Add a man page for the new command-line PuTTYgen.

[originally from svn r3766]

diff --git a/unix/puttygen.1 b/unix/puttygen.1
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+.TH puttygen 1
+.UC
+.SH NAME
+puttygen \- public-key generator for the PuTTY tools
+.SH SYNOPSIS
+\fBputtygen\fP ( \fIkeyfile\fP | \-t \fIkeytype\fP [ \-b \fIbits\fP ] )
+         [ \-C \fInew-comment\fP ] [ \-P ]
+         [ \-O \fIoutput-type\fP | \-l | \-L | \-p ]
+         [ \-o \fIoutput-file\fP ]
+.SH DESCRIPTION
+\fBputtygen\fP is a tool to generate and manipulate SSH public and
+private key pairs. It is part of the PuTTY suite, although it can
+also interoperate with the private key formats used by some other
+SSH clients.
+
+When you run \fBputtygen\fP, it does three things. Firstly, it
+either loads an existing key file (if you specified \fIkeyfile\fP),
+or generates a new key (if you specified \fIkeytype\fP). Then, it
+optionally makes modifications to the key (changing the comment
+and/or the passphrase); finally, it outputs the key, or some
+information about the key, to a file.
+
+All three of these phases are controlled by the options described in
+the following section.
+.SH OPTIONS
+In the first phase, \fBputtygen\fP either loads or generates a key.
+The options to control this are:
+.IP "\fIkeyfile\fP"
+Specify a private key file to be loaded. This private key file can
+be in the (de facto standard) SSH1 key format, or in PuTTY's SSH2
+key format, or in either of the SSH2 private key formats used by
+OpenSSH and ssh.com's implementation.
+.IP "\fB\-t\fP \fIkeytype\fP"
+Specify a type of key to generate. The acceptable values here are
+\fBrsa\fP and \fBdsa\fP (to generate SSH2 keys), and \fBrsa1\fP (to
+generate SSH1 keys).
+.IP "\fB\-b\fP \fIbits\fP"
+Specify the size of the key to generate, in bits. Default is 1024.
+.PP
+In the second phase, \fBputtygen\fP optionally alters properties of
+the key it has loaded or generated. The options to control this are:
+.IP "\fB\-C\fP \fInew\-comment\fP"
+Specify a comment string to describe the key. This comment string
+will be used by PuTTY to identify the key to you (when asking you to
+enter the passphrase, for example, so that you know which passphrase
+to type).
+.IP "\fB\-P\fP"
+Indicate that you want to change the key's passphrase. This is
+automatic when you are generating a new key, but not when you are
+modifying an existing key.
+.PP
+In the third phase, \fBputtygen\fP saves the key or information
+about it. The options to control this are:
+.IP "\fB\-O\fP \fIoutput\-type\fP"
+Specify the type of output you want \fBputtygen\fP to produce.
+Acceptable options are:
+.RS
+.IP "\fBprivate\fP"
+Save the private key in a format usable by PuTTY. This will either
+be the standard SSH1 key format, or PuTTY's own SSH2 key format.
+.IP "\fBpublic\fP"
+Save the public key only. For SSH1 keys, the standard public key
+format will be used ("1024 37 5698745...."). For SSH2 keys, the
+public key will be output in the format specified in the IETF
+drafts, which is a multi-line text file beginning with the line
+"---- BEGIN SSH2 PUBLIC KEY ----".
+.IP "\fBpublic-openssh\fP"
+Save the public key only, in a format usable by OpenSSH. For SSH1
+keys, this output format behaves identically to \fBpublic\fP. For
+SSH2 keys, the public key will be output in the OpenSSH format,
+which is a single line ("ssh-rsa AAAAB3NzaC1yc2...").
+.IP "\fBfingerprint\fP"
+Print the fingerprint of the public key. All fingerprinting
+algorithms are believed compatible with OpenSSH.
+.IP "\fBprivate-openssh\fP"
+Save an SSH2 private key in OpenSSH's format. This option is not
+permitted for SSH1 keys.
+.IP "\fBprivate-sshcom\fP"
+Save an SSH2 private key in ssh.com's format. This option is not
+permitted for SSH1 keys.
+.RE
+.IP
+If no output type is specified, the default is \fBprivate\fP.
+.IP "\fB\-o\fP \fIoutput\-file\fP"
+Specify the file where \fBputtygen\fP should write its output. If
+this option is not specified, \fBputtygen\fP will assume you want to
+overwrite the original file if the input and output file types are
+the same (changing a comment or passphrase), and will assume you
+want to output to stdout if you are asking for a public key or
+fingerprint. Otherwise, the \fB\-o\fP option is required.
+.IP "\fB\-l\fP"
+Synonym for "\fB-O fingerprint\fP".
+.IP "\fB\-L\fP"
+Synonym for "\fB-O public-openssh\fP".
+.IP "\fB\-p\fP"
+Synonym for "\fB-O public\fP".
+.SH EXAMPLES
+To generate an SSH2 RSA key pair and save it in PuTTY's own format
+(you will be prompted for the passphrase):
+
+\fBputtygen -t rsa -C "my home key" -o mykey.ppk\fP
+
+To generate a larger (2048-bit) key:
+
+\fBputtygen -t rsa -b 2048 -C "my home key" -o mykey.ppk\fP
+
+To change the passphrase on a key (you will be prompted for the old
+and new passphrases):
+
+\fBputtygen -P mykey.ppk\fP
+
+To change the comment on a key:
+
+\fBputtygen -C "new comment" mykey.ppk\fP
+
+To convert a key into OpenSSH's private key format:
+
+\fBputtygen mykey.ppk -O private-openssh -o my-openssh-key\fP
+
+To convert a key \fIfrom\fP another format (\fBputtygen\fP will
+automatically detect the input key type):
+
+\fBputtygen my-ssh.com-key -o mykey.ppk\fP
+
+To display the fingerprint of a key (some key types require a
+passphrase to extract even this much information):
+
+\fBputtygen -l mykey.ppk\fP
+
+To add the OpenSSH-format public half of a key to your authorised
+keys file:
+
+\fBputtygen -L mykey.ppk >> $HOME/.ssh/authorized_keys\fP
+
+.SH BUGS
+There's currently no way to supply passphrases in batch mode, or
+even just to specify that you don't want a passphrase at all.