static void
rc4_bench(void) {
uint8_t *enckey;
uint8_t match[32] = {0xDE, 0xAD, 0xBE, 0xAD,
0xDE, 0xAD, 0xBE, 0xAD,
0xDE, 0xAD, 0xBE, 0xAD,
0xDE, 0xAD, 0xBE, 0xAD,
0xDE, 0xAD, 0xBE, 0xAD,
0xDE, 0xAD, 0xBE, 0xAD,
0xDE, 0xAD, 0xBE, 0xAD,
0xDE, 0xAD, 0xBE, 0xAD};
uint8_t cipher[32] = {0xBE, 0xAD, 0xDE, 0xAD,
0xBE, 0xAD, 0xDE, 0xAD,
0xBE, 0xAD, 0xDE, 0xAD,
0xBE, 0xAD, 0xDE, 0xAD,
0xBE, 0xAD, 0xDE, 0xAD,
0xBE, 0xAD, 0xDE, 0xAD,
0xBE, 0xAD, 0xDE, 0xAD,
0xBE, 0xAD, 0xDE, 0xAD};
unsigned int nrprocessed = 0;
clock_t startTime, endTime;
enckey = calloc(16, sizeof(uint8_t));
alarm(BENCHINTERVAL);
startTime = clock();
while(!finished) {
rc4Match40b(enckey, cipher, match);
enckey[0]++;
nrprocessed++;
}
endTime = clock();
print_and_clean("RC4 (40, static):", nrprocessed, &startTime, &endTime);
setrc4DecryptMethod(40);
nrprocessed = 0;
alarm(BENCHINTERVAL);
startTime = clock();
while(!finished) {
rc4Decrypt(enckey, cipher, 3, match);
enckey[0]++;
nrprocessed++;
}
endTime = clock();
print_and_clean("RC4 (40, no check):", nrprocessed, &startTime, &endTime);
setrc4DecryptMethod(128);
nrprocessed = 0;
alarm(BENCHINTERVAL);
startTime = clock();
while(!finished) {
rc4Decrypt(enckey, cipher, 3, match);
enckey[0]++;
nrprocessed++;
}
endTime = clock();
print_and_clean("RC4 (128, no check):", nrprocessed, &startTime, &endTime);
free(enckey);
}
/** initPDFCrack is doing all the initialisations before you are able to call
runCrack(). Make sure that you run cleanPDFCrack before you call this
after the first time.
*/
bool initPDFCrack(struct custom_salt *cs)
{
uint8_t buf[128];
unsigned int upwlen;
EncData *e = &cs->e;
const uint8_t * upw = cs->userpassword;
bool user = cs->e.work_with_user;
cs->ekwlen = initEncKeyWorkSpace(e->revision, e->encryptMetaData,
e->permissions, e->o_string, e->fileID, e->fileIDLen, cs);
cs->workWithUser = user;
setrc4DecryptMethod((unsigned int) e->length);
if (upw) {
upwlen = strlen((const char *) upw);
if (upwlen > 32)
upwlen = 32;
memcpy(cs->password_user, upw, upwlen);
memcpy(cs->password_user + upwlen, pad, 32 - upwlen);
memcpy(cs->encKeyWorkSpace, cs->password_user, 32);
cs->knownPassword = true;
}
if (cs->e.revision == 2) {
if (cs->knownPassword) {
if (!isUserPasswordRev2(cs))
return false;
memcpy(cs->encKeyWorkSpace, pad, 32);
} else {
memcpy(cs->password_user, pad, 32);
cs->knownPassword = isUserPasswordRev2(cs);
}
} else if (e->revision >= 3) {
memcpy(buf, pad, 32);
memcpy(buf + 32, e->fileID, e->fileIDLen);
md5(buf, 32 + e->fileIDLen, cs->rev3TestKey);
if (cs->knownPassword) {
if (!isUserPasswordRev3(cs, cs->encKeyWorkSpace))
return false;
memcpy(cs->encKeyWorkSpace, pad, 32);
} else {
memcpy(cs->password_user, pad, 32);
cs->knownPassword = isUserPasswordRev3(cs, cs->encKeyWorkSpace);
}
}
return true;
}
void loadPDFCrack(struct custom_salt *cs)
{
setrc4DecryptMethod((unsigned int) cs->e.length);
}
