no.digipost.api.client.security.CryptoUtil.java Source code

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Here is the source code for no.digipost.api.client.security.CryptoUtil.java

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/**
 * Copyright (C) Posten Norge AS
 *
 * 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 no.digipost.api.client.security;

import java.io.InputStream;
import java.security.KeyStore;
import java.security.PrivateKey;
import java.security.Security;
import java.security.Signature;
import java.security.interfaces.RSAPrivateCrtKey;

import org.bouncycastle.cms.CMSAlgorithm;
import org.bouncycastle.cms.CMSException;
import org.bouncycastle.cms.jcajce.JceCMSContentEncryptorBuilder;
import org.bouncycastle.jce.provider.BouncyCastleProvider;

public class CryptoUtil {
    public static PrivateKey loadKeyFromP12(final InputStream certificateStream, final String passord) {
        RSAPrivateCrtKey key;
        try {
            KeyStore keyStore = KeyStore.getInstance("PKCS12");
            keyStore.load(certificateStream, passord.toCharArray());
            String onlyKeyAlias = keyStore.aliases().nextElement();
            key = (RSAPrivateCrtKey) keyStore.getKey(onlyKeyAlias, passord.toCharArray());
        } catch (Exception e) {
            throw new RuntimeException("Det skjedde en feil ved lasting av nkkelen", e);
        }
        if (key == null) {
            throw new RuntimeException("Nkkelen som ble lastet, var null");
        }
        return key;
    }

    public static byte[] sign(final PrivateKey privateKey, final String messageToSign) {
        Signature instance;
        try {
            instance = Signature.getInstance("SHA256WithRSAEncryption");
            instance.initSign(privateKey);
            instance.update(messageToSign.getBytes());
            return instance.sign();
        } catch (Exception e) {
            throw new RuntimeException("Det skjedde en feil ved signeringen", e);
        }
    }

    public static void verifyJCE() {
        try {
            if (Security.getProvider(BouncyCastleProvider.PROVIDER_NAME) == null) {
                Security.addProvider(new BouncyCastleProvider());
            }
            new JceCMSContentEncryptorBuilder(CMSAlgorithm.AES256_CBC)
                    .setProvider(BouncyCastleProvider.PROVIDER_NAME).build();
        } catch (CMSException e) {
            throw new RuntimeException(
                    "Feil under initialisering av algoritmer. Er Java Cryptographic Excetsions (JCE) installert?",
                    e);
        }
    }

}