346 lines
9.0 KiB
Groff
346 lines
9.0 KiB
Groff
.rn '' }`
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'''
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'''
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.de Sh
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.br
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'''
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'''
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''' Set up \*(-- to give an unbreakable dash;
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''' string Tr holds user defined translation string.
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''' Bell System Logo is used as a dummy character.
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'''
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.tr \(*W-|\(bv\*(Tr
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.ie n \{\
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.ds -- \(*W-
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.ds PI pi
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.if (\n(.H=4u)&(1m=24u) .ds -- \(*W\h'-12u'\(*W\h'-12u'-\" diablo 10 pitch
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''' \*(M", \*(S", \*(N" and \*(T" are the equivalent of
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''' \*(L" and \*(R", except that they are used on ".xx" lines,
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''' such as .IP and .SH, which do another additional levels of
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'br\}
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.\" If the F register is turned on, we'll generate
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.\" index entries out stderr for the following things:
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.\" TH Title
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.\" SH Header
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.\" Sh Subsection
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.\" Ip Item
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.\" X<> Xref (embedded
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.\" Of course, you have to process the output yourself
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.\" in some meaninful fashion.
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.if \nF \{
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.de IX
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.nr % 0
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.rr F
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.\}
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.TH DSA 1 "0.9.5a" "22/Jul/2000" "OpenSSL"
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.UC
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.if n .hy 0
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.if n .na
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.ds C+ C\v'-.1v'\h'-1p'\s-2+\h'-1p'+\s0\v'.1v'\h'-1p'
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..
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.\" @(#)ms.acc 1.5 88/02/08 SMI; from UCB 4.2
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. \" AM - accent mark definitions
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.bd B 3
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.if v .ds ~ \\k:\h'-(\\n(.wu*9/10-\*(#H)'\s-2\u~\d\s+2\h'|\\n:u'
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. \" for low resolution devices (crt and lpr)
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.if \n(.H>23 .if \n(.V>19 \
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\{\
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.\}
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.rm #[ #] #H #V #F C
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.SH "NAME"
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dsa \- DSA key processing
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.SH "SYNOPSIS"
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\fBopenssl\fR \fBdsa\fR
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[\fB\-inform PEM|DER\fR]
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[\fB\-outform PEM|DER\fR]
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[\fB\-in filename\fR]
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[\fB\-passin arg\fR]
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[\fB\-out filename\fR]
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[\fB\-passout arg\fR]
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[\fB\-des\fR]
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[\fB\-des3\fR]
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[\fB\-idea\fR]
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[\fB\-text\fR]
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[\fB\-noout\fR]
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[\fB\-modulus\fR]
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[\fB\-pubin\fR]
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[\fB\-pubout\fR]
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.SH "DESCRIPTION"
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The \fBdsa\fR command processes DSA keys. They can be converted between various
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forms and their components printed out. \fBNote\fR This command uses the
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traditional SSLeay compatible format for private key encryption: newer
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applications should use the more secure PKCS#8 format using the \fBpkcs8\fR
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.SH "COMMAND OPTIONS"
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.Ip "\fB\-inform \s-1DER\s0|\s-1PEM\s0\fR" 4
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This specifies the input format. The \fB\s-1DER\s0\fR option with a private key uses
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an \s-1ASN1\s0 \s-1DER\s0 encoded form of an \s-1ASN\s0.1 \s-1SEQUENCE\s0 consisting of the values of
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version (currently zero), p, q, g, the public and private key components
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respectively as \s-1ASN\s0.1 INTEGERs. When used with a public key it uses a
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SubjectPublicKeyInfo structure: it is an error if the key is not \s-1DSA\s0.
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.Sp
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The \fB\s-1PEM\s0\fR form is the default format: it consists of the \fB\s-1DER\s0\fR format base64
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encoded with additional header and footer lines. In the case of a private key
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\s-1PKCS\s0#8 format is also accepted.
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.Ip "\fB\-outform \s-1DER\s0|\s-1PEM\s0\fR" 4
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This specifies the output format, the options have the same meaning as the
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\fB\-inform\fR option.
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.Ip "\fB\-in filename\fR" 4
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This specifies the input filename to read a key from or standard input if this
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option is not specified. If the key is encrypted a pass phrase will be
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prompted for.
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.Ip "\fB\-passin arg\fR" 4
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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 the \fIopenssl(1)|openssl(1)\fR manpage.
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.Ip "\fB\-out filename\fR" 4
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This specifies the output filename to write a key to or standard output by
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is not specified. If any encryption options are set then a pass phrase will be
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prompted for. The output filename should \fBnot\fR be the same as the input
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filename.
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.Ip "\fB\-passout arg\fR" 4
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the output 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 the \fIopenssl(1)|openssl(1)\fR manpage.
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.Ip "\fB\-des|\-des3|\-idea\fR" 4
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These options encrypt the private key with the \s-1DES\s0, triple \s-1DES\s0, or the
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\s-1IDEA\s0 ciphers respectively before outputting it. A pass phrase is prompted for.
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If none of these options is specified the key is written in plain text. This
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means that using the \fBdsa\fR utility to read in an encrypted key with no
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encryption option can be used to remove the pass phrase from a key, or by
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setting the encryption options it can be use to add or change the pass phrase.
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These options can only be used with \s-1PEM\s0 format output files.
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.Ip "\fB\-text\fR" 4
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prints out the public, private key components and parameters.
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.Ip "\fB\-noout\fR" 4
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this option prevents output of the encoded version of the key.
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.Ip "\fB\-modulus\fR" 4
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this option prints out the value of the public key component of the key.
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.Ip "\fB\-pubin\fR" 4
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by default a private key is read from the input file: with this option a
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public key is read instead.
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.Ip "\fB\-pubout\fR" 4
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by default a private key is output. With this option a public
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key will be output instead. This option is automatically set if the input is
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a public key.
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.SH "NOTES"
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The PEM private key format uses the header and footer lines:
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.PP
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.Vb 2
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\& -----BEGIN DSA PRIVATE KEY-----
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\& -----END DSA PRIVATE KEY-----
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.Ve
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The PEM public key format uses the header and footer lines:
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.PP
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.Vb 2
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\& -----BEGIN PUBLIC KEY-----
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\& -----END PUBLIC KEY-----
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.Ve
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.SH "EXAMPLES"
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To remove the pass phrase on a DSA private key:
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.PP
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.Vb 1
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\& openssl dsa -in key.pem -out keyout.pem
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.Ve
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To encrypt a private key using triple DES:
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.PP
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.Vb 1
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\& openssl dsa -in key.pem -des3 -out keyout.pem
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.Ve
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To convert a private key from PEM to DER format:
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.PP
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.Vb 1
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\& openssl dsa -in key.pem -outform DER -out keyout.der
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.Ve
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To print out the components of a private key to standard output:
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.PP
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.Vb 1
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\& openssl dsa -in key.pem -text -noout
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.Ve
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To just output the public part of a private key:
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.PP
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.Vb 1
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\& openssl dsa -in key.pem -pubout -out pubkey.pem
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.Ve
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.SH "SEE ALSO"
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the \fIdsaparam(1)|dsaparam(1)\fR manpage, the \fIgendsa(1)|gendsa(1)\fR manpage, the \fIrsa(1)|rsa(1)\fR manpage,
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the \fIgenrsa(1)|genrsa(1)\fR manpage
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.rn }` ''
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.IX Title "DSA 1"
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.IX Name "dsa - DSA key processing"
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.IX Header "NAME"
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.IX Header "SYNOPSIS"
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.IX Header "DESCRIPTION"
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.IX Header "COMMAND OPTIONS"
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.IX Item "\fB\-inform \s-1DER\s0|\s-1PEM\s0\fR"
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.IX Item "\fB\-outform \s-1DER\s0|\s-1PEM\s0\fR"
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.IX Item "\fB\-in filename\fR"
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.IX Item "\fB\-passin arg\fR"
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.IX Item "\fB\-out filename\fR"
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.IX Item "\fB\-passout arg\fR"
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.IX Item "\fB\-des|\-des3|\-idea\fR"
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.IX Item "\fB\-text\fR"
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.IX Item "\fB\-noout\fR"
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.IX Item "\fB\-modulus\fR"
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.IX Item "\fB\-pubin\fR"
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.IX Item "\fB\-pubout\fR"
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.IX Header "NOTES"
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.IX Header "EXAMPLES"
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.IX Header "SEE ALSO"
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