1 /* Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All
4 License to copy and use this software is granted provided that it
5 is identified as the "RSA Data Security, Inc. MD5 Message-Digest
6 Algorithm" in all material mentioning or referencing this software
9 License is also granted to make and use derivative works provided
10 that such works are identified as "derived from the RSA Data
11 Security, Inc. MD5 Message-Digest Algorithm" in all material
12 mentioning or referencing the derived work.
14 RSA Data Security, Inc. makes no representations concerning either
15 the merchantability of this software or the suitability of this
16 software for any particular purpose. It is provided "as is"
17 without express or implied warranty of any kind.
19 These notices must be retained in any copies of any part of this
20 documentation and/or software.
25 /* UINT2 defines a two byte word */
26 typedef unsigned short int UINT2;
28 /* UINT4 defines a four byte word */
29 typedef unsigned long int UINT4;
33 UINT4 state[4]; /* state (ABCD) */
34 UINT4 count[2]; /* number of bits, modulo 2^64 (lsb first) */
35 unsigned char buffer[64]; /* input buffer */
38 static void MD5Init(struct md5_ctx *);
39 static void MD5Update(struct md5_ctx *, unsigned char *, unsigned int);
40 static void MD5Final(unsigned char [16], struct md5_ctx *);
42 /* Constants for MD5Transform routine.
62 static void MD5Transform(UINT4 [4], unsigned char [64]);
63 static void Encode(unsigned char *, UINT4 *, unsigned int);
64 static void Decode(UINT4 *, unsigned char *, unsigned int);
66 #define MD5_memcpy(dst,src,len) memcpy(dst,src,len)
67 #define MD5_memset(dst,val,len) memset(dst,val,len)
69 static unsigned char PADDING[64] = {
70 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
71 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
72 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
75 /* F, G, H and I are basic MD5 functions.
77 #define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
78 #define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
79 #define H(x, y, z) ((x) ^ (y) ^ (z))
80 #define I(x, y, z) ((y) ^ ((x) | (~z)))
82 /* ROTATE_LEFT rotates x left n bits.
84 #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
86 /* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
87 Rotation is separate from addition to prevent recomputation.
89 #define FF(a, b, c, d, x, s, ac) { \
90 (a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \
91 (a) = ROTATE_LEFT ((a), (s)); \
94 #define GG(a, b, c, d, x, s, ac) { \
95 (a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \
96 (a) = ROTATE_LEFT ((a), (s)); \
99 #define HH(a, b, c, d, x, s, ac) { \
100 (a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \
101 (a) = ROTATE_LEFT ((a), (s)); \
104 #define II(a, b, c, d, x, s, ac) { \
105 (a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \
106 (a) = ROTATE_LEFT ((a), (s)); \
110 /* MD5 initialization. Begins an MD5 operation, writing a new context.
112 static void MD5Init (context)
113 struct md5_ctx *context; /* context */
115 context->count[0] = context->count[1] = 0;
116 /* Load magic initialization constants.
118 context->state[0] = 0x67452301;
119 context->state[1] = 0xefcdab89;
120 context->state[2] = 0x98badcfe;
121 context->state[3] = 0x10325476;
124 /* MD5 block update operation. Continues an MD5 message-digest
125 operation, processing another message block, and updating the
128 static void MD5Update (context, input, inputLen)
129 struct md5_ctx *context; /* context */
130 unsigned char *input; /* input block */
131 unsigned int inputLen; /* length of input block */
133 unsigned int i, index, partLen;
135 /* Compute number of bytes mod 64 */
136 index = (unsigned int)((context->count[0] >> 3) & 0x3F);
138 /* Update number of bits */
139 if ((context->count[0] += ((UINT4)inputLen << 3))
140 < ((UINT4)inputLen << 3))
142 context->count[1] += ((UINT4)inputLen >> 29);
144 partLen = 64 - index;
146 /* Transform as many times as possible. */
147 if (inputLen >= partLen) {
148 MD5_memcpy((void *)&context->buffer[index], (void *)input, partLen);
149 MD5Transform(context->state, context->buffer);
151 for (i = partLen; i + 63 < inputLen; i += 64)
152 MD5Transform(context->state, &input[i]);
159 /* Buffer remaining input */
160 MD5_memcpy((void *)&context->buffer[index], (void *)&input[i],
164 /* MD5 finalization. Ends an MD5 message-digest operation, writing the
165 the message digest and zeroizing the context.
167 static void MD5Final (digest, context)
168 unsigned char digest[16]; /* message digest */
169 struct md5_ctx *context; /* context */
171 unsigned char bits[8];
172 unsigned int index, padLen;
174 /* Save number of bits */
175 Encode (bits, context->count, 8);
177 /* Pad out to 56 mod 64. */
178 index = (unsigned int)((context->count[0] >> 3) & 0x3f);
179 padLen = (index < 56) ? (56 - index) : (120 - index);
180 MD5Update (context, PADDING, padLen);
182 /* Append length (before padding) */
183 MD5Update (context, bits, 8);
185 /* Store state in digest */
186 Encode (digest, context->state, 16);
188 /* Zeroize sensitive information. */
189 MD5_memset ((void *)context, 0, sizeof (*context));
192 /* MD5 basic transformation. Transforms state based on block. */
193 static void MD5Transform (state, block)
195 unsigned char block[64];
197 UINT4 a = state[0], b = state[1], c = state[2], d = state[3], x[16];
199 Decode (x, block, 64);
202 FF (a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */
203 FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */
204 FF (c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */
205 FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */
206 FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */
207 FF (d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */
208 FF (c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */
209 FF (b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */
210 FF (a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */
211 FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */
212 FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */
213 FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */
214 FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */
215 FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */
216 FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */
217 FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 */
220 GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */
221 GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */
222 GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */
223 GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */
224 GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */
225 GG (d, a, b, c, x[10], S22, 0x2441453); /* 22 */
226 GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */
227 GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */
228 GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */
229 GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */
230 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. */
279 MD5_memset ((void *)x, 0, sizeof (x));
282 /* Encodes input (UINT4) into output (unsigned char). Assumes len is
285 static void Encode (unsigned char *output,
291 for (i = 0, j = 0; j < len; i++, j += 4) {
292 output[j] = (unsigned char)(input[i] & 0xff);
293 output[j+1] = (unsigned char)((input[i] >> 8) & 0xff);
294 output[j+2] = (unsigned char)((input[i] >> 16) & 0xff);
295 output[j+3] = (unsigned char)((input[i] >> 24) & 0xff);
299 /* Decodes input (unsigned char) into output (UINT4). Assumes len is
302 static void Decode (UINT4 *output,
303 unsigned char *input,
308 for (i = 0, j = 0; j < len; i++, j += 4)
309 output[i] = ((UINT4)input[j]) | (((UINT4)input[j+1]) << 8) |
310 (((UINT4)input[j+2]) << 16) | (((UINT4)input[j+3]) << 24);
313 void Curl_md5it(unsigned char *outbuffer, /* 16 bytes */
314 unsigned char *input)
318 MD5Update(&ctx, input, strlen((char *)input));
319 MD5Final(outbuffer, &ctx);