protected override int DecryptBlock(byte[] inBuf, int inOff, int length, byte[] outBuf, int outOff)
{
byte[] dec;
if (fpeParameters.Radix > 256)
{
if ((length & 1) != 0)
{
throw new ArgumentException("input must be an even number of bytes for a wide radix");
}
ushort[] u16In = Pack.BE_To_UInt16(inBuf, inOff, length);
ushort[] u16Out = SP80038G.DecryptFF1w(baseCipher, fpeParameters.Radix, fpeParameters.GetTweak(),
u16In, 0, u16In.Length);
dec = Pack.UInt16_To_BE(u16Out, 0, u16Out.Length);
}
else
{
dec = SP80038G.DecryptFF1(baseCipher, fpeParameters.Radix, fpeParameters.GetTweak(), inBuf, inOff, length);
}
Array.Copy(dec, 0, outBuf, outOff, length);
return(length);
}
protected static ushort[] toShortArray(byte[] buf)
{
if ((buf.Length & 1) != 0)
{
throw new ArgumentException("data must be an even number of bytes for a wide radix");
}
ushort[] rv = new ushort[buf.Length / 2];
for (int i = 0; i != rv.Length; i++)
{
rv[i] = Pack.BE_To_UInt16(buf, i * 2);
}
return(rv);
}
