5 RSA_generate_key_ex, RSA_generate_key - generate RSA key pair
9 #include <openssl/rsa.h>
11 int RSA_generate_key_ex(RSA *rsa, int bits, BIGNUM *e, BN_GENCB *cb);
15 #if OPENSSL_API_COMPAT < 0x00908000L
16 RSA *RSA_generate_key(int num, unsigned long e,
17 void (*callback)(int, int, void *), void *cb_arg);
22 RSA_generate_key_ex() generates a key pair and stores it in the B<RSA>
23 structure provided in B<rsa>. The pseudo-random number generator must
24 be seeded prior to calling RSA_generate_key_ex().
26 The modulus size will be of length B<bits>, and the public exponent will be
27 B<e>. Key sizes with B<num> E<lt> 1024 should be considered insecure.
28 The exponent is an odd number, typically 3, 17 or 65537.
30 A callback function may be used to provide feedback about the
31 progress of the key generation. If B<cb> is not B<NULL>, it
32 will be called as follows using the BN_GENCB_call() function
33 described on the L<BN_generate_prime(3)> page.
39 While a random prime number is generated, it is called as
40 described in L<BN_generate_prime(3)>.
44 When the n-th randomly generated prime is rejected as not
45 suitable for the key, B<BN_GENCB_call(cb, 2, n)> is called.
49 When a random p has been found with p-1 relatively prime to B<e>,
50 it is called as B<BN_GENCB_call(cb, 3, 0)>.
54 The process is then repeated for prime q with B<BN_GENCB_call(cb, 3, 1)>.
56 RSA_generate_key is deprecated (new applications should use
57 RSA_generate_key_ex instead). RSA_generate_key works in the same was as
58 RSA_generate_key_ex except it uses "old style" call backs. See
59 L<BN_generate_prime(3)> for further details.
63 If key generation fails, RSA_generate_key() returns B<NULL>.
65 The error codes can be obtained by L<ERR_get_error(3)>.
69 B<BN_GENCB_call(cb, 2, x)> is used with two different meanings.
71 RSA_generate_key() goes into an infinite loop for illegal input values.
75 L<ERR_get_error(3)>, L<rand(3)>,
76 L<RSA_generate_key(3)>, L<BN_generate_prime(3)>
80 Copyright 2000-2016 The OpenSSL Project Authors. All Rights Reserved.
82 Licensed under the OpenSSL license (the "License"). You may not use
83 this file except in compliance with the License. You can obtain a copy
84 in the file LICENSE in the source distribution or at
85 L<https://www.openssl.org/source/license.html>.