字符串的加密和解密 [英] Encryption and Decryption of a string

问题描述

我想对字符串进行加密，也想对字符串进行解密.加密后，加密后的值必须为字母数字.它不应包含任何特殊字符.

预先谢谢您

I want to encrypt a string and also I want to decrypt the string.After encryption the encrypted value must be alphanumeric. It should not contain any special characters.

Advance Thank You

推荐答案

string s = "Foo bar";
string s1 = Convert.ToBase64String(Encoding.Unicode.GetBytes(s));

//And back...
string s2 = Encoding.Unicode.GetString(Convert.FromBase64String(s1))

另一种精心设计的方式:

another elaborated way:

public static string Decrypt(string encryptedText)
		{
			byte[] cipherTextBytes = Convert.FromBase64String(encryptedText);
			byte[] keyBytes = new Rfc2898DeriveBytes(PasswordHash, Encoding.ASCII.GetBytes(SaltKey)).GetBytes(256 / 8);
			var symmetricKey = new RijndaelManaged() { Mode = CipherMode.CBC, Padding = PaddingMode.None };

			var decryptor = symmetricKey.CreateDecryptor(keyBytes, Encoding.ASCII.GetBytes(VIKey));
			var memoryStream = new MemoryStream(cipherTextBytes);
			var cryptoStream = new CryptoStream(memoryStream, decryptor, CryptoStreamMode.Read);
			byte[] plainTextBytes = new byte[cipherTextBytes.Length];

			int decryptedByteCount = cryptoStream.Read(plainTextBytes, 0, plainTextBytes.Length);
			memoryStream.Close();
			cryptoStream.Close();
			return Encoding.UTF8.GetString(plainTextBytes, 0, decryptedByteCount).TrimEnd("\0".ToCharArray());
		}


public static string Encrypt(string plainText)
		{
			byte[] plainTextBytes = Encoding.UTF8.GetBytes(plainText);

			byte[] keyBytes = new Rfc2898DeriveBytes(PasswordHash, Encoding.ASCII.GetBytes(SaltKey)).GetBytes(256 / 8);
			var symmetricKey = new RijndaelManaged() { Mode = CipherMode.CBC, Padding = PaddingMode.Zeros };
			var encryptor = symmetricKey.CreateEncryptor(keyBytes, Encoding.ASCII.GetBytes(VIKey));
			
			byte[] cipherTextBytes;

			using (var memoryStream = new MemoryStream())
			{
				using (var cryptoStream = new CryptoStream(memoryStream, encryptor, CryptoStreamMode.Write))
				{
					cryptoStream.Write(plainTextBytes, 0, plainTextBytes.Length);
					cryptoStream.FlushFinalBlock();
					cipherTextBytes = memoryStream.ToArray();
					cryptoStream.Close();
				}
				memoryStream.Close();
			}
			return Convert.ToBase64String(cipherTextBytes);
		}

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