jtulach@44: 
jtulach@44: package org.apidesign.api.security;
jtulach@44: 
jtulach@44: import java.nio.ByteBuffer;
jtulach@44: import org.apidesign.impl.security.friendapi.DigestImplementation;
jtulach@44: import org.apidesign.impl.security.friendapi.DigestProvider;
jtulach@44: import java.util.ServiceLoader;
jtulach@44: 
jtulach@44: /** MessageDigest extends MessageDigestSpi, that means the javadoc
jtulach@44:  *
jtulach@44:  * @author Jaroslav Tulach
jtulach@44:  */
jtulach@44: // BEGIN: day.end.bridges.Digest
jtulach@44: public final class Digest {
jtulach@44:     private final DigestImplementation impl;
jtulach@44:     
jtulach@44:     /** Factory method is better than constructor */
jtulach@44:     private Digest(DigestImplementation impl) {
jtulach@44:         this.impl = impl;
jtulach@44:     }
jtulach@44:     
jtulach@44:     /** Factory method to create digest for an algorithm.
jtulach@44:      */
jtulach@44:     public static Digest getInstance(String algorithm) {
jtulach@44:         for (DigestProvider dp : ServiceLoader.load(DigestProvider.class)) {
jtulach@44:             DigestImplementation impl = dp.create(algorithm);
jtulach@44:             if (impl != null) {
jtulach@44:                 return new Digest(impl);
jtulach@44:             }
jtulach@44:         }
jtulach@44:         throw new IllegalArgumentException(algorithm);
jtulach@44:     }
jtulach@44:       
jtulach@44:     //
jtulach@44:     // these methods are kept the same as in original MessageDigest,
jtulach@44:     // but for simplicity choose just some from the original API
jtulach@44:     //
jtulach@44:     
jtulach@44:     public byte[] digest(ByteBuffer bb) {
jtulach@44:         impl.update(bb);
jtulach@44:         return impl.digest();
jtulach@44:     }
jtulach@44: }
jtulach@44: // END: day.end.bridges.Digest