Java Bouncy castle 密码学：用同一程序加密时解密文件为空
Java Bouncy castle cryptography : decrypted file is empty when encrypted by the same program
我用这个程序用我们的 public 密钥 （在 .asc 中） 加密了一个文件，然后用我们的私钥环 解密了这个加密文件 (.skr).
加密部分正在创建一个文件，但是在解密同一个文件时，解密后的文件是空的。 我可以了解一下为什么它是空的。
仅供参考：对于未被该程序加密的其他文件，此解密部分与相同的 .skr 一起工作正常。
测试快到 main 方法中程序的结尾了。
package com.something.digtal.web.generic.utils;
import org.bouncycastle.bcpg.ArmoredOutputStream;
import org.bouncycastle.bcpg.CompressionAlgorithmTags;
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.PGPObjectFactory;
import org.bouncycastle.openpgp.PGPOnePassSignatureList;
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;
import java.io.*;
import java.security.NoSuchProviderException;
import java.security.SecureRandom;
import java.security.Security;
import java.util.Iterator;
//Matthew McCullough: Rediculous as it sounds, many of the functions such as
// private static void encryptFile()
// private static void decryptFile()
// private static PGPPrivateKey findSecretKey()
// private static PGPPublicKey readPublicKey()
// for PGP in BouncyCastle are private, thus making it unbearable to use
// in a simple manner against whole file contents. Thus, this class is duplicated from the
// core of BouncyCastle (KeyBasedFileProcessor being the original name), but with the
// methods made public so that the test can use them.
/**
* A simple utility class that encrypts/decrypts public key based
* encryption files.
* <p>
* To encrypt a file: KeyBasedFileProcessor -e [-a|-ai] fileName publicKeyFile.<br>
* If -a is specified the output file will be "ascii-armored".
* If -i is specified the output file will be have integrity checking added.
* <p>
* To decrypt: KeyBasedFileProcessor -d fileName secretKeyFile passPhrase.
* <p>
* Note 1: this example will silently overwrite files, nor does it pay any attention to
* the specification of "_CONSOLE" in the filename. It also expects that a single pass phrase
* will have been used.
* <p>
* Note 2: if an empty file name has been specified in the literal data object contained in the
* encrypted packet a file with the name filename.out will be generated in the current working directory.
*/
public class EncryptedFileProcessorUtil
{
/**
* A simple routine that opens a key ring file and loads the first available key suitable for
* encryption.
*
* @param in
* @return
* @throws IOException
* @throws PGPException
*/
public 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.");
}
/**
* Search a secret key ring collection for a secret key corresponding to
* keyID if it exists.
*
* @param pgpSec a secret key ring collection.
* @param keyID keyID we want.
* @param pass passphrase to decrypt secret key with.
* @return
* @throws PGPException
* @throws NoSuchProviderException
*/
public 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
*/
public static void decryptFile(
InputStream in,
InputStream keyIn,
char[] passwd,
String defaultFileName,
String outputPath)
throws Exception
{
in = PGPUtil.getDecoderStream(in);
PGPObjectFactory pgpF = new PGPObjectFactory(in);
PGPEncryptedDataList enc;
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(), passwd);
}
if (sKey == null)
{
throw new IllegalArgumentException("secret key for message not found.");
}
InputStream clear = pbe.getDataStream(sKey, "BC");
PGPObjectFactory plainFact = new PGPObjectFactory(clear);
Object message = plainFact.nextObject();
if (message instanceof PGPCompressedData)
{
PGPCompressedData cData = (PGPCompressedData)message;
PGPObjectFactory pgpFact = new PGPObjectFactory(cData.getDataStream());
message = pgpFact.nextObject();
}
if (message instanceof PGPLiteralData)
{
PGPLiteralData ld = (PGPLiteralData)message;
String outFileName = ld.getFileName();
if (ld.getFileName().length() == 0)
{
outFileName = defaultFileName;
}
//MJM: Enhancement to allow targeting of output folder for decrypted files
if (outputPath != null || outputPath.length() > 0) {
outFileName = outputPath + outFileName;
}
BufferedOutputStream fOut = new BufferedOutputStream( new FileOutputStream(outFileName));
BufferedInputStream unc = new BufferedInputStream(ld.getInputStream());
int ch;
byte[] buffer = new byte[ 1024 * 1024 ];
int len;
while ( ( len = unc.read( buffer ) ) != -1 )
{
// Writing data and potentially sending off a part
fOut.write( buffer, 0, len );
}
/*
while ((ch = unc.read()) >= 0)
{
fOut.write(ch);
} */
}
else if (message instanceof PGPOnePassSignatureList)
{
throw new PGPException("encrypted message contains a signed message - not literal data.");
}
else
{
throw new PGPException("message is not a simple encrypted file - type unknown.");
}
if (pbe.isIntegrityProtected())
{
if (!pbe.verify())
{
System.err.println("message failed integrity check");
}
else
{
System.err.println("message integrity check passed");
}
}
else
{
System.err.println("no message integrity check");
}
}
public static void encryptFile(
OutputStream out,
String fileName,
PGPPublicKey encKey,
boolean armor,
boolean withIntegrityCheck)
throws IOException, NoSuchProviderException
{
if (armor)
{
out = new ArmoredOutputStream(out);
}
try
{
ByteArrayOutputStream bOut = new ByteArrayOutputStream();
PGPCompressedDataGenerator comData = new PGPCompressedDataGenerator(
PGPCompressedData.ZIP);
PGPUtil.writeFileToLiteralData(comData.open(bOut), PGPLiteralData.BINARY, new File(fileName));
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);
cOut.close();
out.close();
}
catch (PGPException e)
{
System.err.println(e);
if (e.getUnderlyingException() != null)
{
e.getUnderlyingException().printStackTrace();
}
}
}
public static void main(
String[] args)
throws Exception
{
//Encrypt
OutputStream out = new FileOutputStream("C:\temp\delete\PGP_Test\encryption_output.pgp");
String fileName = "C:\temp\delete\PGP_Test\encryption_input.txt";
PGPPublicKey encKey = readPublicKey(new FileInputStream("C:\temp\delete\PGP_Test\Online-eng-request_public.asc"));
encryptFile(out, fileName, encKey, false, false);
//Now decrypt
String PASSPHRASE = "tata wants to chase a squirrel";
String DE_INPUT = "C:\temp\delete\PGP_Test\encryption_output.pgp";
String DE_OUTPUTPATH = "C:\temp\delete\PGP_Test\archive\";
String DE_OUTPUTFILE = "something_17APR2016.txt";
String DE_KEY_FILE = "C:\temp\delete\PGP_Test\secring.skr";
FileInputStream in = new FileInputStream(DE_INPUT);
FileInputStream keyIn = new FileInputStream(DE_KEY_FILE);
decryptFile(in, keyIn, PASSPHRASE.toCharArray(), new File(DE_OUTPUTFILE).getName(), DE_OUTPUTPATH);
}
}
只是一个简单的猜测。您的消息比输出流的缓冲区小，并且没有被刷新...?
您没有关闭 fOut。冲洗它是不够的，因为你仍然有资源泄漏。
这可能是由于外部 Buffer/FileWritter class 在您调用 PGP 函数时被使用但未被关闭的原因。尝试在外部方法中关闭 writer classes 并再次检查。可能有助于解决您的问题。
我用这个程序用我们的 public 密钥 （在 .asc 中） 加密了一个文件，然后用我们的私钥环 解密了这个加密文件 (.skr).
加密部分正在创建一个文件，但是在解密同一个文件时，解密后的文件是空的。 我可以了解一下为什么它是空的。
仅供参考：对于未被该程序加密的其他文件，此解密部分与相同的 .skr 一起工作正常。
测试快到 main 方法中程序的结尾了。
package com.something.digtal.web.generic.utils;
import org.bouncycastle.bcpg.ArmoredOutputStream;
import org.bouncycastle.bcpg.CompressionAlgorithmTags;
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.PGPObjectFactory;
import org.bouncycastle.openpgp.PGPOnePassSignatureList;
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;
import java.io.*;
import java.security.NoSuchProviderException;
import java.security.SecureRandom;
import java.security.Security;
import java.util.Iterator;
//Matthew McCullough: Rediculous as it sounds, many of the functions such as
// private static void encryptFile()
// private static void decryptFile()
// private static PGPPrivateKey findSecretKey()
// private static PGPPublicKey readPublicKey()
// for PGP in BouncyCastle are private, thus making it unbearable to use
// in a simple manner against whole file contents. Thus, this class is duplicated from the
// core of BouncyCastle (KeyBasedFileProcessor being the original name), but with the
// methods made public so that the test can use them.
/**
* A simple utility class that encrypts/decrypts public key based
* encryption files.
* <p>
* To encrypt a file: KeyBasedFileProcessor -e [-a|-ai] fileName publicKeyFile.<br>
* If -a is specified the output file will be "ascii-armored".
* If -i is specified the output file will be have integrity checking added.
* <p>
* To decrypt: KeyBasedFileProcessor -d fileName secretKeyFile passPhrase.
* <p>
* Note 1: this example will silently overwrite files, nor does it pay any attention to
* the specification of "_CONSOLE" in the filename. It also expects that a single pass phrase
* will have been used.
* <p>
* Note 2: if an empty file name has been specified in the literal data object contained in the
* encrypted packet a file with the name filename.out will be generated in the current working directory.
*/
public class EncryptedFileProcessorUtil
{
/**
* A simple routine that opens a key ring file and loads the first available key suitable for
* encryption.
*
* @param in
* @return
* @throws IOException
* @throws PGPException
*/
public 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.");
}
/**
* Search a secret key ring collection for a secret key corresponding to
* keyID if it exists.
*
* @param pgpSec a secret key ring collection.
* @param keyID keyID we want.
* @param pass passphrase to decrypt secret key with.
* @return
* @throws PGPException
* @throws NoSuchProviderException
*/
public 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
*/
public static void decryptFile(
InputStream in,
InputStream keyIn,
char[] passwd,
String defaultFileName,
String outputPath)
throws Exception
{
in = PGPUtil.getDecoderStream(in);
PGPObjectFactory pgpF = new PGPObjectFactory(in);
PGPEncryptedDataList enc;
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(), passwd);
}
if (sKey == null)
{
throw new IllegalArgumentException("secret key for message not found.");
}
InputStream clear = pbe.getDataStream(sKey, "BC");
PGPObjectFactory plainFact = new PGPObjectFactory(clear);
Object message = plainFact.nextObject();
if (message instanceof PGPCompressedData)
{
PGPCompressedData cData = (PGPCompressedData)message;
PGPObjectFactory pgpFact = new PGPObjectFactory(cData.getDataStream());
message = pgpFact.nextObject();
}
if (message instanceof PGPLiteralData)
{
PGPLiteralData ld = (PGPLiteralData)message;
String outFileName = ld.getFileName();
if (ld.getFileName().length() == 0)
{
outFileName = defaultFileName;
}
//MJM: Enhancement to allow targeting of output folder for decrypted files
if (outputPath != null || outputPath.length() > 0) {
outFileName = outputPath + outFileName;
}
BufferedOutputStream fOut = new BufferedOutputStream( new FileOutputStream(outFileName));
BufferedInputStream unc = new BufferedInputStream(ld.getInputStream());
int ch;
byte[] buffer = new byte[ 1024 * 1024 ];
int len;
while ( ( len = unc.read( buffer ) ) != -1 )
{
// Writing data and potentially sending off a part
fOut.write( buffer, 0, len );
}
/*
while ((ch = unc.read()) >= 0)
{
fOut.write(ch);
} */
}
else if (message instanceof PGPOnePassSignatureList)
{
throw new PGPException("encrypted message contains a signed message - not literal data.");
}
else
{
throw new PGPException("message is not a simple encrypted file - type unknown.");
}
if (pbe.isIntegrityProtected())
{
if (!pbe.verify())
{
System.err.println("message failed integrity check");
}
else
{
System.err.println("message integrity check passed");
}
}
else
{
System.err.println("no message integrity check");
}
}
public static void encryptFile(
OutputStream out,
String fileName,
PGPPublicKey encKey,
boolean armor,
boolean withIntegrityCheck)
throws IOException, NoSuchProviderException
{
if (armor)
{
out = new ArmoredOutputStream(out);
}
try
{
ByteArrayOutputStream bOut = new ByteArrayOutputStream();
PGPCompressedDataGenerator comData = new PGPCompressedDataGenerator(
PGPCompressedData.ZIP);
PGPUtil.writeFileToLiteralData(comData.open(bOut), PGPLiteralData.BINARY, new File(fileName));
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);
cOut.close();
out.close();
}
catch (PGPException e)
{
System.err.println(e);
if (e.getUnderlyingException() != null)
{
e.getUnderlyingException().printStackTrace();
}
}
}
public static void main(
String[] args)
throws Exception
{
//Encrypt
OutputStream out = new FileOutputStream("C:\temp\delete\PGP_Test\encryption_output.pgp");
String fileName = "C:\temp\delete\PGP_Test\encryption_input.txt";
PGPPublicKey encKey = readPublicKey(new FileInputStream("C:\temp\delete\PGP_Test\Online-eng-request_public.asc"));
encryptFile(out, fileName, encKey, false, false);
//Now decrypt
String PASSPHRASE = "tata wants to chase a squirrel";
String DE_INPUT = "C:\temp\delete\PGP_Test\encryption_output.pgp";
String DE_OUTPUTPATH = "C:\temp\delete\PGP_Test\archive\";
String DE_OUTPUTFILE = "something_17APR2016.txt";
String DE_KEY_FILE = "C:\temp\delete\PGP_Test\secring.skr";
FileInputStream in = new FileInputStream(DE_INPUT);
FileInputStream keyIn = new FileInputStream(DE_KEY_FILE);
decryptFile(in, keyIn, PASSPHRASE.toCharArray(), new File(DE_OUTPUTFILE).getName(), DE_OUTPUTPATH);
}
}
只是一个简单的猜测。您的消息比输出流的缓冲区小，并且没有被刷新...?
您没有关闭 fOut。冲洗它是不够的，因为你仍然有资源泄漏。
这可能是由于外部 Buffer/FileWritter class 在您调用 PGP 函数时被使用但未被关闭的原因。尝试在外部方法中关闭 writer classes 并再次检查。可能有助于解决您的问题。