mirror of
https://github.com/libretro/ppsspp.git
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130 lines
3.4 KiB
C
130 lines
3.4 KiB
C
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/*
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* PSP Software Development Kit - http://www.pspdev.org
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* -----------------------------------------------------------------------
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* Licensed under the BSD license, see LICENSE in PSPSDK root for details.
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*
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* hash.c - Hashing routines using sceChnnlsv
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*
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* Copyright (c) 2005 Jim Paris <jim@jtan.com>
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* Coypright (c) 2005 psp123
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*
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* $Id: hash.c 1560 2005-12-10 01:16:32Z jim $
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*/
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#include "hash.h"
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#include "psf.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <malloc.h>
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#include <pspchnnlsv.h>
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#include "kernelcall/kernelcall.h"
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static inline int align16(unsigned int v)
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{
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return ((v + 0xF) >> 4) << 4;
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}
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/* Update the hashes in the param.sfo data, using
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the given file hash, and by computing the param.sfo hashes.
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filehash must be a multiple of 16 bytes, and is reused to
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store other hashes. The filename is e.g. "DATA.BIN". */
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int update_hashes(unsigned char *data,
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int len,
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const char *filename,
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unsigned char *filehash,
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int encryptmode)
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{
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int alignedLen = align16(len);
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unsigned char *datafile, *savedata_params;
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int listLen, paramsLen;
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int ret;
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/* Locate SAVEDATA_PARAM section in the param.sfo. */
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if ((ret = find_psf_section("SAVEDATA_PARAMS", data, 0x1330,
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&savedata_params, ¶msLen)) < 0) {
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return ret - 100;
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}
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/* Locate the pointer for this DATA.BIN equivalent */
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if ((ret = find_psf_section("SAVEDATA_FILE_LIST", data, 0x1330,
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&datafile, &listLen)) < 0) {
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return ret - 200;
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}
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if ((ret = find_psf_datafile(filename, datafile,
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listLen, &datafile)) < 0) {
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return ret - 300;
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}
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/* Check minimum sizes based on where we want to write */
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if ((listLen < 0x20) || (paramsLen < 0x80)) {
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return -1;
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}
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/* Clear params and insert file hash */
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memset(savedata_params, 0, paramsLen);
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memcpy(datafile + 0x0D, filehash, 0x10);
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/* Compute 11D0 hash over entire file */
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if ((ret = build_hash(filehash, data, len, alignedLen,
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(encryptmode & 2) ? 4 : 2, NULL)) < 0) { // Not sure about "2"
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return ret - 400;
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}
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/* Copy 11D0 hash to param.sfo and set flag indicating it's there */
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memcpy(savedata_params + 0x20, filehash, 0x10);
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*savedata_params |= 0x01;
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/* If new encryption mode, compute and insert the 1220 hash. */
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if (encryptmode & 2) {
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/* Enable the hash bit first */
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*savedata_params |= 0x20;
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if ((ret = build_hash(filehash, data, len, alignedLen,
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3, 0)) < 0) {
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return ret - 500;
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}
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memcpy(savedata_params + 0x70, filehash, 0x10);
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}
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/* Compute and insert the 11C0 hash. */
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if ((ret = build_hash(filehash, data, len, alignedLen, 1, 0)) < 0) {
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return ret - 600;
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}
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memcpy(savedata_params + 0x10, filehash, 0x10);
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/* All done. */
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return 0;
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}
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/* Build a single hash using the given data and mode.
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data and alignedLen must be multiples of 0x10.
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cryptkey is NULL for savedata. */
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int build_hash(unsigned char *output,
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unsigned char *data,
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unsigned int len,
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unsigned int alignedLen,
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int mode,
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unsigned char *cryptkey)
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{
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pspChnnlsvContext1 ctx1;
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/* Set up buffers */
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memset(&ctx1, 0, sizeof(pspChnnlsvContext1));
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memset(output, 0, 0x10);
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memset(data + len, 0, alignedLen - len);
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/* Perform the magic */
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if (sceChnnlsv_E7833020_(&ctx1, mode & 0xFF) < 0)
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return -1;
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if (sceChnnlsv_F21A1FCA_(&ctx1, data, alignedLen) < 0)
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return -2;
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if (sceChnnlsv_C4C494F8_(&ctx1, output, cryptkey) < 0)
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return -3;
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/* All done. */
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return 0;
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}
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