package com.google.bitcoin.bouncycastle.crypto.io; import java.io.FilterInputStream; import java.io.IOException; import java.io.InputStream; import com.google.bitcoin.bouncycastle.crypto.Mac; public class MacInputStream extends FilterInputStream { protected Mac mac; public MacInputStream( InputStream stream, Mac mac) { super(stream); this.mac = mac; } public int read() throws IOException { int b = in.read(); if (b >= 0) { mac.update((byte)b); } return b; } public int read( byte[] b, int off, int len) throws IOException { int n = in.read(b, off, len); if (n >= 0) { mac.update(b, off, n); } return n; } public Mac getMac() { return mac; } }