2 * MD5C.C - RSA Data Security, Inc., MD5 message-digest algorithm
4 * Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All
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
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.
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.
22 * These notices must be retained in any copies of any part of this
23 * documentation and/or software.
25 * This code is the same as the code published by RSA Inc. It has been
26 * edited for clarity and style only.
30 * This file should be kept in sync with src/lib/libmd/md5c.c
32 #include <sys/cdefs.h>
33 __FBSDID("$FreeBSD$");
35 #include <sys/types.h>
38 #include <sys/systm.h>
43 #include <machine/endian.h>
44 #include <sys/endian.h>
47 static void MD5Transform(u_int32_t [4], const unsigned char [64]);
50 #define memset(x,y,z) bzero(x,z);
51 #define memcpy(x,y,z) bcopy(y, x, z)
54 #if (BYTE_ORDER == LITTLE_ENDIAN)
60 * Encodes input (u_int32_t) into output (unsigned char). Assumes len is
65 Encode (unsigned char *output, u_int32_t *input, unsigned int len)
68 u_int32_t *op = (u_int32_t *)output;
70 for (i = 0; i < len / 4; i++)
71 op[i] = htole32(input[i]);
75 * Decodes input (unsigned char) into output (u_int32_t). Assumes len is
80 Decode (u_int32_t *output, const unsigned char *input, unsigned int len)
83 const u_int32_t *ip = (const u_int32_t *)input;
85 for (i = 0; i < len / 4; i++)
86 output[i] = le32toh(ip[i]);
90 static unsigned char PADDING[64] = {
91 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
92 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
93 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
96 /* F, G, H and I are basic MD5 functions. */
97 #define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
98 #define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
99 #define H(x, y, z) ((x) ^ (y) ^ (z))
100 #define I(x, y, z) ((y) ^ ((x) | (~z)))
102 /* ROTATE_LEFT rotates x left n bits. */
103 #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
106 * FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
107 * Rotation is separate from addition to prevent recomputation.
109 #define FF(a, b, c, d, x, s, ac) { \
110 (a) += F ((b), (c), (d)) + (x) + (u_int32_t)(ac); \
111 (a) = ROTATE_LEFT ((a), (s)); \
114 #define GG(a, b, c, d, x, s, ac) { \
115 (a) += G ((b), (c), (d)) + (x) + (u_int32_t)(ac); \
116 (a) = ROTATE_LEFT ((a), (s)); \
119 #define HH(a, b, c, d, x, s, ac) { \
120 (a) += H ((b), (c), (d)) + (x) + (u_int32_t)(ac); \
121 (a) = ROTATE_LEFT ((a), (s)); \
124 #define II(a, b, c, d, x, s, ac) { \
125 (a) += I ((b), (c), (d)) + (x) + (u_int32_t)(ac); \
126 (a) = ROTATE_LEFT ((a), (s)); \
130 /* MD5 initialization. Begins an MD5 operation, writing a new context. */
137 context->count[0] = context->count[1] = 0;
139 /* Load magic initialization constants. */
140 context->state[0] = 0x67452301;
141 context->state[1] = 0xefcdab89;
142 context->state[2] = 0x98badcfe;
143 context->state[3] = 0x10325476;
147 * MD5 block update operation. Continues an MD5 message-digest
148 * operation, processing another message block, and updating the
153 MD5Update (context, input, inputLen)
155 const unsigned char *input;
156 unsigned int inputLen;
158 unsigned int i, index, partLen;
160 /* Compute number of bytes mod 64 */
161 index = (unsigned int)((context->count[0] >> 3) & 0x3F);
163 /* Update number of bits */
164 if ((context->count[0] += ((u_int32_t)inputLen << 3))
165 < ((u_int32_t)inputLen << 3))
167 context->count[1] += ((u_int32_t)inputLen >> 29);
169 partLen = 64 - index;
171 /* Transform as many times as possible. */
172 if (inputLen >= partLen) {
173 memcpy((void *)&context->buffer[index], (const void *)input,
175 MD5Transform (context->state, context->buffer);
177 for (i = partLen; i + 63 < inputLen; i += 64)
178 MD5Transform (context->state, &input[i]);
185 /* Buffer remaining input */
186 memcpy ((void *)&context->buffer[index], (const void *)&input[i],
191 * MD5 padding. Adds padding followed by original length.
198 unsigned char bits[8];
199 unsigned int index, padLen;
201 /* Save number of bits */
202 Encode (bits, context->count, 8);
204 /* Pad out to 56 mod 64. */
205 index = (unsigned int)((context->count[0] >> 3) & 0x3f);
206 padLen = (index < 56) ? (56 - index) : (120 - index);
207 MD5Update (context, PADDING, padLen);
209 /* Append length (before padding) */
210 MD5Update (context, bits, 8);
214 * MD5 finalization. Ends an MD5 message-digest operation, writing the
215 * the message digest and zeroizing the context.
219 MD5Final (digest, context)
220 unsigned char digest[16];
226 /* Store state in digest */
227 Encode (digest, context->state, 16);
229 /* Zeroize sensitive information. */
230 memset ((void *)context, 0, sizeof (*context));
233 /* MD5 basic transformation. Transforms state based on block. */
236 MD5Transform (state, block)
238 const unsigned char block[64];
240 u_int32_t a = state[0], b = state[1], c = state[2], d = state[3], x[16];
242 Decode (x, block, 64);
249 FF (a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */
250 FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */
251 FF (c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */
252 FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */
253 FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */
254 FF (d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */
255 FF (c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */
256 FF (b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */
257 FF (a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */
258 FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */
259 FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */
260 FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */
261 FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */
262 FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */
263 FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */
264 FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 */
271 GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */
272 GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */
273 GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */
274 GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */
275 GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */
276 GG (d, a, b, c, x[10], S22, 0x2441453); /* 22 */
277 GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */
278 GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */
279 GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */
280 GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */
281 GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */
282 GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */
283 GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */
284 GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */
285 GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */
286 GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */
293 HH (a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */
294 HH (d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */
295 HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */
296 HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */
297 HH (a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */
298 HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */
299 HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */
300 HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */
301 HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */
302 HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */
303 HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */
304 HH (b, c, d, a, x[ 6], S34, 0x4881d05); /* 44 */
305 HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */
306 HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */
307 HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */
308 HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */
315 II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */
316 II (d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */
317 II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */
318 II (b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */
319 II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */
320 II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */
321 II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */
322 II (b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */
323 II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */
324 II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */
325 II (c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */
326 II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */
327 II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */
328 II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */
329 II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */
330 II (b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */
337 /* Zeroize sensitive information. */
338 memset ((void *)x, 0, sizeof (x));