On Wed, 30 Oct 2019 17:19, Brian Minton said: > My guess is, the gpg one also is doing MDC, so you'd have to add the > equivalent HMAC code to openssl, but that's just a complete guess.
The OpenPGP MDC is a SHA-1 hash appended to the plaintext and then encrypted along with the data. The usual OpenPGP packet structure is used; details are in RFC-4880. Further OpenPGP's symmetric encryption uses a random session key and encrypts that session key using the passphrase as key. This allows to have several independent passphrases or public keys for the same data. You can't easily implement that with OpenSSL in a script. Shalom-Salam, Werner -- Die Gedanken sind frei. Ausnahmen regelt ein Bundesgesetz.
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