Generate RSA-SHA1 signature based off of a string and private key

SanjivMeher · ‎07-01-2019

I am working on a JIRA integration from Servicenow and the authentication I want to use is oAuth 1.0. As servicenow doesnt support oAuth 1.0, I am writing custom code to make it work.

I have the access token, consumer id etc, and I am trying to generate a signature, with a private key and a string I have.

Is there a function which can generate the signature using RSA-SHA1 algorithm?

I know I can generate the HMAC SHA1, but RSA-SHA1 is not supported

var mac = new CertificateEncryption();
var signature = mac.generateMac(pkey, "RSA-SHA1", signatureBaseString);

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SanjivMeher · ‎07-15-2019

Yes. I had a certificate which was in pkcs8 format. I converted it to pkcs12 format and loaded it in sys_certificate table. Once you do that, use below function, which will generate the signature.

var ce = new CertificateEncryption();
ce.sign("sysid of the certificate", "1", "", "SHA1withRSA", "datastring");

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Sashi K1 · ‎11-02-2020

Quick question. Your instructions says copy content from 'jirapublickey.pem' exactly below jirapriatekey_copy.pem file.

the example show, as

-----BEGIN CERTIFICATE-----

-----END CERTIFICATE-----

is that jirapublickey.cer file or jirapublickey.pem file? .pem will have

-----BEGIN PUBLIC KEY-----

-----END PUBLIC KEY-----

is that a .cert or .pem should we use for PUBLIC KEY?

SanjivMeher · ‎11-02-2020

It should be the .pem file in the public key.

But I dont exactly remember, because I have done this long time back.

Try with .pem and if that doesnt work, you will have to try with .cert

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Saif7 · ‎03-02-2022

Hello Sanjov!

Thanks for sharnig this information with us,

I have a question here, your post meaning that we can use OAuth 1 in ServiceNow! Please confirm because thats very important to me!

Best Regards.