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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11 ***********************************************************************
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12 ** Copyright (C) 1990, RSA Data Security, Inc. All rights reserved. **
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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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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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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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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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36 #include "pppdebug.h"
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38 #if CHAP_SUPPORT > 0 || MD5_SUPPORT > 0
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41 ***********************************************************************
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42 ** Message-digest routines: **
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43 ** To form the message digest for a message M **
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44 ** (1) Initialize a context buffer mdContext using MD5Init **
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45 ** (2) Call MD5Update on mdContext and M **
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46 ** (3) Call MD5Final on mdContext **
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47 ** The message digest is now in mdContext->digest[0...15] **
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48 ***********************************************************************
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51 /* forward declaration */
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52 static void Transform (u32_t *buf, u32_t *in);
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54 static unsigned char PADDING[64] = {
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55 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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56 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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57 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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58 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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59 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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60 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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61 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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62 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
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65 /* F, G, H and I are basic MD5 functions */
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66 #define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
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67 #define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
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68 #define H(x, y, z) ((x) ^ (y) ^ (z))
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69 #define I(x, y, z) ((y) ^ ((x) | (~z)))
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71 /* ROTATE_LEFT rotates x left n bits */
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72 #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
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74 /* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4 */
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75 /* Rotation is separate from addition to prevent recomputation */
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76 #define FF(a, b, c, d, x, s, ac) \
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77 {(a) += F ((b), (c), (d)) + (x) + (u32_t)(ac); \
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78 (a) = ROTATE_LEFT ((a), (s)); \
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81 #define GG(a, b, c, d, x, s, ac) \
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82 {(a) += G ((b), (c), (d)) + (x) + (u32_t)(ac); \
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83 (a) = ROTATE_LEFT ((a), (s)); \
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86 #define HH(a, b, c, d, x, s, ac) \
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87 {(a) += H ((b), (c), (d)) + (x) + (u32_t)(ac); \
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88 (a) = ROTATE_LEFT ((a), (s)); \
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91 #define II(a, b, c, d, x, s, ac) \
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92 {(a) += I ((b), (c), (d)) + (x) + (u32_t)(ac); \
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93 (a) = ROTATE_LEFT ((a), (s)); \
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101 #define UL(x) x##UL
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107 /* The routine MD5Init initializes the message-digest context
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108 mdContext. All fields are set to zero.
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110 void MD5Init (MD5_CTX *mdContext)
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112 mdContext->i[0] = mdContext->i[1] = (u32_t)0;
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114 /* Load magic initialization constants.
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116 mdContext->buf[0] = (u32_t)0x67452301UL;
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117 mdContext->buf[1] = (u32_t)0xefcdab89UL;
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118 mdContext->buf[2] = (u32_t)0x98badcfeUL;
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119 mdContext->buf[3] = (u32_t)0x10325476UL;
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122 /* The routine MD5Update updates the message-digest context to
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123 account for the presence of each of the characters inBuf[0..inLen-1]
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124 in the message whose digest is being computed.
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126 void MD5Update(MD5_CTX *mdContext, unsigned char *inBuf, unsigned int inLen)
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130 unsigned int i, ii;
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133 ppp_trace(LOG_INFO, "MD5Update: %u:%.*H\n", inLen, MIN(inLen, 20) * 2, inBuf);
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134 ppp_trace(LOG_INFO, "MD5Update: %u:%s\n", inLen, inBuf);
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137 /* compute number of bytes mod 64 */
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138 mdi = (int)((mdContext->i[0] >> 3) & 0x3F);
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140 /* update number of bits */
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141 if ((mdContext->i[0] + ((u32_t)inLen << 3)) < mdContext->i[0])
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143 mdContext->i[0] += ((u32_t)inLen << 3);
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144 mdContext->i[1] += ((u32_t)inLen >> 29);
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147 /* add new character to buffer, increment mdi */
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148 mdContext->in[mdi++] = *inBuf++;
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150 /* transform if necessary */
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152 for (i = 0, ii = 0; i < 16; i++, ii += 4)
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153 in[i] = (((u32_t)mdContext->in[ii+3]) << 24) |
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154 (((u32_t)mdContext->in[ii+2]) << 16) |
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155 (((u32_t)mdContext->in[ii+1]) << 8) |
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156 ((u32_t)mdContext->in[ii]);
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157 Transform (mdContext->buf, in);
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163 /* The routine MD5Final terminates the message-digest computation and
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164 ends with the desired message digest in mdContext->digest[0...15].
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166 void MD5Final (unsigned char hash[], MD5_CTX *mdContext)
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170 unsigned int i, ii;
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171 unsigned int padLen;
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173 /* save number of bits */
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174 in[14] = mdContext->i[0];
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175 in[15] = mdContext->i[1];
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177 /* compute number of bytes mod 64 */
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178 mdi = (int)((mdContext->i[0] >> 3) & 0x3F);
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180 /* pad out to 56 mod 64 */
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181 padLen = (mdi < 56) ? (56 - mdi) : (120 - mdi);
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182 MD5Update (mdContext, PADDING, padLen);
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184 /* append length in bits and transform */
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185 for (i = 0, ii = 0; i < 14; i++, ii += 4)
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186 in[i] = (((u32_t)mdContext->in[ii+3]) << 24) |
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187 (((u32_t)mdContext->in[ii+2]) << 16) |
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188 (((u32_t)mdContext->in[ii+1]) << 8) |
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189 ((u32_t)mdContext->in[ii]);
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190 Transform (mdContext->buf, in);
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192 /* store buffer in digest */
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193 for (i = 0, ii = 0; i < 4; i++, ii += 4) {
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194 mdContext->digest[ii] = (unsigned char)(mdContext->buf[i] & 0xFF);
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195 mdContext->digest[ii+1] =
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196 (unsigned char)((mdContext->buf[i] >> 8) & 0xFF);
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197 mdContext->digest[ii+2] =
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198 (unsigned char)((mdContext->buf[i] >> 16) & 0xFF);
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199 mdContext->digest[ii+3] =
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200 (unsigned char)((mdContext->buf[i] >> 24) & 0xFF);
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202 memcpy(hash, mdContext->digest, 16);
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205 /* Basic MD5 step. Transforms buf based on in.
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207 static void Transform (u32_t *buf, u32_t *in)
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209 u32_t a = buf[0], b = buf[1], c = buf[2], d = buf[3];
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216 FF ( a, b, c, d, in[ 0], S11, UL(3614090360)); /* 1 */
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217 FF ( d, a, b, c, in[ 1], S12, UL(3905402710)); /* 2 */
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218 FF ( c, d, a, b, in[ 2], S13, UL( 606105819)); /* 3 */
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219 FF ( b, c, d, a, in[ 3], S14, UL(3250441966)); /* 4 */
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220 FF ( a, b, c, d, in[ 4], S11, UL(4118548399)); /* 5 */
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221 FF ( d, a, b, c, in[ 5], S12, UL(1200080426)); /* 6 */
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222 FF ( c, d, a, b, in[ 6], S13, UL(2821735955)); /* 7 */
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223 FF ( b, c, d, a, in[ 7], S14, UL(4249261313)); /* 8 */
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224 FF ( a, b, c, d, in[ 8], S11, UL(1770035416)); /* 9 */
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225 FF ( d, a, b, c, in[ 9], S12, UL(2336552879)); /* 10 */
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226 FF ( c, d, a, b, in[10], S13, UL(4294925233)); /* 11 */
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227 FF ( b, c, d, a, in[11], S14, UL(2304563134)); /* 12 */
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228 FF ( a, b, c, d, in[12], S11, UL(1804603682)); /* 13 */
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229 FF ( d, a, b, c, in[13], S12, UL(4254626195)); /* 14 */
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230 FF ( c, d, a, b, in[14], S13, UL(2792965006)); /* 15 */
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231 FF ( b, c, d, a, in[15], S14, UL(1236535329)); /* 16 */
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238 GG ( a, b, c, d, in[ 1], S21, UL(4129170786)); /* 17 */
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239 GG ( d, a, b, c, in[ 6], S22, UL(3225465664)); /* 18 */
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240 GG ( c, d, a, b, in[11], S23, UL( 643717713)); /* 19 */
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241 GG ( b, c, d, a, in[ 0], S24, UL(3921069994)); /* 20 */
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242 GG ( a, b, c, d, in[ 5], S21, UL(3593408605)); /* 21 */
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243 GG ( d, a, b, c, in[10], S22, UL( 38016083)); /* 22 */
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244 GG ( c, d, a, b, in[15], S23, UL(3634488961)); /* 23 */
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245 GG ( b, c, d, a, in[ 4], S24, UL(3889429448)); /* 24 */
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246 GG ( a, b, c, d, in[ 9], S21, UL( 568446438)); /* 25 */
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247 GG ( d, a, b, c, in[14], S22, UL(3275163606)); /* 26 */
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248 GG ( c, d, a, b, in[ 3], S23, UL(4107603335)); /* 27 */
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249 GG ( b, c, d, a, in[ 8], S24, UL(1163531501)); /* 28 */
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250 GG ( a, b, c, d, in[13], S21, UL(2850285829)); /* 29 */
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251 GG ( d, a, b, c, in[ 2], S22, UL(4243563512)); /* 30 */
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252 GG ( c, d, a, b, in[ 7], S23, UL(1735328473)); /* 31 */
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253 GG ( b, c, d, a, in[12], S24, UL(2368359562)); /* 32 */
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260 HH ( a, b, c, d, in[ 5], S31, UL(4294588738)); /* 33 */
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261 HH ( d, a, b, c, in[ 8], S32, UL(2272392833)); /* 34 */
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262 HH ( c, d, a, b, in[11], S33, UL(1839030562)); /* 35 */
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263 HH ( b, c, d, a, in[14], S34, UL(4259657740)); /* 36 */
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264 HH ( a, b, c, d, in[ 1], S31, UL(2763975236)); /* 37 */
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265 HH ( d, a, b, c, in[ 4], S32, UL(1272893353)); /* 38 */
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266 HH ( c, d, a, b, in[ 7], S33, UL(4139469664)); /* 39 */
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267 HH ( b, c, d, a, in[10], S34, UL(3200236656)); /* 40 */
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268 HH ( a, b, c, d, in[13], S31, UL( 681279174)); /* 41 */
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269 HH ( d, a, b, c, in[ 0], S32, UL(3936430074)); /* 42 */
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270 HH ( c, d, a, b, in[ 3], S33, UL(3572445317)); /* 43 */
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271 HH ( b, c, d, a, in[ 6], S34, UL( 76029189)); /* 44 */
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272 HH ( a, b, c, d, in[ 9], S31, UL(3654602809)); /* 45 */
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273 HH ( d, a, b, c, in[12], S32, UL(3873151461)); /* 46 */
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274 HH ( c, d, a, b, in[15], S33, UL( 530742520)); /* 47 */
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275 HH ( b, c, d, a, in[ 2], S34, UL(3299628645)); /* 48 */
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282 II ( a, b, c, d, in[ 0], S41, UL(4096336452)); /* 49 */
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283 II ( d, a, b, c, in[ 7], S42, UL(1126891415)); /* 50 */
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284 II ( c, d, a, b, in[14], S43, UL(2878612391)); /* 51 */
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285 II ( b, c, d, a, in[ 5], S44, UL(4237533241)); /* 52 */
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286 II ( a, b, c, d, in[12], S41, UL(1700485571)); /* 53 */
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287 II ( d, a, b, c, in[ 3], S42, UL(2399980690)); /* 54 */
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288 II ( c, d, a, b, in[10], S43, UL(4293915773)); /* 55 */
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289 II ( b, c, d, a, in[ 1], S44, UL(2240044497)); /* 56 */
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290 II ( a, b, c, d, in[ 8], S41, UL(1873313359)); /* 57 */
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291 II ( d, a, b, c, in[15], S42, UL(4264355552)); /* 58 */
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292 II ( c, d, a, b, in[ 6], S43, UL(2734768916)); /* 59 */
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293 II ( b, c, d, a, in[13], S44, UL(1309151649)); /* 60 */
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294 II ( a, b, c, d, in[ 4], S41, UL(4149444226)); /* 61 */
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295 II ( d, a, b, c, in[11], S42, UL(3174756917)); /* 62 */
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296 II ( c, d, a, b, in[ 2], S43, UL( 718787259)); /* 63 */
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297 II ( b, c, d, a, in[ 9], S44, UL(3951481745)); /* 64 */
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