252 lines
6.2 KiB
C
252 lines
6.2 KiB
C
/*
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* Cryptographic API.
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*
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* MD4 Message Digest Algorithm (RFC1320).
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*
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* Implementation derived from Andrew Tridgell and Steve French's
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* CIFS MD4 implementation, and the cryptoapi implementation
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* originally based on the public domain implementation written
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* by Colin Plumb in 1993.
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*
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* Copyright (c) Andrew Tridgell 1997-1998.
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* Modified by Steve French (sfrench@us.ibm.com) 2002
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* Copyright (c) Cryptoapi developers.
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* Copyright (c) 2002 David S. Miller (davem@redhat.com)
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* Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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*/
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#include <linux/init.h>
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#include <linux/crypto.h>
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/types.h>
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#include <asm/byteorder.h>
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#define MD4_DIGEST_SIZE 16
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#define MD4_HMAC_BLOCK_SIZE 64
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#define MD4_BLOCK_WORDS 16
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#define MD4_HASH_WORDS 4
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struct md4_ctx {
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u32 hash[MD4_HASH_WORDS];
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u32 block[MD4_BLOCK_WORDS];
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u64 byte_count;
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};
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static inline u32 lshift(u32 x, unsigned int s)
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{
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x &= 0xFFFFFFFF;
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return ((x << s) & 0xFFFFFFFF) | (x >> (32 - s));
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}
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static inline u32 F(u32 x, u32 y, u32 z)
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{
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return (x & y) | ((~x) & z);
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}
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static inline u32 G(u32 x, u32 y, u32 z)
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{
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return (x & y) | (x & z) | (y & z);
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}
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static inline u32 H(u32 x, u32 y, u32 z)
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{
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return x ^ y ^ z;
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}
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#define ROUND1(a,b,c,d,k,s) (a = lshift(a + F(b,c,d) + k, s))
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#define ROUND2(a,b,c,d,k,s) (a = lshift(a + G(b,c,d) + k + (u32)0x5A827999,s))
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#define ROUND3(a,b,c,d,k,s) (a = lshift(a + H(b,c,d) + k + (u32)0x6ED9EBA1,s))
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/* XXX: this stuff can be optimized */
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static inline void le32_to_cpu_array(u32 *buf, unsigned int words)
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{
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while (words--) {
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__le32_to_cpus(buf);
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buf++;
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}
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}
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static inline void cpu_to_le32_array(u32 *buf, unsigned int words)
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{
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while (words--) {
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__cpu_to_le32s(buf);
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buf++;
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}
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}
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static void md4_transform(u32 *hash, u32 const *in)
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{
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u32 a, b, c, d;
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a = hash[0];
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b = hash[1];
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c = hash[2];
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d = hash[3];
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ROUND1(a, b, c, d, in[0], 3);
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ROUND1(d, a, b, c, in[1], 7);
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ROUND1(c, d, a, b, in[2], 11);
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ROUND1(b, c, d, a, in[3], 19);
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ROUND1(a, b, c, d, in[4], 3);
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ROUND1(d, a, b, c, in[5], 7);
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ROUND1(c, d, a, b, in[6], 11);
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ROUND1(b, c, d, a, in[7], 19);
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ROUND1(a, b, c, d, in[8], 3);
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ROUND1(d, a, b, c, in[9], 7);
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ROUND1(c, d, a, b, in[10], 11);
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ROUND1(b, c, d, a, in[11], 19);
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ROUND1(a, b, c, d, in[12], 3);
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ROUND1(d, a, b, c, in[13], 7);
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ROUND1(c, d, a, b, in[14], 11);
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ROUND1(b, c, d, a, in[15], 19);
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ROUND2(a, b, c, d,in[ 0], 3);
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ROUND2(d, a, b, c, in[4], 5);
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ROUND2(c, d, a, b, in[8], 9);
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ROUND2(b, c, d, a, in[12], 13);
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ROUND2(a, b, c, d, in[1], 3);
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ROUND2(d, a, b, c, in[5], 5);
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ROUND2(c, d, a, b, in[9], 9);
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ROUND2(b, c, d, a, in[13], 13);
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ROUND2(a, b, c, d, in[2], 3);
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ROUND2(d, a, b, c, in[6], 5);
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ROUND2(c, d, a, b, in[10], 9);
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ROUND2(b, c, d, a, in[14], 13);
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ROUND2(a, b, c, d, in[3], 3);
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ROUND2(d, a, b, c, in[7], 5);
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ROUND2(c, d, a, b, in[11], 9);
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ROUND2(b, c, d, a, in[15], 13);
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ROUND3(a, b, c, d,in[ 0], 3);
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ROUND3(d, a, b, c, in[8], 9);
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ROUND3(c, d, a, b, in[4], 11);
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ROUND3(b, c, d, a, in[12], 15);
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ROUND3(a, b, c, d, in[2], 3);
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ROUND3(d, a, b, c, in[10], 9);
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ROUND3(c, d, a, b, in[6], 11);
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ROUND3(b, c, d, a, in[14], 15);
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ROUND3(a, b, c, d, in[1], 3);
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ROUND3(d, a, b, c, in[9], 9);
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ROUND3(c, d, a, b, in[5], 11);
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ROUND3(b, c, d, a, in[13], 15);
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ROUND3(a, b, c, d, in[3], 3);
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ROUND3(d, a, b, c, in[11], 9);
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ROUND3(c, d, a, b, in[7], 11);
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ROUND3(b, c, d, a, in[15], 15);
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hash[0] += a;
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hash[1] += b;
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hash[2] += c;
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hash[3] += d;
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}
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static inline void md4_transform_helper(struct md4_ctx *ctx)
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{
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le32_to_cpu_array(ctx->block, sizeof(ctx->block) / sizeof(u32));
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md4_transform(ctx->hash, ctx->block);
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}
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static void md4_init(struct crypto_tfm *tfm)
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{
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struct md4_ctx *mctx = crypto_tfm_ctx(tfm);
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mctx->hash[0] = 0x67452301;
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mctx->hash[1] = 0xefcdab89;
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mctx->hash[2] = 0x98badcfe;
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mctx->hash[3] = 0x10325476;
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mctx->byte_count = 0;
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}
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static void md4_update(struct crypto_tfm *tfm, const u8 *data, unsigned int len)
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{
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struct md4_ctx *mctx = crypto_tfm_ctx(tfm);
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const u32 avail = sizeof(mctx->block) - (mctx->byte_count & 0x3f);
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mctx->byte_count += len;
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if (avail > len) {
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memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),
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data, len);
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return;
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}
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memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),
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data, avail);
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md4_transform_helper(mctx);
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data += avail;
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len -= avail;
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while (len >= sizeof(mctx->block)) {
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memcpy(mctx->block, data, sizeof(mctx->block));
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md4_transform_helper(mctx);
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data += sizeof(mctx->block);
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len -= sizeof(mctx->block);
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}
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memcpy(mctx->block, data, len);
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}
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static void md4_final(struct crypto_tfm *tfm, u8 *out)
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{
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struct md4_ctx *mctx = crypto_tfm_ctx(tfm);
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const unsigned int offset = mctx->byte_count & 0x3f;
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char *p = (char *)mctx->block + offset;
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int padding = 56 - (offset + 1);
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*p++ = 0x80;
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if (padding < 0) {
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memset(p, 0x00, padding + sizeof (u64));
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md4_transform_helper(mctx);
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p = (char *)mctx->block;
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padding = 56;
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}
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memset(p, 0, padding);
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mctx->block[14] = mctx->byte_count << 3;
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mctx->block[15] = mctx->byte_count >> 29;
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le32_to_cpu_array(mctx->block, (sizeof(mctx->block) -
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sizeof(u64)) / sizeof(u32));
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md4_transform(mctx->hash, mctx->block);
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cpu_to_le32_array(mctx->hash, sizeof(mctx->hash) / sizeof(u32));
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memcpy(out, mctx->hash, sizeof(mctx->hash));
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memset(mctx, 0, sizeof(*mctx));
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}
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static struct crypto_alg alg = {
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.cra_name = "md4",
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.cra_flags = CRYPTO_ALG_TYPE_DIGEST,
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.cra_blocksize = MD4_HMAC_BLOCK_SIZE,
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.cra_ctxsize = sizeof(struct md4_ctx),
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.cra_module = THIS_MODULE,
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.cra_list = LIST_HEAD_INIT(alg.cra_list),
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.cra_u = { .digest = {
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.dia_digestsize = MD4_DIGEST_SIZE,
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.dia_init = md4_init,
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.dia_update = md4_update,
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.dia_final = md4_final } }
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};
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static int __init md4_mod_init(void)
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{
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return crypto_register_alg(&alg);
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}
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static void __exit md4_mod_fini(void)
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{
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crypto_unregister_alg(&alg);
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}
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module_init(md4_mod_init);
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module_exit(md4_mod_fini);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("MD4 Message Digest Algorithm");
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