public SMFContext(SMFMode mode)
{
this.mode = mode;
this.isPadding = true;
this.iv = new byte[InputBlockSize];
this.sk = new long[32];
}
static private byte[] padding(byte[] input, SMFMode mode)
{
if (input == null)
{
return(null);
}
byte[] ret = (byte[])null;
if (mode == SMFMode.SM4_ENCRYPT)
{
int p = 16 - input.Length % 16;
ret = new byte[input.Length + p];
Array.Copy(input, 0, ret, 0, input.Length);
for (int i = 0; i < p; i++)
{
ret[input.Length + i] = (byte)p;
}
}
else
{
int p = input[input.Length - 1];
ret = new byte[input.Length - p];
Array.Copy(input, 0, ret, 0, input.Length - p);
}
return(ret);
}
