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Manual Reference Pages  -  BN_MOD_INVERSE (3)

.ds Aq ’

NAME

BN_mod_inverse - compute inverse modulo n

CONTENTS

SYNOPSIS



 #include <openssl/bn.h>

 BIGNUM *BN_mod_inverse(BIGNUM *r, BIGNUM *a, const BIGNUM *n,
           BN_CTX *ctx);



DESCRIPTION

BN_mod_inverse() computes the inverse of a modulo n places the result in r ((a*r)%n==1). If r is NULL, a new BIGNUM is created.

ctx is a previously allocated BN_CTX used for temporary variables. r may be the same BIGNUM as a or n.

RETURN VALUES

BN_mod_inverse() returns the BIGNUM containing the inverse, and NULL on error. The error codes can be obtained by ERR_get_error(3).

SEE ALSO

bn(3), ERR_get_error(3), BN_add(3)

HISTORY

BN_mod_inverse() is available in all versions of SSLeay and OpenSSL.
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1.0.1s BN_MOD_INVERSE (3) 2016-03-01

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