RSA_generate_key_ex, RSA_generate_key - generate RSA key pair
#include <openssl/rsa.h> int RSA_generate_key_ex(RSA *rsa, int bits, BIGNUM *e, BN_GENCB *cb);
#if OPENSSL_API_COMPAT < 0x00908000L RSA *RSA_generate_key(int num, unsigned long e, void (*callback)(int, int, void *), void *cb_arg); #endif
RSA_generate_key_ex() generates a key pair and stores it in the RSA structure provided in rsa. The pseudo-random number generator must be seeded prior to calling RSA_generate_key_ex().
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() function described on the BN_generate_prime(3) page.
While a random prime number is generated, it is called as described in BN_generate_prime(3).
When the n-th randomly generated prime is rejected as not suitable for the key, BN_GENCB_call(cb, 2, n) is called.
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.
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).
BN_GENCB_call(cb, 2, x) is used with two different meanings.
RSA_generate_key() goes into an infinite loop for illegal input values.
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