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From: Malcolm Matalka <>
To: caml users <>
Subject: Re: [Caml-list] Implementing JWT RS256 verification
Date: Tue, 19 Feb 2019 10:53:16 +0100
Message-ID: <> (raw)
In-Reply-To: <>

Whoops, after looking around I see it's in master.  I got confused in
the GitHub UI.

Malcolm Matalka <> writes:

> Looking at the source code to Nocrypto, it looks like there is a verify
> function but it is not exposed in the .mli for 0.5.4, anyone aware of
> why this is the case?  Just an oversight?
> Malcolm Matalka <> writes:
>> Hello,
>> I'm trying to implement verification of JWT's signed with RS256 and
>> having some trouble finding the crypto library I should use for this.
>> Nocrypt and CryptoKit are the obvious choices by searching opam, however
>> neither of them seem to quite have what I'm looking for.  RS256 is RSA
>> with SHA256 and something called PKCS1v1.5 for padding.  I see both of
>> these libraries have RSA options but it doesn't seem possible to specify
>> the hashing algorithm.  Nocrypto has a PKCS1v1.5 module in the RSA
>> module but no hash.  When I call [sig_decode] on my message I get back
>> a message text but it also doesn't seem to match what I'm expecting.
>> My input is the message, the signed signature, and the public key, and
>> I'd like to know verify these match correctly.
>> I really don't know much about crypto and am just trying to implement a
>> spec.  Anyone have a suggestion for what library I should use?  Am I
>> just missing something?
>> Thanks,
>> /Malcolm

      reply index

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-02-19  5:37 Malcolm Matalka
     [not found] ` <>
2019-02-19  6:31   ` Malcolm Matalka
2019-02-19  9:41 ` Malcolm Matalka
2019-02-19  9:53   ` Malcolm Matalka [this message]

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