462 lines
14 KiB
C
462 lines
14 KiB
C
/* This file is not used by busybox right now.
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* However, the code here seems to be a tiny bit smaller
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* than one in md5.c. Need to investigate which one
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* is better overall...
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* Hint: grep for md5prime to find places where you can switch
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* md5.c/md5prime.c
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*/
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/*
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* MD5C.C - RSA Data Security, Inc., MD5 message-digest algorithm
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*
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* Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All
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* rights reserved.
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*
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* License to copy and use this software is granted provided that it
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* is identified as the "RSA Data Security, Inc. MD5 Message-Digest
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* Algorithm" in all material mentioning or referencing this software
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* or this function.
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*
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* License is also granted to make and use derivative works provided
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* that such works are identified as "derived from the RSA Data
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* Security, Inc. MD5 Message-Digest Algorithm" in all material
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* mentioning or referencing the derived work.
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*
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* RSA Data Security, Inc. makes no representations concerning either
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* the merchantability of this software or the suitability of this
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* software for any particular purpose. It is provided "as is"
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* without express or implied warranty of any kind.
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*
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* These notices must be retained in any copies of any part of this
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* documentation and/or software.
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*
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* $FreeBSD: src/lib/libmd/md5c.c,v 1.9.2.1 1999/08/29 14:57:12 peter Exp $
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*
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* This code is the same as the code published by RSA Inc. It has been
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* edited for clarity and style only.
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*
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* ----------------------------------------------------------------------------
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* The md5_crypt() function was taken from freeBSD's libcrypt and contains
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* this license:
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* "THE BEER-WARE LICENSE" (Revision 42):
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* <phk@login.dknet.dk> wrote this file. As long as you retain this notice you
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* can do whatever you want with this stuff. If we meet some day, and you think
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* this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp
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*
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* $FreeBSD: src/lib/libcrypt/crypt.c,v 1.7.2.1 1999/08/29 14:56:33 peter Exp $
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*
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* ----------------------------------------------------------------------------
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* On April 19th, 2001 md5_crypt() was modified to make it reentrant
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* by Erik Andersen <andersen@uclibc.org>
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*
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* June 28, 2001 Manuel Novoa III
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*
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* "Un-inlined" code using loops and static const tables in order to
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* reduce generated code size (on i386 from approx 4k to approx 2.5k).
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*
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* June 29, 2001 Manuel Novoa III
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*
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* Completely removed static PADDING array.
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*
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* Reintroduced the loop unrolling in md5_transform and added the
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* MD5_SMALL option for configurability. Define below as:
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* 0 fully unrolled loops
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* 1 partially unrolled (4 ops per loop)
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* 2 no unrolling -- introduces the need to swap 4 variables (slow)
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* 3 no unrolling and all 4 loops merged into one with switch
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* in each loop (glacial)
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* On i386, sizes are roughly (-Os -fno-builtin):
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* 0: 3k 1: 2.5k 2: 2.2k 3: 2k
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*
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* Since SuSv3 does not require crypt_r, modified again August 7, 2002
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* by Erik Andersen to remove reentrance stuff...
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*/
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#include "libbb.h"
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/* 1: fastest, 3: smallest */
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#if CONFIG_MD5_SMALL < 1
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# define MD5_SMALL 1
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#elif CONFIG_MD5_SMALL > 3
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# define MD5_SMALL 3
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#else
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# define MD5_SMALL CONFIG_MD5_SMALL
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#endif
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#if BB_LITTLE_ENDIAN
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#define memcpy32_cpu2le memcpy
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#define memcpy32_le2cpu memcpy
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#else
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/* Encodes input (uint32_t) into output (unsigned char).
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* Assumes len is a multiple of 4. */
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static void
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memcpy32_cpu2le(unsigned char *output, uint32_t *input, unsigned len)
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{
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unsigned i, j;
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for (i = 0, j = 0; j < len; i++, j += 4) {
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output[j] = input[i];
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output[j+1] = (input[i] >> 8);
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output[j+2] = (input[i] >> 16);
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output[j+3] = (input[i] >> 24);
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}
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}
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/* Decodes input (unsigned char) into output (uint32_t).
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* Assumes len is a multiple of 4. */
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static void
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memcpy32_le2cpu(uint32_t *output, const unsigned char *input, unsigned len)
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{
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unsigned i, j;
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for (i = 0, j = 0; j < len; i++, j += 4)
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output[i] = ((uint32_t)input[j])
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| (((uint32_t)input[j+1]) << 8)
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| (((uint32_t)input[j+2]) << 16)
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| (((uint32_t)input[j+3]) << 24);
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}
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#endif /* i386 */
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/* F, G, H and I are basic MD5 functions. */
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#define F(x, y, z) (((x) & (y)) | (~(x) & (z)))
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#define G(x, y, z) (((x) & (z)) | ((y) & ~(z)))
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#define H(x, y, z) ((x) ^ (y) ^ (z))
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#define I(x, y, z) ((y) ^ ((x) | ~(z)))
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/* rotl32 rotates x left n bits. */
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#define rotl32(x, n) (((x) << (n)) | ((x) >> (32 - (n))))
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/*
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* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
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* Rotation is separate from addition to prevent recomputation.
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*/
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#define FF(a, b, c, d, x, s, ac) { \
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(a) += F((b), (c), (d)) + (x) + (uint32_t)(ac); \
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(a) = rotl32((a), (s)); \
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(a) += (b); \
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}
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#define GG(a, b, c, d, x, s, ac) { \
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(a) += G((b), (c), (d)) + (x) + (uint32_t)(ac); \
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(a) = rotl32((a), (s)); \
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(a) += (b); \
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}
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#define HH(a, b, c, d, x, s, ac) { \
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(a) += H((b), (c), (d)) + (x) + (uint32_t)(ac); \
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(a) = rotl32((a), (s)); \
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(a) += (b); \
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}
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#define II(a, b, c, d, x, s, ac) { \
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(a) += I((b), (c), (d)) + (x) + (uint32_t)(ac); \
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(a) = rotl32((a), (s)); \
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(a) += (b); \
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}
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/* MD5 basic transformation. Transforms state based on block. */
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static void md5_transform(uint32_t state[4], const unsigned char block[64])
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{
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uint32_t a, b, c, d, x[16];
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#if MD5_SMALL > 1
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uint32_t temp;
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const unsigned char *ps;
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static const unsigned char S[] = {
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7, 12, 17, 22,
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5, 9, 14, 20,
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4, 11, 16, 23,
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6, 10, 15, 21
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};
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#endif /* MD5_SMALL > 1 */
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#if MD5_SMALL > 0
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const uint32_t *pc;
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const unsigned char *pp;
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int i;
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static const uint32_t C[] = {
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/* round 1 */
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0xd76aa478, 0xe8c7b756, 0x242070db, 0xc1bdceee,
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0xf57c0faf, 0x4787c62a, 0xa8304613, 0xfd469501,
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0x698098d8, 0x8b44f7af, 0xffff5bb1, 0x895cd7be,
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0x6b901122, 0xfd987193, 0xa679438e, 0x49b40821,
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/* round 2 */
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0xf61e2562, 0xc040b340, 0x265e5a51, 0xe9b6c7aa,
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0xd62f105d, 0x2441453, 0xd8a1e681, 0xe7d3fbc8,
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0x21e1cde6, 0xc33707d6, 0xf4d50d87, 0x455a14ed,
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0xa9e3e905, 0xfcefa3f8, 0x676f02d9, 0x8d2a4c8a,
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/* round 3 */
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0xfffa3942, 0x8771f681, 0x6d9d6122, 0xfde5380c,
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0xa4beea44, 0x4bdecfa9, 0xf6bb4b60, 0xbebfbc70,
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0x289b7ec6, 0xeaa127fa, 0xd4ef3085, 0x4881d05,
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0xd9d4d039, 0xe6db99e5, 0x1fa27cf8, 0xc4ac5665,
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/* round 4 */
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0xf4292244, 0x432aff97, 0xab9423a7, 0xfc93a039,
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0x655b59c3, 0x8f0ccc92, 0xffeff47d, 0x85845dd1,
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0x6fa87e4f, 0xfe2ce6e0, 0xa3014314, 0x4e0811a1,
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0xf7537e82, 0xbd3af235, 0x2ad7d2bb, 0xeb86d391
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};
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static const unsigned char P[] = {
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0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, /* 1 */
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1, 6, 11, 0, 5, 10, 15, 4, 9, 14, 3, 8, 13, 2, 7, 12, /* 2 */
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5, 8, 11, 14, 1, 4, 7, 10, 13, 0, 3, 6, 9, 12, 15, 2, /* 3 */
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0, 7, 14, 5, 12, 3, 10, 1, 8, 15, 6, 13, 4, 11, 2, 9 /* 4 */
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};
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#endif /* MD5_SMALL > 0 */
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memcpy32_le2cpu(x, block, 64);
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a = state[0];
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b = state[1];
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c = state[2];
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d = state[3];
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#if MD5_SMALL > 2
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pc = C;
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pp = P;
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ps = S - 4;
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for (i = 0; i < 64; i++) {
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if ((i & 0x0f) == 0) ps += 4;
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temp = a;
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switch (i>>4) {
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case 0:
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temp += F(b, c, d);
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break;
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case 1:
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temp += G(b, c, d);
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break;
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case 2:
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temp += H(b, c, d);
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break;
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case 3:
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temp += I(b, c, d);
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break;
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}
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temp += x[*pp++] + *pc++;
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temp = rotl32(temp, ps[i & 3]);
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temp += b;
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a = d; d = c; c = b; b = temp;
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}
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#elif MD5_SMALL > 1
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pc = C;
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pp = P;
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ps = S;
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/* Round 1 */
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for (i = 0; i < 16; i++) {
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FF(a, b, c, d, x[*pp], ps[i & 0x3], *pc); pp++; pc++;
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temp = d; d = c; c = b; b = a; a = temp;
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}
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/* Round 2 */
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ps += 4;
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for (; i < 32; i++) {
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GG(a, b, c, d, x[*pp], ps[i & 0x3], *pc); pp++; pc++;
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temp = d; d = c; c = b; b = a; a = temp;
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}
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/* Round 3 */
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ps += 4;
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for (; i < 48; i++) {
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HH(a, b, c, d, x[*pp], ps[i & 0x3], *pc); pp++; pc++;
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temp = d; d = c; c = b; b = a; a = temp;
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}
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/* Round 4 */
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ps += 4;
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for (; i < 64; i++) {
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II(a, b, c, d, x[*pp], ps[i & 0x3], *pc); pp++; pc++;
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temp = d; d = c; c = b; b = a; a = temp;
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}
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#elif MD5_SMALL > 0
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pc = C;
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pp = P;
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/* Round 1 */
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for (i = 0; i < 4; i++) {
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FF(a, b, c, d, x[*pp], 7, *pc); pp++; pc++;
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FF(d, a, b, c, x[*pp], 12, *pc); pp++; pc++;
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FF(c, d, a, b, x[*pp], 17, *pc); pp++; pc++;
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FF(b, c, d, a, x[*pp], 22, *pc); pp++; pc++;
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}
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/* Round 2 */
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for (i = 0; i < 4; i++) {
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GG(a, b, c, d, x[*pp], 5, *pc); pp++; pc++;
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GG(d, a, b, c, x[*pp], 9, *pc); pp++; pc++;
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GG(c, d, a, b, x[*pp], 14, *pc); pp++; pc++;
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GG(b, c, d, a, x[*pp], 20, *pc); pp++; pc++;
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}
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/* Round 3 */
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for (i = 0; i < 4; i++) {
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HH(a, b, c, d, x[*pp], 4, *pc); pp++; pc++;
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HH(d, a, b, c, x[*pp], 11, *pc); pp++; pc++;
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HH(c, d, a, b, x[*pp], 16, *pc); pp++; pc++;
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HH(b, c, d, a, x[*pp], 23, *pc); pp++; pc++;
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}
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/* Round 4 */
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for (i = 0; i < 4; i++) {
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II(a, b, c, d, x[*pp], 6, *pc); pp++; pc++;
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II(d, a, b, c, x[*pp], 10, *pc); pp++; pc++;
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II(c, d, a, b, x[*pp], 15, *pc); pp++; pc++;
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II(b, c, d, a, x[*pp], 21, *pc); pp++; pc++;
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}
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#else
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/* Round 1 */
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#define S11 7
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#define S12 12
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#define S13 17
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#define S14 22
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FF(a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */
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FF(d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */
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FF(c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */
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FF(b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */
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FF(a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */
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FF(d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */
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FF(c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */
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FF(b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */
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FF(a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */
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FF(d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */
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FF(c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */
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FF(b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */
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FF(a, b, c, d, x[12], S11, 0x6b901122); /* 13 */
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FF(d, a, b, c, x[13], S12, 0xfd987193); /* 14 */
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FF(c, d, a, b, x[14], S13, 0xa679438e); /* 15 */
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FF(b, c, d, a, x[15], S14, 0x49b40821); /* 16 */
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/* Round 2 */
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#define S21 5
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#define S22 9
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#define S23 14
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#define S24 20
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GG(a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */
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GG(d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */
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GG(c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */
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GG(b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */
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GG(a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */
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GG(d, a, b, c, x[10], S22, 0x2441453); /* 22 */
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GG(c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */
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GG(b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */
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GG(a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */
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GG(d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */
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GG(c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */
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GG(b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */
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GG(a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */
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GG(d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */
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GG(c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */
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GG(b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */
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/* Round 3 */
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#define S31 4
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#define S32 11
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#define S33 16
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#define S34 23
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HH(a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */
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HH(d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */
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HH(c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */
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HH(b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */
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HH(a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */
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HH(d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */
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HH(c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */
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HH(b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */
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HH(a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */
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HH(d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */
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HH(c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */
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HH(b, c, d, a, x[ 6], S34, 0x4881d05); /* 44 */
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HH(a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */
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HH(d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */
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HH(c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */
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HH(b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */
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/* Round 4 */
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#define S41 6
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#define S42 10
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#define S43 15
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#define S44 21
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II(a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */
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II(d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */
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II(c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */
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II(b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */
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II(a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */
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II(d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */
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II(c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */
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II(b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */
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II(a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */
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II(d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */
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II(c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */
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II(b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */
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II(a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */
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II(d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */
|
|
II(c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */
|
|
II(b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */
|
|
#endif
|
|
|
|
state[0] += a;
|
|
state[1] += b;
|
|
state[2] += c;
|
|
state[3] += d;
|
|
|
|
/* Zeroize sensitive information. */
|
|
memset(x, 0, sizeof(x));
|
|
}
|
|
|
|
|
|
/* MD5 initialization. */
|
|
void FAST_FUNC md5_begin(md5_ctx_t *context)
|
|
{
|
|
context->count[0] = context->count[1] = 0;
|
|
/* Load magic initialization constants. */
|
|
context->state[0] = 0x67452301;
|
|
context->state[1] = 0xefcdab89;
|
|
context->state[2] = 0x98badcfe;
|
|
context->state[3] = 0x10325476;
|
|
}
|
|
|
|
/*
|
|
* MD5 block update operation. Continues an MD5 message-digest
|
|
* operation, processing another message block, and updating
|
|
* the context.
|
|
*/
|
|
void FAST_FUNC md5_hash(const void *buffer, size_t inputLen, md5_ctx_t *context)
|
|
{
|
|
unsigned i, idx, partLen;
|
|
const unsigned char *input = buffer;
|
|
|
|
/* Compute number of bytes mod 64 */
|
|
idx = (context->count[0] >> 3) & 0x3F;
|
|
|
|
/* Update number of bits */
|
|
context->count[0] += (inputLen << 3);
|
|
if (context->count[0] < (inputLen << 3))
|
|
context->count[1]++;
|
|
context->count[1] += (inputLen >> 29);
|
|
|
|
/* Transform as many times as possible. */
|
|
i = 0;
|
|
partLen = 64 - idx;
|
|
if (inputLen >= partLen) {
|
|
memcpy(&context->buffer[idx], input, partLen);
|
|
md5_transform(context->state, context->buffer);
|
|
for (i = partLen; i + 63 < inputLen; i += 64)
|
|
md5_transform(context->state, &input[i]);
|
|
idx = 0;
|
|
}
|
|
|
|
/* Buffer remaining input */
|
|
memcpy(&context->buffer[idx], &input[i], inputLen - i);
|
|
}
|
|
|
|
/*
|
|
* MD5 finalization. Ends an MD5 message-digest operation,
|
|
* writing the message digest.
|
|
*/
|
|
unsigned FAST_FUNC md5_end(void *digest, md5_ctx_t *context)
|
|
{
|
|
unsigned idx, padLen;
|
|
unsigned char bits[8];
|
|
unsigned char padding[64];
|
|
|
|
/* Add padding followed by original length. */
|
|
memset(padding, 0, sizeof(padding));
|
|
padding[0] = 0x80;
|
|
/* save number of bits */
|
|
memcpy32_cpu2le(bits, context->count, 8);
|
|
/* pad out to 56 mod 64 */
|
|
idx = (context->count[0] >> 3) & 0x3f;
|
|
padLen = (idx < 56) ? (56 - idx) : (120 - idx);
|
|
md5_hash(padding, padLen, context);
|
|
/* append length (before padding) */
|
|
md5_hash(bits, 8, context);
|
|
|
|
/* Store state in digest */
|
|
memcpy32_cpu2le(digest, context->state, 16);
|
|
return 16;
|
|
}
|