Compute r = (a ‐ b) mod m.

Synopsis

Declared in <openssl/bn.h>

int
BN_mod_sub(
    BIGNUM* r,
    BIGNUM const* a,
    BIGNUM const* b,
    BIGNUM const* m,
    BN_CTX* ctx);

Return Value

1 on success, or 0 on error.

Parameters

Name

Description

r

Destination BIGNUM.

a

Minuend.

b

Subtrahend.

m

Modulus (must be positive).

ctx

Optional BN_CTX for temporaries, or NULL.

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