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ptformat: Decrypt ptf files exported from ptx sessions

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This commit is contained in:
Damien Zammit 2016-08-02 22:20:24 +10:00
parent 480e0b2a5f
commit 3cda7bcbfb
2 changed files with 29 additions and 0 deletions
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28
libs/ptformat/ptfformat.cc
View file

@ -234,6 +234,12 @@ PTFFormat::load(std::string path, int64_t targetsr) {
unxor10(); unxor10();
} }
// Special case when ptx is exported to ptf in PT
if (v == 3) {
version = 11;
unxor_ptx_to_ptf();
}
if (version == 0 || version == 5 || version == 7) { if (version == 0 || version == 5 || version == 7) {
/* Haven't detected version yet so decipher */ /* Haven't detected version yet so decipher */
j = 0; j = 0;
@ -306,6 +312,28 @@ PTFFormat::unxor10(void)
} }
} }
void
PTFFormat::unxor_ptx_to_ptf(void)
{
unsigned char keyy[16] = { 0x00,0x10,0x20,0x30,0x40,0x50,0x60,0x70,
0x80,0x90,0xa0,0xb0,0xc0,0xd0,0xe0,0xf0
};
uint64_t j;
uint8_t i;
for (i = 0, j = 0x10; j < len; j++,i++) {
ptfunxored[j] ^= keyy[i];
if ((j % 16) == 0) {
i = 0;
if (ptfunxored[j] % 2 == 0) {
ptfunxored[j]++;
} else {
ptfunxored[j]--;
}
}
}
}
int int
PTFFormat::parse(void) { PTFFormat::parse(void) {
if (version == 5) { if (version == 5) {

1
libs/ptformat/ptfformat.h
View file

@ -119,6 +119,7 @@ private:
bool foundin(std::string haystack, std::string needle); bool foundin(std::string haystack, std::string needle);
int parse(void); int parse(void);
void unxor10(void); void unxor10(void);
void unxor_ptx_to_ptf(void);
void setrates(void); void setrates(void);
void parse5header(void); void parse5header(void);
void parse7header(void); void parse7header(void);