Bouncy Castle J2ME 加载现有私钥

Posted 2023-02-23

【中文标题】Bouncy Castle J2ME 加载现有私钥

【英文标题】：Bouncy Castle J2ME load existing private key

【发布时间】：2013-01-13 12:15:40

【问题描述】：

我有一个 PEM 或 DER 私钥，一个现有的密钥。如何加载此密钥

PrivateKeyFactory.createKey or into an AsymmetricCipherKeyPair?

我试过了：

InputStream inKey = getClass().getResourceAsStream("/samsjava/user_key_pk8.der");
                byte[] binKey = new byte[inKey.available()];
                inKey.read(binKey, 0, binKey.length);
                inKey.close();


                privKey = PrivateKeyFactory.createKey(binKey);
                keyPair = new AsymmetricCipherKeyPair(new AsymmetricKeyParameter(false), privKey);

                rsaPriv = (RSAPrivateCrtKeyParameters)keyPair.getPrivate();
                rsaPub = (RSAPrivateCrtKeyParameters)keyPair.getPublic();

接下来我可以尝试什么？

【参考方案1】：

我在 Java 中尝试了这个东西，这应该会让我走上 J2ME 的正确轨道。代码如下：

public class EncrypDecrypt 
private RSAPrivateCrtKey rsaPriv;
private RSAPublicKey rsaPub;
private BASE64Decoder decoder;
private BASE64Encoder encoder;

public EncrypDecrypt()
    decoder = new BASE64Decoder();
    encoder = new BASE64Encoder();
    byte[] buffer;
    try 
        FileInputStream in = new FileInputStream("pathtofile.pfx");
        KeyStore kStore = KeyStore.getInstance("PKCS12");
        kStore.load(in, null);

        PrivateKey privKeyEntry = (PrivateKey)kStore.getKey("Key Alias", null); 
        rsaPriv = (RSAPrivateCrtKey) privKeyEntry;
     catch (Exception ex) 
        Logger.getLogger(EncrypDecrypt.class.getName()).log(Level.SEVERE, null, ex);
           


public String encrypt(String data)
    try
        AsymmetricBlockCipher eng = new RSAEngine();
        eng = new PKCS1Encoding(eng);
        RSAKeyParameters publicKey = new RSAKeyParameters(true, rsaPriv.getModulus(), rsaPriv.getPublicExponent());
        eng.init(true, publicKey);

        byte[] encrypted = eng.processBlock(data.getBytes(), 0, data.getBytes().length);
        return encoder.encode(encrypted);
    
    catch(Exception err)
        return "";
    


public String decrypt(String data)
    try
    
        byte[] encrypted = decoder.decodeBuffer(data);
        AsymmetricBlockCipher eng = new RSAEngine();
        eng = new PKCS1Encoding(eng);
        RSAKeyParameters privateKey = new RSAKeyParameters(true, rsaPriv.getModulus(), rsaPriv.getPrivateExponent());
        eng.init(false, privateKey);

        byte[] decrypted = eng.processBlock(encrypted, 0, encrypted.length);
        return new String(decrypted);
    
    catch(Exception err)
        return "";