ed25519 and sha256

Robert Hübener huebener at gmail.com
Wed Sep 25 12:44:02 CEST 2019


I have a question regarding ed25519 as implemented in gnupg 2.2.17, libgcrypt 1.8.4.

Let’s say I sign a file. When checking the signature with verbose output, I can see that sha256 was used

gpg: binary signature, digest algorithm SHA256, key algorithm ed25519

According to Wikipedia "Ed25519 is the EdDSA signature scheme using SHA-512 and Curve25519”. Granted, I have sha256 in my preferences, but the standard should override that, correct? I wonder, because in a different application (iPGMail) using the same key with the same embedded preferences, sha512 is used.


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