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The Bouncy Castle Java API for handling the OpenPGP protocol. This jar contains the OpenPGP API for JDK 1.5 to JDK 1.8. 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.bcpg;

/**
 * Utility methods related to OpenPGP public key algorithms.
 */
public class PublicKeyUtils
{

    /**
     * Return true, if the public key algorithm that corresponds to the given ID is capable of signing.
     *
     * @param publicKeyAlgorithm public key algorithm id
     * @return true if algorithm can sign
     */
    public static boolean isSigningAlgorithm(int publicKeyAlgorithm)
    {
        switch (publicKeyAlgorithm)
        {
        case PublicKeyAlgorithmTags.RSA_GENERAL:
        case PublicKeyAlgorithmTags.RSA_SIGN:
        case PublicKeyAlgorithmTags.DSA:
        case PublicKeyAlgorithmTags.ECDSA:
        case PublicKeyAlgorithmTags.ELGAMAL_GENERAL:
        case PublicKeyAlgorithmTags.EDDSA_LEGACY:
        case PublicKeyAlgorithmTags.Ed25519:
        case PublicKeyAlgorithmTags.Ed448:
            return true;
        default:
            return false;
        }
    }

//    /**
//     * Return true, if the public key algorithm that corresponds to the given ID is capable of encryption.
//     *
//     * @param publicKeyAlgorithm public key algorithm id
//     * @return true if algorithm can encrypt
//     */
//    public static boolean isEncryptionAlgorithm(int publicKeyAlgorithm)
//    {
//        switch (publicKeyAlgorithm)
//        {
//        case PublicKeyAlgorithmTags.RSA_GENERAL:
//        case PublicKeyAlgorithmTags.RSA_ENCRYPT:
//        case PublicKeyAlgorithmTags.ELGAMAL_ENCRYPT:
//        case PublicKeyAlgorithmTags.ECDH:
//        case PublicKeyAlgorithmTags.ELGAMAL_GENERAL:
//        case PublicKeyAlgorithmTags.DIFFIE_HELLMAN:
//        case PublicKeyAlgorithmTags.X25519:
//        case PublicKeyAlgorithmTags.X448:
//            return true;
//        default:
//            return false;
//        }
//    }
}