Skip to content

Instantly share code, notes, and snippets.

@jay7793

jay7793/aes.java

Last active August 26, 2018 14:55
Show Gist options

  • Select an option

    Learn more about clone URLs
  • Save jay7793/5f790e71c33834fba62c274d22d5fcbf to your computer and use it in GitHub Desktop.

Select an option

Learn more about clone URLs
Save jay7793/5f790e71c33834fba62c274d22d5fcbf to your computer and use it in GitHub Desktop.
Download ZIP

Revisions

  1. jay7793 revised this gist Aug 26, 2018. 1 changed file with 1 addition and 1 deletion.
    2 changes: 1 addition & 1 deletion aes.java
    View file
    Original file line number Diff line number Diff line change
    @@ -109,7 +109,7 @@ public static String decrypt(String strToDecrypt) {
    public static void main(String args[]) {

    final String strToEncrypt = "My text to encrypt";
    final String strPssword = "encryptor key";
    final String strPssword = "secret key";
    AES.setKey(strPssword);

    AES.encrypt(strToEncrypt.trim());
  2. jay7793 created this gist Aug 26, 2018.
    128 changes: 128 additions & 0 deletions aes.java
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,128 @@
    import java.io.UnsupportedEncodingException;
    import java.security.MessageDigest;
    import java.security.NoSuchAlgorithmException;
    import java.security.SecureRandom;
    import java.security.spec.AlgorithmParameterSpec;
    import java.security.spec.InvalidKeySpecException;
    import java.security.spec.KeySpec;
    import java.util.Arrays;

    import javax.crypto.Cipher;
    import javax.crypto.SecretKey;
    import javax.crypto.SecretKeyFactory;
    import javax.crypto.spec.IvParameterSpec;
    import javax.crypto.spec.PBEKeySpec;
    import javax.crypto.spec.SecretKeySpec;
    import javax.print.DocFlavor.STRING;

    import org.apache.commons.codec.binary.Base64;



    public class AES {


    private static SecretKeySpec secretKey;
    private static byte[] key;

    private static String decryptedString;
    private static String encryptedString;


    public static void setKey(String myKey) {


    MessageDigest sha = null;
    try {
    key = myKey.getBytes("UTF-8");
    System.out.println(key.length);
    sha = MessageDigest.getInstance("SHA-1");
    key = sha.digest(key);
    key = Arrays.copyOf(key, 16); // use only first 128 bit
    System.out.println(key.length);
    System.out.println(new String(key, "UTF-8"));
    secretKey = new SecretKeySpec(key, "AES");


    } catch (NoSuchAlgorithmException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
    } catch (UnsupportedEncodingException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
    }




    }

    public static String getDecryptedString() {
    return decryptedString;
    }

    public static void setDecryptedString(String decryptedString) {
    AES.decryptedString = decryptedString;
    }

    public static String getEncryptedString() {
    return encryptedString;
    }

    public static void setEncryptedString(String encryptedString) {
    AES.encryptedString = encryptedString;
    }

    public static String encrypt(String strToEncrypt) {
    try {
    Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");

    cipher.init(Cipher.ENCRYPT_MODE, secretKey);


    setEncryptedString(Base64.encodeBase64String(cipher.doFinal(strToEncrypt.getBytes("UTF-8"))));

    } catch (Exception e) {

    System.out.println("Error while encrypting: " + e.toString());
    }
    return null;

    }

    public static String decrypt(String strToDecrypt) {
    try {
    Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5PADDING");

    cipher.init(Cipher.DECRYPT_MODE, secretKey);
    setDecryptedString(new String(cipher.doFinal(Base64.decodeBase64(strToDecrypt))));

    } catch (Exception e) {

    System.out.println("Error while decrypting: " + e.toString());

    }
    return null;
    }


    public static void main(String args[]) {

    final String strToEncrypt = "My text to encrypt";
    final String strPssword = "encryptor key";
    AES.setKey(strPssword);

    AES.encrypt(strToEncrypt.trim());

    System.out.println("String to Encrypt: " + strToEncrypt);
    System.out.println("Encrypted: " + AES.getEncryptedString());

    final String strToDecrypt = AES.getEncryptedString();
    AES.decrypt(strToDecrypt.trim());

    System.out.println("String To Decrypt : " + strToDecrypt);
    System.out.println("Decrypted : " + AES.getDecryptedString());

    }

    }