RSA_generate_key(3)
- NetBSD Manual Pages
RSA_generate_key(3) OpenSSL RSA_generate_key(3)
NAME
RSA_generate_key - generate RSA key pair
LIBRARY
libcrypto, -lcrypto
SYNOPSIS
#include <openssl/rsa.h>
RSA *RSA_generate_key(int num, unsigned long e,
void (*callback)(int,int,void *), void *cb_arg);
DESCRIPTION
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-
ate_key().
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
or 65537.
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
called.
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,
1, cb_arg).
RETURN VALUE
If key generation fails, RSA_generate_key() returns NULL;
the error codes can be obtained by ERR_get_error(3).
BUGS
callback(2, x, cb_arg) is used with two different mean-
ings.
RSA_generate_key() goes into an infinite loop for illegal
input values.
SEE ALSO
openssl_err(3), openssl_rand(3), openssl_rsa(3),
2002-06-10 0.9.6g 1
RSA_generate_key(3) OpenSSL RSA_generate_key(3)
RSA_free(3)
HISTORY
The cb_arg argument was added in SSLeay 0.9.0.
2002-06-10 0.9.6g 2
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