fi.aalto.cs.drumbeat.CertificateCommons.java Source code

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Here is the source code for fi.aalto.cs.drumbeat.CertificateCommons.java

Source

package fi.aalto.cs.drumbeat;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.security.Key;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.PrivateKey;
import java.security.SecureRandom;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;
import java.util.Date;

import org.bouncycastle.asn1.ASN1InputStream;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.x509.SubjectKeyIdentifier;
import org.bouncycastle.asn1.x509.SubjectPublicKeyInfo;
import org.bouncycastle.cert.X509v3CertificateBuilder;
import org.bouncycastle.cert.bc.BcX509ExtensionUtils;
import org.bouncycastle.cert.jcajce.JcaX509CertificateConverter;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.bouncycastle.operator.ContentSigner;
import org.bouncycastle.operator.OperatorCreationException;
import org.bouncycastle.operator.jcajce.JcaContentSignerBuilder;

/*
* 
Jyrki Oraskari, Aalto University, 2016 
    
This research has partly been carried out at Aalto University in DRUMBEAT 
Web-Enabled Construction Lifecycle (2014-2017) funded by Tekes, 
Aalto University, and the participating companies.
    
The MIT License (MIT)
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
    
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
    
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
*/

public class CertificateCommons {
    private static final String PROVIDER_NAME = BouncyCastleProvider.PROVIDER_NAME;
    private static final String KEY_GENERATION_ALGORITHM = "RSA";
    private static final String SIGNATURE_ALGORITHM = "SHA256WithRSAEncryption";
    public static final Date NOT_BEFORE = new Date(System.currentTimeMillis() - 86400000L * 365);
    public static final Date NOT_AFTER = new Date(System.currentTimeMillis() + 86400000L * 365 * 100);

    public static X509Certificate signCertificate(X509v3CertificateBuilder certificateBuilder,
            PrivateKey signedWithPrivateKey) throws OperatorCreationException, CertificateException {
        ContentSigner signer = new JcaContentSignerBuilder(SIGNATURE_ALGORITHM).setProvider(PROVIDER_NAME)
                .build(signedWithPrivateKey);
        return new JcaX509CertificateConverter().setProvider(PROVIDER_NAME)
                .getCertificate(certificateBuilder.build(signer));
    }

    public static KeyPair generateKeyPair(int keySize) {
        KeyPairGenerator generator = null;
        try {
            generator = KeyPairGenerator.getInstance(KEY_GENERATION_ALGORITHM, PROVIDER_NAME);
            generator.initialize(keySize, new SecureRandom());

        } catch (Exception e) {
            e.printStackTrace();
        }
        return generator.generateKeyPair();
    }

    public static SubjectKeyIdentifier createSubjectKeyIdentifier(Key key) throws IOException {
        ASN1InputStream is = null;
        try {
            is = new ASN1InputStream(new ByteArrayInputStream(key.getEncoded()));
            ASN1Sequence seq = (ASN1Sequence) is.readObject();
            @SuppressWarnings("deprecation")
            SubjectPublicKeyInfo info = new SubjectPublicKeyInfo(seq);
            return new BcX509ExtensionUtils().createSubjectKeyIdentifier(info);
        } finally {
            is.close();
        }
    }
}