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129 .\" ========================================================================
131 .IX Title "ASN1PARSE 1"
132 .TH ASN1PARSE 1 "2018-08-14" "1.0.2p" "OpenSSL"
133 .\" For nroff, turn off justification. Always turn off hyphenation; it makes
134 .\" way too many mistakes in technical documents.
139 asn1parse \- ASN.1 parsing tool
141 .IX Header "SYNOPSIS"
142 \&\fBopenssl\fR \fBasn1parse\fR
143 [\fB\-inform PEM|DER\fR]
144 [\fB\-in filename\fR]
145 [\fB\-out filename\fR]
147 [\fB\-offset number\fR]
148 [\fB\-length number\fR]
150 [\fB\-oid filename\fR]
153 [\fB\-strparse offset\fR]
154 [\fB\-genstr string\fR]
155 [\fB\-genconf file\fR]
157 .IX Header "DESCRIPTION"
158 The \fBasn1parse\fR command is a diagnostic utility that can parse \s-1ASN.1\s0
159 structures. It can also be used to extract data from \s-1ASN.1\s0 formatted data.
162 .IP "\fB\-inform\fR \fBDER|PEM\fR" 4
163 .IX Item "-inform DER|PEM"
164 the input format. \fB\s-1DER\s0\fR is binary format and \fB\s-1PEM\s0\fR (the default) is base64
166 .IP "\fB\-in filename\fR" 4
167 .IX Item "-in filename"
168 the input file, default is standard input
169 .IP "\fB\-out filename\fR" 4
170 .IX Item "-out filename"
171 output file to place the \s-1DER\s0 encoded data into. If this
172 option is not present then no data will be output. This is most useful when
173 combined with the \fB\-strparse\fR option.
174 .IP "\fB\-noout\fR" 4
176 don't output the parsed version of the input file.
177 .IP "\fB\-offset number\fR" 4
178 .IX Item "-offset number"
179 starting offset to begin parsing, default is start of file.
180 .IP "\fB\-length number\fR" 4
181 .IX Item "-length number"
182 number of bytes to parse, default is until end of file.
185 indents the output according to the \*(L"depth\*(R" of the structures.
186 .IP "\fB\-oid filename\fR" 4
187 .IX Item "-oid filename"
188 a file containing additional \s-1OBJECT\s0 IDENTIFIERs (OIDs). The format of this
189 file is described in the \s-1NOTES\s0 section below.
192 dump unknown data in hex format.
193 .IP "\fB\-dlimit num\fR" 4
194 .IX Item "-dlimit num"
195 like \fB\-dump\fR, but only the first \fBnum\fR bytes are output.
196 .IP "\fB\-strparse offset\fR" 4
197 .IX Item "-strparse offset"
198 parse the contents octets of the \s-1ASN.1\s0 object starting at \fBoffset\fR. This
199 option can be used multiple times to \*(L"drill down\*(R" into a nested structure.
200 .IP "\fB\-genstr string\fR, \fB\-genconf file\fR" 4
201 .IX Item "-genstr string, -genconf file"
202 generate encoded data based on \fBstring\fR, \fBfile\fR or both using
203 \&\fIASN1_generate_nconf\fR\|(3) format. If \fBfile\fR only is
204 present then the string is obtained from the default section using the name
205 \&\fBasn1\fR. The encoded data is passed through the \s-1ASN1\s0 parser and printed out as
206 though it came from a file, the contents can thus be examined and written to a
207 file using the \fBout\fR option.
209 .IX Subsection "OUTPUT"
210 The output will typically contain lines like this:
213 \& 0:d=0 hl=4 l= 681 cons: SEQUENCE
219 \& 229:d=3 hl=3 l= 141 prim: BIT STRING
220 \& 373:d=2 hl=3 l= 162 cons: cont [ 3 ]
221 \& 376:d=3 hl=3 l= 159 cons: SEQUENCE
222 \& 379:d=4 hl=2 l= 29 cons: SEQUENCE
223 \& 381:d=5 hl=2 l= 3 prim: OBJECT :X509v3 Subject Key Identifier
224 \& 386:d=5 hl=2 l= 22 prim: OCTET STRING
225 \& 410:d=4 hl=2 l= 112 cons: SEQUENCE
226 \& 412:d=5 hl=2 l= 3 prim: OBJECT :X509v3 Authority Key Identifier
227 \& 417:d=5 hl=2 l= 105 prim: OCTET STRING
228 \& 524:d=4 hl=2 l= 12 cons: SEQUENCE
233 This example is part of a self signed certificate. Each line starts with the
234 offset in decimal. \fBd=XX\fR specifies the current depth. The depth is increased
235 within the scope of any \s-1SET\s0 or \s-1SEQUENCE.\s0 \fBhl=XX\fR gives the header length
236 (tag and length octets) of the current type. \fBl=XX\fR gives the length of
239 The \fB\-i\fR option can be used to make the output more readable.
241 Some knowledge of the \s-1ASN.1\s0 structure is needed to interpret the output.
243 In this example the \s-1BIT STRING\s0 at offset 229 is the certificate public key.
244 The contents octets of this will contain the public key information. This can
245 be examined using the option \fB\-strparse 229\fR to yield:
248 \& 0:d=0 hl=3 l= 137 cons: SEQUENCE
249 \& 3:d=1 hl=3 l= 129 prim: INTEGER :E5D21E1F5C8D208EA7A2166C7FAF9F6BDF2059669C60876DDB70840F1A5AAFA59699FE471F379F1DD6A487E7D5409AB6A88D4A9746E24B91D8CF55DB3521015460C8EDE44EE8A4189F7A7BE77D6CD3A9AF2696F486855CF58BF0EDF2B4068058C7A947F52548DDF7E15E96B385F86422BEA9064A3EE9E1158A56E4A6F47E5897
250 \& 135:d=1 hl=2 l= 3 prim: INTEGER :010001
254 If an \s-1OID\s0 is not part of OpenSSL's internal table it will be represented in
255 numerical form (for example 1.2.3.4). The file passed to the \fB\-oid\fR option
256 allows additional OIDs to be included. Each line consists of three columns,
257 the first column is the \s-1OID\s0 in numerical format and should be followed by white
258 space. The second column is the \*(L"short name\*(R" which is a single word followed
259 by white space. The final column is the rest of the line and is the
260 \&\*(L"long name\*(R". \fBasn1parse\fR displays the long name. Example:
262 \&\f(CW\*(C`1.2.3.4 shortName A long name\*(C'\fR
264 .IX Header "EXAMPLES"
268 \& openssl asn1parse \-in file.pem
271 Parse a \s-1DER\s0 file:
274 \& openssl asn1parse \-inform DER \-in file.der
277 Generate a simple UTF8String:
280 \& openssl asn1parse \-genstr \*(AqUTF8:Hello World\*(Aq
283 Generate and write out a UTF8String, don't print parsed output:
286 \& openssl asn1parse \-genstr \*(AqUTF8:Hello World\*(Aq \-noout \-out utf8.der
289 Generate using a config file:
292 \& openssl asn1parse \-genconf asn1.cnf \-noout \-out asn1.der
298 \& asn1=SEQUENCE:seq_sect
303 \& field2=EXP:0, UTF8:some random string
307 There should be options to change the format of output lines. The output of some
308 \&\s-1ASN.1\s0 types is not well handled (if at all).
310 .IX Header "SEE ALSO"
311 \&\fIASN1_generate_nconf\fR\|(3)