3DES Encryption Algorithm 32 bytes

Brief introduction

Recently developed a project, using the 3DES encryption algorithm, encrypt the socket server and client communication messages, because the encryption key is 32 bytes, the result is a toss, and now recorded to share!

1, Des3encryptutils.java

 PackageDes3;ImportJavax.crypto.Cipher;ImportJavax.crypto.SecretKey;Importjavax.crypto.SecretKeyFactory;ImportJavax.crypto.spec.DESedeKeySpec;/*** 3DES Encryption Tool class *@authorQiaozhenwu*/ Public classDes3encryptutils {/**secret key*/    PrivateSecretkey SecureKey; /*** Function: The key in the algorithm needs to be encrypted by a byte array of keys *@paramthe byte array of the key secret key*/     Public voidSetkey (byte[] key) {        Try{desedekeyspec DKs=NewDesedekeyspec (key); Secretkeyfactory keyfactory= Secretkeyfactory.getinstance ("Desede"); SecureKey=Keyfactory.generatesecret (DKS); } Catch(Exception e) {System.out.println (E.getmessage ()); }    }    /*** Function: Encrypt the plaintext *@paramByteS byte array corresponding to plaintext *@returnbyte array corresponding to ciphertext*/     Public byte[] Get3desenccode (byte[] ByteS) {        byte[] Bytefina =NULL;        Cipher Cipher; Try{cipher= Cipher.getinstance ("desede/ecb/nopadding");//algorithm/grouping mode/fill modeCipher.init (Cipher.encrypt_mode, SecureKey); Bytefina=cipher.dofinal (ByteS); } Catch(Exception e) {System.out.println (E.getmessage ()); } finally{cipher=NULL; }        returnBytefina; }    /*** Function: Decryption of ciphertext *@parambyted byte array corresponding to ciphertext *@returnbyte array corresponding to clear text*/     Public byte[] Get3desdescode (byte[] byted)        {Cipher Cipher; byte[] Bytefina =NULL; Try{cipher= Cipher.getinstance ("desede/ecb/nopadding");            Cipher.init (Cipher.decrypt_mode, SecureKey); Bytefina=cipher.dofinal (byted); } Catch(Exception e) {System.out.println (E.getmessage ()); } finally{cipher=NULL; }        returnBytefina; }}

2, Hexutils.java

 PackageDes3;/*** Hex Helper class *@authorJacky*/ Public classHexutils {/**converting Data*/    Private Static Final Char[] hexdigits = {' 0 ', ' 1 ', ' 2 ', ' 3 ', ' 4 ', ' 5 ', ' 6 ', ' 7 ', ' 8 ', ' 9 ', ' A ', ' B ', ' C ', ' D ', ' E ', ' F ' }; /*** ToString (controls the length of the conversion of byte[] to the corresponding hexadecimal string representation)*/     Public StaticString toString (byte[] BA,intOffsetintlength) {        Char[] buf =New Char[Length * 2]; intj = 0; intK;  for(inti = offset; I < offset + length; i++) {k=Ba[i]; Buf[j+ +] = hexdigits[(k >>> 4) & 0x0F]; Buf[j+ +] = hexdigits[k & 0x0F]; }        return NewString (BUF); }    /*** Function: Convert byte[] to the corresponding hexadecimal string *@paramba byte array *@returnhexadecimal string*/     Public StaticString toString (byte[] ba) {        returnToString (BA, 0, ba.length); }    /*** Function: Convert hexadecimal string to byte array *@paramhex hexadecimal String *@returnbyte array*/     Public Static byte[] fromstring (String hex) {intLen =hex.length (); byte[] buf =New byte[(len + 1)/2]; inti = 0; intj = 0; if(len% 2) = = 1) {buf[j++] = (byte) Fromdigit (Hex.charat (i++)); }         while(I <Len) {Buf[j++] = (byte) ((Fromdigit (Hex.charat (i++) << 4) | Fromdigit (Hex.charat (i++))); }        returnbuf; }    /*** Fromdigit (converts hexadecimal char to decimal int value)*/     Public Static intFromdigit (Charch) {        if(Ch >= ' 0 ' && ch <= ' 9 ') {            returnCH-' 0 '; }        if(Ch >= ' A ' && ch <= ' F ') {            returnCH-' A ' + 10; }        if(Ch >= ' a ' && ch <= ' F ') {            returnCH-' A ' + 10; }        Throw NewIllegalArgumentException ("Invalid hex digit" + ch + "'"); }}

3, Des3utils.java

 PackageDes3;/*** 3DES decryption main class, plus decryption calls internal method *@authorQiaozhenwu **/ Public classDes3utils {/*** Dec: (decryption). * @paramKey Key *@paramcontent redaction 16-bit *@returnreturn Result: String*/     Public Staticstring decryption (string key, string content) {Des3encryptutils des=Newdes3encryptutils (); String Enkey= "";//final decryption secret key 48 bitString encontent = "";//Decrypt Content        if(Key.length () <= 32) {Enkey= (key + key). substring (0, 48); }Else if(Key.length () >= 48) {Enkey= key.substring (0, 48); }        if(content.length () = = 16) {encontent=content; }Else{          if(Content.length () > 16){              Throw NewRuntimeException ("The Encrypt content length more than 16"); }Else if(Content.length () < 16){              Throw NewRuntimeException ("The Encrypt content length less than 16");        }} des.setkey (Enkey.getbytes ()); byte[] Get3desdescode =Des.get3desdescode (hexutils.fromstring (encontent)); returnhexutils.tostring (Get3desdescode). Trim (); }            /*** Dec: (encrypted). * @paramKey Key *@paramcontent plaintext contents are 16-bit hexadecimal strings *@returnreturn Result: String*/     Public Staticstring encryption (string key, string content) {Des3encryptutils des=Newdes3encryptutils (); String Enkey= "";//final encryption key 48 bitString encontent = "";//Encrypt content        if(Key.length () <= 32) {Enkey= (key + key). substring (0, 48); }Else if(Key.length () >= 48) {Enkey= key.substring (0, 48); }        if(content.length () = = 16) {encontent=content; }Else{          if(Content.length () > 16){              Throw NewRuntimeException ("The Encrypt content length more than 16"); }Else if(Content.length () < 16){              Throw NewRuntimeException ("The Encrypt content length less than 16");        }} des.setkey (Enkey.getbytes ()); byte[] bye =Des.get3desenccode (hexutils.fromstring (encontent)); returnhexutils.tostring (bye). Trim (); }         Public Static voidMain (string[] args) {String str= Encryption ("12345678123456781234567812345678", "06111111FFFFFFFF"); System.out.println ("Encrypted ciphertext is =====" +str); }}

3DES Encryption Algorithm 32 bytes