nlitsme · July 29, 2022 17:22 · Jul 29, 2022 · Jul 29, 2022
diff --git a/spellmaster.py b/spellmaster.py
@@ -122,7 +122,7 @@ def main():
 
     if not args.sm26:
         global umod26
-        umod26 = umod28
+        umod26 = umod28   # ... not the prettiest solution here....
 
     sm = SpellMasterCipher(args.key)
     for txt in args.textdata:

diff --git a/spellmaster.py b/spellmaster.py
@@ -0,0 +1,142 @@
+"""
+PT/CT pairs
+
+Key       expanded    Plaintext                      Ciphertext
+AAAAAAAA  AAAAAAAA    AAAAAAAAAA                     VTPL?DL?HV
+AAAAAAAA  AAAAAAAA    ABCDEFGHIJKLMNOPQRSTUVWXY      VMHTL?QFPCBKSZCJGRZM-EEEZ
+AAAA      AAAAAAAA    BBBB                           OTBZ
+AAAAAAAA  AAAAAAAA    BBBBBBBBBB                     OTBZNRZNVA
+AAAAAAAA  AAAAAAAA    BBBBBBBBBBBBBBBB               OTBZNRZNVAJRJFVR
+AAA       AAAAAAAA    BBBBBBBBBBBBBBBBBBBBBBBBB      OTBZNRZNVAJRJFVRVVOTVBBJB
+AAAAAAAA  AAAAAAAA    BCDEFGHIJKLMNOPQRSTUVWXYZ      OLXXXIRHMTOWV-JWBPCGQEIFY
+AAAAAAAA  AAAAAAAA    CDEFGHIJKLMNOPQRSTUVWXYZA      GN?HEJTIUVSJOV-ZLVFSUYZEH
+AAAAAAAA  AAAAAAAA    DEFGHIJKLMNOPQRSTUVWXYZAB      ABHIRHMYSZVONCRTFEJSUZAHA
+AAAAAAAA  AAAAAAAA    IS-SPELLMASTER-ALIVE?          PRQGBETNKDV?EHYE-RELK
+BBBBBBBB  BBBBBBBB    IS-SPELLMASTER-ALIVE?          XERHCFUOLZWAFIZF?SM-L 
+CAT       CATCATCA    DOGSDOGSDOGSDOGS               QLGAGVHPOCWEXCID
+CATS      CATSCATS    DOGSDOGSDOGSDOGS               WXCQ-DSUCEKQD-WU
+SECRECY   SECRECYS    CRYPTOMUSEUM-FOREVER           LRCHZHE-GQBBSJROQ--R
+SECRECY   SECRECYS    LONG-LIVE-CRYPTOMUSEUM         ?HIJVVI-XLXOKRKI?SKIQX
+
+see  https://www.reddit.com/r/codes/comments/wa8g4i/cryptomuseum_is_looking_for_help_in_figuring_out/
+
+Code by itsme@xs4all.nl.
+
+https://github.com/nlitsme
+
+"""
+def umod28(c):
+    c %= 28
+    if c<0: c += 28
+    return c
+
+def umod26(c):
+    c %= 26
+    if c<0: c += 26
+    return c
+
+def to28(x):
+    return x.replace('-', '[').replace('?', '\\')
+def from28(x):
+    return x.replace('[', '-').replace('\\', '?')
+
+def smod256(c):
+    c %= 256
+    if c<-128: c += 256
+    if c>127: c -= 256
+    return c
+
+
+
+class SpellMasterCipher:
+    def __init__(self, key = None):
+        if key is None:
+            key = "FRANKLIN"
+        while len(key) < 8:
+            key = key + key
+        self.key = key[:8]
+
+        self.DecodeXlate = [ 3, 12, 16, 10, 9, 22, 11, 0, 20, 6, 14, 24, 5, 8, 1, 18, 17, 7, 4, 15, 19, 25, 2, 13, 21, 23, 26, 27 ]
+        self.EncodeXlate = [ 7, 14, 22, 0, 18, 12, 9, 17, 13, 4, 3, 6, 1, 23, 10, 19, 2, 16, 15, 20, 8, 24, 5, 25, 11, 21, 26, 27 ]
+
+    def encode(self, text):
+        # Convert input text to 0-27 range
+        word_buf = [ self.EncodeXlate[ord(c)-ord('A')] for c in text ]
+
+        # Take copy of the key
+        tempcode = [ ord(c) for c in self.key ]
+
+        # Encrypt the text
+        result = []
+        for c in word_buf:
+
+            # Calculate key
+            key = umod26(smod256((sum(tempcode) - 8 * ord('A'))))
+
+            # Apply key
+            result.append( umod26(key - c) )
+
+            # Modify key
+            key = umod26(key + c)
+
+            tempcode = tempcode[1:] + [ key ]
+
+        return "".join(chr(c+ord('A')) for c in result)
+
+    def decode(self, text):
+        # Convert input text to 0-27 range
+        word_buf = [ ord(c)-ord('A') for c in text ]
+
+        # Take copy of the key
+        tempcode = [ ord(c) for c in self.key ]
+
+        # decrypt the text
+        result = []
+        for c in word_buf:
+
+            # Calculate key
+            key = umod26(smod256((sum(tempcode) - 8 * ord('A'))))
+
+            # Apply key
+            result.append( umod26(key - c) )
+
+            # Modify key
+            key = umod26(key + result[-1])
+
+            tempcode = tempcode[1:] + [ key ]
+
+        # Convert result back to ASCII range
+        return "".join(chr(self.DecodeXlate[c]+ord('A')) for c in result)
+
+
+def main():
+    import argparse
+    parser = argparse.ArgumentParser(description='spellmaster decrypt')
+    parser.add_argument('--key', '-k', type=str)
+    parser.add_argument('--decrypt', '-d', action='store_true')
+    parser.add_argument('--encrypt', '-e', action='store_true')
+    parser.add_argument('--sm26', action='store_true', help='code from the patent')
+    parser.add_argument('textdata', nargs='*', type=str)
+
+    args = parser.parse_args()
+
+    if not args.sm26:
+        global umod26
+        umod26 = umod28
+
+    sm = SpellMasterCipher(args.key)
+    for txt in args.textdata:
+        if not args.sm26:
+            txt = to28(txt)
+        if args.decrypt:
+            res = sm.decode(txt)
+        else:
+            res = sm.encode(txt)
+        if not args.sm26:
+            res = from28(res)
+        print(res)
+
+
+if __name__ == '__main__':
+    main()
+
diff --git a/testvectors.sh b/testvectors.sh
@@ -0,0 +1,33 @@
+
+python3 spellmaster.py -e -k    AAAAAAAA      AAAAAAAAAA
+python3 spellmaster.py -e -k    AAAAAAAA      ABCDEFGHIJKLMNOPQRSTUVWXY
+python3 spellmaster.py -e -k    AAAA          BBBB
+python3 spellmaster.py -e -k    AAAAAAAA      BBBBBBBBBB
+python3 spellmaster.py -e -k    AAAAAAAA      BBBBBBBBBBBBBBBB
+python3 spellmaster.py -e -k    AAA           BBBBBBBBBBBBBBBBBBBBBBBBB
+python3 spellmaster.py -e -k    AAAAAAAA      BCDEFGHIJKLMNOPQRSTUVWXYZ
+python3 spellmaster.py -e -k    AAAAAAAA      CDEFGHIJKLMNOPQRSTUVWXYZA
+python3 spellmaster.py -e -k    AAAAAAAA      DEFGHIJKLMNOPQRSTUVWXYZAB
+python3 spellmaster.py -e -k    AAAAAAAA      IS-SPELLMASTER-ALIVE?
+python3 spellmaster.py -e -k    BBBBBBBB      IS-SPELLMASTER-ALIVE?
+python3 spellmaster.py -e -k    CAT           DOGSDOGSDOGSDOGS
+python3 spellmaster.py -e -k    CATS          DOGSDOGSDOGSDOGS
+python3 spellmaster.py -e -k    SECRECY       CRYPTOMUSEUM-FOREVER
+python3 spellmaster.py -e -k    SECRECY       LONG-LIVE-CRYPTOMUSEUM
+
+
+python3 spellmaster.py -d -k    AAAAAAAA      VTPL?DL?HV
+python3 spellmaster.py -d -k    AAAAAAAA      VMHTL?QFPCBKSZCJGRZM-EEEZ
+python3 spellmaster.py -d -k    AAAA          OTBZ
+python3 spellmaster.py -d -k    AAAAAAAA      OTBZNRZNVA
+python3 spellmaster.py -d -k    AAAAAAAA      OTBZNRZNVAJRJFVR
+python3 spellmaster.py -d -k    AAA           OTBZNRZNVAJRJFVRVVOTVBBJB
+python3 spellmaster.py -d -k    AAAAAAAA      OLXXXIRHMTOWV-JWBPCGQEIFY
+python3 spellmaster.py -d -k    AAAAAAAA      GN?HEJTIUVSJOV-ZLVFSUYZEH
+python3 spellmaster.py -d -k    AAAAAAAA      ABHIRHMYSZVONCRTFEJSUZAHA
+python3 spellmaster.py -d -k    AAAAAAAA      PRQGBETNKDV?EHYE-RELK
+python3 spellmaster.py -d -k    BBBBBBBB      XERHCFUOLZWAFIZF?SM-L
+python3 spellmaster.py -d -k    CAT           QLGAGVHPOCWEXCID
+python3 spellmaster.py -d -k    CATS          WXCQ-DSUCEKQD-WU
+python3 spellmaster.py -d -k    SECRECY       LRCHZHE-GQBBSJROQ--R
+python3 spellmaster.py -d -k    SECRECY       ?HIJVVI-XLXOKRKI?SKIQX
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