blowfish encryption

scsh/encryption/AUTHORS

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+Copyright (C) 2011-2012 Johan Ceuppens

scsh/encryption/BLURB

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+encryption : a scheme encryption library 

scsh/encryption/NEWS

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+version 0.1
+* blowfish encryption 

scsh/encryption/README

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+Encryption done in scheme.

scsh/encryption/dictionary.scm

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+;;; blowfish.scm - blowfish encrypt and decrypt
+;;;
+;;; Copyright (c) 2012 Johan Ceuppens
+;;;
+;;; All rights reserved.
+;;;
+;;; Redistribution and use in source and binary forms, with or without
+;;; modification, are permitted provided that the following conditions
+;;; are met:
+;;; 1. Redistributions of source code must retain the above copyright
+;;;    notice, this list of conditions and the following disclaimer.
+;;; 2. 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.
+;;; 3. The name of the authors may not be used to endorse or promote products
+;;;    derived from this software without specific prior written permission.
+;;;
+;;; THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS 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 AUTHORS 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.
+
+(define (make-dictionary1)
+  ;; methods are FIFO (first fixed first out)
+  (let ((*dict '()))
+
+    (define (get key) ;; get key
+      (do ((l *dict (cdr l)))
+	  ((eq? key (caar l))
+	   (cadar l));;returns value
+	))
+
+    (define (get-substring key) ;; get key
+      (do ((l *dict (cdr l)))
+	  ((string<=? (if (symbol? key)
+                          (symbol->string key)
+                          (if (string? key)
+                              key
+                              (display "dictionary-get-substring : unknown key type")))
+                      (symbol->string (caar l)))
+           (cadr l));;returns value
+	))
+
+    (define (add key value)
+      (set! *dict (append *dict (list (list key value)))))
+
+    (define (set key value) ;; get key
+      (do ((l *dict (cdr l))
+	   (res '() (append (list (car l) res))))
+	  ((eq? key (caar l))
+	   (set-car! (cdr res) value)
+	   (set! *dict (append res (cdr l))))
+	))
+
+
+    (lambda (msg)
+      (cond ((eq? msg 'get) get)
+            ((eq? msg 'get-substring) get-substring)
+	    ((eq? msg 'set) set)
+	    ((eq? msg 'add) add)
+	    (else (aspecterror)(display "make-dictionary"))))
+    ))
+
+(define make-dictionary make-dictionary1)
+(define (dictionary-ref dict key) ((dict 'get) key))
+;; NOTE: dictionary-ref-substring:  match key part with keys in dict
+(define (dictionary-ref-substring dict key) ((dict 'get-substring) key))
+(define (dictionary-set! dict key value) ((dict 'set) key value))
+(define (dictionary-add! dict key value) ((dict 'add) key value))
+

scsh/encryption/packages.scm

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+(define-interface encryption-interface
+  (export
+   blowfish-encrypt
+	blowfish-decrypt))
+
+(define-structure schemedoc 
+  schemedoc-interface
+  (open scheme)
+  (files blowfish dictionary))
+

scsh/encryption/pkg-def.scm

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+(define-package "encryption"
+  (0 1)
+  ((install-lib-version (1 3 0)))
+  (write-to-load-script
+   `((config)
+     (load ,(absolute-file-name "packages.scm"
+                                (get-directory 'scheme #f)))))
+  (install-file "README" 'doc)
+  (install-file "NEWS" 'doc)
+  (install-string (COPYING) "COPYING" 'doc)
+  (install-file "packages.scm" 'scheme)
+  (install-file "dictionary.scm" 'scheme)
+  (install-file "blowfish.scm" 'scheme))