C # RC4 algorithm, cryptographic decryption class

RC4.

1 /*2 * Created by SharpDevelop. 3 * User: Yish4 * Date: 04/04/20155 * Time: 03:016  * 7 * To change this template click Tools | options | code Writing | Edit Standard header file8  */9 usingSystem;Ten  One namespaceLibraries A { -     /// <summary> -     ///Description of cryptography. the     /// </summary> -      Public classrc4crypt:idisposable{ -         byte[] S; -         byte[] T; +         byte[] K; -         byte[] k; +          PublicRc4crypt () {} A          PublicRc4crypt (byte[] key) { at              This. k=key; -         } -          Public byte[] Key -         { -             Get -             { in                 returnK; -             } to             Set +             { -K =value; the             } *         } $         //initializes the state vector s and temporary vector T for Keystream method invocationPanax Notoginseng         voidInitial () { -             if(S = =NULL|| T = =NULL) the             { +S =New byte[ the]; AT =New byte[ the]; the             } +              for(inti =0; I < the; ++i) { -S[i]= (byte) I; $T[i] = k[i%K.length]; $             } -         } -         //initial permutation state vector s, for Keystream method invocation the         voidranges () { -             intj=0;Wuyi              for(inti =0; I < the; ++i) { theJ= (J+s[i]+t[i]) &0xFF; -S[i]= (byte) ((S[i]+s[j]) &0xFF); WuS[j]= (byte) ((S[i]-s[j]) &0xFF); -S[i]= (byte) ((S[i]-s[j]) &0xFF); About             } $         } -         //generate a key stream -         //len: Len bytes for clear text -         voidKeystream (intLen) { A initial (); + ranges (); the             intI=0, j=0, t=0; -k=New byte[Len]; $              for(intR =0; R < Len; r++) { theI= (i+1) &0xFF; theJ= (J+s[i]) &0xFF; the                  theS[i]= (byte) ((S[i]+s[j]) &0xFF); -S[j]= (byte) ((S[i]-s[j]) &0xFF); inS[i]= (byte) ((S[i]-s[j]) &0xFF); the                  theT= (S[i]+s[j]) &0xFF; Aboutk[r]=S[t]; the             } the         } the          +          Public byte[] Encryptbyte (byte[] data) { -             //Production Key Stream the keystream (data. Length);Bayi              for(inti =0; I < data. Length; i++) { theK[i]= (byte) (data[i]^k[i]); the             } -             returnK; -         } the  the          Public byte[] Decryptbyte (byte[] data) { the             returnencryptbyte (data); the         } -  the         //is the collection complete ? the         BOOL_disposed; the          Public voidDispose ()94         { theDispose (true); theGc. SuppressFinalize ( This); the         }98~Rc4crypt () About         { -Dispose (false);101         }102         //The parameters here indicate whether the managed objects that implement the IDisposable interface need to be freed103         protected Virtual voidDispose (BOOLdisposing)104         { the             if(_disposed)return;//If it has been recycled, the execution is interrupted.106             if(disposing)107             {108                 //TODO: Releasing managed objects that implement the IDisposable interface109  the             }111             //TODO: Dispose of unmanaged resources, set object to null theS =NULL;113T =NULL; theK =NULL; theK =NULL; the_disposed =true;117         }118     }119}

C # RC4 algorithm, cryptographic decryption class