nimAES

Advanced Encryption Standard

Rinjdael Algorithm written in Nim

initially this was part of nimPDF project, then I decided to release it separately

example:

var aes = initAES()
let input = "0123456789ABCDEF"
let key = "FEDCBA9876543210"
if aes.setEncodeKey(key):
  let encrypted = aes.encryptECB(input)
  if aes.setDecodeKey(key):
    let decrypted = aes.decryptECB(encrypted)
    assert decrypted == input

both setEncodeKey and setDecodeKey accept 128, 192, and 256 bits key length

supported mode:

MODE	Codec Pair	IV 16 bytes	IO	EncKey	DecKey
ECB	yes	no	1 block	yes	yes
CBC	yes	yes	n x blocks	yes	yes
CFB128	yes	yes	n x blocks	yes	no
CFB8	yes	yes	n x blocks	yes	no
CTR	no	yes	stream	yes	no
OFB	no	yes	n x blocks	yes	no

output length always same with input length

1 block equal to 16 bytes

CTR mode accept arbitrary input length

IV = Initialization Vector

Codec Pair:

• yes: have encrypt and decrypt
• no: only one function both for encrypt and decrypt