Digester Class — netty Architecture

Source Code

example/src/main/java/io/netty/example/ocsp/Digester.java lines 37–81

public final class Digester implements DigestCalculator {

    public static DigestCalculator sha1() {
        Digest digest = new SHA1Digest();
        AlgorithmIdentifier algId = new AlgorithmIdentifier(
                OIWObjectIdentifiers.idSHA1);

        return new Digester(digest, algId);
    }

    public static DigestCalculator sha256() {
        Digest digest = new SHA256Digest();

        // The OID for SHA-256: http://www.oid-info.com/get/2.16.840.1.101.3.4.2.1
        ASN1ObjectIdentifier oid = new ASN1ObjectIdentifier(
                "2.16.840.1.101.3.4.2.1").intern();
        AlgorithmIdentifier algId = new AlgorithmIdentifier(oid);

        return new Digester(digest, algId);
    }

    private final DigestOutputStream dos;

    private final AlgorithmIdentifier algId;

    private Digester(Digest digest, AlgorithmIdentifier algId) {
        this.dos = new DigestOutputStream(digest);
        this.algId = algId;
    }

    @Override
    public AlgorithmIdentifier getAlgorithmIdentifier() {
        return algId;
    }

    @Override
    public OutputStream getOutputStream() {
        return dos;
    }

    @Override
    public byte[] getDigest() {
        return dos.getDigest();
    }
}