C#des Encrypting and decrypting strings

1. Adding references

Using System.security.cryptography;using System.IO;

2. Add default key vector

Default key vector private static byte[] Keys = {0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF};

3. Adding a cryptographic decryption class

 <summary>/// des encrypted string/// </summary>/// <param name= "EncryptString" > String to encrypt </param>/// <param name= "Encryptkey" > Encryption key, required for 8-bit </param>/// < Returns> encryption successfully returns the encrypted string, failing to return the source string  </returns>public static string encryptdes (string  encryptstring, string encryptkey) {    try    {     byte[] rgbkey = encoding.utf8.getbytes (encryptkey.substring (0, 8));// Convert to bytes     byte[] rgbIV = Keys;    byte[]  Inputbytearray = encoding.utf8.getbytes (encryptstring);     Descryptoserviceprovider dcsp = new descryptoserviceprovider ();//Instantiate Data Encryption Standard      memorystream mstream = new memorystream ();//Instantiate Memory stream     // Stream that links a data stream to a cryptographic transformation     cryptostream cstrEam = new cryptostream (Mstream, dcsp.createencryptor (RGBKEY,&NBSP;RGBIV), CryptoStreamMode.Write);     cstream.write (inputbytearray, 0,  Inputbytearray.length);     cstream.flushfinalblock ();    return  Convert.tobase64string (Mstream.toarray ());    }    catch     {        return encryptString;     }}/// <summary>/// des Decrypt String/// </summary>/// <param name= " Decryptstring "> String to Decrypt </param>/// <param name=" Decryptkey "> Decryption key, required to be 8-bit, same as encryption key </ Param>/// <returns> decryption successfully returns the decrypted string, failed to return to the source string </returns>public static string  Decryptdes (String decryptstring, string decryptkey) {    try     {    byte[] rgbkey = encodIng. UTF8. GetBytes (Decryptkey);     byte[] rgbiv = keys;    byte[]  inputbytearray = convert.frombase64string (decryptstring);     Descryptoserviceprovider dcsp = new descryptoserviceprovider ();     Memorystream mstream = new memorystream ();    cryptostream  Cstream = new cryptostream (MSTREAM,&NBSP;DCSP. CreateDecryptor (RGBKEY,&NBSP;RGBIV), cryptostreammode.write);     cstream.write ( Inputbytearray, 0, inputbytearray.length);     cstream.flushfinalblock ();     return encoding.utf8.getstring (Mstream.toarray ());    }     catch    {        return  decryptstring;    }}

4. Call method (at the end of the article, there are related classes, directly after the compilation call)

Returns the encrypted string encryptstrstring encryptstr = Encryptdesstring.encryptdes ("This is a Test", "password"); MessageBox.Show (ENCRYPTSTR);//Decrypt string encryptstrstring decryptstr = Encryptdesstring.decryptdes (EncryptStr, "password "); MessageBox.Show (ENCRYPTSTR);

After encryption:

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After decryption:

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This article is from the "World is the same" blog, please be sure to keep this source http://970076933.blog.51cto.com/9767314/1885616

C#des Encrypting and decrypting strings