//
// Decrypt.cc
//
-// Copyright 1996-2002 Glyph & Cog, LLC
+// Copyright 1996-2003 Glyph & Cog, LLC
//
//========================================================================
-#ifdef __GNUC__
+#include <aconf.h>
+
+#ifdef USE_GCC_PRAGMAS
#pragma implementation
#endif
-#include <aconf.h>
#include "gmem.h"
#include "Decrypt.h"
int permissions, GString *fileID,
GString *ownerPassword, GString *userPassword,
Guchar *fileKey, GBool *ownerPasswordOk) {
- Guchar test[32];
+ Guchar test[32], test2[32];
GString *userPassword2;
Guchar fState[256];
+ Guchar tmpKey[16];
Guchar fx, fy;
- int len, i;
+ int len, i, j;
// try using the supplied owner password to generate the user password
+ *ownerPasswordOk = gFalse;
if (ownerPassword) {
len = ownerPassword->getLength();
if (len < 32) {
} else {
memcpy(test, ownerPassword->getCString(), 32);
}
- } else {
- memcpy(test, passwordPad, 32);
- }
- md5(test, 32, test);
- if (encRevision == 3) {
- for (i = 0; i < 50; ++i) {
- md5(test, 16, test);
+ md5(test, 32, test);
+ if (encRevision == 3) {
+ for (i = 0; i < 50; ++i) {
+ md5(test, 16, test);
+ }
+ }
+ if (encRevision == 2) {
+ rc4InitKey(test, keyLength, fState);
+ fx = fy = 0;
+ for (i = 0; i < 32; ++i) {
+ test2[i] = rc4DecryptByte(fState, &fx, &fy, ownerKey->getChar(i));
+ }
+ } else {
+ memcpy(test2, ownerKey->getCString(), 32);
+ for (i = 19; i >= 0; --i) {
+ for (j = 0; j < keyLength; ++j) {
+ tmpKey[j] = test[j] ^ i;
+ }
+ rc4InitKey(tmpKey, keyLength, fState);
+ fx = fy = 0;
+ for (j = 0; j < 32; ++j) {
+ test2[j] = rc4DecryptByte(fState, &fx, &fy, test2[j]);
+ }
+ }
+ }
+ userPassword2 = new GString((char *)test2, 32);
+ if (makeFileKey2(encVersion, encRevision, keyLength, ownerKey, userKey,
+ permissions, fileID, userPassword2, fileKey)) {
+ *ownerPasswordOk = gTrue;
+ delete userPassword2;
+ return gTrue;
}
- }
- rc4InitKey(test, keyLength, fState);
- fx = fy = 0;
- for (i = 0; i < 32; ++i) {
- test[i] = rc4DecryptByte(fState, &fx, &fy, ownerKey->getChar(i));
- }
- userPassword2 = new GString((char *)test, 32);
- if (makeFileKey2(encVersion, encRevision, keyLength, ownerKey, userKey,
- permissions, fileID, userPassword2, fileKey)) {
- *ownerPasswordOk = gTrue;
delete userPassword2;
- return gTrue;
}
- *ownerPasswordOk = gFalse;
- delete userPassword2;
// try using the supplied user password
return makeFileKey2(encVersion, encRevision, keyLength, ownerKey, userKey,
md5(buf, 68 + fileID->getLength(), fileKey);
if (encRevision == 3) {
for (i = 0; i < 50; ++i) {
- md5(fileKey, 16, fileKey);
+ md5(fileKey, keyLength, fileKey);
}
}
}
// break digest into bytes
- digest[0] = a & 0xff;
- digest[1] = (a >>= 8) & 0xff;
- digest[2] = (a >>= 8) & 0xff;
- digest[3] = (a >>= 8) & 0xff;
- digest[4] = b & 0xff;
- digest[5] = (b >>= 8) & 0xff;
- digest[6] = (b >>= 8) & 0xff;
- digest[7] = (b >>= 8) & 0xff;
- digest[8] = c & 0xff;
- digest[9] = (c >>= 8) & 0xff;
- digest[10] = (c >>= 8) & 0xff;
- digest[11] = (c >>= 8) & 0xff;
- digest[12] = d & 0xff;
- digest[13] = (d >>= 8) & 0xff;
- digest[14] = (d >>= 8) & 0xff;
- digest[15] = (d >>= 8) & 0xff;
+ digest[0] = (Guchar)(a & 0xff);
+ digest[1] = (Guchar)((a >>= 8) & 0xff);
+ digest[2] = (Guchar)((a >>= 8) & 0xff);
+ digest[3] = (Guchar)((a >>= 8) & 0xff);
+ digest[4] = (Guchar)(b & 0xff);
+ digest[5] = (Guchar)((b >>= 8) & 0xff);
+ digest[6] = (Guchar)((b >>= 8) & 0xff);
+ digest[7] = (Guchar)((b >>= 8) & 0xff);
+ digest[8] = (Guchar)(c & 0xff);
+ digest[9] = (Guchar)((c >>= 8) & 0xff);
+ digest[10] = (Guchar)((c >>= 8) & 0xff);
+ digest[11] = (Guchar)((c >>= 8) & 0xff);
+ digest[12] = (Guchar)(d & 0xff);
+ digest[13] = (Guchar)((d >>= 8) & 0xff);
+ digest[14] = (Guchar)((d >>= 8) & 0xff);
+ digest[15] = (Guchar)((d >>= 8) & 0xff);
}