Issues with 2.5.8.

[NIIBE Yutaka]

Lorum Ipsum wrote:
> I just installed GnuPG 2.5.8., and immediately ran into issues with with it. 
>
> The first issue was encrypting data: when attempting to encrypt a message, 
> I got the following error message: 
>
> gpg: pubkey_encrypt failed: Invalid data
> gpg: build_packet(PLAINTEXT) failed: Invalid data
> gpg: lorum_ipsum_setup.txt: sign+encrypt failed: Invalid data
>
> When attempting to decrypt a reply from the nymserver, I got the following: 
>
> gpg: encrypted with secp256k1 key, ID 0xDEADBEEF, created 2025-06-23
>       "Lorum Ipsum <lorum_ipsum at nymph.paranoici.org>"
> gpg: public key decryption failed: Bad secret key
> gpg: decryption failed: Bad secret key

Sorry, those are regressions introduced by me.  The intention of changes
are internal ones to be friendly to crypto API standards.

I'm going to fix the problem.

It's tracked by:
	https://dev.gnupg.org/T7649
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