- Aes Secret Key Generator Java
- Aes Encryption Key Generator Java Code
- Aes 256 Encryption Key Generator Java
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Contents
- Conclusion
1. Introduction
The Advanced Encryption Standard (AES) is a standard for encryption and decryption that has been approved by the U.S. NIST (National Institute of Standards and Technology) in 2001. It is more secure than the previous encryption standard DES(Data Encryption Standard) and 3DES(Triple-DES). You should be using AES for all symmetric encryption needs in preference to DES and 3DES (which are now deprecated).
Symmetric Encryption refers to algorithms that use the same key for encryption as well as decryption. As such, the key should be kept secret and must be exchanged between the encryptor and decryptor using a secure channel.
The core java libraries provide good support for all aspects of encryption and decryption using AES so no external libraries are required. In this article, we show you how to properly perform encryption and decryption using AES with just the core java API.
[Note: Check out how to use AES for file encryption and decryption in python.]
2. The Imports
We need the following import statements for the program.
3. Generate an Initialization Vector (IV)
When using AES with a mode known as CBC (Cipher Block Chaining), you need to generate an initialization vector (IV). In the CBC mode, each plaintext block is XORed with the previous ciphertext block before being encrypted. So you need an initialization vector for the first block. To produce different ciphertext with each run of the encryption (even with the same plaintext and key), we use a random initialization vector.
To generate the IV, we use the SecureRandomclass. The block size required depends on the AES encryption block size. For the default block size of 128 bits, we need an initialization vector of 16 bytes.
To generate private (d,n) key using openssl you can use the following command: openssl genrsa -out private.pem 1024 To generate public (e,n) key from the private key using openssl you can use the following command: openssl rsa -in private.pem -out public.pem -pubout.
From the initialization vector, we create an IvParameterSpecwhich is required when creating the Cipher.
You can save the initialization vector for transmission along with the ciphertext as follows. This file can be transmitted plainly i.e. no encryption is required.
4. Generating or Loading a Secret Key
If you do not already have a key, you should generate one as follows:
Aes Secret Key Generator Java
If you have a key (maybe one generated previously and stored securely), you can load it from a binary key file using the following code:
If you need to save a generated key for future usage (maybe for loading using the above code), you can do it as follows:
Aes Encryption Key Generator Java Code
5. Creating the Cipher
Aes 256 Encryption Key Generator Java
The Cipher object is the one that handles the actual encryption and decryption. It needs the secret key and the IvParameterSpec created above.
When encrypting, create the Cipher object as follows:
For decryption, you need to load the initialization vector and create the IvParameterSpec.
Now you can create the Cipher object:
6. Encrypting a String
Once the Cipher object is created, you can perform the encryption. The encryption process works with byte arrays.
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To encrypt a String, first convert it to a byte array by encoding it in UTF-8. Then write the data to a file as follows:
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7. Decrypting Back to a String
Read back encrypted text and convert it to a String as follows:
8. Encrypting a File
The procedure for encrypting a file is a bit more involved. Read the input data in a loop and invoke Cipher.update(). If a byte array is returned, you can write it to the output file. Finally wrap up with a Cipher.doFinal().
Invoke the encryption as follows:
9. Decrypting a File
The outfile obtained from the above procedure can be decrypted quite simply by specifying the decrypt mode as follows:
And that covers the whole story of encryption and decryption using AES.
Conclusion
The process for encrypting and decrypting using AES is a bit involved. First you generate an IV (initialization vector) and then generate (or load) a secret key. Next you create a cipher object which you can use for encryption and decryption.