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The Bouncy Castle Java APIs for the TLS, including a JSSE provider. The APIs are designed primarily to be used in conjunction with the BC FIPS provider. The APIs may also be used with other providers although if being used in a FIPS context it is the responsibility of the user to ensure that any other providers used are FIPS certified and used appropriately.

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package org.bouncycastle.tls;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import org.bouncycastle.asn1.ASN1Encoding;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.x500.X500Name;
import org.bouncycastle.util.Arrays;

public class TrustedAuthority
{
    protected short identifierType;
    protected Object identifier;

    public TrustedAuthority(short identifierType, Object identifier)
    {
        if (!isCorrectType(identifierType, identifier))
        {
            throw new IllegalArgumentException("'identifier' is not an instance of the correct type");
        }

        this.identifierType = identifierType;
        this.identifier = identifier;
    }

    public short getIdentifierType()
    {
        return identifierType;
    }

    public Object getIdentifier()
    {
        return identifier;
    }

    public byte[] getCertSHA1Hash()
    {
        return Arrays.clone((byte[])identifier);
    }

    public byte[] getKeySHA1Hash()
    {
        return Arrays.clone((byte[])identifier);
    }

    public X500Name getX509Name()
    {
        checkCorrectType(IdentifierType.x509_name);
        return (X500Name)identifier;
    }

    /**
     * Encode this {@link TrustedAuthority} to an {@link OutputStream}.
     * 
     * @param output
     *            the {@link OutputStream} to encode to.
     * @throws IOException
     */
    public void encode(OutputStream output) throws IOException
    {
        TlsUtils.writeUint8(identifierType, output);

        switch (identifierType)
        {
        case IdentifierType.cert_sha1_hash:
        case IdentifierType.key_sha1_hash:
        {
            byte[] sha1Hash = (byte[])identifier;
            output.write(sha1Hash);
            break;
        }
        case IdentifierType.pre_agreed:
        {
            break;
        }
        case IdentifierType.x509_name:
        {
            X500Name dn = (X500Name)identifier;
            byte[] derEncoding = dn.getEncoded(ASN1Encoding.DER);
            TlsUtils.writeOpaque16(derEncoding, output);
            break;
        }
        default:
            throw new TlsFatalAlert(AlertDescription.internal_error);
        }
    }

    /**
     * Parse a {@link TrustedAuthority} from an {@link InputStream}.
     *
     * @param input
     *            the {@link InputStream} to parse from.
     * @return a {@link TrustedAuthority} object.
     * @throws IOException
     */
    public static TrustedAuthority parse(InputStream input) throws IOException
    {
        short identifier_type = TlsUtils.readUint8(input);
        Object identifier;

        switch (identifier_type)
        {
        case IdentifierType.cert_sha1_hash:
        case IdentifierType.key_sha1_hash:
        {
            identifier = TlsUtils.readFully(20, input);
            break;
        }
        case IdentifierType.pre_agreed:
        {
            identifier = null;
            break;
        }
        case IdentifierType.x509_name:
        {
            byte[] derEncoding = TlsUtils.readOpaque16(input, 1);
            ASN1Primitive asn1 = TlsUtils.readDERObject(derEncoding);
            identifier = X500Name.getInstance(asn1);
        }
        default:
            throw new TlsFatalAlert(AlertDescription.decode_error);
        }

        return new TrustedAuthority(identifier_type, identifier);
    }

    protected void checkCorrectType(short expectedIdentifierType)
    {
        if (this.identifierType != expectedIdentifierType
            || !isCorrectType(expectedIdentifierType, this.identifier))
        {
            throw new IllegalStateException("TrustedAuthority is not of type " + IdentifierType.getName(expectedIdentifierType));
        }
    }

    protected static boolean isCorrectType(short identifierType, Object identifier)
    {
        switch (identifierType)
        {
        case IdentifierType.cert_sha1_hash:
        case IdentifierType.key_sha1_hash:
            return isSHA1Hash(identifier);
        case IdentifierType.pre_agreed:
            return identifier == null;
        case IdentifierType.x509_name:
            return identifier instanceof X500Name;
        default:
            throw new IllegalArgumentException("'identifierType' is an unsupported IdentifierType");
        }
    }

    protected static boolean isSHA1Hash(Object identifier)
    {
        return identifier instanceof byte[] && ((byte[])identifier).length == 20;
    }
}