SM2 SM3 SM4对称加解密，国密密钥对的生成

代码说明：

  此工具支持国密各种算法：SM4对称加解密，国密密钥对的生成，SM3信息摘要，SM2数字签名以及验证签名，SM2非对称加解密，PKCS7签名数据包形成以及PKCS7验签， 生成PKCS7数字信封已经解PKCS7签名数据，后续会添加PKCS7签名数字信封相关功能。输入输出格式都严格按照国家密码管理局的相关规定。形成一个本地工具方便大家使用。(This tool supports various national algorithms: SM4 symmetric encryption and decryption, national secret key pair generation, SM3 information summary, SM2 digital signature and verification signature, SM2 asymmetric encryption and decryption, PKCS7 signature data packet formation and PKCS7 checkin, PKCS7 digital envelopes have already solved PKCS7 signature numbers, and then PKCS7 signature digital envelopes will be added. Related functions. The input and output formats are in strict accordance with the relevant regulations of the State Encryption administration. The formation of a local tool is convenient for everyone to use.)