How can we use asymmetric encryption in a flow designer action to encrypt a secret in a rest payload

[Seb_IFC]

Hi, I need to pass a secret to another API (outside of service now) within a payload. 

The secret is entered as a service catalog item field and becomes an input to my flow designer workflow. 

In my action, I am trying to use a public key to encrypt the secret string and then pass it along in base64 to my target system using a rest call. 

The intent is to then decrypt that value on the destination using the private key. 

I have tried to find ways of making this feasable, i've tried to use script includes with JSEncrypt and CryptoJS, to no avail. 

I even tried to use the glydeencrypter for symmetrical encryption but every base64 string created on SNOW with that method, I can't decrypt using openssl, all ciphers were tried and encrypting a value with SNOW does not generate the same encryption although using the same key. 

```

  var public_key = '010101111000110011001110';
  var encr = new GlideEncrypter(public_key); 
  var clearString = 'abcdefg'; 
  var encrString = encr.encrypt(clearString); 

```
generates : +vkYSkAmH9A=

but running : 

```

echo -n 'abcdefg' | openssl enc -des-ede-ecb -e -k 010101111000110011001110 --nosalt -a

```

generates : +0bFf69+f0I=

I have been refering to this article :

https://support.servicenow.com/kb?id=kb_article_view&sysparm_article=KB0747622 

I can't believe I would be the only person with such a requirement 

Can anyone help point me in the right direction? 

thanks!