Sha256 - how to do this javascript in ABAP. Is it possible?

Question

Hello,
I would like to use the amazon product advertising api. For this my requests need to be "signed". In an example I found the following javaScript for signing requests:
     function sign(secret, message) {
       var messageBytes = str2binb(message);
       var secretBytes = str2binb(secret);
       if (secretBytes.length > 16) {
           secretBytes = core_sha256(secretBytes, secret.length * chrsz);
       var ipad = Array(16), opad = Array(16);
       for (var i = 0; i < 16; i++) {
           ipad<i> = secretBytes<i> ^ 0x36363636;
           opad<i> = secretBytes<i> ^ 0x5C5C5C5C;
       var imsg = ipad.concat(messageBytes);
       var ihash = core_sha256(imsg, 512 + message.length * chrsz);
       var omsg = opad.concat(ihash);
       var ohash = core_sha256(omsg, 512 + 256);
       var b64hash = binb2b64(ohash);
       var urlhash = encodeURIComponent(b64hash);
       return urlhash;
Could someone please tell me if this is also possible with ABAP and if yes, how?
Thanks a lot in advance. Unfortunatley I don't get it done by myself.
bye, Vanessa

Answer 1

Hi
You can code JavaScript directly in your ABAP code.
data: l_JS_PROCESSOR type ref to CL_JAVA_SCRIPT,
      l_RETURN_VALUE type STRING,
      l_SOURCE       type STRING.
Create a new javaScript
l_JS_PROCESSOR = CL_JAVA_SCRIPT=>CREATE( ).
Your Javascript code
concatenate
   'var l_source = "Hello,"; '
   'l_source += " World"; '
    into l_SOURCE separated by CL_ABAP_CHAR_UTILITIES=>CR_LF.
compile the code
l_JS_PROCESSOR->COMPILE( SCRIPT_NAME = 'MYSCRIPT.JS' SCRIPT = L_SOURCE ).
syntax errors ?
if l_JS_PROCESSOR->LAST_CONDITION_CODE <> 0.
   write: / 'Error', l_JS_PROCESSOR->LAST_ERROR_MESSAGE.
   exit.
else.
   write / 'compiled'.
endif.
execute
l_JS_PROCESSOR->EXECUTE( SCRIPT_NAME = 'MYSCRIPT.JS' ).
Errors ?
if l_JS_PROCESSOR->LAST_CONDITION_CODE <> 0.
   write: / 'Error in execution',l_JS_PROCESSOR->LAST_ERROR_MESSAGE.
   exit.
else.
   write / 'Script was executed'.
endif.
return the output variable
l_RETURN_VALUE = l_JS_PROCESSOR->EVALUATE( JAVA_SCRIPT = 'l_source;' ).
write : / l_RETURN_VALUE.