mirror of
https://github.com/d0k3/GodMode9.git
synced 2025-06-26 13:42:47 +00:00
184 lines
7.9 KiB
C
184 lines
7.9 KiB
C
#include "cia.h"
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#include "ff.h"
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#include "aes.h"
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#include "sha.h"
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u32 ValidateCiaHeader(CiaHeader* header) {
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if ((header->size_header != CIA_HEADER_SIZE) ||
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(header->size_cert != CIA_CERT_SIZE) ||
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(header->size_ticket != CIA_TICKET_SIZE) ||
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(header->size_tmd < CIA_TMD_SIZE_MIN) ||
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(header->size_tmd > CIA_TMD_SIZE_MAX) ||
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(header->size_content == 0) ||
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((header->size_meta != 0) && (header->size_meta != CIA_META_SIZE)))
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return 1;
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return 0;
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}
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u32 GetCiaInfo(CiaInfo* info, CiaHeader* header) {
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memcpy(info, header, 0x20); // take over first 0x20 byte
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info->offset_cert = align(header->size_header, 64);
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info->offset_ticket = info->offset_cert + align(header->size_cert, 64);
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info->offset_tmd = info->offset_ticket + align(header->size_ticket, 64);
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info->offset_content = info->offset_tmd + align(header->size_tmd, 64);
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info->offset_meta = (header->size_meta) ? info->offset_content + align(header->size_content, 64) : 0;
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info->offset_content_list = info->offset_tmd + sizeof(TitleMetaData);
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info->size_content_list = info->size_tmd - sizeof(TitleMetaData);
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info->size_cia = (header->size_meta) ? info->offset_meta + info->size_meta :
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info->offset_content + info->size_content;
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info->max_contents = (info->size_tmd - sizeof(TitleMetaData)) / sizeof(TmdContentChunk);
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return 0;
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}
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u32 GetCiaContentInfo(CiaContentInfo* contents, TitleMetaData* tmd) {
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TmdContentChunk* content_list = (TmdContentChunk*) (tmd + 1);
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u32 content_count = getbe16(tmd->content_count);
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u64 next_offset = 0;
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for (u32 i = 0; (i < content_count) && (i < CIA_MAX_CONTENTS); i++) {
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contents[i].offset = next_offset;
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contents[i].size = getbe64(content_list[i].size);
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contents[i].id = getbe32(content_list[i].id);
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contents[i].index = getbe16(content_list[i].index);
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contents[i].encrypted = getbe16(content_list[i].type) & 0x1;
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next_offset += contents[i].size;
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}
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return 0;
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}
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u32 GetTitleKey(u8* titlekey, Ticket* ticket) {
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// From https://github.com/profi200/Project_CTR/blob/master/makerom/pki/prod.h#L19
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static const u8 common_keyy[6][16] = {
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{0xD0, 0x7B, 0x33, 0x7F, 0x9C, 0xA4, 0x38, 0x59, 0x32, 0xA2, 0xE2, 0x57, 0x23, 0x23, 0x2E, 0xB9} , // 0 - eShop Titles
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{0x0C, 0x76, 0x72, 0x30, 0xF0, 0x99, 0x8F, 0x1C, 0x46, 0x82, 0x82, 0x02, 0xFA, 0xAC, 0xBE, 0x4C} , // 1 - System Titles
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{0xC4, 0x75, 0xCB, 0x3A, 0xB8, 0xC7, 0x88, 0xBB, 0x57, 0x5E, 0x12, 0xA1, 0x09, 0x07, 0xB8, 0xA4} , // 2
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{0xE4, 0x86, 0xEE, 0xE3, 0xD0, 0xC0, 0x9C, 0x90, 0x2F, 0x66, 0x86, 0xD4, 0xC0, 0x6F, 0x64, 0x9F} , // 3
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{0xED, 0x31, 0xBA, 0x9C, 0x04, 0xB0, 0x67, 0x50, 0x6C, 0x44, 0x97, 0xA3, 0x5B, 0x78, 0x04, 0xFC} , // 4
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{0x5E, 0x66, 0x99, 0x8A, 0xB4, 0xE8, 0x93, 0x16, 0x06, 0x85, 0x0F, 0xD7, 0xA1, 0x6D, 0xD7, 0x55} , // 5
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};
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// From https://github.com/profi200/Project_CTR/blob/master/makerom/pki/dev.h#L21
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/* static const u8 common_key_devkit[6][16] = { // unused atm!
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{0x55, 0xA3, 0xF8, 0x72, 0xBD, 0xC8, 0x0C, 0x55, 0x5A, 0x65, 0x43, 0x81, 0x13, 0x9E, 0x15, 0x3B} , // 0 - eShop Titles
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{0x44, 0x34, 0xED, 0x14, 0x82, 0x0C, 0xA1, 0xEB, 0xAB, 0x82, 0xC1, 0x6E, 0x7B, 0xEF, 0x0C, 0x25} , // 1 - System Titles
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{0xF6, 0x2E, 0x3F, 0x95, 0x8E, 0x28, 0xA2, 0x1F, 0x28, 0x9E, 0xEC, 0x71, 0xA8, 0x66, 0x29, 0xDC} , // 2
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{0x2B, 0x49, 0xCB, 0x6F, 0x99, 0x98, 0xD9, 0xAD, 0x94, 0xF2, 0xED, 0xE7, 0xB5, 0xDA, 0x3E, 0x27} , // 3
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{0x75, 0x05, 0x52, 0xBF, 0xAA, 0x1C, 0x04, 0x07, 0x55, 0xC8, 0xD5, 0x9A, 0x55, 0xF9, 0xAD, 0x1F} , // 4
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{0xAA, 0xDA, 0x4C, 0xA8, 0xF6, 0xE5, 0xA9, 0x77, 0xE0, 0xA0, 0xF9, 0xE4, 0x76, 0xCF, 0x0D, 0x63} , // 5
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};*/
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// setup key 0x3D
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if (ticket->commonkey_idx >= 6) return 1;
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setup_aeskeyY(0x3D, (void*) common_keyy[ticket->commonkey_idx >= 6]);
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use_aeskey(0x3D);
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// grab and decrypt the titlekey
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u8 ctr[16] = { 0 };
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memcpy(ctr, ticket->title_id, 8);
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memcpy(titlekey, ticket->titlekey, 16);
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set_ctr(ctr);
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aes_decrypt(titlekey, titlekey, 1, AES_CNT_TITLEKEY_DECRYPT_MODE);
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return 0;
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}
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u32 GetTmdCtr(u8* ctr, TmdContentChunk* chunk) {
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memset(ctr, 0, 16);
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memcpy(ctr, chunk->index, 2);
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return 0;
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}
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u32 BuildCiaCert(u8* ciacert) {
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const u8 cert_hash_expected[0x20] = {
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0xC7, 0x2E, 0x1C, 0xA5, 0x61, 0xDC, 0x9B, 0xC8, 0x05, 0x58, 0x58, 0x9C, 0x63, 0x08, 0x1C, 0x8A,
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0x10, 0x78, 0xDF, 0x42, 0x99, 0x80, 0x3A, 0x68, 0x58, 0xF0, 0x41, 0xF9, 0xCB, 0x10, 0xE6, 0x35
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};
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// open certs.db file on SysNAND
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FIL db;
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UINT bytes_read;
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if (f_open(&db, "1:/dbs/certs.db", FA_READ | FA_OPEN_EXISTING) != FR_OK)
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return 1;
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// grab CIA cert from 4 offsets
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f_lseek(&db, 0x0C10);
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f_read(&db, ciacert + 0x000, 0x1F0, &bytes_read);
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f_lseek(&db, 0x3A00);
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f_read(&db, ciacert + 0x1F0, 0x210, &bytes_read);
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f_lseek(&db, 0x3F10);
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f_read(&db, ciacert + 0x400, 0x300, &bytes_read);
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f_lseek(&db, 0x3C10);
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f_read(&db, ciacert + 0x700, 0x300, &bytes_read);
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f_close(&db);
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// check the certificate hash
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u8 cert_hash[0x20];
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sha_quick(cert_hash, ciacert, CIA_CERT_SIZE, SHA256_MODE);
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if (memcmp(cert_hash, cert_hash_expected, 0x20) != 0)
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return 1;
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return 0;
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}
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u32 BuildFakeTicket(Ticket* ticket, u8* title_id) {
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const u8 sig_type[4] = { 0x00, 0x01, 0x00, 0x04 }; // RSA_2048 SHA256
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const u8 ticket_cnt_index[] = { // whatever this is
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0x00, 0x01, 0x00, 0x14, 0x00, 0x00, 0x00, 0xAC, 0x00, 0x00, 0x00, 0x14, 0x00, 0x01, 0x00, 0x14,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x28, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x84,
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0x00, 0x00, 0x00, 0x84, 0x00, 0x03, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFF, 0xFF, 0xFF, 0xFF,
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0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
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0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF
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};
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// set ticket all zero for a clean start
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memset(ticket, 0x00, sizeof(Ticket));
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// fill ticket values
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memcpy(ticket->sig_type, sig_type, 4);
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memset(ticket->signature, 0xFF, 0x100);
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snprintf((char*) ticket->issuer, 0x40, CIA_TICKET_ISSUER);
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memset(ticket->ecdsa, 0xFF, 0x3C);
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ticket->version = 0x01;
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memset(ticket->titlekey, 0xFF, 16);
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memcpy(ticket->title_id, title_id, 8);
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ticket->commonkey_idx = 0x01;
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ticket->audit = 0x01; // whatever
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memcpy(ticket->content_index, ticket_cnt_index, sizeof(ticket_cnt_index));
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return 0;
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}
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u32 BuildFakeTmd(TitleMetaData* tmd, u8* title_id, u32 n_contents) {
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const u8 sig_type[4] = { 0x00, 0x01, 0x00, 0x04 }; // RSA_2048 SHA256
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// safety check: number of contents
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if (n_contents > 64) return 1; // !!!
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// set TMD all zero for a clean start
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memset(tmd, 0x00, sizeof(TitleMetaData) + (n_contents * sizeof(TmdContentChunk)));
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// file TMD values
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memcpy(tmd->sig_type, sig_type, 4);
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memset(tmd->signature, 0xFF, 0x100);
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snprintf((char*) tmd->issuer, 0x40, CIA_TMD_ISSUER);
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tmd->version = 0x01;
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memcpy(tmd->title_id, title_id, 8);
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tmd->title_type[3] = 0x40; // whatever
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memset(tmd->save_size, 0x00, 4); // placeholder
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tmd->content_count[1] = (u8) n_contents;
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memset(tmd->contentinfo_hash, 0xFF, 0x20); // placeholder (hash)
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tmd->contentinfo[0].cmd_count[1] = (u8) n_contents;
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memset(tmd->contentinfo[0].hash, 0xFF, 0x20); // placeholder (hash)
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// nothing to do for content list (yet)
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return 0;
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}
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u32 DecryptCiaContent(u8* data, u32 size, u8* ctr, const u8* titlekey) {
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// WARNING: size and offset of data have to be a multiple of 16
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u8 tik[16] __attribute__((aligned(32)));
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u32 mode = AES_CNT_TITLEKEY_DECRYPT_MODE;
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memcpy(tik, titlekey, 16);
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setup_aeskey(0x11, tik);
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use_aeskey(0x11);
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cbc_decrypt(data, data, size / 16, mode, ctr);
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return 0;
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}
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