Java. Реализация Triple DES (DESede) в режиме CBC с вектором инициализации

Triple DES - ни что иное, как продолжение знаменитого алгоритма DES  c тройным шифрованием - отсюда и triple.

В интернете очень сложно найти готовую реализацию triple des + cbc + initialization vector.

public class TripleDesTester { public static void main(String[] args) { // Вектор инициализации, необходимый для Triple DES byte[] initializationVector = { 0x12, 0x34, 0x56, 0x78, (byte) 0x90, (byte) 0xAB, (byte) 0xCD, (byte) 0xEF }; // Тестовый ключ ( должен быть 24 байта\192 бита ) byte[] encryptedClientRandom = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }; // Тестовые данные для шифрования byte[] testData = { 0x54, 0x68, 0x69, 0x73, 0x54, 0x68, 0x69, 0x73 }; try { TripleDes desEncTest = new TripleDes(initializationVector); desEncTest.setKey(encryptedClientRandom); desEncTest.encrypt(testData); byte[] testRes = desEncTest.getResult(); // Получаем результат шифрования. System.out.println("KEY:" + ConvertionUtils.getHexString(encryptedClientRandom)); System.out.println("STR:" + ConvertionUtils.getHexString(testData)); System.out.println("ENC:" + ConvertionUtils.getHexString(testRes)); } catch (Exception e) { e.printStackTrace(); } } }

ConvertionUtils.getHexString() - это просто метод для вывода массива байтов в шестнадцатиричном виде.

Этот пример использует класс TripleDes, который приведен ниже.

import java.io.FileInputStream; import java.io.FileOutputStream; import java.security.InvalidAlgorithmParameterException; import java.security.InvalidKeyException; import java.security.NoSuchAlgorithmException; import java.security.spec.AlgorithmParameterSpec; import java.security.spec.InvalidKeySpecException; import javax.crypto.BadPaddingException; import javax.crypto.Cipher; import javax.crypto.IllegalBlockSizeException; import javax.crypto.NoSuchPaddingException; import javax.crypto.SecretKey; import javax.crypto.SecretKeyFactory; import javax.crypto.spec.DESedeKeySpec; import javax.crypto.spec.IvParameterSpec; public class TripleDes { private byte[] m_IV = null; private byte[] result = null; private Cipher desEdeCipher = null; private SecretKey desEdeKey = null; private static SecretKeyFactory secretKeyFactory = null; private Object localObject = null; public TripleDes() throws NoSuchAlgorithmException, NoSuchPaddingException { try { if (secretKeyFactory == null) { secretKeyFactory = SecretKeyFactory.getInstance("DESede"); } if (this.desEdeCipher == null) this.desEdeCipher = Cipher.getInstance("DESede/ECB/NoPadding"); } catch (NoSuchAlgorithmException localNoSuchAlgorithmException) { System.out .println("ERROR: SecretKeyFactory.getInstance(\"DESede\") failed"); throw localNoSuchAlgorithmException; } catch (NoSuchPaddingException localNoSuchPaddingException) { System.out .println("ERROR: Cipher.getInstance(\"DESede/ECB/NoPadding\") failed"); throw localNoSuchPaddingException; } } public TripleDes(byte[] paramArrayOfByte) throws NoSuchAlgorithmException, NoSuchPaddingException { try { if (secretKeyFactory == null) { secretKeyFactory = SecretKeyFactory.getInstance("DESede"); } if (this.desEdeCipher == null) { this.desEdeCipher = Cipher.getInstance("DESede/CBC/NoPadding"); } this.m_IV = paramArrayOfByte; } catch (NoSuchAlgorithmException localNoSuchAlgorithmException) { System.out .println("ERROR: SecretKeyFactory.getInstance(\"DESede\") failed"); throw localNoSuchAlgorithmException; } catch (NoSuchPaddingException localNoSuchPaddingException) { System.out .println("ERROR: Cipher.getInstance(\"DESede/CBC/PKCS5Padding\") failed"); throw localNoSuchPaddingException; } } public void setKey(byte[] paramArrayOfByte) throws InvalidKeyException, InvalidKeySpecException { if ((paramArrayOfByte.length == 0) || (paramArrayOfByte.length > 24)) { System.out.println("ERROR: Key must be 1 to 8 bytes long"); throw new InvalidKeyException(); } DESedeKeySpec localDESedeKeySpec = new DESedeKeySpec(paramArrayOfByte, 0); this.desEdeKey = secretKeyFactory.generateSecret(localDESedeKeySpec); } public void setIV(byte[] paramArrayOfByte) throws InvalidKeyException, InvalidKeySpecException { if ((paramArrayOfByte != null) && (paramArrayOfByte.length != 8)) { System.out.println("ERROR: IV must be 8 bytes long"); throw new InvalidKeyException(); } this.m_IV = paramArrayOfByte; } public void encrypt(byte[] paramArrayOfByte) throws InvalidKeyException, BadPaddingException, IllegalBlockSizeException, InvalidAlgorithmParameterException, Exception { if (this.desEdeKey == null) { System.out .println("ERROR: You must set a key before calling encrypt()"); throw new InvalidKeyException(); } if (this.m_IV != null) { IvParameterSpec localIvParameterSpec = new IvParameterSpec( this.m_IV); this.desEdeCipher.init(1, this.desEdeKey, localIvParameterSpec); } else { this.desEdeCipher.init(1, this.desEdeKey); } int i = (paramArrayOfByte.length % 8 > 0) ? paramArrayOfByte.length + 8 - (paramArrayOfByte.length % 8) : paramArrayOfByte.length; byte[] arrayOfByte = new byte[i]; System.arraycopy(paramArrayOfByte, 0, arrayOfByte, 0, paramArrayOfByte.length); this.result = this.desEdeCipher.doFinal(arrayOfByte); } public void decrypt(byte[] paramArrayOfByte) throws InvalidKeyException, BadPaddingException, IllegalBlockSizeException, InvalidAlgorithmParameterException, Exception { if (this.desEdeKey == null) { System.out .println("ERROR: You must set a key before calling decrypt()"); throw new InvalidKeyException(); } if (this.m_IV != null) { IvParameterSpec localIvParameterSpec = new IvParameterSpec( this.m_IV); this.desEdeCipher.init(2, this.desEdeKey, localIvParameterSpec); } else { this.desEdeCipher.init(2, this.desEdeKey); } this.result = this.desEdeCipher.doFinal(paramArrayOfByte); } public byte[] getResult() { return this.result; } public void encryptFile(String paramString1, String paramString2) { try { FileInputStream localFileInputStream = new FileInputStream( paramString1); byte[] arrayOfByte = new byte[localFileInputStream.available()]; localFileInputStream.read(arrayOfByte, 0, localFileInputStream .available()); localFileInputStream.close(); encrypt(arrayOfByte); if ((paramString2 == null) || (paramString2.length() == 0)) { return; } FileOutputStream localFileOutputStream = new FileOutputStream( paramString2); localFileOutputStream.write(this.result, 0, this.result.length); localFileOutputStream.close(); } catch (Exception localException) { } } public void decryptFile(String paramString1, String paramString2) throws Exception { try { FileInputStream localFileInputStream = new FileInputStream( paramString1); byte[] arrayOfByte = new byte[localFileInputStream.available()]; localFileInputStream.read(arrayOfByte, 0, localFileInputStream .available()); localFileInputStream.close(); decrypt(arrayOfByte); if ((paramString2 == null) || (paramString2.length() == 0)) { return; } FileOutputStream localFileOutputStream = new FileOutputStream( paramString2); localFileOutputStream.write(this.result, 0, this.result.length); localFileOutputStream.close(); } catch (Exception localException) { throw localException; } } public void encryptText(String paramString) throws InvalidKeyException, BadPaddingException, IllegalBlockSizeException, Exception { if (this.desEdeKey == null) { System.out .println("ERROR: You must set a key before calling encrypt()"); throw new InvalidKeyException(); } if (this.m_IV != null) { localObject = new IvParameterSpec(this.m_IV); this.desEdeCipher.init(1, this.desEdeKey, (AlgorithmParameterSpec) localObject); } else { this.desEdeCipher.init(1, this.desEdeKey); } byte[] localObject = paramString.getBytes(); int i = (localObject.length % 8 > 0) ? localObject.length + 8 - (localObject.length % 8) : localObject.length; byte[] arrayOfByte = new byte[i]; System.arraycopy(localObject, 0, arrayOfByte, 0, localObject.length); this.result = this.desEdeCipher.doFinal(arrayOfByte); } public void encryptTextU(String paramString) throws InvalidKeyException, BadPaddingException, IllegalBlockSizeException, Exception { if (this.desEdeKey == null) { System.out .println("ERROR: You must set a key before calling encrypt()"); throw new InvalidKeyException(); } if (this.m_IV != null) { localObject = new IvParameterSpec(this.m_IV); this.desEdeCipher.init(1, this.desEdeKey, (AlgorithmParameterSpec) localObject); } else { this.desEdeCipher.init(1, this.desEdeKey); } byte[] localObject = paramString.getBytes("UTF-16LE"); int i = (localObject.length % 8 > 0) ? localObject.length + 8 - (localObject.length % 8) : localObject.length; byte[] arrayOfByte = new byte[i]; System.arraycopy(localObject, 0, arrayOfByte, 0, localObject.length); this.result = this.desEdeCipher.doFinal(arrayOfByte); } public String decryptText(byte[] paramArrayOfByte) throws InvalidKeyException, BadPaddingException, IllegalBlockSizeException, Exception { if (this.desEdeKey == null) { System.out .println("ERROR: You must set a key before calling decrypt()"); throw new InvalidKeyException(); } if (this.m_IV != null) { localObject = new IvParameterSpec(this.m_IV); this.desEdeCipher.init(2, this.desEdeKey, (AlgorithmParameterSpec) localObject); } else { this.desEdeCipher.init(2, this.desEdeKey); } this.result = this.desEdeCipher.doFinal(paramArrayOfByte); Object localObject = new String(this.result).trim(); return ((String) localObject); } public String decryptTextU(byte[] paramArrayOfByte) throws InvalidKeyException, BadPaddingException, IllegalBlockSizeException, Exception { if (this.desEdeKey == null) { System.out .println("ERROR: You must set a key before calling decrypt()"); throw new InvalidKeyException(); } if (this.m_IV != null) { localObject = new IvParameterSpec(this.m_IV); this.desEdeCipher.init(2, this.desEdeKey, (AlgorithmParameterSpec) localObject); } else { this.desEdeCipher.init(2, this.desEdeKey); } this.result = this.desEdeCipher.doFinal(paramArrayOfByte); Object localObject = new String(this.result, "UTF-16LE").trim(); return ((String) localObject); } }