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# coding: utf-8 """ Encoding DER to PEM and decoding PEM to DER. Exports the following items: - armor() - detect() - unarmor() """ from __future__ import unicode_literals, division, absolute_import, print_function import base64 import re import sys from ._errors import unwrap from ._types import type_name as _type_name, str_cls, byte_cls if sys.version_info < (3,): from cStringIO import StringIO as BytesIO else: from io import BytesIO def detect(byte_string): """ Detect if a byte string seems to contain a PEM-encoded block :param byte_string: A byte string to look through :return: A boolean, indicating if a PEM-encoded block is contained in the byte string """ if not isinstance(byte_string, byte_cls): raise TypeError(unwrap( ''' byte_string must be a byte string, not %s ''', _type_name(byte_string) )) return byte_string.find(b'-----BEGIN') != -1 or byte_string.find(b'---- BEGIN') != -1 def armor(type_name, der_bytes, headers=None): """ Armors a DER-encoded byte string in PEM :param type_name: A unicode string that will be capitalized and placed in the header and footer of the block. E.g. "CERTIFICATE", "PRIVATE KEY", etc. This will appear as "-----BEGIN CERTIFICATE-----" and "-----END CERTIFICATE-----". :param der_bytes: A byte string to be armored :param headers: An OrderedDict of the header lines to write after the BEGIN line :return: A byte string of the PEM block """ if not isinstance(der_bytes, byte_cls): raise TypeError(unwrap( ''' der_bytes must be a byte string, not %s ''' % _type_name(der_bytes) )) if not isinstance(type_name, str_cls): raise TypeError(unwrap( ''' type_name must be a unicode string, not %s ''', _type_name(type_name) )) type_name = type_name.upper().encode('ascii') output = BytesIO() output.write(b'-----BEGIN ') output.write(type_name) output.write(b'-----\n') if headers: for key in headers: output.write(key.encode('ascii')) output.write(b': ') output.write(headers[key].encode('ascii')) output.write(b'\n') output.write(b'\n') b64_bytes = base64.b64encode(der_bytes) b64_len = len(b64_bytes) i = 0 while i < b64_len: output.write(b64_bytes[i:i + 64]) output.write(b'\n') i += 64 output.write(b'-----END ') output.write(type_name) output.write(b'-----\n') return output.getvalue() def _unarmor(pem_bytes): """ Convert a PEM-encoded byte string into one or more DER-encoded byte strings :param pem_bytes: A byte string of the PEM-encoded data :raises: ValueError - when the pem_bytes do not appear to be PEM-encoded bytes :return: A generator of 3-element tuples in the format: (object_type, headers, der_bytes). The object_type is a unicode string of what is between "-----BEGIN " and "-----". Examples include: "CERTIFICATE", "PUBLIC KEY", "PRIVATE KEY". The headers is a dict containing any lines in the form "Name: Value" that are right after the begin line. """ if not isinstance(pem_bytes, byte_cls): raise TypeError(unwrap( ''' pem_bytes must be a byte string, not %s ''', _type_name(pem_bytes) )) # Valid states include: "trash", "headers", "body" state = 'trash' headers = {} base64_data = b'' object_type = None found_start = False found_end = False for line in pem_bytes.splitlines(False): if line == b'': continue if state == "trash": # Look for a starting line since some CA cert bundle show the cert # into in a parsed format above each PEM block type_name_match = re.match(b'^(?:---- |-----)BEGIN ([A-Z0-9 ]+)(?: ----|-----)', line) if not type_name_match: continue object_type = type_name_match.group(1).decode('ascii') found_start = True state = 'headers' continue if state == 'headers': if line.find(b':') == -1: state = 'body' else: decoded_line = line.decode('ascii') name, value = decoded_line.split(':', 1) headers[name] = value.strip() continue if state == 'body': if line[0:5] in (b'-----', b'---- '): der_bytes = base64.b64decode(base64_data) yield (object_type, headers, der_bytes) state = 'trash' headers = {} base64_data = b'' object_type = None found_end = True continue base64_data += line if not found_start or not found_end: raise ValueError(unwrap( ''' pem_bytes does not appear to contain PEM-encoded data - no BEGIN/END combination found ''' )) def unarmor(pem_bytes, multiple=False): """ Convert a PEM-encoded byte string into a DER-encoded byte string :param pem_bytes: A byte string of the PEM-encoded data :param multiple: If True, function will return a generator :raises: ValueError - when the pem_bytes do not appear to be PEM-encoded bytes :return: A 3-element tuple (object_name, headers, der_bytes). The object_name is a unicode string of what is between "-----BEGIN " and "-----". Examples include: "CERTIFICATE", "PUBLIC KEY", "PRIVATE KEY". The headers is a dict containing any lines in the form "Name: Value" that are right after the begin line. """ generator = _unarmor(pem_bytes) if not multiple: return next(generator) return generator
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