xci.c

#include <string.h>
#include "nsp.h"
#include "xci.h"
#include "rsa.h"

/* This RSA-PKCS1 public key is only accessible to the gamecard controller. */
/* However, it (and other XCI keys) can be dumped with a GCD attack on two signatures. */
/* Contact SciresM for details, if curious. */
const unsigned char xci_header_pubk[0x100] = {
    0x98, 0xC7, 0x26, 0xB6, 0x0D, 0x0A, 0x50, 0xA7, 0x39, 0x21, 0x0A, 0xE3, 0x2F, 0xE4, 0x3E, 0x2E, 
    0x5B, 0xA2, 0x86, 0x75, 0xAA, 0x5C, 0xEE, 0x34, 0xF1, 0xA3, 0x3A, 0x7E, 0xBD, 0x90, 0x4E, 0xF7, 
    0x8D, 0xFA, 0x17, 0xAA, 0x6B, 0xC6, 0x36, 0x6D, 0x4C, 0x9A, 0x6D, 0x57, 0x2F, 0x80, 0xA2, 0xBC, 
    0x38, 0x4D, 0xDA, 0x99, 0xA1, 0xD8, 0xC3, 0xE2, 0x99, 0x79, 0x36, 0x71, 0x90, 0x20, 0x25, 0x9D, 
    0x4D, 0x11, 0xB8, 0x2E, 0x63, 0x6B, 0x5A, 0xFA, 0x1E, 0x9C, 0x04, 0xD1, 0xC5, 0xF0, 0x9C, 0xB1, 
    0x0F, 0xB8, 0xC1, 0x7B, 0xBF, 0xE8, 0xB0, 0xD2, 0x2B, 0x47, 0x01, 0x22, 0x6B, 0x23, 0xC9, 0xD0, 
    0xBC, 0xEB, 0x75, 0x6E, 0x41, 0x7D, 0x4C, 0x26, 0xA4, 0x73, 0x21, 0xB4, 0xF0, 0x14, 0xE5, 0xD9, 
    0x8D, 0xB3, 0x64, 0xEE, 0xA8, 0xFA, 0x84, 0x1B, 0xB8, 0xB8, 0x7C, 0x88, 0x6B, 0xEF, 0xCC, 0x97, 
    0x04, 0x04, 0x9A, 0x67, 0x2F, 0xDF, 0xEC, 0x0D, 0xB2, 0x5F, 0xB5, 0xB2, 0xBD, 0xB5, 0x4B, 0xDE, 
    0x0E, 0x88, 0xA3, 0xBA, 0xD1, 0xB4, 0xE0, 0x91, 0x81, 0xA7, 0x84, 0xEB, 0x77, 0x85, 0x8B, 0xEF, 
    0xA5, 0xE3, 0x27, 0xB2, 0xF2, 0x82, 0x2B, 0x29, 0xF1, 0x75, 0x2D, 0xCE, 0xCC, 0xAE, 0x9B, 0x8D, 
    0xED, 0x5C, 0xF1, 0x8E, 0xDB, 0x9A, 0xD7, 0xAF, 0x42, 0x14, 0x52, 0xCD, 0xE3, 0xC5, 0xDD, 0xCE, 
    0x08, 0x12, 0x17, 0xD0, 0x7F, 0x1A, 0xAA, 0x1F, 0x7D, 0xE0, 0x93, 0x54, 0xC8, 0xBC, 0x73, 0x8A, 
    0xCB, 0xAD, 0x6E, 0x93, 0xE2, 0x19, 0x72, 0x6B, 0xD3, 0x45, 0xF8, 0x73, 0x3D, 0x2B, 0x6A, 0x55, 
    0xD2, 0x3A, 0x8B, 0xB0, 0x8A, 0x42, 0xE3, 0x3D, 0xF1, 0x92, 0x23, 0x42, 0x2E, 0xBA, 0xCC, 0x9C, 
    0x9A, 0xC1, 0xDD, 0x62, 0x86, 0x9C, 0x2E, 0xE1, 0x2D, 0x6F, 0x62, 0x67, 0x51, 0x08, 0x0E, 0xCF
};

void xci_process(xci_ctx_t *ctx) {
    fseeko64(ctx->file, 0, SEEK_SET);
    if (fread(&ctx->header, 1, 0x200, ctx->file) != 0x200) {
        fprintf(stderr, "Failed to read XCI header!\n");
        return;
    }
    
    if (ctx->header.magic != MAGIC_HEAD) {
        fprintf(stderr, "Error: XCI header is corrupt!\n");
        exit(EXIT_FAILURE);
    }

    ctx->hfs0_hash_validity = check_memory_hash_table(ctx->file, ctx->header.hfs0_header_hash, ctx->header.hfs0_offset, ctx->header.hfs0_header_size, ctx->header.hfs0_header_size, 0);
    if (ctx->hfs0_hash_validity != VALIDITY_VALID) {
        fprintf(stderr, "Error: XCI partition is corrupt!\n");
        exit(EXIT_FAILURE);
    }
    
    nxci_ctx_t blank_ctx;
    memset(&blank_ctx, 0, sizeof(blank_ctx));
    
    ctx->partition_ctx.file = ctx->file;
    ctx->partition_ctx.offset = ctx->header.hfs0_offset;
    ctx->partition_ctx.tool_ctx = &blank_ctx;
    ctx->partition_ctx.name = "rootpt";
    hfs0_process(&ctx->partition_ctx);
    
    if (ctx->partition_ctx.header->num_files > 4) {
        fprintf(stderr, "Error: Invalid XCI partition!\n");
        exit(EXIT_FAILURE);    
    }
    
    for (unsigned int i = 0; i < ctx->partition_ctx.header->num_files; i++)  {
        hfs0_ctx_t *cur_ctx = NULL;
        
        hfs0_file_entry_t *cur_file = hfs0_get_file_entry(ctx->partition_ctx.header, i);
        char *cur_name = hfs0_get_file_name(ctx->partition_ctx.header, i);
        if (!strcmp(cur_name, "update") && ctx->update_ctx.file == NULL) {
            cur_ctx = &ctx->update_ctx;
        } else if (!strcmp(cur_name, "normal") && ctx->normal_ctx.file == NULL) {
            cur_ctx = &ctx->normal_ctx;
        } else if (!strcmp(cur_name, "secure") && ctx->secure_ctx.file == NULL) {
            cur_ctx = &ctx->secure_ctx;
        } else if (!strcmp(cur_name, "logo") && ctx->logo_ctx.file == NULL) {
            cur_ctx = &ctx->logo_ctx;
        } 
        
        if (cur_ctx == NULL) {
            fprintf(stderr, "Unknown XCI partition: %s\n", cur_name);
            exit(EXIT_FAILURE);
        }
        
        cur_ctx->name = cur_name;
        cur_ctx->offset = ctx->partition_ctx.offset + hfs0_get_header_size(ctx->partition_ctx.header) + cur_file->offset;
        cur_ctx->tool_ctx = ctx->tool_ctx;
        cur_ctx->file = ctx->file;
        hfs0_process(cur_ctx);
    }
    
    for (unsigned int i = 0; i < 0x10; i++) {
        ctx->iv[i] = ctx->header.reversed_iv[0xF-i];
    }
    xci_save(ctx);

}

void xci_save(xci_ctx_t *ctx) {
    /* Save Secure Partition. */
	printf("Saving Secure Partition...\n");
	os_makedir(ctx->tool_ctx->settings.secure_dir_path.os_path);
	for (uint32_t i = 0; i < ctx->secure_ctx.header->num_files; i++) {
		hfs0_save_file(&ctx->secure_ctx, i, &ctx->tool_ctx->settings.secure_dir_path);
	}
	printf("\n");
}