unsigned _goboringcrypto_BN_num_bytes(const GO_BIGNUM*);
int _goboringcrypto_BN_is_negative(const GO_BIGNUM*);
GO_BIGNUM* _goboringcrypto_BN_bin2bn(const uint8_t*, size_t, GO_BIGNUM*);
GO_BIGNUM* _goboringcrypto_BN_le2bn(const uint8_t*, size_t, GO_BIGNUM*);
size_t _goboringcrypto_BN_bn2bin(const GO_BIGNUM*, uint8_t*);
int _goboringcrypto_BN_bn2le_padded(uint8_t*, size_t, const GO_BIGNUM*);