javascript - jsrsasign - how to extract an x.509 certificate's fingerprint? - Stack Overflow

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Is it possible to use jsrsasign to extract the fingerprint of an x.509 certficate, similar to what can be achieved using this openssl mand:

openssl x509 -sha1 -in cert.pem -noout -fingerprint - Ref: openssl x.509 doc

I'm reading my X509 like so:

var c = new X509(); c.readCertPEM(cert); \\ how to get the fingerprint?

Ref: jsrsasign x.509 apidoc

Is it possible to use jsrsasign to extract the fingerprint of an x.509 certficate, similar to what can be achieved using this openssl mand:

openssl x509 -sha1 -in cert.pem -noout -fingerprint - Ref: openssl x.509 doc

I'm reading my X509 like so:

var c = new X509(); c.readCertPEM(cert); \\ how to get the fingerprint?

Ref: jsrsasign x.509 apidoc

• javascript
• security
• cryptography
• digital-signature
• x509

Share Improve this question Follow asked Apr 2, 2014 at 12:34 Chris SnowChris Snow 24.6k3737 gold badges156156 silver badges329329 bronze badges

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3 Answers 3

Sorted by: Reset to default 6

You just need to extract the string from between the "-----BEGIN CERTIFICATE-----" header and "-----END CERTIFICATE----- " footer, base64 decode it and pute SHA1 hash of decoded data.

Thank you for using jsrsasign. You can write like this:

hex = KEYUTIL.getHexFromPEM(certPEMstring);

fingerprint = KJUR.crypto.Util.hashHex(hex, 'sha256');

You can also find a fingerprint example here: http://kjur.github.io/jsrsasign/tool_certview.html

In the version of jsrsasign 10.7.0, You can achieve this by

import { KJUR, pemtohex } from "jsrsasign";


const hex = pemtohex("-----BEGIN CERTIFICATE----- ...... -----END CERTIFICATE----- ");
const fingerprint = KJUR.crypto.Util.hashHex(hex, "sha1")

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