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


           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


           -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.
               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.
           -genstr string, -genconf file
               generate encoded data based on string, file or both using
               ASN1_generate_nconf(3) format. If file only is present then the
               string is obtained from the default section using the name asn1.
               The encoded data is passed through the ASN1 parser and printed out
               as though it came from a file, the contents can thus be examined
               and written to a file using the out option.
             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
           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
               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


           If an OID is not part of OpenSSL's internal table it will be
           represented in numerical form (for example 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:
           "  shortName A long name"


           Parse a file:
            openssl asn1parse -in file.pem
           Parse a DER file:
            openssl asn1parse -inform DER -in file.der
           Generate a simple UTF8String:
            openssl asn1parse -genstr 'UTF8:Hello World'
           Generate and write out a UTF8String, don't print parsed output:


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



    1.0.1e 2013-02-11 ASN1PARSE(1)


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