248 lines
7.7 KiB
Groff
248 lines
7.7 KiB
Groff
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.\" ========================================================================
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.\"
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.IX Title "SPKAC 1"
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.TH SPKAC 1 "2014-01-06" "1.0.1f" "OpenSSL"
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.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.\" way too many mistakes in technical documents.
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.if n .ad l
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.nh
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.SH "NAME"
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spkac \- SPKAC printing and generating utility
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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\&\fBopenssl\fR \fBspkac\fR
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[\fB\-in filename\fR]
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[\fB\-out filename\fR]
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[\fB\-key keyfile\fR]
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[\fB\-passin arg\fR]
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[\fB\-challenge string\fR]
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[\fB\-pubkey\fR]
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[\fB\-spkac spkacname\fR]
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[\fB\-spksect section\fR]
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[\fB\-noout\fR]
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[\fB\-verify\fR]
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[\fB\-engine id\fR]
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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The \fBspkac\fR command processes Netscape signed public key and challenge
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(\s-1SPKAC\s0) files. It can print out their contents, verify the signature and
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produce its own SPKACs from a supplied private key.
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.SH "COMMAND OPTIONS"
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.IX Header "COMMAND OPTIONS"
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.IP "\fB\-in filename\fR" 4
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.IX Item "-in filename"
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This specifies the input filename to read from or standard input if this
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option is not specified. Ignored if the \fB\-key\fR option is used.
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.IP "\fB\-out filename\fR" 4
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.IX Item "-out filename"
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specifies the output filename to write to or standard output by
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default.
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.IP "\fB\-key keyfile\fR" 4
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.IX Item "-key keyfile"
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create an \s-1SPKAC\s0 file using the private key in \fBkeyfile\fR. The
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\&\fB\-in\fR, \fB\-noout\fR, \fB\-spksect\fR and \fB\-verify\fR options are ignored if
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present.
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.IP "\fB\-passin password\fR" 4
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.IX Item "-passin password"
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the input file password source. For more information about the format of \fBarg\fR
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see the \fB\s-1PASS\s0 \s-1PHRASE\s0 \s-1ARGUMENTS\s0\fR section in \fIopenssl\fR\|(1).
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.IP "\fB\-challenge string\fR" 4
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.IX Item "-challenge string"
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specifies the challenge string if an \s-1SPKAC\s0 is being created.
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.IP "\fB\-spkac spkacname\fR" 4
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.IX Item "-spkac spkacname"
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allows an alternative name form the variable containing the
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\&\s-1SPKAC\s0. The default is \*(L"\s-1SPKAC\s0\*(R". This option affects both
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generated and input \s-1SPKAC\s0 files.
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.IP "\fB\-spksect section\fR" 4
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.IX Item "-spksect section"
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allows an alternative name form the section containing the
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\&\s-1SPKAC\s0. The default is the default section.
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.IP "\fB\-noout\fR" 4
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.IX Item "-noout"
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don't output the text version of the \s-1SPKAC\s0 (not used if an
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\&\s-1SPKAC\s0 is being created).
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.IP "\fB\-pubkey\fR" 4
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.IX Item "-pubkey"
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output the public key of an \s-1SPKAC\s0 (not used if an \s-1SPKAC\s0 is
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being created).
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.IP "\fB\-verify\fR" 4
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.IX Item "-verify"
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verifies the digital signature on the supplied \s-1SPKAC\s0.
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.IP "\fB\-engine id\fR" 4
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.IX Item "-engine id"
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specifying an engine (by its unique \fBid\fR string) will cause \fBspkac\fR
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to attempt to obtain a functional reference to the specified engine,
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thus initialising it if needed. The engine will then be set as the default
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for all available algorithms.
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.SH "EXAMPLES"
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.IX Header "EXAMPLES"
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Print out the contents of an \s-1SPKAC:\s0
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.PP
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.Vb 1
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\& openssl spkac \-in spkac.cnf
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.Ve
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.PP
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Verify the signature of an \s-1SPKAC:\s0
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.PP
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.Vb 1
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\& openssl spkac \-in spkac.cnf \-noout \-verify
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.Ve
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.PP
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Create an \s-1SPKAC\s0 using the challenge string \*(L"hello\*(R":
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.PP
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.Vb 1
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\& openssl spkac \-key key.pem \-challenge hello \-out spkac.cnf
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.Ve
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.PP
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Example of an \s-1SPKAC\s0, (long lines split up for clarity):
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.PP
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.Vb 5
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\& SPKAC=MIG5MGUwXDANBgkqhkiG9w0BAQEFAANLADBIAkEA1cCoq2Wa3Ixs47uI7F\e
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\& PVwHVIPDx5yso105Y6zpozam135a8R0CpoRvkkigIyXfcCjiVi5oWk+6FfPaD03u\e
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\& PFoQIDAQABFgVoZWxsbzANBgkqhkiG9w0BAQQFAANBAFpQtY/FojdwkJh1bEIYuc\e
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\& 2EeM2KHTWPEepWYeawvHD0gQ3DngSC75YCWnnDdq+NQ3F+X4deMx9AaEglZtULwV\e
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\& 4=
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.Ve
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.SH "NOTES"
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.IX Header "NOTES"
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A created \s-1SPKAC\s0 with suitable \s-1DN\s0 components appended can be fed into
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the \fBca\fR utility.
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.PP
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SPKACs are typically generated by Netscape when a form is submitted
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containing the \fB\s-1KEYGEN\s0\fR tag as part of the certificate enrollment
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process.
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.PP
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The challenge string permits a primitive form of proof of possession
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of private key. By checking the \s-1SPKAC\s0 signature and a random challenge
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string some guarantee is given that the user knows the private key
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corresponding to the public key being certified. This is important in
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some applications. Without this it is possible for a previous \s-1SPKAC\s0
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to be used in a \*(L"replay attack\*(R".
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\fIca\fR\|(1)
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