org.bouncycastle.operator.bc.BcDigestCalculatorProvider.java Source code

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Here is the source code for org.bouncycastle.operator.bc.BcDigestCalculatorProvider.java

Source

package org.bouncycastle.operator.bc;

import java.io.IOException;
import java.io.OutputStream;
import java.util.Map;

import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.crypto.Digest;
import org.bouncycastle.crypto.ExtendedDigest;
import org.bouncycastle.operator.DigestCalculator;
import org.bouncycastle.operator.DigestCalculatorProvider;
import org.bouncycastle.operator.OperatorCreationException;

public class BcDigestCalculatorProvider implements DigestCalculatorProvider {
    private BcDigestProvider digestProvider = BcDefaultDigestProvider.INSTANCE;

    public DigestCalculator get(final AlgorithmIdentifier algorithm) throws OperatorCreationException {
        Digest dig = digestProvider.get(algorithm);

        final DigestOutputStream stream = new DigestOutputStream(dig);

        return new DigestCalculator() {
            public AlgorithmIdentifier getAlgorithmIdentifier() {
                return algorithm;
            }

            public OutputStream getOutputStream() {
                return stream;
            }

            public byte[] getDigest() {
                return stream.getDigest();
            }
        };
    }

    private class DigestOutputStream extends OutputStream {
        private Digest dig;

        DigestOutputStream(Digest dig) {
            this.dig = dig;
        }

        public void write(byte[] bytes, int off, int len) throws IOException {
            dig.update(bytes, off, len);
        }

        public void write(byte[] bytes) throws IOException {
            dig.update(bytes, 0, bytes.length);
        }

        public void write(int b) throws IOException {
            dig.update((byte) b);
        }

        byte[] getDigest() {
            byte[] d = new byte[dig.getDigestSize()];

            dig.doFinal(d, 0);

            return d;
        }
    }
}