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131 .IX Title "RSA_generate_key 3"
132 .TH RSA_generate_key 3 "2017-12-07" "1.0.2n" "OpenSSL"
133 .\" For nroff, turn off justification. Always turn off hyphenation; it makes
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138 RSA_generate_key_ex, RSA_generate_key \- generate RSA key pair
140 .IX Header "SYNOPSIS"
142 \& #include <openssl/rsa.h>
144 \& int RSA_generate_key_ex(RSA *rsa, int bits, BIGNUM *e, BN_GENCB *cb);
150 \& RSA *RSA_generate_key(int num, unsigned long e,
151 \& void (*callback)(int,int,void *), void *cb_arg);
154 .IX Header "DESCRIPTION"
155 \&\fIRSA_generate_key_ex()\fR generates a key pair and stores it in the \fB\s-1RSA\s0\fR
156 structure provided in \fBrsa\fR. The pseudo-random number generator must
157 be seeded prior to calling \fIRSA_generate_key_ex()\fR.
159 The modulus size will be of length \fBbits\fR, and the public exponent will be
160 \&\fBe\fR. Key sizes with \fBnum\fR < 1024 should be considered insecure.
161 The exponent is an odd number, typically 3, 17 or 65537.
163 A callback function may be used to provide feedback about the
164 progress of the key generation. If \fBcb\fR is not \fB\s-1NULL\s0\fR, it
165 will be called as follows using the \fIBN_GENCB_call()\fR function
166 described on the \fIBN_generate_prime\fR\|(3) page.
168 While a random prime number is generated, it is called as
169 described in \fIBN_generate_prime\fR\|(3).
171 When the n\-th randomly generated prime is rejected as not
172 suitable for the key, \fBBN_GENCB_call(cb, 2, n)\fR is called.
174 When a random p has been found with p\-1 relatively prime to \fBe\fR,
175 it is called as \fBBN_GENCB_call(cb, 3, 0)\fR.
177 The process is then repeated for prime q with \fBBN_GENCB_call(cb, 3, 1)\fR.
179 RSA_generate_key is deprecated (new applications should use
180 RSA_generate_key_ex instead). RSA_generate_key works in the same way as
181 RSA_generate_key_ex except it uses \*(L"old style\*(R" call backs. See
182 \&\fIBN_generate_prime\fR\|(3) for further details.
184 .IX Header "RETURN VALUE"
185 If key generation fails, \fIRSA_generate_key()\fR returns \fB\s-1NULL\s0\fR.
187 The error codes can be obtained by \fIERR_get_error\fR\|(3).
190 \&\fBBN_GENCB_call(cb, 2, x)\fR is used with two different meanings.
192 \&\fIRSA_generate_key()\fR goes into an infinite loop for illegal input values.
194 .IX Header "SEE ALSO"
195 \&\fIERR_get_error\fR\|(3), \fIrand\fR\|(3), \fIrsa\fR\|(3),
196 \&\fIRSA_free\fR\|(3), \fIBN_generate_prime\fR\|(3)
199 The \fBcb_arg\fR argument was added in SSLeay 0.9.0.