1 /*
2 * This is the C++ implementation of the MD5 Message-Digest
3 * Algorithm desrcipted in RFC 1321.
4 * I translated the C code from this RFC to C++.
5 * There is now warranty.
6 *
7 * Feb. 12. 2005
8 * Benjamin Grüdelbach
9 */
10
11 /*
12 * Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All
13 * rights reserved.
14 *
15 * License to copy and use this software is granted provided that it
16 * is identified as the "RSA Data Security, Inc. MD5 Message-Digest
17 * Algorithm" in all material mentioning or referencing this software
18 * or this function.
19 *
20 * License is also granted to make and use derivative works provided
21 * that such works are identified as "derived from the RSA Data
22 * Security, Inc. MD5 Message-Digest Algorithm" in all material
23 * mentioning or referencing the derived work.
24 *
25 * RSA Data Security, Inc. makes no representations concerning either
26 * the merchantability of this software or the suitability of this
27 * software for any particular purpose. It is provided "as is"
28 * without express or implied warranty of any kind.
29 *
30 * These notices must be retained in any copies of any part of this
31 * documentation and/or software.
32 */
33
34 #include <rudiments/private/inttypes.h>
35 #include <rudiments/charstring.h>
36
37 //----------------------------------------------------------------------
38 //typedefs
39 typedef unsigned char *POINTER;
40
41 /*
42 * MD5 context.
43 */
44 typedef struct
45 {
46 uint32_t state[4]; /* state (ABCD) */
47 uint32_t count[2]; /* number of bits, modulo 2^64 (lsb first) */
48 unsigned char buffer[64]; /* input buffer */
49 } MD5_CONTEXT;
50
51 /*
52 * MD5 class
53 */
54 class MD5
55 {
56
57 private:
58
59 void MD5Transform (uint32_t state[4], const unsigned char block[64]);
60 void Encode (unsigned char*, uint32_t*, uint64_t);
61 void Decode (uint32_t*, const unsigned char*, uint64_t);
62 void MD5_memcpy (POINTER, POINTER, uint64_t);
63 void MD5_memset (POINTER, int, uint64_t);
64
65 public:
66
67 void MD5Init (MD5_CONTEXT*);
68 void MD5Update (MD5_CONTEXT*, const unsigned char*, uint64_t);
69 void MD5Final (unsigned char [16], MD5_CONTEXT*);
70
MD5()71 MD5(){};
72 };
73
74 #include <stdio.h>
75
76 // Constants for MD5Transform routine.
77 #define S11 7
78 #define S12 12
79 #define S13 17
80 #define S14 22
81 #define S21 5
82 #define S22 9
83 #define S23 14
84 #define S24 20
85 #define S31 4
86 #define S32 11
87 #define S33 16
88 #define S34 23
89 #define S41 6
90 #define S42 10
91 #define S43 15
92 #define S44 21
93
94 static unsigned char PADDING[64] = {
95 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
96 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
97 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
98 };
99
100 /* F, G, H and I are basic MD5 functions. */
101 #define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
102 #define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
103 #define H(x, y, z) ((x) ^ (y) ^ (z))
104 #define I(x, y, z) ((y) ^ ((x) | (~z)))
105
106 /* ROTATE_LEFT rotates x left n bits. */
107 #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
108
109 /*
110 FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
111 Rotation is separate from addition to prevent recomputation.
112 */
113 #define FF(a, b, c, d, x, s, ac) { \
114 (a) += F ((b), (c), (d)) + (x) + (ac); \
115 (a) = ROTATE_LEFT ((a), (s)); \
116 (a) += (b); \
117 }
118
119 #define GG(a, b, c, d, x, s, ac) { \
120 (a) += G ((b), (c), (d)) + (x) + (ac); \
121 (a) = ROTATE_LEFT ((a), (s)); \
122 (a) += (b); \
123 }
124 #define HH(a, b, c, d, x, s, ac) { \
125 (a) += H ((b), (c), (d)) + (x) + (ac); \
126 (a) = ROTATE_LEFT ((a), (s)); \
127 (a) += (b); \
128 }
129 #define II(a, b, c, d, x, s, ac) { \
130 (a) += I ((b), (c), (d)) + (x) + (ac); \
131 (a) = ROTATE_LEFT ((a), (s)); \
132 (a) += (b); \
133 }
134
135 /* MD5 initialization. Begins an MD5 operation, writing a new context. */
MD5Init(MD5_CONTEXT * context)136 void MD5::MD5Init (MD5_CONTEXT *context)
137 {
138 context->count[0] = context->count[1] = 0;
139 context->state[0] = 0x67452301;
140 context->state[1] = 0xefcdab89;
141 context->state[2] = 0x98badcfe;
142 context->state[3] = 0x10325476;
143 }
144
145 /*
146 MD5 block update operation. Continues an MD5 message-digest
147 operation, processing another message block, and updating the
148 context.
149 */
MD5Update(MD5_CONTEXT * context,const unsigned char * input,uint64_t inputLen)150 void MD5::MD5Update (MD5_CONTEXT *context, const unsigned char *input, uint64_t inputLen)
151 {
152 uint64_t i, index, partLen;
153
154 /* Compute number of bytes mod 64 */
155 index = ((context->count[0] >> 3) & 0x3F);
156
157 /* Update number of bits */
158 if ( (context->count[0] += (inputLen << 3))
159 < (inputLen << 3))
160 context->count[1]++;
161
162 context->count[1] += (inputLen >> 29);
163 partLen = 64 - index;
164
165 /*
166 * Transform as many times as possible.
167 */
168 if (inputLen >= partLen)
169 {
170 MD5_memcpy ((POINTER)&context->buffer[index], (POINTER)input, partLen);
171 MD5Transform (context->state, context->buffer);
172
173 for (i = partLen; i + 63 < inputLen; i += 64)
174 MD5Transform (context->state, &input[i]);
175
176 index = 0;
177 }
178 else
179 i = 0;
180
181 /* Buffer remaining input */
182 MD5_memcpy ((POINTER)&context->buffer[index],
183 (POINTER)&input[i],
184 inputLen-i);
185 }
186
187 /*
188 * MD5 finalization. Ends an MD5 message-digest operation, writing the
189 * the message digest and zeroizing the context.
190 */
MD5Final(unsigned char digest[16],MD5_CONTEXT * context)191 void MD5::MD5Final (unsigned char digest[16], MD5_CONTEXT *context)
192 {
193 unsigned char bits[8];
194 uint64_t index, padLen;
195
196 /* Save number of bits */
197 Encode (bits, context->count, 8);
198
199 /*
200 * Pad out to 56 mod 64.
201 */
202 index = ((context->count[0] >> 3) & 0x3f);
203 padLen = (index < 56) ? (56 - index) : (120 - index);
204 MD5Update (context, PADDING, padLen);
205
206 /* Append length (before padding) */
207 MD5Update (context, bits, 8);
208
209 /* Store state in digest */
210 Encode (digest, context->state, 16);
211
212 /*
213 * Zeroize sensitive information.
214 */
215 MD5_memset ((POINTER)context, 0, sizeof (*context));
216 }
217
218 /*
219 * MD5 basic transformation. Transforms state based on block.
220 */
MD5Transform(uint32_t state[4],const unsigned char block[64])221 void MD5::MD5Transform (uint32_t state[4], const unsigned char block[64])
222 {
223 uint32_t a = state[0], b = state[1], c = state[2], d = state[3], x[16];
224
225 Decode (x, block, 64);
226
227 /* Round 1 */
228 FF (a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */
229 FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */
230 FF (c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */
231 FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */
232 FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */
233 FF (d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */
234 FF (c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */
235 FF (b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */
236 FF (a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */
237 FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */
238 FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */
239 FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */
240 FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */
241 FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */
242 FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */
243 FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 */
244
245 /* Round 2 */
246 GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */
247 GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */
248 GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */
249 GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */
250 GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */
251 GG (d, a, b, c, x[10], S22, 0x2441453); /* 22 */
252 GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */
253 GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */
254 GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */
255 GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */
256 GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */
257
258 GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */
259 GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */
260 GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */
261 GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */
262 GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */
263
264 /* Round 3 */
265 HH (a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */
266 HH (d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */
267 HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */
268 HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */
269 HH (a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */
270 HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */
271 HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */
272 HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */
273 HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */
274 HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */
275 HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */
276 HH (b, c, d, a, x[ 6], S34, 0x4881d05); /* 44 */
277 HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */
278 HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */
279 HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */
280 HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */
281
282 /* Round 4 */
283 II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */
284 II (d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */
285 II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */
286 II (b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */
287 II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */
288 II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */
289 II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */
290 II (b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */
291 II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */
292 II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */
293 II (c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */
294 II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */
295 II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */
296 II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */
297 II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */
298 II (b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */
299
300 state[0] += a;
301 state[1] += b;
302 state[2] += c;
303 state[3] += d;
304
305 /*
306 * Zeroize sensitive information.
307 */
308 MD5_memset ((POINTER)x, 0, sizeof (x));
309 }
310
311 /*
312 * Encodes input into output (unsigned char). Assumes len is
313 * a multiple of 4.
314 */
Encode(unsigned char * output,uint32_t * input,uint64_t len)315 void MD5::Encode (unsigned char *output, uint32_t *input, uint64_t len)
316 {
317 uint64_t i, j;
318
319 for (i = 0, j = 0; j < len; i++, j += 4) {
320 output[j] = (unsigned char)(input[i] & 0xff);
321 output[j+1] = (unsigned char)((input[i] >> 8) & 0xff);
322 output[j+2] = (unsigned char)((input[i] >> 16) & 0xff);
323 output[j+3] = (unsigned char)((input[i] >> 24) & 0xff);
324 }
325 }
326
327 /*
328 * Decodes input (unsigned char) into output . Assumes len is
329 * a multiple of 4.
330 */
Decode(uint32_t * output,const unsigned char * input,uint64_t len)331 void MD5::Decode (uint32_t *output, const unsigned char *input, uint64_t len)
332 {
333 uint64_t i, j;
334
335 for (i = 0, j = 0; j < len; i++, j += 4)
336 output[i] = (input[j]) |
337 ((input[j+1]) << 8) |
338 ((input[j+2]) << 16) |
339 ((input[j+3]) << 24);
340 }
341
342 /*
343 * Note: Replace "for loop" with standard memcpy if possible.
344 */
MD5_memcpy(POINTER output,POINTER input,uint64_t len)345 void MD5::MD5_memcpy (POINTER output, POINTER input, uint64_t len)
346 {
347 uint64_t i;
348
349 for (i = 0; i < len; i++)
350 output[i] = input[i];
351 }
352
353 /*
354 * Note: Replace "for loop" with standard memset if possible.
355 */
MD5_memset(POINTER output,int value,uint64_t len)356 void MD5::MD5_memset (POINTER output,int value,uint64_t len)
357 {
358 uint64_t i;
359 for (i = 0; i < len; i++)
360 ((char *)output)[i] = (char)value;
361 }
362