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

Name

Description

r

Destination (may alias a or b).

a

Minuend already reduced modulo m.

b

Subtrahend already reduced modulo m.

m

Modulus (must be positive).

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