AES encryption for Java and. NET Interoperability

When AES encryption is used. If cross-platform issues are involved. The notification encounters an issue where. NET is inconsistent with the Java encryption results. A solution has been found to be recorded.

 public class Aeshelper {public static string Encry (string text, string key) {String IV = Ke            Y if (key. Length >) {//IV for Merchant MD5 key after 16-bit IV = key. Substring (key.                LENGTH-16); The key for RES is the first 16 bits key of the merchant MD5 key = key.            Substring (0, 16);        } return Encodeaes (text, KEY,IV); }///&LT;SUMMARY&GT;AES encryption </summary>//<param name= "text" > Clear text </param>///< param name= "key" > key, String length 16 </param>//<param Name= "IV" > Offset, String length 16 </param>//                /<returns> redaction </returns> public static string Encodeaes (string text, string key, String iv) {            RijndaelManaged rijndaelcipher = new RijndaelManaged ();            Rijndaelcipher.mode = CIPHERMODE.CBC;            rijndaelcipher.padding = PADDINGMODE.PKCS7;            rijndaelcipher.keysize = 128; Rijndaelcipher.blocksize = 128;            byte[] pwdbytes = System.Text.Encoding.UTF8.GetBytes (key);            byte[] keybytes = new BYTE[16];            int len = pwdbytes.length;            if (len > keybytes.length) len = keybytes.length;            System.Array.Copy (Pwdbytes, Keybytes, Len);            Rijndaelcipher.key = keybytes;            RIJNDAELCIPHER.IV = Encoding.UTF8.GetBytes (IV);            ICryptoTransform transform = Rijndaelcipher.createencryptor ();            byte[] plaintext = Encoding.UTF8.GetBytes (text); Byte[] Cipherbytes = transform.            TransformFinalBlock (plaintext, 0, plaintext.length);        Return convert.tobase64string (cipherbytes); }///<summary>aes decryption </summary>//<param name= "text" > redaction </param>//< param name= "key" > key, String length 16 </param>//<param Name= "IV" > Offset, String length 16 </param>// /<returns> Clear Text </returns> public static string Decodeaes (string text, string key, String iv) {RijndaelManaged rijndaelcipher = new Rijn            Daelmanaged ();            Rijndaelcipher.mode = CIPHERMODE.CBC;            rijndaelcipher.padding = PADDINGMODE.PKCS7;            rijndaelcipher.keysize = 128;            rijndaelcipher.blocksize = 128;            byte[] EncryptedData = convert.frombase64string (text);            byte[] pwdbytes = System.Text.Encoding.UTF8.GetBytes (key);            byte[] keybytes = new BYTE[16];            int len = pwdbytes.length;            if (len > keybytes.length) len = keybytes.length;            System.Array.Copy (Pwdbytes, Keybytes, Len);            Rijndaelcipher.key = keybytes;            RIJNDAELCIPHER.IV = Encoding.UTF8.GetBytes (IV);            ICryptoTransform transform = Rijndaelcipher.createdecryptor (); Byte[] plaintext = transform.            TransformFinalBlock (EncryptedData, 0, encrypteddata.length); Return Encoding.UTF8.GetString (plaintEXT); }    }

The following are Java code

public class Aesutil {//Encrypt public static string Encry (string content, String key) throws Exception {string IV = Key;if (ke  Y.length () >) {//IV for Merchant MD5 key after 16-bit IV = key.substring (Key.length ()-+);//Res key is the first 16-bit key of the merchant MD5 key = key.substring (0, 16);} Return EncryptData (content, key, IV);}  Encrypt public static string Desencry (string content, String key) throws Exception {string IV = Key;if (Key.length () > 16) {//IV is the merchant MD5 key after 16-bit IV = key.substring (Key.length ()-+);//Res key is the first 16-bit key for merchant MD5 keys = key.substring (0, 16);} Return Decryptdata (content, key, IV);} /** * AES Encryption * * @param data * @return */public static string EncryptData (string data, String key, String IV) throws Excep tion {try {Cipher Cipher = cipher.getinstance ("aes/cbc/pkcs5padding"); byte[] databytes = data.getbytes ("UTF-8"); int Plaintextlength = databytes.length;//if (plaintextlength% blockSize! = 0) {//Plaintextlength = Plaintextlength + (block Size-(plaintextlength//% blockSize));//}byte[] plaintext = new Byte[plaintextleNgth]; System.arraycopy (databytes, 0, plaintext, 0, databytes.length); Secretkeyspec Keyspec = new Secretkeyspec (Key.getbytes (), "AES"), ivparameterspec ivspec = new Ivparameterspec ( Iv.getbytes ()); Cipher.init (Cipher.encrypt_mode, Keyspec, Ivspec); byte[] encrypted = cipher.dofinal (plaintext); return new String (Base64.encodebase64 (encrypted));} catch (Exception e) {throw e;}} /** * AES Decryption * * @param data * ciphertext * @return */public static string Decryptdata (string data, string key, String IV) throws Exception {try {byte[] encrypted1 = base64.decodebase64 (Data.getbytes ("UTF-8")); Cipher Cipher = cipher.getinstance ("aes/cbc/pkcs5padding"); Secretkeyspec Keyspec = new Secretkeyspec (Key.getbytes (), "AES"), ivparameterspec ivspec = new Ivparameterspec ( Iv.getbytes ()); Cipher.init (Cipher.decrypt_mode, Keyspec, Ivspec); byte[] Original = cipher.dofinal (encrypted1); String originalstring = new String (Original, "UTF-8"); return originalstring;} catch (Exception e) {throw e;}} public static void Main (STRIng[] args) throws Exception {String a = encry ("Test Electronics Co., Ltd.", "XJQ4RSY0ZCO937VK7VDRZFD7R40RQ5PG"); System.out.println (a);}}

　　

AES encryption for Java and. NET Interoperability