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"""fontTools.misc.eexec.py -- Module implementing the eexec and
charstring encryption algorithm as used by PostScript Type 1 fonts.
"""
from __future__ import print_function, division, absolute_import
from fontTools.misc.py23 import *
def _decryptChar(cipher, R):
cipher = byteord(cipher)
plain = ( (cipher ^ (R>>8)) ) & 0xFF
R = ( (cipher + R) * 52845 + 22719 ) & 0xFFFF
return bytechr(plain), R
def _encryptChar(plain, R):
plain = byteord(plain)
cipher = ( (plain ^ (R>>8)) ) & 0xFF
R = ( (cipher + R) * 52845 + 22719 ) & 0xFFFF
return bytechr(cipher), R
def decrypt(cipherstring, R):
plainList = []
for cipher in cipherstring:
plain, R = _decryptChar(cipher, R)
plainList.append(plain)
plainstring = strjoin(plainList)
return plainstring, int(R)
def encrypt(plainstring, R):
cipherList = []
for plain in plainstring:
cipher, R = _encryptChar(plain, R)
cipherList.append(cipher)
cipherstring = strjoin(cipherList)
return cipherstring, int(R)
def hexString(s):
import binascii
return binascii.hexlify(s)
def deHexString(h):
import binascii
h = strjoin(h.split())
return binascii.unhexlify(h)
def _test():
testStr = "\0\0asdadads asds\265"
print(decrypt, decrypt(testStr, 12321))
print(encrypt, encrypt(testStr, 12321))
if __name__ == "__main__":
_test()
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