BIP0340_R_LEN
#define BIP0340_SIGLEN(p_bit_len, q_bit_len) (BIP0340_R_LEN(p_bit_len) + \
MUST_HAVE((siglen == (BIP0340_R_LEN(p_bit_len) + BIP0340_S_LEN(q_bit_len))), ret, err);
MUST_HAVE((p_len == BIP0340_R_LEN(p_bit_len)), ret, err);
MUST_HAVE((p_len == BIP0340_R_LEN(p_bit_len)), ret, err);
MUST_HAVE((siglen == (BIP0340_R_LEN(p_bit_len) + BIP0340_S_LEN(q_bit_len))), ret, err);