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) {
139 ((POINTER)&context->buffer[index], (POINTER)input, partLen);
140 MD5Transform (context->state, context->buffer);
142 for (i = partLen; i + 63 < inputLen; i += 64)
143 MD5Transform (context->state, &input[i]);
150 /* Buffer remaining input */
152 ((POINTER)&context->buffer[index], (POINTER)&input[i],
156 /* MD5 finalization. Ends an MD5 message-digest operation, writing the
157 the message digest and zeroizing the context.
159 void MD5Final (digest, context)
160 unsigned char digest[16]; /* message digest */
161 MD5_CTX *context; /* context */
163 unsigned char bits[8];
164 unsigned int index, padLen;
166 /* Save number of bits */
167 Encode (bits, context->count, 8);
169 /* Pad out to 56 mod 64.
171 index = (unsigned int)((context->count[0] >> 3) & 0x3f);
172 padLen = (index < 56) ? (56 - index) : (120 - index);
173 MD5Update (context, PADDING, padLen);
175 /* Append length (before padding) */
176 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.
187 static void MD5Transform (state, block)
189 unsigned char block[64];
191 uint32_t a = state[0], b = state[1], c = state[2], d = state[3], x[16];
193 Decode (x, block, 64);
196 FF (a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */
197 FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */
198 FF (c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */
199 FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */
200 FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */
201 FF (d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */
202 FF (c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */
203 FF (b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */
204 FF (a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */
205 FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */
206 FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */
207 FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */
208 FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */
209 FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */
210 FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */
211 FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 */
214 GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */
215 GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */
216 GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */
217 GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */
218 GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */
219 GG (d, a, b, c, x[10], S22, 0x2441453); /* 22 */
220 GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */
221 GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */
222 GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */
223 GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */
224 GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */
225 GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */
226 GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */
227 GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */
228 GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */
229 GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */
232 HH (a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */
233 HH (d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */
234 HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */
235 HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */
236 HH (a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */
237 HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */
238 HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */
239 HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */
240 HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */
241 HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */
242 HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */
243 HH (b, c, d, a, x[ 6], S34, 0x4881d05); /* 44 */
244 HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */
245 HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */
246 HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */
247 HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */
250 II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */
251 II (d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */
252 II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */
253 II (b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */
254 II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */
255 II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */
256 II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */
257 II (b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */
258 II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */
259 II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */
260 II (c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */
261 II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */
262 II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */
263 II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */
264 II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */
265 II (b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */
272 /* Zeroize sensitive information. */
273 MD5_memset ((POINTER)x, 0, sizeof (x));
276 /* Encodes input (uint32_t) into output (unsigned char). Assumes len is
279 static void Encode (output, input, len)
280 unsigned char *output;
286 for (i = 0, j = 0; j < len; i++, j += 4) {
287 output[j] = (unsigned char)(input[i] & 0xff);
288 output[j+1] = (unsigned char)((input[i] >> 8) & 0xff);
289 output[j+2] = (unsigned char)((input[i] >> 16) & 0xff);
290 output[j+3] = (unsigned char)((input[i] >> 24) & 0xff);
294 /* Decodes input (unsigned char) into output (uint32_t). Assumes len is
297 static void Decode (output, input, len)
299 unsigned char *input;
304 for (i = 0, j = 0; j < len; i++, j += 4)
305 output[i] = ((uint32_t)input[j]) | (((uint32_t)input[j+1]) << 8) |
306 (((uint32_t)input[j+2]) << 16) | (((uint32_t)input[j+3]) << 24);
309 /* Note: Replace "for loop" with standard memcpy if possible.
312 static void MD5_memcpy (output, input, len)
319 for (i = 0; i < len; i++)
320 output[i] = input[i];
323 /* Note: Replace "for loop" with standard memset if possible.
325 static void MD5_memset (output, value, len)
332 for (i = 0; i < len; i++)
333 ((char *)output)[i] = (char)value;