之前一已经写好了，在服务器上面运行有半年了，突然日志报错，说解密失败，秘钥公钥等等都没有动过。

下面是解密的代码：秘钥文件是可以读取出来的，就是在doFinal的时候报错了。

public static void boot() throws IOException, KeyException, NoSuchPaddingException, NoSuchAlgorithmException, NoSuchProviderException {

    Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
    rsa = Cipher.getInstance("RSA/ECB/PKCS1Padding", "BC");
    String key = getKeyString();
    Reader privateKeyReader = new StringReader(key);
    PEMParser privatePemParser = new PEMParser(privateKeyReader);
    Object privateObject = privatePemParser.readObject();
    PrivateKey privateKey;
    if (privateObject instanceof PEMKeyPair pemKeyPair) {
        JcaPEMKeyConverter converter = new JcaPEMKeyConverter().setProvider("BC");
        privateKey = converter.getPrivateKey(pemKeyPair.getPrivateKeyInfo());
    } else {
        throw new KeyException("rsa秘钥错误");
    }

    // 初始化解密类
    rsa.init(Cipher.DECRYPT_MODE, privateKey);
}

private static String getKeyString() throws IOException {
    final FileInputStream inputStream = new FileInputStream(Config.get("private_key_file"));
    final byte[] bytes = inputStream.readAllBytes();
    final String s = new String(bytes);
    inputStream.close();
    return s;
}

public static String decryptRSA(String encryptRandomKey) throws IllegalBlockSizeException, BadPaddingException {
    byte[] decodeKey = Base64.getDecoder().decode(encryptRandomKey);
    byte[] utf8 = Decipherer.rsa.doFinal(decodeKey);

    return new String(utf8, StandardCharsets.UTF_8);
}

下面是异常信息：

org.bouncycastle.jcajce.provider.util.BadBlockException: unable to decrypt block
    at org.bouncycastle.jcajce.provider.asymmetric.rsa.CipherSpi.getOutput(Unknown Source) ~[bcprov-jdk15on-1.64.jar:1.64.0]
    at org.bouncycastle.jcajce.provider.asymmetric.rsa.CipherSpi.engineDoFinal(Unknown Source) ~[bcprov-jdk15on-1.64.jar:1.64.0]
    at javax.crypto.Cipher.doFinal(Cipher.java:2205) ~[?:?]
    at com.pjcy.pullwechatmsg.Decipherer.decryptRSA(Decipherer.java:56) ~[getwechatmsg.jar:?]
    at com.pjcy.pullwechatmsg.Decipherer.decrypt(Decipherer.java:63) ~[getwechatmsg.jar:?]
    at com.pjcy.pullwechatmsg.ChatSet.decrypt(ChatSet.java:48) ~[getwechatmsg.jar:?]
    at com.pjcy.pullwechatmsg.Dispatcher.store(Dispatcher.java:57) ~[getwechatmsg.jar:?]
    at com.pjcy.pullwechatmsg.Dispatcher.start(Dispatcher.java:41) ~[getwechatmsg.jar:?]
    at com.pjcy.pullwechatmsg.ServiceLaunch.lambda$init$0(ServiceLaunch.java:28) ~[getwechatmsg.jar:?]
    at java.lang.Thread.run(Thread.java:833) ~[?:?]
Caused by: org.bouncycastle.crypto.InvalidCipherTextException: block incorrect
    at org.bouncycastle.crypto.encodings.PKCS1Encoding.decodeBlock(Unknown Source) ~[bcprov-jdk15on-1.64.jar:1.64.0]
    at org.bouncycastle.crypto.encodings.PKCS1Encoding.processBlock(Unknown Source) ~[bcprov-jdk15on-1.64.jar:1.64.0]
    ... 10 more