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Command: RSA_generate_key | Section: 3 | Source: OpenBSD | File: RSA_generate_key.3
RSA_GENERATE_KEY(3) FreeBSD Library Functions Manual 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 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(3) function:
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 VALUES
RSA_generate_key_ex() returns 1 on success or 0 on error.
RSA_generate_key() returns the key on success or NULL on error.
The error codes can be obtained by ERR_get_error(3).
SEE ALSO
BN_generate_prime(3), RSA_get0_key(3), RSA_meth_set_keygen(3), RSA_new(3)
HISTORY
RSA_generate_key() appeared in SSLeay 0.4 or earlier and had its cb_arg
argument added in SSLeay 0.9.0. It has been available since OpenBSD 2.4.
RSA_generate_key_ex() first appeared in OpenSSL 0.9.8 and has been
available since OpenBSD 4.5.
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.
FreeBSD 14.1-RELEASE-p8 June 10, 2019 FreeBSD 14.1-RELEASE-p8