One of the most important fact for secure cryptography is to use an encryption key that is generated randomly and not by taking a passwordphrase and simply convert it to a key.
The codes will generate an AES key with size of 32 byte = 256 bit that is the maximum key size available for AES encryption.
The key output format is a byte array but when sending this key to another system or persons you often need another (string based) format - so I'm providing the key also as a Base64 encoded string.
This is a serious warning regarding the security of the programs shown in these article series. Always keep in mind my disclaimer regarding my programs: All programs are for educational purposes and are not intended to use in production or any other programs where a secure solution is needed. The programs do not have proper exceptional/error handling and in some cases they use insecure key lengths or other methods that are insecure. Never ever use the programs in real life unless checked by a qualified professional cryptographer.
The following links provide the solution in code and within an online compile that runs the code.
*1) you need the external library pointycastle version 3.1.1
*2) the Go version is a combined one: generate AES key, IV and nonce in one program
This is an output (as there is a random element your output will differ):
Generate a 32 byte long AES key
generated key length: 32 base64: a9VVidAcHk6mv09zGSfH6ZiWNWSsjt/gryi6UcnMdAg=
Last update: Oct. 18th 2021
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