How to encrypt SM2 without ASN.1?

[DanielD00]

3.1.1 version encrypt text by SM2.The length of the ciphertext it too long.I look up information.The ciphertext is found in ASN.1 format.

I have no idea how to code.

Generate the EVP_Pkey through HEX:

*ctx = EVP_PKEY_CTX_new_from_name(nullptr, "SM2", nullptr);
int i = EVP_PKEY_fromdata_init(*ctx); if (i != 1) break;

params_build = OSSL_PARAM_BLD_new();
OSSL_PARAM_BLD_push_utf8_string(params_build, OSSL_PKEY_PARAM_GROUP_NAME, "SM2", 0);
if (pubKeyLen > 0) {
    OSSL_PARAM_BLD_push_octet_string(params_build, OSSL_PKEY_PARAM_PUB_KEY, publicKeyXY.data(), publicKeyXY.size());
}
if (priKeyLen > 0) {
    OSSL_PARAM_BLD_push_BN(params_build, OSSL_PKEY_PARAM_PRIV_KEY, BNPriKey);
}
params = OSSL_PARAM_BLD_to_param(params_build);
int status = EVP_PKEY_fromdata(*ctx, evpPkey, EVP_PKEY_KEYPAIR, params);

encrypt code:

evpPkeyCTX = EVP_PKEY_CTX_new_from_pkey(nullptr, evpPkey, nullptr); if (evpPkeyCTX == nullptr) break;
size_t dataLen;
if (cryptType == 0) {
    i = EVP_PKEY_encrypt_init(evpPkeyCTX); if (1 <= 0) break;
    i = EVP_PKEY_encrypt(evpPkeyCTX, nullptr, &dataLen, (unsigned char*)strData.data(), strData.length()); if (i <= 0) break;
    dataBuf = (unsigned char*)OPENSSL_zalloc(dataLen); if (dataBuf == nullptr) break;
    i = EVP_PKEY_encrypt(evpPkeyCTX, dataBuf, &dataLen, (unsigned char*)strData.data(), strData.length()); if (i <= 0) break;
}
else {
    i = EVP_PKEY_decrypt_init(evpPkeyCTX); if (1 <= 0) break;
    i = EVP_PKEY_decrypt(evpPkeyCTX, nullptr, &dataLen, (unsigned char*)strData.data(), strData.length()); if (i <= 0) break;
    dataBuf = (unsigned char*)OPENSSL_zalloc(dataLen); if (dataBuf == nullptr) break;
    i = EVP_PKEY_decrypt(evpPkeyCTX, dataBuf, &dataLen, (unsigned char*)strData.data(), strData.length()); if (i <= 0) break;
}
retStr.assign((char*)dataBuf, dataLen);

priKey hex:
D07E969F55F8D8D1F813A0EF0237CF93E53679A3CB65FD42FD9EB3239DBE5BF5
pubKey hex:
A40C45E02417662AF9DA9EEC5953E8604FB2D59BC3EAE5AABE1D7540B588941E6484EEC9DDCF46B84D198E6659770484A38CCC0646A7546FE5AB2E3D5CD2CF03
original text:123
0x495051
ciphertext,the length is 111
306D022100D6745DA3D9DFFA524C28F604044BF72F001DFCA7201B5F25F5A65E8A37E7E403022100B18DD514D804A523E1DC43BCF3E1EAB8F464B7DC3466144A86AEACCF0EEE420B04209CD81FF4E9AD4BEBB5C69FB62ECE71272E3E375706488C6886CE0434C82DF87B040329106B

I use the online SM2 tool,use the same pubkey,the length of ciphertext is 99:
6F2FC4248432255EDD9641D45D6753C7F27A914BB91303D6A08D34C5F9CDD6934205A86FFDE49B1C9D7AF58C57A96CC0963C3E671F37A4A49CD7894875B9987F942FE2EF8F25686329C92047D3CB674E37760B03BB647F0D67972D0B05AC0DCFA7167A