BN_mod_inverse(3) - NetBSD Manual Pages

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BN_mod_inverse(3)                   OpenSSL                  BN_mod_inverse(3)




NAME

       BN_mod_inverse - compute inverse modulo n


LIBRARY

       libcrypto, -lcrypto


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

       openssl_bn(3), ERR_get_error(3), BN_add(3)


HISTORY

       BN_mod_inverse() is available in all versions of SSLeay and OpenSSL.



1.0.1c                            2009-07-19                 BN_mod_inverse(3)