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<h3>Table of Contents</h3>
<ul class="link-list" role="directory">
<li><a href="#module-OpenSSL::ASN1-label-ASN.1+class+hierarchy">ASN.1 class hierarchy</a>
<li><a href="#module-OpenSSL::ASN1-label-Constructive">Constructive</a>
<li><a href="#module-OpenSSL::ASN1-label-ASN1-3A-3ASet+and+ASN1-3A-3ASequence">ASN1::Set and ASN1::Sequence</a>
<li><a href="#module-OpenSSL::ASN1-label-Primitive">Primitive</a>
<li><a href="#module-OpenSSL::ASN1-label-Possible+values+for+tagging">Possible values for <em>tagging</em></a>
<li><a href="#module-OpenSSL::ASN1-label-Possible+values+for+tag_class">Possible values for <em>tag_class</em></a>
<li><a href="#module-OpenSSL::ASN1-label-Tag+constants">Tag constants</a>
<li><a href="#module-OpenSSL::ASN1-label-UNIVERSAL_TAG_NAME+constant">UNIVERSAL_TAG_NAME constant</a>
<li><a href="#module-OpenSSL::ASN1-label-Example+usage">Example usage</a>
<li><a href="#module-OpenSSL::ASN1-label-Decoding+and+viewing+a+DER-encoded+file">Decoding and viewing a DER-encoded file</a>
<li><a href="#module-OpenSSL::ASN1-label-Creating+an+ASN.1+structure+and+DER-encoding+it">Creating an ASN.1 structure and DER-encoding it</a>
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<!-- Method Quickref -->
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<h3>Methods</h3>
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<li ><a href="#method-c-decode">::decode</a>
<li ><a href="#method-c-decode_all">::decode_all</a>
<li ><a href="#method-c-traverse">::traverse</a>
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<main role="main" aria-labelledby="module-OpenSSL::ASN1">
<h1 id="module-OpenSSL::ASN1" class="module">
module OpenSSL::ASN1
</h1>
<section class="description">
<p>Abstract Syntax Notation One (or ASN.1) is a notation syntax to describe data structures and is defined in ITU-T X.680. ASN.1 itself does not mandate any encoding or parsing rules, but usually ASN.1 data structures are encoded using the Distinguished Encoding Rules (DER) or less often the Basic Encoding Rules (BER) described in ITU-T X.690. DER and BER encodings are binary Tag-Length-Value (TLV) encodings that are quite concise compared to other popular data description formats such as XML, JSON etc. ASN.1 data structures are very common in cryptographic applications, e.g. X.509 public key certificates or certificate revocation lists (CRLs) are all defined in ASN.1 and DER-encoded. ASN.1, DER and BER are the building blocks of applied cryptography. The <a href="ASN1.html"><code>ASN1</code></a> module provides the necessary classes that allow generation of ASN.1 data structures and the methods to encode them using a DER encoding. The decode method allows parsing arbitrary BER-/DER-encoded data to a Ruby object that can then be modified and re-encoded at will.</p>
<h2 id="module-OpenSSL::ASN1-label-ASN.1+class+hierarchy">ASN.1 class hierarchy<span><a href="#module-OpenSSL::ASN1-label-ASN.1+class+hierarchy">¶</a> <a href="#top">↑</a></span></h2>
<p>The base class representing ASN.1 structures is <a href="ASN1/ASN1Data.html"><code>ASN1Data</code></a>. <a href="ASN1/ASN1Data.html"><code>ASN1Data</code></a> offers attributes to read and set the <em>tag</em>, the <em>tag_class</em> and finally the <em>value</em> of a particular ASN.1 item. Upon parsing, any tagged values (implicit or explicit) will be represented by <a href="ASN1/ASN1Data.html"><code>ASN1Data</code></a> instances because their “real type” can only be determined using out-of-band information from the ASN.1 type declaration. Since this information is normally known when encoding a type, all sub-classes of <a href="ASN1/ASN1Data.html"><code>ASN1Data</code></a> offer an additional attribute <em>tagging</em> that allows to encode a value implicitly (<code>:IMPLICIT</code>) or explicitly (<code>:EXPLICIT</code>).</p>
<h3 id="module-OpenSSL::ASN1-label-Constructive"><a href="ASN1/Constructive.html"><code>Constructive</code></a><span><a href="#module-OpenSSL::ASN1-label-Constructive">¶</a> <a href="#top">↑</a></span></h3>
<p><a href="ASN1/Constructive.html"><code>Constructive</code></a> is, as its name implies, the base class for all constructed encodings, i.e. those that consist of several values, opposed to “primitive” encodings with just one single value. The value of an <a href="ASN1/Constructive.html"><code>Constructive</code></a> is always an Array.</p>
<h4 id="module-OpenSSL::ASN1-label-ASN1-3A-3ASet+and+ASN1-3A-3ASequence">ASN1::Set and ASN1::Sequence<span><a href="#module-OpenSSL::ASN1-label-ASN1-3A-3ASet+and+ASN1-3A-3ASequence">¶</a> <a href="#top">↑</a></span></h4>
<p>The most common constructive encodings are SETs and SEQUENCEs, which is why there are two sub-classes of <a href="ASN1/Constructive.html"><code>Constructive</code></a> representing each of them.</p>
<h3 id="module-OpenSSL::ASN1-label-Primitive"><a href="ASN1/Primitive.html"><code>Primitive</code></a><span><a href="#module-OpenSSL::ASN1-label-Primitive">¶</a> <a href="#top">↑</a></span></h3>
<p>This is the super class of all primitive values. <a href="ASN1/Primitive.html"><code>Primitive</code></a> itself is not used when parsing ASN.1 data, all values are either instances of a corresponding sub-class of <a href="ASN1/Primitive.html"><code>Primitive</code></a> or they are instances of <a href="ASN1/ASN1Data.html"><code>ASN1Data</code></a> if the value was tagged implicitly or explicitly. Please cf. <a href="ASN1/Primitive.html"><code>Primitive</code></a> documentation for details on sub-classes and their respective mappings of ASN.1 data types to Ruby objects.</p>
<h2 id="module-OpenSSL::ASN1-label-Possible+values+for+tagging">Possible values for <em>tagging</em><span><a href="#module-OpenSSL::ASN1-label-Possible+values+for+tagging">¶</a> <a href="#top">↑</a></span></h2>
<p>When constructing an <a href="ASN1/ASN1Data.html"><code>ASN1Data</code></a> object the ASN.1 type definition may require certain elements to be either implicitly or explicitly tagged. This can be achieved by setting the <em>tagging</em> attribute manually for sub-classes of <a href="ASN1/ASN1Data.html"><code>ASN1Data</code></a>. Use the symbol <code>:IMPLICIT</code> for implicit tagging and <code>:EXPLICIT</code> if the element requires explicit tagging.</p>
<h2 id="module-OpenSSL::ASN1-label-Possible+values+for+tag_class">Possible values for <em>tag_class</em><span><a href="#module-OpenSSL::ASN1-label-Possible+values+for+tag_class">¶</a> <a href="#top">↑</a></span></h2>
<p>It is possible to create arbitrary <a href="ASN1/ASN1Data.html"><code>ASN1Data</code></a> objects that also support a PRIVATE or APPLICATION tag class. Possible values for the <em>tag_class</em> attribute are:</p>
<ul><li>
<p><code>:UNIVERSAL</code> (the default for untagged values)</p>
</li><li>
<p><code>:CONTEXT_SPECIFIC</code> (the default for tagged values)</p>
</li><li>
<p><code>:APPLICATION</code></p>
</li><li>
<p><code>:PRIVATE</code></p>
</li></ul>
<h2 id="module-OpenSSL::ASN1-label-Tag+constants">Tag constants<span><a href="#module-OpenSSL::ASN1-label-Tag+constants">¶</a> <a href="#top">↑</a></span></h2>
<p>There is a constant defined for each universal tag:</p>
<ul><li>
<p>OpenSSL::ASN1::EOC (0)</p>
</li><li>
<p>OpenSSL::ASN1::BOOLEAN (1)</p>
</li><li>
<p>OpenSSL::ASN1::INTEGER (2)</p>
</li><li>
<p>OpenSSL::ASN1::BIT_STRING (3)</p>
</li><li>
<p>OpenSSL::ASN1::OCTET_STRING (4)</p>
</li><li>
<p>OpenSSL::ASN1::NULL (5)</p>
</li><li>
<p>OpenSSL::ASN1::OBJECT (6)</p>
</li><li>
<p>OpenSSL::ASN1::ENUMERATED (10)</p>
</li><li>
<p>OpenSSL::ASN1::UTF8STRING (12)</p>
</li><li>
<p>OpenSSL::ASN1::SEQUENCE (16)</p>
</li><li>
<p>OpenSSL::ASN1::SET (17)</p>
</li><li>
<p>OpenSSL::ASN1::NUMERICSTRING (18)</p>
</li><li>
<p>OpenSSL::ASN1::PRINTABLESTRING (19)</p>
</li><li>
<p>OpenSSL::ASN1::T61STRING (20)</p>
</li><li>
<p>OpenSSL::ASN1::VIDEOTEXSTRING (21)</p>
</li><li>
<p>OpenSSL::ASN1::IA5STRING (22)</p>
</li><li>
<p>OpenSSL::ASN1::UTCTIME (23)</p>
</li><li>
<p>OpenSSL::ASN1::GENERALIZEDTIME (24)</p>
</li><li>
<p>OpenSSL::ASN1::GRAPHICSTRING (25)</p>
</li><li>
<p>OpenSSL::ASN1::ISO64STRING (26)</p>
</li><li>
<p>OpenSSL::ASN1::GENERALSTRING (27)</p>
</li><li>
<p>OpenSSL::ASN1::UNIVERSALSTRING (28)</p>
</li><li>
<p>OpenSSL::ASN1::BMPSTRING (30)</p>
</li></ul>
<h2 id="module-OpenSSL::ASN1-label-UNIVERSAL_TAG_NAME+constant"><a href="ASN1.html#UNIVERSAL_TAG_NAME"><code>UNIVERSAL_TAG_NAME</code></a> constant<span><a href="#module-OpenSSL::ASN1-label-UNIVERSAL_TAG_NAME+constant">¶</a> <a href="#top">↑</a></span></h2>
<p>An Array that stores the name of a given tag number. These names are the same as the name of the tag constant that is additionally defined, e.g. <a href="2">UNIVERSAL_TAG_NAME</a> = “INTEGER” and OpenSSL::ASN1::INTEGER = 2.</p>
<h2 id="module-OpenSSL::ASN1-label-Example+usage">Example usage<span><a href="#module-OpenSSL::ASN1-label-Example+usage">¶</a> <a href="#top">↑</a></span></h2>
<h3 id="module-OpenSSL::ASN1-label-Decoding+and+viewing+a+DER-encoded+file">Decoding and viewing a DER-encoded file<span><a href="#module-OpenSSL::ASN1-label-Decoding+and+viewing+a+DER-encoded+file">¶</a> <a href="#top">↑</a></span></h3>
<pre class="ruby"><span class="ruby-identifier">require</span> <span class="ruby-string">'openssl'</span>
<span class="ruby-identifier">require</span> <span class="ruby-string">'pp'</span>
<span class="ruby-identifier">der</span> = <span class="ruby-constant">File</span>.<span class="ruby-identifier">binread</span>(<span class="ruby-string">'data.der'</span>)
<span class="ruby-identifier">asn1</span> = <span class="ruby-constant">OpenSSL</span><span class="ruby-operator">::</span><span class="ruby-constant">ASN1</span>.<span class="ruby-identifier">decode</span>(<span class="ruby-identifier">der</span>)
<span class="ruby-identifier">pp</span> <span class="ruby-identifier">der</span>
</pre>
<h3 id="module-OpenSSL::ASN1-label-Creating+an+ASN.1+structure+and+DER-encoding+it">Creating an ASN.1 structure and DER-encoding it<span><a href="#module-OpenSSL::ASN1-label-Creating+an+ASN.1+structure+and+DER-encoding+it">¶</a> <a href="#top">↑</a></span></h3>
<pre class="ruby"><span class="ruby-identifier">require</span> <span class="ruby-string">'openssl'</span>
<span class="ruby-identifier">version</span> = <span class="ruby-constant">OpenSSL</span><span class="ruby-operator">::</span><span class="ruby-constant">ASN1</span><span class="ruby-operator">::</span><span class="ruby-constant">Integer</span>.<span class="ruby-identifier">new</span>(<span class="ruby-value">1</span>)
<span class="ruby-comment"># Explicitly 0-tagged implies context-specific tag class</span>
<span class="ruby-identifier">serial</span> = <span class="ruby-constant">OpenSSL</span><span class="ruby-operator">::</span><span class="ruby-constant">ASN1</span><span class="ruby-operator">::</span><span class="ruby-constant">Integer</span>.<span class="ruby-identifier">new</span>(<span class="ruby-value">12345</span>, <span class="ruby-value">0</span>, <span class="ruby-value">:EXPLICIT</span>, <span class="ruby-value">:CONTEXT_SPECIFIC</span>)
<span class="ruby-identifier">name</span> = <span class="ruby-constant">OpenSSL</span><span class="ruby-operator">::</span><span class="ruby-constant">ASN1</span><span class="ruby-operator">::</span><span class="ruby-constant">PrintableString</span>.<span class="ruby-identifier">new</span>(<span class="ruby-string">'Data 1'</span>)
<span class="ruby-identifier">sequence</span> = <span class="ruby-constant">OpenSSL</span><span class="ruby-operator">::</span><span class="ruby-constant">ASN1</span><span class="ruby-operator">::</span><span class="ruby-constant">Sequence</span>.<span class="ruby-identifier">new</span>( [ <span class="ruby-identifier">version</span>, <span class="ruby-identifier">serial</span>, <span class="ruby-identifier">name</span> ] )
<span class="ruby-identifier">der</span> = <span class="ruby-identifier">sequence</span>.<span class="ruby-identifier">to_der</span>
</pre>
</section>
<section id="5Buntitled-5D" class="documentation-section">
<section class="constants-list">
<header>
<h3>Constants</h3>
</header>
<dl>
<dt id="UNIVERSAL_TAG_NAME">UNIVERSAL_TAG_NAME
<dd><p>Array storing tag names at the tag’s index.</p>
</dl>
</section>
<section id="public-class-5Buntitled-5D-method-details" class="method-section">
<header>
<h3>Public Class Methods</h3>
</header>
<div id="method-c-decode" class="method-detail ">
<div class="method-heading">
<span class="method-callseq">
OpenSSL::ASN1.decode(der) → ASN1Data
</span>
<span class="method-click-advice">click to toggle source</span>
</div>
<div class="method-description">
<p>Decodes a BER- or DER-encoded value and creates an <a href="ASN1/ASN1Data.html"><code>ASN1Data</code></a> instance. <em>der</em> may be a String or any object that features a <code>.to_der</code> method transforming it into a BER-/DER-encoded String+</p>
<h2 id="method-c-decode-label-Example">Example<span><a href="#method-c-decode-label-Example">¶</a> <a href="#top">↑</a></span></h2>
<pre class="ruby"><span class="ruby-identifier">der</span> = <span class="ruby-constant">File</span>.<span class="ruby-identifier">binread</span>(<span class="ruby-string">'asn1data'</span>)
<span class="ruby-identifier">asn1</span> = <span class="ruby-constant">OpenSSL</span><span class="ruby-operator">::</span><span class="ruby-constant">ASN1</span>.<span class="ruby-identifier">decode</span>(<span class="ruby-identifier">der</span>)
</pre>
<div class="method-source-code" id="decode-source">
<pre>static VALUE
ossl_asn1_decode(VALUE self, VALUE obj)
{
VALUE ret;
unsigned char *p;
VALUE tmp;
long len, read = 0, offset = 0;
obj = ossl_to_der_if_possible(obj);
tmp = rb_str_new4(StringValue(obj));
p = (unsigned char *)RSTRING_PTR(tmp);
len = RSTRING_LEN(tmp);
ret = ossl_asn1_decode0(&p, len, &offset, 0, 0, &read);
RB_GC_GUARD(tmp);
int_ossl_decode_sanity_check(len, read, offset);
return ret;
}</pre>
</div>
</div>
</div>
<div id="method-c-decode_all" class="method-detail ">
<div class="method-heading">
<span class="method-callseq">
OpenSSL::ASN1.decode_all(der) → Array of ASN1Data
</span>
<span class="method-click-advice">click to toggle source</span>
</div>
<div class="method-description">
<p>Similar to decode with the difference that decode expects one distinct value represented in <em>der</em>. decode_all on the contrary decodes a sequence of sequential BER/DER values lined up in <em>der</em> and returns them as an array.</p>
<h2 id="method-c-decode_all-label-Example">Example<span><a href="#method-c-decode_all-label-Example">¶</a> <a href="#top">↑</a></span></h2>
<pre class="ruby"><span class="ruby-identifier">ders</span> = <span class="ruby-constant">File</span>.<span class="ruby-identifier">binread</span>(<span class="ruby-string">'asn1data_seq'</span>)
<span class="ruby-identifier">asn1_ary</span> = <span class="ruby-constant">OpenSSL</span><span class="ruby-operator">::</span><span class="ruby-constant">ASN1</span>.<span class="ruby-identifier">decode_all</span>(<span class="ruby-identifier">ders</span>)
</pre>
<div class="method-source-code" id="decode_all-source">
<pre>static VALUE
ossl_asn1_decode_all(VALUE self, VALUE obj)
{
VALUE ary, val;
unsigned char *p;
long len, tmp_len = 0, read = 0, offset = 0;
VALUE tmp;
obj = ossl_to_der_if_possible(obj);
tmp = rb_str_new4(StringValue(obj));
p = (unsigned char *)RSTRING_PTR(tmp);
len = RSTRING_LEN(tmp);
tmp_len = len;
ary = rb_ary_new();
while (tmp_len > 0) {
long tmp_read = 0;
val = ossl_asn1_decode0(&p, tmp_len, &offset, 0, 0, &tmp_read);
rb_ary_push(ary, val);
read += tmp_read;
tmp_len -= tmp_read;
}
RB_GC_GUARD(tmp);
int_ossl_decode_sanity_check(len, read, offset);
return ary;
}</pre>
</div>
</div>
</div>
<div id="method-c-traverse" class="method-detail ">
<div class="method-heading">
<span class="method-callseq">
OpenSSL::ASN1.traverse(asn1) → nil
</span>
<span class="method-click-advice">click to toggle source</span>
</div>
<div class="method-description">
<p>If a block is given, it prints out each of the elements encountered. Block parameters are (in that order):</p>
<ul><li>
<p>depth: The recursion depth, plus one with each constructed value being encountered (<a href="../Integer.html"><code>Integer</code></a>)</p>
</li><li>
<p>offset: Current byte offset (<a href="../Integer.html"><code>Integer</code></a>)</p>
</li><li>
<p>header length: Combined length in bytes of the Tag and Length headers. (<a href="../Integer.html"><code>Integer</code></a>)</p>
</li><li>
<p>length: The overall remaining length of the entire data (<a href="../Integer.html"><code>Integer</code></a>)</p>
</li><li>
<p>constructed: Whether this value is constructed or not (Boolean)</p>
</li><li>
<p>tag_class: Current tag class (Symbol)</p>
</li><li>
<p>tag: The current tag number (<a href="../Integer.html"><code>Integer</code></a>)</p>
</li></ul>
<h2 id="method-c-traverse-label-Example">Example<span><a href="#method-c-traverse-label-Example">¶</a> <a href="#top">↑</a></span></h2>
<pre class="ruby"><span class="ruby-identifier">der</span> = <span class="ruby-constant">File</span>.<span class="ruby-identifier">binread</span>(<span class="ruby-string">'asn1data.der'</span>)
<span class="ruby-constant">OpenSSL</span><span class="ruby-operator">::</span><span class="ruby-constant">ASN1</span>.<span class="ruby-identifier">traverse</span>(<span class="ruby-identifier">der</span>) <span class="ruby-keyword">do</span> <span class="ruby-operator">|</span> <span class="ruby-identifier">depth</span>, <span class="ruby-identifier">offset</span>, <span class="ruby-identifier">header_len</span>, <span class="ruby-identifier">length</span>, <span class="ruby-identifier">constructed</span>, <span class="ruby-identifier">tag_class</span>, <span class="ruby-identifier">tag</span><span class="ruby-operator">|</span>
<span class="ruby-identifier">puts</span> <span class="ruby-node">"Depth: #{depth} Offset: #{offset} Length: #{length}"</span>
<span class="ruby-identifier">puts</span> <span class="ruby-node">"Header length: #{header_len} Tag: #{tag} Tag class: #{tag_class} Constructed: #{constructed}"</span>
<span class="ruby-keyword">end</span>
</pre>
<div class="method-source-code" id="traverse-source">
<pre>static VALUE
ossl_asn1_traverse(VALUE self, VALUE obj)
{
unsigned char *p;
VALUE tmp;
long len, read = 0, offset = 0;
obj = ossl_to_der_if_possible(obj);
tmp = rb_str_new4(StringValue(obj));
p = (unsigned char *)RSTRING_PTR(tmp);
len = RSTRING_LEN(tmp);
ossl_asn1_decode0(&p, len, &offset, 0, 1, &read);
RB_GC_GUARD(tmp);
int_ossl_decode_sanity_check(len, read, offset);
return Qnil;
}</pre>
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