1DGST(1) OpenSSL DGST(1)
2
6 dgst, sha, sha1, mdc2, ripemd160, sha224, sha256, sha384, sha512, md2,
7 md4, md5, dss1 - message digests
8
10 openssl dgst
11 [-sha|-sha1|-mdc2|-ripemd160|-sha224|-sha256|-sha384|-sha512|-md2|-md4|-md5|-dss1]
12 [-c] [-d] [-hex] [-binary] [-r] [-non-fips-allow] [-out filename]
13 [-sign filename] [-keyform arg] [-passin arg] [-verify filename]
14 [-prverify filename] [-signature filename] [-hmac key]
15 [-non-fips-allow] [-fips-fingerprint] [file...]
16 openssl [digest] [...]
18
20 The digest functions output the message digest of a supplied file or
21 files in hexadecimal. The digest functions also generate and verify
22 digital signatures using message digests.
23
25 -c print out the digest in two digit groups separated by colons, only
26 relevant if hex format output is used.
27 -d print out BIO debugging information.
29 -hex
31 digest is to be output as a hex dump. This is the default case for
32 a "normal" digest as opposed to a digital signature. See NOTES
33 below for digital signatures using -hex.
34 -binary
36 output the digest or signature in binary form.
37 -r output the digest in the "coreutils" format used by programs like
39 sha1sum.
40 -non-fips-allow
42 Allow use of non FIPS digest when in FIPS mode. This has no effect
43 when not in FIPS mode.
44 -out filename
46 filename to output to, or standard output by default.
47 -sign filename
49 digitally sign the digest using the private key in "filename".
50 -keyform arg
52 Specifies the key format to sign digest with. The DER, PEM, P12,
53 and ENGINE formats are supported.
54 -engine id
56 Use engine id for operations (including private key storage). This
57 engine is not used as source for digest algorithms, unless it is
58 also specified in the configuration file.
59 -sigopt nm:v
61 Pass options to the signature algorithm during sign or verify
62 operations. Names and values of these options are algorithm-
63 specific.
64 -passin arg
66 the private key password source. For more information about the
67 format of arg see the PASS PHRASE ARGUMENTS section in openssl(1).
68 -verify filename
70 verify the signature using the the public key in "filename". The
71 output is either "Verification OK" or "Verification Failure".
72 -prverify filename
74 verify the signature using the the private key in "filename".
75 -signature filename
77 the actual signature to verify.
78 -hmac key
80 create a hashed MAC using "key".
81 -mac alg
83 create MAC (keyed Message Authentication Code). The most popular
84 MAC algorithm is HMAC (hash-based MAC), but there are other MAC
85 algorithms which are not based on hash, for instance gost-mac
86 algorithm, supported by ccgost engine. MAC keys and other options
87 should be set via -macopt parameter.
88 -macopt nm:v
90 Passes options to MAC algorithm, specified by -mac key. Following
91 options are supported by both by HMAC and gost-mac:
92 key:string
94 Specifies MAC key as alphnumeric string (use if key contain
95 printable characters only). String length must conform to
96 any restrictions of the MAC algorithm for example exactly
97 32 chars for gost-mac.
98 hexkey:string
100 Specifies MAC key in hexadecimal form (two hex digits per
101 byte). Key length must conform to any restrictions of the
102 MAC algorithm for example exactly 32 chars for gost-mac.
103 -rand file(s)
105 a file or files containing random data used to seed the random
106 number generator, or an EGD socket (see RAND_egd(3)). Multiple
107 files can be specified separated by a OS-dependent character. The
108 separator is ; for MS-Windows, , for OpenVMS, and : for all others.
109 -non-fips-allow
111 enable use of non-FIPS algorithms such as MD5 even in FIPS mode.
112 -fips-fingerprint
114 compute HMAC using a specific key for certain OpenSSL-FIPS
115 operations.
116 file...
118 file or files to digest. If no files are specified then standard
119 input is used.
120
122 To create a hex-encoded message digest of a file:
123 openssl dgst -md5 -hex file.txt
124 To sign a file using SHA-256 with binary file output:
126 openssl dgst -sha256 -sign privatekey.pem -out signature.sign file.txt
127 To verify a signature:
129 openssl dgst -sha256 -verify publickey.pem \
130 -signature signature.sign \
131 file.txt
132
134 The digest of choice for all new applications is SHA1. Other digests
135 are however still widely used.
136 When signing a file, dgst will automatically determine the algorithm
138 (RSA, ECC, etc) to use for signing based on the private key's ASN.1
139 info. When verifying signatures, it only handles the RSA, DSA, or
140 ECDSA signature itself, not the related data to identify the signer and
141 algorithm used in formats such as x.509, CMS, and S/MIME.
142 A source of random numbers is required for certain signing algorithms,
144 in particular ECDSA and DSA.
145 The signing and verify options should only be used if a single file is
147 being signed or verified.
148 Hex signatures cannot be verified using openssl. Instead, use "xxd -r"
150 or similar program to transform the hex signature into a binary
151 signature prior to verification.
1521.0.2k 2017-01-26 DGST(1)