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134 .IX Title "BN_mod_inverse 3"
135 .TH BN_mod_inverse 3 "2009-11-06" "0.9.8l" "OpenSSL"
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141 BN_mod_inverse \- compute inverse modulo n
143 .IX Header "SYNOPSIS"
145 \& #include <openssl/bn.h>
147 \& BIGNUM *BN_mod_inverse(BIGNUM *r, BIGNUM *a, const BIGNUM *n,
151 .IX Header "DESCRIPTION"
152 \&\fIBN_mod_inverse()\fR computes the inverse of \fBa\fR modulo \fBn\fR
153 places the result in \fBr\fR (\f(CW\*(C`(a*r)%n==1\*(C'\fR). If \fBr\fR is \s-1NULL\s0,
154 a new \fB\s-1BIGNUM\s0\fR is created.
156 \&\fBctx\fR is a previously allocated \fB\s-1BN_CTX\s0\fR used for temporary
157 variables. \fBr\fR may be the same \fB\s-1BIGNUM\s0\fR as \fBa\fR or \fBn\fR.
159 .IX Header "RETURN VALUES"
160 \&\fIBN_mod_inverse()\fR returns the \fB\s-1BIGNUM\s0\fR containing the inverse, and
161 \&\s-1NULL\s0 on error. The error codes can be obtained by \fIERR_get_error\fR\|(3).
163 .IX Header "SEE ALSO"
164 \&\fIbn\fR\|(3), \fIERR_get_error\fR\|(3), \fIBN_add\fR\|(3)
167 \&\fIBN_mod_inverse()\fR is available in all versions of SSLeay and OpenSSL.