HI @Steve Linn ,

I am doing encryption decryption using gateway script but getting below error while executing attached js file. Can you please help me in resolving this

20230531T055510.228Z [0x85800020][crypto][error] apigw(apiconnect): tid(18321)[request][172.18.0.1] gtid(811f13326476e13e00004791): Incorrect number of arguments provided to function 'update()'. Expected number of arguments: 1; actual number of arguments: 3
20230531T055510.228Z [0x85800007][gatewayscript][error] apigw(apiconnect): tid(18321)[request][172.18.0.1] gtid(811f13326476e13e00004791): GatewayScript processing Error 'SyntaxError: Incorrect number of arguments provided to function 'update()'. Expected number of arguments: 1; actual number of arguments: 3
In file 'gatewayscript:///modules/_dputil.js' line:21, stack:SyntaxError: Incorrect number of arguments provided to function 'update()'. Expected number of arguments: 1; actual number of arguments: 3
    at Object._checkNumberOfArguments [as checkLength] (gatewayscript:///modules/_dputil.js:21:15)
    at drJSDecipher.Decipher.update (gatewayscript:///modules/crypto.js:626:15)
    at decrypt (local:///js/localtest_sandbox_encryptiondecryption_1.0.0_gatewayscript_6.js:17:11)
    at Object.<anonymous> (local:///js/localtest_sandbox_encryptiondecryption_1.0.0_gatewayscript_6.js:30:23)
    at Script.execute (gatewayscript:///datapower.js:155:24)
    at Object.<anonymous> (gatewayscript:///datapower.js:582:55)'

Attachment(s)

js.txt   1 KB 1 version

couple of small errors in your script
- you didn't define the output of the encryption, hence it would be a buffer
- you did add an extra parameter in the decipher update (that's the error it's complaining about above)
- you didn't define the decipher final 

The following script is the working version

const crypto = require('crypto');

// Encryption
function encrypt(plainText, encryptionKey, iv) {
  const cipher = crypto.createCipheriv('aes128-cbc', encryptionKey, iv);
  let encrypted = cipher.update(plainText);
  return cipher.final('hex');;
}

// Decryption
function decrypt(encryptedText, encryptionKey, iv) {
    console.error('Insidie Decrypt:', encryptedText );
    console.error('Insidie Decrypt iv:', iv );

  var decipher = crypto.createDecipheriv('aes128-cbc', encryptionKey, iv);
 decipher.update(encryptedText,'hex');
 var originalPlainText = decipher.final('utf8');
  return originalPlainText;
}

// Example usage
const encryptionKey = Buffer.from('0123456789abcdef0123456789abcdef','hex');
const iv = Buffer.from(crypto.randomBytes(16),'hex');
const plainText = 'This is a test message';

const encryptedText = encrypt(plainText, encryptionKey, iv);
console.error('Encrypted text:', encryptedText);

const decryptedText = decrypt(encryptedText, encryptionKey, iv);
console.error('Decrypted text:', decryptedText);

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Tom van Oppens
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