RSA_generate_key(3) LibreSSL 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);
DESCRIPTIONRSA_generate_key_ex() generates a key pair and stores it in the RSA
structure provided in rsa.
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:
· While a random prime number is generated, it is called as described
in BN_generate_prime(3).
· When the n-th randomly generated prime is rejected as not suitable
for the key, BN_GENCB_call(cb, 2, n) is called.
· 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 was 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 ALSOERR_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.
LibreSSL 2015-12-05 RSA_generate_key(3)
