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Title "RSA_generate_key 3" For nroff, turn off justification. Always turn off hyphenation; it makes
way too many mistakes in technical documents.
RSA_generate_key_ex, RSA_generate_key - generate RSA key pair Header "SYNOPSIS" .Vb 1 #include <openssl/rsa.h> \& int RSA_generate_key_ex(RSA *rsa, int bits, BIGNUM *e, BN_GENCB *cb); .Ve

Deprecated:

.Vb 2 RSA *RSA_generate_key(int num, unsigned long e, void (*callback)(int,int,void *), void *cb_arg); .Ve

Header "DESCRIPTION" \fBRSA_generate_key_ex() generates a key pair and stores it in the \s-1RSA\s0 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 \fBe. 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 \s-1NULL\s0, 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 \*(L"old style\*(R" call backs. See \fBBN_generate_prime\|(3) for further details.

Header "RETURN VALUE" If key generation fails, RSA_generate_key() returns \s-1NULL\s0.

The error codes can be obtained by ERR_get_error\|(3).

Header "BUGS" \fBBN_GENCB_call(cb, 2, x) is used with two different meanings.

\fBRSA_generate_key() goes into an infinite loop for illegal input values.

Header "SEE ALSO" \fBERR_get_error\|(3), rand\|(3), rsa\|(3), \fBRSA_free\|(3), BN_generate_prime\|(3) Header "HISTORY" The cb_arg argument was added in SSLeay 0.9.0.