ref: 7c9746aae0d265450fe6477189d4fa98082ca975
src/main/java/net/lulli/encrypt/pki/PkiEncryptionManager.java
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/* * This file is part of cert-encoder * Copyright (c) 2024 Paolo Lulli. * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, version 3. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ package net.lulli.encrypt.pki; import net.lulli.encrypt.Pems; import org.bouncycastle.cert.jcajce.JcaCertStore; import org.bouncycastle.cms.*; import org.bouncycastle.cms.jcajce.JcaSignerInfoGeneratorBuilder; import org.bouncycastle.cms.jcajce.JceCMSContentEncryptorBuilder; import org.bouncycastle.cms.jcajce.JceKeyTransEnvelopedRecipient; import org.bouncycastle.cms.jcajce.JceKeyTransRecipientInfoGenerator; import org.bouncycastle.jce.provider.BouncyCastleProvider; import org.bouncycastle.operator.ContentSigner; import org.bouncycastle.operator.jcajce.JcaContentSignerBuilder; import org.bouncycastle.operator.jcajce.JcaDigestCalculatorProviderBuilder; import org.bouncycastle.util.Store; import org.bouncycastle.util.encoders.Base64; import java.io.*; import java.nio.file.Files; import java.nio.file.Paths; import java.security.KeyStore; import java.security.PrivateKey; import java.security.PublicKey; import java.security.Security; import java.security.cert.X509Certificate; import java.util.ArrayList; public class PkiEncryptionManager { public static final PkiEncryptionManager INSTANCE = new PkiEncryptionManager(); private PkiEncryptionManager() {} public void signFile(File fileToSign) { try { char[] password = "yourpass".toCharArray(); String certificateAlias = ""; String keyAlias = ""; var keystoreFile = "full/path/to/your/original/certificate.pfx"; Security.addProvider(new BouncyCastleProvider()); KeyStore ks = loadKeyStore(keystoreFile, password); X509Certificate cert = (X509Certificate) ks.getCertificate(certificateAlias); PrivateKey privatekey = (PrivateKey) ks.getKey(keyAlias, password); String signatureFileName = fileToSign.getName().toString() + ".signature"; byte[] buffer = loadFileIntoBuffer(fileToSign); byte[] signeddata = generateSignature(cert, cert.getPublicKey(), privatekey, buffer); writeSignatureToFile(signatureFileName, signeddata); } catch (Exception e) { throw new IllegalStateException(e.getMessage()); } } private static byte[] loadFileIntoBuffer(File fileToSign) { try { byte[] buffer = new byte[(int) fileToSign.length()]; try (DataInputStream in = new DataInputStream(new FileInputStream(fileToSign))) { in.readFully(buffer); } return buffer; } catch (Exception e) { throw new IllegalStateException(e.getMessage()); } } private static byte[] generateSignature(X509Certificate cert, PublicKey publicKey, PrivateKey privatekey, byte[] buffer) { try { ArrayList<X509Certificate> certList = new ArrayList<X509Certificate>(); certList.add(cert); Store<?> certs = new JcaCertStore(certList); CMSSignedDataGenerator signGen = new CMSSignedDataGenerator(); ContentSigner sha1signer = new JcaContentSignerBuilder("SHA1withRSA").setProvider("BC").build(privatekey); signGen.addSignerInfoGenerator(new JcaSignerInfoGeneratorBuilder(new JcaDigestCalculatorProviderBuilder().build()).build(sha1signer, cert)); signGen.addCertificates(certs); CMSTypedData content = new CMSProcessableByteArray(buffer); CMSSignedData signedData = signGen.generate(content, false); byte[] signeddata = signedData.getEncoded(); return signeddata; } catch (Exception e) { throw new IllegalStateException(e.getMessage()); } } public byte[] encryptData(byte[] data, X509Certificate encryptionCertificate) { try { Security.addProvider(new BouncyCastleProvider()); if (null != data && null != encryptionCertificate) { var cmsEnvelopedDataGenerator = new CMSEnvelopedDataGenerator(); //JceKeyTransRecipientInfoGenerator jceKey = new JceKeyTransRecipientInfoGenerator(encryptionCertificate); cmsEnvelopedDataGenerator.addRecipientInfoGenerator(new JceKeyTransRecipientInfoGenerator(encryptionCertificate).setProvider("BC")); var cmsProcessableByteArray = new CMSProcessableByteArray(data); var outputEncryptor = new JceCMSContentEncryptorBuilder(CMSAlgorithm.AES256_CBC).setProvider("BC").build(); var cmsEnvelopedData = cmsEnvelopedDataGenerator.generate(cmsProcessableByteArray, outputEncryptor); return cmsEnvelopedData.getEncoded(); } return null; } catch (Exception e) { throw new IllegalStateException(e.getMessage()); } } public void decryptCms(PrivateKey privateKey, byte[] encryptedData, String destinationFile) { try { var decryptedDestination = new File(destinationFile); //byte[] encryptedData = Files.readAllBytes(encrypted.toPath()); var cmsEnvelopedDataParser = new CMSEnvelopedDataParser(encryptedData); var singleRecipient = getSingleRecipient(cmsEnvelopedDataParser); var jceKeyTransEnvelopedRecipient = new JceKeyTransEnvelopedRecipient(privateKey); try (InputStream decryptedStream = singleRecipient.getContentStream(jceKeyTransEnvelopedRecipient).getContentStream()) { Files.copy(decryptedStream, decryptedDestination.toPath()); } System.out.println(String.format("Decrypted to file :'%s'", decryptedDestination.getAbsolutePath())); } catch (Exception e) { throw new IllegalStateException(e.getMessage()); } } private static RecipientInformation getSingleRecipient(CMSEnvelopedDataParser parser) { var recInfos = parser.getRecipientInfos().getRecipients(); var recipientIterator = recInfos.iterator(); if (!recipientIterator.hasNext()) { throw new RuntimeException("Could not find recipient"); } return recipientIterator.next(); } private static void writeSignatureToFile(String fileName, byte[] signeddata) { try { var fileOutputStream = new FileOutputStream(fileName); byte[] outputString = Base64.encode(signeddata); int fullLines = (int) Math.floor(outputString.length / 64); for (int i = 0; i < fullLines; i++) { fileOutputStream.write(outputString, i * 64, 64); fileOutputStream.write("\r\n".getBytes()); } fileOutputStream.write(outputString, fullLines * 64, outputString.length % 64); fileOutputStream.close(); } catch (Exception e) { throw new IllegalStateException(e.getMessage()); } } private static KeyStore loadKeyStore(String keystoreFile, char[] password) { try { var keyStore = KeyStore.getInstance("PKCS12"); keyStore.load(new FileInputStream(keystoreFile), password); return keyStore; } catch (Exception e) { throw new IllegalStateException(e.getMessage()); } } /* public static void main(String[] args) throws Exception { var plainText = "this is a sample text"; X509Certificate x509Certificate = Pems.certificateFromFile("/home/plulli/.x509crypt/local/certs/local.crt"); //var enc = EncDec.encrypt(plainText, x509Certificate.getPublicKey().getEncoded()); byte[] enc = encryptData(plainText.getBytes(), x509Certificate); System.out.printf("Cleartext: [%s]\n Encrypted: [%s]\n", plainText, new String(enc)); Files.write(Paths.get("/tmp/output2.txt.enc"), enc); PrivateKey privateKey = Pems.privateKeyFromFile("/home/plulli/.x509crypt/local/certs/local.key"); decryptCms(privateKey, enc, "/tmp/output2.txt"); } */ } |