3 * md5.c -- md5 message digest algorithm
4 * taken from RFC-1321/Appendix A.3
10 * MD5C.C -- RSA Data Security, Inc., MD5 message-digest algorithm
14 * Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All
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
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.
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.
32 * These notices must be retained in any copies of any part of this
33 * documentation and/or software.
39 * Constants for MD5Transform routine.
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));
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
68 /* F, G, H and I are basic MD5 functions.
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)))
75 /* 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.
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)); \
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)); \
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)); \
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)); \
103 /* MD5 initialization. Begins an MD5 operation, writing a new context.
105 void MD5Init (context)
106 MD5_CTX *context; /* context */
108 context->count[0] = context->count[1] = 0;
109 /* Load magic initialization constants.
111 context->state[0] = 0x67452301;
112 context->state[1] = 0xefcdab89;
113 context->state[2] = 0x98badcfe;
114 context->state[3] = 0x10325476;
117 /* MD5 block update operation. Continues an MD5 message-digest
118 operation, processing another message block, and updating the
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 */
126 unsigned int i, index, partLen;
128 /* Compute number of bytes mod 64 */
129 index = (unsigned int)((context->count[0] >> 3) & 0x3F);
131 /* Update number of bits */
132 if ((context->count[0] += ((UINT4)inputLen << 3))
133 < ((UINT4)inputLen << 3))
135 context->count[1] += ((UINT4)inputLen >> 29);
137 partLen = 64 - index;
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);
144 for (i = partLen; i + 63 < inputLen; i += 64)
145 MD5Transform (context->state, &input[i]);
152 /* Buffer remaining input */
153 memcpy ((POINTER)&context->buffer[index], (POINTER)&input[i], inputLen-i);
157 * MD5 finalization. Ends an MD5 message-digest operation, writing the
158 * the message digest and zeroizing the context.
160 void MD5Final (digest, context)
161 unsigned char digest[16]; /* message digest */
162 MD5_CTX *context; /* context */
164 unsigned char bits[8];
165 unsigned int index, padLen;
167 /* Save number of bits */
168 Encode (bits, context->count, 8);
170 /* Pad out to 56 mod 64.
172 index = (unsigned int)((context->count[0] >> 3) & 0x3f);
173 padLen = (index < 56) ? (56 - index) : (120 - index);
174 MD5Update (context, PADDING, padLen);
176 /* Append length (before padding) */
177 MD5Update (context, bits, 8);
178 /* Store state in digest */
179 Encode (digest, context->state, 16);
181 /* Zeroize sensitive information. */
182 memset ((POINTER)context, 0, sizeof(*context));
185 /* MD5 basic transformation. Transforms state based on block.
187 static void MD5Transform (state, block)
189 unsigned char block[64];
191 UINT4 a = state[0], b = state[1], c = state[2], d = state[3], x[16];
193 Decode (x, block, 64);
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 */
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 */
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 */
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 */
272 /* Zeroize sensitive information. */
273 memset ((POINTER)x, 0, sizeof(x));
276 /* Encodes input (UINT4) into output (unsigned char). Assumes len is
279 static void Encode (output, input, len)
280 unsigned char *output;
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);
294 /* Decodes input (unsigned char) into output (UINT4). Assumes len is
297 static void Decode (output, input, len)
299 unsigned char *input;
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);