PR Bouncycastle article (#2882)

* Add bouncycastle depedencies * Add certificate and private key to resources folder * add bouncycastle code sample * Add bouncycastle test
2017-10-27 10:46:29 +01:00
parent dc349c17a8
commit 7489cf6eff
5 changed files with 199 additions and 0 deletions
@@ -0,0 +1,111 @@
+package com.baeldung.bouncycastle;
+
+import java.io.ByteArrayInputStream;
+import java.io.IOException;
+import java.security.PrivateKey;
+import java.security.cert.CertificateEncodingException;
+import java.security.cert.CertificateException;
+import java.security.cert.X509Certificate;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Iterator;
+import java.util.List;
+
+import org.bouncycastle.asn1.ASN1InputStream;
+import org.bouncycastle.asn1.cms.ContentInfo;
+import org.bouncycastle.cert.X509CertificateHolder;
+import org.bouncycastle.cert.jcajce.JcaCertStore;
+import org.bouncycastle.cms.CMSAlgorithm;
+import org.bouncycastle.cms.CMSEnvelopedData;
+import org.bouncycastle.cms.CMSEnvelopedDataGenerator;
+import org.bouncycastle.cms.CMSException;
+import org.bouncycastle.cms.CMSProcessableByteArray;
+import org.bouncycastle.cms.CMSSignedData;
+import org.bouncycastle.cms.CMSSignedDataGenerator;
+import org.bouncycastle.cms.CMSTypedData;
+import org.bouncycastle.cms.KeyTransRecipientInformation;
+import org.bouncycastle.cms.RecipientInformation;
+import org.bouncycastle.cms.SignerInformation;
+import org.bouncycastle.cms.SignerInformationStore;
+import org.bouncycastle.cms.jcajce.JcaSignerInfoGeneratorBuilder;
+import org.bouncycastle.cms.jcajce.JcaSimpleSignerInfoVerifierBuilder;
+import org.bouncycastle.cms.jcajce.JceCMSContentEncryptorBuilder;
+import org.bouncycastle.cms.jcajce.JceKeyTransEnvelopedRecipient;
+import org.bouncycastle.cms.jcajce.JceKeyTransRecipient;
+import org.bouncycastle.cms.jcajce.JceKeyTransRecipientInfoGenerator;
+import org.bouncycastle.operator.ContentSigner;
+import org.bouncycastle.operator.OperatorCreationException;
+import org.bouncycastle.operator.OutputEncryptor;
+import org.bouncycastle.operator.jcajce.JcaContentSignerBuilder;
+import org.bouncycastle.operator.jcajce.JcaDigestCalculatorProviderBuilder;
+import org.bouncycastle.util.Store;
+
+public class BouncyCastleCrypto {
+
+    public static byte[] signData(byte[] data, final X509Certificate signingCertificate, final PrivateKey signingKey)
+            throws CertificateEncodingException, OperatorCreationException, CMSException, IOException {
+        byte[] signedMessage = null;
+        List<X509Certificate> certList = new ArrayList<X509Certificate>();
+        CMSTypedData cmsData = new CMSProcessableByteArray(data);
+        certList.add(signingCertificate);
+        Store certs = new JcaCertStore(certList);
+        CMSSignedDataGenerator cmsGenerator = new CMSSignedDataGenerator();
+        ContentSigner contentSigner = new JcaContentSignerBuilder("SHA256withRSA").build(signingKey);
+        cmsGenerator.addSignerInfoGenerator(
+                new JcaSignerInfoGeneratorBuilder(new JcaDigestCalculatorProviderBuilder().setProvider("BC").build())
+                        .build(contentSigner, signingCertificate));
+        cmsGenerator.addCertificates(certs);
+        CMSSignedData cms = cmsGenerator.generate(cmsData, true);
+        signedMessage = cms.getEncoded();
+        return signedMessage;
+    }
+
+    public static boolean verifSignData(final byte[] signedData)
+            throws CMSException, IOException, OperatorCreationException, CertificateException {
+        ByteArrayInputStream bIn = new ByteArrayInputStream(signedData);
+        ASN1InputStream aIn = new ASN1InputStream(bIn);
+        CMSSignedData s = new CMSSignedData(ContentInfo.getInstance(aIn.readObject()));
+        aIn.close();
+        bIn.close();
+        Store certs = s.getCertificates();
+        SignerInformationStore signers = s.getSignerInfos();
+        Collection<SignerInformation> c = signers.getSigners();
+        SignerInformation signer = c.iterator().next();
+        Collection<X509CertificateHolder> certCollection = certs.getMatches(signer.getSID());
+        Iterator<X509CertificateHolder> certIt = certCollection.iterator();
+        X509CertificateHolder certHolder = certIt.next();
+        boolean verifResult = signer.verify(new JcaSimpleSignerInfoVerifierBuilder().build(certHolder));
+        if (!verifResult) {
+            return false;
+        }
+        return true;
+    }
+
+    public static byte[] encryptData(final byte[] data, X509Certificate encryptionCertificate)
+            throws CertificateEncodingException, CMSException, IOException {
+        byte[] encryptedData = null;
+        if (null != data && null != encryptionCertificate) {
+            CMSEnvelopedDataGenerator cmsEnvelopedDataGenerator = new CMSEnvelopedDataGenerator();
+            JceKeyTransRecipientInfoGenerator jceKey = new JceKeyTransRecipientInfoGenerator(encryptionCertificate);
+            cmsEnvelopedDataGenerator.addRecipientInfoGenerator(jceKey);
+            CMSTypedData msg = new CMSProcessableByteArray(data);
+            OutputEncryptor encryptor = new JceCMSContentEncryptorBuilder(CMSAlgorithm.AES128_CBC).setProvider("BC")
+                    .build();
+            CMSEnvelopedData cmsEnvelopedData = cmsEnvelopedDataGenerator.generate(msg, encryptor);
+            encryptedData = cmsEnvelopedData.getEncoded();
+        }
+        return encryptedData;
+    }
+
+    public static byte[] decryptData(final byte[] encryptedData, final PrivateKey decryptionKey) throws CMSException {
+        byte[] decryptedData = null;
+        if (null != encryptedData && null != decryptionKey) {
+            CMSEnvelopedData envelopedData = new CMSEnvelopedData(encryptedData);
+            Collection<RecipientInformation> recip = envelopedData.getRecipientInfos().getRecipients();
+            KeyTransRecipientInformation recipientInfo = (KeyTransRecipientInformation) recip.iterator().next();
+            JceKeyTransRecipient recipient = new JceKeyTransEnvelopedRecipient(decryptionKey);
+            decryptedData = recipientInfo.getContent(recipient);
+        }
+        return decryptedData;
+    }
+}