2 {- OpenSSL::safe::output_do_not_edit_headers(); -}
6 openssl-dgst - perform digest operations
10 B<openssl> B<dgst>|I<digest>
21 [B<-sign> I<filename>]
22 [B<-keyform> B<DER>|B<PEM>|B<P12>|B<ENGINE>]
24 [B<-verify> I<filename>]
25 [B<-prverify> I<filename>]
26 [B<-signature> I<filename>]
27 [B<-sigopt> I<nm>:I<v>]
30 [B<-macopt> I<nm>:I<v>]
31 [B<-fips-fingerprint>]
32 {- $OpenSSL::safe::opt_engine_synopsis -}{- output_off() if $disabled{"deprecated-3.0"}; ""
33 -}[B<-engine_impl> I<id>]{-
34 output_on() if $disabled{"deprecated-3.0"}; "" -}
35 {- $OpenSSL::safe::opt_r_synopsis -}
36 {- $OpenSSL::safe::opt_provider_synopsis -}
41 This command output the message digest of a supplied file or files
42 in hexadecimal, and also generates and verifies digital
43 signatures using message digests.
45 The generic name, B<openssl dgst>, may be used with an option specifying the
47 The default digest is B<sha256>.
48 A supported I<digest> name may also be used as the sub-command name.
49 To see the list of supported algorithms, use C<openssl list -digest-commands>
57 Print out a usage message.
61 Specifies name of a supported digest to be used. To see the list of
62 supported digests, use the command C<list --digest-commands>.
66 Print out the digest in two digit groups separated by colons, only relevant if
67 the B<-hex> option is given as well.
69 =item B<-d>, B<-debug>
71 Print out BIO debugging information.
75 Prints out a list of supported message digests.
79 Digest is to be output as a hex dump. This is the default case for a "normal"
80 digest as opposed to a digital signature. See NOTES below for digital
81 signatures using B<-hex>.
85 Output the digest or signature in binary form.
89 =for openssl foreign manual sha1sum(1)
91 Output the digest in the "coreutils" format, including newlines.
92 Used by programs like L<sha1sum(1)>.
94 =item B<-out> I<filename>
96 Filename to output to, or standard output by default.
98 =item B<-sign> I<filename>
100 Digitally sign the digest using the private key in "filename". Note this option
101 does not support Ed25519 or Ed448 private keys. Use the L<openssl-pkeyutl(1)>
102 command instead for this.
104 =item B<-keyform> B<DER>|B<PEM>|B<P12>|B<ENGINE>
106 The format of the key to sign with; the default is B<PEM>.
107 The only value with effect is B<ENGINE>; all others have become obsolete.
108 See L<openssl(1)/Format Options> for details.
110 =item B<-sigopt> I<nm>:I<v>
112 Pass options to the signature algorithm during sign or verify operations.
113 Names and values of these options are algorithm-specific.
115 =item B<-passin> I<arg>
117 The private key password source. For more information about the format of I<arg>
118 see L<openssl(1)/Pass Phrase Options>.
120 =item B<-verify> I<filename>
122 Verify the signature using the public key in "filename".
123 The output is either "Verification OK" or "Verification Failure".
125 =item B<-prverify> I<filename>
127 Verify the signature using the private key in "filename".
129 =item B<-signature> I<filename>
131 The actual signature to verify.
133 =item B<-hmac> I<key>
135 Create a hashed MAC using "key".
137 The L<openssl-mac(1)> command should be preferred to using this command line
142 Create MAC (keyed Message Authentication Code). The most popular MAC
143 algorithm is HMAC (hash-based MAC), but there are other MAC algorithms
144 which are not based on hash, for instance B<gost-mac> algorithm,
145 supported by the B<gost> engine. MAC keys and other options should be set
146 via B<-macopt> parameter.
148 The L<openssl-mac(1)> command should be preferred to using this command line
151 =item B<-macopt> I<nm>:I<v>
153 Passes options to MAC algorithm, specified by B<-mac> key.
154 Following options are supported by both by B<HMAC> and B<gost-mac>:
158 =item B<key>:I<string>
160 Specifies MAC key as alphanumeric string (use if key contain printable
161 characters only). String length must conform to any restrictions of
162 the MAC algorithm for example exactly 32 chars for gost-mac.
164 =item B<hexkey>:I<string>
166 Specifies MAC key in hexadecimal form (two hex digits per byte).
167 Key length must conform to any restrictions of the MAC algorithm
168 for example exactly 32 chars for gost-mac.
172 The L<openssl-mac(1)> command should be preferred to using this command line
175 =item B<-fips-fingerprint>
177 Compute HMAC using a specific key for certain OpenSSL-FIPS operations.
179 {- $OpenSSL::safe::opt_r_item -}
181 {- $OpenSSL::safe::opt_engine_item -}
182 {- output_off() if $disabled{"deprecated-3.0"}; "" -}
183 The engine is not used for digests unless the B<-engine_impl> option is
184 used or it is configured to do so, see L<config(5)/Engine Configuration Module>.
186 =item B<-engine_impl> I<id>
188 When used with the B<-engine> option, it specifies to also use
189 engine I<id> for digest operations.
191 {- output_on() if $disabled{"deprecated-3.0"}; "" -}
192 {- $OpenSSL::safe::opt_provider_item -}
196 File or files to digest. If no files are specified then standard input is
204 To create a hex-encoded message digest of a file:
205 openssl dgst -md5 -hex file.txt
207 To sign a file using SHA-256 with binary file output:
208 openssl dgst -sha256 -sign privatekey.pem -out signature.sign file.txt
210 To verify a signature:
211 openssl dgst -sha256 -verify publickey.pem \
212 -signature signature.sign \
218 The digest mechanisms that are available will depend on the options
219 used when building OpenSSL.
220 The C<openssl list -digest-commands> command can be used to list them.
222 New or agile applications should use probably use SHA-256. Other digests,
223 particularly SHA-1 and MD5, are still widely used for interoperating
224 with existing formats and protocols.
226 When signing a file, this command will automatically determine the algorithm
227 (RSA, ECC, etc) to use for signing based on the private key's ASN.1 info.
228 When verifying signatures, it only handles the RSA, DSA, or ECDSA signature
229 itself, not the related data to identify the signer and algorithm used in
230 formats such as x.509, CMS, and S/MIME.
232 A source of random numbers is required for certain signing algorithms, in
233 particular ECDSA and DSA.
235 The signing and verify options should only be used if a single file is
236 being signed or verified.
238 Hex signatures cannot be verified using B<openssl>. Instead, use "xxd -r"
239 or similar program to transform the hex signature into a binary signature
240 prior to verification.
242 The L<openssl-mac(1)> command is preferred over the B<-hmac>, B<-mac> and
243 B<-macopt> command line options.
251 The default digest was changed from MD5 to SHA256 in OpenSSL 1.1.0.
252 The FIPS-related options were removed in OpenSSL 1.1.0.
254 All B<-keyform> values except B<ENGINE> have become obsolete in OpenSSL 3.0.0
257 The B<-engine> and B<-engine_impl> options were deprecated in OpenSSL 3.0.
261 Copyright 2000-2020 The OpenSSL Project Authors. All Rights Reserved.
263 Licensed under the Apache License 2.0 (the "License"). You may not use
264 this file except in compliance with the License. You can obtain a copy
265 in the file LICENSE in the source distribution or at
266 L<https://www.openssl.org/source/license.html>.