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. */
47 static void MD5Transform (uint32_t[4], unsigned char[64]);
48 static void Encode (unsigned char *, uint32_t *, unsigned int);
49 static void Decode (uint32_t *, unsigned char *, unsigned int);
50 static void MD5_memcpy (unsigned char *, unsigned char *, unsigned int);
51 static void MD5_memset (unsigned char *, int, unsigned int);
53 static unsigned char PADDING[64] = {
54 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
55 0, 0, 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
59 /* F, G, H and I are basic MD5 functions.
61 #define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
62 #define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
63 #define H(x, y, z) ((x) ^ (y) ^ (z))
64 #define I(x, y, z) ((y) ^ ((x) | (~z)))
66 /* ROTATE_LEFT rotates x left n bits.
68 #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
70 /* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
71 Rotation is separate from addition to prevent recomputation.
73 #define FF(a, b, c, d, x, s, ac) { \
74 (a) += F ((b), (c), (d)) + (x) + (uint32_t)(ac); \
75 (a) = ROTATE_LEFT ((a), (s)); \
78 #define GG(a, b, c, d, x, s, ac) { \
79 (a) += G ((b), (c), (d)) + (x) + (uint32_t)(ac); \
80 (a) = ROTATE_LEFT ((a), (s)); \
83 #define HH(a, b, c, d, x, s, ac) { \
84 (a) += H ((b), (c), (d)) + (x) + (uint32_t)(ac); \
85 (a) = ROTATE_LEFT ((a), (s)); \
88 #define II(a, b, c, d, x, s, ac) { \
89 (a) += I ((b), (c), (d)) + (x) + (uint32_t)(ac); \
90 (a) = ROTATE_LEFT ((a), (s)); \
94 /* MD5 initialization. Begins an MD5 operation, writing a new context.
96 void MD5Init (context)
97 MD5_CTX *context; /* context */
99 context->count[0] = context->count[1] = 0;
100 /* Load magic initialization constants.
102 context->state[0] = 0x67452301;
103 context->state[1] = 0xefcdab89;
104 context->state[2] = 0x98badcfe;
105 context->state[3] = 0x10325476;
108 /* MD5 block update operation. Continues an MD5 message-digest
109 operation, processing another message block, and updating the
112 void MD5Update (context, input, inputLen)
113 MD5_CTX *context; /* context */
114 unsigned char *input; /* input block */
115 unsigned int inputLen; /* length of input block */
117 unsigned int i, idx, partLen;
119 /* Compute number of bytes mod 64 */
120 idx = (unsigned int) ((context->count[0] >> 3) & 0x3F);
122 /* Update number of bits */
123 if ((context->count[0] += ((uint32_t) inputLen << 3))
124 < ((uint32_t) inputLen << 3))
126 context->count[1] += ((uint32_t) inputLen >> 29);
130 /* Transform as many times as possible.
132 if (inputLen >= partLen) {
133 MD5_memcpy ((unsigned char *) & context->buffer[idx], (unsigned char *) input, partLen);
134 MD5Transform (context->state, context->buffer);
136 for (i = partLen; i + 63 < inputLen; i += 64)
137 MD5Transform (context->state, &input[i]);
144 /* Buffer remaining input */
146 ((unsigned char *) & context->buffer[idx], (unsigned char *) & input[i], inputLen - i);
149 /* MD5 finalization. Ends an MD5 message-digest operation, writing the
150 the message digest and zeroizing the context.
152 void MD5Final (digest, context)
153 unsigned char digest[16]; /* message digest */
154 MD5_CTX *context; /* context */
156 unsigned char bits[8];
157 unsigned int idx, padLen;
159 /* Save number of bits */
160 Encode (bits, context->count, 8);
162 /* Pad out to 56 mod 64.
164 idx = (unsigned int) ((context->count[0] >> 3) & 0x3f);
165 padLen = (idx < 56) ? (56 - idx) : (120 - idx);
166 MD5Update (context, PADDING, padLen);
168 /* Append length (before padding) */
169 MD5Update (context, bits, 8);
170 /* Store state in digest */
171 Encode (digest, context->state, 16);
173 /* Zeroize sensitive information.
175 MD5_memset ((unsigned char *) context, 0, sizeof (*context));
178 /* MD5 basic transformation. Transforms state based on block.
180 static void MD5Transform (state, block)
182 unsigned char block[64];
184 uint32_t a = state[0], b = state[1], c = state[2], d = state[3], x[16];
186 Decode (x, block, 64);
189 FF (a, b, c, d, x[0], S11, 0xd76aa478); /* 1 */
190 FF (d, a, b, c, x[1], S12, 0xe8c7b756); /* 2 */
191 FF (c, d, a, b, x[2], S13, 0x242070db); /* 3 */
192 FF (b, c, d, a, x[3], S14, 0xc1bdceee); /* 4 */
193 FF (a, b, c, d, x[4], S11, 0xf57c0faf); /* 5 */
194 FF (d, a, b, c, x[5], S12, 0x4787c62a); /* 6 */
195 FF (c, d, a, b, x[6], S13, 0xa8304613); /* 7 */
196 FF (b, c, d, a, x[7], S14, 0xfd469501); /* 8 */
197 FF (a, b, c, d, x[8], S11, 0x698098d8); /* 9 */
198 FF (d, a, b, c, x[9], S12, 0x8b44f7af); /* 10 */
199 FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */
200 FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */
201 FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */
202 FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */
203 FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */
204 FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 */
207 GG (a, b, c, d, x[1], S21, 0xf61e2562); /* 17 */
208 GG (d, a, b, c, x[6], S22, 0xc040b340); /* 18 */
209 GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */
210 GG (b, c, d, a, x[0], S24, 0xe9b6c7aa); /* 20 */
211 GG (a, b, c, d, x[5], S21, 0xd62f105d); /* 21 */
212 GG (d, a, b, c, x[10], S22, 0x2441453); /* 22 */
213 GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */
214 GG (b, c, d, a, x[4], S24, 0xe7d3fbc8); /* 24 */
215 GG (a, b, c, d, x[9], S21, 0x21e1cde6); /* 25 */
216 GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */
217 GG (c, d, a, b, x[3], S23, 0xf4d50d87); /* 27 */
218 GG (b, c, d, a, x[8], S24, 0x455a14ed); /* 28 */
219 GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */
220 GG (d, a, b, c, x[2], S22, 0xfcefa3f8); /* 30 */
221 GG (c, d, a, b, x[7], S23, 0x676f02d9); /* 31 */
222 GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */
225 HH (a, b, c, d, x[5], S31, 0xfffa3942); /* 33 */
226 HH (d, a, b, c, x[8], S32, 0x8771f681); /* 34 */
227 HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */
228 HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */
229 HH (a, b, c, d, x[1], S31, 0xa4beea44); /* 37 */
230 HH (d, a, b, c, x[4], S32, 0x4bdecfa9); /* 38 */
231 HH (c, d, a, b, x[7], S33, 0xf6bb4b60); /* 39 */
232 HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */
233 HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */
234 HH (d, a, b, c, x[0], S32, 0xeaa127fa); /* 42 */
235 HH (c, d, a, b, x[3], S33, 0xd4ef3085); /* 43 */
236 HH (b, c, d, a, x[6], S34, 0x4881d05); /* 44 */
237 HH (a, b, c, d, x[9], S31, 0xd9d4d039); /* 45 */
238 HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */
239 HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */
240 HH (b, c, d, a, x[2], S34, 0xc4ac5665); /* 48 */
243 II (a, b, c, d, x[0], S41, 0xf4292244); /* 49 */
244 II (d, a, b, c, x[7], S42, 0x432aff97); /* 50 */
245 II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */
246 II (b, c, d, a, x[5], S44, 0xfc93a039); /* 52 */
247 II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */
248 II (d, a, b, c, x[3], S42, 0x8f0ccc92); /* 54 */
249 II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */
250 II (b, c, d, a, x[1], S44, 0x85845dd1); /* 56 */
251 II (a, b, c, d, x[8], S41, 0x6fa87e4f); /* 57 */
252 II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */
253 II (c, d, a, b, x[6], S43, 0xa3014314); /* 59 */
254 II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */
255 II (a, b, c, d, x[4], S41, 0xf7537e82); /* 61 */
256 II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */
257 II (c, d, a, b, x[2], S43, 0x2ad7d2bb); /* 63 */
258 II (b, c, d, a, x[9], S44, 0xeb86d391); /* 64 */
265 /* Zeroize sensitive information. */
266 MD5_memset ((unsigned char *) x, 0, sizeof (x));
269 /* Encodes input (uint32_t) into output (unsigned char). Assumes len is
272 static void Encode (output, input, len)
273 unsigned char *output;
279 for (i = 0, j = 0; j < len; i++, j += 4) {
280 output[j] = (unsigned char) (input[i] & 0xff);
281 output[j + 1] = (unsigned char) ((input[i] >> 8) & 0xff);
282 output[j + 2] = (unsigned char) ((input[i] >> 16) & 0xff);
283 output[j + 3] = (unsigned char) ((input[i] >> 24) & 0xff);
287 /* Decodes input (unsigned char) into output (uint32_t). Assumes len is
290 static void Decode (output, input, len)
292 unsigned char *input;
297 for (i = 0, j = 0; j < len; i++, j += 4)
298 output[i] = ((uint32_t) input[j]) | (((uint32_t) input[j + 1]) << 8) |
299 (((uint32_t) input[j + 2]) << 16) | (((uint32_t) input[j + 3]) << 24);
302 /* Note: Replace "for loop" with standard memcpy if possible.
305 static void MD5_memcpy (output, input, len)
306 unsigned char * output;
307 unsigned char * input;
312 for (i = 0; i < len; i++)
313 output[i] = input[i];
316 /* Note: Replace "for loop" with standard memset if possible.
318 static void MD5_memset (output, value, len)
319 unsigned char * output;
325 for (i = 0; i < len; i++)
326 ((char *) output)[i] = (char) value;