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(defun derive-key (passphrase &key salt (iteration-count 1000) (key-length 512) (salt-length 64)) "Provided a string passphrase, returns its hashed form along with the salt used for generating it." (let* ((kdf (ironclad:make-kdf 'ironclad:scrypt-kdf :digest :sha1)) (passphrase (flex:string-to-octets passphrase :external-format :utf-8)) (salt (or salt (ironclad:make-random-salt salt-length))) (key (ironclad:derive-key kdf passphrase salt iteration-count key-length)) (result-key (ironclad:byte-array-to-hex-string key)) (result-salt (ironclad:byte-array-to-hex-string salt))) (values result-key result-salt iteration-count)))