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The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. This jar contains APIs for JDK 1.5 and up. The APIs can be used in conjunction with a JCE/JCA provider such as the one provided with the Bouncy Castle Cryptography APIs.

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package org.bouncycastle.crypto.signers;

import java.util.Collections;
import java.util.HashMap;
import java.util.Map;

import org.bouncycastle.crypto.Digest;
import org.bouncycastle.util.Integers;

public class ISOTrailers
{
    private static final Map trailerMap;

    static final public int   TRAILER_IMPLICIT    = 0xBC;

    static final public int   TRAILER_RIPEMD160   = 0x31CC;
    static final public int   TRAILER_RIPEMD128   = 0x32CC;
    static final public int   TRAILER_SHA1        = 0x33CC;
    static final public int   TRAILER_SHA256      = 0x34CC;
    static final public int   TRAILER_SHA512      = 0x35CC;
    static final public int   TRAILER_SHA384      = 0x36CC;
    static final public int   TRAILER_WHIRLPOOL   = 0x37CC;
    static final public int   TRAILER_SHA224      = 0x38CC;
    static final public int   TRAILER_SHA512_224  = 0x39CC;
    static final public int   TRAILER_SHA512_256  = 0x3aCC;

    static
    {
        Map trailers = new HashMap();

        trailers.put("RIPEMD128", Integers.valueOf(TRAILER_RIPEMD128));
        trailers.put("RIPEMD160", Integers.valueOf(TRAILER_RIPEMD160));

        trailers.put("SHA-1", Integers.valueOf(TRAILER_SHA1));
        trailers.put("SHA-224", Integers.valueOf(TRAILER_SHA224));
        trailers.put("SHA-256", Integers.valueOf(TRAILER_SHA256));
        trailers.put("SHA-384", Integers.valueOf(TRAILER_SHA384));
        trailers.put("SHA-512", Integers.valueOf(TRAILER_SHA512));
        trailers.put("SHA-512/224", Integers.valueOf(TRAILER_SHA512_224));
        trailers.put("SHA-512/256", Integers.valueOf(TRAILER_SHA512_256));

        trailers.put("Whirlpool", Integers.valueOf(TRAILER_WHIRLPOOL));

        trailerMap = Collections.unmodifiableMap(trailers);
    }

    public static Integer getTrailer(Digest digest)
    {
        return (Integer)trailerMap.get(digest.getAlgorithmName());  // JDK 1.4 compatibility
    }

    public static boolean noTrailerAvailable(Digest digest)
    {
        return !trailerMap.containsKey(digest.getAlgorithmName());
    }
}