Re: [Dcrup] DKIM-Signing hashes with Ed25519
Jeremy Harris <jgh@wizmail.org> Wed, 14 November 2018 23:28 UTC
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From: Jeremy Harris <jgh@wizmail.org>
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Date: Wed, 14 Nov 2018 23:28:43 +0000
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Subject: Re: [Dcrup] DKIM-Signing hashes with Ed25519
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On 14/11/2018 21:44, Дилян Палаузов wrote: > I asked at https://gitlab.com/gnutls/gnutls/issues/613 to enhance > GnuTLs to sign per RFC 8463. The answer is, that there is a pure > EdDSA, which can sign data. A pre-hashed-EdDSA version, which can sign > hashes, is not standardized. It certainly confused me when I was implementing it for Exim. Despite being called "pure" it does a hash on the data, and signs the hash. You can't sign raw data, and you can't sign a separately computed hash. What DKIM requires is that you precompute a sha256 hash (just like you would for RSA-signing) and then feed it to this (oddly-named) "pure" routine for signing. So you get the signature of a SHA512-hash of a SHA256-hash of the headers. Yup, hashed twice. No, I don't know why. But you _can_ do it with the provided interfaces in both GnuTLS and OpenSSL. -- Cheers, Jeremy
- [Dcrup] DKIM-Signing hashes with Ed25519 Дилян Палаузов
- Re: [Dcrup] DKIM-Signing hashes with Ed25519 Jeremy Harris
- Re: [Dcrup] DKIM-Signing hashes with Ed25519 Viktor Dukhovni
- Re: [Dcrup] DKIM-Signing hashes with Ed25519 John Levine
- Re: [Dcrup] DKIM-Signing hashes with Ed25519 Jeremy Harris
- Re: [Dcrup] DKIM-Signing hashes with Ed25519 Salz, Rich