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138.\" ======================================================================
139.\"
140.IX Title "GENRSA 1"
141.TH GENRSA 1 "0.9.7a" "2003-02-19" "OpenSSL"
142.UC
143.SH "NAME"
144genrsa \- generate an \s-1RSA\s0 private key
145.SH "SYNOPSIS"
146.IX Header "SYNOPSIS"
147\&\fBopenssl\fR \fBgenrsa\fR
148[\fB\-out filename\fR]
149[\fB\-passout arg\fR]
150[\fB\-des\fR]
151[\fB\-des3\fR]
152[\fB\-idea\fR]
153[\fB\-f4\fR]
154[\fB\-3\fR]
155[\fB\-rand \f(BIfile\fB\|(s)\fR]
156[\fB\-engine id\fR]
157[\fBnumbits\fR]
158.SH "DESCRIPTION"
159.IX Header "DESCRIPTION"
160The \fBgenrsa\fR command generates an \s-1RSA\s0 private key.
161.SH "OPTIONS"
162.IX Header "OPTIONS"
163.Ip "\fB\-out filename\fR" 4
164.IX Item "-out filename"
165the output filename. If this argument is not specified then standard output is
166used.
167.Ip "\fB\-passout arg\fR" 4
168.IX Item "-passout arg"
169the output file password source. For more information about the format of \fBarg\fR
170see the \fB\s-1PASS\s0 \s-1PHRASE\s0 \s-1ARGUMENTS\s0\fR section in openssl(1).
171.Ip "\fB\-des|\-des3|\-idea\fR" 4
172.IX Item "-des|-des3|-idea"
173These options encrypt the private key with the \s-1DES\s0, triple \s-1DES\s0, or the
174\&\s-1IDEA\s0 ciphers respectively before outputting it. If none of these options is
175specified no encryption is used. If encryption is used a pass phrase is prompted
176for if it is not supplied via the \fB\-passout\fR argument.
177.Ip "\fB\-F4|\-3\fR" 4
178.IX Item "-F4|-3"
179the public exponent to use, either 65537 or 3. The default is 65537.
180.Ip "\fB\-rand \f(BIfile\fB\|(s)\fR" 4
181.IX Item "-rand file"
182a file or files containing random data used to seed the random number
183generator, or an \s-1EGD\s0 socket (see RAND_egd(3)).
184Multiple files can be specified separated by a OS-dependent character.
185The separator is \fB;\fR for MS-Windows, \fB,\fR for OpenVMS, and \fB:\fR for
186all others.
187.Ip "\fB\-engine id\fR" 4
188.IX Item "-engine id"
189specifying an engine (by it's unique \fBid\fR string) will cause \fBreq\fR
190to attempt to obtain a functional reference to the specified engine,
191thus initialising it if needed. The engine will then be set as the default
192for all available algorithms.
193.Ip "\fBnumbits\fR" 4
194.IX Item "numbits"
195the size of the private key to generate in bits. This must be the last option
196specified. The default is 512.
197.SH "NOTES"
198.IX Header "NOTES"
199\&\s-1RSA\s0 private key generation essentially involves the generation of two prime
200numbers. When generating a private key various symbols will be output to
201indicate the progress of the generation. A \fB.\fR represents each number which
202has passed an initial sieve test, \fB+\fR means a number has passed a single
203round of the Miller-Rabin primality test. A newline means that the number has
204passed all the prime tests (the actual number depends on the key size).
205.PP
206Because key generation is a random process the time taken to generate a key
207may vary somewhat.
208.SH "BUGS"
209.IX Header "BUGS"
210A quirk of the prime generation algorithm is that it cannot generate small
211primes. Therefore the number of bits should not be less that 64. For typical
212private keys this will not matter because for security reasons they will
213be much larger (typically 1024 bits).
214.SH "SEE ALSO"
215.IX Header "SEE ALSO"
216gendsa(1)