// Encrypt with AESCBC128 using keys from table.
private int executeKIRKCmd5(ByteBuffer @out, ByteBuffer @in, int size)
{
// Return an error if the crypto engine hasn't been initialized.
if (!CryptoEngine.CryptoEngineStatus)
{
return(PSP_KIRK_NOT_INIT);
}
int outPosition = @out.position();
// Read in the CMD4 format header.
AES128_CBC_Header header = new AES128_CBC_Header(@in);
if (header.mode != PSP_KIRK_CMD_MODE_ENCRYPT_CBC)
{
return(PSP_KIRK_INVALID_MODE); // Only valid for mode ENCRYPT_CBC.
}
if (header.dataSize == 0)
{
return(PSP_KIRK_DATA_SIZE_IS_ZERO);
}
sbyte[] key = null;
if (header.keySeed == 0x100)
{
key = priv_iv;
}
else
{
return(PSP_KIRK_INVALID_SIZE); // Dummy.
}
sbyte[] encKey = new sbyte[16];
for (int i = 0; i < encKey.Length; i++)
{
encKey[i] = (sbyte)key[i];
}
AES128 aes = new AES128("AES/CBC/NoPadding");
sbyte[] inBuf = new sbyte[header.dataSize];
@in.get(inBuf, 0, header.dataSize);
sbyte[] outBuf = aes.encrypt(inBuf, encKey, priv_iv);
@out.position(outPosition);
// The header is kept in the output and the header.mode is even updated from
// PSP_KIRK_CMD_MODE_ENCRYPT_CBC to PSP_KIRK_CMD_MODE_DECRYPT_CBC.
@out.putInt(PSP_KIRK_CMD_MODE_DECRYPT_CBC);
@out.putInt(header.unk1);
@out.putInt(header.unk2);
@out.putInt(header.keySeed);
@out.putInt(header.dataSize);
@out.put(outBuf);
@in.clear();
return(0);
}
// Decrypt with AESCBC128 using keys from table.
private int executeKIRKCmd7(ByteBuffer @out, ByteBuffer @in, int size)
{
// Return an error if the crypto engine hasn't been initialized.
if (!CryptoEngine.CryptoEngineStatus)
{
return(PSP_KIRK_NOT_INIT);
}
int outPosition = @out.position();
// Read in the CMD7 format header.
AES128_CBC_Header header = new AES128_CBC_Header(@in);
if (header.mode != PSP_KIRK_CMD_MODE_DECRYPT_CBC)
{
return(PSP_KIRK_INVALID_MODE); // Only valid for mode DECRYPT_CBC.
}
if (header.dataSize == 0)
{
return(PSP_KIRK_DATA_SIZE_IS_ZERO);
}
int[] key = getAESKeyFromSeed(header.keySeed);
if (key == null)
{
return(PSP_KIRK_INVALID_SEED);
}
sbyte[] decKey = new sbyte[16];
for (int i = 0; i < decKey.Length; i++)
{
decKey[i] = (sbyte)key[i];
}
AES128 aes = new AES128("AES/CBC/NoPadding");
sbyte[] inBuf = new sbyte[header.dataSize];
@in.get(inBuf, 0, header.dataSize);
sbyte[] outBuf = aes.decrypt(inBuf, decKey, priv_iv);
@out.position(outPosition);
@out.put(outBuf);
@in.clear();
return(0);
}
