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clean up v2 encryption code

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This commit is contained in:
Martin Michelsen
2024-01-03 23:27:55 -08:00
parent 08437844e4
commit 70207896e3
1 changed files with 12 additions and 34 deletions
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src/PSOEncryption.cc
+12 -34
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@@ -118,21 +118,14 @@ void PSOLFGEncryption::encrypt_both_endian(
PSOV2Encryption::PSOV2Encryption(uint32_t seed)
: PSOLFGEncryption(seed, this->STREAM_LENGTH + 1, this->STREAM_LENGTH) {
uint32_t esi, ebx, edi, eax, edx, var1;
esi = 1;
ebx = this->initial_seed;
edi = 0x15;
this->stream[56] = ebx;
this->stream[55] = ebx;
while (edi <= 0x46E) {
eax = edi;
var1 = eax / 55;
edx = eax - (var1 * 55);
ebx = ebx - esi;
edi = edi + 0x15;
this->stream[edx] = esi;
esi = ebx;
ebx = this->stream[edx];
uint32_t a = 1, b = this->initial_seed;
this->stream[0x37] = b;
for (uint16_t virtual_index = 0x15; virtual_index <= 0x36 * 0x15; virtual_index += 0x15) {
b -= a;
this->stream[virtual_index % 0x37] = a;
uint32_t c = a;
a = b;
b = c;
}
for (size_t x = 0; x < 5; x++) {
this->update_stream();
@@ -141,26 +134,11 @@ PSOV2Encryption::PSOV2Encryption(uint32_t seed)
}
void PSOV2Encryption::update_stream() {
uint32_t esi, edi, eax, ebp, edx;
edi = 1;
edx = 0x18;
eax = edi;
while (edx > 0) {
esi = this->stream[eax + 0x1F];
ebp = this->stream[eax] - esi;
this->stream[eax] = ebp;
eax++;
edx--;
for (size_t z = 1; z < 0x19; z++) {
this->stream[z] -= this->stream[z + 0x1F];
}
edi = 0x19;
edx = 0x1F;
eax = edi;
while (edx > 0) {
esi = this->stream[eax - 0x18];
ebp = this->stream[eax] - esi;
this->stream[eax] = ebp;
eax++;
edx--;
for (size_t z = 0x19; z < 0x38; z++) {
this->stream[z] -= this->stream[z - 0x18];
}
this->offset = 1;
this->cycles++;