50 lines
2.2 KiB
Python
50 lines
2.2 KiB
Python
# This excerpt is dual licensed under the terms of the Apache License, Version
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# 2.0, and the BSD License. See the LICENSE file at
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# https://github.com/pyca/cryptography/blob/master/LICENSE for complete details.
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#
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# The Apache 2.0 license has been included as Apache-2.0.txt in this collection.
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#
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# Adapted from cryptography's hazmat/backends/openssl/decode_asn1.py
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#
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# Copyright (c) 2015, 2016 Paul Kehrer (@reaperhulk)
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# Copyright (c) 2017 Fraser Tweedale (@frasertweedale)
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# Relevant commits from cryptography project (https://github.com/pyca/cryptography):
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# pyca/cryptography@719d536dd691e84e208534798f2eb4f82aaa2e07
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# pyca/cryptography@5ab6d6a5c05572bd1c75f05baf264a2d0001894a
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# pyca/cryptography@2e776e20eb60378e0af9b7439000d0e80da7c7e3
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# pyca/cryptography@fb309ed24647d1be9e319b61b1f2aa8ebb87b90b
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# pyca/cryptography@2917e460993c475c72d7146c50dc3bbc2414280d
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# pyca/cryptography@3057f91ea9a05fb593825006d87a391286a4d828
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# pyca/cryptography@d607dd7e5bc5c08854ec0c9baff70ba4a35be36f
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from __future__ import absolute_import, division, print_function
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__metaclass__ = type
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# WARNING: this function no longer works with cryptography 35.0.0 and newer!
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# It must **ONLY** be used in compatibility code for older
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# cryptography versions!
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def obj2txt(openssl_lib, openssl_ffi, obj):
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# Set to 80 on the recommendation of
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# https://www.openssl.org/docs/crypto/OBJ_nid2ln.html#return_values
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#
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# But OIDs longer than this occur in real life (e.g. Active
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# Directory makes some very long OIDs). So we need to detect
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# and properly handle the case where the default buffer is not
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# big enough.
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#
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buf_len = 80
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buf = openssl_ffi.new("char[]", buf_len)
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# 'res' is the number of bytes that *would* be written if the
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# buffer is large enough. If 'res' > buf_len - 1, we need to
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# alloc a big-enough buffer and go again.
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res = openssl_lib.OBJ_obj2txt(buf, buf_len, obj, 1)
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if res > buf_len - 1: # account for terminating null byte
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buf_len = res + 1
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buf = openssl_ffi.new("char[]", buf_len)
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res = openssl_lib.OBJ_obj2txt(buf, buf_len, obj, 1)
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return openssl_ffi.buffer(buf, res)[:].decode()
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