C # data Encrypt Encrypt encryption decryption algorithm - asymmetric algorithms RSACryptoServiceProvider

C # asymmetric data encryption algorithm decryption --- RSACryptoServiceProvider Asymmetric algorithms - Encrypt Encrypt  

C # data Encrypt Encrypt encryption decryption algorithm associated reference System.Security.Cryptography, this library contains MD5, SHA1, SHA256, SHA384, SHA512

MD5 and SHA256 are two of the HashAlgorithm subtypes provided by the .NET Framework. Here are all the major algorithms, in ascending order of security (and hash length, in bytes):
MD5(16) → SHA1(20) → SHA256(32) → SHA384(48) → SHA512(64)
The shorter the algorithm, the faster it executes. MD5 is more than 20 times faster than SHA512 and is well suited to calculating file checksums. You can hash hundreds
of megabytes per second with MD5 , and then store its result in a Guid . (A Guid happens to be exactly 16 bytes long, and as a value type it is more tractable than a byte array;
you can meaningfully compare Guid s with the simple equality operator, for instance.)
However, shorter hashes increase the possibility of collision (two distinct files yielding the same hash).
Use at least SHA256 when hashing passwords or other securitysensitive data. MD5 and SHA1 are considered insecure for this
purpose, and are suitable to protect only against accidental corruption, not deliberate tampering.
SHA384 is no faster than SHA512 , so if you want more security than SHA256 , you may as well use SHA512

 

引用using System.Security.Cryptography;

The main code is code is as follows:

 static void Main(string[] args)
        {
            log4net.Config.XmlConfigurator.Configure();
            Log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);

            TestEncryptgrapg();

            Console.ReadLine();
        }

        public static void TestEncryptgrapg()
        {
            using var rsa = new RSACryptoServiceProvider();
            File.WriteAllText("PublicKeyOnly.xml", rsa.ToXmlString(false));
            File.WriteAllText("PublicPrivate.xml", rsa.ToXmlString(true));

            byte[] data = Encoding.UTF8.GetBytes("Message to encrypt");
            string publicKeyOnly = File.ReadAllText("PublicKeyOnly.xml");
            string publicPrivate = File.ReadAllText("PublicPrivate.xml");
            byte[] encrypted, decrypted;
            using (var rsaPublicOnly = new RSACryptoServiceProvider())
            {
                rsaPublicOnly.FromXmlString(publicKeyOnly);
                encrypted = rsaPublicOnly.Encrypt(data, true);
                // 下面的这解密就会报错，因为需要私钥解密
                // decrypted = rsaPublicOnly.Decrypt (encrypted, true);
            }
            using (var rsaPublicPrivate = new RSACryptoServiceProvider())
            {
                // With the private key we can successfully decrypt:
                rsaPublicPrivate.FromXmlString(publicPrivate);
                decrypted = rsaPublicPrivate.Decrypt(encrypted, true);
                string ss = Encoding.UTF8.GetString(decrypted);
                WriteLog(ss);
            }
        }