gpg: can't handle public key algorithm 18

[Todd Zullinger]

Mike Schleif wrote:
> $ gpg --version
> gpg (GnuPG) 2.0.22
> libgcrypt 1.5.3
> 
> $ cat /etc/system-release
> CentOS Linux release 7.9.2009 (Core)

Algorithm 18 is ECDH, which is not supported by gpg on
CentOS 7.  You can confirm this in the Pubkey line of the
gpg --version output:

  $ gpg --version
  gpg (GnuPG) 2.0.22
  libgcrypt 1.5.3
  [...]

  Home: ~/.gnupg
  Supported algorithms:
  Pubkey: RSA, ?, ?, ELG, DSA
  Cipher: IDEA, 3DES, CAST5, BLOWFISH, AES, AES192, AES256, TWOFISH,
	  CAMELLIA128, CAMELLIA192, CAMELLIA256
  Hash: MD5, SHA1, RIPEMD160, SHA256, SHA384, SHA512, SHA224
  Compression: Uncompressed, ZIP, ZLIB, BZIP2

On a newer Fedora system, ECDH is present:

  $ gpg --version --no-copyright
  gpg (GnuPG) 2.4.0
  libgcrypt 1.10.1-unknown
  [...]

  Home: /home/user/.gnupg
  Supported algorithms:
  Pubkey: RSA, ELG, DSA, ECDH, ECDSA, EDDSA
  Cipher: IDEA, 3DES, CAST5, BLOWFISH, AES, AES192, AES256, TWOFISH,
	  CAMELLIA128, CAMELLIA192, CAMELLIA256
  Hash: SHA1, RIPEMD160, SHA256, SHA384, SHA512, SHA224
  Compression: Uncompressed, ZIP, ZLIB, BZIP2

-- 
Todd
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