mirror of https://github.com/dirtbags/moth.git
61 lines
1.3 KiB
Plaintext
61 lines
1.3 KiB
Plaintext
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#! /usr/bin/python
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import os
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import sys
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import md5
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import cStringIO as StringIO
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key = 'breadfruit chawbacon'
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src = os.path.dirname(sys.argv[0])
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class md5file:
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def __init__(self, fn='outf.bin'):
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self.fn = fn
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self.f = open(fn, 'wb')
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self.m = md5.new()
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def write(self, s):
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self.f.write(s)
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self.m.update(s)
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def close(self):
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self.f.close()
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os.rename(self.fn, self.m.hexdigest())
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os.system('wget -O lena.tif http://www.cs.cmu.edu/~chuck/lennapg/lena_std.tif')
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inf = os.popen('tifftopnm lena.tif', 'rb')
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version = inf.readline()
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dimensions = inf.readline()
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depth = inf.readline()
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# Read in plaintext
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noise = open(os.path.join(src, 'noise.txt')).read()
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noise += '\n\nThe key is "%s".\n' % key
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noise = StringIO.StringIO(noise)
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# Set the low-order bits in output file
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outf = md5file()
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outf.write(version)
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outf.write(dimensions)
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outf.write(depth)
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i = 0
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while True:
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c = noise.read(1)
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if c:
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c = ord(c)
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else:
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c = 0
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img_bytes = inf.read(8)
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if not img_bytes:
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break
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for j in range(8):
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bit = 7 - j
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img_byte = ord(img_bytes[j]) & 0xFE
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noise_bit = (c & (1<<bit)) >> bit
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out_byte = img_byte | noise_bit
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outf.write(chr(out_byte))
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outf.close()
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open('key', 'w').write(key)
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os.unlink('lena.tif')
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