mirror of
https://github.com/d0k3/GodMode9.git
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76 lines
2.7 KiB
C
76 lines
2.7 KiB
C
#include "tmd.h"
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#include "sha.h"
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#include "ff.h"
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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 FixTmdHashes(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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// recalculate content info hashes
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for (u32 i = 0, kc = 0; i < 64 && kc < content_count; i++) {
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TmdContentInfo* info = tmd->contentinfo + i;
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u32 k = getbe16(info->cmd_count);
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sha_quick(info->hash, content_list + kc, k * sizeof(TmdContentChunk), SHA256_MODE);
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kc += k;
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}
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sha_quick(tmd->contentinfo_hash, (u8*)tmd->contentinfo, 64 * sizeof(TmdContentInfo), SHA256_MODE);
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return 0;
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}
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u32 BuildFakeTmd(TitleMetaData* tmd, u8* title_id, u32 n_contents, u32 save_size) {
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const u8 sig_type[4] = { TMD_SIG_TYPE };
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// safety check: number of contents
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if (n_contents > TMD_MAX_CONTENTS) return 1; // !!!
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// set TMD all zero for a clean start
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memset(tmd, 0x00, TMD_SIZE_N(n_contents));
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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, 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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for (u32 i = 0; i < 4; i++) tmd->save_size[i] = (save_size >> (i*8)) & 0xFF; // little endian?
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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 BuildTmdCert(u8* tmdcert) {
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const u8 cert_hash_expected[0x20] = {
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0x91, 0x5F, 0x77, 0x3A, 0x07, 0x82, 0xD4, 0x27, 0xC4, 0xCE, 0xF5, 0x49, 0x25, 0x33, 0xE8, 0xEC,
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0xF6, 0xFE, 0xA1, 0xEB, 0x8C, 0xCF, 0x59, 0x6E, 0x69, 0xBA, 0x2A, 0x38, 0x8D, 0x73, 0x8A, 0xE1
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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 TMD cert from 3 offsets
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f_lseek(&db, 0x3C10);
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f_read(&db, tmdcert + 0x000, 0x300, &bytes_read);
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f_lseek(&db, 0x0C10);
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f_read(&db, tmdcert + 0x300, 0x1F0, &bytes_read);
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f_lseek(&db, 0x3A00);
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f_read(&db, tmdcert + 0x4F0, 0x210, &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, tmdcert, TMD_CDNCERT_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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