Generating NIST/Brainpool subkeys with GPGME

[Jacob Adams]

It appears that one cannot currently generate NIST or Brainpool subkeys
with GPGME. Using GPG itself works fine with --expert, so am I missing
an option or is this simply not possible yet?

I've attached a simple test program and the output I get on my machine
is below:

./eccsubkeys rsa1024
GPGME Version: 1.11.1
GPG Version: 2.2.8
Master: 2D14FBF15919954E4334D451C67CB3237C3CFFF4
Signing: A8B50168D9051846A570445A5DD5249F5CD0825F
Encryption: F8D8B9A453E5A7E98F44CC029F8450A1638414BE
Authentication: 866E75EDC8BDEB4B5A4DBD62865FAF7AB6DE6367

./eccsubkeys nistp384


GPGME Version: 1.11.1
GPG Version: 2.2.8
Master: 27A05F867C37442B675CFC1B9C647EA952B0D156
GPGME: General error

./eccsubkeys brainpoolP384r1


GPGME Version: 1.11.1
GPG Version: 2.2.8
Master: 26B2C8D94AD12A160262C82FED06C709E119D584
GPGME: General error


Thanks,
Jacob
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