Java AES Encryption/Decryption using a BigInteger as a key

Question

Is it possible to encrypt/decrypt a string using AES with a BigInteger (given one, not a randomly generated number) as a key in Java?

Paul · Accepted Answer · 2010-11-19 16:22:39Z

2

You don't need BigInteger for AES key creation, the key needs to be 16 bytes long for 128-bit encryption, 24 bytes long for 192-bit encryption and 32 bytes long for 256-bit encryption.

So the key would be a byte array rather than a BigInteger. BigInteger is used in RSA and other PKI's because of the huge numbers needed to create the keys but AES doesn't do that.

Hope this helps.

answered Nov 19, 2010 at 16:22

Paul

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2 Comments

adrianp Over a year ago

and BigIntegers can be byte arrays :)

user948620 Over a year ago

Thanks for this, you gave me a clue to generate a key :) +1

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