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.
32 /* Constants for MD5Transform routine.
52 static void MD5Transform (uint32_t[4], unsigned char[64]);
53 static void Encode (unsigned char *, uint32_t *, unsigned int);
54 static void Decode (uint32_t *, unsigned char *, unsigned int);
55 static void MD5_memcpy (POINTER, POINTER, unsigned int);
56 static void MD5_memset (POINTER, int, unsigned int);
58 static unsigned char PADDING[64] = {
59 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
60 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
61 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
64 /* F, G, H and I are basic MD5 functions.
66 #define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
67 #define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
68 #define H(x, y, z) ((x) ^ (y) ^ (z))
69 #define I(x, y, z) ((y) ^ ((x) | (~z)))
71 /* ROTATE_LEFT rotates x left n bits.
73 #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
75 /* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
76 Rotation is separate from addition to prevent recomputation.
78 #define FF(a, b, c, d, x, s, ac) { \
79 (a) += F ((b), (c), (d)) + (x) + (uint32_t)(ac); \
80 (a) = ROTATE_LEFT ((a), (s)); \
83 #define GG(a, b, c, d, x, s, ac) { \
84 (a) += G ((b), (c), (d)) + (x) + (uint32_t)(ac); \
85 (a) = ROTATE_LEFT ((a), (s)); \
88 #define HH(a, b, c, d, x, s, ac) { \
89 (a) += H ((b), (c), (d)) + (x) + (uint32_t)(ac); \
90 (a) = ROTATE_LEFT ((a), (s)); \
93 #define II(a, b, c, d, x, s, ac) { \
94 (a) += I ((b), (c), (d)) + (x) + (uint32_t)(ac); \
95 (a) = ROTATE_LEFT ((a), (s)); \
99 /* MD5 initialization. Begins an MD5 operation, writing a new context.
101 void MD5Init (context)
102 MD5_CTX *context; /* context */
104 context->count[0] = context->count[1] = 0;
105 /* Load magic initialization constants.
107 context->state[0] = 0x67452301;
108 context->state[1] = 0xefcdab89;
109 context->state[2] = 0x98badcfe;
110 context->state[3] = 0x10325476;
113 /* MD5 block update operation. Continues an MD5 message-digest
114 operation, processing another message block, and updating the
117 void MD5Update (context, input, inputLen)
118 MD5_CTX *context; /* context */
119 unsigned char *input; /* input block */
120 unsigned int inputLen; /* length of input block */
122 unsigned int i, index, partLen;
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] += ((uint32_t) inputLen << 3))
129 < ((uint32_t) inputLen << 3))
131 context->count[1] += ((uint32_t) inputLen >> 29);
133 partLen = 64 - index;
135 /* Transform as many times as possible.
137 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 */
151 ((POINTER) & context->buffer[index], (POINTER) & input[i], inputLen - i);
154 /* MD5 finalization. Ends an MD5 message-digest operation, writing the
155 the message digest and zeroizing the context.
157 void MD5Final (digest, context)
158 unsigned char digest[16]; /* message digest */
159 MD5_CTX *context; /* context */
161 unsigned char bits[8];
162 unsigned int index, padLen;
164 /* Save number of bits */
165 Encode (bits, context->count, 8);
167 /* Pad out to 56 mod 64.
169 index = (unsigned int) ((context->count[0] >> 3) & 0x3f);
170 padLen = (index < 56) ? (56 - index) : (120 - index);
171 MD5Update (context, PADDING, padLen);
173 /* Append length (before padding) */
174 MD5Update (context, bits, 8);
175 /* Store state in digest */
176 Encode (digest, context->state, 16);
178 /* Zeroize sensitive information.
180 MD5_memset ((POINTER) context, 0, sizeof (*context));
183 /* MD5 basic transformation. Transforms state based on block.
185 static void MD5Transform (state, block)
187 unsigned char block[64];
189 uint32_t a = state[0], b = state[1], c = state[2], d = state[3], x[16];
191 Decode (x, block, 64);
194 FF (a, b, c, d, x[0], S11, 0xd76aa478); /* 1 */
195 FF (d, a, b, c, x[1], S12, 0xe8c7b756); /* 2 */
196 FF (c, d, a, b, x[2], S13, 0x242070db); /* 3 */
197 FF (b, c, d, a, x[3], S14, 0xc1bdceee); /* 4 */
198 FF (a, b, c, d, x[4], S11, 0xf57c0faf); /* 5 */
199 FF (d, a, b, c, x[5], S12, 0x4787c62a); /* 6 */
200 FF (c, d, a, b, x[6], S13, 0xa8304613); /* 7 */
201 FF (b, c, d, a, x[7], S14, 0xfd469501); /* 8 */
202 FF (a, b, c, d, x[8], S11, 0x698098d8); /* 9 */
203 FF (d, a, b, c, x[9], S12, 0x8b44f7af); /* 10 */
204 FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */
205 FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */
206 FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */
207 FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */
208 FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */
209 FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 */
212 GG (a, b, c, d, x[1], S21, 0xf61e2562); /* 17 */
213 GG (d, a, b, c, x[6], S22, 0xc040b340); /* 18 */
214 GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */
215 GG (b, c, d, a, x[0], S24, 0xe9b6c7aa); /* 20 */
216 GG (a, b, c, d, x[5], S21, 0xd62f105d); /* 21 */
217 GG (d, a, b, c, x[10], S22, 0x2441453); /* 22 */
218 GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */
219 GG (b, c, d, a, x[4], S24, 0xe7d3fbc8); /* 24 */
220 GG (a, b, c, d, x[9], S21, 0x21e1cde6); /* 25 */
221 GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */
222 GG (c, d, a, b, x[3], S23, 0xf4d50d87); /* 27 */
223 GG (b, c, d, a, x[8], S24, 0x455a14ed); /* 28 */
224 GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */
225 GG (d, a, b, c, x[2], S22, 0xfcefa3f8); /* 30 */
226 GG (c, d, a, b, x[7], S23, 0x676f02d9); /* 31 */
227 GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */
230 HH (a, b, c, d, x[5], S31, 0xfffa3942); /* 33 */
231 HH (d, a, b, c, x[8], S32, 0x8771f681); /* 34 */
232 HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */
233 HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */
234 HH (a, b, c, d, x[1], S31, 0xa4beea44); /* 37 */
235 HH (d, a, b, c, x[4], S32, 0x4bdecfa9); /* 38 */
236 HH (c, d, a, b, x[7], S33, 0xf6bb4b60); /* 39 */
237 HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */
238 HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */
239 HH (d, a, b, c, x[0], S32, 0xeaa127fa); /* 42 */
240 HH (c, d, a, b, x[3], S33, 0xd4ef3085); /* 43 */
241 HH (b, c, d, a, x[6], S34, 0x4881d05); /* 44 */
242 HH (a, b, c, d, x[9], S31, 0xd9d4d039); /* 45 */
243 HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */
244 HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */
245 HH (b, c, d, a, x[2], S34, 0xc4ac5665); /* 48 */
248 II (a, b, c, d, x[0], S41, 0xf4292244); /* 49 */
249 II (d, a, b, c, x[7], S42, 0x432aff97); /* 50 */
250 II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */
251 II (b, c, d, a, x[5], S44, 0xfc93a039); /* 52 */
252 II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */
253 II (d, a, b, c, x[3], S42, 0x8f0ccc92); /* 54 */
254 II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */
255 II (b, c, d, a, x[1], S44, 0x85845dd1); /* 56 */
256 II (a, b, c, d, x[8], S41, 0x6fa87e4f); /* 57 */
257 II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */
258 II (c, d, a, b, x[6], S43, 0xa3014314); /* 59 */
259 II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */
260 II (a, b, c, d, x[4], S41, 0xf7537e82); /* 61 */
261 II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */
262 II (c, d, a, b, x[2], S43, 0x2ad7d2bb); /* 63 */
263 II (b, c, d, a, x[9], S44, 0xeb86d391); /* 64 */
270 /* Zeroize sensitive information. */
271 MD5_memset ((POINTER) x, 0, sizeof (x));
274 /* Encodes input (uint32_t) into output (unsigned char). Assumes len is
277 static void Encode (output, input, len)
278 unsigned char *output;
284 for (i = 0, j = 0; j < len; i++, j += 4) {
285 output[j] = (unsigned char) (input[i] & 0xff);
286 output[j + 1] = (unsigned char) ((input[i] >> 8) & 0xff);
287 output[j + 2] = (unsigned char) ((input[i] >> 16) & 0xff);
288 output[j + 3] = (unsigned char) ((input[i] >> 24) & 0xff);
292 /* Decodes input (unsigned char) into output (uint32_t). Assumes len is
295 static void Decode (output, input, len)
297 unsigned char *input;
302 for (i = 0, j = 0; j < len; i++, j += 4)
303 output[i] = ((uint32_t) input[j]) | (((uint32_t) input[j + 1]) << 8) |
304 (((uint32_t) input[j + 2]) << 16) | (((uint32_t) input[j + 3]) << 24);
307 /* Note: Replace "for loop" with standard memcpy if possible.
310 static void MD5_memcpy (output, input, len)
317 for (i = 0; i < len; i++)
318 output[i] = input[i];
321 /* Note: Replace "for loop" with standard memset if possible.
323 static void MD5_memset (output, value, len)
330 for (i = 0; i < len; i++)
331 ((char *) output)[i] = (char) value;