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1/* derived from the RSA Data Security, Inc. MD5 Message-Digest Algorithm */
2#include <qstring.h>
3#include "qtmd5.h"
4
5typedef unsigned char *POINTER;
6typedef unsigned short int UINT2;
7typedef unsigned long int UINT4;
8
9typedef struct {
10 UINT4 state[4]; // state(ABCD)
11 UINT4 count[2]; // number of bits, modulo 2^64(lsb first)
12 unsigned char buffer[64]; // input buffer
13} MD5_CTX;
14
15static void MD5Init(MD5_CTX *);
16static void MD5Update(MD5_CTX *, unsigned char *, unsigned int);
17static void MD5Final(unsigned char [16], MD5_CTX *);
18static void MD5Transform(UINT4[4], unsigned char[64]);
19static void Encode(unsigned char *, UINT4 *, unsigned int);
20static void Decode(UINT4 *, unsigned char *, unsigned int);
21static void MD5_memset(POINTER, int, unsigned int);
22static void MD5_memcpy(POINTER output,POINTER input,unsigned int len);
23
24// Constants for MD5Transform routine.
25enum {
26 S11 = 7, S12 = 12, S13 = 17, S14 = 22, S21 = 5, S22 = 9, S23 = 14, S24 = 20,
27 S31 = 4, S32 = 11, S33 = 16, S34 = 23, S41 = 6, S42 = 10, S43 = 15, S44 = 21
28};
29
30static unsigned char PADDING[64] = {
31 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
32 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
33 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
34};
35
36// F, G, H and I are basic MD5 functions.
37static inline UINT4 F(UINT4 x, UINT4 y, UINT4 z)
38{
39 return(x & y) |((~x) & z);
40}
41
42static inline UINT4 G(UINT4 x, UINT4 y, UINT4 z)
43{
44 return(x & z) |(y &(~z));
45}
46
47static inline UINT4 H(UINT4 x, UINT4 y, UINT4 z)
48{
49 return x ^ y ^ z;
50}
51
52static inline UINT4 I(UINT4 x, UINT4 y, UINT4 z)
53{
54 return y ^(x |(~z));
55}
56
57static inline UINT4 rotateLeft(UINT4 x, UINT4 n)
58{
59 return(x << n) |(x >>(32-(n)));
60}
61
62// FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
63// Rotation is separate from addition to prevent recomputation.
64static inline void FF(UINT4 &a, UINT4 b, UINT4 c, UINT4 d, UINT4 x, UINT4 s, UINT4 ac)
65{
66 a += F(b, c, d) + x + ac;
67 a = rotateLeft(a, s);
68 a += b;
69}
70
71static inline void GG(UINT4 &a, UINT4 b, UINT4 c, UINT4 d, UINT4 x, UINT4 s, UINT4 ac)
72{
73 a += G(b, c, d) + x +(UINT4)(ac);
74 a = rotateLeft(a, s);
75 a += b;
76}
77
78static inline void HH(UINT4 &a, UINT4 b, UINT4 c, UINT4 d, UINT4 x, UINT4 s, UINT4 ac)
79{
80 a += H(b, c, d) + x +(UINT4)(ac);
81 a = rotateLeft(a, s);
82 a += b;
83}
84
85static inline void II(UINT4 &a, UINT4 b, UINT4 c, UINT4 d, UINT4 x, UINT4 s, UINT4 ac)
86{
87 a += I(b, c, d) + x +(UINT4)(ac);
88 a = rotateLeft(a, s);
89 a += b;
90}
91
92// MD5 initialization. Begins an MD5 operation, writing a new context.
93static void MD5Init(MD5_CTX *context)
94{
95 context->count[0] = context->count[1] = 0;
96
97 // Load magic initialization constants.
98 context->state[0] = 0x67452301;
99 context->state[1] = 0xefcdab89;
100 context->state[2] = 0x98badcfe;
101 context->state[3] = 0x10325476;
102}
103
104// MD5 block update operation. Continues an MD5 message-digest
105// operation, processing another message block, and updating the
106// context.
107static void MD5Update(MD5_CTX *context, unsigned char *input, unsigned int inputLen)
108{
109 unsigned int i, index, partLen;
110 // Compute number of bytes mod 64
111 index =(unsigned int)((context->count[0] >> 3) & 0x3F);
112
113 // Update number of bits
114 if ((context->count[0] +=((UINT4)inputLen << 3)) <((UINT4)inputLen << 3))
115 context->count[1]++;
116
117 context->count[1] +=((UINT4)inputLen >> 29);
118 partLen = 64 - index;
119
120 // Transform as many times as possible.
121 if (inputLen >= partLen) {
122 MD5_memcpy((POINTER)&context->buffer[index],(POINTER)input, partLen);
123 MD5Transform(context->state, context->buffer);
124 for (i = partLen; i + 63 < inputLen; i += 64)
125 MD5Transform(context->state, &input[i]);
126 index = 0;
127 } else {
128 i = 0;
129 }
130
131 // Buffer remaining input
132 MD5_memcpy((POINTER)&context->buffer[index],(POINTER)&input[i],
133 inputLen-i);
134}
135
136// MD5 finalization. Ends an MD5 message-digest operation, writing the
137// the message digest and zeroizing the context.
138static void MD5Final(unsigned char digest[16], MD5_CTX *context)
139{
140 unsigned char bits[8];
141 unsigned int index, padLen;
142
143 // Save number of bits
144 Encode(bits, context->count, 8);
145
146 // Pad out to 56 mod 64.
147 index =(unsigned int)((context->count[0] >> 3) & 0x3f);
148 padLen =(index < 56) ?(56 - index) :(120 - index);
149 MD5Update(context, PADDING, padLen);
150
151 // Append length(before padding)
152 MD5Update(context, bits, 8);
153
154 // Store state in digest
155 Encode(digest, context->state, 16);
156
157 // Zeroize sensitive information.
158 MD5_memset((POINTER)context, 0, sizeof(*context));
159}
160
161// MD5 basic transformation. Transforms state based on block.
162static void MD5Transform(UINT4 state[4], unsigned char block[64])
163{
164 UINT4 a = state[0], b = state[1], c = state[2], d = state[3], x[16];
165 Decode(x, block, 64);
166
167 // Round 1
168 FF(a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */
169 FF(d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */
170 FF(c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */
171 FF(b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */
172 FF(a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */
173 FF(d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */
174 FF(c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */
175 FF(b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */
176 FF(a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */
177 FF(d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */
178 FF(c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */
179 FF(b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */
180 FF(a, b, c, d, x[12], S11, 0x6b901122); /* 13 */
181 FF(d, a, b, c, x[13], S12, 0xfd987193); /* 14 */
182 FF(c, d, a, b, x[14], S13, 0xa679438e); /* 15 */
183 FF(b, c, d, a, x[15], S14, 0x49b40821); /* 16 */
184
185 // Round 2
186 GG(a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */
187 GG(d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */
188 GG(c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */
189 GG(b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */
190 GG(a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */
191 GG(d, a, b, c, x[10], S22, 0x2441453); /* 22 */
192 GG(c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */
193 GG(b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */
194 GG(a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */
195 GG(d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */
196 GG(c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */
197 GG(b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */
198 GG(a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */
199 GG(d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */
200 GG(c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */
201 GG(b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */
202
203 // Round 3
204 HH(a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */
205 HH(d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */
206 HH(c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */
207 HH(b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */
208 HH(a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */
209 HH(d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */
210 HH(c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */
211 HH(b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */
212 HH(a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */
213 HH(d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */
214 HH(c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */
215 HH(b, c, d, a, x[ 6], S34, 0x4881d05); /* 44 */
216 HH(a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */
217 HH(d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */
218 HH(c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */
219 HH(b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */
220
221 // Round 4
222 II(a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */
223 II(d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */
224 II(c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */
225 II(b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */
226 II(a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */
227 II(d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */
228 II(c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */
229 II(b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */
230 II(a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */
231 II(d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */
232 II(c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */
233 II(b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */
234 II(a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */
235 II(d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */
236 II(c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */
237 II(b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */
238 state[0] += a;
239 state[1] += b;
240 state[2] += c;
241 state[3] += d;
242
243 // Zeroize sensitive information.
244 MD5_memset((POINTER)x, 0, sizeof(x));
245}
246
247// Encodes input(UINT4) into output(unsigned char). Assumes len is a
248// multiple of 4.
249static void Encode(unsigned char *output, UINT4 *input, unsigned int len)
250{
251 unsigned int i, j;
252 for (i = 0, j = 0; j < len; i++, j += 4) {
253 output[j] = (unsigned char) (input[i] & 0xff);
254 output[j+1] = (unsigned char) ((input[i] >> 8) & 0xff);
255 output[j+2] = (unsigned char) ((input[i] >> 16) & 0xff);
256 output[j+3] = (unsigned char) ((input[i] >> 24) & 0xff);
257 }
258}
259
260// Decodes input(unsigned char) into output(UINT4). Assumes len is a
261// multiple of 4.
262static void Decode(UINT4 *output, unsigned char *input, unsigned int len)
263{
264 unsigned int i, j;
265 for (i = 0, j = 0; j < len; i++, j += 4)
266 output[i] =((UINT4)input[j]) |(((UINT4)input[j+1]) << 8) |
267 (((UINT4)input[j+2]) << 16) |(((UINT4)input[j+3]) << 24);
268}
269
270// Note: Replace "for loop" with standard memset if possible.
271static void MD5_memset(POINTER output, int value, unsigned int len)
272{
273 unsigned int i;
274 for (i = 0; i < len; i++)
275 ((char *)output)[i] =(char)value;
276}
277
278// Note: Replace "for loop" with standard memcpy if possible.
279static void MD5_memcpy(POINTER output,POINTER input,unsigned int len)
280{
281 unsigned int i;
282 for (i = 0; i < len; i++)
283 output[i] = input[i];
284}
285
286void qtMD5(const QByteArray &src, unsigned char *digest)
287{
288 MD5_CTX context;
289
290 MD5Init(&context);
291 MD5Update(&context, (unsigned char *) src.data(), src.size());
292 MD5Final(digest, &context);
293}
294
295QString qtMD5(const QByteArray &src)
296{
297 unsigned char digest[16];
298 qtMD5(src, digest);
299
300 QString output, tmp;
301 for (int i = 0; i < 16; ++i)
302 output += tmp.sprintf("%02x", digest[i]);
303 return output;
304}