.\" generated with Ronn/v0.7.3
.\" http://github.com/rtomayko/ronn/tree/0.7.3
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.TH "MINISIGN" "1" "May 2020" "" ""
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.SH "NAME"
\fBminisign\fR \- A dead simple tool to sign files and verify signatures\.
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.SH "SYNOPSIS"
\fBminisign\fR \-G [\-p pubkey] [\-s seckey]
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.P
\fBminisign\fR \-S [\-H] [\-x sigfile] [\-s seckey] [\-c untrusted_comment] [\-t trusted_comment] \-m file [file \.\.\.]
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.P
\fBminisign\fR \-V [\-x sigfile] [\-p pubkeyfile | \-P pubkey] [\-o] [\-q] \-m file
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.P
\fBminisign\fR \-R \-s seckey \-p pubkeyfile
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.SH "DESCRIPTION"
\fBMinisign\fR is a dead simple tool to sign files and verify signatures\.
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.P
It is portable, lightweight, and uses the highly secure Ed25519 \fIhttp://ed25519\.cr\.yp\.to/\fR public\-key signature system\.
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.SH "OPTIONS"
These options control the actions of \fBminisign\fR\.
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.TP
\fB\-G\fR
Generate a new key pair
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.TP
\fB\-S\fR
Sign files
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.TP
\fB\-V\fR
Verify that a signature is valid for a given file
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.TP
\fB\-m <file>\fR
File to sign/verify
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.TP
\fB\-o\fR
Combined with \-V, output the file content after verification
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.TP
\fB\-H\fR
Combined with \-S, pre\-hash in order to sign large files
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.TP
\fB\-p <pubkeyfile>\fR
Public key file (default: \./minisign\.pub)
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.TP
\fB\-P <pubkey>\fR
Public key, as a base64 string
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.TP
\fB\-s <seckey>\fR
Secret key file (default: ~/\.minisign/minisign\.key)
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.TP
\fB\-x <sigfile>\fR
Signature file (default: <file>\.minisig)
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.TP
\fB\-c <comment>\fR
Add a one\-line untrusted comment
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.TP
\fB\-t <comment>\fR
Add a one\-line trusted comment
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.TP
\fB\-q\fR
Quiet mode, suppress output
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.TP
\fB\-Q\fR
Pretty quiet mode, only print the trusted comment
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.TP
\fB\-R\fR
Recreate a public key file from a secret key file
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.TP
\fB\-f\fR
Force\. Combined with \-G, overwrite a previous key pair
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.TP
\fB\-v\fR
Display version number
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.SH "EXAMPLES"
Creating a key pair
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.P
\fBminisign\fR \-G
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.P
The public key is printed and put into the \fBminisign\.pub\fR file\. The secret key is encrypted and saved as a file named \fB~/\.minisign/minisign\.key\fR\.
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.P
Signing files
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.P
$ \fBminisign\fR \-Sm myfile\.txt $ \fBminisign\fR \-Sm myfile\.txt myfile2\.txt *\.c
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.P
Or to include a comment in the signature, that will be verified and displayed when verifying the file:
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.P
$ \fBminisign\fR \-Sm myfile\.txt \-t \'This comment will be signed as well\'
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.P
The secret key is loaded from \fB${MINISIGN_CONFIG_DIR}/minisign\.key\fR, \fB~/\.minisign/minisign\.key\fR, or its path can be explicitly set with the \fB\-s <path>\fR command\-line switch\.
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.P
Verifying a file
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.P
$ \fBminisign\fR \-Vm myfile\.txt \-p <pubkey>
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.P
or
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.P
$ \fBminisign\fR \-Vm myfile\.txt \-p signature\.pub
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.P
This requires the signature \fBmyfile\.txt\.minisig\fR to be present in the same directory\.
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.P
The public key can either reside in a file (\fB\./minisign\.pub\fR by default) or be directly specified on the command line\.
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.SH "Notes"
\fBTrusted comments\fR
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.P
Signature files include an untrusted comment line that can be freely modified, even after signature creation\.
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.P
They also include a second comment line, that cannot be modified without the secret key\.
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.P
Trusted comments can be used to add instructions or application\-specific metadata (intended file name, timestamps, resource identifiers, version numbers to prevent downgrade attacks)\.
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.P
\fBCompatibility with OpenBSD signify\fR
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.P
Signatures written by \fBminisign\fR can be verified using OpenBSD\'s \fBsignify\fR tool: public key files and signature files are compatible\.
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.P
However, \fBminisign\fR uses a slightly different format to store secret keys\.
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.P
\fBMinisign\fR signatures include trusted comments in addition to untrusted comments\. Trusted comments are signed, thus verified, before being displayed\.
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.P
This adds two lines to the signature files, that signify silently ignores\.
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.P
\fBPre\-hashing\fR
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.P
By default, signing and verification require as much memory as the size of the file\.
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.P
Since \fBMinisign 0\.6\fR, huge files can be signed and verified with very low memory requirements, by pre\-hashing the content\.
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.P
The \-H command\-line switch, in combination with \-S, generates a pre\-hashed signature (HashEdDSA):
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.P
$ \fBminisign\fR \-SHm myfile\.txt
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.P
Verification of such a signature doesn\'t require any specific switch: the appropriate algorithm will automatically be detected\.
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.P
Signatures generated that way are not compatible with OpenBSD\'s \fBsignify\fR tool and are not compatible with \fBMinisign\fR versions prior to 0\.6\.
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.SH "AUTHOR"
Frank Denis (github [at] pureftpd [dot] org)