sampleEcryption.java

public class SampleEncryption {

    private final String securityKey = "YOUR_PRIVATE_SECURITY_KEY_HERE";

    public String Decrypt(String cipherString) {
        try {
            MessageDigest md = MessageDigest.getInstance("MD5");
            final byte[] digestOfPassword = md.digest(securityKey.getBytes("utf-8"));
            final byte[] keyArray = Arrays.copyOf(digestOfPassword, 24);
            for (int j = 0, k = 16; j < 8; ) {
                keyArray[k++] = keyArray[j++];
            }
            SecretKeySpec key = new SecretKeySpec(keyArray, "DESede");
            Cipher c = Cipher.getInstance("DESede/ECB/PKCS5Padding");
            c.init(Cipher.DECRYPT_MODE, key);

            byte[] toDecryptArray = Base64.getDecoder().decode(cipherString);
            byte[] decryptedValue = c.doFinal(toDecryptArray);
            return new String(decryptedValue);
        } catch (Exception e) {
            log.error("Decryption failed due to ", e);
            return null;
        }
    }

    public String Encrypt(String cipherString) {
        try {
            MessageDigest md = MessageDigest.getInstance("MD5");
            final byte[] digestOfPassword = md.digest(securityKey.getBytes("utf-8"));
            final byte[] keyArray = Arrays.copyOf(digestOfPassword, 24);
            for (int j = 0, k = 16; j < 8; ) {
                keyArray[k++] = keyArray[j++];
            }
            SecretKeySpec key = new SecretKeySpec(keyArray, "DESede");
            Cipher c = Cipher.getInstance("DESede/ECB/PKCS5Padding");
            c.init(Cipher.ENCRYPT_MODE, key);

            byte[] toEncryptArray = cipherString.getBytes("utf-8");
            byte[] encryptedText = c.doFinal(toEncryptArray);
            return new String(Base64.getEncoder().encode(encryptedText));
        } catch (Exception e) {
            log.error("Encryption failed due to ", e);
            return null;
        }
    }
}