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manjula-aw/AESEncryption.java

Created October 8, 2010 15:25
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  1. manjula-aw created this gist Oct 8, 2010.
    74 changes: 74 additions & 0 deletions AESEncryption.java
    View file
    Original file line number Diff line number Diff line change
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    import sun.misc.BASE64Encoder;
    import sun.misc.BASE64Decoder;

    import javax.crypto.Cipher;
    import javax.crypto.KeyGenerator;
    import javax.crypto.SecretKey;
    import javax.crypto.spec.SecretKeySpec;


    /**
    * Class for encrypting/decrypting texts using AES encryption
    * @author Manjula AW
    */
    public class AESEncryption {

    public static void main(String[] args) throws Exception {

    String messageToEncrypt = "test";
    System.out.println("Message to encrypt: " + messageToEncrypt);

    // KeyGenerator keygen = KeyGenerator.getInstance("AES");
    // keygen.init(128);
    // SecretKey skey = keygen.generateKey();
    // byte[] encKey = skey.getEncoded();
    byte[] encKey = new byte[]{-32, 74, 61, 28, -125, 118, -124, 85, 37, -23, 88, 110, 32, -76, -55, 74};

    String encrypted = encrypt(messageToEncrypt, encKey);
    System.out.println("Encrypted string: " + encrypted);

    String originalString = decrypt(encrypted, encKey);
    System.out.println("Original string: " + originalString);
    }

    /**
    * Encrypt given string <code>plainText</code> in AES encryption using the given key <code>rawkey</code>.
    * @param plainText string to be decrypted
    * @param rawkey encryption key
    * @return encrypted string
    * @throws Exception
    */
    public static String encrypt(String plainText, byte[] rawkey) throws Exception {
    try {
    SecretKeySpec skeySpec = new SecretKeySpec(rawkey, "AES");
    Cipher cipher = Cipher.getInstance("AES");
    cipher.init(Cipher.ENCRYPT_MODE, skeySpec);
    byte[] encrypted = cipher.doFinal((new BASE64Decoder()).decodeBuffer(plainText));
    return (new BASE64Encoder()).encode(encrypted);
    } catch (Exception e) {
    System.out.println(e.getLocalizedMessage());
    throw e;
    }
    }

    /**
    * Decrypt given AES encrypted string <code>encryptedText</code> using given key <code>rawkey</code>
    * @param encryptedText string to be decrypted
    * @param rawkey decryption key (same encryption key used to encrypt this text)
    * @return decrypted string
    * @throws Exception
    */
    public static String decrypt(String encryptedText, byte[] rawkey) throws Exception {
    try {
    SecretKeySpec skeySpec = new SecretKeySpec(rawkey, "AES");
    Cipher cipher = Cipher.getInstance("AES");
    cipher.init(Cipher.DECRYPT_MODE, skeySpec);
    byte[] decrypted = cipher.doFinal((new BASE64Decoder()).decodeBuffer(encryptedText));
    return (new BASE64Encoder()).encode(decrypted);
    } catch (Exception e) {
    System.out.println(e.getLocalizedMessage());
    throw e;
    }
    }
    }