How to do Encryption and Decryption for plain text/password in JAVA

Java code for Encryption and Decryption of plain text. In below code encrypting plain text encrypted by using Key by algorithm “AES/ECB/PKCS5Padding“ and Decryption again in plain text.

Pre-Requisite :

  • Java 7 or 8
import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;
public class EncryptionDecryption {

	public static void main(String[] args) throws Exception {
	    byte[] input = "".getBytes();
	    byte[] keyBytes = new byte[] { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09,
	        0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f };

	    SecretKeySpec key = new SecretKeySpec(keyBytes, "AES");

	    Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");

	    System.out.println(new String(input));

	    // Encryption pass
	    cipher.init(Cipher.ENCRYPT_MODE, key);

	    byte[] cipherText = new byte[cipher.getOutputSize(input.length)];
	    int ctLength = cipher.update(input, 0, input.length, cipherText, 0);
	    ctLength += cipher.doFinal(cipherText, ctLength);
	    System.out.println(new String(cipherText));

	    // Decryption pass
	    cipher.init(Cipher.DECRYPT_MODE, key);
	    byte[] plainText = new byte[cipher.getOutputSize(ctLength)];
	    int ptLength = cipher.update(cipherText, 0, ctLength, plainText, 0);
	    ptLength += cipher.doFinal(plainText, ptLength);
	    System.out.println(new String(plainText));


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