RSA_generate_key - generate RSA key pair
#include <openssl/rsa.h> int RSA_generate_key_ex(RSA *rsa, int bits, BIGNUM *e, BN_GENCB *cb); Deprecated: RSA *RSA_generate_key(int num, unsigned long e, void (*callback)(int,int,void *), void *cb_arg);
OpenSSL RSA_generate_key(3openssl)
NAME
RSA_generate_key_ex, RSA_generate_key - generate RSA key pair
SYNOPSIS
#include <openssl/rsa.h>
int RSA_generate_key_ex(RSA *rsa, int bits, BIGNUM *e, BN_GENCB *cb);
Deprecated:
RSA *RSA_generate_key(int num, unsigned long e,
void (*callback)(int,int,void *), void *cb_arg);
DESCRIPTION
RSA_generate_key_ex() generates a key pair and stores it in the RSA
structure provided in rsa. The pseudo-random number generator must be
seeded prior to calling RSA_generate_key_ex().
The modulus size will be of length bits, and the public exponent will
be e. Key sizes with num < 1024 should be considered insecure. The
exponent is an odd number, typically 3, 17 or 65537.
A callback function may be used to provide feedback about the progress
of the key generation. If cb is not NULL, it will be called as follows
using the BN_GENCB_call() function described on the
BN_generate_prime(3) page.
o While a random prime number is generated, it is called as described
in BN_generate_prime(3).
o When the n-th randomly generated prime is rejected as not suitable
for the key, BN_GENCB_call(cb, 2, n) is called.
o When a random p has been found with p-1 relatively prime to e, it
is called as BN_GENCB_call(cb, 3, 0).
The process is then repeated for prime q with BN_GENCB_call(cb, 3, 1).
RSA_generate_key is deprecated (new applications should use
RSA_generate_key_ex instead). RSA_generate_key works in the same way as
RSA_generate_key_ex except it uses "old style" call backs. See
BN_generate_prime(3) for further details.
RETURN VALUE
If key generation fails, RSA_generate_key() returns NULL.
The error codes can be obtained by ERR_get_error(3).
BUGS
BN_GENCB_call(cb, 2, x) is used with two different meanings.
RSA_generate_key() goes into an infinite loop for illegal input values.
ATTRIBUTES
See attributes(7) for descriptions of the following attributes:
+---------------+--------------------------+
|ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+---------------+--------------------------+
|Availability | library/security/openssl |
+---------------+--------------------------+
|Stability | Pass-through uncommitted |
+---------------+--------------------------+
SEE ALSO
ERR_get_error(3), rand(3), rsa(3), RSA_free(3), BN_generate_prime(3)
HISTORY
The cb_arg argument was added in SSLeay 0.9.0.
NOTES
Source code for open source software components in Oracle Solaris can
be found at https://www.oracle.com/downloads/opensource/solaris-source-
code-downloads.html.
This software was built from source available at
https://github.com/oracle/solaris-userland. The original community
source was downloaded from
https://www.openssl.org/source/openssl-1.0.2ze.tar.gz.
Further information about this software can be found on the open source
community website at https://www.openssl.org/.
1.0.2ze 2022-05-03
RSA_generate_key(3openssl)