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| -<html>
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| -<title>
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| -PyASN1 reference manual
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| -</title>
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| -<head>
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| -</head>
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| -<body>
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| -<center>
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| -<table width=60%>
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| -<tr>
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| -<td>
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| -
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| -<h3>
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| -PyASN1 reference manual
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| -</h3>
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| -
|
| -<p align=right>
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| -<i>written by <a href=mailto:ilya@glas.net>Ilya Etingof</a>, 2011-2012</i>
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| -</p>
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| -
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| -<p>
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| -Free and open-source pyasn1 library makes it easier for programmers and
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| -network engineers to develop, debug and experiment with ASN.1-based protocols
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| -using Python programming language as a tool.
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| -</p>
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| -
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| -<p>
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| -Abstract Syntax Notation One
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| -(<a href=http://en.wikipedia.org/wiki/Abstract_Syntax_Notation_1x>ASN.1</a>)
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| -is a set of
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| -<a href=http://www.itu.int/ITU-T/studygroups/com17/languages/X.680-X.693-0207w.zip>
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| -ITU standards</a> concered with provisioning instrumentation for developing
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| -data exchange protocols in a robust, clear and interoperabable way for
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| -various IT systems and applications. Most of the efforts are targeting the
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| -following areas:
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| -<ul>
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| -<li>Data structures: the standard introduces a collection of basic data types
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| -(similar to integers, bits, strings, arrays and records in a programming
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| -language) that can be used for defining complex, possibly nested data
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| -structures representing domain-specific data units.
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| -<li>Serialization protocols: domain-specific data units expressed in ASN.1
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| -types could be converted into a series of octets for storage or transmission
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| -over the wire and then recovered back into their structured form on the
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| -receiving end. This process is immune to various hardware and software
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| -related dependencies.
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| -<li>Data description language: could be used to describe particular set of
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| -domain-specific data structures and their relationships. Such a description
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| -could be passed to an ASN.1 compiler for automated generation of program
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| -code that represents ASN.1 data structures in language-native environment
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| -and handles data serialization issues.
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| -</ul>
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| -</p>
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| -
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| -<p>
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| -This tutorial and algorithms, implemented by pyasn1 library, are
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| -largely based on the information read in the book
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| -<a href="http://www.oss.com/asn1/dubuisson.html">
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| -ASN.1 - Communication between heterogeneous systems</a>
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| -by Olivier Dubuisson. Another relevant resource is
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| -<a href=ftp://ftp.rsasecurity.com/pub/pkcs/ascii/layman.asc>
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| -A Layman's Guide to a Subset of ASN.1, BER, and DER</a> by Burton S. Kaliski.
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| -It's advised to refer to these books for more in-depth knowledge on the
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| -subject of ASN.1.
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| -</p>
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| -
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| -<p>
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| -As of this writing, pyasn1 library implements most of standard ASN.1 data
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| -structures in a rather detailed and feature-rich manner. Another highly
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| -important capability of the library is its data serialization facilities.
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| -The last component of the standard - ASN.1 compiler is planned for
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| -implementation in the future.
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| -</p>
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| -
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| -</p>
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| -The pyasn1 library was designed to follow the pre-1995 ASN.1 specification
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| -(also known as X.208). Later, post 1995, revision (X.680) introduced
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| -significant changes most of which have not yet been supported by pyasn1.
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| -</p>
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| -
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| -<h3>
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| -Table of contents
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| -</h3>
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| -
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| -<p>
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| -<ul>
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| -<li><a href="scalar.html">1. Data model for ASN.1 types</a>
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| -<li><a href="scalar.html#1.1">1.1 Scalar types</a>
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| -<li><a href="scalar.html#1.1.1">1.1.1 Boolean type</a>
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| -<li><a href="scalar.html#1.1.2">1.1.2 Null type</a>
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| -<li><a href="scalar.html#1.1.3">1.1.3 Integer type</a>
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| -<li><a href="scalar.html#1.1.4">1.1.4 Enumerated type</a>
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| -<li><a href="scalar.html#1.1.5">1.1.5 Real type</a>
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| -<li><a href="scalar.html#1.1.6">1.1.6 Bit string type</a>
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| -<li><a href="scalar.html#1.1.7">1.1.7 OctetString type</a>
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| -<li><a href="scalar.html#1.1.8">1.1.8 ObjectIdentifier type</a>
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| -<li><a href="scalar.html#1.1.9">1.1.9 Character string types</a>
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| -<li><a href="scalar.html#1.1.10">1.1.10 Useful types</a>
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| -<li><a href="tagging.html">1.2 Tagging</a>
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| -<li><a href="constructed.html">1.3 Constructed types</a>
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| -<li><a href="constructed.html#1.3.1">1.3.1 Sequence and Set types</a>
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| -<li><a href="constructed.html#1.3.2">1.3.2 SequenceOf and SetOf types</a>
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| -<li><a href="constructed.html#1.3.3">1.3.3 Choice type</a>
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| -<li><a href="constructed.html#1.3.4">1.3.4 Any type</a>
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| -<li><a href="constraints.html">1.4 Subtype constraints</a>
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| -<li><a href="constraints.html#1.4.1">1.4.1 Single value constraint</a>
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| -<li><a href="constraints.html#1.4.2">1.4.2 Value range constraint</a>
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| -<li><a href="constraints.html#1.4.3">1.4.3 Size constraint</a>
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| -<li><a href="constraints.html#1.4.4">1.4.4 Alphabet constraint</a>
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| -<li><a href="constraints.html#1.4.5">1.4.5 Constraint combinations</a>
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| -<li><a href="constraints.html#1.5">1.5 Types relationships</a>
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| -<li><a href="codecs.html">2. Codecs</a>
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| -<li><a href="codecs.html#2.1">2.1 Encoders</a>
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| -<li><a href="codecs.html#2.2">2.2 Decoders</a>
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| -<li><a href="codecs.html#2.2.1">2.2.1 Decoding untagged types</a>
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| -<li><a href="codecs.html#2.2.2">2.2.2 Ignoring unknown types</a>
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| -</ul>
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| -
|
| -<p>
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| -Although pyasn1 software is almost a decade old and used in many production
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| -environments, it still may have bugs and non-implemented pieces. Anyone
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| -who happens to run into such defect is welcome to complain to
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| -<a href=mailto:pyasn1-users@lists.sourceforge.net>pyasn1 mailing list</a>
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| -or better yet fix the issue and send
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| -<a href=mailto:ilya@glas.net>me</a> the patch.
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| -</p>
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| -
|
| -<p>
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| -Typically, pyasn1 is used for building arbitrary protocol support into
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| -various applications. This involves manual translation of ASN.1 data
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| -structures into their pyasn1 implementations. To save time and effort,
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| -data structures for some of the popular protocols are pre-programmed
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| -and kept for further re-use in form of the
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| -<a href=http://sourceforge.net/projects/pyasn1/files/pyasn1-modules/>
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| -pyasn1-modules package</a>. For instance, many structures for PKI (X.509,
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| -PKCS#*, CRMF, OCSP), LDAP and SNMP are present.
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| -Applications authors are advised to import and use relevant modules
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| -from that package whenever needed protocol structures are already
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| -there. New protocol modules contributions are welcome.
|
| -</p>
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| -
|
| -<p>
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| -And finally, the latest pyasn1 package revision is available for free
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| -download from
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| -<a href=http://sourceforge.net/projects/pyasn1/>project home</a> and
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| -also from the
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| -<a href=http://pypi.python.org/pypi>Python package repository</a>.
|
| -</p>
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| -
|
| -<hr>
|
| -
|
| -</td>
|
| -</tr>
|
| -</table>
|
| -</center>
|
| -</body>
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| -</html>
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|
|
Chromium Code Reviews
Issue 1493973002:
Remove telemetry/third_party/gsutilz (Closed)
Base URL: https://chromium.googlesource.com/chromium/src.git@gsutil_changes