126 lines
3.8 KiB
Python
126 lines
3.8 KiB
Python
# vim: sw=4:expandtab:foldmethod=marker
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#
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# Copyright (c) 2006, Mathieu Fenniak
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are
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# met:
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#
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# * Redistributions of source code must retain the above copyright notice,
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# this list of conditions and the following disclaimer.
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# * Redistributions in binary form must reproduce the above copyright notice,
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# this list of conditions and the following disclaimer in the documentation
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# and/or other materials provided with the distribution.
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# * The name of the author may not be used to endorse or promote products
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# derived from this software without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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# POSSIBILITY OF SUCH DAMAGE.
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"""
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Utility functions for PDF library.
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"""
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__author__ = "Mathieu Fenniak"
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__author_email__ = "biziqe@mathieu.fenniak.net"
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#ENABLE_PSYCO = False
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#if ENABLE_PSYCO:
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# try:
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# import psyco
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# except ImportError:
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# ENABLE_PSYCO = False
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#
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#if not ENABLE_PSYCO:
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# class psyco:
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# def proxy(func):
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# return func
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# proxy = staticmethod(proxy)
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def readUntilWhitespace(stream, maxchars=None):
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txt = ""
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while True:
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tok = stream.read(1)
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if tok.isspace() or not tok:
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break
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txt += tok
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if len(txt) == maxchars:
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break
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return txt
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def readNonWhitespace(stream):
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tok = ' '
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while tok == '\n' or tok == '\r' or tok == ' ' or tok == '\t':
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tok = stream.read(1)
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return tok
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class ConvertFunctionsToVirtualList(object):
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def __init__(self, lengthFunction, getFunction):
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self.lengthFunction = lengthFunction
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self.getFunction = getFunction
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def __len__(self):
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return self.lengthFunction()
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def __getitem__(self, index):
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if not isinstance(index, int):
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raise TypeError, "sequence indices must be integers"
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len_self = len(self)
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if index < 0:
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# support negative indexes
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index = len_self + index
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if index < 0 or index >= len_self:
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raise IndexError, "sequence index out of range"
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return self.getFunction(index)
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def RC4_encrypt(key, plaintext):
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S = [i for i in range(256)]
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j = 0
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for i in range(256):
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j = (j + S[i] + ord(key[i % len(key)])) % 256
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S[i], S[j] = S[j], S[i]
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i, j = 0, 0
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retval = ""
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for x in range(len(plaintext)):
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i = (i + 1) % 256
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j = (j + S[i]) % 256
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S[i], S[j] = S[j], S[i]
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t = S[(S[i] + S[j]) % 256]
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retval += chr(ord(plaintext[x]) ^ t)
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return retval
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def matrixMultiply(a, b):
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return [[sum([float(i)*float(j)
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for i, j in zip(row, col)]
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) for col in zip(*b)]
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for row in a]
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class PyPdfError(Exception):
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pass
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class PdfReadError(PyPdfError):
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pass
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class PageSizeNotDefinedError(PyPdfError):
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pass
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class PdfReadWarning(UserWarning):
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pass
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if __name__ == "__main__":
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# test RC4
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out = RC4_encrypt("Key", "Plaintext")
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print repr(out)
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pt = RC4_encrypt("Key", out)
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print repr(pt)
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