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Under GNU General Public License
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RSA_generate_key(3) OpenSSL RSA_generate_key(3)
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.
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.
1.0.2k 2017-01-26 RSA_generate_key(3)
Generated by $Id: phpMan.php,v 4.55 2007/09/05 04:42:51 chedong Exp $ Author: Che Dong
On Apache/2.4.6 (CentOS)
Under GNU General Public License
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