DES/ECB encryption and decryption algorithm

The java version and the C# version can encrypt and decrypt each other.

Among them, PasswordUtil.java and PasswordUtil.cs can encrypt and decrypt each other.

DesUtil.java and DesUtil.cs can encrypt and decrypt each other.

 

1. The following two encryption methods are the same

method one:

Security.addProvider(new com.sun.crypto.provider.SunJCE());
byte[] arrB = new byte[8];
// Convert raw byte array to 8 bits
for (int i = 0; i < key.getBytes().length && i < arrB.length; i++) {
    arrB[i] = key.getBytes()[i];
}
// generate key
Key desKey = new javax.crypto.spec.SecretKeySpec(arrB, "DES");
Cipher encryptCipher = Cipher.getInstance("DES");
encryptCipher.init(Cipher.ENCRYPT_MODE, desKey);
byte[] resultByte = encryptCipher.doFinal(message.getBytes());

2. Method 2:

            Cipher cipher = Cipher.getInstance("DES");

            byte[] arrBTmp = key.getBytes();

            byte[] arrB = new byte[8];

 

            // Convert raw byte array to 8 bits

            for (int i = 0; i < arrBTmp.length && i < arrB.length; i++) {

                arrB [i] = arrBTmp [i];

            }

            DESKeySpec desKeySpec = new DESKeySpec(arrB);

            SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");

            SecretKey secretKey = keyFactory.generateSecret(desKeySpec);

            cipher.init(Cipher.ENCRYPT_MODE, secretKey);

            byte[] encodeByte = cipher.doFinal(message.getBytes());