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javaencryptiondes

DESede Decrypt Issue

I am trying to understand some legacy code where one of the parameter to Cipher.init is 2. What does 2 signify here?

try
{
    if (key == null)
    {
        key = SecretKeyFactory.getInstance("DESede").generateSecret(new DESedeKeySpec(keyBytes));
    }

    Cipher cipher = Cipher.getInstance("DESede");
    cipher.init(2, key);
}
Solution

  • What does 2 signify here?

    That's opmode. From Cipher class Javadocs:

    void init(int opmode, Key key)

    I believe 2 is DECRYPT_MODE. See the Constant Field Values at the bottom of the page.