	= 	sha256_init,
	.dia_update 	=	sha256_update,
	.dia_final  	=	sha256_final } }
};

static int __init init(void)
{
	return crypto_register_alg(&alg);
}

static void __exit fini(void)
{
	crypto_unregister_alg(&alg);
}

module_init(init);
module_exit(fini);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("SHA256 Secure Hash Algorithm");

MODULE_ALIAS("sha256-generic");
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Cryptographic API.
	3	*
	4	* SHA-256, as specified in
	5	* http://csrc.nist.gov/cryptval/shs/sha256-384-512.pdf
	6	*
	7	* SHA-256 code by Jean-Luc Cooke <[email protected]>.
	8	*
	9	* Copyright (c) Jean-Luc Cooke <[email protected]>
	10	* Copyright (c) Andrew McDonald <[email protected]>
	11	* Copyright (c) 2002 James Morris <[email protected]>
	12	*
	13	* This program is free software; you can redistribute it and/or modify it
	14	* under the terms of the GNU General Public License as published by the Free
	15	* Software Foundation; either version 2 of the License, or (at your option)
	16	* any later version.
	17	*
	18	*/
	19	#include <linux/init.h>
	20	#include <linux/module.h>
	21	#include <linux/mm.h>
	22	#include <linux/crypto.h>
06ace7a9	23	#include <linux/types.h>
1da177e4 LT	24	#include <asm/scatterlist.h>
	25	#include <asm/byteorder.h>
	26
	27	#define SHA256_DIGEST_SIZE 32
	28	#define SHA256_HMAC_BLOCK_SIZE 64
	29
	30	struct sha256_ctx {
	31	u32 count[2];
	32	u32 state[8];
	33	u8 buf[128];
	34	};
	35
	36	static inline u32 Ch(u32 x, u32 y, u32 z)
	37	{
	38	return z ^ (x & (y ^ z));
	39	}
	40
	41	static inline u32 Maj(u32 x, u32 y, u32 z)
	42	{
	43	return (x & y) \| (z & (x \| y));
	44	}
	45
	46	#define e0(x) (ror32(x, 2) ^ ror32(x,13) ^ ror32(x,22))
	47	#define e1(x) (ror32(x, 6) ^ ror32(x,11) ^ ror32(x,25))
	48	#define s0(x) (ror32(x, 7) ^ ror32(x,18) ^ (x >> 3))
	49	#define s1(x) (ror32(x,17) ^ ror32(x,19) ^ (x >> 10))
	50
	51	#define H0 0x6a09e667
	52	#define H1 0xbb67ae85
	53	#define H2 0x3c6ef372
	54	#define H3 0xa54ff53a
	55	#define H4 0x510e527f
	56	#define H5 0x9b05688c
	57	#define H6 0x1f83d9ab
	58	#define H7 0x5be0cd19
	59
	60	static inline void LOAD_OP(int I, u32 W, const u8 input)
	61	{
	62	W[I] = __be32_to_cpu( ((__be32*)(input))[I] );
	63	}
	64
	65	static inline void BLEND_OP(int I, u32 *W)
	66	{
	67	W[I] = s1(W[I-2]) + W[I-7] + s0(W[I-15]) + W[I-16];
	68	}
	69
	70	static void sha256_transform(u32 state, const u8 input)
	71	{
	72	u32 a, b, c, d, e, f, g, h, t1, t2;
	73	u32 W[64];
	74	int i;
	75
	76	/* load the input */
	77	for (i = 0; i < 16; i++)
	78	LOAD_OP(i, W, input);
	79
	80	/* now blend */
	81	for (i = 16; i < 64; i++)
	82	BLEND_OP(i, W);
	83
	84	/* load the state into our registers */
	85	a=state[0]; b=state[1]; c=state[2]; d=state[3];
	86	e=state[4]; f=state[5]; g=state[6]; h=state[7];
	87
88	/* now iterate */
89	t1 = h + e1(e) + Ch(e,f,g) + 0x428a2f98 + W[ 0];
90	t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2;
91	t1 = g + e1(d) + Ch(d,e,f) + 0x71374491 + W[ 1];
92	t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2;
93	t1 = f + e1(c) + Ch(c,d,e) + 0xb5c0fbcf + W[ 2];
94	t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2;
95	t1 = e + e1(b) + Ch(b,c,d) + 0xe9b5dba5 + W[ 3];
96	t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2;
97	t1 = d + e1(a) + Ch(a,b,c) + 0x3956c25b + W[ 4];
98	t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2;
99	t1 = c + e1(h) + Ch(h,a,b) + 0x59f111f1 + W[ 5];
100	t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2;
101	t1 = b + e1(g) + Ch(g,h,a) + 0x923f82a4 + W[ 6];
102	t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2;
103	t1 = a + e1(f) + Ch(f,g,h) + 0xab1c5ed5 + W[ 7];
104	t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2;
105
106	t1 = h + e1(e) + Ch(e,f,g) + 0xd807aa98 + W[ 8];
107	t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2;
108	t1 = g + e1(d) + Ch(d,e,f) + 0x12835b01 + W[ 9];
109	t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2;
110	t1 = f + e1(c) + Ch(c,d,e) + 0x243185be + W[10];
111	t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2;
112	t1 = e + e1(b) + Ch(b,c,d) + 0x550c7dc3 + W[11];
113	t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2;
114	t1 = d + e1(a) + Ch(a,b,c) + 0x72be5d74 + W[12];
115	t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2;
116	t1 = c + e1(h) + Ch(h,a,b) + 0x80deb1fe + W[13];
117	t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2;
118	t1 = b + e1(g) + Ch(g,h,a) + 0x9bdc06a7 + W[14];
119	t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2;
120	t1 = a + e1(f) + Ch(f,g,h) + 0xc19bf174 + W[15];
121	t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2;
122
123	t1 = h + e1(e) + Ch(e,f,g) + 0xe49b69c1 + W[16];
124	t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2;
125	t1 = g + e1(d) + Ch(d,e,f) + 0xefbe4786 + W[17];
126	t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2;
127	t1 = f + e1(c) + Ch(c,d,e) + 0x0fc19dc6 + W[18];
128	t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2;
129	t1 = e + e1(b) + Ch(b,c,d) + 0x240ca1cc + W[19];
130	t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2;
131	t1 = d + e1(a) + Ch(a,b,c) + 0x2de92c6f + W[20];
132	t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2;
133	t1 = c + e1(h) + Ch(h,a,b) + 0x4a7484aa + W[21];
134	t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2;
135	t1 = b + e1(g) + Ch(g,h,a) + 0x5cb0a9dc + W[22];
136	t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2;
137	t1 = a + e1(f) + Ch(f,g,h) + 0x76f988da + W[23];
138	t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2;
139
140	t1 = h + e1(e) + Ch(e,f,g) + 0x983e5152 + W[24];
141	t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2;
142	t1 = g + e1(d) + Ch(d,e,f) + 0xa831c66d + W[25];
143	t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2;
144	t1 = f + e1(c) + Ch(c,d,e) + 0xb00327c8 + W[26];
145	t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2;
146	t1 = e + e1(b) + Ch(b,c,d) + 0xbf597fc7 + W[27];
147	t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2;
148	t1 = d + e1(a) + Ch(a,b,c) + 0xc6e00bf3 + W[28];
149	t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2;
150	t1 = c + e1(h) + Ch(h,a,b) + 0xd5a79147 + W[29];
151	t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2;
152	t1 = b + e1(g) + Ch(g,h,a) + 0x06ca6351 + W[30];
153	t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2;
154	t1 = a + e1(f) + Ch(f,g,h) + 0x14292967 + W[31];
155	t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2;
156
157	t1 = h + e1(e) + Ch(e,f,g) + 0x27b70a85 + W[32];
158	t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2;
159	t1 = g + e1(d) + Ch(d,e,f) + 0x2e1b2138 + W[33];
160	t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2;
161	t1 = f + e1(c) + Ch(c,d,e) + 0x4d2c6dfc + W[34];
162	t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2;
163	t1 = e + e1(b) + Ch(b,c,d) + 0x53380d13 + W[35];
164	t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2;
165	t1 = d + e1(a) + Ch(a,b,c) + 0x650a7354 + W[36];
166	t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2;
167	t1 = c + e1(h) + Ch(h,a,b) + 0x766a0abb + W[37];
168	t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2;
169	t1 = b + e1(g) + Ch(g,h,a) + 0x81c2c92e + W[38];
170	t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2;
171	t1 = a + e1(f) + Ch(f,g,h) + 0x92722c85 + W[39];
172	t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2;
173
174	t1 = h + e1(e) + Ch(e,f,g) + 0xa2bfe8a1 + W[40];
175	t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2;
176	t1 = g + e1(d) + Ch(d,e,f) + 0xa81a664b + W[41];
177	t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2;
178	t1 = f + e1(c) + Ch(c,d,e) + 0xc24b8b70 + W[42];
179	t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2;
180	t1 = e + e1(b) + Ch(b,c,d) + 0xc76c51a3 + W[43];
181	t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2;
182	t1 = d + e1(a) + Ch(a,b,c) + 0xd192e819 + W[44];
183	t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2;
184	t1 = c + e1(h) + Ch(h,a,b) + 0xd6990624 + W[45];
185	t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2;
186	t1 = b + e1(g) + Ch(g,h,a) + 0xf40e3585 + W[46];
187	t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2;
188	t1 = a + e1(f) + Ch(f,g,h) + 0x106aa070 + W[47];
189	t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2;
190
191	t1 = h + e1(e) + Ch(e,f,g) + 0x19a4c116 + W[48];
192	t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2;
193	t1 = g + e1(d) + Ch(d,e,f) + 0x1e376c08 + W[49];
194	t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2;
195	t1 = f + e1(c) + Ch(c,d,e) + 0x2748774c + W[50];
196	t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2;
197	t1 = e + e1(b) + Ch(b,c,d) + 0x34b0bcb5 + W[51];
198	t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2;
199	t1 = d + e1(a) + Ch(a,b,c) + 0x391c0cb3 + W[52];
200	t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2;
201	t1 = c + e1(h) + Ch(h,a,b) + 0x4ed8aa4a + W[53];
202	t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2;
203	t1 = b + e1(g) + Ch(g,h,a) + 0x5b9cca4f + W[54];
204	t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2;
205	t1 = a + e1(f) + Ch(f,g,h) + 0x682e6ff3 + W[55];
206	t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2;
207
208	t1 = h + e1(e) + Ch(e,f,g) + 0x748f82ee + W[56];
209	t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2;
210	t1 = g + e1(d) + Ch(d,e,f) + 0x78a5636f + W[57];
211	t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2;
212	t1 = f + e1(c) + Ch(c,d,e) + 0x84c87814 + W[58];
213	t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2;
214	t1 = e + e1(b) + Ch(b,c,d) + 0x8cc70208 + W[59];
215	t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2;
216	t1 = d + e1(a) + Ch(a,b,c) + 0x90befffa + W[60];
217	t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2;
218	t1 = c + e1(h) + Ch(h,a,b) + 0xa4506ceb + W[61];
219	t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2;
220	t1 = b + e1(g) + Ch(g,h,a) + 0xbef9a3f7 + W[62];
221	t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2;
222	t1 = a + e1(f) + Ch(f,g,h) + 0xc67178f2 + W[63];
223	t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2;
224
225	state[0] += a; state[1] += b; state[2] += c; state[3] += d;
226	state[4] += e; state[5] += f; state[6] += g; state[7] += h;
227
228	/* clear any sensitive info... */
229	a = b = c = d = e = f = g = h = t1 = t2 = 0;
230	memset(W, 0, 64 * sizeof(u32));
231	}
232
6c2bb98b	233	static void sha256_init(struct crypto_tfm *tfm)
1da177e4	234	{
6c2bb98b	235	struct sha256_ctx *sctx = crypto_tfm_ctx(tfm);
1da177e4 LT	236	sctx->state[0] = H0;
	237	sctx->state[1] = H1;
	238	sctx->state[2] = H2;
	239	sctx->state[3] = H3;
	240	sctx->state[4] = H4;
	241	sctx->state[5] = H5;
	242	sctx->state[6] = H6;
	243	sctx->state[7] = H7;
	244	sctx->count[0] = sctx->count[1] = 0;
1da177e4 LT	245	}
1da177e4 LT	246
6c2bb98b HX	247	static void sha256_update(struct crypto_tfm tfm, const u8 data,
6c2bb98b HX	248	unsigned int len)
1da177e4	249	{
6c2bb98b	250	struct sha256_ctx *sctx = crypto_tfm_ctx(tfm);
1da177e4 LT	251	unsigned int i, index, part_len;
	252
	253	/* Compute number of bytes mod 128 */
	254	index = (unsigned int)((sctx->count[0] >> 3) & 0x3f);
	255
	256	/* Update number of bits */
	257	if ((sctx->count[0] += (len << 3)) < (len << 3)) {
	258	sctx->count[1]++;
	259	sctx->count[1] += (len >> 29);
	260	}
	261
	262	part_len = 64 - index;
	263
	264	/* Transform as many times as possible. */
	265	if (len >= part_len) {
	266	memcpy(&sctx->buf[index], data, part_len);
	267	sha256_transform(sctx->state, sctx->buf);
	268
	269	for (i = part_len; i + 63 < len; i += 64)
	270	sha256_transform(sctx->state, &data[i]);
	271	index = 0;
	272	} else {
	273	i = 0;
	274	}
	275
	276	/* Buffer remaining input */
	277	memcpy(&sctx->buf[index], &data[i], len-i);
	278	}
	279
6c2bb98b	280	static void sha256_final(struct crypto_tfm tfm, u8 out)
1da177e4	281	{
6c2bb98b	282	struct sha256_ctx *sctx = crypto_tfm_ctx(tfm);
06ace7a9 HX	283	__be32 dst = (__be32 )out;
	284	__be32 bits[2];
	285	unsigned int index, pad_len;
	286	int i;
1da177e4 LT	287	static const u8 padding[64] = { 0x80, };
	288
	289	/* Save number of bits */
06ace7a9 HX	290	bits[1] = cpu_to_be32(sctx->count[0]);
06ace7a9 HX	291	bits[0] = cpu_to_be32(sctx->count[1]);
1da177e4 LT	292
	293	/* Pad out to 56 mod 64. */
	294	index = (sctx->count[0] >> 3) & 0x3f;
	295	pad_len = (index < 56) ? (56 - index) : ((64+56) - index);
6c2bb98b	296	sha256_update(tfm, padding, pad_len);
1da177e4 LT	297
1da177e4 LT	298	/* Append length (before padding) */
6c2bb98b	299	sha256_update(tfm, (const u8 *)bits, sizeof(bits));
1da177e4 LT	300
1da177e4 LT	301	/* Store state in digest */
06ace7a9 HX	302	for (i = 0; i < 8; i++)
06ace7a9 HX	303	dst[i] = cpu_to_be32(sctx->state[i]);
1da177e4 LT	304
	305	/* Zeroize sensitive information. */
	306	memset(sctx, 0, sizeof(*sctx));
	307	}
	308
	309
	310	static struct crypto_alg alg = {
	311	.cra_name = "sha256",
b3be9a6d	312	.cra_driver_name= "sha256-generic",
1da177e4 LT	313	.cra_flags = CRYPTO_ALG_TYPE_DIGEST,
	314	.cra_blocksize = SHA256_HMAC_BLOCK_SIZE,
	315	.cra_ctxsize = sizeof(struct sha256_ctx),
	316	.cra_module = THIS_MODULE,
e1147d8f	317	.cra_alignmask = 3,
1da177e4 LT	318	.cra_list = LIST_HEAD_INIT(alg.cra_list),
	319	.cra_u = { .digest = {
	320	.dia_digestsize = SHA256_DIGEST_SIZE,
	321	.dia_init = sha256_init,
	322	.dia_update = sha256_update,
	323	.dia_final = sha256_final } }
	324	};
	325
	326	static int __init init(void)
	327	{
	328	return crypto_register_alg(&alg);
	329	}
	330
	331	static void __exit fini(void)
	332	{
	333	crypto_unregister_alg(&alg);
	334	}
	335
	336	module_init(init);
	337	module_exit(fini);
	338
	339	MODULE_LICENSE("GPL");
	340	MODULE_DESCRIPTION("SHA256 Secure Hash Algorithm");
b3be9a6d ML	341
b3be9a6d ML	342	MODULE_ALIAS("sha256-generic");