mirror of
https://github.com/openssl/openssl.git
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214 lines
5.5 KiB
Plaintext
214 lines
5.5 KiB
Plaintext
=pod
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=head1 NAME
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dgst, sha, sha1, mdc2, ripemd160, sha224, sha256, sha384, sha512, md4, md5 - message digests
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=head1 SYNOPSIS
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B<openssl> B<dgst>
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[B<-sha|-sha1|-mdc2|-ripemd160|-sha224|-sha256|-sha384|-sha512|-md4|-md5>]
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[B<-c>]
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[B<-d>]
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[B<-hex>]
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[B<-binary>]
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[B<-r>]
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[B<-out filename>]
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[B<-sign filename>]
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[B<-keyform arg>]
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[B<-passin arg>]
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[B<-verify filename>]
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[B<-prverify filename>]
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[B<-signature filename>]
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[B<-hmac key>]
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[B<-fips-fingerprint>]
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[B<file...>]
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B<openssl>
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[I<digest>]
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[B<...>]
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=head1 DESCRIPTION
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The digest functions output the message digest of a supplied file or files
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in hexadecimal. The digest functions also generate and verify digital
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signatures using message digests.
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The generic name, B<dgst>, may be used with an option specifying the
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algorithm to be used.
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The default digest is I<sha256>.
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The digest name may also be used as the command name.
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To see the list of supported algorithms, use the <Ilist --digest-commands>
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command.
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=head1 OPTIONS
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=over 4
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=item B<-c>
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print out the digest in two digit groups separated by colons, only relevant if
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B<hex> format output is used.
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=item B<-d>
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print out BIO debugging information.
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=item B<-hex>
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digest is to be output as a hex dump. This is the default case for a "normal"
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digest as opposed to a digital signature. See NOTES below for digital
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signatures using B<-hex>.
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=item B<-binary>
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output the digest or signature in binary form.
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=item B<-r>
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output the digest in the "coreutils" format used by programs like B<sha1sum>.
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=item B<-out filename>
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filename to output to, or standard output by default.
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=item B<-sign filename>
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digitally sign the digest using the private key in "filename".
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=item B<-keyform arg>
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Specifies the key format to sign digest with. The DER, PEM, P12,
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and ENGINE formats are supported.
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=item B<-engine id>
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Use engine B<id> for operations (including private key storage).
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This engine is not used as source for digest algorithms, unless it is
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also specified in the configuration file.
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=item B<-sigopt nm:v>
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Pass options to the signature algorithm during sign or verify operations.
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Names and values of these options are algorithm-specific.
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=item B<-passin arg>
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the private key password source. For more information about the format of B<arg>
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see the B<PASS PHRASE ARGUMENTS> section in L<openssl(1)>.
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=item B<-verify filename>
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verify the signature using the the public key in "filename".
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The output is either "Verification OK" or "Verification Failure".
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=item B<-prverify filename>
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verify the signature using the the private key in "filename".
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=item B<-signature filename>
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the actual signature to verify.
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=item B<-hmac key>
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create a hashed MAC using "key".
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=item B<-mac alg>
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create MAC (keyed Message Authentication Code). The most popular MAC
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algorithm is HMAC (hash-based MAC), but there are other MAC algorithms
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which are not based on hash, for instance B<gost-mac> algorithm,
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supported by B<ccgost> engine. MAC keys and other options should be set
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via B<-macopt> parameter.
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=item B<-macopt nm:v>
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Passes options to MAC algorithm, specified by B<-mac> key.
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Following options are supported by both by B<HMAC> and B<gost-mac>:
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=over 8
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=item B<key:string>
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Specifies MAC key as alphanumeric string (use if key contain printable
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characters only). String length must conform to any restrictions of
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the MAC algorithm for example exactly 32 chars for gost-mac.
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=item B<hexkey:string>
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Specifies MAC key in hexadecimal form (two hex digits per byte).
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Key length must conform to any restrictions of the MAC algorithm
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for example exactly 32 chars for gost-mac.
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=back
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=item B<-rand file(s)>
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a file or files containing random data used to seed the random number
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generator, or an EGD socket (see L<RAND_egd(3)>).
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Multiple files can be specified separated by a OS-dependent character.
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The separator is B<;> for MS-Windows, B<,> for OpenVMS, and B<:> for
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all others.
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=item B<-fips-fingerprint>
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compute HMAC using a specific key
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for certain OpenSSL-FIPS operations.
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=item B<file...>
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file or files to digest. If no files are specified then standard input is
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used.
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=back
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=head1 EXAMPLES
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To create a hex-encoded message digest of a file:
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openssl dgst -md5 -hex file.txt
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To sign a file using SHA-256 with binary file output:
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openssl dgst -sha256 -sign privatekey.pem -out signature.sign file.txt
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To verify a signature:
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openssl dgst -sha256 -verify publickey.pem \
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-signature signature.sign \
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file.txt
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=head1 NOTES
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The digest mechanisms that are available will depend on the options
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used when building OpenSSL.
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The B<list digest-commands> command can be used to list them.
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New or agile applications should use probably use SHA-256. Other digests,
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particularly SHA-1 and MD5, are still widely used for interoperating
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with existing formats and protocols.
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When signing a file, B<dgst> will automatically determine the algorithm
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(RSA, ECC, etc) to use for signing based on the private key's ASN.1 info.
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When verifying signatures, it only handles the RSA, DSA, or ECDSA signature
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itself, not the related data to identify the signer and algorithm used in
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formats such as x.509, CMS, and S/MIME.
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A source of random numbers is required for certain signing algorithms, in
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particular ECDSA and DSA.
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The signing and verify options should only be used if a single file is
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being signed or verified.
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Hex signatures cannot be verified using B<openssl>. Instead, use "xxd -r"
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or similar program to transform the hex signature into a binary signature
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prior to verification.
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=head1 HISTORY
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The default digest was changed from MD5 to SHA256 in Openssl 1.1.
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The FIPS-related options were removed in OpenSSL 1.1
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=cut
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