BIP0340_S_LEN
BIP0340_S_LEN(q_bit_len))
MUST_HAVE((siglen == (BIP0340_R_LEN(p_bit_len) + BIP0340_S_LEN(q_bit_len))), ret, err);
MUST_HAVE((q_len == BIP0340_S_LEN(q_bit_len)), ret, err);
MUST_HAVE((q_len == BIP0340_S_LEN(q_bit_len)), ret, err);
MUST_HAVE((siglen == (BIP0340_R_LEN(p_bit_len) + BIP0340_S_LEN(q_bit_len))), ret, err);