2 * md5.c -- md5 message digest algorithm
3 * taken from RFC-1321/Appendix A.3
7 * MD5C.C -- RSA Data Security, Inc., MD5 message-digest algorithm
11 * Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All
14 * License to copy and use this software is granted provided that it
15 * is identified as the "RSA Data Security, Inc. MD5 Message-Digest
16 * Algorithm" in all material mentioning or referencing this software
19 * License is also granted to make and use derivative works provided
20 * that such works are identified as "derived from the RSA Data
21 * Security, Inc. MD5 Message-Digest Algorithm" in all material
22 * mentioning or referencing the derived work.
24 * RSA Data Security, Inc. makes no representations concerning either
25 * the merchantability of this software or the suitability of this
26 * software for any particular purpose. It is provided "as is"
27 * without express or implied warranty of any kind.
29 * These notices must be retained in any copies of any part of this
30 * documentation and/or software.
36 * Constants for MD5Transform routine.
55 static void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
56 static void Encode PROTO_LIST ((unsigned char *, UINT4 *, unsigned int));
57 static void Decode PROTO_LIST ((UINT4 *, unsigned char *, unsigned int));
59 static unsigned char PADDING[64] = {
60 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
61 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
62 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
65 /* F, G, H and I are basic MD5 functions.
67 #define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
68 #define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
69 #define H(x, y, z) ((x) ^ (y) ^ (z))
70 #define I(x, y, z) ((y) ^ ((x) | (~z)))
72 /* ROTATE_LEFT rotates x left n bits.
74 #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
76 /* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
77 * Rotation is separate from addition to prevent recomputation.
79 #define FF(a, b, c, d, x, s, ac) { \
80 (a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \
81 (a) = ROTATE_LEFT ((a), (s)); \
84 #define GG(a, b, c, d, x, s, ac) { \
85 (a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \
86 (a) = ROTATE_LEFT ((a), (s)); \
89 #define HH(a, b, c, d, x, s, ac) { \
90 (a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \
91 (a) = ROTATE_LEFT ((a), (s)); \
94 #define II(a, b, c, d, x, s, ac) { \
95 (a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \
96 (a) = ROTATE_LEFT ((a), (s)); \
100 /* MD5 initialization. Begins an MD5 operation, writing a new context.
102 void MD5Init (context)
103 MD5_CTX *context; /* context */
105 context->count[0] = context->count[1] = 0;
106 /* Load magic initialization constants.
108 context->state[0] = 0x67452301;
109 context->state[1] = 0xefcdab89;
110 context->state[2] = 0x98badcfe;
111 context->state[3] = 0x10325476;
114 /* MD5 block update operation. Continues an MD5 message-digest
115 * operation, processing another message block, and updating the
118 void MD5Update (context, input, inputLen)
119 MD5_CTX *context; /* context */
120 unsigned char *input; /* input block */
121 unsigned int inputLen; /* length of input block */
123 unsigned int i, index, partLen;
125 /* Compute number of bytes mod 64 */
126 index = (unsigned int)((context->count[0] >> 3) & 0x3F);
128 /* Update number of bits */
129 if ((context->count[0] += ((UINT4)inputLen << 3)) < ((UINT4)inputLen << 3))
131 context->count[1] += ((UINT4)inputLen >> 29);
133 partLen = 64 - index;
135 /* Transform as many times as possible. */
136 if (inputLen >= partLen) {
137 memcpy ((POINTER)&context->buffer[index], (POINTER)input, partLen);
138 MD5Transform (context->state, context->buffer);
140 for (i = partLen; i + 63 < inputLen; i += 64)
141 MD5Transform (context->state, &input[i]);
147 /* Buffer remaining input */
148 memcpy ((POINTER)&context->buffer[index], (POINTER)&input[i], inputLen-i);
152 * MD5 finalization. Ends an MD5 message-digest operation, writing the
153 * the message digest and zeroizing the context.
155 void MD5Final (digest, context)
156 unsigned char digest[16]; /* message digest */
157 MD5_CTX *context; /* context */
159 unsigned char bits[8];
160 unsigned int index, padLen;
162 /* Save number of bits */
163 Encode (bits, context->count, 8);
165 /* Pad out to 56 mod 64.
167 index = (unsigned int)((context->count[0] >> 3) & 0x3f);
168 padLen = (index < 56) ? (56 - index) : (120 - index);
169 MD5Update (context, PADDING, padLen);
171 /* Append length (before padding) */
172 MD5Update (context, bits, 8);
173 /* Store state in digest */
174 Encode (digest, context->state, 16);
176 /* Zeroize sensitive information. */
177 memset ((POINTER)context, 0, sizeof(*context));
180 /* MD5 basic transformation. Transforms state based on block.
182 static void MD5Transform (state, block)
184 unsigned char block[64];
186 UINT4 a = state[0], b = state[1], c = state[2], d = state[3], x[16];
188 Decode (x, block, 64);
191 FF (a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */
192 FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */
193 FF (c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */
194 FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */
195 FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */
196 FF (d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */
197 FF (c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */
198 FF (b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */
199 FF (a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */
200 FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */
201 FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */
202 FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */
203 FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */
204 FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */
205 FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */
206 FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 */
209 GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */
210 GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */
211 GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */
212 GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */
213 GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */
214 GG (d, a, b, c, x[10], S22, 0x2441453); /* 22 */
215 GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */
216 GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */
217 GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */
218 GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */
219 GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */
220 GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */
221 GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */
222 GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */
223 GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */
224 GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */
227 HH (a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */
228 HH (d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */
229 HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */
230 HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */
231 HH (a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */
232 HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */
233 HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */
234 HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */
235 HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */
236 HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */
237 HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */
238 HH (b, c, d, a, x[ 6], S34, 0x4881d05); /* 44 */
239 HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */
240 HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */
241 HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */
242 HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */
245 II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */
246 II (d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */
247 II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */
248 II (b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */
249 II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */
250 II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */
251 II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */
252 II (b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */
253 II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */
254 II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */
255 II (c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */
256 II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */
257 II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */
258 II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */
259 II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */
260 II (b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */
267 /* Zeroize sensitive information. */
268 memset ((POINTER)x, 0, sizeof(x));
271 /* Encodes input (UINT4) into output (unsigned char). Assumes len is
274 static void Encode (output, input, len)
275 unsigned char *output;
281 for (i = 0, j = 0; j < len; i++, j += 4) {
282 output[j] = (unsigned char)(input[i] & 0xff);
283 output[j+1] = (unsigned char)((input[i] >> 8) & 0xff);
284 output[j+2] = (unsigned char)((input[i] >> 16) & 0xff);
285 output[j+3] = (unsigned char)((input[i] >> 24) & 0xff);
289 /* Decodes input (unsigned char) into output (UINT4). Assumes len is
292 static void Decode (output, input, len)
294 unsigned char *input;
299 for (i = 0, j = 0; j < len; i++, j += 4)
300 output[i] = ((UINT4)input[j]) | (((UINT4)input[j+1]) << 8) |
301 (((UINT4)input[j+2]) << 16) | (((UINT4)input[j+3]) << 24);