Encrypt Decrypt Vb6 Source Code
Encrypt Decrypt Vb6 Source Code Free

Details: Written by Nam Ha Minh; Last Updated on 02 July 2019 | Print Email

The following Visual Basic project contains the source code and Visual Basic examples used for encrypt/decrypt string. Download edrawings for mac os. Custom String Encoding VB6 or VB.net - VB.NET Hacks and Cheats Forum.

Encryption and decryption are fundamental requirements of every secure-aware application, therefore the Java platform provides strong support for encryption and decryption through its Java Cryptographic Extension (JCE) framework which implements the standard cryptographic algorithms such as AES, DES, DESede and RSA. This tutorial shows you how to basically encrypt and decrypt files using the Advanced Encryption Standard (AES) algorithm. AES is a symmetric-key algorithm that uses the same key for both encryption and decryption of data. Vb6

1. Basic Steps

Here are the general steps to encrypt/decrypt a file in Java:

Create a Key from a given byte array for a given algorithm.
Get an instance of Cipher class for a given algorithm transformation. See document of the Cipher class for more information regarding supported algorithms and transformations.
Initialize the Cipher with an appropriate mode (encrypt or decrypt) and the given Key.
Invoke doFinal(input_bytes) method of the Cipher class to perform encryption or decryption on the input_bytes, which returns an encrypted or decrypted byte array.
Read an input file to a byte array and write the encrypted/decrypted byte array to an output file accordingly.

Now, let’s see some real examples.

2. The CryptoUtils class

Here’s a utility class that provides two utility methods, one for encrypt a file and another for decrypt a file:Both the methods encrypt() and decrypt() accepts a key, an input file and an output file as parameters, and throws a CryptoException which is a custom exception written as below:This custom exception eliminates the messy throws clause, thus make the caller invoking those methods without catching a lengthy list of original exceptions.

3. The CryptoUtilsTest class

The following code is written for a test class that tests the CryptoUtils class above:This test program simply encrypts a text file, and then decrypts the encrypted file. Note that the key used for encryption and decryption here is a string “Mary has one cat”;

4. Note about key size

The AES algorithm requires that the key size must be 16 bytes (or 128 bit). So if you provide a key whose size is not equal to 16 bytes, a java.security.InvalidKeyException will be thrown. In case your key is longer, you should consider using a padding mechanism that transforms the key into a form in which its size is multiples of 16 bytes. See the Cipher class Javadoc for more details.

References:

About the Author:

Nam Ha Minh is certified Java programmer (SCJP and SCWCD). He started programming with Java in the time of Java 1.4 and has been falling in love with Java since then. Make friend with him on Facebook and watch his Java videos you YouTube.

Encrypt Decrypt Vb6 Source Code

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