Annotation of src/common/lib/libc/md/md5c.c, Revision 1.5
1.5 ! matt 1: /* $NetBSD: md5c.c,v 1.4 2009/03/16 05:59:21 cegger Exp $ */
1.1 christos 2:
3: /*
4: * This file is derived from the RSA Data Security, Inc. MD5 Message-Digest
5: * Algorithm and has been modified by Jason R. Thorpe <thorpej@NetBSD.org>
6: * for portability and formatting.
7: */
8:
9: /*
10: * Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All
11: * rights reserved.
12: *
13: * License to copy and use this software is granted provided that it
14: * is identified as the "RSA Data Security, Inc. MD5 Message-Digest
15: * Algorithm" in all material mentioning or referencing this software
16: * or this function.
17: *
18: * License is also granted to make and use derivative works provided
19: * that such works are identified as "derived from the RSA Data
20: * Security, Inc. MD5 Message-Digest Algorithm" in all material
21: * mentioning or referencing the derived work.
22: *
23: * RSA Data Security, Inc. makes no representations concerning either
24: * the merchantability of this software or the suitability of this
25: * software for any particular purpose. It is provided "as is"
26: * without express or implied warranty of any kind.
27: *
28: * These notices must be retained in any copies of any part of this
29: * documentation and/or software.
30: */
31:
32: #if defined(_KERNEL) || defined(_STANDALONE)
33: #include <sys/param.h>
34: #include <sys/md5.h>
1.2 matt 35: #include <lib/libkern/libkern.h>
1.1 christos 36: #else
37: #include <sys/cdefs.h>
38: #if defined(LIBC_SCCS) && !defined(lint)
1.5 ! matt 39: __RCSID("$NetBSD: md5c.c,v 1.4 2009/03/16 05:59:21 cegger Exp $");
1.1 christos 40: #endif /* LIBC_SCCS and not lint */
41: #include "namespace.h"
42: #include <sys/types.h>
43: #include <assert.h>
44: #include <string.h>
45: #include <md5.h>
46: #endif /* _KERNEL || _STANDALONE */
47:
48: #if HAVE_NBTOOL_CONFIG_H
49: #include "nbtool_config.h"
50: #endif
51:
52: #if !HAVE_MD5_H
53:
54: #define ZEROIZE(d, l) memset((d), 0, (l))
55:
56: typedef unsigned char *POINTER;
1.3 apb 57: typedef uint16_t UINT2;
58: typedef uint32_t UINT4;
1.1 christos 59:
60: /*
61: * Constants for MD5Transform routine.
62: */
63: #define S11 7
64: #define S12 12
65: #define S13 17
66: #define S14 22
67: #define S21 5
68: #define S22 9
69: #define S23 14
70: #define S24 20
71: #define S31 4
72: #define S32 11
73: #define S33 16
74: #define S34 23
75: #define S41 6
76: #define S42 10
77: #define S43 15
78: #define S44 21
79:
80: #if !defined(_KERNEL) && !defined(_STANDALONE) && defined(__weak_alias)
81: __weak_alias(MD5Init,_MD5Init)
82: __weak_alias(MD5Update,_MD5Update)
83: __weak_alias(MD5Final,_MD5Final)
84: __weak_alias(MD5Transform,_MD5Transform)
85: #endif
86:
1.5 ! matt 87: static void MD5Transform(UINT4 [4], const unsigned char [64]);
1.1 christos 88:
1.5 ! matt 89: static void Encode(unsigned char *, UINT4 *, unsigned int);
! 90: static void Decode(UINT4 *, const unsigned char *, unsigned int);
1.1 christos 91:
92: /*
93: * Encodes input (UINT4) into output (unsigned char). Assumes len is
94: * a multiple of 4.
95: */
96: static void
1.4 cegger 97: Encode (unsigned char *output,
98: UINT4 *input,
99: unsigned int len)
1.1 christos 100: {
101: unsigned int i, j;
102:
103: for (i = 0, j = 0; j < len; i++, j += 4) {
104: output[j] = (unsigned char)(input[i] & 0xff);
105: output[j+1] = (unsigned char)((input[i] >> 8) & 0xff);
106: output[j+2] = (unsigned char)((input[i] >> 16) & 0xff);
107: output[j+3] = (unsigned char)((input[i] >> 24) & 0xff);
108: }
109: }
110:
111: /*
112: * Decodes input (unsigned char) into output (UINT4). Assumes len is
113: * a multiple of 4.
114: */
115: static void
1.4 cegger 116: Decode (UINT4 *output,
117: const unsigned char *input,
118: unsigned int len)
1.1 christos 119: {
120: unsigned int i, j;
121:
122: for (i = 0, j = 0; j < len; i++, j += 4)
123: output[i] = ((UINT4)input[j]) | (((UINT4)input[j+1]) << 8) |
124: (((UINT4)input[j+2]) << 16) | (((UINT4)input[j+3]) << 24);
125: }
126:
127: static const unsigned char PADDING[64] = {
128: 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
129: 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
130: 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
131: };
132:
133: /*
134: * F, G, H and I are basic MD5 functions.
135: */
136: #define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
137: #define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
138: #define H(x, y, z) ((x) ^ (y) ^ (z))
139: #define I(x, y, z) ((y) ^ ((x) | (~z)))
140:
141: /*
142: * ROTATE_LEFT rotates x left n bits.
143: */
144: #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
145:
146: /*
147: * FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
148: * Rotation is separate from addition to prevent recomputation.
149: */
150: #define FF(a, b, c, d, x, s, ac) { \
151: (a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \
152: (a) = ROTATE_LEFT ((a), (s)); \
153: (a) += (b); \
154: }
155:
156: #define GG(a, b, c, d, x, s, ac) { \
157: (a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \
158: (a) = ROTATE_LEFT ((a), (s)); \
159: (a) += (b); \
160: }
161:
162: #define HH(a, b, c, d, x, s, ac) { \
163: (a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \
164: (a) = ROTATE_LEFT ((a), (s)); \
165: (a) += (b); \
166: }
167:
168: #define II(a, b, c, d, x, s, ac) { \
169: (a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \
170: (a) = ROTATE_LEFT ((a), (s)); \
171: (a) += (b); \
172: }
173:
174: /*
175: * MD5 initialization. Begins an MD5 operation, writing a new context.
176: */
177: void
1.4 cegger 178: MD5Init(MD5_CTX *context)
1.1 christos 179: {
180:
181: _DIAGASSERT(context != 0);
182:
183: context->count[0] = context->count[1] = 0;
184:
185: /* Load magic initialization constants. */
186: context->state[0] = 0x67452301;
187: context->state[1] = 0xefcdab89;
188: context->state[2] = 0x98badcfe;
189: context->state[3] = 0x10325476;
190: }
191:
192: /*
193: * MD5 block update operation. Continues an MD5 message-digest
194: * operation, processing another message block, and updating the
195: * context.
196: */
197: void
1.4 cegger 198: MD5Update(MD5_CTX *context,
199: const unsigned char *input, /* input block */
200: unsigned int inputLen) /* length of input block */
1.1 christos 201: {
202: unsigned int i, idx, partLen;
203:
204: _DIAGASSERT(context != 0);
205: _DIAGASSERT(input != 0);
206:
207: /* Compute number of bytes mod 64 */
208: idx = (unsigned int)((context->count[0] >> 3) & 0x3F);
209:
210: /* Update number of bits */
211: if ((context->count[0] += ((UINT4)inputLen << 3))
212: < ((UINT4)inputLen << 3))
213: context->count[1]++;
214: context->count[1] += ((UINT4)inputLen >> 29);
215:
216: partLen = 64 - idx;
217:
218: /* Transform as many times as possible. */
219: if (inputLen >= partLen) {
220: memcpy((POINTER)&context->buffer[idx], input, partLen);
221: MD5Transform(context->state, context->buffer);
222:
223: for (i = partLen; i + 63 < inputLen; i += 64)
224: MD5Transform(context->state, &input[i]);
225:
226: idx = 0;
227: } else
228: i = 0;
229:
230: /* Buffer remaining input */
231: memcpy(&context->buffer[idx], &input[i], inputLen - i);
232: }
233:
234: /*
235: * MD5 finalization. Ends an MD5 message-digest operation, writing the
236: * message digest and zeroing the context.
237: */
238: void
1.4 cegger 239: MD5Final(unsigned char digest[16], /* message digest */
240: MD5_CTX *context) /* context */
1.1 christos 241: {
242: unsigned char bits[8];
243: unsigned int idx, padLen;
244:
245: _DIAGASSERT(digest != 0);
246: _DIAGASSERT(context != 0);
247:
248: /* Save number of bits */
249: Encode(bits, context->count, 8);
250:
251: /* Pad out to 56 mod 64. */
252: idx = (unsigned int)((context->count[0] >> 3) & 0x3f);
253: padLen = (idx < 56) ? (56 - idx) : (120 - idx);
254: MD5Update (context, PADDING, padLen);
255:
256: /* Append length (before padding) */
257: MD5Update(context, bits, 8);
258:
259: /* Store state in digest */
260: Encode(digest, context->state, 16);
261:
262: /* Zeroize sensitive information. */
263: ZEROIZE((POINTER)(void *)context, sizeof(*context));
264: }
265:
266: /*
267: * MD5 basic transformation. Transforms state based on block.
268: */
269: static void
1.4 cegger 270: MD5Transform(UINT4 state[4], const unsigned char block[64])
1.1 christos 271: {
272: UINT4 a = state[0], b = state[1], c = state[2], d = state[3], x[16];
273:
274: Decode(x, block, 64);
275:
276: /* Round 1 */
277: FF (a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */
278: FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */
279: FF (c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */
280: FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */
281: FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */
282: FF (d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */
283: FF (c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */
284: FF (b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */
285: FF (a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */
286: FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */
287: FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */
288: FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */
289: FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */
290: FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */
291: FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */
292: FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 */
293:
294: /* Round 2 */
295: GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */
296: GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */
297: GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */
298: GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */
299: GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */
300: GG (d, a, b, c, x[10], S22, 0x2441453); /* 22 */
301: GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */
302: GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */
303: GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */
304: GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */
305: GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */
306: GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */
307: GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */
308: GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */
309: GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */
310: GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */
311:
312: /* Round 3 */
313: HH (a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */
314: HH (d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */
315: HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */
316: HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */
317: HH (a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */
318: HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */
319: HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */
320: HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */
321: HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */
322: HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */
323: HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */
324: HH (b, c, d, a, x[ 6], S34, 0x4881d05); /* 44 */
325: HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */
326: HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */
327: HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */
328: HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */
329:
330: /* Round 4 */
331: II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */
332: II (d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */
333: II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */
334: II (b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */
335: II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */
336: II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */
337: II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */
338: II (b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */
339: II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */
340: II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */
341: II (c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */
342: II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */
343: II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */
344: II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */
345: II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */
346: II (b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */
347:
348: state[0] += a;
349: state[1] += b;
350: state[2] += c;
351: state[3] += d;
352:
353: /* Zeroize sensitive information. */
354: ZEROIZE((POINTER)(void *)x, sizeof (x));
355: }
356:
357: #endif /* HAVE_MD5_H */
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