BN_mod_mul_reciprocal, BN_div_recp, BN_RECP_CTX_new, BN_RECP_CTX_free,
BN_RECP_CTX_set - modular multiplication using reciprocal
void BN_RECP_CTX_free(BN_RECP_CTX *recp);
int BN_RECP_CTX_set(BN_RECP_CTX *recp, const BIGNUM *m, BN_CTX *ctx);
int BN_div_recp(BIGNUM *dv, BIGNUM *rem, BIGNUM *a, BN_RECP_CTX *recp,
int BN_mod_mul_reciprocal(BIGNUM *r, BIGNUM *a, BIGNUM *b,
BN_RECP_CTX *recp, BN_CTX *ctx);
can be used to perform an efficient
operation when the operation will be performed repeatedly
with the same modulus. It computes r
, which is set as described below. ctx
previously allocated BN_CTX
used for temporary variables.
allocates and initializes a BN_RECP
frees the components of the BN_RECP
, and, if it
was created by BN_RECP_CTX_new()
, also the structure itself. If
is NULL, nothing is done.
and sets it up for
computing 1/ m
and shifting it left by BN_num_bits(m
)+1 to make
it an integer. The result and the number of bits it was shifted left will
later be stored in recp
. It places
the quotient in dv
and the remainder in rem
structure cannot be shared between threads.
returns the newly allocated BN_RECP_CTX
NULL on error.
has no return value.
For the other functions, 1 is returned for success, 0 on error. The error codes
can be obtained by ERR_get_error(3)
was removed in OpenSSL 1.1.0
Copyright 2000-2017 The OpenSSL Project Authors. All Rights Reserved.
Licensed under the OpenSSL license (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