#ifndef _SQEX_SCD_SSCF_ENCRYPTED_H_ #define _SQEX_SCD_SSCF_ENCRYPTED_H_ #include "../streamfile.h" typedef struct { uint8_t key[0x800]; } sscf_io; static size_t sscf_io_read(STREAMFILE* sf, uint8_t* dest, off_t offset, size_t length, sscf_io* io) { int i; size_t bytes = read_streamfile(dest, offset, length, sf); for (i = 0; i < bytes; i++) { dest[i] ^= io->key[(offset + i) % sizeof(io->key)]; } return bytes; } /* Decrypts SSCF streams */ static STREAMFILE* setup_sscf_streamfile(STREAMFILE* sf, uint32_t xorkey) { STREAMFILE *new_sf = NULL; sscf_io io = {0}; int i; uint32_t stream_offset = 0x80; uint32_t stream_size = get_streamfile_size(sf) - stream_offset; /* setup key */ xorkey = (xorkey >> 21) | (xorkey << 11); for (i = 0; i < sizeof(io.key); i += 4) { put_u32le(io.key + i, xorkey); xorkey += (xorkey >> 29) | (xorkey << 3); } new_sf = open_wrap_streamfile(sf); new_sf = open_io_streamfile_f(new_sf, &io, sizeof(sscf_io), sscf_io_read, NULL); if (new_sf) { stream_size = read_u32le(0x84, new_sf) + 0x08; /* RIFF size */ } new_sf = open_clamp_streamfile_f(new_sf, stream_offset, stream_size); new_sf = open_fakename_streamfile_f(new_sf, NULL, "xma"); return new_sf; } #endif