=pod
=head1 NAME
RSA_generate_key_ex, RSA_generate_key,
RSA_generate_multi_prime_key - generate RSA key pair
=head1 SYNOPSIS
#include
int RSA_generate_key_ex(RSA *rsa, int bits, BIGNUM *e, BN_GENCB *cb);
int RSA_generate_multi_prime_key(RSA *rsa, int bits, int primes, BIGNUM *e, BN_GENCB *cb);
Deprecated:
#if OPENSSL_API_COMPAT < 0x00908000L
RSA *RSA_generate_key(int num, unsigned long e,
void (*callback)(int, int, void *), void *cb_arg);
#endif
=head1 DESCRIPTION
RSA_generate_key_ex() generates a 2-prime RSA key pair and stores it in the
B structure provided in B. The pseudo-random number generator must
be seeded prior to calling RSA_generate_key_ex().
RSA_generate_multi_prime_key() generates a multi-prime RSA key pair and stores
it in the B structure provided in B. The number of primes is given by
the B parameter. The pseudo-random number generator must be seeded prior
to calling RSA_generate_multi_prime_key().
The modulus size will be of length B, the number of primes to form the
modulus will be B, and the public exponent will be B. Key sizes
with B E 1024 should be considered insecure. The exponent is an odd
number, typically 3, 17 or 65537.
In order to maintain adequate security level, the maximum number of permitted
B depends on modulus bit length:
<1024 | >=1024 | >=4096 | >=8192
------+--------+--------+-------
2 | 3 | 4 | 5
A callback function may be used to provide feedback about the
progress of the key generation. If B is not B, it
will be called as follows using the BN_GENCB_call() function
described on the L page.
RSA_generate_prime() is similar to RSA_generate_prime_ex() but
expects an old-style callback function; see
L for information on the old-style callback.
=over 2
=item *
While a random prime number is generated, it is called as
described in L.
=item *
When the n-th randomly generated prime is rejected as not
suitable for the key, B is called.
=item *
When a random p has been found with p-1 relatively prime to B,
it is called as B.
=back
The process is then repeated for prime q and other primes (if any)
with B where B* indicates the i-th prime.
=head1 RETURN VALUE
RSA_generate_multi_prime_key() returns 1 on success or 0 on error.
RSA_generate_key_ex() returns 1 on success or 0 on error.
The error codes can be obtained by L.
RSA_generate_key() returns a pointer to the RSA structure or
B if the key generation fails.
=head1 BUGS
B is used with two different meanings.
=head1 SEE ALSO
L, L, L
=head1 HISTORY
RSA_generate_key() was deprecated in OpenSSL 0.9.8; use
RSA_generate_key_ex() intsead.
=head1 COPYRIGHT
Copyright 2000-2017 The OpenSSL Project Authors. All Rights Reserved.
Licensed under the OpenSSL license (the "License"). You may not use
this file except in compliance with the License. You can obtain a copy
in the file LICENSE in the source distribution or at
L.
=cut
*