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fixed encryption and decryption

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piratesephiroth 2017-09-02 16:10:31 -03:00 committed by GitHub
parent 93422f88c8
commit 8f966731f6
1 changed files with 100 additions and 11 deletions
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111
Program.cs
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@ -1,4 +1,4 @@
using System;
using System;
using System.IO;
using System.Collections.Generic;
using System.Linq;
@ -333,6 +333,8 @@ namespace nfs2iso2nfs
partitionOffsets = sort(partitionOffsets, partitionOffsets.Length);
sizeInfo[0] = partitionOffsets[0];
byte[] IV = new byte[0x10];
byte[] decHashBlock = new byte[0x400];
byte[] encHashBlock = new byte[0x400];
int timer = 0;
int l = 0;
for (int i = 0; i < partitionOffsets.Length; i++)
@ -368,18 +370,52 @@ namespace nfs2iso2nfs
Console.WriteLine((l * 256) + " MB processed...");
}
timer++;
ew.Write(er.ReadBytes(0x3D0));
IV = er.ReadBytes(0x10);
ew.Write(IV);
ew.Write(er.ReadBytes(0x20));
Sector = er.ReadBytes(SECTOR_SIZE - 0x400);
Sector = aes_128_cbc(titlekey, IV, Sector, enc);
// NFS to ISO
if (enc)
{
Array.Clear(IV, 0, 0x10); // clear IV for encrypting hash block
decHashBlock = er.ReadBytes(0x400); // read raw hash table from nfs
encHashBlock = aes_128_cbc(titlekey, IV, decHashBlock, true); // encrypt table
ew.Write(encHashBlock); // write encrypted hash table to iso
//quit the loop if already at the end of input file or beyond (avoid the crash)
if (er.BaseStream.Position >= er.BaseStream.Length)
{
break;
}
Array.Copy(encHashBlock, 0x3D0, IV, 0, 0x10); // get IV for encrypting the rest
Sector = er.ReadBytes(SECTOR_SIZE - 0x400);
Sector = aes_128_cbc(titlekey, IV, Sector, enc); // encrypt the remaining bytes
}
// ISO to NFS
else
{
Array.Clear(IV, 0, 0x10); // clear IV for decrypting hash table
encHashBlock = er.ReadBytes(0x400); // read encrypted hash table from iso
decHashBlock = aes_128_cbc(titlekey, IV, encHashBlock, false); // decrypt block
ew.Write(decHashBlock); // write decrypted hash table to nfs
//quit the loop if already at the end of input file or beyond (avoid the crash)
if (er.BaseStream.Position >= er.BaseStream.Length)
{
break;
}
Array.Copy(encHashBlock, 0x3D0, IV, 0, 0x10); // IV for decrypting the remaining data
Sector = er.ReadBytes(SECTOR_SIZE - 0x400);
Sector = aes_128_cbc(titlekey, IV, Sector, false); // decrypt the remaining bytes
}
ew.Write(Sector);
partitionSize -= SECTOR_SIZE;
}
sizeInfo[1] = curPos - sizeInfo[0];
if (partitionSize != 0)
Console.WriteLine("Last cluster was not complete. This may be a problem.");
Console.WriteLine("WARNING: Last cluster was not complete. This may be a problem.");
}
if (enc)
{
@ -565,6 +601,7 @@ namespace nfs2iso2nfs
else
Console.WriteLine("Decrypting hif.nfs...");
Console.WriteLine();
byte[] block_iv = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1F, 0x00 };
byte[] Sector = new byte[SECTOR_SIZE];
int timer = 0;
int i = 0;
@ -580,10 +617,62 @@ namespace nfs2iso2nfs
}
timer++;
Sector = er.ReadBytes(leftSize > SECTOR_SIZE ? SECTOR_SIZE : (int)leftSize);
if (enc)
Sector = aes_128_cbc(key, iv, Sector, true);
else
if(ew.BaseStream.Position >= 0x18000) //use the different IVs if writing game partition data
{
iv = block_iv;
}
// ENCRYPTION
if (enc && ew.BaseStream.Position < 0x18000) // if encrypting and not game partition
{
Sector = aes_128_cbc(key, iv, Sector, true); // use zero IV
}
if (enc && ew.BaseStream.Position >= 0x18000) // if encrypting game partition
{
Sector = aes_128_cbc(key, block_iv, Sector, true); // use different IV for each block
block_iv[15]++; // increment the value after writing
if (block_iv[15] == 0) // and go further if necessary
{
block_iv[14]++;
if (block_iv[14] == 0)
{
block_iv[13]++;
if (block_iv[13] == 0)
{
block_iv[12]++; // I suppose it's a 4 byte value...?
} // it won't ever happen anyway
}
}
}
// DECRYPTION
if (!enc && ew.BaseStream.Position < 0x18000) // if decrypting and not game partition
{
Sector = aes_128_cbc(key, iv, Sector, false);
}
if (!enc && ew.BaseStream.Position >= 0x18000) // if decrypting game partition
{
Sector = aes_128_cbc(key, iv, Sector, false); // use different IV for each block
block_iv[15]++; // increment the value after writing
if (block_iv[15] == 0) // and go further if necessary
{
block_iv[14]++;
if (block_iv[14] == 0)
{
block_iv[13]++;
if (block_iv[13] == 0)
{
block_iv[12]++; // I suppose it's a 4 byte value...?
} // it won't ever happen anyway
}
}
}
//write it to outfile
ew.Write(Sector);