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trunk/third/nmh/uip/md5.c
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[12454] | 1 | |

2 | /* | |

3 | * md5.c -- md5 message digest algorithm | |

4 | * taken from RFC-1321/Appendix A.3 | |

5 | * | |

6 | * $Id: md5.c,v 1.1.1.1 1999-02-07 18:14:13 danw Exp $ | |

7 | */ | |

8 | ||

9 | /* | |

10 | * MD5C.C -- RSA Data Security, Inc., MD5 message-digest algorithm | |

11 | */ | |

12 | ||

13 | /* | |

14 | * Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All | |

15 | * rights reserved. | |

16 | * | |

17 | * License to copy and use this software is granted provided that it | |

18 | * is identified as the "RSA Data Security, Inc. MD5 Message-Digest | |

19 | * Algorithm" in all material mentioning or referencing this software | |

20 | * or this function. | |

21 | * | |

22 | * License is also granted to make and use derivative works provided | |

23 | * that such works are identified as "derived from the RSA Data | |

24 | * Security, Inc. MD5 Message-Digest Algorithm" in all material | |

25 | * mentioning or referencing the derived work. | |

26 | * | |

27 | * RSA Data Security, Inc. makes no representations concerning either | |

28 | * the merchantability of this software or the suitability of this | |

29 | * software for any particular purpose. It is provided "as is" | |

30 | * without express or implied warranty of any kind. | |

31 | * | |

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

33 | * documentation and/or software. | |

34 | */ | |

35 | ||

36 | #include <h/md5.h> | |

37 | ||

38 | /* | |

39 | * Constants for MD5Transform routine. | |

40 | */ | |

41 | #define S11 7 | |

42 | #define S12 12 | |

43 | #define S13 17 | |

44 | #define S14 22 | |

45 | #define S21 5 | |

46 | #define S22 9 | |

47 | #define S23 14 | |

48 | #define S24 20 | |

49 | #define S31 4 | |

50 | #define S32 11 | |

51 | #define S33 16 | |

52 | #define S34 23 | |

53 | #define S41 6 | |

54 | #define S42 10 | |

55 | #define S43 15 | |

56 | #define S44 21 | |

57 | ||

58 | static void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64])); | |

59 | static void Encode PROTO_LIST ((unsigned char *, UINT4 *, unsigned int)); | |

60 | static void Decode PROTO_LIST ((UINT4 *, unsigned char *, unsigned int)); | |

61 | ||

62 | static unsigned char PADDING[64] = { | |

63 | 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, | |

64 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, | |

65 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 | |

66 | }; | |

67 | ||

68 | /* F, G, H and I are basic MD5 functions. | |

69 | */ | |

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

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

72 | #define H(x, y, z) ((x) ^ (y) ^ (z)) | |

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

74 | ||

75 | /* ROTATE_LEFT rotates x left n bits. | |

76 | */ | |

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

78 | ||

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

80 | Rotation is separate from addition to prevent recomputation. | |

81 | */ | |

82 | #define FF(a, b, c, d, x, s, ac) { \ | |

83 | (a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \ | |

84 | (a) = ROTATE_LEFT ((a), (s)); \ | |

85 | (a) += (b); \ | |

86 | } | |

87 | #define GG(a, b, c, d, x, s, ac) { \ | |

88 | (a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \ | |

89 | (a) = ROTATE_LEFT ((a), (s)); \ | |

90 | (a) += (b); \ | |

91 | } | |

92 | #define HH(a, b, c, d, x, s, ac) { \ | |

93 | (a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \ | |

94 | (a) = ROTATE_LEFT ((a), (s)); \ | |

95 | (a) += (b); \ | |

96 | } | |

97 | #define II(a, b, c, d, x, s, ac) { \ | |

98 | (a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \ | |

99 | (a) = ROTATE_LEFT ((a), (s)); \ | |

100 | (a) += (b); \ | |

101 | } | |

102 | ||

103 | /* MD5 initialization. Begins an MD5 operation, writing a new context. | |

104 | */ | |

105 | void MD5Init (context) | |

106 | MD5_CTX *context; /* context */ | |

107 | { | |

108 | context->count[0] = context->count[1] = 0; | |

109 | /* Load magic initialization constants. | |

110 | */ | |

111 | context->state[0] = 0x67452301; | |

112 | context->state[1] = 0xefcdab89; | |

113 | context->state[2] = 0x98badcfe; | |

114 | context->state[3] = 0x10325476; | |

115 | } | |

116 | ||

117 | /* MD5 block update operation. Continues an MD5 message-digest | |

118 | operation, processing another message block, and updating the | |

119 | context. | |

120 | */ | |

121 | void MD5Update (context, input, inputLen) | |

122 | MD5_CTX *context; /* context */ | |

123 | unsigned char *input; /* input block */ | |

124 | unsigned int inputLen; /* length of input block */ | |

125 | { | |

126 | unsigned int i, index, partLen; | |

127 | ||

128 | /* Compute number of bytes mod 64 */ | |

129 | index = (unsigned int)((context->count[0] >> 3) & 0x3F); | |

130 | ||

131 | /* Update number of bits */ | |

132 | if ((context->count[0] += ((UINT4)inputLen << 3)) | |

133 | < ((UINT4)inputLen << 3)) | |

134 | context->count[1]++; | |

135 | context->count[1] += ((UINT4)inputLen >> 29); | |

136 | ||

137 | partLen = 64 - index; | |

138 | ||

139 | /* Transform as many times as possible. */ | |

140 | if (inputLen >= partLen) { | |

141 | memcpy ((POINTER)&context->buffer[index], (POINTER)input, partLen); | |

142 | MD5Transform (context->state, context->buffer); | |

143 | ||

144 | for (i = partLen; i + 63 < inputLen; i += 64) | |

145 | MD5Transform (context->state, &input[i]); | |

146 | ||

147 | index = 0; | |

148 | } | |

149 | else | |

150 | i = 0; | |

151 | ||

152 | /* Buffer remaining input */ | |

153 | memcpy ((POINTER)&context->buffer[index], (POINTER)&input[i], inputLen-i); | |

154 | } | |

155 | ||

156 | /* | |

157 | * MD5 finalization. Ends an MD5 message-digest operation, writing the | |

158 | * the message digest and zeroizing the context. | |

159 | */ | |

160 | void MD5Final (digest, context) | |

161 | unsigned char digest[16]; /* message digest */ | |

162 | MD5_CTX *context; /* context */ | |

163 | { | |

164 | unsigned char bits[8]; | |

165 | unsigned int index, padLen; | |

166 | ||

167 | /* Save number of bits */ | |

168 | Encode (bits, context->count, 8); | |

169 | ||

170 | /* Pad out to 56 mod 64. | |

171 | */ | |

172 | index = (unsigned int)((context->count[0] >> 3) & 0x3f); | |

173 | padLen = (index < 56) ? (56 - index) : (120 - index); | |

174 | MD5Update (context, PADDING, padLen); | |

175 | ||

176 | /* Append length (before padding) */ | |

177 | MD5Update (context, bits, 8); | |

178 | /* Store state in digest */ | |

179 | Encode (digest, context->state, 16); | |

180 | ||

181 | /* Zeroize sensitive information. */ | |

182 | memset ((POINTER)context, 0, sizeof(*context)); | |

183 | } | |

184 | ||

185 | /* MD5 basic transformation. Transforms state based on block. | |

186 | */ | |

187 | static void MD5Transform (state, block) | |

188 | UINT4 state[4]; | |

189 | unsigned char block[64]; | |

190 | { | |

191 | UINT4 a = state[0], b = state[1], c = state[2], d = state[3], x[16]; | |

192 | ||

193 | Decode (x, block, 64); | |

194 | ||

195 | /* Round 1 */ | |

196 | FF (a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */ | |

197 | FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */ | |

198 | FF (c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */ | |

199 | FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */ | |

200 | FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */ | |

201 | FF (d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */ | |

202 | FF (c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */ | |

203 | FF (b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */ | |

204 | FF (a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */ | |

205 | FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */ | |

206 | FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */ | |

207 | FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */ | |

208 | FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */ | |

209 | FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */ | |

210 | FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */ | |

211 | FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 */ | |

212 | ||

213 | /* Round 2 */ | |

214 | GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */ | |

215 | GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */ | |

216 | GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */ | |

217 | GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */ | |

218 | GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */ | |

219 | GG (d, a, b, c, x[10], S22, 0x2441453); /* 22 */ | |

220 | GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */ | |

221 | GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */ | |

222 | GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */ | |

223 | GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */ | |

224 | GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */ | |

225 | GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */ | |

226 | GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */ | |

227 | GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */ | |

228 | GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */ | |

229 | GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */ | |

230 | ||

231 | /* Round 3 */ | |

232 | HH (a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */ | |

233 | HH (d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */ | |

234 | HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */ | |

235 | HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */ | |

236 | HH (a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */ | |

237 | HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */ | |

238 | HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */ | |

239 | HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */ | |

240 | HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */ | |

241 | HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */ | |

242 | HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */ | |

243 | HH (b, c, d, a, x[ 6], S34, 0x4881d05); /* 44 */ | |

244 | HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */ | |

245 | HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */ | |

246 | HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */ | |

247 | HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */ | |

248 | ||

249 | /* Round 4 */ | |

250 | II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */ | |

251 | II (d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */ | |

252 | II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */ | |

253 | II (b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */ | |

254 | II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */ | |

255 | II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */ | |

256 | II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */ | |

257 | II (b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */ | |

258 | II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */ | |

259 | II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */ | |

260 | II (c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */ | |

261 | II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */ | |

262 | II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */ | |

263 | II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */ | |

264 | II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */ | |

265 | II (b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */ | |

266 | ||

267 | state[0] += a; | |

268 | state[1] += b; | |

269 | state[2] += c; | |

270 | state[3] += d; | |

271 | ||

272 | /* Zeroize sensitive information. */ | |

273 | memset ((POINTER)x, 0, sizeof(x)); | |

274 | } | |

275 | ||

276 | /* Encodes input (UINT4) into output (unsigned char). Assumes len is | |

277 | a multiple of 4. | |

278 | */ | |

279 | static void Encode (output, input, len) | |

280 | unsigned char *output; | |

281 | UINT4 *input; | |

282 | unsigned int len; | |

283 | { | |

284 | unsigned int i, j; | |

285 | ||

286 | for (i = 0, j = 0; j < len; i++, j += 4) { | |

287 | output[j] = (unsigned char)(input[i] & 0xff); | |

288 | output[j+1] = (unsigned char)((input[i] >> 8) & 0xff); | |

289 | output[j+2] = (unsigned char)((input[i] >> 16) & 0xff); | |

290 | output[j+3] = (unsigned char)((input[i] >> 24) & 0xff); | |

291 | } | |

292 | } | |

293 | ||

294 | /* Decodes input (unsigned char) into output (UINT4). Assumes len is | |

295 | a multiple of 4. | |

296 | */ | |

297 | static void Decode (output, input, len) | |

298 | UINT4 *output; | |

299 | unsigned char *input; | |

300 | unsigned int len; | |

301 | { | |

302 | unsigned int i, j; | |

303 | ||

304 | for (i = 0, j = 0; j < len; i++, j += 4) | |

305 | output[i] = ((UINT4)input[j]) | (((UINT4)input[j+1]) << 8) | | |

306 | (((UINT4)input[j+2]) << 16) | (((UINT4)input[j+3]) << 24); | |

307 | } | |

308 |

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