In-reply-to » here is my progress so far: https://github.com/eapl-gemugami/twtxt-direct-message-php The encryption part seems to work, if I decrypt it the message with OpenSSL. I think it can help you for some key parts not well explained in OpenSSL documentation.

@eapl.me@eapl.me @andros@twtxt.andros.dev Eureka! It works! https://github.com/upputter/testing-twtxt-dm
PBKDF2_KEY_SIZE = 48 was the turning point! My dirty little crypt.class.php can en- and decrypt, accoridng to the OpenSSL standard and options used in https://twtxt.dev/exts/direct-message.html

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