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BN_SET_NEGATIVE(3) Library Functions Manual BN_SET_NEGATIVE(3)

BN_set_negative, BN_is_negative
change and inspect the sign of a BIGNUM

BN_set_negative(BIGNUM *b, int n);
BN_is_negative(const BIGNUM *b);

BN_set_negative() sets b to negative if both b and n are non-zero, otherwise it sets it to positive.
BN_is_negative() tests the sign of b. It is currently implemented as a macro.

BN_is_negative() returns 1 if b is negative or 0 otherwise.

BN_add(3), BN_new(3), BN_set_bit(3), BN_zero(3)

BN_set_negative() and BN_is_negative() first appeared in OpenSSL 0.9.8 and have been available since OpenBSD 4.5.
March 23, 2018 OpenBSD-current