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adds comments to the lioness block cipher implementation

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This commit is contained in:
Olaoluwa Osuntokun 2015-10-17 14:21:05 -07:00
parent 98b228d77e
commit cbfefdf0f4
1 changed files with 7 additions and 4 deletions
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11
lionness.go
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@ -5,9 +5,11 @@ import (
"crypto/sha256"
)
// lionEncode...
// block cipher with a block size equivalent to our message size
// http://www.cl.cam.ac.uk/~rja14/Papers/bear-lion.pdf (section 6)
// lionEncode encrypts a message of fixed size using the LIONESS block cipher.
// The LIONESS block cipher is unique due to its variable block size. Within our
// application we set the block size equivalent to our fixed message size.
// Details concerning the rationale, security model and internals of the
// LIONESS block cipher can be found here: http://www.cl.cam.ac.uk/~rja14/Papers/bear-lion.pdf (section 6)
func lionessEncode(key [securityParameter]byte, message [messageSize]byte) [messageSize]byte {
var cipherText [messageSize]byte
copy(cipherText[:], message[:])
@ -42,7 +44,8 @@ func lionessEncode(key [securityParameter]byte, message [messageSize]byte) [mess
return cipherText
}
// lionDecode...
// lionDecode performs the inverse operation of lionessEncode. Namely,
// decrypting a previously generated cipher text, returning the original plaintext.
func lionessDecode(key [securityParameter]byte, cipherText [messageSize]byte) [messageSize]byte {
var message [messageSize]byte
copy(message[:], cipherText[:])