Encrypt string in ABAP and decrypt in JavaScript

问题

I have an ABAP class which encodes a string as qr code and sends this code as email. At a later point, the code will be decoded by a SAPUI5 app based on JavaScript.

I don't want that everyone can decode the string behind that qr code with some basic barcode scanner app. That's why I'm looking for some ideas for encrypting the string in ABAP and decrypting it with JavaScript. Maybe also with a simple algorithm? It's just that the string should not give usable information to someone who decodes the qr code by himself.

Thank you for your hints and ideas!

回答1:

There is the class in ABAP cl_hard_wired_encryptor that does exactly what you want. It uses base64 encryption so will be easily decryptable in JS.

Here is the sample code:

DATA: input_string  TYPE string VALUE `This is the house that Jack built`.

TRY.
    DATA(encrypted_string) = NEW cl_hard_wired_encryptor( )->encrypt_string2string( the_string = input_string ).
  CATCH cx_encrypt_error.
ENDTRY.

IF sy-subrc EQ 0.
  cl_demo_output=>begin_section( `Initial` ).
  cl_demo_output=>write_text( input_string ).
  cl_demo_output=>begin_section( `Encrypted` ).
  cl_demo_output=>write_text( encrypted_string ).
ELSE.
  cl_demo_output=>display( 'Error while encryption' ).
ENDIF.

TRY.
    DATA(reverted_string) = NEW cl_hard_wired_encryptor( )->decrypt_string2string( the_string = encrypted_string ).
  CATCH cx_encrypt_error.
ENDTRY.

IF sy-subrc EQ 0.
  cl_demo_output=>begin_section( `Decrypted` ).
  cl_demo_output=>write_text( reverted_string ).
  cl_demo_output=>display( ).
ELSE.
  cl_demo_output=>display( 'Error while decryption' ).
ENDIF.

回答2:

ABAP has SSF_KRN_ENVELOPE function for encrypting data with RSA using certificate. You can use it, I think there is js library for decrypt it. But the data is huge because of enveloping standart.

I prefer using https://github.com/Sumu-Ning/AES library, you can encrypt with more small data as a result and not need to use certificate just keys.

来源：https://stackoverflow.com/questions/50756203/encrypt-string-in-abap-and-decrypt-in-javascript

标签

javascript

algorithm

encryption

abap