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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" openssl\-dgst \- perform digest operations .SH "SYNOPSIS" .IX Header "SYNOPSIS" \&\fBopenssl\fR \fBdgst\fR|\fIdigest\fR [\fB\-\f(BIdigest\fB\fR] [\fB\-help\fR] [\fB\-c\fR] [\fB\-d\fR] [\fB\-debug\fR] [\fB\-list\fR] [\fB\-hex\fR] [\fB\-binary\fR] [\fB\-r\fR] [\fB\-out\fR \fIfilename\fR] [\fB\-sign\fR \fIfilename\fR] [\fB\-keyform\fR \fB\s-1DER\s0\fR|\fB\s-1PEM\s0\fR|\fBP12\fR|\fB\s-1ENGINE\s0\fR] [\fB\-passin\fR \fIarg\fR] [\fB\-verify\fR \fIfilename\fR] [\fB\-prverify\fR \fIfilename\fR] [\fB\-signature\fR \fIfilename\fR] [\fB\-sigopt\fR \fInm\fR:\fIv\fR] [\fB\-hmac\fR \fIkey\fR] [\fB\-mac\fR \fIalg\fR] [\fB\-macopt\fR \fInm\fR:\fIv\fR] [\fB\-fips\-fingerprint\fR] [\fB\-engine\fR \fIid\fR] [\fB\-engine_impl\fR \fIid\fR] [\fB\-rand\fR \fIfiles\fR] [\fB\-writerand\fR \fIfile\fR] [\fIfile\fR ...] .SH "DESCRIPTION" .IX Header "DESCRIPTION" This command output the message digest of a supplied file or files in hexadecimal, and also generates and verifies digital signatures using message digests. .PP The generic name, \fBopenssl dgst\fR, may be used with an option specifying the algorithm to be used. The default digest is \fBsha256\fR. A supported \fIdigest\fR name may also be used as the sub-command name. To see the list of supported algorithms, use \f(CW\*(C`openssl list \-digest\-commands\*(C'\fR .SH "OPTIONS" .IX Header "OPTIONS" .IP "\fB\-help\fR" 4 .IX Item "-help" Print out a usage message. .IP "\fB\-\f(BIdigest\fB\fR" 4 .IX Item "-digest" Specifies name of a supported digest to be used. To see the list of supported digests, use the command \f(CW\*(C`list \-\-digest\-commands\*(C'\fR. .IP "\fB\-c\fR" 4 .IX Item "-c" Print out the digest in two digit groups separated by colons, only relevant if the \fB\-hex\fR option is given as well. .IP "\fB\-d\fR, \fB\-debug\fR" 4 .IX Item "-d, -debug" Print out \s-1BIO\s0 debugging information. .IP "\fB\-list\fR" 4 .IX Item "-list" Prints out a list of supported message digests. .IP "\fB\-hex\fR" 4 .IX Item "-hex" Digest is to be output as a hex dump. This is the default case for a \*(L"normal\*(R" digest as opposed to a digital signature. See \s-1NOTES\s0 below for digital signatures using \fB\-hex\fR. .IP "\fB\-binary\fR" 4 .IX Item "-binary" Output the digest or signature in binary form. .IP "\fB\-r\fR" 4 .IX Item "-r" Output the digest in the \*(L"coreutils\*(R" format, including newlines. Used by programs like \fIsha1sum\fR\|(1). .IP "\fB\-out\fR \fIfilename\fR" 4 .IX Item "-out filename" Filename to output to, or standard output by default. .IP "\fB\-sign\fR \fIfilename\fR" 4 .IX Item "-sign filename" Digitally sign the digest using the private key in \*(L"filename\*(R". Note this option does not support Ed25519 or Ed448 private keys. Use the \fIopenssl\-pkeyutl\fR\|(1) command instead for this. .IP "\fB\-keyform\fR \fB\s-1DER\s0\fR|\fB\s-1PEM\s0\fR|\fBP12\fR|\fB\s-1ENGINE\s0\fR" 4 .IX Item "-keyform DER|PEM|P12|ENGINE" The format of the key to sign with; the default is \fB\s-1PEM\s0\fR. See \*(L"Format Options\*(R" in \fIopenssl\fR\|(1) for details. .IP "\fB\-sigopt\fR \fInm\fR:\fIv\fR" 4 .IX Item "-sigopt nm:v" Pass options to the signature algorithm during sign or verify operations. Names and values of these options are algorithm-specific. .IP "\fB\-passin\fR \fIarg\fR" 4 .IX Item "-passin arg" The private key password source. For more information about the format of \fIarg\fR see \*(L"Pass Phrase Options\*(R" in \fIopenssl\fR\|(1). .IP "\fB\-verify\fR \fIfilename\fR" 4 .IX Item "-verify filename" Verify the signature using the public key in \*(L"filename\*(R". The output is either \*(L"Verification \s-1OK\s0\*(R" or \*(L"Verification Failure\*(R". .IP "\fB\-prverify\fR \fIfilename\fR" 4 .IX Item "-prverify filename" Verify the signature using the private key in \*(L"filename\*(R". .IP "\fB\-signature\fR \fIfilename\fR" 4 .IX Item "-signature filename" The actual signature to verify. .IP "\fB\-hmac\fR \fIkey\fR" 4 .IX Item "-hmac key" Create a hashed \s-1MAC\s0 using \*(L"key\*(R". .Sp The \fIopenssl\-mac\fR\|(1) command should be preferred to using this command line option. .IP "\fB\-mac\fR \fIalg\fR" 4 .IX Item "-mac alg" Create \s-1MAC\s0 (keyed Message Authentication Code). The most popular \s-1MAC\s0 algorithm is \s-1HMAC\s0 (hash-based \s-1MAC\s0), but there are other \s-1MAC\s0 algorithms which are not based on hash, for instance \fBgost-mac\fR algorithm, supported by the \fBgost\fR engine. \s-1MAC\s0 keys and other options should be set via \fB\-macopt\fR parameter. .Sp The \fIopenssl\-mac\fR\|(1) command should be preferred to using this command line option. .IP "\fB\-macopt\fR \fInm\fR:\fIv\fR" 4 .IX Item "-macopt nm:v" Passes options to \s-1MAC\s0 algorithm, specified by \fB\-mac\fR key. Following options are supported by both by \fB\s-1HMAC\s0\fR and \fBgost-mac\fR: .RS 4 .IP "\fBkey\fR:\fIstring\fR" 4 .IX Item "key:string" Specifies \s-1MAC\s0 key as alphanumeric string (use if key contain printable characters only). String length must conform to any restrictions of the \s-1MAC\s0 algorithm for example exactly 32 chars for gost-mac. .IP "\fBhexkey\fR:\fIstring\fR" 4 .IX Item "hexkey:string" Specifies \s-1MAC\s0 key in hexadecimal form (two hex digits per byte). Key length must conform to any restrictions of the \s-1MAC\s0 algorithm for example exactly 32 chars for gost-mac. .RE .RS 4 .Sp The \fIopenssl\-mac\fR\|(1) command should be preferred to using this command line option. .RE .IP "\fB\-fips\-fingerprint\fR" 4 .IX Item "-fips-fingerprint" Compute \s-1HMAC\s0 using a specific key for certain OpenSSL-FIPS operations. .IP "\fB\-rand\fR \fIfiles\fR, \fB\-writerand\fR \fIfile\fR" 4 .IX Item "-rand files, -writerand file" See \*(L"Random State Options\*(R" in \fIopenssl\fR\|(1) for details. .IP "\fB\-engine\fR \fIid\fR" 4 .IX Item "-engine id" See \*(L"Engine Options\*(R" in \fIopenssl\fR\|(1). The engine is not used for digests unless the \fB\-engine_impl\fR option is used or it is configured to do so, see \*(L"Engine Configuration Module\*(R" in \fIconfig\fR\|(5). .IP "\fB\-engine_impl\fR \fIid\fR" 4 .IX Item "-engine_impl id" When used with the \fB\-engine\fR option, it specifies to also use engine \fIid\fR for digest operations. .IP "\fIfile\fR ..." 4 .IX Item "file ..." File or files to digest. If no files are specified then standard input is used. .SH "EXAMPLES" .IX Header "EXAMPLES" To create a hex-encoded message digest of a file: openssl dgst \-md5 \-hex file.txt .PP To sign a file using \s-1SHA\-256\s0 with binary file output: openssl dgst \-sha256 \-sign privatekey.pem \-out signature.sign file.txt .PP To verify a signature: openssl dgst \-sha256 \-verify publickey.pem \e \-signature signature.sign \e file.txt .SH "NOTES" .IX Header "NOTES" The digest mechanisms that are available will depend on the options used when building OpenSSL. The \f(CW\*(C`openssl list \-digest\-commands\*(C'\fR command can be used to list them. .PP New or agile applications should use probably use \s-1SHA\-256\s0. Other digests, particularly \s-1SHA\-1\s0 and \s-1MD5\s0, are still widely used for interoperating with existing formats and protocols. .PP When signing a file, this command will automatically determine the algorithm (\s-1RSA\s0, \s-1ECC\s0, etc) to use for signing based on the private key's \s-1ASN\s0.1 info. When verifying signatures, it only handles the \s-1RSA\s0, \s-1DSA\s0, or \s-1ECDSA\s0 signature itself, not the related data to identify the signer and algorithm used in formats such as x.509, \s-1CMS\s0, and S/MIME. .PP A source of random numbers is required for certain signing algorithms, in particular \s-1ECDSA\s0 and \s-1DSA\s0. .PP The signing and verify options should only be used if a single file is being signed or verified. .PP Hex signatures cannot be verified using \fBopenssl\fR. Instead, use \*(L"xxd \-r\*(R" or similar program to transform the hex signature into a binary signature prior to verification. .PP The \fIopenssl\-mac\fR\|(1) command is preferred over the \fB\-hmac\fR, \fB\-mac\fR and \&\fB\-macopt\fR command line options. .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fIopenssl\-mac\fR\|(1) .SH "HISTORY" .IX Header "HISTORY" The default digest was changed from \s-1MD5\s0 to \s-1SHA256\s0 in OpenSSL 1.1.0. The FIPS-related options were removed in OpenSSL 1.1.0. .SH "COPYRIGHT" .IX Header "COPYRIGHT" Copyright 2000\-2019 The OpenSSL Project Authors. All Rights Reserved. .PP Licensed under the Apache License 2.0 (the \*(L"License\*(R"). You may not use this file except in compliance with the License. You can obtain a copy in the file \s-1LICENSE\s0 in the source distribution or at .