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RSA_generate_key.3ssl
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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" RSA_generate_key_ex, RSA_generate_key \- generate RSA key pair .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #include <openssl/rsa.h> \& \& int RSA_generate_key_ex(RSA *rsa, int bits, BIGNUM *e, BN_GENCB *cb); .Ve .PP Deprecated: .PP .Vb 2 \& RSA *RSA_generate_key(int num, unsigned long e, \& void (*callback)(int,int,void *), void *cb_arg); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" \&\fBRSA_generate_key_ex()\fR generates a key pair and stores it in the \fB\s-1RSA\s0\fR structure provided in \fBrsa\fR. The pseudo-random number generator must be seeded prior to calling \fBRSA_generate_key_ex()\fR. .PP The modulus size will be of length \fBbits\fR, and the public exponent will be \&\fBe\fR. Key sizes with \fBnum\fR < 1024 should be considered insecure. The exponent is an odd number, typically 3, 17 or 65537. .PP A callback function may be used to provide feedback about the progress of the key generation. If \fBcb\fR is not \fB\s-1NULL\s0\fR, it will be called as follows using the \fBBN_GENCB_call()\fR function described on the \fBBN_generate_prime\fR\|(3) page. .IP "\(bu" 4 While a random prime number is generated, it is called as described in \fBBN_generate_prime\fR\|(3). .IP "\(bu" 4 When the n\-th randomly generated prime is rejected as not suitable for the key, \fBBN_GENCB_call(cb, 2, n)\fR is called. .IP "\(bu" 4 When a random p has been found with p\-1 relatively prime to \fBe\fR, it is called as \fBBN_GENCB_call(cb, 3, 0)\fR. .PP The process is then repeated for prime q with \fBBN_GENCB_call(cb, 3, 1)\fR. .PP 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\fR\|(3) for further details. .SH "RETURN VALUE" .IX Header "RETURN VALUE" If key generation fails, \fBRSA_generate_key()\fR returns \fB\s-1NULL\s0\fR. .PP The error codes can be obtained by \fBERR_get_error\fR\|(3). .SH "BUGS" .IX Header "BUGS" \&\fBBN_GENCB_call(cb, 2, x)\fR is used with two different meanings. .PP \&\fBRSA_generate_key()\fR goes into an infinite loop for illegal input values. .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fBERR_get_error\fR\|(3), \fBrand\fR\|(3), \fBrsa\fR\|(3), \&\fBRSA_free\fR\|(3), \fBBN_generate_prime\fR\|(3) .SH "HISTORY" .IX Header "HISTORY" The \fBcb_arg\fR argument was added in SSLeay 0.9.0.
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