title: IV in dp:encrypt-string
body: <p>I'm able to successfully encrypt and decrypt using dp:encrypt-string and dp:decrypt-data in datapower.
  But how do I know the value of IV being used to encrypt by datapower?</p>
  
  <p>Edit- First 16 bytes of the ciphertext generated by Datapower is the IV used. But how do I force datapower to use an IV of my choice over the random IV used by datapower?</p>