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Edit File : BN_mod_inverse.3 \| Size : 5.16 KB
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Edit File : BN_mod_inverse.3 | Size : 5.16 KB

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.\" ========================================================================
.\"
.IX Title "BN_MOD_INVERSE 3"
.TH BN_MOD_INVERSE 3 "2023-09-11" "1.1.1w" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
BN_mod_inverse \- compute inverse modulo n
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/bn.h>
\&
\& BIGNUM *BN_mod_inverse(BIGNUM *r, BIGNUM *a, const BIGNUM *n,
\&                        BN_CTX *ctx);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fBBN_mod_inverse()\fR computes the inverse of \fBa\fR modulo \fBn\fR
places the result in \fBr\fR (\f(CW\*(C`(a*r)%n==1\*(C'\fR). If \fBr\fR is \s-1NULL,\s0
a new \fB\s-1BIGNUM\s0\fR is created.
.PP
\&\fBctx\fR is a previously allocated \fB\s-1BN_CTX\s0\fR used for temporary
variables. \fBr\fR may be the same \fB\s-1BIGNUM\s0\fR as \fBa\fR or \fBn\fR.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fBBN_mod_inverse()\fR returns the \fB\s-1BIGNUM\s0\fR containing the inverse, and
\&\s-1NULL\s0 on error. The error codes can be obtained by \fBERR_get_error\fR\|(3).
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBERR_get_error\fR\|(3), \fBBN_add\fR\|(3)
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2000\-2017 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the OpenSSL license (the \*(L"License\*(R").  You may not use
this file except in compliance with the License.  You can obtain a copy
in the file \s-1LICENSE\s0 in the source distribution or at
<https://www.openssl.org/source/license.html>.

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