Update files for OpenSSL-1.0.0f import.
[dragonfly.git] / secure / lib / libcrypto / man / RSA_generate_key.3
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124.\" ========================================================================
125.\"
126.IX Title "RSA_generate_key 3"
e3261593 127.TH RSA_generate_key 3 "2012-01-04" "1.0.0f" "OpenSSL"
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128.\" For nroff, turn off justification. Always turn off hyphenation; it makes
129.\" way too many mistakes in technical documents.
130.if n .ad l
131.nh
984263bc 132.SH "NAME"
74dab6c2 133RSA_generate_key \- generate RSA key pair
984263bc 134.SH "SYNOPSIS"
8b0cefbb 135.IX Header "SYNOPSIS"
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136.Vb 1
137\& #include <openssl/rsa.h>
e257b235 138\&
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139\& RSA *RSA_generate_key(int num, unsigned long e,
140\& void (*callback)(int,int,void *), void *cb_arg);
141.Ve
142.SH "DESCRIPTION"
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143.IX Header "DESCRIPTION"
144\&\fIRSA_generate_key()\fR generates a key pair and returns it in a newly
145allocated \fB\s-1RSA\s0\fR structure. The pseudo-random number generator must
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146be seeded prior to calling \fIRSA_generate_key()\fR.
147.PP
148The modulus size will be \fBnum\fR bits, and the public exponent will be
8b0cefbb 149\&\fBe\fR. Key sizes with \fBnum\fR < 1024 should be considered insecure.
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150The exponent is an odd number, typically 3, 17 or 65537.
151.PP
152A callback function may be used to provide feedback about the
8b0cefbb 153progress of the key generation. If \fBcallback\fR is not \fB\s-1NULL\s0\fR, it
984263bc 154will be called as follows:
8b0cefbb 155.IP "\(bu" 4
984263bc 156While a random prime number is generated, it is called as
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157described in \fIBN_generate_prime\fR\|(3).
158.IP "\(bu" 4
159When the n\-th randomly generated prime is rejected as not
984263bc 160suitable for the key, \fBcallback(2, n, cb_arg)\fR is called.
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161.IP "\(bu" 4
162When a random p has been found with p\-1 relatively prime to \fBe\fR,
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163it is called as \fBcallback(3, 0, cb_arg)\fR.
164.PP
165The process is then repeated for prime q with \fBcallback(3, 1, cb_arg)\fR.
166.SH "RETURN VALUE"
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167.IX Header "RETURN VALUE"
168If key generation fails, \fIRSA_generate_key()\fR returns \fB\s-1NULL\s0\fR; the
169error codes can be obtained by \fIERR_get_error\fR\|(3).
984263bc 170.SH "BUGS"
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171.IX Header "BUGS"
172\&\fBcallback(2, x, cb_arg)\fR is used with two different meanings.
984263bc 173.PP
8b0cefbb 174\&\fIRSA_generate_key()\fR goes into an infinite loop for illegal input values.
984263bc 175.SH "SEE ALSO"
74dab6c2 176.IX Header "SEE ALSO"
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177\&\fIERR_get_error\fR\|(3), \fIrand\fR\|(3), \fIrsa\fR\|(3),
178\&\fIRSA_free\fR\|(3)
179.SH "HISTORY"
74dab6c2 180.IX Header "HISTORY"
8b0cefbb 181The \fBcb_arg\fR argument was added in SSLeay 0.9.0.