java实现pgp加密解密

PGP（Pretty Good Privacy）是一种加密和签名数据的标准协议，Java可以通过Bouncy Castle库实现PGP加密解密，具体步骤如下：

1. 首先需要导入Bouncy Castle库，可以在pom.xml文件中添加以下依赖：

<dependency>
    <groupId>org.bouncycastle</groupId>
    <artifactId>bcpg-jdk15on</artifactId>
    <version>1.68</version>
</dependency>
<dependency>
    <groupId>org.bouncycastle</groupId>
    <artifactId>bcpkix-jdk15on</artifactId>
    <version>1.68</version>
</dependency>

2. 生成PGP密钥对（公钥和私钥）。

3. 使用公钥加密明文数据。

PGPPublicKey publicKey = ... // 获取公钥
byte[] plainText = ... // 明文数据
ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
PGPEncryptedDataGenerator encryptedDataGenerator = new PGPEncryptedDataGenerator(new JcePGPDataEncryptorBuilder(PGPEncryptedData.CAST5).setWithIntegrityPacket(true).setSecureRandom(new SecureRandom()).setProvider("BC"));
encryptedDataGenerator.addMethod(new JcePublicKeyKeyEncryptionMethodGenerator(publicKey).setProvider("BC"));
OutputStream encryptedOutputStream = encryptedDataGenerator.open(outputStream, new byte[1024]);
encryptedOutputStream.write(plainText);
encryptedOutputStream.close();
byte[] encryptedData = outputStream.toByteArray();

4. 使用私钥解密加密后的数据。

PGPSecretKey secretKey = ... // 获取私钥
char[] passPhrase = ... // 私钥的口令
InputStream inputStream = new ByteArrayInputStream(encryptedData);
PGPObjectFactory objectFactory = new JcaPGPObjectFactory(inputStream);
PGPEncryptedDataList encryptedDataList = (PGPEncryptedDataList) objectFactory.nextObject();
Iterator<PGPPublicKeyEncryptedData> it = encryptedDataList.getEncryptedDataObjects();
PGPPublicKeyEncryptedData encryptedData = it.next();
InputStream decryptedInputStream = encryptedData.getDataStream(new JcePublicKeyDataDecryptorFactoryBuilder().setProvider("BC").build(secretKey.extractPrivateKey(new JcePBESecretKeyDecryptorBuilder().setProvider("BC").build(passPhrase))));
byte[] decryptedData = IOUtils.toByteArray(decryptedInputStream);