Compute a reciprocal r = 2ˆ`len` / m for BN_div‐style quotient estimation.

Synopsis

Declared in <openssl/bn.h>

int
BN_reciprocal(
    BIGNUM* r,
    BIGNUM const* m,
    int len,
    BN_CTX* ctx);

Return Value

len on success, or ‐1 on error.

Parameters

Name

Description

r

Destination reciprocal.

m

Divisor.

len

Bit precision of the reciprocal.

ctx

BN_CTX scratch space.

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