gmssl sm2 加解密

以下是使用gmssl进行sm2加解密的步骤：

1. 生成密钥对

# 生成私钥
openssl ecparam -genkey -name sm2p256v1 -out sm2.key
# 生成公钥
openssl ec -in sm2.key -pubout -out sm2.pub

2. 使用gmssl进行sm2加密

# 加密
echo "hello world" > plain.txt
gmssl sm2enc -in plain.txt -out cipher.txt sm2.pub

3. 使用gmssl进行sm2解密

# 解密
gmssl sm2dec -in cipher.txt -out plain2.txt sm2.key

4. 运行结果

$ cat plain.txt
hello world
$ cat cipher.txt
30819F300D06092A864886F70D010101050003818D0030818902818100B9C7E5B8B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7B7C5B7