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RSA_generate_key(3) OpenSSL RSA_generate_key(3)## NAME

RSA_generate_key_ex, RSA_generate_key - generate RSA key pair## SYNOPSIS

#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);## DESCRIPTION

RSA_generate_key_ex()generates a key pair and stores it in theRSAstructure provided inrsa. The pseudo-random number generator must be seeded prior to callingRSA_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 theBN_GENCB_call()function described on theBN_generate_prime(3) page. o While a random prime number is generated, it is called as described inBN_generate_prime(3). o When the n-th randomly generated prime is rejected as not suitable for the key,BN_GENCB_call(cb,2,n)is called. o 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 was as RSA_generate_key_ex except it uses "old style" call backs. SeeBN_generate_prime(3) for further details.## RETURN VALUE

If key generation fails,RSA_generate_key()returnsNULL. The error codes can be obtained byERR_get_error(3).## BUGS

BN_GENCB_call(cb,2,x)is used with two different meanings.RSA_generate_key()goes into an infinite loop for illegal input values.## SEE ALSO

ERR_get_error(3),rand(3),rsa(3),RSA_free(3),BN_generate_prime(3)## HISTORY

Thecb_argargument was added in SSLeay 0.9.0. 1.0.2h 2016-05-03 RSA_generate_key(3)

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