Algorithms

AESByRaghu.java

 package AES;

import java.security.MessageDigest;

import java.security.NoSuchAlgorithmException;

import java.util.Arrays;

import javax.crypto.Cipher;

import javax.crypto.spec.SecretKeySpec;

public class AESByRaghu {

                private static SecretKeySpec securityKey;

                private static byte[] actualKey;

                public static void setKeyData(String myKey) {

                                MessageDigest sha_1 = null;

                                try {

                                                actualKey = myKey.getBytes();

                                                sha_1 = MessageDigest.getInstance("SHA-1");

                                                actualKey = sha_1.digest(actualKey);

                                                actualKey = Arrays.copyOf(actualKey, 16);

                                                securityKey = new SecretKeySpec(actualKey, "AES");

                                } catch (NoSuchAlgorithmException e) {

                                                e.printStackTrace();

                                }

                }

                public static String encryptInput(String normalStr, String secretKey) {

                                try {

                                                setKeyData(secretKey);

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

                                                cipher.init(Cipher.ENCRYPT_MODE, securityKey);

                                                return new String(cipher.doFinal(normalStr.getBytes()));

                                } catch (Exception e) {

                                                e.printStackTrace();

                                }

                                return null;

                }

                public static String decryptInput(String encryptedStr, String secret) {

                                try {

                                                setKeyData(secret);

                                                Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5PADDING");

                                                cipher.init(Cipher.DECRYPT_MODE, securityKey);

                                                return new String(cipher.doFinal(encryptedStr.getBytes()));

                                } catch (Exception e) {

                                                e.printStackTrace();

                                }

                                return null;

                }

                public static void main(String[] srs) {

                                final String samplKey = "itisnotpassword!!";

                                String actualStr = "javabyraghu@gmail.com";

                                String encryptedString = encryptInput(actualStr, samplKey);

                                String decryptedString = decryptInput(encryptedString, samplKey);

                                System.out.println(actualStr);

                                System.out.println(encryptedString);

                                System.out.println(decryptedString);

                }

}

o/p:-

javabyraghu@gmail.com

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javabyraghu@gmail.com