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- .\" -*- mode: troff; coding: utf-8 -*-
- .\" Automatically generated by Pod::Man 5.01 (Pod::Simple 3.43)
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- .\" ========================================================================
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- .IX Title "BN_MOD_INVERSE 3ossl"
- .TH BN_MOD_INVERSE 3ossl 2025-01-17 3.4.0 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 NULL,
- a new \fBBIGNUM\fR is created.
- .PP
- \&\fBctx\fR is a previously allocated \fBBN_CTX\fR used for temporary
- variables. \fBr\fR may be the same \fBBIGNUM\fR as \fBa\fR.
- .SH NOTES
- .IX Header "NOTES"
- It is an error to use the same \fBBIGNUM\fR as \fBn\fR.
- .SH "RETURN VALUES"
- .IX Header "RETURN VALUES"
- \&\fBBN_mod_inverse()\fR returns the \fBBIGNUM\fR containing the inverse, and
- NULL 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 Apache License 2.0 (the "License"). You may not use
- this file except in compliance with the License. You can obtain a copy
- in the file LICENSE in the source distribution or at
- <https://www.openssl.org/source/license.html>.
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