?? macinputstream.java
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package org.bouncycastle.crypto.io;import java.io.FilterInputStream;import java.io.IOException;import java.io.InputStream;import org.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; }}
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