存儲/檢索橢圓曲線加密（ECC）公鑰和私鑰

然後我使用公鑰對字符串進行加密並使用私鑰進行解密。

現在我通過將密鑰對寫入pem文件並存儲在外部存儲器中來存儲密鑰對。

這似乎並不安全。

那麼如何存儲和檢索這些密鑰？提前致謝。

這裏是我的代碼來生成密鑰對，並寫入到PEM文件：

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(); 
      } 
     } 
    });

來源

2017-09-25 nistelrooy41001662