211 lines
6.7 KiB
Groff
211 lines
6.7 KiB
Groff
.\" $NetBSD: openssl_genrsa.1,v 1.13 2005/04/24 00:10:04 wiz Exp $
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.\" ========================================================================
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.\"
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.IX Title "GENRSA 1"
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.TH GENRSA 1 "2003-07-24" "0.9.7g" "OpenSSL"
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.SH "NAME"
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genrsa \- generate an RSA private key
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.SH "LIBRARY"
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libcrypto, -lcrypto
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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\&\fBopenssl\fR \fBgenrsa\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\-f4\fR]
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[\fB\-3\fR]
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[\fB\-rand file(s)\fR]
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[\fB\-engine id\fR]
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[\fBnumbits\fR]
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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The \fBgenrsa\fR command generates an \s-1RSA\s0 private key.
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.SH "OPTIONS"
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.IX Header "OPTIONS"
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.IP "\fB\-out filename\fR" 4
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.IX Item "-out filename"
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the output filename. If this argument is not specified then standard output is
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used.
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.IP "\fB\-passout arg\fR" 4
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.IX Item "-passout arg"
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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 \fIopenssl\fR\|(1).
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.IP "\fB\-des|\-des3|\-idea\fR" 4
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.IX Item "-des|-des3|-idea"
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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. If none of these options is
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specified no encryption is used. If encryption is used a pass phrase is prompted
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for if it is not supplied via the \fB\-passout\fR argument.
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.IP "\fB\-F4|\-3\fR" 4
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.IX Item "-F4|-3"
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the public exponent to use, either 65537 or 3. The default is 65537.
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.IP "\fB\-rand file(s)\fR" 4
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.IX Item "-rand file(s)"
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a file or files containing random data used to seed the random number
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generator, or an \s-1EGD\s0 socket (see \fIRAND_egd\fR\|(3)).
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Multiple files can be specified separated by a OS-dependent character.
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The separator is \fB;\fR for MS\-Windows, \fB,\fR for OpenVMS, and \fB:\fR for
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all others.
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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 it's unique \fBid\fR string) will cause \fBreq\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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.IP "\fBnumbits\fR" 4
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.IX Item "numbits"
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the size of the private key to generate in bits. This must be the last option
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specified. The default is 512.
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.SH "NOTES"
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.IX Header "NOTES"
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\&\s-1RSA\s0 private key generation essentially involves the generation of two prime
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numbers. When generating a private key various symbols will be output to
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indicate the progress of the generation. A \fB.\fR represents each number which
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has passed an initial sieve test, \fB+\fR means a number has passed a single
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round of the Miller-Rabin primality test. A newline means that the number has
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passed all the prime tests (the actual number depends on the key size).
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.PP
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Because key generation is a random process the time taken to generate a key
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may vary somewhat.
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.SH "BUGS"
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.IX Header "BUGS"
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A quirk of the prime generation algorithm is that it cannot generate small
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primes. Therefore the number of bits should not be less that 64. For typical
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private keys this will not matter because for security reasons they will
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be much larger (typically 1024 bits).
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\fIgendsa\fR\|(1)
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