How can I calculate the SHA -1 hash of a string with a secret key in Android? [closed]

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Currently I am working on SHA-1 Hash Algoritham can any one suggest me how can such algo be developed using the secret key?

Thanks :-)

Similar question : How can I calculate the SHA-256 hash of a string with a secret key in Android?.

Thanks.

Answer 1

Are you talking of a salt or something ? I think you'd like to use an encryption you can resverse such as AES.

  public static byte[] encrypt(String plainText, String encryptionKey) throws Exception   
  {
    Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding", "SunJCE");
    SecretKeySpec key = new SecretKeySpec(encryptionKey.getBytes("UTF-8"), "AES");
    cipher.init(Cipher.ENCRYPT_MODE, key,new IvParameterSpec(new byte[cipher.getBlockSize()]));
    return cipher.doFinal(plainText.getBytes("UTF-8"));
  }

  public static String decrypt(byte[] cipherText, String encryptionKey) throws Exception
  {
    Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding", "SunJCE");
    SecretKeySpec key = new SecretKeySpec(encryptionKey.getBytes("UTF-8"), "AES");
    cipher.init(Cipher.DECRYPT_MODE, key,new IvParameterSpec(new byte[cipher.getBlockSize()]));
    return new String(cipher.doFinal(cipherText),"UTF-8");
  }

A simple way to use it would be

String plaintext = "My plain text.";
String encryptionKey = "Super secret encryption key";
Log.d("AES", "Plain text is : " + plaintext );

byte[] cipher = encrypt(plaintext, encryptionKey);
Log.d("AES", "Encrypted string is : " + new String(cipher));

String decrypted = decrypt(cipher, encryptionKey);
Log.d("AES", "Decrypted string is : " + decrypted);

if (plaintext.equals(decrypted)) Log.d("AES", "Strings match !");