import org.spongycastle.openpgp.PGPCompressedData; //导入依赖的package包/类
public String encrypt(String plainText) throws NoSuchAlgorithmException, IOException, PGPException {
    byte[] rawText = plainText.getBytes();
    //This needs, like, three metric fucktons of explanation and/or cleaning up
    ByteArrayOutputStream encOut = new ByteArrayOutputStream();
    OutputStream out = new ArmoredOutputStream(encOut);
    ByteArrayOutputStream bOut = new ByteArrayOutputStream();
    PGPCompressedDataGenerator comData = new PGPCompressedDataGenerator(PGPCompressedData.ZIP);
    OutputStream cos = comData.open(bOut);
    PGPLiteralDataGenerator lData = new PGPLiteralDataGenerator();
    OutputStream pOut = lData.open(cos, PGPLiteralData.BINARY, PGPLiteralData.CONSOLE, rawText.length, new Date());
    pOut.write(rawText);
    lData.close();
    comData.close();
    BcPGPDataEncryptorBuilder builder = new BcPGPDataEncryptorBuilder(PGPEncryptedData.AES_256);
    builder.setWithIntegrityPacket(true);
    builder.setSecureRandom(new SecureRandom());
    PGPEncryptedDataGenerator cpk = new PGPEncryptedDataGenerator(builder);
    cpk.addMethod(new BcPublicKeyKeyEncryptionMethodGenerator(publicKey));
    byte[] bytes = bOut.toByteArray();
    OutputStream cOut = cpk.open(out, bytes.length);
    cOut.write(bytes);
    cOut.close();
    out.close();
    return new String(encOut.toByteArray(), Charset.forName("UTF-8"));
}
 

import org.spongycastle.openpgp.PGPCompressedData; //导入依赖的package包/类
public static boolean encryptFile(InputStream in, OutputStream out, File pubKeyFile,
                           boolean integrityCheck, Date fileDate,String filename){
    boolean status;
   try{
       PGPPublicKey encKey=MyPGPUtil.readPublicKey(new FileInputStream(pubKeyFile));
       Security.addProvider(new BouncyCastleProvider());

       PGPEncryptedDataGenerator cPk =
               new PGPEncryptedDataGenerator(
                       new JcePGPDataEncryptorBuilder(PGPEncryptedData.CAST5).
                               setWithIntegrityPacket(integrityCheck).
                               setSecureRandom(
                                       new SecureRandom()
                               )
               );

       cPk.addMethod(new JcePublicKeyKeyEncryptionMethodGenerator(encKey));

       OutputStream                cOut = cPk.open(out, new byte[1 << 16]);

       PGPCompressedDataGenerator comData = new PGPCompressedDataGenerator(
               PGPCompressedData.UNCOMPRESSED);

       PGPLiteralDataGenerator lData = new PGPLiteralDataGenerator();
       OutputStream pOut = lData.open(comData.open(cOut), PGPLiteralData.BINARY,filename ,fileDate, new byte[1 << 16]);
       PGPUtil.pipeDocumentFileContents(in,pOut, new byte[1 << 16].length);
       comData.close();

       cOut.close();
       Log.d(TAG,"file successfully encrypted");
       status=true;
   }catch (Exception ex){
       Log.d(TAG, "encryptFile: error in encrypting document file");
       ex.printStackTrace();
       status=false;
   }

    return status;
}
 

import org.spongycastle.openpgp.PGPCompressedData; //导入依赖的package包/类
@Override
public boolean encryptFile(File outputFile, File inputFile,
                         File pubKeyFile,Boolean integrityCheck
) throws Exception {
    OutputStream out = new BufferedOutputStream(new FileOutputStream(outputFile));
    String fileName=inputFile.getPath();
    PGPPublicKey encKey=keyManagement.getPublicKey(pubKeyFile);
    Security.addProvider(new BouncyCastleProvider());

    PGPEncryptedDataGenerator cPk =
            new PGPEncryptedDataGenerator(
                    new JcePGPDataEncryptorBuilder(PGPEncryptedData.CAST5).
                            setWithIntegrityPacket(integrityCheck).
                            setSecureRandom(
                                    new SecureRandom()
                            )
            );

    cPk.addMethod(new JcePublicKeyKeyEncryptionMethodGenerator(encKey));

    OutputStream                cOut = cPk.open(out, new byte[1 << 16]);

    PGPCompressedDataGenerator comData = new PGPCompressedDataGenerator(
            PGPCompressedData.UNCOMPRESSED);

    PGPUtil.writeFileToLiteralData(comData.open(cOut), PGPLiteralData.BINARY, new File(fileName), new byte[1 << 16]);

    comData.close();

    cOut.close();
    Log.d("encrypt","file successfully encrypted");
    return true;
}
 

import org.spongycastle.openpgp.PGPCompressedData; //导入依赖的package包/类
@Override
public boolean encryptFile(File inputFile, File outputFile, File keyFile, Boolean integrityCheck) throws Exception {
    try
    {
        byte[] bytes = MyPGPUtil.compressFile(inputFile.getAbsolutePath(),PGPCompressedData.ZIP);
        OutputStream out = new BufferedOutputStream(new FileOutputStream(outputFile));
        Security.addProvider(new BouncyCastleProvider());
        PGPEncryptedDataGenerator encGen = new PGPEncryptedDataGenerator(
                new JcePGPDataEncryptorBuilder(PGPEncryptedData.CAST5).setWithIntegrityPacket(integrityCheck).setSecureRandom(new SecureRandom()));
        PGPPublicKey key= MyPGPUtil.readPublicKey(new FileInputStream(keyFile));
        encGen.addMethod(new JcePublicKeyKeyEncryptionMethodGenerator(key).setProvider("BC"));

        OutputStream cOut = encGen.open(out, bytes.length);

        cOut.write(bytes);
        cOut.close();

        out.close();
        // if i got here means encryption was successful
        return true;

    }
    catch (PGPException e)
    {
        Log.i(TAG, "encryptFile: cannot encrypt file");
        if (e.getUnderlyingException() != null)
        {
            e.getUnderlyingException().printStackTrace();
        }
        return false;
    }

}
 

import org.spongycastle.openpgp.PGPCompressedData; //导入依赖的package包/类
private byte[] encryptData(String mime, CharSequence data)
        throws PGPException, IOException, SignatureException {

    String from = mKey.getUserId(mServer.getNetwork());
    String[] to = new String[mRecipients.length];
    for (int i = 0; i < to.length; i++)
        to[i] = PGP.getUserId(PGP.getMasterKey(mRecipients[i]), mServer.getNetwork());

    // secure the message against the most basic attacks using Message/CPIM
    CPIMMessage cpim = new CPIMMessage(from, to, new Date(), mime, data);
    byte[] plainText = cpim.toByteArray();

    ByteArrayOutputStream out = new ByteArrayOutputStream();
    ByteArrayInputStream in = new ByteArrayInputStream(plainText);

    // setup data encryptor & generator
    BcPGPDataEncryptorBuilder encryptor = new BcPGPDataEncryptorBuilder(PGPEncryptedData.AES_192);
    encryptor.setWithIntegrityPacket(true);
    encryptor.setSecureRandom(new SecureRandom());

    // add public key recipients
    PGPEncryptedDataGenerator encGen = new PGPEncryptedDataGenerator(encryptor);
    for (PGPPublicKeyRing rcpt : mRecipients)
        encGen.addMethod(new BcPublicKeyKeyEncryptionMethodGenerator(PGP.getEncryptionKey(rcpt)));

    OutputStream encryptedOut = encGen.open(out, new byte[BUFFER_SIZE]);

    // setup compressed data generator
    PGPCompressedDataGenerator compGen = new PGPCompressedDataGenerator(PGPCompressedData.ZIP);
    OutputStream compressedOut = compGen.open(encryptedOut, new byte[BUFFER_SIZE]);

    // setup signature generator
    PGPSignatureGenerator sigGen = new PGPSignatureGenerator
            (new BcPGPContentSignerBuilder(mKey.getSignKeyPair()
                .getPublicKey().getAlgorithm(), HashAlgorithmTags.SHA256));
    sigGen.init(PGPSignature.BINARY_DOCUMENT, mKey.getSignKeyPair().getPrivateKey());

    PGPSignatureSubpacketGenerator spGen = new PGPSignatureSubpacketGenerator();
    spGen.setSignerUserID(false, mKey.getUserId(mServer.getNetwork()));
    sigGen.setUnhashedSubpackets(spGen.generate());

    sigGen.generateOnePassVersion(false)
        .encode(compressedOut);

    // Initialize literal data generator
    PGPLiteralDataGenerator literalGen = new PGPLiteralDataGenerator();
    OutputStream literalOut = literalGen.open(
        compressedOut,
        PGPLiteralData.BINARY,
        "",
        new Date(),
        new byte[BUFFER_SIZE]);

    // read the "in" stream, compress, encrypt and write to the "out" stream
    // this must be done if clear data is bigger than the buffer size
    // but there are other ways to optimize...
    byte[] buf = new byte[BUFFER_SIZE];
    int len;
    while ((len = in.read(buf)) > 0) {
        literalOut.write(buf, 0, len);
        sigGen.update(buf, 0, len);
    }

    in.close();
    literalGen.close();
    // Generate the signature, compress, encrypt and write to the "out" stream
    sigGen.generate().encode(compressedOut);
    compGen.close();
    encGen.close();

    return out.toByteArray();
}
 

import org.spongycastle.openpgp.PGPCompressedData; //导入依赖的package包/类
@SuppressWarnings("deprecation")
public final static void encrypt(InputStream is, OutputStream os, byte[] publicKey) throws NoSuchProviderException, PGPException, IOException {
	
	BouncyCastleProvider bc = new BouncyCastleProvider();
	int bufferSize = 1 << 16;
	
	Security.addProvider(bc);
	
	OutputStream aos = new ArmoredOutputStream(os);
	
	PGPEncryptedDataGenerator edg = new PGPEncryptedDataGenerator(PGPEncryptedData.AES_256, true, new SecureRandom(), bc);
	edg.addMethod(KeyUtility.extractPublicKeyFromBytes(publicKey));
	OutputStream encOs = edg.open(aos, new byte[bufferSize]);
	
	PGPCompressedDataGenerator cdg = new PGPCompressedDataGenerator(PGPCompressedData.ZIP);
	OutputStream compOs = cdg.open(encOs);
	
	PGPLiteralDataGenerator ldg = new PGPLiteralDataGenerator();
	OutputStream litOs = ldg.open(compOs, PGPLiteralData.BINARY, PGPLiteralData.CONSOLE, new Date(System.currentTimeMillis()), new byte[bufferSize]);
	
	byte[] buf = new byte[bufferSize];
	
	int len;
	while((len = is.read(buf)) > 0)
		litOs.write(buf, 0, len);
	
	litOs.flush();
	litOs.close();
	ldg.close();
	
	compOs.flush();
	compOs.close();
	cdg.close();
	
	encOs.flush();
	encOs.close();
	edg.close();
	
	aos.close();
	
	is.close();
		
}