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OpenSSL 生成 SM2 密钥

openssl ecparam -name SM2 -genkey -out sm2_ec.key 
cat sm2_ec.key 
-----BEGIN EC PARAMETERS-----
BggqgRzPVQGCLQ==
-----END EC PARAMETERS-----
-----BEGIN EC PRIVATE KEY-----
MHcCAQEEIB9dGHE5+6AD9DGmA8g/cEqn8HYTMBhbM+g2XJ16RqZ1oAoGCCqBHM9V
AYItoUQDQgAEJg19rra1BeuYx9ZU1GbfD0ceE9X67/c2hdb6XZLQor5oNVa+o9HZ
WBioc1hNCC2avO1Dpg5ZAb2YsS71TT7Bsw==
-----END EC PRIVATE KEY-----

OpenSSL 根据SM2私钥生成公钥

openssl ec -in sm2_ec.key -pubout -out sm2_ec.pubkey 
read EC key
writing EC key
cat sm2_ec.pubkey 
-----BEGIN PUBLIC KEY-----
MFkwEwYHKoZIzj0CAQYIKoEcz1UBgi0DQgAEJg19rra1BeuYx9ZU1GbfD0ceE9X6
7/c2hdb6XZLQor5oNVa+o9HZWBioc1hNCC2avO1Dpg5ZAb2YsS71TT7Bsw==
-----END PUBLIC KEY-----

OpenSSL SM3 计算文件Hash

echo "https://const.net.cn" > sign.data 
openssl dgst -SM3 sign.data 
SM3(sign.data)= 8c13610aeb3040b2899ac224ae7db0710030803c424f776e7241340c66a6d553

OpenSSL 使用　SM2 签名文件

openssl dgst -SM3 -sign sm2_ec.key -out sm2_ec.sig sign.data 
Error setting context
140524048778560:error:100C508A:elliptic curve routines:pkey_ec_ctrl:invalid digest type:../crypto/ec/ec_pmeth.c:331:

在当前版本(OpenSSL 1.1.1f)还不支持命令行使用SM2结合SM3签名。将hash算法换成sha256试试。
OpenSSL 使用　SM2 结合　sha256签名

openssl dgst -sha256 -sign sm2_ec.key -out sm2_ec.sig sign.data 
root@hesy-ThinkPad-P15v-Gen-1:/home/hesy/2021/asn1/src/sm# hexdump -C sm2_ec.sig 
00000000  30 46 02 21 00 d7 52 c2  63 a3 12 ff ef af 69 8e  |0F.!..R.c.....i.|
00000010  8a 35 17 9f f2 0c e2 b1  80 fb dd a1 38 a3 59 14  |.5..........8.Y.|
00000020  5a 18 33 ba 43 02 21 00  9d 10 91 a7 5f a4 cf bb  |Z.3.C.!....._...|
00000030  7b 75 c0 27 17 d5 2d 55  09 cc 10 49 29 f8 bc 0d  |{u.'..-U...I)...|
00000040  10 d6 02 db b1 e4 7c 7a                           |......|z|
00000048

OpenSSL 使用　SM2 结合　sha256 验签

openssl dgst -sha256 -verify sm2_ec.pubkey -signature sm2_ec.sig sign.data 
Verified OK

OpenSSL 使用　SM2 结合　SM3 验签

openssl dgst -SM3 -verify sm2_ec.pubkey -signature sm2_ec.sig sign.data 
Error setting context
140471948707136:error:100C508A:elliptic curve routines:pkey_ec_ctrl:invalid digest type:../crypto/ec/ec_pmeth.c:331:

同上面一样的原因，官方没实现，命令行用不了。