1: /*
2: *
3: * This code implements the MD5 message-digest algorithm.
4: * The algorithm is due to Ron Rivest. This code was
5: * written by Colin Plumb in 1993, no copyright is claimed.
6: * This code is in the public domain; do with it what you wish.
7: *
8: * Equivalent code is available from RSA Data Security, Inc.
9: * This code has been tested against that, and is equivalent,
10: * except that you don't need to include two pages of legalese
11: * with every copy.
12: *
13: * To compute the message digest of a chunk of bytes, declare an
14: * MD5Context structure, pass it to MD5Init, call MD5Update as
15: * needed on buffers full of bytes, and then call MD5Final, which
16: * will fill a supplied 16-byte array with the digest.
17: */
18: #include <string.h> /* for memcpy() */
19: #include "md5.h"
20:
21: void byteReverse(unsigned char *buf, size_t longs);
22:
23: /*
24: * Note: this code is harmless on little-endian machines.
25: */
26: void byteReverse(unsigned char *buf, size_t longs)
27: {
28: uint32_t t;
29: do {
30: t = (uint32_t)((uint16_t)(buf[3] << 8 | buf[2])) << 16 |
31: ((uint16_t)(buf[1] << 8 | buf[0]));
32: *(uint32_t *) buf = t;
33: buf += 4;
34: } while (--longs);
35: }
36:
37: /*
38: * Start MD5 accumulation. Set bit count to 0 and buffer to mysterious
39: * initialization constants.
40: */
41: void MD5Init(struct MD5Context *ctx)
42: {
43: ctx->buf[0] = 0x67452301;
44: ctx->buf[1] = 0xefcdab89;
45: ctx->buf[2] = 0x98badcfe;
46: ctx->buf[3] = 0x10325476;
47:
48: ctx->bits[0] = 0;
49: ctx->bits[1] = 0;
50: }
51:
52: /*
53: * Update context to reflect the concatenation of another buffer full
54: * of bytes.
55: */
56: void MD5Update(struct MD5Context *ctx, unsigned char const *buf, size_t len)
57: {
58: uint32_t t;
59:
60: /* Update bitcount */
61:
62: t = ctx->bits[0];
63: if ((ctx->bits[0] = t + ((uint32_t) len << 3)) < t)
64: ctx->bits[1]++; /* Carry from low to high */
65: ctx->bits[1] += len >> 29;
66:
67: t = (t >> 3) & 0x3f; /* Bytes already in shsInfo->data */
68:
69: /* Handle any leading odd-sized chunks */
70:
71: if (t) {
72: unsigned char *p = (unsigned char *) ctx->in + t;
73:
74: t = 64 - t;
75: if (len < t) {
76: memcpy(p, buf, len);
77: return;
78: }
79: memcpy(p, buf, t);
80: byteReverse(ctx->in, 16);
81: MD5Transform(ctx->buf, (uint32_t *) ctx->in);
82: buf += t;
83: len -= t;
84: }
85: /* Process data in 64-byte chunks */
86:
87: while (len >= 64) {
88: memcpy(ctx->in, buf, 64);
89: byteReverse(ctx->in, 16);
90: MD5Transform(ctx->buf, (uint32_t *) ctx->in);
91: buf += 64;
92: len -= 64;
93: }
94:
95: /* Handle any remaining bytes of data. */
96:
97: memcpy(ctx->in, buf, len);
98: }
99:
100: /*
101: * Final wrapup - pad to 64-byte boundary with the bit pattern
102: * 1 0* (64-bit count of bits processed, MSB-first)
103: */
104: void MD5Final(unsigned char digest[16], struct MD5Context *ctx)
105: {
106: size_t count;
107: unsigned char *p;
108:
109: /* Compute number of bytes mod 64 */
110: count = (ctx->bits[0] >> 3) & 0x3F;
111:
112: /* Set the first char of padding to 0x80. This is safe since there is
113: always at least one byte free */
114: p = ctx->in + count;
115: *p++ = 0x80;
116: /* Bytes of padding needed to make 64 bytes */
117: count = 64 - 1 - count;
118:
119: /* Pad out to 56 mod 64 */
120: if (count < 8) {
121: /* Two lots of padding: Pad the first block to 64 bytes */
122: memset(p, 0, count);
123: byteReverse(ctx->in, 16);
124: MD5Transform(ctx->buf, (uint32_t *) ctx->in);
125:
126: /* Now fill the next block with 56 bytes */
127: memset(ctx->in, 0, 56);
128: } else {
129: /* Pad block to 56 bytes */
130: memset(p, 0, count - 8);
131: }
132: byteReverse(ctx->in, 14);
133:
134: /* Append length in bits and transform */
135: ((uint32_t *) ctx->in)[14] = ctx->bits[0];
136: ((uint32_t *) ctx->in)[15] = ctx->bits[1];
137:
138: MD5Transform(ctx->buf, (uint32_t *) ctx->in);
139: byteReverse((unsigned char *) ctx->buf, 4);
140: memcpy(digest, ctx->buf, 16);
141: memset(ctx, 0, sizeof(ctx)); /* In case it's sensitive */
142: }
143:
144: /* The four core functions - F1 is optimized somewhat */
145:
146: /* #define F1(x, y, z) (x & y | ~x & z) */
147: #define F1(x, y, z) (z ^ (x & (y ^ z)))
148: #define F2(x, y, z) F1(z, x, y)
149: #define F3(x, y, z) (x ^ y ^ z)
150: #define F4(x, y, z) (y ^ (x | ~z))
151:
152: /* This is the central step in the MD5 algorithm. */
153: #define MD5STEP(f, w, x, y, z, data, s) \
154: ( w += f(x, y, z) + data, w = w<<s | w>>(32-s), w += x )
155:
156: /*
157: * The core of the MD5 algorithm, this alters an existing MD5 hash to
158: * reflect the addition of 16 longwords of new data. MD5Update blocks
159: * the data and converts bytes into longwords for this routine.
160: */
161: void MD5Transform(uint32_t buf[4], uint32_t const in[16])
162: {
163: register uint32_t a, b, c, d;
164:
165: a = buf[0];
166: b = buf[1];
167: c = buf[2];
168: d = buf[3];
169:
170: MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7);
171: MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12);
172: MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17);
173: MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22);
174: MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7);
175: MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12);
176: MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17);
177: MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22);
178: MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7);
179: MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12);
180: MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17);
181: MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22);
182: MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7);
183: MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12);
184: MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17);
185: MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22);
186:
187: MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5);
188: MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9);
189: MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14);
190: MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);
191: MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5);
192: MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9);
193: MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14);
194: MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);
195: MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5);
196: MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9);
197: MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14);
198: MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20);
199: MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5);
200: MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);
201: MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14);
202: MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);
203:
204: MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4);
205: MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11);
206: MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16);
207: MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23);
208: MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4);
209: MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);
210: MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);
211: MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23);
212: MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4);
213: MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11);
214: MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16);
215: MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23);
216: MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4);
217: MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11);
218: MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
219: MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23);
220:
221: MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6);
222: MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10);
223: MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15);
224: MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21);
225: MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6);
226: MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);
227: MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15);
228: MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21);
229: MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);
230: MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
231: MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15);
232: MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
233: MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6);
234: MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10);
235: MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);
236: MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21);
237:
238: buf[0] += a;
239: buf[1] += b;
240: buf[2] += c;
241: buf[3] += d;
242: }
243:
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