1: /*
2: * RFC 1321 compliant MD5 implementation
3: *
4: * Copyright (C) 2001-2003 Christophe Devine
5: *
6: * This program is free software; you can redistribute it and/or modify
7: * it under the terms of the GNU General Public License as published by
8: * the Free Software Foundation; either version 3 of the License, or
9: * (at your option) any later version.
10: *
11: * This program is distributed in the hope that it will be useful,
12: * but WITHOUT ANY WARRANTY; without even the implied warranty of
13: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14: * GNU General Public License for more details.
15: *
16: * You should have received a copy of the GNU General Public License along
17: * with this program; if not, visit the http://fsf.org website.
18: */
19:
20: #include "rsync.h"
21:
22: void md5_begin(md_context *ctx)
23: {
24: ctx->A = 0x67452301;
25: ctx->B = 0xEFCDAB89;
26: ctx->C = 0x98BADCFE;
27: ctx->D = 0x10325476;
28:
29: ctx->totalN = ctx->totalN2 = 0;
30: }
31:
32: static void md5_process(md_context *ctx, const uchar data[CSUM_CHUNK])
33: {
34: uint32 X[16], A, B, C, D;
35:
36: A = ctx->A;
37: B = ctx->B;
38: C = ctx->C;
39: D = ctx->D;
40:
41: X[0] = IVALu(data, 0);
42: X[1] = IVALu(data, 4);
43: X[2] = IVALu(data, 8);
44: X[3] = IVALu(data, 12);
45: X[4] = IVALu(data, 16);
46: X[5] = IVALu(data, 20);
47: X[6] = IVALu(data, 24);
48: X[7] = IVALu(data, 28);
49: X[8] = IVALu(data, 32);
50: X[9] = IVALu(data, 36);
51: X[10] = IVALu(data, 40);
52: X[11] = IVALu(data, 44);
53: X[12] = IVALu(data, 48);
54: X[13] = IVALu(data, 52);
55: X[14] = IVALu(data, 56);
56: X[15] = IVALu(data, 60);
57:
58: #define S(x,n) ((x << n) | ((x & 0xFFFFFFFF) >> (32 - n)))
59:
60: #define P(a,b,c,d,k,s,t) a += F(b,c,d) + X[k] + t, a = S(a,s) + b
61:
62: #define F(x,y,z) (z ^ (x & (y ^ z)))
63:
64: P(A, B, C, D, 0, 7, 0xD76AA478);
65: P(D, A, B, C, 1, 12, 0xE8C7B756);
66: P(C, D, A, B, 2, 17, 0x242070DB);
67: P(B, C, D, A, 3, 22, 0xC1BDCEEE);
68: P(A, B, C, D, 4, 7, 0xF57C0FAF);
69: P(D, A, B, C, 5, 12, 0x4787C62A);
70: P(C, D, A, B, 6, 17, 0xA8304613);
71: P(B, C, D, A, 7, 22, 0xFD469501);
72: P(A, B, C, D, 8, 7, 0x698098D8);
73: P(D, A, B, C, 9, 12, 0x8B44F7AF);
74: P(C, D, A, B, 10, 17, 0xFFFF5BB1);
75: P(B, C, D, A, 11, 22, 0x895CD7BE);
76: P(A, B, C, D, 12, 7, 0x6B901122);
77: P(D, A, B, C, 13, 12, 0xFD987193);
78: P(C, D, A, B, 14, 17, 0xA679438E);
79: P(B, C, D, A, 15, 22, 0x49B40821);
80:
81: #undef F
82: #define F(x,y,z) (y ^ (z & (x ^ y)))
83:
84: P(A, B, C, D, 1, 5, 0xF61E2562);
85: P(D, A, B, C, 6, 9, 0xC040B340);
86: P(C, D, A, B, 11, 14, 0x265E5A51);
87: P(B, C, D, A, 0, 20, 0xE9B6C7AA);
88: P(A, B, C, D, 5, 5, 0xD62F105D);
89: P(D, A, B, C, 10, 9, 0x02441453);
90: P(C, D, A, B, 15, 14, 0xD8A1E681);
91: P(B, C, D, A, 4, 20, 0xE7D3FBC8);
92: P(A, B, C, D, 9, 5, 0x21E1CDE6);
93: P(D, A, B, C, 14, 9, 0xC33707D6);
94: P(C, D, A, B, 3, 14, 0xF4D50D87);
95: P(B, C, D, A, 8, 20, 0x455A14ED);
96: P(A, B, C, D, 13, 5, 0xA9E3E905);
97: P(D, A, B, C, 2, 9, 0xFCEFA3F8);
98: P(C, D, A, B, 7, 14, 0x676F02D9);
99: P(B, C, D, A, 12, 20, 0x8D2A4C8A);
100:
101: #undef F
102: #define F(x,y,z) (x ^ y ^ z)
103:
104: P(A, B, C, D, 5, 4, 0xFFFA3942);
105: P(D, A, B, C, 8, 11, 0x8771F681);
106: P(C, D, A, B, 11, 16, 0x6D9D6122);
107: P(B, C, D, A, 14, 23, 0xFDE5380C);
108: P(A, B, C, D, 1, 4, 0xA4BEEA44);
109: P(D, A, B, C, 4, 11, 0x4BDECFA9);
110: P(C, D, A, B, 7, 16, 0xF6BB4B60);
111: P(B, C, D, A, 10, 23, 0xBEBFBC70);
112: P(A, B, C, D, 13, 4, 0x289B7EC6);
113: P(D, A, B, C, 0, 11, 0xEAA127FA);
114: P(C, D, A, B, 3, 16, 0xD4EF3085);
115: P(B, C, D, A, 6, 23, 0x04881D05);
116: P(A, B, C, D, 9, 4, 0xD9D4D039);
117: P(D, A, B, C, 12, 11, 0xE6DB99E5);
118: P(C, D, A, B, 15, 16, 0x1FA27CF8);
119: P(B, C, D, A, 2, 23, 0xC4AC5665);
120:
121: #undef F
122: #define F(x,y,z) (y ^ (x | ~z))
123:
124: P(A, B, C, D, 0, 6, 0xF4292244);
125: P(D, A, B, C, 7, 10, 0x432AFF97);
126: P(C, D, A, B, 14, 15, 0xAB9423A7);
127: P(B, C, D, A, 5, 21, 0xFC93A039);
128: P(A, B, C, D, 12, 6, 0x655B59C3);
129: P(D, A, B, C, 3, 10, 0x8F0CCC92);
130: P(C, D, A, B, 10, 15, 0xFFEFF47D);
131: P(B, C, D, A, 1, 21, 0x85845DD1);
132: P(A, B, C, D, 8, 6, 0x6FA87E4F);
133: P(D, A, B, C, 15, 10, 0xFE2CE6E0);
134: P(C, D, A, B, 6, 15, 0xA3014314);
135: P(B, C, D, A, 13, 21, 0x4E0811A1);
136: P(A, B, C, D, 4, 6, 0xF7537E82);
137: P(D, A, B, C, 11, 10, 0xBD3AF235);
138: P(C, D, A, B, 2, 15, 0x2AD7D2BB);
139: P(B, C, D, A, 9, 21, 0xEB86D391);
140:
141: #undef F
142:
143: ctx->A += A;
144: ctx->B += B;
145: ctx->C += C;
146: ctx->D += D;
147: }
148:
149: void md5_update(md_context *ctx, const uchar *input, uint32 length)
150: {
151: uint32 left, fill;
152:
153: if (!length)
154: return;
155:
156: left = ctx->totalN & 0x3F;
157: fill = CSUM_CHUNK - left;
158:
159: ctx->totalN += length;
160: ctx->totalN &= 0xFFFFFFFF;
161:
162: if (ctx->totalN < length)
163: ctx->totalN2++;
164:
165: if (left && length >= fill) {
166: memcpy(ctx->buffer + left, input, fill);
167: md5_process(ctx, ctx->buffer);
168: length -= fill;
169: input += fill;
170: left = 0;
171: }
172:
173: while (length >= CSUM_CHUNK) {
174: md5_process(ctx, input);
175: length -= CSUM_CHUNK;
176: input += CSUM_CHUNK;
177: }
178:
179: if (length)
180: memcpy(ctx->buffer + left, input, length);
181: }
182:
183: static uchar md5_padding[CSUM_CHUNK] = { 0x80 };
184:
185: void md5_result(md_context *ctx, uchar digest[MD5_DIGEST_LEN])
186: {
187: uint32 last, padn;
188: uint32 high, low;
189: uchar msglen[8];
190:
191: high = (ctx->totalN >> 29)
192: | (ctx->totalN2 << 3);
193: low = (ctx->totalN << 3);
194:
195: SIVALu(msglen, 0, low);
196: SIVALu(msglen, 4, high);
197:
198: last = ctx->totalN & 0x3F;
199: padn = last < 56 ? 56 - last : 120 - last;
200:
201: md5_update(ctx, md5_padding, padn);
202: md5_update(ctx, msglen, 8);
203:
204: SIVALu(digest, 0, ctx->A);
205: SIVALu(digest, 4, ctx->B);
206: SIVALu(digest, 8, ctx->C);
207: SIVALu(digest, 12, ctx->D);
208: }
209:
210: void get_md5(uchar *out, const uchar *input, int n)
211: {
212: md_context ctx;
213: md5_begin(&ctx);
214: md5_update(&ctx, input, n);
215: md5_result(&ctx, out);
216: }
217:
218: #ifdef TEST_MD5
219:
220: #include <stdlib.h>
221: #include <stdio.h>
222:
223: /*
224: * those are the standard RFC 1321 test vectors
225: */
226:
227: static struct {
228: char *str, *md5;
229: } tests[] = {
230: { "",
231: "d41d8cd98f00b204e9800998ecf8427e" },
232: { "a",
233: "0cc175b9c0f1b6a831c399e269772661" },
234: { "abc",
235: "900150983cd24fb0d6963f7d28e17f72" },
236: { "message digest",
237: "f96b697d7cb7938d525a2f31aaf161d0" },
238: { "abcdefghijklmnopqrstuvwxyz",
239: "c3fcd3d76192e4007dfb496cca67e13b" },
240: { "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789",
241: "d174ab98d277d9f5a5611c2c9f419d9f" },
242: { "12345678901234567890123456789012345678901234567890123456789012345678901234567890",
243: "57edf4a22be3c955ac49da2e2107b67a" },
244: { NULL, NULL }
245: };
246:
247: int main(int argc, char *argv[])
248: {
249: FILE *f;
250: int i, j;
251: char output[33];
252: md_context ctx;
253: uchar buf[1000];
254: uchar md5sum[MD5_DIGEST_LEN];
255:
256: if (argc < 2) {
257: printf("\nMD5 Validation Tests:\n\n");
258:
259: for (i = 0; tests[i].str; i++) {
260: char *str = tests[i].str;
261: char *chk = tests[i].md5;
262:
263: printf(" Test %d ", i + 1);
264:
265: get_md5(md5sum, str, strlen(str));
266:
267: for (j = 0; j < MD5_DIGEST_LEN; j++)
268: sprintf(output + j * 2, "%02x", md5sum[j]);
269:
270: if (memcmp(output, chk, 32)) {
271: printf("failed!\n");
272: return 1;
273: }
274:
275: printf("passed.\n");
276: }
277:
278: printf("\n");
279: return 0;
280: }
281:
282: while (--argc) {
283: if (!(f = fopen(*++argv, "rb"))) {
284: perror("fopen");
285: return 1;
286: }
287:
288: md5_begin(&ctx);
289:
290: while ((i = fread(buf, 1, sizeof buf, f)) > 0)
291: md5_update(&ctx, buf, i);
292:
293: md5_result(&ctx, md5sum);
294:
295: for (j = 0; j < MD5_DIGEST_LEN; j++)
296: printf("%02x", md5sum[j]);
297:
298: printf(" %s\n", *argv);
299: }
300:
301: return 0;
302: }
303:
304: #endif
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