e0691c89faf08b51dda48ba5f580db3f12d6289b
1 /* 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.
28 /* Constants for MD5Transform routine.
48 static void MD5Transform
PROTO_LIST((UINT4
[4], unsigned char[64]));
49 static void Encode
PROTO_LIST((unsigned char *, UINT4
*, unsigned int));
50 static void Decode
PROTO_LIST((UINT4
*, unsigned char *, unsigned int));
51 static void MD5_memcpy
PROTO_LIST((POINTER
, POINTER
, unsigned int));
52 static void MD5_memset
PROTO_LIST((POINTER
, int, unsigned int));
54 static unsigned char PADDING
[64] = {
55 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
56 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
57 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
60 /* F, G, H and I are basic MD5 functions.
62 #define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
63 #define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
64 #define H(x, y, z) ((x) ^ (y) ^ (z))
65 #define I(x, y, z) ((y) ^ ((x) | (~z)))
67 /* ROTATE_LEFT rotates x left n bits.
69 #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
71 /* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
72 Rotation is separate from addition to prevent recomputation.
74 #define FF(a, b, c, d, x, s, ac) { \
75 (a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \
76 (a) = ROTATE_LEFT ((a), (s)); \
79 #define GG(a, b, c, d, x, s, ac) { \
80 (a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \
81 (a) = ROTATE_LEFT ((a), (s)); \
84 #define HH(a, b, c, d, x, s, ac) { \
85 (a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \
86 (a) = ROTATE_LEFT ((a), (s)); \
89 #define II(a, b, c, d, x, s, ac) { \
90 (a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \
91 (a) = ROTATE_LEFT ((a), (s)); \
95 /* MD5 initialization. Begins an MD5 operation, writing a new context.
99 MD5_CTX
*context
; /* context */
101 context
->count
[0] = context
->count
[1] = 0;
102 /* Load magic initialization constants.
104 context
->state
[0] = 0x67452301;
105 context
->state
[1] = 0xefcdab89;
106 context
->state
[2] = 0x98badcfe;
107 context
->state
[3] = 0x10325476;
110 /* MD5 block update operation. Continues an MD5 message-digest
111 operation, processing another message block, and updating the
115 MD5Update(context
, input
, inputLen
)
116 MD5_CTX
*context
; /* context */
117 unsigned char *input
; /* input block */
118 unsigned int inputLen
; /* length of input block */
124 /* Compute number of bytes mod 64 */
125 index
= (unsigned int) ((context
->count
[0] >> 3) & 0x3F);
127 /* Update number of bits */
128 if ((context
->count
[0] += ((UINT4
) inputLen
<< 3)) < ((UINT4
) inputLen
<< 3))
130 context
->count
[1] += ((UINT4
) inputLen
>> 29);
132 partLen
= 64 - index
;
134 /* Transform as many times as possible.
136 if (inputLen
>= partLen
)
138 MD5_memcpy((POINTER
) & context
->buffer
[index
], (POINTER
) input
, partLen
);
139 MD5Transform(context
->state
, context
->buffer
);
141 for (i
= partLen
; i
+ 63 < inputLen
; i
+= 64)
142 MD5Transform(context
->state
, &input
[i
]);
149 /* Buffer remaining input */
150 MD5_memcpy((POINTER
) & context
->buffer
[index
], (POINTER
) & input
[i
], inputLen
- i
);
153 /* MD5 finalization. Ends an MD5 message-digest operation, writing the
154 the message digest and zeroizing the context.
157 MD5Final(digest
, context
)
158 unsigned char digest
[16]; /* message digest */
159 MD5_CTX
*context
; /* context */
161 unsigned char bits
[8];
165 /* Save number of bits */
166 Encode(bits
, context
->count
, 8);
168 /* Pad out to 56 mod 64.
170 index
= (unsigned int) ((context
->count
[0] >> 3) & 0x3f);
171 padLen
= (index
< 56) ? (56 - index
) : (120 - index
);
172 MD5Update(context
, PADDING
, padLen
);
174 /* Append length (before padding) */
175 MD5Update(context
, bits
, 8);
177 /* Store state in digest */
178 Encode(digest
, context
->state
, 16);
180 /* Zeroize sensitive information.
182 MD5_memset((POINTER
) context
, 0, sizeof(*context
));
185 /* MD5 basic transformation. Transforms state based on block.
188 MD5Transform(state
, block
)
190 unsigned char block
[64];
198 Decode(x
, block
, 64);
201 FF(a
, b
, c
, d
, x
[0], S11
, 0xd76aa478); /* 1 */
202 FF(d
, a
, b
, c
, x
[1], S12
, 0xe8c7b756); /* 2 */
203 FF(c
, d
, a
, b
, x
[2], S13
, 0x242070db); /* 3 */
204 FF(b
, c
, d
, a
, x
[3], S14
, 0xc1bdceee); /* 4 */
205 FF(a
, b
, c
, d
, x
[4], S11
, 0xf57c0faf); /* 5 */
206 FF(d
, a
, b
, c
, x
[5], S12
, 0x4787c62a); /* 6 */
207 FF(c
, d
, a
, b
, x
[6], S13
, 0xa8304613); /* 7 */
208 FF(b
, c
, d
, a
, x
[7], S14
, 0xfd469501); /* 8 */
209 FF(a
, b
, c
, d
, x
[8], S11
, 0x698098d8); /* 9 */
210 FF(d
, a
, b
, c
, x
[9], S12
, 0x8b44f7af); /* 10 */
211 FF(c
, d
, a
, b
, x
[10], S13
, 0xffff5bb1); /* 11 */
212 FF(b
, c
, d
, a
, x
[11], S14
, 0x895cd7be); /* 12 */
213 FF(a
, b
, c
, d
, x
[12], S11
, 0x6b901122); /* 13 */
214 FF(d
, a
, b
, c
, x
[13], S12
, 0xfd987193); /* 14 */
215 FF(c
, d
, a
, b
, x
[14], S13
, 0xa679438e); /* 15 */
216 FF(b
, c
, d
, a
, x
[15], S14
, 0x49b40821); /* 16 */
219 GG(a
, b
, c
, d
, x
[1], S21
, 0xf61e2562); /* 17 */
220 GG(d
, a
, b
, c
, x
[6], S22
, 0xc040b340); /* 18 */
221 GG(c
, d
, a
, b
, x
[11], S23
, 0x265e5a51); /* 19 */
222 GG(b
, c
, d
, a
, x
[0], S24
, 0xe9b6c7aa); /* 20 */
223 GG(a
, b
, c
, d
, x
[5], S21
, 0xd62f105d); /* 21 */
224 GG(d
, a
, b
, c
, x
[10], S22
, 0x2441453); /* 22 */
225 GG(c
, d
, a
, b
, x
[15], S23
, 0xd8a1e681); /* 23 */
226 GG(b
, c
, d
, a
, x
[4], S24
, 0xe7d3fbc8); /* 24 */
227 GG(a
, b
, c
, d
, x
[9], S21
, 0x21e1cde6); /* 25 */
228 GG(d
, a
, b
, c
, x
[14], S22
, 0xc33707d6); /* 26 */
229 GG(c
, d
, a
, b
, x
[3], S23
, 0xf4d50d87); /* 27 */
231 GG(b
, c
, d
, a
, x
[8], S24
, 0x455a14ed); /* 28 */
232 GG(a
, b
, c
, d
, x
[13], S21
, 0xa9e3e905); /* 29 */
233 GG(d
, a
, b
, c
, x
[2], S22
, 0xfcefa3f8); /* 30 */
234 GG(c
, d
, a
, b
, x
[7], S23
, 0x676f02d9); /* 31 */
235 GG(b
, c
, d
, a
, x
[12], S24
, 0x8d2a4c8a); /* 32 */
238 HH(a
, b
, c
, d
, x
[5], S31
, 0xfffa3942); /* 33 */
239 HH(d
, a
, b
, c
, x
[8], S32
, 0x8771f681); /* 34 */
240 HH(c
, d
, a
, b
, x
[11], S33
, 0x6d9d6122); /* 35 */
241 HH(b
, c
, d
, a
, x
[14], S34
, 0xfde5380c); /* 36 */
242 HH(a
, b
, c
, d
, x
[1], S31
, 0xa4beea44); /* 37 */
243 HH(d
, a
, b
, c
, x
[4], S32
, 0x4bdecfa9); /* 38 */
244 HH(c
, d
, a
, b
, x
[7], S33
, 0xf6bb4b60); /* 39 */
245 HH(b
, c
, d
, a
, x
[10], S34
, 0xbebfbc70); /* 40 */
246 HH(a
, b
, c
, d
, x
[13], S31
, 0x289b7ec6); /* 41 */
247 HH(d
, a
, b
, c
, x
[0], S32
, 0xeaa127fa); /* 42 */
248 HH(c
, d
, a
, b
, x
[3], S33
, 0xd4ef3085); /* 43 */
249 HH(b
, c
, d
, a
, x
[6], S34
, 0x4881d05); /* 44 */
250 HH(a
, b
, c
, d
, x
[9], S31
, 0xd9d4d039); /* 45 */
251 HH(d
, a
, b
, c
, x
[12], S32
, 0xe6db99e5); /* 46 */
252 HH(c
, d
, a
, b
, x
[15], S33
, 0x1fa27cf8); /* 47 */
253 HH(b
, c
, d
, a
, x
[2], S34
, 0xc4ac5665); /* 48 */
256 II(a
, b
, c
, d
, x
[0], S41
, 0xf4292244); /* 49 */
257 II(d
, a
, b
, c
, x
[7], S42
, 0x432aff97); /* 50 */
258 II(c
, d
, a
, b
, x
[14], S43
, 0xab9423a7); /* 51 */
259 II(b
, c
, d
, a
, x
[5], S44
, 0xfc93a039); /* 52 */
260 II(a
, b
, c
, d
, x
[12], S41
, 0x655b59c3); /* 53 */
261 II(d
, a
, b
, c
, x
[3], S42
, 0x8f0ccc92); /* 54 */
262 II(c
, d
, a
, b
, x
[10], S43
, 0xffeff47d); /* 55 */
263 II(b
, c
, d
, a
, x
[1], S44
, 0x85845dd1); /* 56 */
264 II(a
, b
, c
, d
, x
[8], S41
, 0x6fa87e4f); /* 57 */
265 II(d
, a
, b
, c
, x
[15], S42
, 0xfe2ce6e0); /* 58 */
266 II(c
, d
, a
, b
, x
[6], S43
, 0xa3014314); /* 59 */
267 II(b
, c
, d
, a
, x
[13], S44
, 0x4e0811a1); /* 60 */
268 II(a
, b
, c
, d
, x
[4], S41
, 0xf7537e82); /* 61 */
269 II(d
, a
, b
, c
, x
[11], S42
, 0xbd3af235); /* 62 */
270 II(c
, d
, a
, b
, x
[2], S43
, 0x2ad7d2bb); /* 63 */
271 II(b
, c
, d
, a
, x
[9], S44
, 0xeb86d391); /* 64 */
278 /* Zeroize sensitive information.
281 MD5_memset((POINTER
) x
, 0, sizeof(x
));
284 /* Encodes input (UINT4) into output (unsigned char). Assumes len is
288 Encode(output
, input
, len
)
289 unsigned char *output
;
296 for (i
= 0, j
= 0; j
< len
; i
++, j
+= 4)
298 output
[j
] = (unsigned char) (input
[i
] & 0xff);
299 output
[j
+ 1] = (unsigned char) ((input
[i
] >> 8) & 0xff);
300 output
[j
+ 2] = (unsigned char) ((input
[i
] >> 16) & 0xff);
301 output
[j
+ 3] = (unsigned char) ((input
[i
] >> 24) & 0xff);
305 /* Decodes input (unsigned char) into output (UINT4). Assumes len is
309 Decode(output
, input
, len
)
311 unsigned char *input
;
317 for (i
= 0, j
= 0; j
< len
; i
++, j
+= 4)
318 output
[i
] = ((UINT4
) input
[j
]) | (((UINT4
) input
[j
+ 1]) << 8) | (((UINT4
) input
[j
+ 2]) << 16) | (((UINT4
) input
[j
+ 3]) << 24);
321 /* Note: Replace "for loop" with standard memcpy if possible.
325 MD5_memcpy(output
, input
, len
)
332 for (i
= 0; i
< len
; i
++)
334 output
[i
] = input
[i
];
337 /* Note: Replace "for loop" with standard memset if possible.
340 MD5_memset(output
, value
, len
)
347 for (i
= 0; i
< len
; i
++)
348 ((char *) output
)[i
] = (char) value
;