[164] | 1 | /*
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| 2 | ***********************************************************************
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| 3 | ** md5.c -- the source code for MD5 routines **
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| 4 | ** RSA Data Security, Inc. MD5 Message-Digest Algorithm **
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| 5 | ** Created: 2/17/90 RLR **
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| 6 | ** Revised: 1/91 SRD,AJ,BSK,JT Reference C ver., 7/10 constant corr. **
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| 7 | ***********************************************************************
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| 8 | */
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| 9 |
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| 10 | /*
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| 11 | ***********************************************************************
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| 12 | ** Copyright (C) 1990, RSA Data Security, Inc. All rights reserved. **
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| 13 | ** **
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| 14 | ** License to copy and use this software is granted provided that **
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| 15 | ** it is identified as the "RSA Data Security, Inc. MD5 Message- **
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| 16 | ** Digest Algorithm" in all material mentioning or referencing this **
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| 17 | ** software or this function. **
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| 18 | ** **
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| 19 | ** License is also granted to make and use derivative works **
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| 20 | ** provided that such works are identified as "derived from the RSA **
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| 21 | ** Data Security, Inc. MD5 Message-Digest Algorithm" in all **
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| 22 | ** material mentioning or referencing the derived work. **
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| 23 | ** **
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| 24 | ** RSA Data Security, Inc. makes no representations concerning **
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| 25 | ** either the merchantability of this software or the suitability **
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| 26 | ** of this software for any particular purpose. It is provided "as **
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| 27 | ** is" without express or implied warranty of any kind. **
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| 28 | ** **
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| 29 | ** These notices must be retained in any copies of any part of this **
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| 30 | ** documentation and/or software. **
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| 31 | ***********************************************************************
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| 32 | */
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| 33 |
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| 34 | #include "lwip/opt.h"
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| 35 |
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| 36 | #if PPP_SUPPORT /* don't build if not configured for use in lwipopts.h */
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| 37 |
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| 38 | #if CHAP_SUPPORT || MD5_SUPPORT
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| 39 |
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| 40 | #include "ppp_impl.h"
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| 41 | #include "pppdebug.h"
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| 42 |
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| 43 | #include "md5.h"
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| 44 |
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| 45 | #include <string.h>
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| 46 |
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| 47 | /*
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| 48 | ***********************************************************************
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| 49 | ** Message-digest routines: **
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| 50 | ** To form the message digest for a message M **
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| 51 | ** (1) Initialize a context buffer mdContext using MD5Init **
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| 52 | ** (2) Call MD5Update on mdContext and M **
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| 53 | ** (3) Call MD5Final on mdContext **
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| 54 | ** The message digest is now in mdContext->digest[0...15] **
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| 55 | ***********************************************************************
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| 56 | */
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| 57 |
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| 58 | /* forward declaration */
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| 59 | static void Transform (u32_t *buf, u32_t *in);
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| 60 |
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| 61 | static unsigned char PADDING[64] = {
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| 62 | 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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| 63 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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| 64 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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| 65 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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| 66 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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| 67 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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| 68 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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| 69 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
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| 70 | };
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| 71 |
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| 72 | /* F, G, H and I are basic MD5 functions */
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| 73 | #define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
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| 74 | #define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
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| 75 | #define H(x, y, z) ((x) ^ (y) ^ (z))
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| 76 | #define I(x, y, z) ((y) ^ ((x) | (~z)))
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| 77 |
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| 78 | /* ROTATE_LEFT rotates x left n bits */
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| 79 | #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
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| 80 |
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| 81 | /* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4 */
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| 82 | /* Rotation is separate from addition to prevent recomputation */
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| 83 | #define FF(a, b, c, d, x, s, ac) \
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| 84 | {(a) += F ((b), (c), (d)) + (x) + (u32_t)(ac); \
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| 85 | (a) = ROTATE_LEFT ((a), (s)); \
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| 86 | (a) += (b); \
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| 87 | }
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| 88 | #define GG(a, b, c, d, x, s, ac) \
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| 89 | {(a) += G ((b), (c), (d)) + (x) + (u32_t)(ac); \
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| 90 | (a) = ROTATE_LEFT ((a), (s)); \
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| 91 | (a) += (b); \
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| 92 | }
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| 93 | #define HH(a, b, c, d, x, s, ac) \
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| 94 | {(a) += H ((b), (c), (d)) + (x) + (u32_t)(ac); \
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| 95 | (a) = ROTATE_LEFT ((a), (s)); \
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| 96 | (a) += (b); \
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| 97 | }
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| 98 | #define II(a, b, c, d, x, s, ac) \
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| 99 | {(a) += I ((b), (c), (d)) + (x) + (u32_t)(ac); \
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| 100 | (a) = ROTATE_LEFT ((a), (s)); \
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| 101 | (a) += (b); \
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| 102 | }
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| 103 |
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| 104 | #ifdef __STDC__
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| 105 | #define UL(x) x##UL
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| 106 | #else
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| 107 | #ifdef WIN32
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| 108 | #define UL(x) x##UL
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| 109 | #else
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| 110 | #define UL(x) x
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| 111 | #endif
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| 112 | #endif
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| 113 |
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| 114 | /* The routine MD5Init initializes the message-digest context
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| 115 | mdContext. All fields are set to zero.
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| 116 | */
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| 117 | void
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| 118 | MD5Init (MD5_CTX *mdContext)
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| 119 | {
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| 120 | mdContext->i[0] = mdContext->i[1] = (u32_t)0;
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| 121 |
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| 122 | /* Load magic initialization constants. */
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| 123 | mdContext->buf[0] = (u32_t)0x67452301UL;
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| 124 | mdContext->buf[1] = (u32_t)0xefcdab89UL;
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| 125 | mdContext->buf[2] = (u32_t)0x98badcfeUL;
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| 126 | mdContext->buf[3] = (u32_t)0x10325476UL;
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| 127 | }
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| 128 |
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| 129 | /* The routine MD5Update updates the message-digest context to
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| 130 | account for the presence of each of the characters inBuf[0..inLen-1]
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| 131 | in the message whose digest is being computed.
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| 132 | */
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| 133 | void
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| 134 | MD5Update(MD5_CTX *mdContext, unsigned char *inBuf, unsigned int inLen)
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| 135 | {
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| 136 | u32_t in[16];
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| 137 | int mdi;
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| 138 | unsigned int i, ii;
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| 139 |
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| 140 | #if 0
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| 141 | PPPDEBUG(LOG_INFO, ("MD5Update: %u:%.*H\n", inLen, LWIP_MIN(inLen, 20) * 2, inBuf));
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| 142 | PPPDEBUG(LOG_INFO, ("MD5Update: %u:%s\n", inLen, inBuf));
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| 143 | #endif
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| 144 |
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| 145 | /* compute number of bytes mod 64 */
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| 146 | mdi = (int)((mdContext->i[0] >> 3) & 0x3F);
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| 147 |
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| 148 | /* update number of bits */
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| 149 | if ((mdContext->i[0] + ((u32_t)inLen << 3)) < mdContext->i[0]) {
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| 150 | mdContext->i[1]++;
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| 151 | }
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| 152 | mdContext->i[0] += ((u32_t)inLen << 3);
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| 153 | mdContext->i[1] += ((u32_t)inLen >> 29);
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| 154 |
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| 155 | while (inLen--) {
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| 156 | /* add new character to buffer, increment mdi */
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| 157 | mdContext->in[mdi++] = *inBuf++;
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| 158 |
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| 159 | /* transform if necessary */
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| 160 | if (mdi == 0x40) {
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| 161 | for (i = 0, ii = 0; i < 16; i++, ii += 4) {
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| 162 | in[i] = (((u32_t)mdContext->in[ii+3]) << 24) |
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| 163 | (((u32_t)mdContext->in[ii+2]) << 16) |
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| 164 | (((u32_t)mdContext->in[ii+1]) << 8) |
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| 165 | ((u32_t)mdContext->in[ii]);
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| 166 | }
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| 167 | Transform (mdContext->buf, in);
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| 168 | mdi = 0;
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| 169 | }
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| 170 | }
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| 171 | }
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| 172 |
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| 173 | /* The routine MD5Final terminates the message-digest computation and
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| 174 | ends with the desired message digest in mdContext->digest[0...15].
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| 175 | */
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| 176 | void
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| 177 | MD5Final (unsigned char hash[], MD5_CTX *mdContext)
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| 178 | {
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| 179 | u32_t in[16];
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| 180 | int mdi;
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| 181 | unsigned int i, ii;
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| 182 | unsigned int padLen;
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| 183 |
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| 184 | /* save number of bits */
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| 185 | in[14] = mdContext->i[0];
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| 186 | in[15] = mdContext->i[1];
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| 187 |
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| 188 | /* compute number of bytes mod 64 */
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| 189 | mdi = (int)((mdContext->i[0] >> 3) & 0x3F);
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| 190 |
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| 191 | /* pad out to 56 mod 64 */
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| 192 | padLen = (mdi < 56) ? (56 - mdi) : (120 - mdi);
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| 193 | MD5Update (mdContext, PADDING, padLen);
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| 194 |
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| 195 | /* append length in bits and transform */
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| 196 | for (i = 0, ii = 0; i < 14; i++, ii += 4) {
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| 197 | in[i] = (((u32_t)mdContext->in[ii+3]) << 24) |
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| 198 | (((u32_t)mdContext->in[ii+2]) << 16) |
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| 199 | (((u32_t)mdContext->in[ii+1]) << 8) |
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| 200 | ((u32_t)mdContext->in[ii]);
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| 201 | }
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| 202 | Transform (mdContext->buf, in);
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| 203 |
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| 204 | /* store buffer in digest */
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| 205 | for (i = 0, ii = 0; i < 4; i++, ii += 4) {
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| 206 | mdContext->digest[ii] = (unsigned char)(mdContext->buf[i] & 0xFF);
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| 207 | mdContext->digest[ii+1] =
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| 208 | (unsigned char)((mdContext->buf[i] >> 8) & 0xFF);
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| 209 | mdContext->digest[ii+2] =
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| 210 | (unsigned char)((mdContext->buf[i] >> 16) & 0xFF);
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| 211 | mdContext->digest[ii+3] =
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| 212 | (unsigned char)((mdContext->buf[i] >> 24) & 0xFF);
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| 213 | }
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| 214 | SMEMCPY(hash, mdContext->digest, 16);
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| 215 | }
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| 216 |
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| 217 | /* Basic MD5 step. Transforms buf based on in.
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| 218 | */
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| 219 | static void
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| 220 | Transform (u32_t *buf, u32_t *in)
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| 221 | {
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| 222 | u32_t a = buf[0], b = buf[1], c = buf[2], d = buf[3];
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| 223 |
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| 224 | /* Round 1 */
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| 225 | #define S11 7
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| 226 | #define S12 12
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| 227 | #define S13 17
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| 228 | #define S14 22
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| 229 | FF ( a, b, c, d, in[ 0], S11, UL(3614090360)); /* 1 */
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| 230 | FF ( d, a, b, c, in[ 1], S12, UL(3905402710)); /* 2 */
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| 231 | FF ( c, d, a, b, in[ 2], S13, UL( 606105819)); /* 3 */
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| 232 | FF ( b, c, d, a, in[ 3], S14, UL(3250441966)); /* 4 */
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| 233 | FF ( a, b, c, d, in[ 4], S11, UL(4118548399)); /* 5 */
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| 234 | FF ( d, a, b, c, in[ 5], S12, UL(1200080426)); /* 6 */
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| 235 | FF ( c, d, a, b, in[ 6], S13, UL(2821735955)); /* 7 */
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| 236 | FF ( b, c, d, a, in[ 7], S14, UL(4249261313)); /* 8 */
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| 237 | FF ( a, b, c, d, in[ 8], S11, UL(1770035416)); /* 9 */
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| 238 | FF ( d, a, b, c, in[ 9], S12, UL(2336552879)); /* 10 */
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| 239 | FF ( c, d, a, b, in[10], S13, UL(4294925233)); /* 11 */
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| 240 | FF ( b, c, d, a, in[11], S14, UL(2304563134)); /* 12 */
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| 241 | FF ( a, b, c, d, in[12], S11, UL(1804603682)); /* 13 */
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| 242 | FF ( d, a, b, c, in[13], S12, UL(4254626195)); /* 14 */
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| 243 | FF ( c, d, a, b, in[14], S13, UL(2792965006)); /* 15 */
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| 244 | FF ( b, c, d, a, in[15], S14, UL(1236535329)); /* 16 */
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| 245 |
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| 246 | /* Round 2 */
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| 247 | #define S21 5
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| 248 | #define S22 9
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| 249 | #define S23 14
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| 250 | #define S24 20
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| 251 | GG ( a, b, c, d, in[ 1], S21, UL(4129170786)); /* 17 */
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| 252 | GG ( d, a, b, c, in[ 6], S22, UL(3225465664)); /* 18 */
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| 253 | GG ( c, d, a, b, in[11], S23, UL( 643717713)); /* 19 */
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| 254 | GG ( b, c, d, a, in[ 0], S24, UL(3921069994)); /* 20 */
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| 255 | GG ( a, b, c, d, in[ 5], S21, UL(3593408605)); /* 21 */
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| 256 | GG ( d, a, b, c, in[10], S22, UL( 38016083)); /* 22 */
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| 257 | GG ( c, d, a, b, in[15], S23, UL(3634488961)); /* 23 */
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| 258 | GG ( b, c, d, a, in[ 4], S24, UL(3889429448)); /* 24 */
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| 259 | GG ( a, b, c, d, in[ 9], S21, UL( 568446438)); /* 25 */
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| 260 | GG ( d, a, b, c, in[14], S22, UL(3275163606)); /* 26 */
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| 261 | GG ( c, d, a, b, in[ 3], S23, UL(4107603335)); /* 27 */
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| 262 | GG ( b, c, d, a, in[ 8], S24, UL(1163531501)); /* 28 */
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| 263 | GG ( a, b, c, d, in[13], S21, UL(2850285829)); /* 29 */
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| 264 | GG ( d, a, b, c, in[ 2], S22, UL(4243563512)); /* 30 */
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| 265 | GG ( c, d, a, b, in[ 7], S23, UL(1735328473)); /* 31 */
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| 266 | GG ( b, c, d, a, in[12], S24, UL(2368359562)); /* 32 */
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| 267 |
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| 268 | /* Round 3 */
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| 269 | #define S31 4
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| 270 | #define S32 11
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| 271 | #define S33 16
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| 272 | #define S34 23
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| 273 | HH ( a, b, c, d, in[ 5], S31, UL(4294588738)); /* 33 */
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| 274 | HH ( d, a, b, c, in[ 8], S32, UL(2272392833)); /* 34 */
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| 275 | HH ( c, d, a, b, in[11], S33, UL(1839030562)); /* 35 */
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| 276 | HH ( b, c, d, a, in[14], S34, UL(4259657740)); /* 36 */
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| 277 | HH ( a, b, c, d, in[ 1], S31, UL(2763975236)); /* 37 */
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| 278 | HH ( d, a, b, c, in[ 4], S32, UL(1272893353)); /* 38 */
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| 279 | HH ( c, d, a, b, in[ 7], S33, UL(4139469664)); /* 39 */
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| 280 | HH ( b, c, d, a, in[10], S34, UL(3200236656)); /* 40 */
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| 281 | HH ( a, b, c, d, in[13], S31, UL( 681279174)); /* 41 */
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| 282 | HH ( d, a, b, c, in[ 0], S32, UL(3936430074)); /* 42 */
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| 283 | HH ( c, d, a, b, in[ 3], S33, UL(3572445317)); /* 43 */
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| 284 | HH ( b, c, d, a, in[ 6], S34, UL( 76029189)); /* 44 */
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| 285 | HH ( a, b, c, d, in[ 9], S31, UL(3654602809)); /* 45 */
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| 286 | HH ( d, a, b, c, in[12], S32, UL(3873151461)); /* 46 */
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| 287 | HH ( c, d, a, b, in[15], S33, UL( 530742520)); /* 47 */
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| 288 | HH ( b, c, d, a, in[ 2], S34, UL(3299628645)); /* 48 */
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| 289 |
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| 290 | /* Round 4 */
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| 291 | #define S41 6
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| 292 | #define S42 10
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| 293 | #define S43 15
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| 294 | #define S44 21
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| 295 | II ( a, b, c, d, in[ 0], S41, UL(4096336452)); /* 49 */
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| 296 | II ( d, a, b, c, in[ 7], S42, UL(1126891415)); /* 50 */
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| 297 | II ( c, d, a, b, in[14], S43, UL(2878612391)); /* 51 */
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| 298 | II ( b, c, d, a, in[ 5], S44, UL(4237533241)); /* 52 */
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| 299 | II ( a, b, c, d, in[12], S41, UL(1700485571)); /* 53 */
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| 300 | II ( d, a, b, c, in[ 3], S42, UL(2399980690)); /* 54 */
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| 301 | II ( c, d, a, b, in[10], S43, UL(4293915773)); /* 55 */
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| 302 | II ( b, c, d, a, in[ 1], S44, UL(2240044497)); /* 56 */
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| 303 | II ( a, b, c, d, in[ 8], S41, UL(1873313359)); /* 57 */
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| 304 | II ( d, a, b, c, in[15], S42, UL(4264355552)); /* 58 */
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| 305 | II ( c, d, a, b, in[ 6], S43, UL(2734768916)); /* 59 */
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| 306 | II ( b, c, d, a, in[13], S44, UL(1309151649)); /* 60 */
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| 307 | II ( a, b, c, d, in[ 4], S41, UL(4149444226)); /* 61 */
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| 308 | II ( d, a, b, c, in[11], S42, UL(3174756917)); /* 62 */
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| 309 | II ( c, d, a, b, in[ 2], S43, UL( 718787259)); /* 63 */
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| 310 | II ( b, c, d, a, in[ 9], S44, UL(3951481745)); /* 64 */
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| 311 |
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| 312 | buf[0] += a;
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| 313 | buf[1] += b;
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| 314 | buf[2] += c;
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| 315 | buf[3] += d;
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| 316 | }
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| 317 |
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| 318 | #endif /* CHAP_SUPPORT || MD5_SUPPORT */
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| 319 |
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| 320 | #endif /* PPP_SUPPORT */
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