Could you please comment on this deltachat message?

Mutual Help
1

I imported the key into DeltaChat 1.49 and tried adding this contact to DeltaChat 2.35.

Failed to receive a message: Error in Secure-Join ‘vc-request’ message handling: failed sending auth-required handshake message: Failed to create send jobs: IO error: Hash digest size (Sha256) must at least match key size (P521(..)): Hash digest size (Sha256) must at least match key size (P521(..)). Please report this bug to delta@merlinux.eu or https://support.delta.chat/.

Delta Chat version 2.35

2

We never generated P-521 keys, their use is not tested and not supported. We use SHA-256 for signatures, but P-521 keys require using at least SHA-512.

Importing the keys is not supported, see FAQ entry and the answer at

I also don’t understand why you want to use NIST P-521 keys, NIST curves are harder to implement securely than Ed25519 and NIST P-521 is just slower than NIST P-256.

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