java - desencriptar - Cómo encriptar una cadena/secuencia con bouncycastle pgp sin comenzar con un archivo

encriptar y desencriptar en java netbeans

Question

Necesito encriptar una secuencia con pgp usando el proveedor de bouncycastle. Todos los ejemplos que puedo encontrar se refieren a tomar un archivo de texto plano y encriptarlo; sin embargo, no tendré un archivo y es importante que el texto plano nunca se escriba en el disco.

La mayoría de los métodos que he visto están usando

PGPUtil.writeFileToLiteralData que quiere pasar el texto plano. Prefiero pasar un byte [] o un inputStream.

¿Puede alguien señalarme un ejemplo que

• comienza desde cadena / byte [] / inputstream
• encripta dicho string / byte [] a un outputStrem que puedo escribir en un archivo
• descifra de un inputStream

En caso de que alguien más se tropiece con esto y quiere la solución completa

package com.common.security.pgp;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.security.NoSuchProviderException;
import java.security.SecureRandom;
import java.security.Security;
import java.util.Date;
import java.util.Iterator;

import org.bouncycastle.bcpg.ArmoredOutputStream;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.bouncycastle.openpgp.PGPCompressedData;
import org.bouncycastle.openpgp.PGPCompressedDataGenerator;
import org.bouncycastle.openpgp.PGPEncryptedData;
import org.bouncycastle.openpgp.PGPEncryptedDataGenerator;
import org.bouncycastle.openpgp.PGPEncryptedDataList;
import org.bouncycastle.openpgp.PGPException;
import org.bouncycastle.openpgp.PGPLiteralData;
import org.bouncycastle.openpgp.PGPLiteralDataGenerator;
import org.bouncycastle.openpgp.PGPObjectFactory;
import org.bouncycastle.openpgp.PGPPrivateKey;
import org.bouncycastle.openpgp.PGPPublicKey;
import org.bouncycastle.openpgp.PGPPublicKeyEncryptedData;
import org.bouncycastle.openpgp.PGPPublicKeyRing;
import org.bouncycastle.openpgp.PGPPublicKeyRingCollection;
import org.bouncycastle.openpgp.PGPSecretKey;
import org.bouncycastle.openpgp.PGPSecretKeyRingCollection;
import org.bouncycastle.openpgp.PGPUtil;

/**
 * Simple routine to encrypt and decrypt using a Public and Private key with passphrase. This service
 * routine provides the basic PGP services between byte arrays.
 * 
 */
public class PgpEncryption {


    private static PGPPrivateKey findSecretKey(
            PGPSecretKeyRingCollection pgpSec, long keyID, char[] pass)
            throws PGPException, NoSuchProviderException {
        PGPSecretKey pgpSecKey = pgpSec.getSecretKey(keyID);

        if (pgpSecKey == null) {
            return null;
        }

        return pgpSecKey.extractPrivateKey(pass, "BC");
    }

    /**
     * decrypt the passed in message stream
     * 
     * @param encrypted
     *            The message to be decrypted.
     * @param passPhrase
     *            Pass phrase (key)
     * 
     * @return Clear text as a byte array. I18N considerations are not handled
     *         by this routine
     * @exception IOException
     * @exception PGPException
     * @exception NoSuchProviderException
     */
    public static byte[] decrypt(byte[] encrypted, InputStream keyIn, char[] password)
            throws IOException, PGPException, NoSuchProviderException {
        InputStream in = new ByteArrayInputStream(encrypted);

        in = PGPUtil.getDecoderStream(in);

        PGPObjectFactory pgpF = new PGPObjectFactory(in);
        PGPEncryptedDataList enc = null;
        Object o = pgpF.nextObject();

        //
        // the first object might be a PGP marker packet.
        //
        if (o instanceof PGPEncryptedDataList) {
            enc = (PGPEncryptedDataList) o;
        } else {
            enc = (PGPEncryptedDataList) pgpF.nextObject();
        }



        //
        // find the secret key
        //
        Iterator it = enc.getEncryptedDataObjects();
        PGPPrivateKey sKey = null;
        PGPPublicKeyEncryptedData pbe = null;
        PGPSecretKeyRingCollection pgpSec = new PGPSecretKeyRingCollection(
                PGPUtil.getDecoderStream(keyIn));

        while (sKey == null && it.hasNext()) {
            pbe = (PGPPublicKeyEncryptedData) it.next();

            sKey = findSecretKey(pgpSec, pbe.getKeyID(), password);
        }

        if (sKey == null) {
            throw new IllegalArgumentException(
                    "secret key for message not found.");
        }

        InputStream clear = pbe.getDataStream(sKey, "BC");



        PGPObjectFactory pgpFact = new PGPObjectFactory(clear);

        PGPCompressedData cData = (PGPCompressedData) pgpFact.nextObject();

        pgpFact = new PGPObjectFactory(cData.getDataStream());

        PGPLiteralData ld = (PGPLiteralData) pgpFact.nextObject();

        InputStream unc = ld.getInputStream();

        ByteArrayOutputStream out = new ByteArrayOutputStream();
        int ch;

        while ((ch = unc.read()) >= 0) {
            out.write(ch);

        }

        byte[] returnBytes = out.toByteArray();
        out.close();
        return returnBytes;
    }

    /**
     * Simple PGP encryptor between byte[].
     * 
     * @param clearData
     *            The test to be encrypted
     * @param passPhrase
     *            The pass phrase (key). This method assumes that the key is a
     *            simple pass phrase, and does not yet support RSA or more
     *            sophisiticated keying.
     * @param fileName
     *            File name. This is used in the Literal Data Packet (tag 11)
     *            which is really inly important if the data is to be related to
     *            a file to be recovered later. Because this routine does not
     *            know the source of the information, the caller can set
     *            something here for file name use that will be carried. If this
     *            routine is being used to encrypt SOAP MIME bodies, for
     *            example, use the file name from the MIME type, if applicable.
     *            Or anything else appropriate.
     * 
     * @param armor
     * 
     * @return encrypted data.
     * @exception IOException
     * @exception PGPException
     * @exception NoSuchProviderException
     */
    public static byte[] encrypt(byte[] clearData, PGPPublicKey encKey,
            String fileName,boolean withIntegrityCheck, boolean armor)
            throws IOException, PGPException, NoSuchProviderException {
        if (fileName == null) {
            fileName = PGPLiteralData.CONSOLE;
        }

        ByteArrayOutputStream encOut = new ByteArrayOutputStream();

        OutputStream out = encOut;
        if (armor) {
            out = new ArmoredOutputStream(out);
        }

        ByteArrayOutputStream bOut = new ByteArrayOutputStream();

        PGPCompressedDataGenerator comData = new PGPCompressedDataGenerator(
                PGPCompressedDataGenerator.ZIP);
        OutputStream cos = comData.open(bOut); // open it with the final
        // destination
        PGPLiteralDataGenerator lData = new PGPLiteralDataGenerator();

        // we want to generate compressed data. This might be a user option
        // later,
        // in which case we would pass in bOut.
        OutputStream pOut = lData.open(cos, // the compressed output stream
                PGPLiteralData.BINARY, fileName, // "filename" to store
                clearData.length, // length of clear data
                new Date() // current time
                );
        pOut.write(clearData);

        lData.close();
        comData.close();

        PGPEncryptedDataGenerator cPk = new PGPEncryptedDataGenerator(
                PGPEncryptedData.CAST5, withIntegrityCheck, new SecureRandom(),
                "BC");

        cPk.addMethod(encKey);

        byte[] bytes = bOut.toByteArray();

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

        cOut.write(bytes); // obtain the actual bytes from the compressed stream

        cOut.close();

        out.close();

        return encOut.toByteArray();
    }

    private static PGPPublicKey readPublicKey(InputStream in)
            throws IOException, PGPException {
        in = PGPUtil.getDecoderStream(in);

        PGPPublicKeyRingCollection pgpPub = new PGPPublicKeyRingCollection(in);

        //
        // we just loop through the collection till we find a key suitable for
        // encryption, in the real
        // world you would probably want to be a bit smarter about this.
        //

        //
        // iterate through the key rings.
        //
        Iterator rIt = pgpPub.getKeyRings();

        while (rIt.hasNext()) {
            PGPPublicKeyRing kRing = (PGPPublicKeyRing) rIt.next();
            Iterator kIt = kRing.getPublicKeys();

            while (kIt.hasNext()) {
                PGPPublicKey k = (PGPPublicKey) kIt.next();

                if (k.isEncryptionKey()) {
                    return k;
                }
            }
        }

        throw new IllegalArgumentException(
                "Can''t find encryption key in key ring.");
    }

    public static byte[] getBytesFromFile(File file) throws IOException {
        InputStream is = new FileInputStream(file);

        // Get the size of the file
        long length = file.length();

        if (length > Integer.MAX_VALUE) {
            // File is too large
        }

        // Create the byte array to hold the data
        byte[] bytes = new byte[(int)length];

        // Read in the bytes
        int offset = 0;
        int numRead = 0;
        while (offset < bytes.length
               && (numRead=is.read(bytes, offset, bytes.length-offset)) >= 0) {
            offset += numRead;
        }

        // Ensure all the bytes have been read in
        if (offset < bytes.length) {
            throw new IOException("Could not completely read file "+file.getName());
        }

        // Close the input stream and return bytes
        is.close();
        return bytes;
    }

    public static void main(String[] args) throws Exception {
        Security.addProvider(new BouncyCastleProvider());


        byte[] original = "Hello world".getBytes();
        System.out.println("Starting PGP test");

        FileInputStream pubKey = new FileInputStream("/Users/me/pub.key");
        byte[] encrypted = encrypt(original, readPublicKey(pubKey), null,
                true, true);

        FileOutputStream dfis = new FileOutputStream("/Users/me/enc.asc");
        dfis.write(encrypted);
        dfis.close();

        byte[] encFromFile = getBytesFromFile(new File("/Users/me/enc.asc"));
        FileInputStream secKey = new FileInputStream("/Users/me/sec.key");

        System.out.println("/nencrypted data = ''" + new String(encrypted) + "''");

        byte[] decrypted = decrypt(encFromFile, secKey, "passphrase".toCharArray());

        System.out.println("/ndecrypted data = ''" + new String(decrypted) + "''");


    }
}

Answer 1

Al observar la fuente de PGPUtil , puede ver a qué API llamar cuando trabaje con transmisiones o arreglos directamente:

public static void writeFileToLiteralData(OutputStream out,
               char fileType, File file, byte[] buffer) throws IOException {
   PGPLiteralDataGenerator lData = new PGPLiteralDataGenerator();
   OutputStream pOut = lData.open(out, fileType, file.getName(),
                   new Date(file.lastModified()), buffer);
   FileInputStream in = new FileInputStream(file);
   byte[] buf = new byte[buffer.length];
   int len;

   while ((len = in.read(buf)) > 0) {
         pOut.write(buf, 0, len);
   }

   lData.close();
   in.close();
}

Answer 2

Encontrado en el repositorio grepcode - fuentes payneteasy superfly

private static void writeBytesToLiteralData(OutputStream out,
    char fileType, String name, byte[] bytes) throws IOException {
        PGPLiteralDataGenerator lData = new PGPLiteralDataGenerator();
        OutputStream pOut = lData.open(out, fileType, name,bytes.length, new Date());
        pOut.write(bytes);
}

Answer 3

Tu código fue extremadamente útil para mí. Estoy trabajando en ColdFusion (con Java) y necesito tomar contraseñas, codificarlas en un archivo de importación corto para LDIFDE (para ser utilizado en Active Directory en otro servidor) y nunca quise que las contraseñas toquen el disco en texto plano. Lo modifiqué solo ligeramente para agregar dos funciones que resumen el caso de uso común de cifrar una cadena en el disco y descifrarla desde el disco. Gracias @dstarh.

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.security.NoSuchProviderException;
import java.security.SecureRandom;
import java.security.Security;
import java.util.Date;
import java.util.Iterator;

import org.bouncycastle.bcpg.ArmoredOutputStream;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.bouncycastle.openpgp.PGPCompressedData;
import org.bouncycastle.openpgp.PGPCompressedDataGenerator;
import org.bouncycastle.openpgp.PGPEncryptedData;
import org.bouncycastle.openpgp.PGPEncryptedDataGenerator;
import org.bouncycastle.openpgp.PGPEncryptedDataList;
import org.bouncycastle.openpgp.PGPException;
import org.bouncycastle.openpgp.PGPLiteralData;
import org.bouncycastle.openpgp.PGPLiteralDataGenerator;
import org.bouncycastle.openpgp.PGPObjectFactory;
import org.bouncycastle.openpgp.PGPPrivateKey;
import org.bouncycastle.openpgp.PGPPublicKey;
import org.bouncycastle.openpgp.PGPPublicKeyEncryptedData;
import org.bouncycastle.openpgp.PGPPublicKeyRing;
import org.bouncycastle.openpgp.PGPPublicKeyRingCollection;
import org.bouncycastle.openpgp.PGPSecretKey;
import org.bouncycastle.openpgp.PGPSecretKeyRingCollection;
import org.bouncycastle.openpgp.PGPUtil;

/**
 * Simple routine to encrypt and decrypt using a Public and Private key with passphrase. This service
 * routine provides the basic PGP services between byte arrays.
 * 
 */
public class PgpEncryption {

    public PgpEncryption() {
        // Empty constructor
    }

    private static PGPPrivateKey findSecretKey(
            PGPSecretKeyRingCollection pgpSec, long keyID, char[] pass)
            throws PGPException, NoSuchProviderException {
        PGPSecretKey pgpSecKey = pgpSec.getSecretKey(keyID);

        if (pgpSecKey == null) {
            return null;
        }

        return pgpSecKey.extractPrivateKey(pass, "BC");
    }

    /**
     * decrypt the passed in message stream
     * 
     * @param encrypted
     *            The message to be decrypted.
     * @param passPhrase
     *            Pass phrase (key)
     * 
     * @return Clear text as a byte array. I18N considerations are not handled
     *         by this routine
     * @exception IOException
     * @exception PGPException
     * @exception NoSuchProviderException
     */
    public static byte[] decrypt(byte[] encrypted, InputStream keyIn, char[] password)
            throws IOException, PGPException, NoSuchProviderException {
        InputStream in = new ByteArrayInputStream(encrypted);

        in = PGPUtil.getDecoderStream(in);

        PGPObjectFactory pgpF = new PGPObjectFactory(in);
        PGPEncryptedDataList enc = null;
        Object o = pgpF.nextObject();

        //
        // the first object might be a PGP marker packet.
        //
        if (o instanceof PGPEncryptedDataList) {
            enc = (PGPEncryptedDataList) o;
        } else {
            enc = (PGPEncryptedDataList) pgpF.nextObject();
        }



        //
        // find the secret key
        //
        Iterator it = enc.getEncryptedDataObjects();
        PGPPrivateKey sKey = null;
        PGPPublicKeyEncryptedData pbe = null;
        PGPSecretKeyRingCollection pgpSec = new PGPSecretKeyRingCollection(
                PGPUtil.getDecoderStream(keyIn));

        while (sKey == null && it.hasNext()) {
            pbe = (PGPPublicKeyEncryptedData) it.next();

            sKey = findSecretKey(pgpSec, pbe.getKeyID(), password);
        }

        if (sKey == null) {
            throw new IllegalArgumentException(
                    "secret key for message not found.");
        }

        InputStream clear = pbe.getDataStream(sKey, "BC");



        PGPObjectFactory pgpFact = new PGPObjectFactory(clear);

        PGPCompressedData cData = (PGPCompressedData) pgpFact.nextObject();

        pgpFact = new PGPObjectFactory(cData.getDataStream());

        PGPLiteralData ld = (PGPLiteralData) pgpFact.nextObject();

        InputStream unc = ld.getInputStream();

        ByteArrayOutputStream out = new ByteArrayOutputStream();
        int ch;

        while ((ch = unc.read()) >= 0) {
            out.write(ch);

        }

        byte[] returnBytes = out.toByteArray();
        out.close();
        return returnBytes;
    }

    /**
     * Simple PGP encryptor between byte[].
     * 
     * @param clearData
     *            The test to be encrypted
     * @param passPhrase
     *            The pass phrase (key). This method assumes that the key is a
     *            simple pass phrase, and does not yet support RSA or more
     *            sophisiticated keying.
     * @param fileName
     *            File name. This is used in the Literal Data Packet (tag 11)
     *            which is really inly important if the data is to be related to
     *            a file to be recovered later. Because this routine does not
     *            know the source of the information, the caller can set
     *            something here for file name use that will be carried. If this
     *            routine is being used to encrypt SOAP MIME bodies, for
     *            example, use the file name from the MIME type, if applicable.
     *            Or anything else appropriate.
     * 
     * @param armor
     * 
     * @return encrypted data.
     * @exception IOException
     * @exception PGPException
     * @exception NoSuchProviderException
     */
    public static byte[] encrypt(byte[] clearData, PGPPublicKey encKey,
            String fileName,boolean withIntegrityCheck, boolean armor)
            throws IOException, PGPException, NoSuchProviderException {
        if (fileName == null) {
            fileName = PGPLiteralData.CONSOLE;
        }

        ByteArrayOutputStream encOut = new ByteArrayOutputStream();

        OutputStream out = encOut;
        if (armor) {
            out = new ArmoredOutputStream(out);
        }

        ByteArrayOutputStream bOut = new ByteArrayOutputStream();

        PGPCompressedDataGenerator comData = new PGPCompressedDataGenerator(
                PGPCompressedDataGenerator.ZIP);
        OutputStream cos = comData.open(bOut); // open it with the final
        // destination
        PGPLiteralDataGenerator lData = new PGPLiteralDataGenerator();

        // we want to generate compressed data. This might be a user option
        // later,
        // in which case we would pass in bOut.
        OutputStream pOut = lData.open(cos, // the compressed output stream
                PGPLiteralData.BINARY, fileName, // "filename" to store
                clearData.length, // length of clear data
                new Date() // current time
                );
        pOut.write(clearData);

        lData.close();
        comData.close();

        PGPEncryptedDataGenerator cPk = new PGPEncryptedDataGenerator(
                PGPEncryptedData.CAST5, withIntegrityCheck, new SecureRandom(),
                "BC");

        cPk.addMethod(encKey);

        byte[] bytes = bOut.toByteArray();

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

        cOut.write(bytes); // obtain the actual bytes from the compressed stream

        cOut.close();

        out.close();

        return encOut.toByteArray();
    }

    private static PGPPublicKey readPublicKey(InputStream in)
            throws IOException, PGPException {
        in = PGPUtil.getDecoderStream(in);

        PGPPublicKeyRingCollection pgpPub = new PGPPublicKeyRingCollection(in);

        //
        // we just loop through the collection till we find a key suitable for
        // encryption, in the real
        // world you would probably want to be a bit smarter about this.
        //

        //
        // iterate through the key rings.
        //
        Iterator rIt = pgpPub.getKeyRings();

        while (rIt.hasNext()) {
            PGPPublicKeyRing kRing = (PGPPublicKeyRing) rIt.next();
            Iterator kIt = kRing.getPublicKeys();

            while (kIt.hasNext()) {
                PGPPublicKey k = (PGPPublicKey) kIt.next();

                if (k.isEncryptionKey()) {
                    return k;
                }
            }
        }

        throw new IllegalArgumentException(
                "Can''t find encryption key in key ring.");
    }

    public static byte[] getBytesFromFile(File file) throws IOException {
        InputStream is = new FileInputStream(file);

        // Get the size of the file
        long length = file.length();

        if (length > Integer.MAX_VALUE) {
            // File is too large
        }

        // Create the byte array to hold the data
        byte[] bytes = new byte[(int)length];

        // Read in the bytes
        int offset = 0;
        int numRead = 0;
        while (offset < bytes.length
               && (numRead=is.read(bytes, offset, bytes.length-offset)) >= 0) {
            offset += numRead;
        }

        // Ensure all the bytes have been read in
        if (offset < bytes.length) {
            throw new IOException("Could not completely read file "+file.getName());
        }

        // Close the input stream and return bytes
        is.close();
        return bytes;
    }

    public static String encryptToFile(String inputStr, String keyFile, String outFile) throws Exception {
        Security.addProvider(new BouncyCastleProvider());

        byte[] original = inputStr.getBytes();

        FileInputStream pubKey = new FileInputStream(keyFile);
        byte[] encrypted = encrypt(original, readPublicKey(pubKey), null,
                true, true);

        FileOutputStream dfis = new FileOutputStream(outFile);
        dfis.write(encrypted);
        dfis.close();

        return new String(encrypted);
    }

    public static String decryptFromFile(String passphrase, String keyFile, String inputFile) throws Exception {
        Security.addProvider(new BouncyCastleProvider());

        byte[] encFromFile = getBytesFromFile(new File(inputFile));
        FileInputStream secKey = new FileInputStream(keyFile);

        byte[] decrypted = decrypt(encFromFile, secKey, passphrase.toCharArray());

        return new String(decrypted);
    }

    public static void main(String[] args) throws Exception {
        String encrypted = encryptToFile("Hello world","pub.asc","enc.asc");
        System.out.println("/nencrypted data = ''" + new String(encrypted) + "''");

        String decrypted = decryptFromFile("open sesame", "secret.asc", "enc.asc");
        System.out.println("/ndecrypted data = ''" + decrypted + "''");

    }
}