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asn1parse (1)
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    NAME

         asn1parse - ASN.1 parsing tool
    
    
    

    SYNOPSIS

         openssl asn1parse [-inform PEM|DER] [-in filename] [-out
         filename] [-noout] [-offset number] [-length number] [-i]
         [-oid filename] [-strparse offset]
    
    
    

    DESCRIPTION

         The asn1parse command is a diagnostic utility that can parse
         ASN.1 structures. It can also be used to extract data from
         ASN.1 formatted data.
    
    
    

    OPTIONS

         -inform DER|PEM
             the input format. DER is binary format and PEM (the
             default) is base64 encoded.
    
         -in filename
             the input file, default is standard input
    
         -out filename
             output file to place the DER encoded data into. If this
             option is not present then no data will be output. This
             is most useful when combined with the -strparse option.
    
         -noout
             don't output the parsed version of the input file.
    
         -offset number
             starting offset to begin parsing, default is start of
             file.
    
         -length number
             number of bytes to parse, default is until end of file.
    
         -i  indents the output according to the "depth" of the
             structures.
    
         -oid filename
             a file containing additional OBJECT IDENTIFIERs (OIDs).
             The format of this file is described in the NOTES
             section below.
    
         -strparse offset
             parse the contents octets of the ASN.1 object starting
             at offset. This option can be used multiple times to
             "drill down" into a nested structure.
    
    
    
         OUTPUT
    
         The output will typically contain lines like this:
    
           0:d=0  hl=4 l= 681 cons: SEQUENCE
    
         .....
    
           229:d=3  hl=3 l= 141 prim: BIT STRING
           373:d=2  hl=3 l= 162 cons: cont [ 3 ]
           376:d=3  hl=3 l= 159 cons: SEQUENCE
           379:d=4  hl=2 l=  29 cons: SEQUENCE
           381:d=5  hl=2 l=   3 prim: OBJECT            :X509v3 Subject Key Identifier
           386:d=5  hl=2 l=  22 prim: OCTET STRING
           410:d=4  hl=2 l= 112 cons: SEQUENCE
           412:d=5  hl=2 l=   3 prim: OBJECT            :X509v3 Authority Key Identifier
           417:d=5  hl=2 l= 105 prim: OCTET STRING
           524:d=4  hl=2 l=  12 cons: SEQUENCE
    
         .....
    
         This example is part of a self signed certificate. Each line
         starts with the offset in decimal. d=XX specifies the
         current depth. The depth is increased within the scope of
         any SET or SEQUENCE. hl=XX gives the header length (tag and
         length octets) of the current type. l=XX gives the length of
         the contents octets.
    
         The -i option can be used to make the output more readable.
    
         Some knowledge of the ASN.1 structure is needed to interpret
         the output.
    
         In this example the BIT STRING 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 -strparse 229 to yield:
    
             0:d=0  hl=3 l= 137 cons: SEQUENCE
             3:d=1  hl=3 l= 129 prim: INTEGER           :E5D21E1F5C8D208EA7A2166C7FAF9F6BDF2059669C60876DDB70840F1A5AAFA59699FE471F379F1DD6A487E7D5409AB6A88D4A9746E24B91D8CF55DB3521015460C8EDE44EE8A4189F7A7BE77D6CD3A9AF2696F486855CF58BF0EDF2B4068058C7A947F52548DDF7E15E96B385F86422BEA9064A3EE9E1158A56E4A6F47E5897
           135:d=1  hl=2 l=   3 prim: INTEGER           :010001
    
    
    
    

    NOTES

         If an OID 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 -oid option allows additional OIDs to be
         included. Each line consists of three columns, the first
         column is the OID in numerical format and should be followed
         by white space. The second column is the "short name" which
         is a single word followed by white space. The final column
         is the rest of the line and is the "long name". asn1parse
         displays the long name. Example:
    
         1.2.3.4   shortName A long name
    
    
    

    BUGS

         There should be options to change the format of input lines.
         The output of some ASN.1 types is not well handled (if at
         all).
    
    
    
    


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