The Java KeyGenerator class (
javax.crypto.KeyGenerator ) is used to generate symmetric encryption keys. A symmetric encryption key is a key that is used for both encryption and decryption of data, by a symmetric encryption algorithm. In this Java KeyGenerator tutorial I will show you how to generate symmetric encryption keys.
Creating a KeyGenerator Instance
Before you can use the Java
KeyGenerator class you must create a KeyGenerator instance. You create a KeyGenerator instance by calling the static method getInstance() passing as parameter the name of the encryption algorithm to create a key for. Here is an example of creating a Java KeyGenerator instance:
This example creates a
KeyGenerator instance which can generate keys for the AES encryption algorithm.
An AES-128 expects a key of 128 bit, 16 byte. To generate such a key, use OpenSSL as: openssl rand 16 myaes.key AES-256 expects a key of 256 bit, 32 byte. To generate such a key, use OpenSSL as: openssl rand 16 myaes.key AES-256 expects a key of 256 bit, 32 byte. Encryption Key Generator. The all-in-one ultimate online toolbox that generates all kind of keys! Sygic mobile maps 10 key generator. Every coder needs All Keys Generator in its favorites! It is provided for free and only supported by ads and donations. 64-bit 128-bit 256-bit 512-bit 1024-bit 2048-bit 4096-bit. How to create a secure random AES key in Java? Ask Question. @HemanthPeela It defines the length of the keys to generate. 256-bit keys are stronger than 128-bit. The short answer: you can use any password you like, 7zip does not use your password as a raw key. The long answer: The choice of AES key size is up to you, you'll need to analyze cost vs risk. 256-bit AES is generally considered safe pretty much forever against brute-force attacks (but this is not the kind of attack that will break AES). An AES-128 expects a key of 128 bit, 16 byte. To generate such a key, use OpenSSL as: openssl rand 16 myaes.key AES-256 expects a key of 256 bit, 32 byte. To generate such a key, use OpenSSL as: openssl rand 16 myaes.key AES-256 expects a key of 256 bit, 32 byte.
Initializing the KeyGenerator
After creating the
KeyGenerator instance you must initialize it. Initializing a KeyGenerator instance is done by calling its init() Bitcoin public key generator us. method. Here is an example of initializing a KeyGenerator instance:
The
KeyGenerator init() method takes two parameters: The bit size of the keys to generate, and a SecureRandom that is used during key generation.
Generate Random 256 Bit Aes Key GeneratorGenerating a Key
Once the Java
KeyGenerator instance is initialized you can use it to generate keys. Generating a key is done by calling the KeyGenerator generateKey() method. Here is an example of generating a symmetric key:
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