On 06/27/2015 03:29 AM, Peter Otten wrote:
Would it be sufficient to prepend the chunk with one block, say, of random
data? To unmangle you'd just strip off that block.
BLOCK = os.urandom(BLOCKSIZE)
def mangle(source, dest):
dest.write(BLOCK)
shutil.copyfileobj(source, dest)
def unmangle(source, dest):
source.read(BLOCKSIZE)
shutil.copyfileobj(source, dest)
Disclaimer: I did not follow the ongoing discussion.
That is happening as a side effect. Though not completely random, after
running the data through a translation table, the 256 byte table is
prepended. Then a 4 byte checksum is calculated and prepended.
-Randall
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