java – 存储/检索椭圆曲线加密(ECC)公钥和私钥

我必须编写代码来生成ECC密钥对.

然后我使用公钥加密字符串并使用私钥进行解密.

现在我通过将密钥对写入pem文件并存储在外部存储器中来存储密钥对.

这似乎不安全.

那么如何存储和检索这些密钥呢？
预先感谢.

这是我生成密钥对并写入pem文件的代码：

btnGenKey.setonClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            ECNamedCurveParameterSpec spec = ECNamedCurveTable.getParameterSpec("prime256v1");
            try {
                KeyPairGenerator g = KeyPairGenerator.getInstance("ECDSA","SC");
                g.initialize(spec, new SecureRandom());
                KeyPair keyPair = g.generateKeyPair();
                privateKey = keyPair.getPrivate();
                publicKey = keyPair.getPublic();
                Toast.makeText(MainActivity.this, "GEN KEY SUCCESS!!", Toast.LENGTH_SHORT).show();
                String state;
                state = Environment.getExternalStorageState();
                if(Environment.MEDIA_MOUNTED.equals(state))
                {
                    File root = Environment.getExternalStorageDirectory();
                    File dir = new File(root.getAbsolutePath()+"/EDCSA1");
                    if(!dir.exists())
                    {
                        dir.mkdir();
                    }
                    File pub = new File(dir,"pub.pem");
                    File prv = new File(dir,"pri.pem");
                    try
                    {
                        FileOutputStream fileOutputStream = new FileOutputStream(pub);
                        StringWriter writer = new StringWriter();
                        PemWriter pemWriter = new PemWriter(writer);
                        pemWriter.writeObject(new PemObject("PUBLIC KEY",publicKey.getEncoded()));
                        pemWriter.flush();
                        pemWriter.close();
                        String publickeyPem = writer.toString();
                        fileOutputStream.write(publickeyPem.getBytes());
                        fileOutputStream.close();
                        Toast.makeText(MainActivity.this, "SAVE PUBLICKEY", Toast.LENGTH_SHORT).show();
                        ///
                        FileOutputStream fileOutputStream2 = new FileOutputStream(prv);
                        StringWriter writer2 = new StringWriter();
                        PemWriter pemWriter2 = new PemWriter(writer2);
                        pemWriter2.writeObject(new PemObject("PRIVATE KEY",privateKey.getEncoded()));
                        pemWriter2.flush();
                        pemWriter2.close();
                        String privatekeyPem = writer2.toString();
                        fileOutputStream2.write(privatekeyPem.getBytes());
                        fileOutputStream2.close();
                        Toast.makeText(MainActivity.this, "SAVE PRIVATE", Toast.LENGTH_SHORT).show();
                    }
                    catch (Exception ex)
                    {
                        ex.printstacktrace();
                    }
                }

            } catch (Exception e) {
                e.printstacktrace();
            }
        }
    });

解决方法:

我不建议使用pem文件.在android中存储您的秘密信息的最佳方式是在密钥库中,因为它非常安全.阅读更多关于keystore here的信息.

如果您正在寻找要应用的密码转换,请参阅this,因为它包含您可以使用的算法和密码转换列表.

以下是关于如何使用所有这些的一般概念.

1)初始化密钥库,生成密钥对(公钥和私钥)
2)加密你的字符串并将其存储在存储中(共享首选项,数据库等)
3)从存储中获取加密字符串并解密以供您使用.

UPDATE :Examples

如果您想要完整的工作,请参考这些示例
1)https://developer.android.com/training/articles/keystore.html
2)http://www.androidauthority.com/use-android-keystore-store-passwords-sensitive-information-623779/