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The jose.4.j library is a robust and easy to use open source implementation of JSON Web Token (JWT) and the JOSE specification suite (JWS, JWE, and JWK). It is written in Java and relies solely on the JCA APIs for cryptography. Please see https://bitbucket.org/b_c/jose4j/wiki/Home for more info, examples, etc..

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/*
 * Copyright 2012-2017 Brian Campbell
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.jose4j.keys;

import org.jose4j.lang.JoseException;

import java.math.BigInteger;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.SecureRandom;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.RSAPrivateCrtKeySpec;
import java.security.spec.RSAPrivateKeySpec;
import java.security.spec.RSAPublicKeySpec;

/**
 */
public class RsaKeyUtil extends KeyPairUtil
{
    public static final String RSA = "RSA";

    public RsaKeyUtil()
    {
        this(null, null);
    }

    public RsaKeyUtil(String provider, SecureRandom secureRandom)
    {
        super(provider, secureRandom);
    }

    @Override
    String getAlgorithm()
    {
        return RSA;
    }

    public RSAPublicKey publicKey(BigInteger modulus, BigInteger publicExponent) throws JoseException
    {
        RSAPublicKeySpec rsaPublicKeySpec = new RSAPublicKeySpec(modulus, publicExponent);
        try
        {
            PublicKey publicKey = getKeyFactory().generatePublic(rsaPublicKeySpec);
            return (RSAPublicKey) publicKey;
        }
        catch (InvalidKeySpecException e)
        {
            throw new JoseException("Invalid key spec: " + e, e);
        }
    }

    public RSAPrivateKey privateKey(BigInteger modulus, BigInteger privateExponent) throws JoseException
    {
        RSAPrivateKeySpec keySpec = new RSAPrivateKeySpec(modulus, privateExponent);
        return getRsaPrivateKey(keySpec);
    }

    public RSAPrivateKey privateKey(BigInteger modulus, BigInteger publicExponent, BigInteger privateExponent, BigInteger primeP,
                                    BigInteger primeQ, BigInteger primeExponentP, BigInteger primeExponentQ,
                                    BigInteger crtCoefficient) throws JoseException
    {
        RSAPrivateCrtKeySpec keySpec = new RSAPrivateCrtKeySpec(modulus,
                publicExponent, privateExponent, primeP, primeQ, primeExponentP, primeExponentQ, crtCoefficient);
        return getRsaPrivateKey(keySpec);
    }

    public RSAPrivateKey getRsaPrivateKey(RSAPrivateKeySpec keySpec) throws JoseException
    {
        try
        {
            PrivateKey privateKey = getKeyFactory().generatePrivate(keySpec);
            return (RSAPrivateKey) privateKey;
        }
        catch (InvalidKeySpecException e)
        {
            throw new JoseException("Invalid key spec: " + e, e);
        }
    }

    public KeyPair generateKeyPair(int bits) throws JoseException
    {
        KeyPairGenerator keyGenerator = getKeyPairGenerator();
        if (secureRandom == null)
        {
            keyGenerator.initialize(bits);
        }
        else
        {
            keyGenerator.initialize(bits, secureRandom);
        }
        return keyGenerator.generateKeyPair();
    }
}