2 static char md5ident[]="@(#)$Id: md5.c,v 1.4 1992/10/26 16:48:02 jromine Exp $";
4 /* taken from RFC-1321/Appendix A.3 */
6 /* MD5C.C - RSA Data Security, Inc., MD5 message-digest algorithm
9 /* Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All
12 License to copy and use this software is granted provided that it
13 is identified as the "RSA Data Security, Inc. MD5 Message-Digest
14 Algorithm" in all material mentioning or referencing this software
17 License is also granted to make and use derivative works provided
18 that such works are identified as "derived from the RSA Data
19 Security, Inc. MD5 Message-Digest Algorithm" in all material
20 mentioning or referencing the derived work.
22 RSA Data Security, Inc. makes no representations concerning either
23 the merchantability of this software or the suitability of this
24 software for any particular purpose. It is provided "as is"
25 without express or implied warranty of any kind.
27 These notices must be retained in any copies of any part of this
28 documentation and/or software.
31 /* #include "global.h" */
34 /* Constants for MD5Transform routine.
53 static void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
54 static void Encode PROTO_LIST
55 ((unsigned char *, UINT4 *, unsigned int));
56 static void Decode PROTO_LIST
57 ((UINT4 *, unsigned char *, unsigned int));
58 static void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
59 static void MD5_memset PROTO_LIST ((POINTER, int, unsigned int));
61 static unsigned char PADDING[64] = {
62 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
63 0, 0, 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
67 /* F, G, H and I are basic MD5 functions.
69 #define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
70 #define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
71 #define H(x, y, z) ((x) ^ (y) ^ (z))
72 #define I(x, y, z) ((y) ^ ((x) | (~z)))
74 /* ROTATE_LEFT rotates x left n bits.
76 #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
78 /* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
79 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) + (UINT4)(ac); \
83 (a) = ROTATE_LEFT ((a), (s)); \
86 #define GG(a, b, c, d, x, s, ac) { \
87 (a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \
88 (a) = ROTATE_LEFT ((a), (s)); \
91 #define HH(a, b, c, d, x, s, ac) { \
92 (a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \
93 (a) = ROTATE_LEFT ((a), (s)); \
96 #define II(a, b, c, d, x, s, ac) { \
97 (a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \
98 (a) = ROTATE_LEFT ((a), (s)); \
102 /* MD5 initialization. Begins an MD5 operation, writing a new context.
104 void MD5Init (context)
105 MD5_CTX *context; /* context */
107 context->count[0] = context->count[1] = 0;
108 /* Load magic initialization constants.
110 context->state[0] = 0x67452301;
111 context->state[1] = 0xefcdab89;
112 context->state[2] = 0x98badcfe;
113 context->state[3] = 0x10325476;
116 /* MD5 block update operation. Continues an MD5 message-digest
117 operation, processing another message block, and updating the
120 void MD5Update (context, input, inputLen)
121 MD5_CTX *context; /* context */
122 unsigned char *input; /* input block */
123 unsigned int inputLen; /* length of input block */
125 unsigned int i, index, partLen;
127 /* Compute number of bytes mod 64 */
128 index = (unsigned int)((context->count[0] >> 3) & 0x3F);
130 /* Update number of bits */
131 if ((context->count[0] += ((UINT4)inputLen << 3))
132 < ((UINT4)inputLen << 3))
134 context->count[1] += ((UINT4)inputLen >> 29);
136 partLen = 64 - index;
138 /* Transform as many times as possible.
140 if (inputLen >= partLen) {
142 ((POINTER)&context->buffer[index], (POINTER)input, partLen);
143 MD5Transform (context->state, context->buffer);
145 for (i = partLen; i + 63 < inputLen; i += 64)
146 MD5Transform (context->state, &input[i]);
153 /* Buffer remaining input */
155 ((POINTER)&context->buffer[index], (POINTER)&input[i],
159 /* MD5 finalization. Ends an MD5 message-digest operation, writing the
160 the message digest and zeroizing the context.
162 void MD5Final (digest, context)
163 unsigned char digest[16]; /* message digest */
164 MD5_CTX *context; /* context */
166 unsigned char bits[8];
167 unsigned int index, padLen;
169 /* Save number of bits */
170 Encode (bits, context->count, 8);
172 /* Pad out to 56 mod 64.
174 index = (unsigned int)((context->count[0] >> 3) & 0x3f);
175 padLen = (index < 56) ? (56 - index) : (120 - index);
176 MD5Update (context, PADDING, padLen);
178 /* Append length (before padding) */
179 MD5Update (context, bits, 8);
180 /* Store state in digest */
181 Encode (digest, context->state, 16);
183 /* Zeroize sensitive information.
185 MD5_memset ((POINTER)context, 0, sizeof (*context));
188 /* MD5 basic transformation. Transforms state based on block.
190 static void MD5Transform (state, block)
192 unsigned char block[64];
194 UINT4 a = state[0], b = state[1], c = state[2], d = state[3], x[16];
196 Decode (x, block, 64);
199 FF (a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */
200 FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */
201 FF (c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */
202 FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */
203 FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */
204 FF (d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */
205 FF (c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */
206 FF (b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */
207 FF (a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */
208 FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */
209 FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */
210 FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */
211 FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */
212 FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */
213 FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */
214 FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 */
217 GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */
218 GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */
219 GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */
220 GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */
221 GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */
222 GG (d, a, b, c, x[10], S22, 0x2441453); /* 22 */
223 GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */
224 GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */
225 GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */
226 GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */
227 GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */
228 GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */
229 GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */
230 GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */
231 GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */
232 GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */
235 HH (a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */
236 HH (d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */
237 HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */
238 HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */
239 HH (a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */
240 HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */
241 HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */
242 HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */
243 HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */
244 HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */
245 HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */
246 HH (b, c, d, a, x[ 6], S34, 0x4881d05); /* 44 */
247 HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */
248 HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */
249 HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */
250 HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */
253 II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */
254 II (d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */
255 II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */
256 II (b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */
257 II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */
258 II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */
259 II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */
260 II (b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */
261 II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */
262 II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */
263 II (c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */
264 II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */
265 II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */
266 II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */
267 II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */
268 II (b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */
275 /* Zeroize sensitive information.
277 MD5_memset ((POINTER)x, 0, sizeof (x));
280 /* Encodes input (UINT4) into output (unsigned char). Assumes len is
283 static void Encode (output, input, len)
284 unsigned char *output;
290 for (i = 0, j = 0; j < len; i++, j += 4) {
291 output[j] = (unsigned char)(input[i] & 0xff);
292 output[j+1] = (unsigned char)((input[i] >> 8) & 0xff);
293 output[j+2] = (unsigned char)((input[i] >> 16) & 0xff);
294 output[j+3] = (unsigned char)((input[i] >> 24) & 0xff);
298 /* Decodes input (unsigned char) into output (UINT4). Assumes len is
301 static void Decode (output, input, len)
303 unsigned char *input;
308 for (i = 0, j = 0; j < len; i++, j += 4)
309 output[i] = ((UINT4)input[j]) | (((UINT4)input[j+1]) << 8) |
310 (((UINT4)input[j+2]) << 16) | (((UINT4)input[j+3]) << 24);
313 /* Note: Replace "for loop" with standard memcpy if possible.
316 static void MD5_memcpy (output, input, len)
323 for (i = 0; i < len; i++)
324 output[i] = input[i];
327 /* Note: Replace "for loop" with standard memset if possible.
329 static void MD5_memset (output, value, len)
336 for (i = 0; i < len; i++)
337 ((char *)output)[i] = (char)value;