BN_mod_sub_quick

Compute r = (a - b) mod m assuming 0 <= a,b < m.

Synopsis

Declared in <openssl/bn.h>

int
BN_mod_sub_quick(
    BIGNUM* r,
    BIGNUM const* a,
    BIGNUM const* b,
    BIGNUM const* m);

Return Value

1 on success, or 0 on error.

Parameters

NameDescription
rDestination (may alias a or b).
aMinuend already reduced modulo m.
bSubtrahend already reduced modulo m.
mModulus (must be positive).