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.\&quot; ========================================================================
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.IX Title &quot;ASN1PARSE 1&quot;
.TH ASN1PARSE 1 &quot;2023-09-11&quot; &quot;1.1.1w&quot; &quot;OpenSSL&quot;
.\&quot; For nroff, turn off justification.  Always turn off hyphenation; it makes
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.nh
.SH &quot;NAME&quot;
openssl\-asn1parse, asn1parse \- ASN.1 parsing tool
.SH &quot;SYNOPSIS&quot;
.IX Header &quot;SYNOPSIS&quot;
\&amp;\fBopenssl\fR \fBasn1parse\fR
[\fB\-help\fR]
[\fB\-inform PEM|DER\fR]
[\fB\-in filename\fR]
[\fB\-out filename\fR]
[\fB\-noout\fR]
[\fB\-offset number\fR]
[\fB\-length number\fR]
[\fB\-i\fR]
[\fB\-oid filename\fR]
[\fB\-dump\fR]
[\fB\-dlimit num\fR]
[\fB\-strparse offset\fR]
[\fB\-genstr string\fR]
[\fB\-genconf file\fR]
[\fB\-strictpem\fR]
[\fB\-item name\fR]
.SH &quot;DESCRIPTION&quot;
.IX Header &quot;DESCRIPTION&quot;
The \fBasn1parse\fR command is a diagnostic utility that can parse \s-1ASN.1\s0
structures. It can also be used to extract data from \s-1ASN.1\s0 formatted data.
.SH &quot;OPTIONS&quot;
.IX Header &quot;OPTIONS&quot;
.IP &quot;\fB\-help\fR&quot; 4
.IX Item &quot;-help&quot;
Print out a usage message.
.IP &quot;\fB\-inform\fR \fBDER|PEM\fR&quot; 4
.IX Item &quot;-inform DER|PEM&quot;
The input format. \fB\s-1DER\s0\fR is binary format and \fB\s-1PEM\s0\fR (the default) is base64
encoded.
.IP &quot;\fB\-in filename\fR&quot; 4
.IX Item &quot;-in filename&quot;
The input file, default is standard input.
.IP &quot;\fB\-out filename\fR&quot; 4
.IX Item &quot;-out filename&quot;
Output file to place the \s-1DER\s0 encoded data into. If this
option is not present then no data will be output. This is most useful when
combined with the \fB\-strparse\fR option.
.IP &quot;\fB\-noout\fR&quot; 4
.IX Item &quot;-noout&quot;
Don't output the parsed version of the input file.
.IP &quot;\fB\-offset number\fR&quot; 4
.IX Item &quot;-offset number&quot;
Starting offset to begin parsing, default is start of file.
.IP &quot;\fB\-length number\fR&quot; 4
.IX Item &quot;-length number&quot;
Number of bytes to parse, default is until end of file.
.IP &quot;\fB\-i\fR&quot; 4
.IX Item &quot;-i&quot;
Indents the output according to the \*(L&quot;depth\*(R&quot; of the structures.
.IP &quot;\fB\-oid filename\fR&quot; 4
.IX Item &quot;-oid filename&quot;
A file containing additional \s-1OBJECT\s0 IDENTIFIERs (OIDs). The format of this
file is described in the \s-1NOTES\s0 section below.
.IP &quot;\fB\-dump\fR&quot; 4
.IX Item &quot;-dump&quot;
Dump unknown data in hex format.
.IP &quot;\fB\-dlimit num\fR&quot; 4
.IX Item &quot;-dlimit num&quot;
Like \fB\-dump\fR, but only the first \fBnum\fR bytes are output.
.IP &quot;\fB\-strparse offset\fR&quot; 4
.IX Item &quot;-strparse offset&quot;
Parse the contents octets of the \s-1ASN.1\s0 object starting at \fBoffset\fR. This
option can be used multiple times to \*(L&quot;drill down\*(R&quot; into a nested structure.
.IP &quot;\fB\-genstr string\fR, \fB\-genconf file\fR&quot; 4
.IX Item &quot;-genstr string, -genconf file&quot;
Generate encoded data based on \fBstring\fR, \fBfile\fR or both using
\&amp;\fIASN1_generate_nconf\fR\|(3) format. If \fBfile\fR only is
present then the string is obtained from the default section using the name
\&amp;\fBasn1\fR. The encoded data is passed through the \s-1ASN1\s0 parser and printed out as
though it came from a file, the contents can thus be examined and written to a
file using the \fBout\fR option.
.IP &quot;\fB\-strictpem\fR&quot; 4
.IX Item &quot;-strictpem&quot;
If this option is used then \fB\-inform\fR will be ignored. Without this option any
data in a \s-1PEM\s0 format input file will be treated as being base64 encoded and
processed whether it has the normal \s-1PEM BEGIN\s0 and \s-1END\s0 markers or not. This
option will ignore any data prior to the start of the \s-1BEGIN\s0 marker, or after an
\&amp;\s-1END\s0 marker in a \s-1PEM\s0 file.
.IP &quot;\fB\-item name\fR&quot; 4
.IX Item &quot;-item name&quot;
Attempt to decode and print the data as \fB\s-1ASN1_ITEM\s0 name\fR. This can be used to
print out the fields of any supported \s-1ASN.1\s0 structure if the type is known.
.SS &quot;Output&quot;
.IX Subsection &quot;Output&quot;
The output will typically contain lines like this:
.PP
.Vb 1
\&amp;  0:d=0  hl=4 l= 681 cons: SEQUENCE
.Ve
.PP
\&amp;.....
.PP
.Vb 10
\&amp;  229:d=3  hl=3 l= 141 prim: BIT STRING
\&amp;  373:d=2  hl=3 l= 162 cons: cont [ 3 ]
\&amp;  376:d=3  hl=3 l= 159 cons: SEQUENCE
\&amp;  379:d=4  hl=2 l=  29 cons: SEQUENCE
\&amp;  381:d=5  hl=2 l=   3 prim: OBJECT            :X509v3 Subject Key Identifier
\&amp;  386:d=5  hl=2 l=  22 prim: OCTET STRING
\&amp;  410:d=4  hl=2 l= 112 cons: SEQUENCE
\&amp;  412:d=5  hl=2 l=   3 prim: OBJECT            :X509v3 Authority Key Identifier
\&amp;  417:d=5  hl=2 l= 105 prim: OCTET STRING
\&amp;  524:d=4  hl=2 l=  12 cons: SEQUENCE
.Ve
.PP
\&amp;.....
.PP
This example is part of a self-signed certificate. Each line starts with the
offset in decimal. \fBd=XX\fR specifies the current depth. The depth is increased
within the scope of any \s-1SET\s0 or \s-1SEQUENCE. \s0\fBhl=XX\fR gives the header length
(tag and length octets) of the current type. \fBl=XX\fR gives the length of
the contents octets.
.PP
The \fB\-i\fR option can be used to make the output more readable.
.PP
Some knowledge of the \s-1ASN.1\s0 structure is needed to interpret the output.
.PP
In this example the \s-1BIT STRING\s0 at offset 229 is the certificate public key.
The contents octets of this will contain the public key information. This can
be examined using the option \fB\-strparse 229\fR to yield:
.PP
.Vb 3
\&amp;    0:d=0  hl=3 l= 137 cons: SEQUENCE
\&amp;    3:d=1  hl=3 l= 129 prim: INTEGER           :E5D21E1F5C8D208EA7A2166C7FAF9F6BDF2059669C60876DDB70840F1A5AAFA59699FE471F379F1DD6A487E7D5409AB6A88D4A9746E24B91D8CF55DB3521015460C8EDE44EE8A4189F7A7BE77D6CD3A9AF2696F486855CF58BF0EDF2B4068058C7A947F52548DDF7E15E96B385F86422BEA9064A3EE9E1158A56E4A6F47E5897
\&amp;  135:d=1  hl=2 l=   3 prim: INTEGER           :010001
.Ve
.SH &quot;NOTES&quot;
.IX Header &quot;NOTES&quot;
If an \s-1OID\s0 is not part of OpenSSL's internal table it will be represented in
numerical form (for example 1.2.3.4). The file passed to the \fB\-oid\fR option
allows additional OIDs to be included. Each line consists of three columns,
the first column is the \s-1OID\s0 in numerical format and should be followed by white
space. The second column is the \*(L&quot;short name\*(R&quot; which is a single word followed
by white space. The final column is the rest of the line and is the
\&amp;\*(L&quot;long name\*(R&quot;. \fBasn1parse\fR displays the long name. Example:
.PP
\&amp;\f(CW\*(C`1.2.3.4       shortName       A long name\*(C'\fR
.SH &quot;EXAMPLES&quot;
.IX Header &quot;EXAMPLES&quot;
Parse a file:
.PP
.Vb 1
\&amp; openssl asn1parse \-in file.pem
.Ve
.PP
Parse a \s-1DER\s0 file:
.PP
.Vb 1
\&amp; openssl asn1parse \-inform DER \-in file.der
.Ve
.PP
Generate a simple UTF8String:
.PP
.Vb 1
\&amp; openssl asn1parse \-genstr \*(AqUTF8:Hello World\*(Aq
.Ve
.PP
Generate and write out a UTF8String, don't print parsed output:
.PP
.Vb 1
\&amp; openssl asn1parse \-genstr \*(AqUTF8:Hello World\*(Aq \-noout \-out utf8.der
.Ve
.PP
Generate using a config file:
.PP
.Vb 1
\&amp; openssl asn1parse \-genconf asn1.cnf \-noout \-out asn1.der
.Ve
.PP
Example config file:
.PP
.Vb 1
\&amp; asn1=SEQUENCE:seq_sect
\&amp;
\&amp; [seq_sect]
\&amp;
\&amp; field1=BOOL:TRUE
\&amp; field2=EXP:0, UTF8:some random string
.Ve
.SH &quot;BUGS&quot;
.IX Header &quot;BUGS&quot;
There should be options to change the format of output lines. The output of some
\&amp;\s-1ASN.1\s0 types is not well handled (if at all).
.SH &quot;SEE ALSO&quot;
.IX Header &quot;SEE ALSO&quot;
\&amp;\fIASN1_generate_nconf\fR\|(3)
.SH &quot;COPYRIGHT&quot;
.IX Header &quot;COPYRIGHT&quot;
Copyright 2000\-2017 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the OpenSSL license (the \*(L&quot;License\*(R&quot;).  You may not use
this file except in compliance with the License.  You can obtain a copy
in the file \s-1LICENSE\s0 in the source distribution or at
&lt;https://www.openssl.org/source/license.html&gt;.
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