mirror of
https://github.com/hrydgard/ppsspp.git
synced 2024-11-30 17:02:19 +00:00
234 lines
5.3 KiB
C
234 lines
5.3 KiB
C
/*
|
|
* PSP Software Development Kit - http://www.pspdev.org
|
|
* -----------------------------------------------------------------------
|
|
* Licensed under the BSD license, see LICENSE in PSPSDK root for details.
|
|
*
|
|
* encrypt.c - Encryption routines using sceChnnlsv
|
|
*
|
|
* Copyright (c) 2005 Jim Paris <jim@jtan.com>
|
|
* Coypright (c) 2005 psp123
|
|
*
|
|
* $Id: encrypt.c 1560 2005-12-10 01:16:32Z jim $
|
|
*/
|
|
|
|
#include "encrypt.h"
|
|
#include "hash.h"
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <malloc.h>
|
|
#include <pspchnnlsv.h>
|
|
#include "kernelcall/kernelcall.h"
|
|
|
|
static inline int align16(unsigned int v)
|
|
{
|
|
return ((v + 0xF) >> 4) << 4;
|
|
}
|
|
|
|
int fopen_getsize(const char *filename, FILE **fd, int *size)
|
|
{
|
|
if ((*fd = fopen(filename, "r")) == NULL)
|
|
return -1;
|
|
|
|
fseek(*fd, 0, SEEK_END);
|
|
*size = ftell(*fd);
|
|
fseek(*fd, 0, SEEK_SET);
|
|
|
|
if (*size <= 0) {
|
|
fclose(*fd);
|
|
return -2;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Encrypt the given plaintext file, and update the message
|
|
authentication hashes in the param.sfo. The data_filename is
|
|
usually the final component of encrypted_filename, e.g. "DATA.BIN".
|
|
See main.c for an example of usage. */
|
|
int encrypt_file(const char *plaintext_filename,
|
|
const char *encrypted_filename,
|
|
const char *data_filename,
|
|
const char *paramsfo_filename,
|
|
const char *paramsfo_filename_out,
|
|
const unsigned char *gamekey,
|
|
const int mainSdkVersion)
|
|
{
|
|
FILE *in = NULL, *out = NULL, *sfo = NULL;
|
|
unsigned char *data = NULL, *cryptkey = NULL, *hash = NULL;
|
|
unsigned char paramsfo[0x1330];
|
|
int len, aligned_len, tmp;
|
|
int retval;
|
|
|
|
/* Open plaintext and param.sfo files and get size */
|
|
|
|
if (fopen_getsize(plaintext_filename, &in, &len) < 0) {
|
|
retval = -1;
|
|
goto out;
|
|
}
|
|
|
|
if (fopen_getsize(paramsfo_filename, &sfo, &tmp) < 0) {
|
|
retval = -2;
|
|
goto out;
|
|
}
|
|
|
|
/* Verify size of param.sfo; all known saves use this size */
|
|
|
|
if (tmp != 0x1330) {
|
|
retval = -3;
|
|
goto out;
|
|
}
|
|
|
|
/* Allocate buffers. data has 0x10 bytes extra for the IV. */
|
|
|
|
aligned_len = align16(len);
|
|
|
|
if ((data =
|
|
(unsigned char *) memalign(0x10, aligned_len + 0x10)) == NULL) {
|
|
retval = -4;
|
|
goto out;
|
|
}
|
|
|
|
if ((cryptkey = (unsigned char *) memalign(0x10, 0x10)) == NULL) {
|
|
retval = -5;
|
|
goto out;
|
|
}
|
|
|
|
if ((hash = (unsigned char *) memalign(0x10, 0x10)) == NULL) {
|
|
retval = -6;
|
|
goto out;
|
|
}
|
|
|
|
/* Fill buffers. */
|
|
|
|
memset(data + len, 0, aligned_len - len);
|
|
if (fread(data, 1, len, in) != len) {
|
|
retval = -7;
|
|
goto out;
|
|
}
|
|
|
|
if (fread(paramsfo, 1, 0x1330, sfo) != 0x1330) {
|
|
retval = -8;
|
|
goto out;
|
|
}
|
|
|
|
if (gamekey != NULL)
|
|
memcpy(cryptkey, gamekey, 0x10);
|
|
|
|
/* Do the encryption */
|
|
|
|
if ((retval = encrypt_data( gamekey ? (mainSdkVersion >= 4 ? 5 : 3) : 1, // 5 for sdk >= 4, 3 otherwise
|
|
data,
|
|
&len, &aligned_len,
|
|
hash,
|
|
gamekey ? cryptkey : NULL)) < 0) {
|
|
retval -= 1000;
|
|
goto out;
|
|
}
|
|
|
|
/* Update the param.sfo hashes */
|
|
|
|
if ((retval = update_hashes(paramsfo, 0x1330,
|
|
data_filename, hash,
|
|
gamekey ? 3 : 1)) < 0) {
|
|
retval -= 2000;
|
|
goto out;
|
|
}
|
|
|
|
/* Write the data to the file. encrypt_data has already set len. */
|
|
|
|
if ((out = fopen(encrypted_filename, "w")) == NULL) {
|
|
retval = -9;
|
|
goto out;
|
|
}
|
|
|
|
if (fwrite(data, 1, len, out) != len) {
|
|
retval = -10;
|
|
goto out;
|
|
}
|
|
|
|
/* Reopen param.sfo, and write the updated copy out. */
|
|
|
|
fclose(sfo);
|
|
if ((sfo = fopen(paramsfo_filename_out, "w")) == NULL) {
|
|
retval = -11;
|
|
goto out;
|
|
}
|
|
|
|
if (fwrite(paramsfo, 1, 0x1330, sfo) != 0x1330) {
|
|
retval = -12;
|
|
goto out;
|
|
}
|
|
|
|
/* All done. Return file length. */
|
|
|
|
retval = len;
|
|
|
|
out:
|
|
if(out) fclose(out);
|
|
if(hash) free(hash);
|
|
if(cryptkey) free(cryptkey);
|
|
if(data) free(data);
|
|
if(sfo) fclose(sfo);
|
|
if(in) fclose(in);
|
|
|
|
return retval;
|
|
}
|
|
|
|
/* Do the actual hardware encryption.
|
|
mode is 3 for saves with a cryptkey, or 1 otherwise
|
|
data, dataLen, and cryptkey must be multiples of 0x10.
|
|
cryptkey is NULL if mode == 1.
|
|
*/
|
|
int encrypt_data(unsigned int mode,
|
|
unsigned char *data,
|
|
int *dataLen,
|
|
int *alignedLen,
|
|
unsigned char *hash,
|
|
unsigned char *cryptkey)
|
|
{
|
|
pspChnnlsvContext1 ctx1;
|
|
pspChnnlsvContext2 ctx2;
|
|
|
|
/* Make room for the IV in front of the data. */
|
|
memmove(data + 0x10, data, *alignedLen);
|
|
|
|
/* Set up buffers */
|
|
memset(&ctx1, 0, sizeof(pspChnnlsvContext1));
|
|
memset(&ctx2, 0, sizeof(pspChnnlsvContext2));
|
|
memset(hash, 0, 0x10);
|
|
memset(data, 0, 0x10);
|
|
|
|
/* Build the 0x10-byte IV and setup encryption */
|
|
if (sceChnnlsv_ABFDFC8B_(&ctx2, mode, 1, data, cryptkey) < 0)
|
|
return -1;
|
|
if (sceChnnlsv_E7833020_(&ctx1, mode) < 0)
|
|
return -2;
|
|
if (sceChnnlsv_F21A1FCA_(&ctx1, data, 0x10) < 0)
|
|
return -3;
|
|
if (sceChnnlsv_850A7FA1_(&ctx2, data + 0x10, *alignedLen) < 0)
|
|
return -4;
|
|
|
|
/* Clear any extra bytes left from the previous steps */
|
|
memset(data + 0x10 + *dataLen, 0, *alignedLen - *dataLen);
|
|
|
|
/* Encrypt the data */
|
|
if (sceChnnlsv_F21A1FCA_(&ctx1, data + 0x10, *alignedLen) < 0)
|
|
return -5;
|
|
|
|
/* Verify encryption */
|
|
if (sceChnnlsv_21BE78B4_(&ctx2) < 0)
|
|
return -6;
|
|
|
|
/* Build the file hash from this PSP */
|
|
if (sceChnnlsv_C4C494F8_(&ctx1, hash, cryptkey) < 0)
|
|
return -7;
|
|
|
|
/* Adjust sizes to account for IV */
|
|
*alignedLen += 0x10;
|
|
*dataLen += 0x10;
|
|
|
|
/* All done */
|
|
return 0;
|
|
}
|