com.webauthn4j.util.RSAUtil Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of webauthn4j-core Show documentation

WebAuthn4J Core library

There is a newer version: 0.9.2.RELEASE

/*
 * Copyright 2018 the original author or authors.
 *
 * 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
 *
 *      https://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 com.webauthn4j.util;

import com.webauthn4j.util.exception.UnexpectedCheckedException;
import org.jetbrains.annotations.NotNull;

import java.security.*;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.RSAKeyGenParameterSpec;
import java.security.spec.RSAPrivateKeySpec;
import java.security.spec.RSAPublicKeySpec;

public class RSAUtil {

    private RSAUtil() {
    }

    public static @NotNull PublicKey createPublicKey(@NotNull RSAPublicKeySpec rsaPublicKeySpec) {
        try {
            KeyFactory factory = KeyFactory.getInstance("RSA");
            return factory.generatePublic(rsaPublicKeySpec);
        } catch (InvalidKeySpecException | NoSuchAlgorithmException e) {
            throw new UnexpectedCheckedException(e);
        }
    }

    public static @NotNull PrivateKey createPrivateKey(@NotNull RSAPrivateKeySpec rsaPrivateKeySpec) {
        try {
            KeyFactory factory = KeyFactory.getInstance("RSA");
            return factory.generatePrivate(rsaPrivateKeySpec);
        } catch (InvalidKeySpecException | NoSuchAlgorithmException e) {
            throw new UnexpectedCheckedException(e);
        }
    }

    public static @NotNull KeyPair createKeyPair() {
        KeyPairGenerator keyPairGenerator;
        try {
            keyPairGenerator = KeyPairGenerator.getInstance("RSA");
            keyPairGenerator.initialize(new RSAKeyGenParameterSpec(2048, RSAKeyGenParameterSpec.F4), new SecureRandom());
        } catch (NoSuchAlgorithmException | InvalidAlgorithmParameterException e) {
            throw new UnexpectedCheckedException(e);
        }
        return keyPairGenerator.generateKeyPair();
    }
}