安装nugetPortable.BouncyCastle usingOrg.BouncyCastle.Asn1.Pkcs; usingOrg.BouncyCastle.Asn1.X509; usingOrg.BouncyCastle.Crypto; usingOrg.BouncyCastle.Crypto.Parameters; usingOrg.BouncyCastle.Math; usingOrg.BouncyCastle.Pkcs; usingOrg.BouncyCastle.Security; usingOrg.BouncyCastle.X509; usingSystem; usin...