Certificate verify报文的生成和校验的疑问

[xbguo]

RFC和国密标准说是要对client hello 到 certificate verify(不包含）之间的所有交互报文做签名，现在看代码，是对一块固定大小的摘要数据做签名

客户端侧：
` if (EC_GROUP_get_curve_name(EC_KEY_get0_group(pkey->pkey.ec)) == NID_sm2)
{
size_t _j_j = EVP_PKEY_size(pkey);

            tass_md = EVP_sm3();
            if (EVP_DigestSignInit(&mctx, NULL, tass_md, NULL, pkey) <= 0
                || EVP_DigestSignUpdate(&mctx, &(data[MD5_DIGEST_LENGTH]), tass_md->md_size) <= 0
                || EVP_DigestSignFinal(&mctx, &(p[2]), (size_t *)&_j_j) <= 0)
            {
                SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, ERR_R_ECDSA_LIB);
                goto err;
            }`

服务器侧：
` if (EC_GROUP_get_curve_name(EC_KEY_get0_group(pkey->pkey.ec)) == NID_sm2)
{
int offset;
md = EVP_sm3();

        EVP_MD_CTX_init(&mctx);
        if (ssl_get_algorithm2(s) & SSL_HANDSHAKE_MAC_SM3)
            offset = 0;
        else
            offset = MD5_DIGEST_LENGTH;

        if (EVP_DigestVerifyInit(&mctx, NULL, md, NULL, pkey) <= 0
            || EVP_DigestVerifyUpdate(&mctx, &s->s3->tmp.cert_verify_md[offset], md->md_size) <= 0
            || EVP_DigestVerifyFinal(&mctx, p, (size_t)i) <= 0)
        {
            /* bad signature */
            al = SSL_AD_DECRYPT_ERROR;
            SSLerr(SSL_F_SSL3_GET_CERT_VERIFY, SSL_R_BAD_ECDSA_SIGNATURE);
            goto f_err;
        }`