crypto/sha256_generic.c - linux/kernel/git/klassert/ipsec - Git at Google

 /*
  * Cryptographic API.
  *
  * 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>
  * SHA224 Support Copyright 2007 Intel Corporation <jonathan.lynch@intel.com>
  *
  * 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 <crypto/internal/hash.h>
 #include <linux/init.h>
 #include <linux/module.h>
 #include <linux/mm.h>
 #include <linux/types.h>
 #include <crypto/sha.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));
 }


 static int sha224_init(struct shash_desc *desc)
 {
 	struct sha256_state *sctx = shash_desc_ctx(desc);
 	sctx->state[0] = SHA224_H0;
 	sctx->state[1] = SHA224_H1;
 	sctx->state[2] = SHA224_H2;
 	sctx->state[3] = SHA224_H3;
 	sctx->state[4] = SHA224_H4;
 	sctx->state[5] = SHA224_H5;
 	sctx->state[6] = SHA224_H6;
 	sctx->state[7] = SHA224_H7;
 	sctx->count = 0;

 	return 0;
 }

 static int sha256_init(struct shash_desc *desc)
 {
 	struct sha256_state *sctx = shash_desc_ctx(desc);
 	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;
 }

 static int sha256_update(struct shash_desc *desc, const u8 *data,
 			  unsigned int len)
 {
 	struct sha256_state *sctx = shash_desc_ctx(desc);
 	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;
 }

 static int sha256_final(struct shash_desc *desc, u8 *out)
 {
 	struct sha256_state *sctx = shash_desc_ctx(desc);
 	__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(desc, padding, pad_len);

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

 static int sha224_final(struct shash_desc *desc, u8 *hash)
 {
 	u8 D[SHA256_DIGEST_SIZE];

 	sha256_final(desc, D);

 	memcpy(hash, D, SHA224_DIGEST_SIZE);
 	memset(D, 0, SHA256_DIGEST_SIZE);

 	return 0;
 }

 static int sha256_export(struct shash_desc *desc, void *out)
 {
 	struct sha256_state *sctx = shash_desc_ctx(desc);

 	memcpy(out, sctx, sizeof(*sctx));
 	return 0;
 }

 static int sha256_import(struct shash_desc *desc, const void *in)
 {
 	struct sha256_state *sctx = shash_desc_ctx(desc);

 	memcpy(sctx, in, sizeof(*sctx));
 	return 0;
 }

 static struct shash_alg sha256 = {
 	.digestsize	=	SHA256_DIGEST_SIZE,
 	.init		=	sha256_init,
 	.update		=	sha256_update,
 	.final		=	sha256_final,
 	.export		=	sha256_export,
 	.import		=	sha256_import,
 	.descsize	=	sizeof(struct sha256_state),
 	.statesize	=	sizeof(struct sha256_state),
 	.base		=	{
 		.cra_name	=	"sha256",
 		.cra_driver_name=	"sha256-generic",
 		.cra_flags	=	CRYPTO_ALG_TYPE_SHASH,
 		.cra_blocksize	=	SHA256_BLOCK_SIZE,
 		.cra_module	=	THIS_MODULE,
 	}
 };

 static struct shash_alg sha224 = {
 	.digestsize	=	SHA224_DIGEST_SIZE,
 	.init		=	sha224_init,
 	.update		=	sha256_update,
 	.final		=	sha224_final,
 	.descsize	=	sizeof(struct sha256_state),
 	.base		=	{
 		.cra_name	=	"sha224",
 		.cra_driver_name=	"sha224-generic",
 		.cra_flags	=	CRYPTO_ALG_TYPE_SHASH,
 		.cra_blocksize	=	SHA224_BLOCK_SIZE,
 		.cra_module	=	THIS_MODULE,
 	}
 };

 static int __init sha256_generic_mod_init(void)
 {
 	int ret = 0;

 	ret = crypto_register_shash(&sha224);

 	if (ret < 0)
 		return ret;

 	ret = crypto_register_shash(&sha256);

 	if (ret < 0)
 		crypto_unregister_shash(&sha224);

 	return ret;
 }

 static void __exit sha256_generic_mod_fini(void)
 {
 	crypto_unregister_shash(&sha224);
 	crypto_unregister_shash(&sha256);
 }

 module_init(sha256_generic_mod_init);
 module_exit(sha256_generic_mod_fini);

 MODULE_LICENSE("GPL");
 MODULE_DESCRIPTION("SHA-224 and SHA-256 Secure Hash Algorithm");

 MODULE_ALIAS("sha224");
 MODULE_ALIAS("sha256");
	/*
	* Cryptographic API.
	*
	* 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>
	* SHA224 Support Copyright 2007 Intel Corporation <jonathan.lynch@intel.com>
	*
	* 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 <crypto/internal/hash.h>
	#include <linux/init.h>
	#include <linux/module.h>
	#include <linux/mm.h>
	#include <linux/types.h>
	#include <crypto/sha.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));
	}


	static int sha224_init(struct shash_desc *desc)
	{
	struct sha256_state *sctx = shash_desc_ctx(desc);
	sctx->state[0] = SHA224_H0;
	sctx->state[1] = SHA224_H1;
	sctx->state[2] = SHA224_H2;
	sctx->state[3] = SHA224_H3;
	sctx->state[4] = SHA224_H4;
	sctx->state[5] = SHA224_H5;
	sctx->state[6] = SHA224_H6;
	sctx->state[7] = SHA224_H7;
	sctx->count = 0;

	return 0;
	}

	static int sha256_init(struct shash_desc *desc)
	{
	struct sha256_state *sctx = shash_desc_ctx(desc);
	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;
	}

	static int sha256_update(struct shash_desc desc, const u8 data,
	unsigned int len)
	{
	struct sha256_state *sctx = shash_desc_ctx(desc);
	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;
	}

	static int sha256_final(struct shash_desc desc, u8 out)
	{
	struct sha256_state *sctx = shash_desc_ctx(desc);
	__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(desc, padding, pad_len);

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

	static int sha224_final(struct shash_desc desc, u8 hash)
	{
	u8 D[SHA256_DIGEST_SIZE];

	sha256_final(desc, D);

	memcpy(hash, D, SHA224_DIGEST_SIZE);
	memset(D, 0, SHA256_DIGEST_SIZE);

	return 0;
	}

	static int sha256_export(struct shash_desc desc, void out)
	{
	struct sha256_state *sctx = shash_desc_ctx(desc);

	memcpy(out, sctx, sizeof(*sctx));
	return 0;
	}

	static int sha256_import(struct shash_desc desc, const void in)
	{
	struct sha256_state *sctx = shash_desc_ctx(desc);

	memcpy(sctx, in, sizeof(*sctx));
	return 0;
	}

	static struct shash_alg sha256 = {
	.digestsize = SHA256_DIGEST_SIZE,
	.init = sha256_init,
	.update = sha256_update,
	.final = sha256_final,
	.export = sha256_export,
	.import = sha256_import,
	.descsize = sizeof(struct sha256_state),
	.statesize = sizeof(struct sha256_state),
	.base = {
	.cra_name = "sha256",
	.cra_driver_name= "sha256-generic",
	.cra_flags = CRYPTO_ALG_TYPE_SHASH,
	.cra_blocksize = SHA256_BLOCK_SIZE,
	.cra_module = THIS_MODULE,
	}
	};

	static struct shash_alg sha224 = {
	.digestsize = SHA224_DIGEST_SIZE,
	.init = sha224_init,
	.update = sha256_update,
	.final = sha224_final,
	.descsize = sizeof(struct sha256_state),
	.base = {
	.cra_name = "sha224",
	.cra_driver_name= "sha224-generic",
	.cra_flags = CRYPTO_ALG_TYPE_SHASH,
	.cra_blocksize = SHA224_BLOCK_SIZE,
	.cra_module = THIS_MODULE,
	}
	};

	static int __init sha256_generic_mod_init(void)
	{
	int ret = 0;

	ret = crypto_register_shash(&sha224);

	if (ret < 0)
	return ret;

	ret = crypto_register_shash(&sha256);

	if (ret < 0)
	crypto_unregister_shash(&sha224);

	return ret;
	}

	static void __exit sha256_generic_mod_fini(void)
	{
	crypto_unregister_shash(&sha224);
	crypto_unregister_shash(&sha256);
	}

	module_init(sha256_generic_mod_init);
	module_exit(sha256_generic_mod_fini);

	MODULE_LICENSE("GPL");
	MODULE_DESCRIPTION("SHA-224 and SHA-256 Secure Hash Algorithm");

	MODULE_ALIAS("sha224");
	MODULE_ALIAS("sha256");