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libsodium is an awesome encryption library, and GnuPG is an awesome key management and signing software.
GnuPG recently released support for Ed25519 signing keys, and submitted a draft to the IETF.
I want to use Sodium-generated keys by my web application offline with GnuPG. This will make it so I don't have to trust the server with my private key each time I sign, and I don't have to use special software on my client (even if I have to write it) since I already have and trust GnuPG.
How can I do so? How do I convert libsodium private keys to OpenPGP compatible private key packets?
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Private and Public Keys The private key (k) is a number, usually picked at random. From the private key, we use elliptic curve multiplication, a one-way cryptographic function, to generate a public key (K). From the public key (K), we use a one-way cryptographic hash function to generate a bitcoin address (A).
libsodium uses the xsalsa20 algorithm for encryption. This algorithm is not currently supported with PGP, and in turn, is not supported by GnuPG.
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