2 This Library has been modified from its original form by
3 Brian Aker (brian@tangent.org)
5 See below for original Copyright.
7 /* MD5C.C - RSA Data Security, Inc., MD5 message-digest algorithm
10 /* Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All
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
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.
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.
28 These notices must be retained in any copies of any part of this
29 documentation and/or software.
34 #include <sys/types.h>
36 /* POINTER defines a generic pointer type */
37 typedef unsigned char *POINTER
;
40 /* UINT4 defines a four byte word */
41 typedef unsigned int UINT4
;
46 UINT4 state
[4]; /* state (ABCD) */
47 UINT4 count
[2]; /* number of bits, modulo 2^64 (lsb first) */
48 unsigned char buffer
[64]; /* input buffer */
51 static void MD5Init (MD5_CTX
*context
); /* context */
52 static void MD5Update ( MD5_CTX
*context
, /* context */
53 const unsigned char *input
, /* input block */
54 unsigned int inputLen
); /* length of input block */
55 static void MD5Final ( unsigned char digest
[16], /* message digest */
56 MD5_CTX
*context
); /* context */
58 /* Constants for MD5Transform routine. */
78 static void MD5Transform (UINT4 state
[4],
79 unsigned char block
[64]);
80 static void Encode (unsigned char *output
,
83 static void Decode(UINT4
*output
, unsigned char *input
, unsigned int len
);
85 static unsigned char PADDING
[64] = {
86 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
87 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
88 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
91 /* F, G, H and I are basic MD5 functions.
93 #define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
94 #define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
95 #define H(x, y, z) ((x) ^ (y) ^ (z))
96 #define I(x, y, z) ((y) ^ ((x) | (~z)))
98 /* ROTATE_LEFT rotates x left n bits.
100 #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
102 /* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
103 Rotation is separate from addition to prevent recomputation.
105 #define FF(a, b, c, d, x, s, ac) { \
106 (a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \
107 (a) = ROTATE_LEFT ((a), (s)); \
110 #define GG(a, b, c, d, x, s, ac) { \
111 (a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \
112 (a) = ROTATE_LEFT ((a), (s)); \
115 #define HH(a, b, c, d, x, s, ac) { \
116 (a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \
117 (a) = ROTATE_LEFT ((a), (s)); \
120 #define II(a, b, c, d, x, s, ac) { \
121 (a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \
122 (a) = ROTATE_LEFT ((a), (s)); \
128 Just a simple method for getting the signature
131 void md5_signature(const unsigned char *key
, unsigned int length
, unsigned char *result
)
136 (void)MD5Update(&my_md5
, key
, length
);
137 MD5Final(result
, &my_md5
);
140 /* MD5 initialization. Begins an MD5 operation, writing a new context.
142 static void MD5Init (MD5_CTX
*context
) /* context */
144 context
->count
[0] = context
->count
[1] = 0;
145 /* Load magic initialization constants.
147 context
->state
[0] = 0x67452301;
148 context
->state
[1] = 0xefcdab89;
149 context
->state
[2] = 0x98badcfe;
150 context
->state
[3] = 0x10325476;
153 /* MD5 block update operation. Continues an MD5 message-digest
154 operation, processing another message block, and updating the
158 static void MD5Update (
159 MD5_CTX
*context
, /* context */
160 const unsigned char *input
, /* input block */
161 unsigned int inputLen
) /* length of input block */
163 unsigned int i
, idx
, partLen
;
165 /* Compute number of bytes mod 64 */
166 idx
= (unsigned int)((context
->count
[0] >> 3) & 0x3F);
169 /* Update number of bits */
170 if ((context
->count
[0] += ((UINT4
)inputLen
<< 3))
171 < ((UINT4
)inputLen
<< 3))
173 context
->count
[1] += ((UINT4
)inputLen
>> 29);
177 /* Transform as many times as possible.
179 if (inputLen
>= partLen
) {
180 memcpy((POINTER
)&context
->buffer
[idx
], (POINTER
)input
, partLen
);
181 MD5Transform(context
->state
, context
->buffer
);
183 for (i
= partLen
; i
+ 63 < inputLen
; i
+= 64)
184 MD5Transform (context
->state
, (unsigned char *)&input
[i
]);
191 /* Buffer remaining input */
192 memcpy((POINTER
)&context
->buffer
[idx
], (POINTER
)&input
[i
],
196 /* MD5 finalization. Ends an MD5 message-digest operation, writing the
197 the message digest and zeroizing the context.
200 static void MD5Final (
201 unsigned char digest
[16], /* message digest */
202 MD5_CTX
*context
) /* context */
204 unsigned char bits
[8];
205 unsigned int idx
, padLen
;
207 /* Save number of bits */
208 Encode (bits
, context
->count
, 8);
210 /* Pad out to 56 mod 64.
212 idx
= (unsigned int)((context
->count
[0] >> 3) & 0x3f);
213 padLen
= (idx
< 56) ? (56 - idx
) : (120 - idx
);
214 MD5Update (context
, PADDING
, padLen
);
216 /* Append length (before padding) */
217 MD5Update (context
, bits
, 8);
219 /* Store state in digest */
220 Encode (digest
, context
->state
, 16);
222 /* Zeroize sensitive information.
224 memset((POINTER
)context
, 0, sizeof (*context
));
227 /* MD5 basic transformation. Transforms state based on block.
229 static void MD5Transform (
231 unsigned char block
[64])
233 UINT4 a
= state
[0], b
= state
[1], c
= state
[2], d
= state
[3], x
[16];
235 Decode (x
, block
, 64);
238 FF (a
, b
, c
, d
, x
[ 0], S11
, 0xd76aa478); /* 1 */
239 FF (d
, a
, b
, c
, x
[ 1], S12
, 0xe8c7b756); /* 2 */
240 FF (c
, d
, a
, b
, x
[ 2], S13
, 0x242070db); /* 3 */
241 FF (b
, c
, d
, a
, x
[ 3], S14
, 0xc1bdceee); /* 4 */
242 FF (a
, b
, c
, d
, x
[ 4], S11
, 0xf57c0faf); /* 5 */
243 FF (d
, a
, b
, c
, x
[ 5], S12
, 0x4787c62a); /* 6 */
244 FF (c
, d
, a
, b
, x
[ 6], S13
, 0xa8304613); /* 7 */
245 FF (b
, c
, d
, a
, x
[ 7], S14
, 0xfd469501); /* 8 */
246 FF (a
, b
, c
, d
, x
[ 8], S11
, 0x698098d8); /* 9 */
247 FF (d
, a
, b
, c
, x
[ 9], S12
, 0x8b44f7af); /* 10 */
248 FF (c
, d
, a
, b
, x
[10], S13
, 0xffff5bb1); /* 11 */
249 FF (b
, c
, d
, a
, x
[11], S14
, 0x895cd7be); /* 12 */
250 FF (a
, b
, c
, d
, x
[12], S11
, 0x6b901122); /* 13 */
251 FF (d
, a
, b
, c
, x
[13], S12
, 0xfd987193); /* 14 */
252 FF (c
, d
, a
, b
, x
[14], S13
, 0xa679438e); /* 15 */
253 FF (b
, c
, d
, a
, x
[15], S14
, 0x49b40821); /* 16 */
256 GG (a
, b
, c
, d
, x
[ 1], S21
, 0xf61e2562); /* 17 */
257 GG (d
, a
, b
, c
, x
[ 6], S22
, 0xc040b340); /* 18 */
258 GG (c
, d
, a
, b
, x
[11], S23
, 0x265e5a51); /* 19 */
259 GG (b
, c
, d
, a
, x
[ 0], S24
, 0xe9b6c7aa); /* 20 */
260 GG (a
, b
, c
, d
, x
[ 5], S21
, 0xd62f105d); /* 21 */
261 GG (d
, a
, b
, c
, x
[10], S22
, 0x2441453); /* 22 */
262 GG (c
, d
, a
, b
, x
[15], S23
, 0xd8a1e681); /* 23 */
263 GG (b
, c
, d
, a
, x
[ 4], S24
, 0xe7d3fbc8); /* 24 */
264 GG (a
, b
, c
, d
, x
[ 9], S21
, 0x21e1cde6); /* 25 */
265 GG (d
, a
, b
, c
, x
[14], S22
, 0xc33707d6); /* 26 */
266 GG (c
, d
, a
, b
, x
[ 3], S23
, 0xf4d50d87); /* 27 */
267 GG (b
, c
, d
, a
, x
[ 8], S24
, 0x455a14ed); /* 28 */
268 GG (a
, b
, c
, d
, x
[13], S21
, 0xa9e3e905); /* 29 */
269 GG (d
, a
, b
, c
, x
[ 2], S22
, 0xfcefa3f8); /* 30 */
270 GG (c
, d
, a
, b
, x
[ 7], S23
, 0x676f02d9); /* 31 */
271 GG (b
, c
, d
, a
, x
[12], S24
, 0x8d2a4c8a); /* 32 */
274 HH (a
, b
, c
, d
, x
[ 5], S31
, 0xfffa3942); /* 33 */
275 HH (d
, a
, b
, c
, x
[ 8], S32
, 0x8771f681); /* 34 */
276 HH (c
, d
, a
, b
, x
[11], S33
, 0x6d9d6122); /* 35 */
277 HH (b
, c
, d
, a
, x
[14], S34
, 0xfde5380c); /* 36 */
278 HH (a
, b
, c
, d
, x
[ 1], S31
, 0xa4beea44); /* 37 */
279 HH (d
, a
, b
, c
, x
[ 4], S32
, 0x4bdecfa9); /* 38 */
280 HH (c
, d
, a
, b
, x
[ 7], S33
, 0xf6bb4b60); /* 39 */
281 HH (b
, c
, d
, a
, x
[10], S34
, 0xbebfbc70); /* 40 */
282 HH (a
, b
, c
, d
, x
[13], S31
, 0x289b7ec6); /* 41 */
283 HH (d
, a
, b
, c
, x
[ 0], S32
, 0xeaa127fa); /* 42 */
284 HH (c
, d
, a
, b
, x
[ 3], S33
, 0xd4ef3085); /* 43 */
285 HH (b
, c
, d
, a
, x
[ 6], S34
, 0x4881d05); /* 44 */
286 HH (a
, b
, c
, d
, x
[ 9], S31
, 0xd9d4d039); /* 45 */
287 HH (d
, a
, b
, c
, x
[12], S32
, 0xe6db99e5); /* 46 */
288 HH (c
, d
, a
, b
, x
[15], S33
, 0x1fa27cf8); /* 47 */
289 HH (b
, c
, d
, a
, x
[ 2], S34
, 0xc4ac5665); /* 48 */
292 II (a
, b
, c
, d
, x
[ 0], S41
, 0xf4292244); /* 49 */
293 II (d
, a
, b
, c
, x
[ 7], S42
, 0x432aff97); /* 50 */
294 II (c
, d
, a
, b
, x
[14], S43
, 0xab9423a7); /* 51 */
295 II (b
, c
, d
, a
, x
[ 5], S44
, 0xfc93a039); /* 52 */
296 II (a
, b
, c
, d
, x
[12], S41
, 0x655b59c3); /* 53 */
297 II (d
, a
, b
, c
, x
[ 3], S42
, 0x8f0ccc92); /* 54 */
298 II (c
, d
, a
, b
, x
[10], S43
, 0xffeff47d); /* 55 */
299 II (b
, c
, d
, a
, x
[ 1], S44
, 0x85845dd1); /* 56 */
300 II (a
, b
, c
, d
, x
[ 8], S41
, 0x6fa87e4f); /* 57 */
301 II (d
, a
, b
, c
, x
[15], S42
, 0xfe2ce6e0); /* 58 */
302 II (c
, d
, a
, b
, x
[ 6], S43
, 0xa3014314); /* 59 */
303 II (b
, c
, d
, a
, x
[13], S44
, 0x4e0811a1); /* 60 */
304 II (a
, b
, c
, d
, x
[ 4], S41
, 0xf7537e82); /* 61 */
305 II (d
, a
, b
, c
, x
[11], S42
, 0xbd3af235); /* 62 */
306 II (c
, d
, a
, b
, x
[ 2], S43
, 0x2ad7d2bb); /* 63 */
307 II (b
, c
, d
, a
, x
[ 9], S44
, 0xeb86d391); /* 64 */
315 /* Zeroize sensitive information.
317 memset((POINTER
)x
, 0, sizeof (x
));
320 /* Encodes input (UINT4) into output (unsigned char). Assumes len is
324 unsigned char *output
,
330 for (i
= 0, j
= 0; j
< len
; i
++, j
+= 4) {
331 output
[j
] = (unsigned char)(input
[i
] & 0xff);
332 output
[j
+1] = (unsigned char)((input
[i
] >> 8) & 0xff);
333 output
[j
+2] = (unsigned char)((input
[i
] >> 16) & 0xff);
334 output
[j
+3] = (unsigned char)((input
[i
] >> 24) & 0xff);
339 /* Decodes input (unsigned char) into output (UINT4). Assumes len is
344 unsigned char *input
,
349 for (i
= 0, j
= 0; j
< len
; i
++, j
+= 4)
350 output
[i
] = ((UINT4
)input
[j
]) | (((UINT4
)input
[j
+1]) << 8) |
351 (((UINT4
)input
[j
+2]) << 16) | (((UINT4
)input
[j
+3]) << 24);