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.
29 /* Constants for MD5Transform routine.
48 static void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
49 static void Encode PROTO_LIST
50 ((unsigned char *, UINT4 *, unsigned int));
51 static void Decode PROTO_LIST
52 ((UINT4 *, unsigned char *, unsigned int));
53 static void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
54 static void MD5_memset PROTO_LIST ((POINTER, int, unsigned int));
56 static unsigned char PADDING[64] = {
57 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
58 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
59 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
62 /* F, G, H and I are basic MD5 functions.
64 #define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
65 #define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
66 #define H(x, y, z) ((x) ^ (y) ^ (z))
67 #define I(x, y, z) ((y) ^ ((x) | (~z)))
69 /* ROTATE_LEFT rotates x left n bits.
71 #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
73 /* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
74 Rotation is separate from addition to prevent recomputation.
76 #define FF(a, b, c, d, x, s, ac) { \
77 (a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \
78 (a) = ROTATE_LEFT ((a), (s)); \
81 #define GG(a, b, c, d, x, s, ac) { \
82 (a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \
83 (a) = ROTATE_LEFT ((a), (s)); \
86 #define HH(a, b, c, d, x, s, ac) { \
87 (a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \
88 (a) = ROTATE_LEFT ((a), (s)); \
91 #define II(a, b, c, d, x, s, ac) { \
92 (a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \
93 (a) = ROTATE_LEFT ((a), (s)); \
97 /* MD5 initialization. Begins an MD5 operation, writing a new context.
101 MD5_CTX *context /* context */
104 context->count[0] = context->count[1] = 0;
106 /* Load magic initialization constants.
108 context->state[0] = 0x67452301;
109 context->state[1] = 0xefcdab89;
110 context->state[2] = 0x98badcfe;
111 context->state[3] = 0x10325476;
114 /* MD5 block update operation. Continues an MD5 message-digest
115 operation, processing another message block, and updating the
120 MD5_CTX *context, /* context */
121 unsigned char *input, /* input block */
122 unsigned int inputLen /* length of input block */
125 unsigned int i, index, partLen;
127 /* Compute number of bytes mod 64 */
128 index = (unsigned int)((context->count[0] >> 3) & 0x3F);
130 /* Update number of bits */
131 if ((context->count[0] += ((UINT4)inputLen << 3))
132 < ((UINT4)inputLen << 3))
134 context->count[1] += ((UINT4)inputLen >> 29);
136 partLen = 64 - index;
138 /* Transform as many times as possible.
140 if (inputLen >= partLen) {
142 ((POINTER)&context->buffer[index], (POINTER)input, partLen);
143 MD5Transform (context->state, context->buffer);
145 for (i = partLen; i + 63 < inputLen; i += 64)
146 MD5Transform (context->state, &input[i]);
153 /* Buffer remaining input */
155 ((POINTER)&context->buffer[index], (POINTER)&input[i],
159 /* MD5 finalization. Ends an MD5 message-digest operation, writing the
160 the message digest and zeroizing the context.
164 unsigned char digest[16], /* message digest */
165 MD5_CTX *context /* context */
168 unsigned char bits[8];
169 unsigned int index, padLen;
171 /* Save number of bits */
172 Encode (bits, context->count, 8);
174 /* Pad out to 56 mod 64.
176 index = (unsigned int)((context->count[0] >> 3) & 0x3f);
177 padLen = (index < 56) ? (56 - index) : (120 - index);
178 MD5Update (context, PADDING, padLen);
180 /* Append length (before padding) */
181 MD5Update (context, bits, 8);
183 /* Store state in digest */
184 Encode (digest, context->state, 16);
186 /* Zeroize sensitive information.
188 MD5_memset ((POINTER)context, 0, sizeof (*context));
191 /* MD5 basic transformation. Transforms state based on block.
196 unsigned char block[64]
199 UINT4 a = state[0], b = state[1], c = state[2], d = state[3], x[16];
201 Decode (x, block, 64);
204 FF (a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */
205 FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */
206 FF (c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */
207 FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */
208 FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */
209 FF (d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */
210 FF (c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */
211 FF (b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */
212 FF (a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */
213 FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */
214 FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */
215 FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */
216 FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */
217 FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */
218 FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */
219 FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 */
222 GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */
223 GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */
224 GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */
225 GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */
226 GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */
227 GG (d, a, b, c, x[10], S22, 0x2441453); /* 22 */
228 GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */
229 GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */
230 GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */
231 GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */
232 GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */
233 GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */
234 GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */
235 GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */
236 GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */
237 GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */
240 HH (a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */
241 HH (d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */
242 HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */
243 HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */
244 HH (a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */
245 HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */
246 HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */
247 HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */
248 HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */
249 HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */
250 HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */
251 HH (b, c, d, a, x[ 6], S34, 0x4881d05); /* 44 */
252 HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */
253 HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */
254 HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */
255 HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */
258 II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */
259 II (d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */
260 II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */
261 II (b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */
262 II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */
263 II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */
264 II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */
265 II (b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */
266 II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */
267 II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */
268 II (c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */
269 II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */
270 II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */
271 II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */
272 II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */
273 II (b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */
280 /* Zeroize sensitive information.
282 MD5_memset ((POINTER)x, 0, sizeof (x));
285 /* Encodes input (UINT4) into output (unsigned char). Assumes len is
290 unsigned char *output,
297 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
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) |
319 (((UINT4)input[j+2]) << 16) | (((UINT4)input[j+3]) << 24);
322 /* Note: Replace "for loop" with standard memcpy if possible.
333 for (i = 0; i < len; i++)
334 output[i] = input[i];
337 /* Note: Replace "for loop" with standard memset if possible.
348 for (i = 0; i < len; i++)
349 ((char *)output)[i] = (char)value;