=pod =head1 NAME RSA_generate_key_ex, RSA_generate_key - generate RSA key pair =head1 SYNOPSIS #include int RSA_generate_key_ex(RSA *rsa, int bits, 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 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(). The modulus size will be of length 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. 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. =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 with B. 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 L for further details. =head1 RETURN VALUE RSA_generate_key_ex() returns 1 on success or 0 on error. RSA_generate_key() returns the key on success or B on error. The error codes can be obtained by L. =head1 BUGS B is used with two different meanings. RSA_generate_key() goes into an infinite loop for illegal input values. =head1 SEE ALSO L, L, L, L =head1 COPYRIGHT Copyright 2000-2016 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