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136 .IX Title "BN_mod_inverse 3"
137 .TH BN_mod_inverse 3 "2002-09-25" "1.1.0-dev" "OpenSSL"
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143 BN_mod_inverse \- compute inverse modulo n
147 .IX Header "SYNOPSIS"
149 \& #include <openssl/bn.h>
151 \& BIGNUM *BN_mod_inverse(BIGNUM *r, BIGNUM *a, const BIGNUM *n,
155 .IX Header "DESCRIPTION"
156 \&\fIBN_mod_inverse()\fR computes the inverse of \fBa\fR modulo \fBn\fR
157 places the result in \fBr\fR (\f(CW\*(C`(a*r)%n==1\*(C'\fR). If \fBr\fR is \s-1NULL\s0,
158 a new \fB\s-1BIGNUM\s0\fR is created.
160 \&\fBctx\fR is a previously allocated \fB\s-1BN_CTX\s0\fR used for temporary
161 variables. \fBr\fR may be the same \fB\s-1BIGNUM\s0\fR as \fBa\fR or \fBn\fR.
163 .IX Header "RETURN VALUES"
164 \&\fIBN_mod_inverse()\fR returns the \fB\s-1BIGNUM\s0\fR containing the inverse, and
165 \&\s-1NULL\s0 on error. The error codes can be obtained by \fIERR_get_error\fR\|(3).
167 .IX Header "SEE ALSO"
168 \&\fIopenssl_bn\fR\|(3), \fIERR_get_error\fR\|(3), \fIBN_add\fR\|(3)
171 \&\fIBN_mod_inverse()\fR is available in all versions of SSLeay and OpenSSL.