Question

我正在尝试使用RSA加密数据。到目前为止一切都很好。我可以生成Private-Public密钥，我可以成功加密和解密字符串。现在我想在SharedPreference中存储公钥。我可以把它存储为字符串。我可以将其检索为字符串。我需要将其转换为Key，以传递给密码。没有发生从字符串到原始格式的转换。

这是我试过的

validates Project.find(:project_id).schedule_mode, exclusion: { in: %w(free) }

在这里，我在cipher.init（Cipher.ENCRYPT_MODE，publicKey）面临问题; publicKey包含从SahredPreferences中提取的存储的PublicKey。它是String类型！如何将其转换为Key？

PS：这只是示例代码，在现实生活中我将私钥存储在服务器中，公钥将发给用户。

Answer 1

希望这能帮到你

public void generateKeys(){
        try {
     SharedPreferences SP;
     SharedPreferences.Editor SPE;
     KeyPairGenerator generator;
                generator = KeyPairGenerator.getInstance("RSA", "BC");
                generator.initialize(256, new SecureRandom());
                KeyPair pair = generator.generateKeyPair();
                pubKey = pair.getPublic();
                privKey = pair.getPrivate();            
                byte[] publicKeyBytes = pubKey.getEncoded();
                String pubKeyStr = new String(Base64.encode(publicKeyBytes));
                byte[] privKeyBytes = privKey.getEncoded();
                String privKeyStr = new String(Base64.encode(privKeyBytes));            
                SPE = SP.edit();
                SPE.putString("PublicKey", pubKeyStr);
                SPE.putString("PrivateKey", privKeyStr);           
                SPE.commit();

  } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (NoSuchProviderException e) {
            e.printStackTrace();
        }           
    }

public PublicKey getPublicKey(){
        String pubKeyStr = SP.getString("PublicKey", "");       
        byte[] sigBytes = Base64.decode(pubKeyStr);
        X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(sigBytes);
        KeyFactory keyFact = null;
        try {
            keyFact = KeyFactory.getInstance("RSA", "BC");
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (NoSuchProviderException e) {
            e.printStackTrace();
        }
        try {
            return  keyFact.generatePublic(x509KeySpec);
        } catch (InvalidKeySpecException e) {
            e.printStackTrace();
        }
        return null;
    }
    public String getPublicKeyAsString(){
        return SP.getString("PublicKey", "");       
    }
    public PrivateKey getPrivateKey(){
        String privKeyStr = SP.getString("PrivateKey", "");
        byte[] sigBytes = Base64.decode(privKeyStr);
        X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(sigBytes);
        KeyFactory keyFact = null;
        try {
            keyFact = KeyFactory.getInstance("RSA", "BC");
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (NoSuchProviderException e) {
            e.printStackTrace();
        }
        try {
            return  keyFact.generatePrivate(x509KeySpec);
        } catch (InvalidKeySpecException e) {
            e.printStackTrace();
        }
        return null;
    }
    public String getPrivateKeyAsString(){
        return SP.getString("PrivateKey", "");      
    }

Answer 2

尝试此代码我正在使用此代码： -

private static final int MODE_PRIVATE = 0;
Editor editor;
SharedPreferences pref;

   pref = getApplicationContext().getSharedPreferences("MyPref",
            MODE_PRIVATE);
    editor = pref.edit();



   editor.putString("full_name", edtfullname.getText()
                            .toString());
   editor.commit();

  //another activity or class you can access that 

  full_name = pref.getString("full_name", "");

在sharedPreferences中存储公钥，并检索它

2 个答案: