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implement save file decryption/encryption

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This commit is contained in:
Martin Michelsen
2023-03-31 23:56:25 -07:00
parent 06ba95ed97
commit 3b9a76eec8
39 changed files with 666 additions and 205 deletions
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src/PSOEncryption.cc
+32 -4
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@@ -38,8 +38,10 @@ uint32_t PSOLFGEncryption::next(bool advance) {
return ret;
}
template <typename LongT>
template <bool IsBigEndian>
void PSOLFGEncryption::encrypt_t(void* vdata, size_t size, bool advance) {
using U32T = typename std::conditional<IsBigEndian, be_uint32_t, le_uint32_t>::type;
if (size & 3) {
throw invalid_argument("size must be a multiple of 4");
}
@@ -48,18 +50,44 @@ void PSOLFGEncryption::encrypt_t(void* vdata, size_t size, bool advance) {
}
size >>= 2;
LongT* data = reinterpret_cast<LongT*>(vdata);
U32T* data = reinterpret_cast<U32T*>(vdata);
for (size_t x = 0; x < size; x++) {
data[x] ^= this->next(advance);
}
}
template <bool IsBigEndian>
void PSOLFGEncryption::encrypt_minus_t(void* vdata, size_t size, bool advance) {
using U32T = typename std::conditional<IsBigEndian, be_uint32_t, le_uint32_t>::type;
if (size & 3) {
throw invalid_argument("size must be a multiple of 4");
}
if (!advance && (size != 4)) {
throw logic_error("cannot peek-encrypt/decrypt with size > 4");
}
size >>= 2;
U32T* data = reinterpret_cast<U32T*>(vdata);
for (size_t x = 0; x < size; x++) {
data[x] = this->next(advance) - data[x];
}
}
void PSOLFGEncryption::encrypt(void* vdata, size_t size, bool advance) {
this->encrypt_t<le_uint32_t>(vdata, size, advance);
this->encrypt_t<false>(vdata, size, advance);
}
void PSOLFGEncryption::encrypt_big_endian(void* vdata, size_t size, bool advance) {
this->encrypt_t<be_uint32_t>(vdata, size, advance);
this->encrypt_t<true>(vdata, size, advance);
}
void PSOLFGEncryption::encrypt_minus(void* vdata, size_t size, bool advance) {
this->encrypt_minus_t<false>(vdata, size, advance);
}
void PSOLFGEncryption::encrypt_big_endian_minus(void* vdata, size_t size, bool advance) {
this->encrypt_minus_t<true>(vdata, size, advance);
}
void PSOLFGEncryption::encrypt_both_endian(