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Improve performance of RC4_encrypt in utils.py 

Avoid string concatenation until after the loop.
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lmwgv 2018-02-12 11:06:45 +01:00 committed by GitHub
parent a4279cff96
commit fc87287f13
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1 changed files with 3 additions and 3 deletions
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6
PyPDF2/utils.py
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@ -172,14 +172,14 @@ def RC4_encrypt(key, plaintext):
j = (j + S[i] + ord_(key[i % len(key)])) % 256
S[i], S[j] = S[j], S[i]
i, j = 0, 0
retval = b_("")
retval = []
for x in range(len(plaintext)):
i = (i + 1) % 256
j = (j + S[i]) % 256
S[i], S[j] = S[j], S[i]
t = S[(S[i] + S[j]) % 256]
retval += b_(chr(ord_(plaintext[x]) ^ t))
return retval
retval.append(b_(chr(ord_(plaintext[x]) ^ t)))
return b_("").join(retval)
def matrixMultiply(a, b):