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1 //---------------------------------------------------------------------------------
2 //
3 //  Little Color Management System
4 //  Copyright (c) 1998-2016 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 
31 static
byteReverse(cmsUInt8Number * buf,cmsUInt32Number longs)32 void 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 
49 typedef struct {
50 
51     cmsUInt32Number buf[4];
52     cmsUInt32Number bits[2];
53     cmsUInt8Number in[64];
54     cmsContext ContextID;
55 
56 } _cmsMD5;
57 
58 #define F1(x, y, z) (z ^ (x & (y ^ z)))
59 #define F2(x, y, z) F1(z, x, y)
60 #define F3(x, y, z) (x ^ y ^ z)
61 #define F4(x, y, z) (y ^ (x | ~z))
62 
63 #define STEP(f, w, x, y, z, data, s) \
64     ( w += f(x, y, z) + data,  w = w<<s | w>>(32-s),  w += x )
65 
66 
67 static
MD5_Transform(cmsUInt32Number buf[4],cmsUInt32Number in[16])68 void MD5_Transform(cmsUInt32Number buf[4], cmsUInt32Number in[16])
69 
70 {
71     register cmsUInt32Number a, b, c, d;
72 
73     a = buf[0];
74     b = buf[1];
75     c = buf[2];
76     d = buf[3];
77 
78     STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7);
79     STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12);
80     STEP(F1, c, d, a, b, in[2] + 0x242070db, 17);
81     STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22);
82     STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7);
83     STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12);
84     STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17);
85     STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22);
86     STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7);
87     STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12);
88     STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17);
89     STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22);
90     STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7);
91     STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12);
92     STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17);
93     STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22);
94 
95     STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5);
96     STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9);
97     STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14);
98     STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);
99     STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5);
100     STEP(F2, d, a, b, c, in[10] + 0x02441453, 9);
101     STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14);
102     STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);
103     STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5);
104     STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9);
105     STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14);
106     STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20);
107     STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5);
108     STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);
109     STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14);
110     STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);
111 
112     STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4);
113     STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11);
114     STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16);
115     STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23);
116     STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4);
117     STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);
118     STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);
119     STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23);
120     STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4);
121     STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11);
122     STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16);
123     STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23);
124     STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4);
125     STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11);
126     STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
127     STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23);
128 
129     STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6);
130     STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10);
131     STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15);
132     STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21);
133     STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6);
134     STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);
135     STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15);
136     STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21);
137     STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);
138     STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
139     STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15);
140     STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
141     STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6);
142     STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10);
143     STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);
144     STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21);
145 
146     buf[0] += a;
147     buf[1] += b;
148     buf[2] += c;
149     buf[3] += d;
150 }
151 
152 
153 // Create a MD5 object
154 static
MD5alloc(cmsContext ContextID)155 cmsHANDLE  MD5alloc(cmsContext ContextID)
156 {
157     _cmsMD5* ctx = (_cmsMD5*) _cmsMallocZero(ContextID, sizeof(_cmsMD5));
158     if (ctx == NULL) return NULL;
159 
160     ctx ->ContextID = ContextID;
161 
162     ctx->buf[0] = 0x67452301;
163     ctx->buf[1] = 0xefcdab89;
164     ctx->buf[2] = 0x98badcfe;
165     ctx->buf[3] = 0x10325476;
166 
167     ctx->bits[0] = 0;
168     ctx->bits[1] = 0;
169 
170     return (cmsHANDLE) ctx;
171 }
172 
173 
174 static
MD5add(cmsHANDLE Handle,cmsUInt8Number * buf,cmsUInt32Number len)175 void MD5add(cmsHANDLE Handle, cmsUInt8Number* buf, cmsUInt32Number len)
176 {
177     _cmsMD5* ctx = (_cmsMD5*) Handle;
178     cmsUInt32Number t;
179 
180     t = ctx->bits[0];
181     if ((ctx->bits[0] = t + (len << 3)) < t)
182         ctx->bits[1]++;
183 
184     ctx->bits[1] += len >> 29;
185 
186     t = (t >> 3) & 0x3f;
187 
188     if (t) {
189 
190         cmsUInt8Number *p = (cmsUInt8Number *) ctx->in + t;
191 
192         t = 64 - t;
193         if (len < t) {
194             memmove(p, buf, len);
195             return;
196         }
197 
198         memmove(p, buf, t);
199         byteReverse(ctx->in, 16);
200 
201         MD5_Transform(ctx->buf, (cmsUInt32Number *) ctx->in);
202         buf += t;
203         len -= t;
204     }
205 
206     while (len >= 64) {
207         memmove(ctx->in, buf, 64);
208         byteReverse(ctx->in, 16);
209         MD5_Transform(ctx->buf, (cmsUInt32Number *) ctx->in);
210         buf += 64;
211         len -= 64;
212     }
213 
214     memmove(ctx->in, buf, len);
215 }
216 
217 // Destroy the object and return the checksum
218 static
MD5finish(cmsProfileID * ProfileID,cmsHANDLE Handle)219 void MD5finish(cmsProfileID* ProfileID,  cmsHANDLE Handle)
220 {
221     _cmsMD5* ctx = (_cmsMD5*) Handle;
222     cmsUInt32Number count;
223     cmsUInt8Number *p;
224 
225     count = (ctx->bits[0] >> 3) & 0x3F;
226 
227     p = ctx->in + count;
228     *p++ = 0x80;
229 
230     count = 64 - 1 - count;
231 
232     if (count < 8) {
233 
234         memset(p, 0, count);
235         byteReverse(ctx->in, 16);
236         MD5_Transform(ctx->buf, (cmsUInt32Number *) ctx->in);
237 
238         memset(ctx->in, 0, 56);
239     } else {
240         memset(p, 0, count - 8);
241     }
242     byteReverse(ctx->in, 14);
243 
244     ((cmsUInt32Number *) ctx->in)[14] = ctx->bits[0];
245     ((cmsUInt32Number *) ctx->in)[15] = ctx->bits[1];
246 
247     MD5_Transform(ctx->buf, (cmsUInt32Number *) ctx->in);
248 
249     byteReverse((cmsUInt8Number *) ctx->buf, 4);
250     memmove(ProfileID ->ID8, ctx->buf, 16);
251 
252     _cmsFree(ctx ->ContextID, ctx);
253 }
254 
255 
256 
257 // Assuming io points to an ICC profile, compute and store MD5 checksum
258 // In the header, rendering intentent, attributes and ID should be set to zero
259 // before computing MD5 checksum (per 6.1.13 in ICC spec)
260 
cmsMD5computeID(cmsHPROFILE hProfile)261 cmsBool CMSEXPORT cmsMD5computeID(cmsHPROFILE hProfile)
262 {
263     cmsContext   ContextID;
264     cmsUInt32Number BytesNeeded;
265     cmsUInt8Number* Mem = NULL;
266     cmsHANDLE  MD5 = NULL;
267     _cmsICCPROFILE* Icc = (_cmsICCPROFILE*) hProfile;
268     _cmsICCPROFILE Keep;
269 
270     _cmsAssert(hProfile != NULL);
271 
272     ContextID = cmsGetProfileContextID(hProfile);
273 
274     // Save a copy of the profile header
275     memmove(&Keep, Icc, sizeof(_cmsICCPROFILE));
276 
277     // Set RI, attributes and ID
278     memset(&Icc ->attributes, 0, sizeof(Icc ->attributes));
279     Icc ->RenderingIntent = 0;
280     memset(&Icc ->ProfileID, 0, sizeof(Icc ->ProfileID));
281 
282     // Compute needed storage
283     if (!cmsSaveProfileToMem(hProfile, NULL, &BytesNeeded)) goto Error;
284 
285     // Allocate memory
286     Mem = (cmsUInt8Number*) _cmsMalloc(ContextID, BytesNeeded);
287     if (Mem == NULL) goto Error;
288 
289     // Save to temporary storage
290     if (!cmsSaveProfileToMem(hProfile, Mem, &BytesNeeded)) goto Error;
291 
292     // Create MD5 object
293     MD5 = MD5alloc(ContextID);
294     if (MD5 == NULL) goto Error;
295 
296     // Add all bytes
297     MD5add(MD5, Mem, BytesNeeded);
298 
299     // Temp storage is no longer needed
300     _cmsFree(ContextID, Mem);
301 
302     // Restore header
303     memmove(Icc, &Keep, sizeof(_cmsICCPROFILE));
304 
305     // And store the ID
306     MD5finish(&Icc ->ProfileID,  MD5);
307     return TRUE;
308 
309 Error:
310 
311     // Free resources as something went wrong
312     // "MD5" cannot be other than NULL here, so no need to free it
313     if (Mem != NULL) _cmsFree(ContextID, Mem);
314     memmove(Icc, &Keep, sizeof(_cmsICCPROFILE));
315     return FALSE;
316 }
317 
318