xref: /dragonfly/lib/omd/private_md5.h (revision da217e55)
1 /*
2  * MD5C.C - RSA Data Security, Inc., MD5 message-digest algorithm
3  *
4  * Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All
5  * rights reserved.
6  *
7  * License to copy and use this software is granted provided that it
8  * is identified as the "RSA Data Security, Inc. MD5 Message-Digest
9  * Algorithm" in all material mentioning or referencing this software
10  * or this function.
11  *
12  * License is also granted to make and use derivative works provided
13  * that such works are identified as "derived from the RSA Data
14  * Security, Inc. MD5 Message-Digest Algorithm" in all material
15  * mentioning or referencing the derived work.
16  *
17  * RSA Data Security, Inc. makes no representations concerning either
18  * the merchantability of this software or the suitability of this
19  * software for any particular purpose. It is provided "as is"
20  * without express or implied warranty of any kind.
21  *
22  * These notices must be retained in any copies of any part of this
23  * documentation and/or software.
24  *
25  * This code is the same as the code published by RSA Inc.  It has been
26  * edited for clarity, style and inlineability.
27  */
28 
29 /*
30  * This header shall not have include guards, be included only locally
31  * and not export/pass MD5_CTX unless WITH_OPENSSL.
32  */
33 
34 #include <sys/cdefs.h>
35 #include <sys/types.h>
36 #include <string.h>
37 #include <machine/endian.h>
38 #include <sys/endian.h>
39 
40 #ifdef WITH_OPENSSL
41 #include <openssl/md5.h>
42 #else
43 /* XXX must match <openssl/md5.h> !!! */
44 #define	MD5_CBLOCK		64
45 #define	MD5_DIGEST_LENGTH	16
46 #define MD5_LBLOCK		(MD5_CBLOCK/4)
47 #define	MD5_LONG		unsigned int
48 typedef struct MD5state_st {
49 	MD5_LONG A,B,C,D;
50 	MD5_LONG Nl,Nh;
51 	MD5_LONG data[MD5_LBLOCK];
52 	unsigned int num;
53 } MD5_CTX;
54 #endif
55 
56 #define MD5_BLOCK_LENGTH		MD5_CBLOCK
57 #define MD5_DIGEST_STRING_LENGTH	(MD5_DIGEST_LENGTH * 2 + 1)
58 
59 #if (BYTE_ORDER == LITTLE_ENDIAN)
60 #define _md5_Encode memcpy
61 #define _md5_Decode memcpy
62 #else
63 
64 /*
65  * Encodes input (u_int32_t) into output (unsigned char). Assumes len is
66  * a multiple of 4.
67  */
68 static void
_md5_Encode(unsigned char * output,u_int32_t * input,unsigned int len)69 _md5_Encode (unsigned char *output, u_int32_t *input, unsigned int len)
70 {
71 	unsigned int i;
72 	u_int32_t *op = (u_int32_t *)output;
73 
74 	for (i = 0; i < len / 4; i++)
75 		op[i] = htole32(input[i]);
76 }
77 
78 /*
79  * Decodes input (unsigned char) into output (u_int32_t). Assumes len is
80  * a multiple of 4.
81  */
82 static void
_md5_Decode(u_int32_t * output,const unsigned char * input,unsigned int len)83 _md5_Decode (u_int32_t *output, const unsigned char *input, unsigned int len)
84 {
85 	unsigned int i;
86 	const u_int32_t *ip = (const u_int32_t *)input;
87 
88 	for (i = 0; i < len / 4; i++)
89 		output[i] = le32toh(ip[i]);
90 }
91 #endif
92 
93 static unsigned char _md5_PADDING[64] = {
94   0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
95   0, 0, 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
97 };
98 
99 /* F, G, H and I are basic MD5 functions. */
100 #define _md5_F(x, y, z) (((x) & (y)) | ((~x) & (z)))
101 #define _md5_G(x, y, z) (((x) & (z)) | ((y) & (~z)))
102 #define _md5_H(x, y, z) ((x) ^ (y) ^ (z))
103 #define _md5_I(x, y, z) ((y) ^ ((x) | (~z)))
104 
105 /* ROTATE_LEFT rotates x left n bits. */
106 #define _md5_ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
107 
108 /*
109  * FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
110  * Rotation is separate from addition to prevent recomputation.
111  */
112 #define _md5_FF(a, b, c, d, x, s, ac) { \
113 	(a) += _md5_F ((b), (c), (d)) + (x) + (u_int32_t)(ac); \
114 	(a) = _md5_ROTATE_LEFT ((a), (s)); \
115 	(a) += (b); \
116 	}
117 #define _md5_GG(a, b, c, d, x, s, ac) { \
118 	(a) += _md5_G ((b), (c), (d)) + (x) + (u_int32_t)(ac); \
119 	(a) = _md5_ROTATE_LEFT ((a), (s)); \
120 	(a) += (b); \
121 	}
122 #define _md5_HH(a, b, c, d, x, s, ac) { \
123 	(a) += _md5_H ((b), (c), (d)) + (x) + (u_int32_t)(ac); \
124 	(a) = _md5_ROTATE_LEFT ((a), (s)); \
125 	(a) += (b); \
126 	}
127 #define _md5_II(a, b, c, d, x, s, ac) { \
128 	(a) += _md5_I ((b), (c), (d)) + (x) + (u_int32_t)(ac); \
129 	(a) = _md5_ROTATE_LEFT ((a), (s)); \
130 	(a) += (b); \
131 	}
132 
133 /* MD5 basic transformation. Transforms state based on block. */
134 static void
MD5Transform(u_int32_t * state,const unsigned char * block)135 MD5Transform (u_int32_t *state, const unsigned char *block)
136 {
137 	u_int32_t a = state[0], b = state[1], c = state[2], d = state[3], x[16];
138 
139 	_md5_Decode (x, block, 64);
140 
141 	/* Round 1 */
142 #define _md5_S11 7
143 #define _md5_S12 12
144 #define _md5_S13 17
145 #define _md5_S14 22
146 	_md5_FF (a, b, c, d, x[ 0], _md5_S11, 0xd76aa478); /* 1 */
147 	_md5_FF (d, a, b, c, x[ 1], _md5_S12, 0xe8c7b756); /* 2 */
148 	_md5_FF (c, d, a, b, x[ 2], _md5_S13, 0x242070db); /* 3 */
149 	_md5_FF (b, c, d, a, x[ 3], _md5_S14, 0xc1bdceee); /* 4 */
150 	_md5_FF (a, b, c, d, x[ 4], _md5_S11, 0xf57c0faf); /* 5 */
151 	_md5_FF (d, a, b, c, x[ 5], _md5_S12, 0x4787c62a); /* 6 */
152 	_md5_FF (c, d, a, b, x[ 6], _md5_S13, 0xa8304613); /* 7 */
153 	_md5_FF (b, c, d, a, x[ 7], _md5_S14, 0xfd469501); /* 8 */
154 	_md5_FF (a, b, c, d, x[ 8], _md5_S11, 0x698098d8); /* 9 */
155 	_md5_FF (d, a, b, c, x[ 9], _md5_S12, 0x8b44f7af); /* 10 */
156 	_md5_FF (c, d, a, b, x[10], _md5_S13, 0xffff5bb1); /* 11 */
157 	_md5_FF (b, c, d, a, x[11], _md5_S14, 0x895cd7be); /* 12 */
158 	_md5_FF (a, b, c, d, x[12], _md5_S11, 0x6b901122); /* 13 */
159 	_md5_FF (d, a, b, c, x[13], _md5_S12, 0xfd987193); /* 14 */
160 	_md5_FF (c, d, a, b, x[14], _md5_S13, 0xa679438e); /* 15 */
161 	_md5_FF (b, c, d, a, x[15], _md5_S14, 0x49b40821); /* 16 */
162 
163 	/* Round 2 */
164 #define _md5_S21 5
165 #define _md5_S22 9
166 #define _md5_S23 14
167 #define _md5_S24 20
168 	_md5_GG (a, b, c, d, x[ 1], _md5_S21, 0xf61e2562); /* 17 */
169 	_md5_GG (d, a, b, c, x[ 6], _md5_S22, 0xc040b340); /* 18 */
170 	_md5_GG (c, d, a, b, x[11], _md5_S23, 0x265e5a51); /* 19 */
171 	_md5_GG (b, c, d, a, x[ 0], _md5_S24, 0xe9b6c7aa); /* 20 */
172 	_md5_GG (a, b, c, d, x[ 5], _md5_S21, 0xd62f105d); /* 21 */
173 	_md5_GG (d, a, b, c, x[10], _md5_S22,  0x2441453); /* 22 */
174 	_md5_GG (c, d, a, b, x[15], _md5_S23, 0xd8a1e681); /* 23 */
175 	_md5_GG (b, c, d, a, x[ 4], _md5_S24, 0xe7d3fbc8); /* 24 */
176 	_md5_GG (a, b, c, d, x[ 9], _md5_S21, 0x21e1cde6); /* 25 */
177 	_md5_GG (d, a, b, c, x[14], _md5_S22, 0xc33707d6); /* 26 */
178 	_md5_GG (c, d, a, b, x[ 3], _md5_S23, 0xf4d50d87); /* 27 */
179 	_md5_GG (b, c, d, a, x[ 8], _md5_S24, 0x455a14ed); /* 28 */
180 	_md5_GG (a, b, c, d, x[13], _md5_S21, 0xa9e3e905); /* 29 */
181 	_md5_GG (d, a, b, c, x[ 2], _md5_S22, 0xfcefa3f8); /* 30 */
182 	_md5_GG (c, d, a, b, x[ 7], _md5_S23, 0x676f02d9); /* 31 */
183 	_md5_GG (b, c, d, a, x[12], _md5_S24, 0x8d2a4c8a); /* 32 */
184 
185 	/* Round 3 */
186 #define _md5_S31 4
187 #define _md5_S32 11
188 #define _md5_S33 16
189 #define _md5_S34 23
190 	_md5_HH (a, b, c, d, x[ 5], _md5_S31, 0xfffa3942); /* 33 */
191 	_md5_HH (d, a, b, c, x[ 8], _md5_S32, 0x8771f681); /* 34 */
192 	_md5_HH (c, d, a, b, x[11], _md5_S33, 0x6d9d6122); /* 35 */
193 	_md5_HH (b, c, d, a, x[14], _md5_S34, 0xfde5380c); /* 36 */
194 	_md5_HH (a, b, c, d, x[ 1], _md5_S31, 0xa4beea44); /* 37 */
195 	_md5_HH (d, a, b, c, x[ 4], _md5_S32, 0x4bdecfa9); /* 38 */
196 	_md5_HH (c, d, a, b, x[ 7], _md5_S33, 0xf6bb4b60); /* 39 */
197 	_md5_HH (b, c, d, a, x[10], _md5_S34, 0xbebfbc70); /* 40 */
198 	_md5_HH (a, b, c, d, x[13], _md5_S31, 0x289b7ec6); /* 41 */
199 	_md5_HH (d, a, b, c, x[ 0], _md5_S32, 0xeaa127fa); /* 42 */
200 	_md5_HH (c, d, a, b, x[ 3], _md5_S33, 0xd4ef3085); /* 43 */
201 	_md5_HH (b, c, d, a, x[ 6], _md5_S34,  0x4881d05); /* 44 */
202 	_md5_HH (a, b, c, d, x[ 9], _md5_S31, 0xd9d4d039); /* 45 */
203 	_md5_HH (d, a, b, c, x[12], _md5_S32, 0xe6db99e5); /* 46 */
204 	_md5_HH (c, d, a, b, x[15], _md5_S33, 0x1fa27cf8); /* 47 */
205 	_md5_HH (b, c, d, a, x[ 2], _md5_S34, 0xc4ac5665); /* 48 */
206 
207 	/* Round 4 */
208 #define _md5_S41 6
209 #define _md5_S42 10
210 #define _md5_S43 15
211 #define _md5_S44 21
212 	_md5_II (a, b, c, d, x[ 0], _md5_S41, 0xf4292244); /* 49 */
213 	_md5_II (d, a, b, c, x[ 7], _md5_S42, 0x432aff97); /* 50 */
214 	_md5_II (c, d, a, b, x[14], _md5_S43, 0xab9423a7); /* 51 */
215 	_md5_II (b, c, d, a, x[ 5], _md5_S44, 0xfc93a039); /* 52 */
216 	_md5_II (a, b, c, d, x[12], _md5_S41, 0x655b59c3); /* 53 */
217 	_md5_II (d, a, b, c, x[ 3], _md5_S42, 0x8f0ccc92); /* 54 */
218 	_md5_II (c, d, a, b, x[10], _md5_S43, 0xffeff47d); /* 55 */
219 	_md5_II (b, c, d, a, x[ 1], _md5_S44, 0x85845dd1); /* 56 */
220 	_md5_II (a, b, c, d, x[ 8], _md5_S41, 0x6fa87e4f); /* 57 */
221 	_md5_II (d, a, b, c, x[15], _md5_S42, 0xfe2ce6e0); /* 58 */
222 	_md5_II (c, d, a, b, x[ 6], _md5_S43, 0xa3014314); /* 59 */
223 	_md5_II (b, c, d, a, x[13], _md5_S44, 0x4e0811a1); /* 60 */
224 	_md5_II (a, b, c, d, x[ 4], _md5_S41, 0xf7537e82); /* 61 */
225 	_md5_II (d, a, b, c, x[11], _md5_S42, 0xbd3af235); /* 62 */
226 	_md5_II (c, d, a, b, x[ 2], _md5_S43, 0x2ad7d2bb); /* 63 */
227 	_md5_II (b, c, d, a, x[ 9], _md5_S44, 0xeb86d391); /* 64 */
228 
229 	state[0] += a;
230 	state[1] += b;
231 	state[2] += c;
232 	state[3] += d;
233 
234 	/* Zeroize sensitive information. */
235 	memset ((void *)x, 0, sizeof (x));
236 }
237 
238 /* MD5 initialization. Begins an MD5 operation, writing a new context. */
239 static int
MD5Init(MD5_CTX * context)240 MD5Init (MD5_CTX *context)
241 {
242 
243 	context->Nl = context->Nh = 0;
244 
245 	/* Load magic initialization constants.  */
246 	context->A = 0x67452301;
247 	context->B = 0xefcdab89;
248 	context->C = 0x98badcfe;
249 	context->D = 0x10325476;
250 	return 1;
251 }
252 /*
253  * MD5 block update operation. Continues an MD5 message-digest
254  * operation, processing another message block, and updating the
255  * context.
256  */
257 static void
MD5Update(MD5_CTX * context,const void * in,unsigned int inputLen)258 MD5Update (MD5_CTX *context, const void *in, unsigned int inputLen)
259 {
260 	unsigned int i, idx, partLen;
261 	const unsigned char *input = in;
262 
263 	/* Compute number of bytes mod 64 */
264 	idx = (unsigned int)((context->Nl >> 3) & 0x3F);
265 
266 	/* Update number of bits */
267 	if ((context->Nl += ((u_int32_t)inputLen << 3))
268 	    < ((u_int32_t)inputLen << 3))
269 		context->Nh++;
270 	context->Nh += ((u_int32_t)inputLen >> 29);
271 
272 	partLen = 64 - idx;
273 
274 	/* Transform as many times as possible. */
275 	if (inputLen >= partLen) {
276 		memcpy(&((char *)context->data)[idx], (const void *)input,
277 		    partLen);
278 		MD5Transform (&context->A, (unsigned char *)context->data);
279 
280 		for (i = partLen; i + 63 < inputLen; i += 64)
281 			MD5Transform (&context->A, &input[i]);
282 
283 		idx = 0;
284 	}
285 	else
286 		i = 0;
287 
288 	/* Buffer remaining input */
289 	memcpy (&((char *)context->data)[idx], (const void *)&input[i],
290 	    inputLen-i);
291 }
292 
293 /*
294  * MD5 padding. Adds padding followed by original length.
295  */
296 static void
MD5Pad(MD5_CTX * context)297 MD5Pad (MD5_CTX *context)
298 {
299 	unsigned char bits[8];
300 	unsigned int idx, padLen;
301 
302 	/* Save number of bits */
303 	_md5_Encode (bits, &context->Nl, 8);
304 
305 	/* Pad out to 56 mod 64. */
306 	idx = (unsigned int)((context->Nl >> 3) & 0x3f);
307 	padLen = (idx < 56) ? (56 - idx) : (120 - idx);
308 	MD5Update (context, _md5_PADDING, padLen);
309 
310 	/* Append length (before padding) */
311 	MD5Update (context, bits, 8);
312 }
313 
314 /*
315  * MD5 finalization. Ends an MD5 message-digest operation, writing the
316  * the message digest and zeroizing the context.
317  */
318 static void
MD5Final(unsigned char digest[16],MD5_CTX * context)319 MD5Final (unsigned char digest[16], MD5_CTX *context)
320 {
321 	/* Do padding. */
322 	MD5Pad (context);
323 
324 	/* Store state in digest */
325 	_md5_Encode (digest, &context->A, 16);
326 
327 	/* Zeroize sensitive information. */
328 	memset ((void *)context, 0, sizeof (*context));
329 }
330