1 package org.bouncycastle.crypto.io; 2 3 import java.io.FilterInputStream; 4 import java.io.IOException; 5 import java.io.InputStream; 6 7 import org.bouncycastle.crypto.Digest; 8 9 public class DigestInputStream 10 extends FilterInputStream 11 { 12 protected Digest digest; 13 14 public DigestInputStream( 15 InputStream stream, 16 Digest digest) 17 { 18 super(stream); 19 this.digest = digest; 20 } 21 22 public int read() 23 throws IOException 24 { 25 int b = in.read(); 26 27 if (b >= 0) 28 { 29 digest.update((byte)b); 30 } 31 return b; 32 } 33 34 public int read( 35 byte[] b, 36 int off, 37 int len) 38 throws IOException 39 { 40 int n = in.read(b, off, len); 41 if (n > 0) 42 { 43 digest.update(b, off, n); 44 } 45 return n; 46 } 47 48 public Digest getDigest() 49 { 50 return digest; 51 } 52 } 53
