crypto/rmd256.c - third_party/linux - Git at Google

 /*
  * Cryptographic API.
  *
  * RIPEMD-256 - RACE Integrity Primitives Evaluation Message Digest.
  *
  * Based on the reference implementation by Antoon Bosselaers, ESAT-COSIC
  *
  * Copyright (c) 2008 Adrian-Ken Rueegsegger <ken@codelabs.ch>
  *
  * 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 <asm/byteorder.h>

 #include "ripemd.h"

 struct rmd256_ctx {
 	u64 byte_count;
 	u32 state[8];
 	__le32 buffer[16];
 };

 #define K1  RMD_K1
 #define K2  RMD_K2
 #define K3  RMD_K3
 #define K4  RMD_K4
 #define KK1 RMD_K6
 #define KK2 RMD_K7
 #define KK3 RMD_K8
 #define KK4 RMD_K1

 #define F1(x, y, z) (x ^ y ^ z)		/* XOR */
 #define F2(x, y, z) (z ^ (x & (y ^ z)))	/* x ? y : z */
 #define F3(x, y, z) ((x | ~y) ^ z)
 #define F4(x, y, z) (y ^ (z & (x ^ y)))	/* z ? x : y */

 #define ROUND(a, b, c, d, f, k, x, s)  { \
 	(a) += f((b), (c), (d)) + le32_to_cpup(&(x)) + (k); \
 	(a) = rol32((a), (s)); \
 }

 static void rmd256_transform(u32 *state, const __le32 *in)
 {
 	u32 aa, bb, cc, dd, aaa, bbb, ccc, ddd, tmp;

 	/* Initialize left lane */
 	aa = state[0];
 	bb = state[1];
 	cc = state[2];
 	dd = state[3];

 	/* Initialize right lane */
 	aaa = state[4];
 	bbb = state[5];
 	ccc = state[6];
 	ddd = state[7];

 	/* round 1: left lane */
 	ROUND(aa, bb, cc, dd, F1, K1, in[0],  11);
 	ROUND(dd, aa, bb, cc, F1, K1, in[1],  14);
 	ROUND(cc, dd, aa, bb, F1, K1, in[2],  15);
 	ROUND(bb, cc, dd, aa, F1, K1, in[3],  12);
 	ROUND(aa, bb, cc, dd, F1, K1, in[4],   5);
 	ROUND(dd, aa, bb, cc, F1, K1, in[5],   8);
 	ROUND(cc, dd, aa, bb, F1, K1, in[6],   7);
 	ROUND(bb, cc, dd, aa, F1, K1, in[7],   9);
 	ROUND(aa, bb, cc, dd, F1, K1, in[8],  11);
 	ROUND(dd, aa, bb, cc, F1, K1, in[9],  13);
 	ROUND(cc, dd, aa, bb, F1, K1, in[10], 14);
 	ROUND(bb, cc, dd, aa, F1, K1, in[11], 15);
 	ROUND(aa, bb, cc, dd, F1, K1, in[12],  6);
 	ROUND(dd, aa, bb, cc, F1, K1, in[13],  7);
 	ROUND(cc, dd, aa, bb, F1, K1, in[14],  9);
 	ROUND(bb, cc, dd, aa, F1, K1, in[15],  8);

 	/* round 1: right lane */
 	ROUND(aaa, bbb, ccc, ddd, F4, KK1, in[5],   8);
 	ROUND(ddd, aaa, bbb, ccc, F4, KK1, in[14],  9);
 	ROUND(ccc, ddd, aaa, bbb, F4, KK1, in[7],   9);
 	ROUND(bbb, ccc, ddd, aaa, F4, KK1, in[0],  11);
 	ROUND(aaa, bbb, ccc, ddd, F4, KK1, in[9],  13);
 	ROUND(ddd, aaa, bbb, ccc, F4, KK1, in[2],  15);
 	ROUND(ccc, ddd, aaa, bbb, F4, KK1, in[11], 15);
 	ROUND(bbb, ccc, ddd, aaa, F4, KK1, in[4],   5);
 	ROUND(aaa, bbb, ccc, ddd, F4, KK1, in[13],  7);
 	ROUND(ddd, aaa, bbb, ccc, F4, KK1, in[6],   7);
 	ROUND(ccc, ddd, aaa, bbb, F4, KK1, in[15],  8);
 	ROUND(bbb, ccc, ddd, aaa, F4, KK1, in[8],  11);
 	ROUND(aaa, bbb, ccc, ddd, F4, KK1, in[1],  14);
 	ROUND(ddd, aaa, bbb, ccc, F4, KK1, in[10], 14);
 	ROUND(ccc, ddd, aaa, bbb, F4, KK1, in[3],  12);
 	ROUND(bbb, ccc, ddd, aaa, F4, KK1, in[12],  6);

 	/* Swap contents of "a" registers */
 	tmp = aa; aa = aaa; aaa = tmp;

 	/* round 2: left lane */
 	ROUND(aa, bb, cc, dd, F2, K2, in[7],   7);
 	ROUND(dd, aa, bb, cc, F2, K2, in[4],   6);
 	ROUND(cc, dd, aa, bb, F2, K2, in[13],  8);
 	ROUND(bb, cc, dd, aa, F2, K2, in[1],  13);
 	ROUND(aa, bb, cc, dd, F2, K2, in[10], 11);
 	ROUND(dd, aa, bb, cc, F2, K2, in[6],   9);
 	ROUND(cc, dd, aa, bb, F2, K2, in[15],  7);
 	ROUND(bb, cc, dd, aa, F2, K2, in[3],  15);
 	ROUND(aa, bb, cc, dd, F2, K2, in[12],  7);
 	ROUND(dd, aa, bb, cc, F2, K2, in[0],  12);
 	ROUND(cc, dd, aa, bb, F2, K2, in[9],  15);
 	ROUND(bb, cc, dd, aa, F2, K2, in[5],   9);
 	ROUND(aa, bb, cc, dd, F2, K2, in[2],  11);
 	ROUND(dd, aa, bb, cc, F2, K2, in[14],  7);
 	ROUND(cc, dd, aa, bb, F2, K2, in[11], 13);
 	ROUND(bb, cc, dd, aa, F2, K2, in[8],  12);

 	/* round 2: right lane */
 	ROUND(aaa, bbb, ccc, ddd, F3, KK2, in[6],   9);
 	ROUND(ddd, aaa, bbb, ccc, F3, KK2, in[11], 13);
 	ROUND(ccc, ddd, aaa, bbb, F3, KK2, in[3],  15);
 	ROUND(bbb, ccc, ddd, aaa, F3, KK2, in[7],   7);
 	ROUND(aaa, bbb, ccc, ddd, F3, KK2, in[0],  12);
 	ROUND(ddd, aaa, bbb, ccc, F3, KK2, in[13],  8);
 	ROUND(ccc, ddd, aaa, bbb, F3, KK2, in[5],   9);
 	ROUND(bbb, ccc, ddd, aaa, F3, KK2, in[10], 11);
 	ROUND(aaa, bbb, ccc, ddd, F3, KK2, in[14],  7);
 	ROUND(ddd, aaa, bbb, ccc, F3, KK2, in[15],  7);
 	ROUND(ccc, ddd, aaa, bbb, F3, KK2, in[8],  12);
 	ROUND(bbb, ccc, ddd, aaa, F3, KK2, in[12],  7);
 	ROUND(aaa, bbb, ccc, ddd, F3, KK2, in[4],   6);
 	ROUND(ddd, aaa, bbb, ccc, F3, KK2, in[9],  15);
 	ROUND(ccc, ddd, aaa, bbb, F3, KK2, in[1],  13);
 	ROUND(bbb, ccc, ddd, aaa, F3, KK2, in[2],  11);

 	/* Swap contents of "b" registers */
 	tmp = bb; bb = bbb; bbb = tmp;

 	/* round 3: left lane */
 	ROUND(aa, bb, cc, dd, F3, K3, in[3],  11);
 	ROUND(dd, aa, bb, cc, F3, K3, in[10], 13);
 	ROUND(cc, dd, aa, bb, F3, K3, in[14],  6);
 	ROUND(bb, cc, dd, aa, F3, K3, in[4],   7);
 	ROUND(aa, bb, cc, dd, F3, K3, in[9],  14);
 	ROUND(dd, aa, bb, cc, F3, K3, in[15],  9);
 	ROUND(cc, dd, aa, bb, F3, K3, in[8],  13);
 	ROUND(bb, cc, dd, aa, F3, K3, in[1],  15);
 	ROUND(aa, bb, cc, dd, F3, K3, in[2],  14);
 	ROUND(dd, aa, bb, cc, F3, K3, in[7],   8);
 	ROUND(cc, dd, aa, bb, F3, K3, in[0],  13);
 	ROUND(bb, cc, dd, aa, F3, K3, in[6],   6);
 	ROUND(aa, bb, cc, dd, F3, K3, in[13],  5);
 	ROUND(dd, aa, bb, cc, F3, K3, in[11], 12);
 	ROUND(cc, dd, aa, bb, F3, K3, in[5],   7);
 	ROUND(bb, cc, dd, aa, F3, K3, in[12],  5);

 	/* round 3: right lane */
 	ROUND(aaa, bbb, ccc, ddd, F2, KK3, in[15],  9);
 	ROUND(ddd, aaa, bbb, ccc, F2, KK3, in[5],   7);
 	ROUND(ccc, ddd, aaa, bbb, F2, KK3, in[1],  15);
 	ROUND(bbb, ccc, ddd, aaa, F2, KK3, in[3],  11);
 	ROUND(aaa, bbb, ccc, ddd, F2, KK3, in[7],   8);
 	ROUND(ddd, aaa, bbb, ccc, F2, KK3, in[14],  6);
 	ROUND(ccc, ddd, aaa, bbb, F2, KK3, in[6],   6);
 	ROUND(bbb, ccc, ddd, aaa, F2, KK3, in[9],  14);
 	ROUND(aaa, bbb, ccc, ddd, F2, KK3, in[11], 12);
 	ROUND(ddd, aaa, bbb, ccc, F2, KK3, in[8],  13);
 	ROUND(ccc, ddd, aaa, bbb, F2, KK3, in[12],  5);
 	ROUND(bbb, ccc, ddd, aaa, F2, KK3, in[2],  14);
 	ROUND(aaa, bbb, ccc, ddd, F2, KK3, in[10], 13);
 	ROUND(ddd, aaa, bbb, ccc, F2, KK3, in[0],  13);
 	ROUND(ccc, ddd, aaa, bbb, F2, KK3, in[4],   7);
 	ROUND(bbb, ccc, ddd, aaa, F2, KK3, in[13],  5);

 	/* Swap contents of "c" registers */
 	tmp = cc; cc = ccc; ccc = tmp;

 	/* round 4: left lane */
 	ROUND(aa, bb, cc, dd, F4, K4, in[1],  11);
 	ROUND(dd, aa, bb, cc, F4, K4, in[9],  12);
 	ROUND(cc, dd, aa, bb, F4, K4, in[11], 14);
 	ROUND(bb, cc, dd, aa, F4, K4, in[10], 15);
 	ROUND(aa, bb, cc, dd, F4, K4, in[0],  14);
 	ROUND(dd, aa, bb, cc, F4, K4, in[8],  15);
 	ROUND(cc, dd, aa, bb, F4, K4, in[12],  9);
 	ROUND(bb, cc, dd, aa, F4, K4, in[4],   8);
 	ROUND(aa, bb, cc, dd, F4, K4, in[13],  9);
 	ROUND(dd, aa, bb, cc, F4, K4, in[3],  14);
 	ROUND(cc, dd, aa, bb, F4, K4, in[7],   5);
 	ROUND(bb, cc, dd, aa, F4, K4, in[15],  6);
 	ROUND(aa, bb, cc, dd, F4, K4, in[14],  8);
 	ROUND(dd, aa, bb, cc, F4, K4, in[5],   6);
 	ROUND(cc, dd, aa, bb, F4, K4, in[6],   5);
 	ROUND(bb, cc, dd, aa, F4, K4, in[2],  12);

 	/* round 4: right lane */
 	ROUND(aaa, bbb, ccc, ddd, F1, KK4, in[8],  15);
 	ROUND(ddd, aaa, bbb, ccc, F1, KK4, in[6],   5);
 	ROUND(ccc, ddd, aaa, bbb, F1, KK4, in[4],   8);
 	ROUND(bbb, ccc, ddd, aaa, F1, KK4, in[1],  11);
 	ROUND(aaa, bbb, ccc, ddd, F1, KK4, in[3],  14);
 	ROUND(ddd, aaa, bbb, ccc, F1, KK4, in[11], 14);
 	ROUND(ccc, ddd, aaa, bbb, F1, KK4, in[15],  6);
 	ROUND(bbb, ccc, ddd, aaa, F1, KK4, in[0],  14);
 	ROUND(aaa, bbb, ccc, ddd, F1, KK4, in[5],   6);
 	ROUND(ddd, aaa, bbb, ccc, F1, KK4, in[12],  9);
 	ROUND(ccc, ddd, aaa, bbb, F1, KK4, in[2],  12);
 	ROUND(bbb, ccc, ddd, aaa, F1, KK4, in[13],  9);
 	ROUND(aaa, bbb, ccc, ddd, F1, KK4, in[9],  12);
 	ROUND(ddd, aaa, bbb, ccc, F1, KK4, in[7],   5);
 	ROUND(ccc, ddd, aaa, bbb, F1, KK4, in[10], 15);
 	ROUND(bbb, ccc, ddd, aaa, F1, KK4, in[14],  8);

 	/* Swap contents of "d" registers */
 	tmp = dd; dd = ddd; ddd = tmp;

 	/* combine results */
 	state[0] += aa;
 	state[1] += bb;
 	state[2] += cc;
 	state[3] += dd;
 	state[4] += aaa;
 	state[5] += bbb;
 	state[6] += ccc;
 	state[7] += ddd;

 	return;
 }

 static int rmd256_init(struct shash_desc *desc)
 {
 	struct rmd256_ctx *rctx = shash_desc_ctx(desc);

 	rctx->byte_count = 0;

 	rctx->state[0] = RMD_H0;
 	rctx->state[1] = RMD_H1;
 	rctx->state[2] = RMD_H2;
 	rctx->state[3] = RMD_H3;
 	rctx->state[4] = RMD_H5;
 	rctx->state[5] = RMD_H6;
 	rctx->state[6] = RMD_H7;
 	rctx->state[7] = RMD_H8;

 	memset(rctx->buffer, 0, sizeof(rctx->buffer));

 	return 0;
 }

 static int rmd256_update(struct shash_desc *desc, const u8 *data,
 			 unsigned int len)
 {
 	struct rmd256_ctx *rctx = shash_desc_ctx(desc);
 	const u32 avail = sizeof(rctx->buffer) - (rctx->byte_count & 0x3f);

 	rctx->byte_count += len;

 	/* Enough space in buffer? If so copy and we're done */
 	if (avail > len) {
 		memcpy((char *)rctx->buffer + (sizeof(rctx->buffer) - avail),
 		       data, len);
 		goto out;
 	}

 	memcpy((char *)rctx->buffer + (sizeof(rctx->buffer) - avail),
 	       data, avail);

 	rmd256_transform(rctx->state, rctx->buffer);
 	data += avail;
 	len -= avail;

 	while (len >= sizeof(rctx->buffer)) {
 		memcpy(rctx->buffer, data, sizeof(rctx->buffer));
 		rmd256_transform(rctx->state, rctx->buffer);
 		data += sizeof(rctx->buffer);
 		len -= sizeof(rctx->buffer);
 	}

 	memcpy(rctx->buffer, data, len);

 out:
 	return 0;
 }

 /* Add padding and return the message digest. */
 static int rmd256_final(struct shash_desc *desc, u8 *out)
 {
 	struct rmd256_ctx *rctx = shash_desc_ctx(desc);
 	u32 i, index, padlen;
 	__le64 bits;
 	__le32 *dst = (__le32 *)out;
 	static const u8 padding[64] = { 0x80, };

 	bits = cpu_to_le64(rctx->byte_count << 3);

 	/* Pad out to 56 mod 64 */
 	index = rctx->byte_count & 0x3f;
 	padlen = (index < 56) ? (56 - index) : ((64+56) - index);
 	rmd256_update(desc, padding, padlen);

 	/* Append length */
 	rmd256_update(desc, (const u8 *)&bits, sizeof(bits));

 	/* Store state in digest */
 	for (i = 0; i < 8; i++)
 		dst[i] = cpu_to_le32p(&rctx->state[i]);

 	/* Wipe context */
 	memset(rctx, 0, sizeof(*rctx));

 	return 0;
 }

 static struct shash_alg alg = {
 	.digestsize	=	RMD256_DIGEST_SIZE,
 	.init		=	rmd256_init,
 	.update		=	rmd256_update,
 	.final		=	rmd256_final,
 	.descsize	=	sizeof(struct rmd256_ctx),
 	.base		=	{
 		.cra_name	 =	"rmd256",
 		.cra_flags	 =	CRYPTO_ALG_TYPE_SHASH,
 		.cra_blocksize	 =	RMD256_BLOCK_SIZE,
 		.cra_module	 =	THIS_MODULE,
 	}
 };

 static int __init rmd256_mod_init(void)
 {
 	return crypto_register_shash(&alg);
 }

 static void __exit rmd256_mod_fini(void)
 {
 	crypto_unregister_shash(&alg);
 }

 module_init(rmd256_mod_init);
 module_exit(rmd256_mod_fini);

 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Adrian-Ken Rueegsegger <ken@codelabs.ch>");
 MODULE_DESCRIPTION("RIPEMD-256 Message Digest");
 MODULE_ALIAS_CRYPTO("rmd256");
	/*
	* Cryptographic API.
	*
	* RIPEMD-256 - RACE Integrity Primitives Evaluation Message Digest.
	*
	* Based on the reference implementation by Antoon Bosselaers, ESAT-COSIC
	*
	* Copyright (c) 2008 Adrian-Ken Rueegsegger <ken@codelabs.ch>
	*
	* 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 <asm/byteorder.h>

	#include "ripemd.h"

	struct rmd256_ctx {
	u64 byte_count;
	u32 state[8];
	__le32 buffer[16];
	};

	#define K1 RMD_K1
	#define K2 RMD_K2
	#define K3 RMD_K3
	#define K4 RMD_K4
	#define KK1 RMD_K6
	#define KK2 RMD_K7
	#define KK3 RMD_K8
	#define KK4 RMD_K1

	#define F1(x, y, z) (x ^ y ^ z) /* XOR */
	#define F2(x, y, z) (z ^ (x & (y ^ z))) /* x ? y : z */
	#define F3(x, y, z) ((x \| ~y) ^ z)
	#define F4(x, y, z) (y ^ (z & (x ^ y))) /* z ? x : y */

	#define ROUND(a, b, c, d, f, k, x, s) { \
	(a) += f((b), (c), (d)) + le32_to_cpup(&(x)) + (k); \
	(a) = rol32((a), (s)); \
	}

	static void rmd256_transform(u32 state, const __le32 in)
	{
	u32 aa, bb, cc, dd, aaa, bbb, ccc, ddd, tmp;

	/* Initialize left lane */
	aa = state[0];
	bb = state[1];
	cc = state[2];
	dd = state[3];

	/* Initialize right lane */
	aaa = state[4];
	bbb = state[5];
	ccc = state[6];
	ddd = state[7];

	/* round 1: left lane */
	ROUND(aa, bb, cc, dd, F1, K1, in[0], 11);
	ROUND(dd, aa, bb, cc, F1, K1, in[1], 14);
	ROUND(cc, dd, aa, bb, F1, K1, in[2], 15);
	ROUND(bb, cc, dd, aa, F1, K1, in[3], 12);
	ROUND(aa, bb, cc, dd, F1, K1, in[4], 5);
	ROUND(dd, aa, bb, cc, F1, K1, in[5], 8);
	ROUND(cc, dd, aa, bb, F1, K1, in[6], 7);
	ROUND(bb, cc, dd, aa, F1, K1, in[7], 9);
	ROUND(aa, bb, cc, dd, F1, K1, in[8], 11);
	ROUND(dd, aa, bb, cc, F1, K1, in[9], 13);
	ROUND(cc, dd, aa, bb, F1, K1, in[10], 14);
	ROUND(bb, cc, dd, aa, F1, K1, in[11], 15);
	ROUND(aa, bb, cc, dd, F1, K1, in[12], 6);
	ROUND(dd, aa, bb, cc, F1, K1, in[13], 7);
	ROUND(cc, dd, aa, bb, F1, K1, in[14], 9);
	ROUND(bb, cc, dd, aa, F1, K1, in[15], 8);

	/* round 1: right lane */
	ROUND(aaa, bbb, ccc, ddd, F4, KK1, in[5], 8);
	ROUND(ddd, aaa, bbb, ccc, F4, KK1, in[14], 9);
	ROUND(ccc, ddd, aaa, bbb, F4, KK1, in[7], 9);
	ROUND(bbb, ccc, ddd, aaa, F4, KK1, in[0], 11);
	ROUND(aaa, bbb, ccc, ddd, F4, KK1, in[9], 13);
	ROUND(ddd, aaa, bbb, ccc, F4, KK1, in[2], 15);
	ROUND(ccc, ddd, aaa, bbb, F4, KK1, in[11], 15);
	ROUND(bbb, ccc, ddd, aaa, F4, KK1, in[4], 5);
	ROUND(aaa, bbb, ccc, ddd, F4, KK1, in[13], 7);
	ROUND(ddd, aaa, bbb, ccc, F4, KK1, in[6], 7);
	ROUND(ccc, ddd, aaa, bbb, F4, KK1, in[15], 8);
	ROUND(bbb, ccc, ddd, aaa, F4, KK1, in[8], 11);
	ROUND(aaa, bbb, ccc, ddd, F4, KK1, in[1], 14);
	ROUND(ddd, aaa, bbb, ccc, F4, KK1, in[10], 14);
	ROUND(ccc, ddd, aaa, bbb, F4, KK1, in[3], 12);
	ROUND(bbb, ccc, ddd, aaa, F4, KK1, in[12], 6);

	/* Swap contents of "a" registers */
	tmp = aa; aa = aaa; aaa = tmp;

	/* round 2: left lane */
	ROUND(aa, bb, cc, dd, F2, K2, in[7], 7);
	ROUND(dd, aa, bb, cc, F2, K2, in[4], 6);
	ROUND(cc, dd, aa, bb, F2, K2, in[13], 8);
	ROUND(bb, cc, dd, aa, F2, K2, in[1], 13);
	ROUND(aa, bb, cc, dd, F2, K2, in[10], 11);
	ROUND(dd, aa, bb, cc, F2, K2, in[6], 9);
	ROUND(cc, dd, aa, bb, F2, K2, in[15], 7);
	ROUND(bb, cc, dd, aa, F2, K2, in[3], 15);
	ROUND(aa, bb, cc, dd, F2, K2, in[12], 7);
	ROUND(dd, aa, bb, cc, F2, K2, in[0], 12);
	ROUND(cc, dd, aa, bb, F2, K2, in[9], 15);
	ROUND(bb, cc, dd, aa, F2, K2, in[5], 9);
	ROUND(aa, bb, cc, dd, F2, K2, in[2], 11);
	ROUND(dd, aa, bb, cc, F2, K2, in[14], 7);
	ROUND(cc, dd, aa, bb, F2, K2, in[11], 13);
	ROUND(bb, cc, dd, aa, F2, K2, in[8], 12);

	/* round 2: right lane */
	ROUND(aaa, bbb, ccc, ddd, F3, KK2, in[6], 9);
	ROUND(ddd, aaa, bbb, ccc, F3, KK2, in[11], 13);
	ROUND(ccc, ddd, aaa, bbb, F3, KK2, in[3], 15);
	ROUND(bbb, ccc, ddd, aaa, F3, KK2, in[7], 7);
	ROUND(aaa, bbb, ccc, ddd, F3, KK2, in[0], 12);
	ROUND(ddd, aaa, bbb, ccc, F3, KK2, in[13], 8);
	ROUND(ccc, ddd, aaa, bbb, F3, KK2, in[5], 9);
	ROUND(bbb, ccc, ddd, aaa, F3, KK2, in[10], 11);
	ROUND(aaa, bbb, ccc, ddd, F3, KK2, in[14], 7);
	ROUND(ddd, aaa, bbb, ccc, F3, KK2, in[15], 7);
	ROUND(ccc, ddd, aaa, bbb, F3, KK2, in[8], 12);
	ROUND(bbb, ccc, ddd, aaa, F3, KK2, in[12], 7);
	ROUND(aaa, bbb, ccc, ddd, F3, KK2, in[4], 6);
	ROUND(ddd, aaa, bbb, ccc, F3, KK2, in[9], 15);
	ROUND(ccc, ddd, aaa, bbb, F3, KK2, in[1], 13);
	ROUND(bbb, ccc, ddd, aaa, F3, KK2, in[2], 11);

	/* Swap contents of "b" registers */
	tmp = bb; bb = bbb; bbb = tmp;

	/* round 3: left lane */
	ROUND(aa, bb, cc, dd, F3, K3, in[3], 11);
	ROUND(dd, aa, bb, cc, F3, K3, in[10], 13);
	ROUND(cc, dd, aa, bb, F3, K3, in[14], 6);
	ROUND(bb, cc, dd, aa, F3, K3, in[4], 7);
	ROUND(aa, bb, cc, dd, F3, K3, in[9], 14);
	ROUND(dd, aa, bb, cc, F3, K3, in[15], 9);
	ROUND(cc, dd, aa, bb, F3, K3, in[8], 13);
	ROUND(bb, cc, dd, aa, F3, K3, in[1], 15);
	ROUND(aa, bb, cc, dd, F3, K3, in[2], 14);
	ROUND(dd, aa, bb, cc, F3, K3, in[7], 8);
	ROUND(cc, dd, aa, bb, F3, K3, in[0], 13);
	ROUND(bb, cc, dd, aa, F3, K3, in[6], 6);
	ROUND(aa, bb, cc, dd, F3, K3, in[13], 5);
	ROUND(dd, aa, bb, cc, F3, K3, in[11], 12);
	ROUND(cc, dd, aa, bb, F3, K3, in[5], 7);
	ROUND(bb, cc, dd, aa, F3, K3, in[12], 5);

	/* round 3: right lane */
	ROUND(aaa, bbb, ccc, ddd, F2, KK3, in[15], 9);
	ROUND(ddd, aaa, bbb, ccc, F2, KK3, in[5], 7);
	ROUND(ccc, ddd, aaa, bbb, F2, KK3, in[1], 15);
	ROUND(bbb, ccc, ddd, aaa, F2, KK3, in[3], 11);
	ROUND(aaa, bbb, ccc, ddd, F2, KK3, in[7], 8);
	ROUND(ddd, aaa, bbb, ccc, F2, KK3, in[14], 6);
	ROUND(ccc, ddd, aaa, bbb, F2, KK3, in[6], 6);
	ROUND(bbb, ccc, ddd, aaa, F2, KK3, in[9], 14);
	ROUND(aaa, bbb, ccc, ddd, F2, KK3, in[11], 12);
	ROUND(ddd, aaa, bbb, ccc, F2, KK3, in[8], 13);
	ROUND(ccc, ddd, aaa, bbb, F2, KK3, in[12], 5);
	ROUND(bbb, ccc, ddd, aaa, F2, KK3, in[2], 14);
	ROUND(aaa, bbb, ccc, ddd, F2, KK3, in[10], 13);
	ROUND(ddd, aaa, bbb, ccc, F2, KK3, in[0], 13);
	ROUND(ccc, ddd, aaa, bbb, F2, KK3, in[4], 7);
	ROUND(bbb, ccc, ddd, aaa, F2, KK3, in[13], 5);

	/* Swap contents of "c" registers */
	tmp = cc; cc = ccc; ccc = tmp;

	/* round 4: left lane */
	ROUND(aa, bb, cc, dd, F4, K4, in[1], 11);
	ROUND(dd, aa, bb, cc, F4, K4, in[9], 12);
	ROUND(cc, dd, aa, bb, F4, K4, in[11], 14);
	ROUND(bb, cc, dd, aa, F4, K4, in[10], 15);
	ROUND(aa, bb, cc, dd, F4, K4, in[0], 14);
	ROUND(dd, aa, bb, cc, F4, K4, in[8], 15);
	ROUND(cc, dd, aa, bb, F4, K4, in[12], 9);
	ROUND(bb, cc, dd, aa, F4, K4, in[4], 8);
	ROUND(aa, bb, cc, dd, F4, K4, in[13], 9);
	ROUND(dd, aa, bb, cc, F4, K4, in[3], 14);
	ROUND(cc, dd, aa, bb, F4, K4, in[7], 5);
	ROUND(bb, cc, dd, aa, F4, K4, in[15], 6);
	ROUND(aa, bb, cc, dd, F4, K4, in[14], 8);
	ROUND(dd, aa, bb, cc, F4, K4, in[5], 6);
	ROUND(cc, dd, aa, bb, F4, K4, in[6], 5);
	ROUND(bb, cc, dd, aa, F4, K4, in[2], 12);

	/* round 4: right lane */
	ROUND(aaa, bbb, ccc, ddd, F1, KK4, in[8], 15);
	ROUND(ddd, aaa, bbb, ccc, F1, KK4, in[6], 5);
	ROUND(ccc, ddd, aaa, bbb, F1, KK4, in[4], 8);
	ROUND(bbb, ccc, ddd, aaa, F1, KK4, in[1], 11);
	ROUND(aaa, bbb, ccc, ddd, F1, KK4, in[3], 14);
	ROUND(ddd, aaa, bbb, ccc, F1, KK4, in[11], 14);
	ROUND(ccc, ddd, aaa, bbb, F1, KK4, in[15], 6);
	ROUND(bbb, ccc, ddd, aaa, F1, KK4, in[0], 14);
	ROUND(aaa, bbb, ccc, ddd, F1, KK4, in[5], 6);
	ROUND(ddd, aaa, bbb, ccc, F1, KK4, in[12], 9);
	ROUND(ccc, ddd, aaa, bbb, F1, KK4, in[2], 12);
	ROUND(bbb, ccc, ddd, aaa, F1, KK4, in[13], 9);
	ROUND(aaa, bbb, ccc, ddd, F1, KK4, in[9], 12);
	ROUND(ddd, aaa, bbb, ccc, F1, KK4, in[7], 5);
	ROUND(ccc, ddd, aaa, bbb, F1, KK4, in[10], 15);
	ROUND(bbb, ccc, ddd, aaa, F1, KK4, in[14], 8);

	/* Swap contents of "d" registers */
	tmp = dd; dd = ddd; ddd = tmp;

	/* combine results */
	state[0] += aa;
	state[1] += bb;
	state[2] += cc;
	state[3] += dd;
	state[4] += aaa;
	state[5] += bbb;
	state[6] += ccc;
	state[7] += ddd;

	return;
	}

	static int rmd256_init(struct shash_desc *desc)
	{
	struct rmd256_ctx *rctx = shash_desc_ctx(desc);

	rctx->byte_count = 0;

	rctx->state[0] = RMD_H0;
	rctx->state[1] = RMD_H1;
	rctx->state[2] = RMD_H2;
	rctx->state[3] = RMD_H3;
	rctx->state[4] = RMD_H5;
	rctx->state[5] = RMD_H6;
	rctx->state[6] = RMD_H7;
	rctx->state[7] = RMD_H8;

	memset(rctx->buffer, 0, sizeof(rctx->buffer));

	return 0;
	}

	static int rmd256_update(struct shash_desc desc, const u8 data,
	unsigned int len)
	{
	struct rmd256_ctx *rctx = shash_desc_ctx(desc);
	const u32 avail = sizeof(rctx->buffer) - (rctx->byte_count & 0x3f);

	rctx->byte_count += len;

	/* Enough space in buffer? If so copy and we're done */
	if (avail > len) {
	memcpy((char *)rctx->buffer + (sizeof(rctx->buffer) - avail),
	data, len);
	goto out;
	}

	memcpy((char *)rctx->buffer + (sizeof(rctx->buffer) - avail),
	data, avail);

	rmd256_transform(rctx->state, rctx->buffer);
	data += avail;
	len -= avail;

	while (len >= sizeof(rctx->buffer)) {
	memcpy(rctx->buffer, data, sizeof(rctx->buffer));
	rmd256_transform(rctx->state, rctx->buffer);
	data += sizeof(rctx->buffer);
	len -= sizeof(rctx->buffer);
	}

	memcpy(rctx->buffer, data, len);

	out:
	return 0;
	}

	/* Add padding and return the message digest. */
	static int rmd256_final(struct shash_desc desc, u8 out)
	{
	struct rmd256_ctx *rctx = shash_desc_ctx(desc);
	u32 i, index, padlen;
	__le64 bits;
	__le32 dst = (__le32 )out;
	static const u8 padding[64] = { 0x80, };

	bits = cpu_to_le64(rctx->byte_count << 3);

	/* Pad out to 56 mod 64 */
	index = rctx->byte_count & 0x3f;
	padlen = (index < 56) ? (56 - index) : ((64+56) - index);
	rmd256_update(desc, padding, padlen);

	/* Append length */
	rmd256_update(desc, (const u8 *)&bits, sizeof(bits));

	/* Store state in digest */
	for (i = 0; i < 8; i++)
	dst[i] = cpu_to_le32p(&rctx->state[i]);

	/* Wipe context */
	memset(rctx, 0, sizeof(*rctx));

	return 0;
	}

	static struct shash_alg alg = {
	.digestsize = RMD256_DIGEST_SIZE,
	.init = rmd256_init,
	.update = rmd256_update,
	.final = rmd256_final,
	.descsize = sizeof(struct rmd256_ctx),
	.base = {
	.cra_name = "rmd256",
	.cra_flags = CRYPTO_ALG_TYPE_SHASH,
	.cra_blocksize = RMD256_BLOCK_SIZE,
	.cra_module = THIS_MODULE,
	}
	};

	static int __init rmd256_mod_init(void)
	{
	return crypto_register_shash(&alg);
	}

	static void __exit rmd256_mod_fini(void)
	{
	crypto_unregister_shash(&alg);
	}

	module_init(rmd256_mod_init);
	module_exit(rmd256_mod_fini);

	MODULE_LICENSE("GPL");
	MODULE_AUTHOR("Adrian-Ken Rueegsegger <ken@codelabs.ch>");
	MODULE_DESCRIPTION("RIPEMD-256 Message Digest");
	MODULE_ALIAS_CRYPTO("rmd256");