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.\" ========================================================================
.\"
.IX Title "RSA_generate_key 3openssl"
.TH RSA_generate_key 3openssl "2016-05-03" "1.0.1t" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
RSA_generate_key \- generate RSA key pair
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/rsa.h>
\&
\& RSA *RSA_generate_key(int num, unsigned long e,
\&    void (*callback)(int,int,void *), void *cb_arg);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fIRSA_generate_key()\fR generates a key pair and returns it in a newly
allocated \fB\s-1RSA\s0\fR structure. The pseudo-random number generator must
be seeded prior to calling \fIRSA_generate_key()\fR.
.PP
The modulus size will be \fBnum\fR bits, and the public exponent will be
\&\fBe\fR. Key sizes with \fBnum\fR < 1024 should be considered insecure.
The exponent is an odd number, typically 3, 17 or 65537.
.PP
A callback function may be used to provide feedback about the
progress of the key generation. If \fBcallback\fR is not \fB\s-1NULL\s0\fR, it
will be called as follows:
.IP "\(bu" 4
While a random prime number is generated, it is called as
described in \fIBN_generate_prime\fR\|(3).
.IP "\(bu" 4
When the n\-th randomly generated prime is rejected as not
suitable for the key, \fBcallback(2, n, cb_arg)\fR is called.
.IP "\(bu" 4
When a random p has been found with p\-1 relatively prime to \fBe\fR,
it is called as \fBcallback(3, 0, cb_arg)\fR.
.PP
The process is then repeated for prime q with \fBcallback(3, 1, cb_arg)\fR.
.SH "RETURN VALUE"
.IX Header "RETURN VALUE"
If key generation fails, \fIRSA_generate_key()\fR returns \fB\s-1NULL\s0\fR; the
error codes can be obtained by \fIERR_get_error\fR\|(3).
.SH "BUGS"
.IX Header "BUGS"
\&\fBcallback(2, x, cb_arg)\fR is used with two different meanings.
.PP
\&\fIRSA_generate_key()\fR goes into an infinite loop for illegal input values.

.\" Oracle has added the ARC stability level to this manual page
.SH ATTRIBUTES
See
.BR attributes (5)
for descriptions of the following attributes:
.sp
.TS
box;
cbp-1 | cbp-1
l | l .
ATTRIBUTE TYPE	ATTRIBUTE VALUE 
=
Availability	library/security/openssl
=
Stability	Uncommitted
.TE 
.PP
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fIERR_get_error\fR\|(3), \fIrand\fR\|(3), \fIrsa\fR\|(3),
\&\fIRSA_free\fR\|(3)
.SH "HISTORY"
.IX Header "HISTORY"
The \fBcb_arg\fR argument was added in SSLeay 0.9.0.


.SH NOTES

.\" Oracle has added source availability information to this manual page
This software was built from source available at https://java.net/projects/solaris-userland.  The original community source was downloaded from  http://www.openssl.org/source/openssl-1.0.1t.tar.gz

Further information about this software can be found on the open source community website at http://www.openssl.org/.