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#include <global_types.h>
#include <string.h>
#include "pso/macros.h"
#include "pso/PSOV3Encryption.h"
u32 PSOV3Encryption::next() {
if (++m_buffer_start == m_buffer_end) {
update_stream();
}
return *m_buffer_start;
}
void PSOV3Encryption::update_stream() {
u32 *ptr;
u32 *part1;
u32 *part2;
part2 = m_buffer;
m_buffer_start = m_buffer;
ptr = m_buffer;
part1 = &ptr[489];
for (; part1 != m_buffer_end; *ptr++ ^= *part1++);
for (; ptr != m_buffer_end; *ptr++ ^= *part2++);
}
void PSOV3Encryption::init(u32 seed) {
const size_t size = (sizeof(m_buffer)/sizeof(*m_buffer))-1;
m_buffer_end = &m_buffer[size+1];
m_buffer_start = m_buffer;
u32 value = 0;
for (int i = 0; i <= 16; ++i, *m_buffer_start++ = value) {
for (int j = 32; j; --j) {
seed *= 0x5d588b65;
value = (++seed & (1 << 31)) | (value >> 1);
}
}
--m_buffer_start;
*m_buffer_start = (*m_buffer_start << 23) ^ (m_buffer[0] >> 9) ^ m_buffer[0xf];
for (u32 *buf_val = &m_buffer[0], *next_buf_val = &m_buffer[1], *buf = m_buffer_start++; m_buffer_start != m_buffer_end;) {
*m_buffer_start++ = (*buf_val++ << 23) ^ (*next_buf_val++ >> 9) ^ *buf++;
}
update_stream();
update_stream();
update_stream();
m_buffer_start = &m_buffer[size-1];
}
PSOV3Encryption::~PSOV3Encryption() {
memset(m_buffer, 0, sizeof(m_buffer));
m_buffer_start = nullptr;
m_buffer_end = nullptr;
}
PSOV3Encryption::PSOV3Encryption() : PSOEncryption() {
init(0);
}
PSOEncryption::~PSOEncryption() {
}
PSOEncryption::PSOEncryption() {
}
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