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=pod =head1 NAME BN_mod_inverse - compute inverse modulo n =head1 SYNOPSIS #include <openssl/bn.h> BIGNUM *BN_mod_inverse(BIGNUM *r, BIGNUM *a, const BIGNUM *n, BN_CTX *ctx); =head1 DESCRIPTION BN_mod_inverse() computes the inverse of B<a> modulo B<n> places the result in B<r> (C<(a*r)%n==1>). If B<r> is NULL, a new B<BIGNUM> is created. B<ctx> is a previously allocated B<BN_CTX> used for temporary variables. B<r> may be the same B<BIGNUM> as B<a> or B<n>. =head1 RETURN VALUES BN_mod_inverse() returns the B<BIGNUM> containing the inverse, and NULL on error. The error codes can be obtained by L<ERR_get_error(3)|ERR_get_error(3)>. =head1 SEE ALSO L<bn(3)|bn(3)>, L<ERR_get_error(3)|ERR_get_error(3)>, L<BN_add(3)|BN_add(3)> =head1 HISTORY BN_mod_inverse() is available in all versions of SSLeay and OpenSSL. =cut
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