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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