Simple C #. Net string encryption and decryption program

Yesterday, the South Korean headquarters conducted a security review on the website, and we saw that many link strings were not encrypted. I criticized them.

To encrypt and decrypt the previously used stringProgramI used it out and shared it by the way. I hope to help my friends who need it:

EncryptionAlgorithmWhen 3DES is used, the key has been hashed by MD5, And the strength should meet general requirements,CodeVery few, very convenient:

Using System;
Using System. Collections. Generic;
Using System. text;
Using System. Security. cryptography;

Namespace Nop. Security
{
Public   Class Encrypt
{
Public   Static   String Decryptstring ( String Strtext, String Key)
{
Byte [] Buffer =   New Md5cryptoserviceprovider (). computehash (encoding. ASCII. getbytes (key ));
Tripledescryptoserviceprovider =   New Tripledescryptoserviceprovider ();
Provider. Key = Buffer;
Provider. Mode = Ciphermode. ECB;
Byte [] Inputbuffer = Convert. frombase64string (strtext );
Return Encoding. ASCII. getstring (provider. createdecryptor (). transformfinalblock (inputbuffer, 0 , Inputbuffer. Length ));
}

Public   Static   String Decryptutf8string ( String Strtext, String Key)
{
Byte [] Buffer =   New Md5cryptoserviceprovider (). computehash (encoding. utf8.getbytes (key ));
Tripledescryptoserviceprovider =   New Tripledescryptoserviceprovider ();
Provider. Key = Buffer;
Provider. Mode = Ciphermode. ECB;
Byte [] Inputbuffer = Convert. frombase64string (strtext );
Return Encoding. utf8.getstring (provider. createdecryptor (). transformfinalblock (inputbuffer, 0 , Inputbuffer. Length ));
}

Public   Static   String Encryptstring ( String Strtext, String Key)
{
Byte [] Buffer =   New Md5cryptoserviceprovider (). computehash (encoding. ASCII. getbytes (key ));
Tripledescryptoserviceprovider =   New Tripledescryptoserviceprovider ();
Provider. Key = Buffer;
Provider. Mode = Ciphermode. ECB;
Byte [] Bytes = Encoding. ASCII. getbytes (strtext );
String Str = Convert. tobase64string (provider. createencryptor (). transformfinalblock (bytes, 0 , Bytes. Length ));
Provider =   Null ;
Return STR;
}

Public   Static   String Encryptutf8string ( String Strtext, String Key)
{
Byte [] Buffer =   New Md5cryptoserviceprovider (). computehash (encoding. utf8.getbytes (key ));
Tripledescryptoserviceprovider =   New Tripledescryptoserviceprovider ();
Provider. Key = Buffer;
Provider. Mode = Ciphermode. ECB;
Byte [] Bytes = Encoding. utf8.getbytes (strtext );
String Str = Convert. tobase64string (provider. createencryptor (). transformfinalblock (bytes, 0 , Bytes. Length ));
Provider =   Null ;
Return STR;
}
}

}