/*  * Cryptographic API. * * MD5 Message Digest Algorithm (RFC1321). * * Derived from cryptoapi implementation, originally based on the * public domain implementation written by Colin Plumb in 1993. * * Copyright (c) Cryptoapi developers. * Copyright (c) 2002 James Morris <jmorris@intercode.com.au> *  * 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/string.h>#include <linux/crypto.h>#include <linux/types.h>#include <asm/byteorder.h> #define MD5_DIGEST_SIZE		16#define MD5_HMAC_BLOCK_SIZE	64#define MD5_BLOCK_WORDS		16#define MD5_HASH_WORDS		4 #define F1(x, y, z)	(z ^ (x & (y ^ z)))#define F2(x, y, z)	F1(z, x, y)#define F3(x, y, z)	(x ^ y ^ z)#define F4(x, y, z)	(y ^ (x | ~z)) #define MD5STEP(f, w, x, y, z, in, s) \	(w += f(x, y, z) + in, w = (w<<s | w>>(32-s)) + x) struct md5_ctx {	u32 hash[MD5_HASH_WORDS];	u32 block[MD5_BLOCK_WORDS];	u64 byte_count;}; static void md5_transform(u32 *hash, u32 const *in){	u32 a, b, c, d; 	a = hash[0];	b = hash[1];	c = hash[2];	d = hash[3]; 	MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7);	MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12);	MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17);	MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22);	MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7);	MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12);	MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17);	MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22);	MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7);	MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12);	MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17);	MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22);	MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7);	MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12);	MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17);	MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22); 	MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5);	MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9);	MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14);	MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);	MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5);	MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9);	MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14);	MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);	MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5);	MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9);	MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14);	MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20);	MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5);	MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);	MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14);	MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20); 	MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4);	MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11);	MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16);	MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23);	MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4);	MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);	MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);	MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23);	MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4);	MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11);	MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16);	MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23);	MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4);	MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11);	MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);	MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23); 	MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6);	MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10);	MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15);	MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21);	MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6);	MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);	MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15);	MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21);	MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);	MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);	MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15);	MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21);	MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6);	MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10);	MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);	MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21); 	hash[0] += a;	hash[1] += b;	hash[2] += c;	hash[3] += d;} /* XXX: this stuff can be optimized */static inline void le32_to_cpu_array(u32 *buf, unsigned int words){	while (words--) {		__le32_to_cpus(buf);		buf++;	}} static inline void cpu_to_le32_array(u32 *buf, unsigned int words){	while (words--) {		__cpu_to_le32s(buf);		buf++;	}} static inline void md5_transform_helper(struct md5_ctx *ctx){	le32_to_cpu_array(ctx->block, sizeof(ctx->block) / sizeof(u32));	md5_transform(ctx->hash, ctx->block);} static void md5_init(void *ctx){	struct md5_ctx *mctx = ctx; 	mctx->hash[0] = 0x67452301;	mctx->hash[1] = 0xefcdab89;	mctx->hash[2] = 0x98badcfe;	mctx->hash[3] = 0x10325476;	mctx->byte_count = 0;} static void md5_update(void *ctx, const u8 *data, unsigned int len){	struct md5_ctx *mctx = ctx;	const u32 avail = sizeof(mctx->block) - (mctx->byte_count & 0x3f); 	mctx->byte_count += len; 	if (avail > len) {		memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),		       data, len);		return;	} 	memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),	       data, avail); 	md5_transform_helper(mctx);	data += avail;	len -= avail; 	while (len >= sizeof(mctx->block)) {		memcpy(mctx->block, data, sizeof(mctx->block));		md5_transform_helper(mctx);		data += sizeof(mctx->block);		len -= sizeof(mctx->block);	} 	memcpy(mctx->block, data, len);} static void md5_final(void *ctx, u8 *out){	struct md5_ctx *mctx = ctx;	const unsigned int offset = mctx->byte_count & 0x3f;	char *p = (char *)mctx->block + offset;	int padding = 56 - (offset + 1); 	*p++ = 0x80;	if (padding < 0) {		memset(p, 0x00, padding + sizeof (u64));		md5_transform_helper(mctx);		p = (char *)mctx->block;		padding = 56;	} 	memset(p, 0, padding);	mctx->block[14] = mctx->byte_count << 3;	mctx->block[15] = mctx->byte_count >> 29;	le32_to_cpu_array(mctx->block, (sizeof(mctx->block) -	                  sizeof(u64)) / sizeof(u32));	md5_transform(mctx->hash, mctx->block);	cpu_to_le32_array(mctx->hash, sizeof(mctx->hash) / sizeof(u32));	memcpy(out, mctx->hash, sizeof(mctx->hash));	memset(mctx, 0, sizeof(*mctx));} static struct crypto_alg alg = {	.cra_name	=	"md5",	.cra_flags	=	CRYPTO_ALG_TYPE_DIGEST,	.cra_blocksize	=	MD5_HMAC_BLOCK_SIZE,	.cra_ctxsize	=	sizeof(struct md5_ctx),	.cra_module	=	THIS_MODULE,	.cra_list	=	LIST_HEAD_INIT(alg.cra_list),	.cra_u		=	{ .digest = {	.dia_digestsize	=	MD5_DIGEST_SIZE,	.dia_init   	= 	md5_init,	.dia_update 	=	md5_update,	.dia_final  	=	md5_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("MD5 Message Digest Algorithm");