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;;;;
;;;; Copyright (c) 2008 Zachary Beane, All Rights Reserved
;;;;
;;;; Redistribution and use in source and binary forms, with or without
;;;; modification, are permitted provided that the following conditions
;;;; are met:
;;;;
;;;; * Redistributions of source code must retain the above copyright
;;;; notice, this list of conditions and the following disclaimer.
;;;;
;;;; * Redistributions in binary form must reproduce the above
;;;; copyright notice, this list of conditions and the following
;;;; disclaimer in the documentation and/or other materials
;;;; provided with the distribution.
;;;;
;;;; THIS SOFTWARE IS PROVIDED BY THE AUTHOR 'AS IS' AND ANY EXPRESSED
;;;; OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
;;;; WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
;;;; ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
;;;; DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
;;;; DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
;;;; GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
;;;; INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
;;;; WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
;;;; NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
;;;; SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
;;;;
;;;; crypto.lisp
(in-package #:zs3)
(defparameter *empty-string-sha256*
(ironclad:byte-array-to-hex-string
(ironclad:digest-sequence :sha256 (make-array 0 :element-type 'octet))))
(defparameter *newline-vector*
(make-array 1 :element-type 'octet :initial-element 10))
(defclass digester ()
((hmac
:initarg :hmac
:accessor hmac)
(newline
:initarg :newline
:accessor newline
:allocation :class)
(signed-stream
:initarg :signed-stream
:accessor signed-stream))
(:default-initargs
:signed-stream (make-string-output-stream)
:newline *newline-vector*))
(defun make-digester (key &key (digest-algorithm :sha1))
(when (stringp key)
(setf key (string-octets key)))
(make-instance 'digester
:hmac (ironclad:make-hmac key digest-algorithm)))
(defgeneric add-string (string digester)
(:method (string digester)
(write-string string (signed-stream digester))
(ironclad:update-hmac (hmac digester) (string-octets string))))
(defgeneric add-newline (digester)
(:method (digester)
(terpri (signed-stream digester))
(ironclad:update-hmac (hmac digester) (newline digester))))
(defgeneric add-line (string digester)
(:method (string digester)
(add-string string digester)
(add-newline digester)))
(defgeneric digest (digester)
(:method (digester)
(ironclad:hmac-digest (hmac digester))))
(defgeneric digest64 (digester)
(:method (digester)
(base64:usb8-array-to-base64-string
(ironclad:hmac-digest (hmac digester)))))
(defun file-md5 (file)
(ironclad:digest-file :md5 file))
(defun file-md5/b64 (file)
(base64:usb8-array-to-base64-string (file-md5 file)))
(defun file-md5/hex (file)
(ironclad:byte-array-to-hex-string (file-md5 file)))
(defun file-sha256 (file)
(ironclad:digest-file :sha256 file))
(defun file-sha256/hex (file)
(ironclad:byte-array-to-hex-string (file-sha256 file)))
(defun vector-sha256 (vector)
(ironclad:digest-sequence :sha256 vector))
(defun vector-sha256/hex (vector)
(ironclad:byte-array-to-hex-string (vector-sha256 vector)))
(defun strings-sha256/hex (strings)
(when strings
(let ((digest (ironclad:make-digest :sha256)))
(ironclad:update-digest digest (string-octets (first strings)))
(dolist (string (rest strings))
(ironclad:update-digest digest *newline-vector*)
(ironclad:update-digest digest (string-octets string)))
(ironclad:byte-array-to-hex-string (ironclad:produce-digest digest)))))
(defun strings-hmac-sha256/hex (key strings)
(when strings
(when (stringp key)
(setf key (string-octets key)))
(let ((digest (ironclad:make-hmac key :sha256)))
(ironclad:update-hmac digest (string-octets (first strings)))
(dolist (string (rest strings))
(ironclad:update-hmac digest *newline-vector*)
(ironclad:update-hmac digest (string-octets string)))
(ironclad:byte-array-to-hex-string (ironclad:hmac-digest digest)))))
(defun vector-md5/b64 (vector)
(base64:usb8-array-to-base64-string
(ironclad:digest-sequence :md5 vector)))
(defun file-etag (file)
(format nil "\"~A\"" (file-md5/hex file)))
(defun sign-string (key string)
(let ((digester (make-digester key)))
(add-string string digester)
(digest64 digester)))
(defun hmac-sha256 (key strings)
(let ((digester (make-digester key :digest-algorithm :sha256)))
(if (consp strings)
(dolist (s strings)
(add-string s digester))
(add-string strings digester))
(digest digester)))
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