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Author's profile photo shankul saxena

To Encrypt and Decrypt a Single Field in Message Mapping

Requirement:- We had a requirement where we have to encrypt a single field in message mapping using a key and cipher. The key is 128 bit key which willb be hard coded and same key we have used to decrypt the encrypted text.

Solution:- As a solution for this problem, we have written a java code using Base64 algorithm.

Libraries that we have included were:-

Libraries.PNG

Base64Encoder and Base64decoder classes are used to encode and decode the field.

Code for Encryption:-

public String Encryption(String CreditCard_No, Container container) throws StreamTransformationException{

String key = “############”; // 128 bit key

BASE64Encoder encoder = new BASE64Encoder();

String encoded=””;

      try {

         // Create key and cipher

         Key aesKey = new SecretKeySpec(key.getBytes(), “AES”);

         Cipher cipher = Cipher.getInstance(“AES”);

         // encrypt the CreditCard_No

         cipher.init(Cipher.ENCRYPT_MODE, aesKey);

         byte[] encrypted = cipher.doFinal(CreditCard_No.getBytes());

      

       encoded= encoder.encode(encrypted);

          /return encrypted text

     

  return encoded;

     

      }

  catch(Exception e) {

          e.printStackTrace();

  return “error during encryption”+e.toString();

    }

}

Code for Decryption:-

String Encryption(String encryptedValue, Container container) throws StreamTransformationException{

String key = “############”; // any 128 bit key can be given

BASE64Decoder decoder = new BASE64Decoder();

      try {

         // Create key and cipher

         Key aesKey = new SecretKeySpec(key.getBytes(), “AES”);

         Cipher cipher = Cipher.getInstance(“AES”);

         // decrypt the text

         cipher.init(Cipher.DECRYPT_MODE, aesKey);

         byte[] encryptedbyte= decoder.decodeBuffer(encryptedValue);

         byte[] decryptedValue=cipher.doFinal(encryptedbyte);

  //Converting the input Strings to bytes so that it can be decrypted

         String decrypted = new String(decryptedValue,”UTF-8″);

  return decrypted;

      }

catch(Exception e) {

         e.printStackTrace();

  return “error during decryption” + e.toString();

      }

}

Mapping output:-

Encryption-

encrypt.PNG

Decryption:-

Decrypt.PNG

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      2 Comments
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      Author's profile photo Eng Swee Yeoh
      Eng Swee Yeoh

      Hi Shankul

      Thanks for sharing. Just to add on, use of sun.* packages are discouraged as they are meant for internal use and may change without warning.

      Refer to the discussion in the following thread on other alternatives of Base64 libraries.

      Re: Base64 Encoding using UDF

      Rgds

      Eng Swee

      Author's profile photo shankul saxena
      shankul saxena
      Blog Post Author

      Thanks Eng for this information. We are working on PI 7.11 and getting package doesn't exist error. Soon we are upgrading to PO 7.5 and I hope DatatypeConverter will be available there.