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1 /*

2 ***********************************************************************

3 ** md5.c -- the source code for MD5 routines **

4 ** RSA Data Security, Inc. MD5 Message-Digest Algorithm **

5 ** Created: 2/17/90 RLR **

6 ** Revised: 1/91 SRD,AJ,BSK,JT Reference C ver., 7/10 constant corr. **

7 ***********************************************************************

8 */

10 /*

11 ***********************************************************************

13 ** **

14 ** License to copy and use this software is granted provided that **

15 ** it is identified as the "RSA Data Security, Inc. MD5 Message- **

16 ** Digest Algorithm" in all material mentioning or referencing this **

17 ** software or this function. **

18 ** **

19 ** License is also granted to make and use derivative works **

20 ** provided that such works are identified as "derived from the RSA **

21 ** Data Security, Inc. MD5 Message-Digest Algorithm" in all **

22 ** material mentioning or referencing the derived work. **

23 ** **

24 ** RSA Data Security, Inc. makes no representations concerning **

25 ** either the merchantability of this software or the suitability **

26 ** of this software for any particular purpose. It is provided "as **

27 ** is" without express or implied warranty of any kind. **

28 ** **

29 ** These notices must be retained in any copies of any part of this **

30 ** documentation and/or software. **

31 ***********************************************************************

32 */

34 #include "lwip/opt.h"

36 #if PPP_SUPPORT /* don't build if not configured for use in lwipopts.h */

38 #if CHAP_SUPPORT || MD5_SUPPORT

40 #include "ppp.h"

41 #include "pppdebug.h"

43 #include "md5.h"

45 /*

46 ***********************************************************************

47 ** Message-digest routines: **

48 ** To form the message digest for a message M **

49 ** (1) Initialize a context buffer mdContext using MD5Init **

50 ** (2) Call MD5Update on mdContext and M **

51 ** (3) Call MD5Final on mdContext **

52 ** The message digest is now in mdContext->digest[0...15] **

53 ***********************************************************************

54 */

56 /* forward declaration */

57 static void Transform (u32_t *buf, u32_t *in);

59 static unsigned char PADDING[64] = {

60 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,

61 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,

62 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,

63 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,

64 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,

65 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,

66 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,

67 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00

68 };

70 /* F, G, H and I are basic MD5 functions */

71 #define F(x, y, z) (((x) & (y)) | ((~x) & (z)))

72 #define G(x, y, z) (((x) & (z)) | ((y) & (~z)))

73 #define H(x, y, z) ((x) ^ (y) ^ (z))

74 #define I(x, y, z) ((y) ^ ((x) | (~z)))

76 /* ROTATE_LEFT rotates x left n bits */

77 #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))

79 /* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4 */

80 /* Rotation is separate from addition to prevent recomputation */

81 #define FF(a, b, c, d, x, s, ac) \

82 {(a) += F ((b), (c), (d)) + (x) + (u32_t)(ac); \

83 (a) = ROTATE_LEFT ((a), (s)); \

84 (a) += (b); \

85 }

86 #define GG(a, b, c, d, x, s, ac) \

87 {(a) += G ((b), (c), (d)) + (x) + (u32_t)(ac); \

88 (a) = ROTATE_LEFT ((a), (s)); \

89 (a) += (b); \

90 }

91 #define HH(a, b, c, d, x, s, ac) \

92 {(a) += H ((b), (c), (d)) + (x) + (u32_t)(ac); \

93 (a) = ROTATE_LEFT ((a), (s)); \

94 (a) += (b); \

95 }

96 #define II(a, b, c, d, x, s, ac) \

97 {(a) += I ((b), (c), (d)) + (x) + (u32_t)(ac); \

98 (a) = ROTATE_LEFT ((a), (s)); \

99 (a) += (b); \

100 }

101

102 #ifdef __STDC__

103 #define UL(x) x##UL

104 #else

105 #ifdef WIN32

106 #define UL(x) x##UL

107 #else

108 #define UL(x) x

109 #endif

110 #endif

111

112 /* The routine MD5Init initializes the message-digest context

113 mdContext. All fields are set to zero.

114 */

115 void

116 MD5Init (MD5_CTX *mdContext)

117 {

118 mdContext->i[0] = mdContext->i[1] = (u32_t)0;

119

120 /* Load magic initialization constants. */

121 mdContext->buf[0] = (u32_t)0x67452301UL;

122 mdContext->buf[1] = (u32_t)0xefcdab89UL;

123 mdContext->buf[2] = (u32_t)0x98badcfeUL;

124 mdContext->buf[3] = (u32_t)0x10325476UL;

125 }

126

127 /* The routine MD5Update updates the message-digest context to

128 account for the presence of each of the characters inBuf[0..inLen-1]

129 in the message whose digest is being computed.

130 */

131 void

132 MD5Update(MD5_CTX *mdContext, unsigned char *inBuf, unsigned int inLen)

133 {

134 u32_t in[16];

135 int mdi;

136 unsigned int i, ii;

137

138 #if 0

139 ppp_trace(LOG_INFO, "MD5Update: %u:%.*H\n", inLen, MIN(inLen, 20) * 2, inBuf);

140 ppp_trace(LOG_INFO, "MD5Update: %u:%s\n", inLen, inBuf);

141 #endif

142

143 /* compute number of bytes mod 64 */

144 mdi = (int)((mdContext->i[0] >> 3) & 0x3F);

145

146 /* update number of bits */

147 if ((mdContext->i[0] + ((u32_t)inLen << 3)) < mdContext->i[0]) {

148 mdContext->i[1]++;

149 }

150 mdContext->i[0] += ((u32_t)inLen << 3);

151 mdContext->i[1] += ((u32_t)inLen >> 29);

152

153 while (inLen--) {

154 /* add new character to buffer, increment mdi */

155 mdContext->in[mdi++] = *inBuf++;

156

157 /* transform if necessary */

158 if (mdi == 0x40) {

159 for (i = 0, ii = 0; i < 16; i++, ii += 4) {

160 in[i] = (((u32_t)mdContext->in[ii+3]) << 24) |

161 (((u32_t)mdContext->in[ii+2]) << 16) |

162 (((u32_t)mdContext->in[ii+1]) << 8) |

163 ((u32_t)mdContext->in[ii]);

164 }

165 Transform (mdContext->buf, in);

166 mdi = 0;

167 }

168 }

169 }

170

171 /* The routine MD5Final terminates the message-digest computation and

172 ends with the desired message digest in mdContext->digest[0...15].

173 */

174 void

175 MD5Final (unsigned char hash[], MD5_CTX *mdContext)

176 {

177 u32_t in[16];

178 int mdi;

179 unsigned int i, ii;

180 unsigned int padLen;

181

182 /* save number of bits */

183 in[14] = mdContext->i[0];

184 in[15] = mdContext->i[1];

185

186 /* compute number of bytes mod 64 */

187 mdi = (int)((mdContext->i[0] >> 3) & 0x3F);

188

189 /* pad out to 56 mod 64 */

190 padLen = (mdi < 56) ? (56 - mdi) : (120 - mdi);

191 MD5Update (mdContext, PADDING, padLen);

192

193 /* append length in bits and transform */

194 for (i = 0, ii = 0; i < 14; i++, ii += 4) {

195 in[i] = (((u32_t)mdContext->in[ii+3]) << 24) |

196 (((u32_t)mdContext->in[ii+2]) << 16) |

197 (((u32_t)mdContext->in[ii+1]) << 8) |

198 ((u32_t)mdContext->in[ii]);

199 }

200 Transform (mdContext->buf, in);

201

202 /* store buffer in digest */

203 for (i = 0, ii = 0; i < 4; i++, ii += 4) {

204 mdContext->digest[ii] = (unsigned char)(mdContext->buf[i] & 0xFF);

205 mdContext->digest[ii+1] =

206 (unsigned char)((mdContext->buf[i] >> 8) & 0xFF);

207 mdContext->digest[ii+2] =

208 (unsigned char)((mdContext->buf[i] >> 16) & 0xFF);

209 mdContext->digest[ii+3] =

210 (unsigned char)((mdContext->buf[i] >> 24) & 0xFF);

211 }

212 SMEMCPY(hash, mdContext->digest, 16);

213 }

214

215 /* Basic MD5 step. Transforms buf based on in.

216 */

217 static void

218 Transform (u32_t *buf, u32_t *in)

219 {

220 u32_t a = buf[0], b = buf[1], c = buf[2], d = buf[3];

221

222 /* Round 1 */

223 #define S11 7

224 #define S12 12

225 #define S13 17

226 #define S14 22

227 FF ( a, b, c, d, in[ 0], S11, UL(3614090360)); /* 1 */

228 FF ( d, a, b, c, in[ 1], S12, UL(3905402710)); /* 2 */

229 FF ( c, d, a, b, in[ 2], S13, UL( 606105819)); /* 3 */

230 FF ( b, c, d, a, in[ 3], S14, UL(3250441966)); /* 4 */

231 FF ( a, b, c, d, in[ 4], S11, UL(4118548399)); /* 5 */

232 FF ( d, a, b, c, in[ 5], S12, UL(1200080426)); /* 6 */

233 FF ( c, d, a, b, in[ 6], S13, UL(2821735955)); /* 7 */

234 FF ( b, c, d, a, in[ 7], S14, UL(4249261313)); /* 8 */

235 FF ( a, b, c, d, in[ 8], S11, UL(1770035416)); /* 9 */

236 FF ( d, a, b, c, in[ 9], S12, UL(2336552879)); /* 10 */

237 FF ( c, d, a, b, in[10], S13, UL(4294925233)); /* 11 */

238 FF ( b, c, d, a, in[11], S14, UL(2304563134)); /* 12 */

239 FF ( a, b, c, d, in[12], S11, UL(1804603682)); /* 13 */

240 FF ( d, a, b, c, in[13], S12, UL(4254626195)); /* 14 */

241 FF ( c, d, a, b, in[14], S13, UL(2792965006)); /* 15 */

242 FF ( b, c, d, a, in[15], S14, UL(1236535329)); /* 16 */

243

244 /* Round 2 */

245 #define S21 5

246 #define S22 9

247 #define S23 14

248 #define S24 20

249 GG ( a, b, c, d, in[ 1], S21, UL(4129170786)); /* 17 */

250 GG ( d, a, b, c, in[ 6], S22, UL(3225465664)); /* 18 */

251 GG ( c, d, a, b, in[11], S23, UL( 643717713)); /* 19 */

252 GG ( b, c, d, a, in[ 0], S24, UL(3921069994)); /* 20 */

253 GG ( a, b, c, d, in[ 5], S21, UL(3593408605)); /* 21 */

254 GG ( d, a, b, c, in[10], S22, UL( 38016083)); /* 22 */

255 GG ( c, d, a, b, in[15], S23, UL(3634488961)); /* 23 */

256 GG ( b, c, d, a, in[ 4], S24, UL(3889429448)); /* 24 */

257 GG ( a, b, c, d, in[ 9], S21, UL( 568446438)); /* 25 */

258 GG ( d, a, b, c, in[14], S22, UL(3275163606)); /* 26 */

259 GG ( c, d, a, b, in[ 3], S23, UL(4107603335)); /* 27 */

260 GG ( b, c, d, a, in[ 8], S24, UL(1163531501)); /* 28 */

261 GG ( a, b, c, d, in[13], S21, UL(2850285829)); /* 29 */

262 GG ( d, a, b, c, in[ 2], S22, UL(4243563512)); /* 30 */

263 GG ( c, d, a, b, in[ 7], S23, UL(1735328473)); /* 31 */

264 GG ( b, c, d, a, in[12], S24, UL(2368359562)); /* 32 */

265

266 /* Round 3 */

267 #define S31 4

268 #define S32 11

269 #define S33 16

270 #define S34 23

271 HH ( a, b, c, d, in[ 5], S31, UL(4294588738)); /* 33 */

272 HH ( d, a, b, c, in[ 8], S32, UL(2272392833)); /* 34 */

273 HH ( c, d, a, b, in[11], S33, UL(1839030562)); /* 35 */

274 HH ( b, c, d, a, in[14], S34, UL(4259657740)); /* 36 */

275 HH ( a, b, c, d, in[ 1], S31, UL(2763975236)); /* 37 */

276 HH ( d, a, b, c, in[ 4], S32, UL(1272893353)); /* 38 */

277 HH ( c, d, a, b, in[ 7], S33, UL(4139469664)); /* 39 */

278 HH ( b, c, d, a, in[10], S34, UL(3200236656)); /* 40 */

279 HH ( a, b, c, d, in[13], S31, UL( 681279174)); /* 41 */

280 HH ( d, a, b, c, in[ 0], S32, UL(3936430074)); /* 42 */

281 HH ( c, d, a, b, in[ 3], S33, UL(3572445317)); /* 43 */

282 HH ( b, c, d, a, in[ 6], S34, UL( 76029189)); /* 44 */

283 HH ( a, b, c, d, in[ 9], S31, UL(3654602809)); /* 45 */

284 HH ( d, a, b, c, in[12], S32, UL(3873151461)); /* 46 */

285 HH ( c, d, a, b, in[15], S33, UL( 530742520)); /* 47 */

286 HH ( b, c, d, a, in[ 2], S34, UL(3299628645)); /* 48 */

287

288 /* Round 4 */

289 #define S41 6

290 #define S42 10

291 #define S43 15

292 #define S44 21

293 II ( a, b, c, d, in[ 0], S41, UL(4096336452)); /* 49 */

294 II ( d, a, b, c, in[ 7], S42, UL(1126891415)); /* 50 */

295 II ( c, d, a, b, in[14], S43, UL(2878612391)); /* 51 */

296 II ( b, c, d, a, in[ 5], S44, UL(4237533241)); /* 52 */

297 II ( a, b, c, d, in[12], S41, UL(1700485571)); /* 53 */

298 II ( d, a, b, c, in[ 3], S42, UL(2399980690)); /* 54 */

299 II ( c, d, a, b, in[10], S43, UL(4293915773)); /* 55 */

300 II ( b, c, d, a, in[ 1], S44, UL(2240044497)); /* 56 */

301 II ( a, b, c, d, in[ 8], S41, UL(1873313359)); /* 57 */

302 II ( d, a, b, c, in[15], S42, UL(4264355552)); /* 58 */

303 II ( c, d, a, b, in[ 6], S43, UL(2734768916)); /* 59 */

304 II ( b, c, d, a, in[13], S44, UL(1309151649)); /* 60 */

305 II ( a, b, c, d, in[ 4], S41, UL(4149444226)); /* 61 */

306 II ( d, a, b, c, in[11], S42, UL(3174756917)); /* 62 */

307 II ( c, d, a, b, in[ 2], S43, UL( 718787259)); /* 63 */

308 II ( b, c, d, a, in[ 9], S44, UL(3951481745)); /* 64 */

309

310 buf[0] += a;

311 buf[1] += b;

312 buf[2] += c;

313 buf[3] += d;

314 }

315

316 #endif /* CHAP_SUPPORT || MD5_SUPPORT */

317

318 #endif /* PPP_SUPPORT */