1//---------------------------------------------------------------------------------
2//
3// Little Color Management System
4// Copyright (c) 1998-2017 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
27#include "lcms2_internal.h"
28
29#ifdef CMS_USE_BIG_ENDIAN
30
31static
32void byteReverse(cmsUInt8Number * buf, cmsUInt32Number longs)
33{
34 do {
35
36 cmsUInt32Number t = _cmsAdjustEndianess32(*(cmsUInt32Number *) buf);
37 *(cmsUInt32Number *) buf = t;
38 buf += sizeof(cmsUInt32Number);
39
40 } while (--longs);
41
42}
43
44#else
45#define byteReverse(buf, len)
46#endif
47
48
49typedef struct {
50
51 cmsUInt32Number buf[4];
52 cmsUInt32Number bits[2];
53 cmsUInt8Number in[64];
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
66static
67void 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
153static
154cmsHANDLE MD5alloc(cmsContext ContextID)
155{
156 _cmsMD5* ctx = (_cmsMD5*) _cmsMallocZero(ContextID, sizeof(_cmsMD5));
157 if (ctx == NULL) return NULL;
158
159 ctx->buf[0] = 0x67452301;
160 ctx->buf[1] = 0xefcdab89;
161 ctx->buf[2] = 0x98badcfe;
162 ctx->buf[3] = 0x10325476;
163
164 ctx->bits[0] = 0;
165 ctx->bits[1] = 0;
166
167 return (cmsHANDLE) ctx;
168}
169
170
171static
172void MD5add(cmsHANDLE Handle, cmsUInt8Number* buf, cmsUInt32Number len)
173{
174 _cmsMD5* ctx = (_cmsMD5*) Handle;
175 cmsUInt32Number t;
176
177 t = ctx->bits[0];
178 if ((ctx->bits[0] = t + (len << 3)) < t)
179 ctx->bits[1]++;
180
181 ctx->bits[1] += len >> 29;
182
183 t = (t >> 3) & 0x3f;
184
185 if (t) {
186
187 cmsUInt8Number *p = (cmsUInt8Number *) ctx->in + t;
188
189 t = 64 - t;
190 if (len < t) {
191 memmove(p, buf, len);
192 return;
193 }
194
195 memmove(p, buf, t);
196 byteReverse(ctx->in, 16);
197
198 MD5_Transform(ctx->buf, (cmsUInt32Number *) ctx->in);
199 buf += t;
200 len -= t;
201 }
202
203 while (len >= 64) {
204 memmove(ctx->in, buf, 64);
205 byteReverse(ctx->in, 16);
206 MD5_Transform(ctx->buf, (cmsUInt32Number *) ctx->in);
207 buf += 64;
208 len -= 64;
209 }
210
211 memmove(ctx->in, buf, len);
212}
213
214// Destroy the object and return the checksum
215static
216void MD5finish(cmsContext ContextID, cmsProfileID* ProfileID, cmsHANDLE Handle)
217{
218 _cmsMD5* ctx = (_cmsMD5*) Handle;
219 cmsUInt32Number count;
220 cmsUInt8Number *p;
221
222 count = (ctx->bits[0] >> 3) & 0x3F;
223
224 p = ctx->in + count;
225 *p++ = 0x80;
226
227 count = 64 - 1 - count;
228
229 if (count < 8) {
230
231 memset(p, 0, count);
232 byteReverse(ctx->in, 16);
233 MD5_Transform(ctx->buf, (cmsUInt32Number *) ctx->in);
234
235 memset(ctx->in, 0, 56);
236 } else {
237 memset(p, 0, count - 8);
238 }
239 byteReverse(ctx->in, 14);
240
241 ((cmsUInt32Number *) ctx->in)[14] = ctx->bits[0];
242 ((cmsUInt32Number *) ctx->in)[15] = ctx->bits[1];
243
244 MD5_Transform(ctx->buf, (cmsUInt32Number *) ctx->in);
245
246 byteReverse((cmsUInt8Number *) ctx->buf, 4);
247 memmove(ProfileID ->ID8, ctx->buf, 16);
248
249 _cmsFree(ContextID, ctx);
250}
251
252
253
254// Assuming io points to an ICC profile, compute and store MD5 checksum
255// In the header, rendering intentent, attributes and ID should be set to zero
256// before computing MD5 checksum (per 6.1.13 in ICC spec)
257
258cmsBool CMSEXPORT cmsMD5computeID(cmsContext ContextID, cmsHPROFILE hProfile)
259{
260 cmsUInt32Number BytesNeeded;
261 cmsUInt8Number* Mem = NULL;
262 cmsHANDLE MD5 = NULL;
263 _cmsICCPROFILE* Icc = (_cmsICCPROFILE*) hProfile;
264 _cmsICCPROFILE Keep;
265
266 _cmsAssert(hProfile != NULL);
267
268 // Save a copy of the profile header
269 memmove(&Keep, Icc, sizeof(_cmsICCPROFILE));
270
271 // Set RI, attributes and ID
272 memset(&Icc ->attributes, 0, sizeof(Icc ->attributes));
273 Icc ->RenderingIntent = 0;
274 memset(&Icc ->ProfileID, 0, sizeof(Icc ->ProfileID));
275
276 // Compute needed storage
277 if (!cmsSaveProfileToMem(ContextID, hProfile, NULL, &BytesNeeded)) goto Error;
278
279 // Allocate memory
280 Mem = (cmsUInt8Number*) _cmsMalloc(ContextID, BytesNeeded);
281 if (Mem == NULL) goto Error;
282
283 // Save to temporary storage
284 if (!cmsSaveProfileToMem(ContextID, hProfile, Mem, &BytesNeeded)) goto Error;
285
286 // Create MD5 object
287 MD5 = MD5alloc(ContextID);
288 if (MD5 == NULL) goto Error;
289
290 // Add all bytes
291 MD5add(MD5, Mem, BytesNeeded);
292
293 // Temp storage is no longer needed
294 _cmsFree(ContextID, Mem);
295
296 // Restore header
297 memmove(Icc, &Keep, sizeof(_cmsICCPROFILE));
298
299 // And store the ID
300 MD5finish(ContextID, &Icc ->ProfileID, MD5);
301 return TRUE;
302
303Error:
304
305 // Free resources as something went wrong
306 // "MD5" cannot be other than NULL here, so no need to free it
307 if (Mem != NULL) _cmsFree(ContextID, Mem);
308 memmove(Icc, &Keep, sizeof(_cmsICCPROFILE));
309 return FALSE;
310}
311
312