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124 .\" ========================================================================
125 .\"
126 .IX Title "ASN1PARSE 1"
127 .TH ASN1PARSE 1 "2014-04-07" "1.0.1g" "OpenSSL"
128 .\" For nroff, turn off justification. Always turn off hyphenation; it makes
129 .\" way too many mistakes in technical documents.
130 .if n .ad l
131 .nh
132 .SH "NAME"
133 asn1parse \- ASN.1 parsing tool
134 .SH "SYNOPSIS"
135 .IX Header "SYNOPSIS"
136 \&\fBopenssl\fR \fBasn1parse\fR
137 [\fB\-inform PEM|DER\fR]
138 [\fB\-in filename\fR]
139 [\fB\-out filename\fR]
140 [\fB\-noout\fR]
141 [\fB\-offset number\fR]
142 [\fB\-length number\fR]
143 [\fB\-i\fR]
144 [\fB\-oid filename\fR]
145 [\fB\-strparse offset\fR]
146 [\fB\-genstr string\fR]
147 [\fB\-genconf file\fR]
148 .SH "DESCRIPTION"
149 .IX Header "DESCRIPTION"
150 The \fBasn1parse\fR command is a diagnostic utility that can parse \s-1ASN\s0.1
151 structures. It can also be used to extract data from \s-1ASN\s0.1 formatted data.
152 .SH "OPTIONS"
153 .IX Header "OPTIONS"
154 .IP "\fB\-inform\fR \fBDER|PEM\fR" 4
155 .IX Item "-inform DER|PEM"
156 the input format. \fB\s-1DER\s0\fR is binary format and \fB\s-1PEM\s0\fR (the default) is base64
157 encoded.
158 .IP "\fB\-in filename\fR" 4
159 .IX Item "-in filename"
160 the input file, default is standard input
161 .IP "\fB\-out filename\fR" 4
162 .IX Item "-out filename"
163 output file to place the \s-1DER\s0 encoded data into. If this
164 option is not present then no data will be output. This is most useful when
165 combined with the \fB\-strparse\fR option.
166 .IP "\fB\-noout\fR" 4
167 .IX Item "-noout"
168 don't output the parsed version of the input file.
169 .IP "\fB\-offset number\fR" 4
170 .IX Item "-offset number"
171 starting offset to begin parsing, default is start of file.
172 .IP "\fB\-length number\fR" 4
173 .IX Item "-length number"
174 number of bytes to parse, default is until end of file.
175 .IP "\fB\-i\fR" 4
176 .IX Item "-i"
177 indents the output according to the \*(L"depth\*(R" of the structures.
178 .IP "\fB\-oid filename\fR" 4
179 .IX Item "-oid filename"
180 a file containing additional \s-1OBJECT\s0 IDENTIFIERs (OIDs). The format of this
181 file is described in the \s-1NOTES\s0 section below.
182 .IP "\fB\-strparse offset\fR" 4
183 .IX Item "-strparse offset"
184 parse the contents octets of the \s-1ASN\s0.1 object starting at \fBoffset\fR. This
185 option can be used multiple times to \*(L"drill down\*(R" into a nested structure.
186 .IP "\fB\-genstr string\fR, \fB\-genconf file\fR" 4
187 .IX Item "-genstr string, -genconf file"
188 generate encoded data based on \fBstring\fR, \fBfile\fR or both using
189 \&\fIASN1_generate_nconf\fR\|(3) format. If \fBfile\fR only is
190 present then the string is obtained from the default section using the name
191 \&\fBasn1\fR. The encoded data is passed through the \s-1ASN1\s0 parser and printed out as
192 though it came from a file, the contents can thus be examined and written to a
193 file using the \fBout\fR option.
194 .SS "\s-1OUTPUT\s0"
195 .IX Subsection "OUTPUT"
196 The output will typically contain lines like this:
197 .PP
198 .Vb 1
199 \& 0:d=0 hl=4 l= 681 cons: SEQUENCE
200 .Ve
201 .PP
202 \&.....
203 .PP
204 .Vb 10
205 \& 229:d=3 hl=3 l= 141 prim: BIT STRING
206 \& 373:d=2 hl=3 l= 162 cons: cont [ 3 ]
207 \& 376:d=3 hl=3 l= 159 cons: SEQUENCE
208 \& 379:d=4 hl=2 l= 29 cons: SEQUENCE
209 \& 381:d=5 hl=2 l= 3 prim: OBJECT :X509v3 Subject Key Identifier
210 \& 386:d=5 hl=2 l= 22 prim: OCTET STRING
211 \& 410:d=4 hl=2 l= 112 cons: SEQUENCE
212 \& 412:d=5 hl=2 l= 3 prim: OBJECT :X509v3 Authority Key Identifier
213 \& 417:d=5 hl=2 l= 105 prim: OCTET STRING
214 \& 524:d=4 hl=2 l= 12 cons: SEQUENCE
215 .Ve
216 .PP
217 \&.....
218 .PP
219 This example is part of a self signed certificate. Each line starts with the
220 offset in decimal. \fBd=XX\fR specifies the current depth. The depth is increased
221 within the scope of any \s-1SET\s0 or \s-1SEQUENCE\s0. \fBhl=XX\fR gives the header length
222 (tag and length octets) of the current type. \fBl=XX\fR gives the length of
223 the contents octets.
224 .PP
225 The \fB\-i\fR option can be used to make the output more readable.
226 .PP
227 Some knowledge of the \s-1ASN\s0.1 structure is needed to interpret the output.
228 .PP
229 In this example the \s-1BIT\s0 \s-1STRING\s0 at offset 229 is the certificate public key.
230 The contents octets of this will contain the public key information. This can
231 be examined using the option \fB\-strparse 229\fR to yield:
232 .PP
233 .Vb 3
234 \& 0:d=0 hl=3 l= 137 cons: SEQUENCE
235 \& 3:d=1 hl=3 l= 129 prim: INTEGER :E5D21E1F5C8D208EA7A2166C7FAF9F6BDF2059669C60876DDB70840F1A5AAFA59699FE471F379F1DD6A487E7D5409AB6A88D4A9746E24B91D8CF55DB3521015460C8EDE44EE8A4189F7A7BE77D6CD3A9AF2696F486855CF58BF0EDF2B4068058C7A947F52548DDF7E15E96B385F86422BEA9064A3EE9E1158A56E4A6F47E5897
236 \& 135:d=1 hl=2 l= 3 prim: INTEGER :010001
237 .Ve
238 .SH "NOTES"
239 .IX Header "NOTES"
240 If an \s-1OID\s0 is not part of OpenSSL's internal table it will be represented in
241 numerical form (for example 1.2.3.4). The file passed to the \fB\-oid\fR option
242 allows additional OIDs to be included. Each line consists of three columns,
243 the first column is the \s-1OID\s0 in numerical format and should be followed by white
244 space. The second column is the \*(L"short name\*(R" which is a single word followed
245 by white space. The final column is the rest of the line and is the
246 \&\*(L"long name\*(R". \fBasn1parse\fR displays the long name. Example:
247 .PP
248 \&\f(CW\*(C`1.2.3.4 shortName A long name\*(C'\fR
249 .SH "EXAMPLES"
250 .IX Header "EXAMPLES"
251 Parse a file:
252 .PP
253 .Vb 1
254 \& openssl asn1parse \-in file.pem
255 .Ve
256 .PP
257 Parse a \s-1DER\s0 file:
258 .PP
259 .Vb 1
260 \& openssl asn1parse \-inform DER \-in file.der
261 .Ve
262 .PP
263 Generate a simple UTF8String:
264 .PP
265 .Vb 1
266 \& openssl asn1parse \-genstr \*(AqUTF8:Hello World\*(Aq
267 .Ve
268 .PP
269 Generate and write out a UTF8String, don't print parsed output:
270 .PP
271 .Vb 1
272 \& openssl asn1parse \-genstr \*(AqUTF8:Hello World\*(Aq \-noout \-out utf8.der
273 .Ve
274 .PP
275 Generate using a config file:
276 .PP
277 .Vb 1
278 \& openssl asn1parse \-genconf asn1.cnf \-noout \-out asn1.der
279 .Ve
280 .PP
281 Example config file:
282 .PP
283 .Vb 1
284 \& asn1=SEQUENCE:seq_sect
285 \&
286 \& [seq_sect]
287 \&
288 \& field1=BOOL:TRUE
289 \& field2=EXP:0, UTF8:some random string
290 .Ve
291 .SH "BUGS"
292 .IX Header "BUGS"
293 There should be options to change the format of output lines. The output of some
294 \&\s-1ASN\s0.1 types is not well handled (if at all).
295 .SH "SEE ALSO"
296 .IX Header "SEE ALSO"
297 \&\fIASN1_generate_nconf\fR\|(3)