1 //---------------------------------------------------------------------------------
2 //
3 // Little Color Management System
4 // Copyright (c) 1998-2012 Marti Maria Saguer
5 //
6 // Permission is hereby granted, free of charge, to any person obtaining
7 // a copy of this software and associated documentation files (the "Software"),
8 // to deal in the Software without restriction, including without limitation
9 // the rights to use, copy, modify, merge, publish, distribute, sublicense,
10 // and/or sell copies of the Software, and to permit persons to whom the Software
11 // is furnished to do so, subject to the following conditions:
12 //
13 // The above copyright notice and this permission notice shall be included in
14 // all copies or substantial portions of the Software.
15 //
16 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
17 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO
18 // THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
19 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
20 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
21 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
22 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
23 //
24 //---------------------------------------------------------------------------------
25
26 #include "lcms2_internal.h"
27
28 #ifdef CMS_USE_BIG_ENDIAN
29
30 static
byteReverse(cmsUInt8Number * buf,cmsUInt32Number longs)31 void byteReverse(cmsUInt8Number * buf, cmsUInt32Number longs)
32 {
33 do {
34
35 cmsUInt32Number t = _cmsAdjustEndianess32(*(cmsUInt32Number *) buf);
36 *(cmsUInt32Number *) buf = t;
37 buf += sizeof(cmsUInt32Number);
38
39 } while (--longs);
40
41 }
42
43 #else
44 #define byteReverse(buf, len)
45 #endif
46
47
48 typedef struct {
49
50 cmsUInt32Number buf[4];
51 cmsUInt32Number bits[2];
52 cmsUInt8Number in[64];
53 cmsContext ContextID;
54
55 } _cmsMD5;
56
57 #define F1(x, y, z) (z ^ (x & (y ^ z)))
58 #define F2(x, y, z) F1(z, x, y)
59 #define F3(x, y, z) (x ^ y ^ z)
60 #define F4(x, y, z) (y ^ (x | ~z))
61
62 #define STEP(f, w, x, y, z, data, s) \
63 ( w += f(x, y, z) + data, w = w<<s | w>>(32-s), w += x )
64
65
66 static
MD5_Transform(cmsUInt32Number buf[4],cmsUInt32Number in[16])67 void MD5_Transform(cmsUInt32Number buf[4], cmsUInt32Number in[16])
68
69 {
70 register cmsUInt32Number a, b, c, d;
71
72 a = buf[0];
73 b = buf[1];
74 c = buf[2];
75 d = buf[3];
76
77 STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7);
78 STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12);
79 STEP(F1, c, d, a, b, in[2] + 0x242070db, 17);
80 STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22);
81 STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7);
82 STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12);
83 STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17);
84 STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22);
85 STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7);
86 STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12);
87 STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17);
88 STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22);
89 STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7);
90 STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12);
91 STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17);
92 STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22);
93
94 STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5);
95 STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9);
96 STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14);
97 STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);
98 STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5);
99 STEP(F2, d, a, b, c, in[10] + 0x02441453, 9);
100 STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14);
101 STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);
102 STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5);
103 STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9);
104 STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14);
105 STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20);
106 STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5);
107 STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);
108 STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14);
109 STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);
110
111 STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4);
112 STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11);
113 STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16);
114 STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23);
115 STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4);
116 STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);
117 STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);
118 STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23);
119 STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4);
120 STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11);
121 STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16);
122 STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23);
123 STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4);
124 STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11);
125 STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
126 STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23);
127
128 STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6);
129 STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10);
130 STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15);
131 STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21);
132 STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6);
133 STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);
134 STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15);
135 STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21);
136 STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);
137 STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
138 STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15);
139 STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
140 STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6);
141 STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10);
142 STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);
143 STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21);
144
145 buf[0] += a;
146 buf[1] += b;
147 buf[2] += c;
148 buf[3] += d;
149 }
150
151
152 // Create a MD5 object
153 static
MD5alloc(cmsContext ContextID)154 cmsHANDLE MD5alloc(cmsContext ContextID)
155 {
156 _cmsMD5* ctx = (_cmsMD5*) _cmsMallocZero(ContextID, sizeof(_cmsMD5));
157 if (ctx == NULL) return NULL;
158
159 ctx ->ContextID = ContextID;
160
161 ctx->buf[0] = 0x67452301;
162 ctx->buf[1] = 0xefcdab89;
163 ctx->buf[2] = 0x98badcfe;
164 ctx->buf[3] = 0x10325476;
165
166 ctx->bits[0] = 0;
167 ctx->bits[1] = 0;
168
169 return (cmsHANDLE) ctx;
170 }
171
172
173 static
MD5add(cmsHANDLE Handle,cmsUInt8Number * buf,cmsUInt32Number len)174 void MD5add(cmsHANDLE Handle, cmsUInt8Number* buf, cmsUInt32Number len)
175 {
176 _cmsMD5* ctx = (_cmsMD5*) Handle;
177 cmsUInt32Number t;
178
179 t = ctx->bits[0];
180 if ((ctx->bits[0] = t + (len << 3)) < t)
181 ctx->bits[1]++;
182
183 ctx->bits[1] += len >> 29;
184
185 t = (t >> 3) & 0x3f;
186
187 if (t) {
188
189 cmsUInt8Number *p = (cmsUInt8Number *) ctx->in + t;
190
191 t = 64 - t;
192 if (len < t) {
193 memmove(p, buf, len);
194 return;
195 }
196
197 memmove(p, buf, t);
198 byteReverse(ctx->in, 16);
199
200 MD5_Transform(ctx->buf, (cmsUInt32Number *) ctx->in);
201 buf += t;
202 len -= t;
203 }
204
205 while (len >= 64) {
206 memmove(ctx->in, buf, 64);
207 byteReverse(ctx->in, 16);
208 MD5_Transform(ctx->buf, (cmsUInt32Number *) ctx->in);
209 buf += 64;
210 len -= 64;
211 }
212
213 memmove(ctx->in, buf, len);
214 }
215
216 // Destroy the object and return the checksum
217 static
MD5finish(cmsProfileID * ProfileID,cmsHANDLE Handle)218 void MD5finish(cmsProfileID* ProfileID, cmsHANDLE Handle)
219 {
220 _cmsMD5* ctx = (_cmsMD5*) Handle;
221 cmsUInt32Number count;
222 cmsUInt8Number *p;
223
224 count = (ctx->bits[0] >> 3) & 0x3F;
225
226 p = ctx->in + count;
227 *p++ = 0x80;
228
229 count = 64 - 1 - count;
230
231 if (count < 8) {
232
233 memset(p, 0, count);
234 byteReverse(ctx->in, 16);
235 MD5_Transform(ctx->buf, (cmsUInt32Number *) ctx->in);
236
237 memset(ctx->in, 0, 56);
238 } else {
239 memset(p, 0, count - 8);
240 }
241 byteReverse(ctx->in, 14);
242
243 ((cmsUInt32Number *) ctx->in)[14] = ctx->bits[0];
244 ((cmsUInt32Number *) ctx->in)[15] = ctx->bits[1];
245
246 MD5_Transform(ctx->buf, (cmsUInt32Number *) ctx->in);
247
248 byteReverse((cmsUInt8Number *) ctx->buf, 4);
249 memmove(ProfileID ->ID8, ctx->buf, 16);
250
251 _cmsFree(ctx ->ContextID, ctx);
252 }
253
254
255
256 // Assuming io points to an ICC profile, compute and store MD5 checksum
257 // In the header, rendering intentent, attributes and ID should be set to zero
258 // before computing MD5 checksum (per 6.1.13 in ICC spec)
259
cmsMD5computeID(cmsHPROFILE hProfile)260 cmsBool CMSEXPORT cmsMD5computeID(cmsHPROFILE hProfile)
261 {
262 cmsContext ContextID;
263 cmsUInt32Number BytesNeeded;
264 cmsUInt8Number* Mem = NULL;
265 cmsHANDLE MD5 = NULL;
266 _cmsICCPROFILE* Icc = (_cmsICCPROFILE*) hProfile;
267 _cmsICCPROFILE Keep;
268
269 _cmsAssert(hProfile != NULL);
270
271 ContextID = cmsGetProfileContextID(hProfile);
272
273 // Save a copy of the profile header
274 memmove(&Keep, Icc, sizeof(_cmsICCPROFILE));
275
276 // Set RI, attributes and ID
277 memset(&Icc ->attributes, 0, sizeof(Icc ->attributes));
278 Icc ->RenderingIntent = 0;
279 memset(&Icc ->ProfileID, 0, sizeof(Icc ->ProfileID));
280
281 // Compute needed storage
282 if (!cmsSaveProfileToMem(hProfile, NULL, &BytesNeeded)) goto Error;
283
284 // Allocate memory
285 Mem = (cmsUInt8Number*) _cmsMalloc(ContextID, BytesNeeded);
286 if (Mem == NULL) goto Error;
287
288 // Save to temporary storage
289 if (!cmsSaveProfileToMem(hProfile, Mem, &BytesNeeded)) goto Error;
290
291 // Create MD5 object
292 MD5 = MD5alloc(ContextID);
293 if (MD5 == NULL) goto Error;
294
295 // Add all bytes
296 MD5add(MD5, Mem, BytesNeeded);
297
298 // Temp storage is no longer needed
299 _cmsFree(ContextID, Mem);
300
301 // Restore header
302 memmove(Icc, &Keep, sizeof(_cmsICCPROFILE));
303
304 // And store the ID
305 MD5finish(&Icc ->ProfileID, MD5);
306 return TRUE;
307
308 Error:
309
310 // Free resources as something went wrong
311 // "MD5" cannot be other than NULL here, so no need to free it
312 if (Mem != NULL) _cmsFree(ContextID, Mem);
313 memmove(Icc, &Keep, sizeof(_cmsICCPROFILE));
314 return FALSE;
315 }
316
cmsMD5computeIDExt(const void * buf,unsigned long size,unsigned char ProfileID[16])317 cmsBool CMSEXPORT cmsMD5computeIDExt(const void* buf, unsigned long size, unsigned char ProfileID[16])
318 {
319 cmsHANDLE MD5;
320 cmsUInt8Number* Mem;
321
322 if (buf == NULL)
323 return FALSE;
324 MD5 = NULL;
325 Mem = (cmsUInt8Number*)_cmsMalloc(NULL,size);
326 memmove(Mem,buf,size);
327 // Create MD5 object
328 MD5 = MD5alloc(NULL);
329 if (MD5 == NULL) goto Error;
330
331 // Add all bytes
332 MD5add(MD5, Mem, size);
333
334 // Temp storage is no longer needed
335 _cmsFree(NULL, Mem);
336
337 // And store the ID
338 MD5finish((cmsProfileID*)ProfileID, MD5);
339 return TRUE;
340 Error:
341 if (MD5 != NULL) _cmsFree(NULL, MD5);
342 return FALSE;
343 }
344