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bpo-31659: Use simple slicing to format PEM cert (GH-3849)

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DER_cert_to_PEM_cert() used textwrap.fill() to format PEM.
But it's library to wrap lines on word boundary, while PEM is
base64 encoded string.

Additionally, importing textwrap is little slow.
This commit is contained in:
INADA Naoki 2017-10-02 16:33:42 +09:00 • committed by GitHub
parent edc05c5d88
commit b75a228af8
1 changed files with 4 additions and 4 deletions
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8
Lib/ssl.py
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@ -91,7 +91,6 @@ ALERT_DESCRIPTION_UNKNOWN_PSK_IDENTITY
"""
import ipaddress
import textwrap
import re
import sys
import os
@ -1201,9 +1200,10 @@ def DER_cert_to_PEM_cert(der_cert_bytes):
PEM version of it as a string."""
f = str(base64.standard_b64encode(der_cert_bytes), 'ASCII', 'strict')
return (PEM_HEADER + '\n' +
textwrap.fill(f, 64) + '\n' +
PEM_FOOTER + '\n')
ss = [PEM_HEADER]
ss += [f[i:i+64] for i in range(0, len(f), 64)]
ss.append(PEM_FOOTER + '\n')
return '\n'.join(ss)
def PEM_cert_to_DER_cert(pem_cert_string):
"""Takes a certificate in ASCII PEM format and returns the