Enji Cooper
102 lines
2.9 KiB
Plaintext
102 lines
2.9 KiB
Plaintext
.\" -*- mode: troff; coding: utf-8 -*-
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.\" Automatically generated by Pod::Man v6.0.2 (Pod::Simple 3.45)
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.IX Title "BN_MOD_INVERSE 3ossl"
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.TH BN_MOD_INVERSE 3ossl 2026-01-27 3.5.5 OpenSSL
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.SH NAME
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BN_mod_inverse \- compute inverse modulo n
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.SH SYNOPSIS
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.IX Header "SYNOPSIS"
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.Vb 1
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\& #include <openssl/bn.h>
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\&
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\& BIGNUM *BN_mod_inverse(BIGNUM *r, BIGNUM *a, const BIGNUM *n,
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\& BN_CTX *ctx);
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.Ve
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.SH DESCRIPTION
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.IX Header "DESCRIPTION"
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\&\fBBN_mod_inverse()\fR computes the inverse of \fBa\fR modulo \fBn\fR
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places the result in \fBr\fR (\f(CW\*(C`(a*r)%n==1\*(C'\fR). If \fBr\fR is NULL,
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a new \fBBIGNUM\fR is created.
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.PP
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\&\fBctx\fR is a previously allocated \fBBN_CTX\fR used for temporary
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variables. \fBr\fR may be the same \fBBIGNUM\fR as \fBa\fR.
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.SH NOTES
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.IX Header "NOTES"
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It is an error to use the same \fBBIGNUM\fR as \fBn\fR.
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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\&\fBBN_mod_inverse()\fR returns the \fBBIGNUM\fR containing the inverse, and
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NULL on error. The error codes can be obtained by \fBERR_get_error\fR\|(3).
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\fBERR_get_error\fR\|(3), \fBBN_add\fR\|(3)
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.SH COPYRIGHT
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.IX Header "COPYRIGHT"
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Copyright 2000\-2017 The OpenSSL Project Authors. All Rights Reserved.
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.PP
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Licensed under the Apache License 2.0 (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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<https://www.openssl.org/source/license.html>.
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