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RSA_generate_key(3) OpenSSL RSA_generate_key(3)NAMERSA_generate_key_ex, RSA_generate_key - generate RSA key pairLIBRARYlibcrypto, -lcryptoSYNOPSIS#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);DESCRIPTIONRSA_generate_key_ex() generates a key pair and stores it in theRSAstructure provided inrsa. The pseudo-random number generator must be seeded prior to calling RSA_generate_key_ex(). The modulus size will be of lengthbits, and the public exponent will bee. Key sizes withnum< 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. Ifcbis notNULL, 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 toe, it is called asBN_GENCB_call(cb,3,0). The process is then repeated for prime q withBN_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.RETURNVALUEIf key generation fails, RSA_generate_key() returnsNULL. The error codes can be obtained by ERR_get_error(3).BUGSBN_GENCB_call(cb,2,x)is used with two different meanings. RSA_generate_key() goes into an infinite loop for illegal input values.SEEALSOERR_get_error(3), openssl_rand(3), openssl_rsa(3), RSA_free(3), BN_generate_prime(3)HISTORYThecb_argargument was added in SSLeay 0.9.0. 1.0.2k 2017-01-27 RSA_generate_key(3)