194 lines
5.6 KiB
Groff
194 lines
5.6 KiB
Groff
.\" Automatically generated by Pod::Man version 1.15
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.\" Mon Jan 13 19:28:32 2003
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.\" ======================================================================
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.\"
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.IX Title "RSA_generate_key 3"
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.TH RSA_generate_key 3 "0.9.7" "2003-01-13" "OpenSSL"
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.UC
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.SH "NAME"
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RSA_generate_key \- generate \s-1RSA\s0 key pair
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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.Vb 1
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\& #include <openssl/rsa.h>
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.Ve
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.Vb 2
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\& RSA *RSA_generate_key(int num, unsigned long e,
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\& void (*callback)(int,int,void *), void *cb_arg);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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\&\fIRSA_generate_key()\fR generates a key pair and returns it in a newly
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allocated \fB\s-1RSA\s0\fR structure. The pseudo-random number generator must
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be seeded prior to calling \fIRSA_generate_key()\fR.
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.PP
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The modulus size will be \fBnum\fR bits, and the public exponent will be
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\&\fBe\fR. Key sizes with \fBnum\fR < 1024 should be considered insecure.
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The exponent is an odd number, typically 3, 17 or 65537.
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.PP
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A callback function may be used to provide feedback about the
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progress of the key generation. If \fBcallback\fR is not \fB\s-1NULL\s0\fR, it
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will be called as follows:
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.Ip "\(bu" 4
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While a random prime number is generated, it is called as
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described in BN_generate_prime(3).
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.Ip "\(bu" 4
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When the n-th randomly generated prime is rejected as not
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suitable for the key, \fBcallback(2, n, cb_arg)\fR is called.
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.Ip "\(bu" 4
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When a random p has been found with p-1 relatively prime to \fBe\fR,
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it is called as \fBcallback(3, 0, cb_arg)\fR.
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.PP
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The process is then repeated for prime q with \fBcallback(3, 1, cb_arg)\fR.
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.SH "RETURN VALUE"
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.IX Header "RETURN VALUE"
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If key generation fails, \fIRSA_generate_key()\fR returns \fB\s-1NULL\s0\fR; the
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error codes can be obtained by ERR_get_error(3).
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.SH "BUGS"
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.IX Header "BUGS"
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\&\fBcallback(2, x, cb_arg)\fR is used with two different meanings.
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.PP
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\&\fIRSA_generate_key()\fR goes into an infinite loop for illegal input values.
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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ERR_get_error(3), rand(3), rsa(3),
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RSA_free(3)
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.SH "HISTORY"
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.IX Header "HISTORY"
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The \fBcb_arg\fR argument was added in SSLeay 0.9.0.
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