403 lines
11 KiB
C
403 lines
11 KiB
C
/*
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* This code implements the MD5 message-digest algorithm.
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* The algorithm is due to Ron Rivest. This code was
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* written by Colin Plumb in 1993, no copyright is claimed.
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* This code is in the public domain; do with it what you wish.
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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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#include "../globals.h"
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#include "../oscam-string.h"
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#include "md5.h"
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#if !defined(WITH_SSL) && !defined(WITH_LIBCRYPTO)
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#ifdef __i386__
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#define byteReverse(a, b)
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#else
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/*
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* Note: This code is harmless on little-endian machines.
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* The ifdefs are just a small optimization
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*/
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static void byteReverse(unsigned char *buf, unsigned int longs)
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{
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uint32_t t;
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do
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{
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t = (uint32_t)((unsigned int)buf[3] << 8 | buf[2]) << 16 |
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((unsigned int)buf[1] << 8 | buf[0]);
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memcpy(buf, &t, 4);
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buf += 4;
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}
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while(--longs);
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}
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#endif
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/* The four core functions - F1 is optimized somewhat */
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/* #define F1(x, y, z) (x & y | ~x & z) */
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#define F1(x, y, z) (z ^ (x & (y ^ z)))
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#define F2(x, y, z) F1(z, x, y)
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#define F3(x, y, z) (x ^ y ^ z)
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#define F4(x, y, z) (y ^ (x | ~z))
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/* This is the central step in the MD5 algorithm. */
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#define MD5STEP(f, w, x, y, z, data, s) \
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( w += f(x, y, z) + data, w = w<<s | w>>(32-s), w += x )
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/*
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* The core of the MD5 algorithm, this alters an existing MD5 hash to
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* reflect the addition of 16 longwords of new data. MD5_Update blocks
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* the data and converts bytes into longwords for this routine.
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*/
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static void MD5_Transform(uint32_t buf[4], uint32_t in[16])
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{
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uint32_t a = buf[0];
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uint32_t b = buf[1];
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uint32_t c = buf[2];
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uint32_t d = buf[3];
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MD5STEP(F1, a, b, c, d, in[ 0] + 0xd76aa478, 7);
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MD5STEP(F1, d, a, b, c, in[ 1] + 0xe8c7b756, 12);
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MD5STEP(F1, c, d, a, b, in[ 2] + 0x242070db, 17);
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MD5STEP(F1, b, c, d, a, in[ 3] + 0xc1bdceee, 22);
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MD5STEP(F1, a, b, c, d, in[ 4] + 0xf57c0faf, 7);
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MD5STEP(F1, d, a, b, c, in[ 5] + 0x4787c62a, 12);
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MD5STEP(F1, c, d, a, b, in[ 6] + 0xa8304613, 17);
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MD5STEP(F1, b, c, d, a, in[ 7] + 0xfd469501, 22);
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MD5STEP(F1, a, b, c, d, in[ 8] + 0x698098d8, 7);
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MD5STEP(F1, d, a, b, c, in[ 9] + 0x8b44f7af, 12);
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MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17);
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MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22);
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MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7);
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MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12);
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MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17);
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MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22);
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MD5STEP(F2, a, b, c, d, in[ 1] + 0xf61e2562, 5);
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MD5STEP(F2, d, a, b, c, in[ 6] + 0xc040b340, 9);
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MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14);
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MD5STEP(F2, b, c, d, a, in[ 0] + 0xe9b6c7aa, 20);
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MD5STEP(F2, a, b, c, d, in[ 5] + 0xd62f105d, 5);
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MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9);
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MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14);
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MD5STEP(F2, b, c, d, a, in[ 4] + 0xe7d3fbc8, 20);
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MD5STEP(F2, a, b, c, d, in[ 9] + 0x21e1cde6, 5);
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MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9);
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MD5STEP(F2, c, d, a, b, in[ 3] + 0xf4d50d87, 14);
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MD5STEP(F2, b, c, d, a, in[ 8] + 0x455a14ed, 20);
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MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5);
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MD5STEP(F2, d, a, b, c, in[ 2] + 0xfcefa3f8, 9);
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MD5STEP(F2, c, d, a, b, in[ 7] + 0x676f02d9, 14);
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MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);
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MD5STEP(F3, a, b, c, d, in[ 5] + 0xfffa3942, 4);
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MD5STEP(F3, d, a, b, c, in[ 8] + 0x8771f681, 11);
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MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16);
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MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23);
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MD5STEP(F3, a, b, c, d, in[ 1] + 0xa4beea44, 4);
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MD5STEP(F3, d, a, b, c, in[ 4] + 0x4bdecfa9, 11);
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MD5STEP(F3, c, d, a, b, in[ 7] + 0xf6bb4b60, 16);
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MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23);
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MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4);
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MD5STEP(F3, d, a, b, c, in[ 0] + 0xeaa127fa, 11);
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MD5STEP(F3, c, d, a, b, in[ 3] + 0xd4ef3085, 16);
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MD5STEP(F3, b, c, d, a, in[ 6] + 0x04881d05, 23);
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MD5STEP(F3, a, b, c, d, in[ 9] + 0xd9d4d039, 4);
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MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11);
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MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
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MD5STEP(F3, b, c, d, a, in[ 2] + 0xc4ac5665, 23);
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MD5STEP(F4, a, b, c, d, in[ 0] + 0xf4292244, 6);
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MD5STEP(F4, d, a, b, c, in[ 7] + 0x432aff97, 10);
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MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15);
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MD5STEP(F4, b, c, d, a, in[ 5] + 0xfc93a039, 21);
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MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6);
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MD5STEP(F4, d, a, b, c, in[ 3] + 0x8f0ccc92, 10);
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MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15);
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MD5STEP(F4, b, c, d, a, in[ 1] + 0x85845dd1, 21);
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MD5STEP(F4, a, b, c, d, in[ 8] + 0x6fa87e4f, 6);
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MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
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MD5STEP(F4, c, d, a, b, in[ 6] + 0xa3014314, 15);
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MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
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MD5STEP(F4, a, b, c, d, in[ 4] + 0xf7537e82, 6);
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MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10);
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MD5STEP(F4, c, d, a, b, in[ 2] + 0x2ad7d2bb, 15);
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MD5STEP(F4, b, c, d, a, in[ 9] + 0xeb86d391, 21);
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buf[0] += a;
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buf[1] += b;
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buf[2] += c;
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buf[3] += d;
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}
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/*
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* Start MD5 accumulation. Set bit count to 0 and buffer to mysterious
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* initialization constants.
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*/
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void MD5_Init(MD5_CTX *ctx)
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{
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ctx->buf[0] = 0x67452301;
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ctx->buf[1] = 0xefcdab89;
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ctx->buf[2] = 0x98badcfe;
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ctx->buf[3] = 0x10325476;
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ctx->bits[0] = 0;
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ctx->bits[1] = 0;
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}
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/*
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* Update context to reflect the concatenation of another buffer full
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* of bytes.
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*/
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void MD5_Update(MD5_CTX *ctx, const unsigned char *buf, unsigned int len)
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{
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uint32_t t;
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/* Update bitcount */
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t = ctx->bits[0];
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if((ctx->bits[0] = t + ((uint32_t) len << 3)) < t)
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{ ctx->bits[1]++; } /* Carry from low to high */
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ctx->bits[1] += len >> 29;
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t = (t >> 3) & 0x3f; /* Bytes already in shsInfo->data */
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/* Handle any leading odd-sized chunks */
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if(t)
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{
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unsigned char *p = ((unsigned char *)ctx->in) + t;
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t = 64 - t;
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if(len < t)
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{
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memcpy(p, buf, len);
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return;
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}
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memcpy(p, buf, t);
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byteReverse((unsigned char *)ctx->in, 16);
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MD5_Transform(ctx->buf, ctx->in);
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buf += t;
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len -= t;
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}
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/* Process data in 64-byte chunks */
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while(len >= 64)
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{
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memcpy(ctx->in, buf, 64);
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byteReverse((unsigned char *)ctx->in, 16);
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MD5_Transform(ctx->buf, ctx->in);
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buf += 64;
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len -= 64;
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}
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/* Handle any remaining bytes of data. */
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memcpy(ctx->in, buf, len);
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}
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/*
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* Final wrapup - pad to 64-byte boundary with the bit pattern
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* 1 0* (64-bit count of bits processed, MSB-first)
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*/
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void MD5_Final(unsigned char digest[MD5_DIGEST_LENGTH], MD5_CTX *ctx)
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{
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unsigned count;
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unsigned char *p;
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/* Compute number of bytes mod 64 */
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count = (ctx->bits[0] >> 3) & 0x3F;
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/* Set the first char of padding to 0x80. This is safe since there is
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always at least one byte free */
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p = ((unsigned char *)ctx->in) + count;
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*p++ = 0x80;
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/* Bytes of padding needed to make 64 bytes */
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count = 64 - 1 - count;
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/* Pad out to 56 mod 64 */
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if(count < 8)
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{
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/* Two lots of padding: Pad the first block to 64 bytes */
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memset(p, 0, count);
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byteReverse((unsigned char *)ctx->in, 16);
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MD5_Transform(ctx->buf, ctx->in);
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/* Now fill the next block with 56 bytes */
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memset(ctx->in, 0, 56);
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}
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else
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{
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/* Pad block to 56 bytes */
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memset(p, 0, count - 8);
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}
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byteReverse((unsigned char *)ctx->in, 14);
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/* Append length in bits and transform */
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uint32_t *c = ctx->in;
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c[14] = ctx->bits[0];
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c[15] = ctx->bits[1];
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MD5_Transform(ctx->buf, ctx->in);
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byteReverse((unsigned char *) ctx->buf, 4);
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memcpy(digest, ctx->buf, 16);
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memset(ctx, 0, sizeof(struct MD5Context)); /* In case it's sensitive */
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}
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unsigned char *MD5(const unsigned char *input, unsigned long len, unsigned char *output)
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{
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MD5_CTX ctx;
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MD5_Init(&ctx);
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MD5_Update(&ctx, input, len);
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MD5_Final(output, &ctx);
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memset(&ctx, 0, sizeof(ctx)); /* security consideration */
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return output;
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}
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#endif
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/* This string is magic for this algorithm. Having
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it this way, we can get better later on */
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static const char __md5__magic[] = "$1$";
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/* 0 ... 63 => ascii - 64 */
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static const unsigned char __md5_itoa64[] =
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"./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
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static void __md5_to64(char *s, unsigned long v, int n)
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{
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while(--n >= 0)
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{
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*s++ = __md5_itoa64[v & 0x3f];
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v >>= 6;
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}
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}
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/*
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* UNIX password
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*
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* Use MD5 for what it is best at...
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*/
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char *__md5_crypt(const char *pw, const char *salt, char *passwd)
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{
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const char *sp, *ep;
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char *p;
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unsigned char final[17]; /* final[16] exists only to aid in looping */
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int sl, pl, i, __md5__magic_len, pw_len;
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MD5_CTX ctx, ctx1;
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unsigned long l;
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/* Refine the Salt first */
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sp = salt;
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/* If it starts with the magic string, then skip that */
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__md5__magic_len = cs_strlen(__md5__magic);
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if(!strncmp(sp, __md5__magic, __md5__magic_len))
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{ sp += __md5__magic_len; }
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/* It stops at the first '$', max 8 chars */
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for(ep = sp; *ep && *ep != '$' && ep < (sp + 8); ep++)
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{ continue; }
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/* get the length of the true salt */
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sl = ep - sp;
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MD5_Init(&ctx);
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/* The password first, since that is what is most unknown */
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pw_len = cs_strlen(pw);
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MD5_Update(&ctx, (const unsigned char *)pw, pw_len);
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/* Then our magic string */
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MD5_Update(&ctx, (const unsigned char *)__md5__magic, __md5__magic_len);
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/* Then the raw salt */
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MD5_Update(&ctx, (const unsigned char *)sp, sl);
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/* Then just as many characters of the MD5(pw,salt,pw) */
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MD5_Init(&ctx1);
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MD5_Update(&ctx1, (const unsigned char *)pw, pw_len);
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MD5_Update(&ctx1, (const unsigned char *)sp, sl);
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MD5_Update(&ctx1, (const unsigned char *)pw, pw_len);
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MD5_Final(final, &ctx1);
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for(pl = pw_len; pl > 0; pl -= 16)
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{ MD5_Update(&ctx, (const unsigned char *)final, pl > 16 ? 16 : pl); }
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/* Don't leave anything around in vm they could use. */
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memset(final, 0, sizeof final);
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/* Then something really weird... */
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for(i = pw_len; i ; i >>= 1)
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{
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MD5_Update(&ctx, ((i & 1) ? final : (const unsigned char *) pw), 1);
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}
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/* Now make the output string */
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strncpy(passwd, __md5__magic, 4); // This should be safe
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strncat(passwd, sp, sl);
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strcat(passwd, "$");
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MD5_Final(final, &ctx);
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/*
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* and now, just to make sure things don't run too fast
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* On a 60 Mhz Pentium this takes 34 msec, so you would
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* need 30 seconds to build a 1000 entry dictionary...
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*/
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for(i = 0; i < 1000; i++)
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{
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MD5_Init(&ctx1);
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if(i & 1)
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{ MD5_Update(&ctx1, (const unsigned char *)pw, pw_len); }
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else
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{ MD5_Update(&ctx1, (const unsigned char *)final, 16); }
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if(i % 3)
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{ MD5_Update(&ctx1, (const unsigned char *)sp, sl); }
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if(i % 7)
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{ MD5_Update(&ctx1, (const unsigned char *)pw, pw_len); }
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if(i & 1)
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{ MD5_Update(&ctx1, (const unsigned char *)final, 16); }
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else
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{ MD5_Update(&ctx1, (const unsigned char *)pw, pw_len); }
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MD5_Final(final, &ctx1);
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}
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p = passwd + cs_strlen(passwd);
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final[16] = final[5];
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for(i = 0 ; i < 5 ; i++)
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{
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l = (final[i] << 16) | (final[i + 6] << 8) | final[i + 12];
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__md5_to64(p, l, 4);
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p += 4;
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}
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l = final[11];
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__md5_to64(p, l, 2);
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p += 2;
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*p = '\0';
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/* Don't leave anything around in vm they could use. */
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memset(final, 0, sizeof final);
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return passwd;
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}
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