RSA_generate_key - generate RSA key pair
RSA *RSA_generate_key(int num, unsigned long e,
void (*callback)(int,int,void *), void *cb_arg);
RSA_generate_key() generates a key pair and returns it in
a newly allocated RSA structure. The pseudo-random number
generator must be seeded prior to calling RSA_gener-
The modulus size will be num 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
A callback function may be used to provide feedback about
the progress of the key generation. If callback is not
NULL, it will be called as follows:
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, callback(2, n, cb_arg) is
o When a random p has been found with p-1 relatively
prime to e, it is called as callback(3, 0, cb_arg).
The process is then repeated for prime q with callback(3,
If key generation fails, RSA_generate_key() returns NULL;
the error codes can be obtained by ERR_get_error(3).
callback(2, x, cb_arg) is used with two different meanings.
RSA_generate_key() goes into an infinite loop for illegal
ERR_get_error(3), rand(3), rsa(3), RSA_free(3)
The cb_arg argument was added in SSLeay 0.9.0.
OpenBSD 3.6 2003-05-11 1 [ Back ]