Generate the hash for an EMV CA public key

GenerateEMVCAPubKeyHash.java

import com.google.common.hash.HashCode;
import com.google.common.hash.Hashing;
import com.google.common.io.BaseEncoding;
import java.io.ByteArrayOutputStream;
import java.io.IOException;

public class GenerateEMVCAPubKeyHash {
    public static void main(String[] args) throws IOException {
        byte[] rid = BaseEncoding.base16().decode("");
        byte[] caPublicKeyIndex = BaseEncoding.base16().decode("");
        byte[] caPublicKeyMod = BaseEncoding.base16().decode("");
        byte[] caPublicKeyExp = BaseEncoding.base16().decode("");

        final ByteArrayOutputStream stream = new ByteArrayOutputStream(rid.length + caPublicKeyIndex.length + caPublicKeyMod.length + caPublicKeyExp.length);
        stream.write(rid, 0, rid.length);
        stream.write(caPublicKeyIndex, 0, caPublicKeyIndex.length);
        stream.write(caPublicKeyMod, 0, caPublicKeyMod.length);
        stream.write(caPublicKeyExp, 0, caPublicKeyExp.length);

        final HashCode signature = Hashing.sha1().hashBytes(stream.toByteArray());

        System.out.println(signature.toString());
    }
}