scip/twenty4
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allow 256 key max

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TLINDEN
2015-09-02 06:06:04 +02:00
parent 28bf5306c2
commit cf85600b57
2 changed files with 8 additions and 8 deletions
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10
README.md
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@@ -55,10 +55,10 @@ TWENTY4 uses two S-Box arrays, one for key expansion and one for encryption.
## Key expansion
The input key will be expanded into a 17 byte array. Maximum key size is
17 bytes (136 bit).
32 bytes (256 bit).
IV = KU[0]
for ROUND in 0..16
for ROUND in 0..31
if KU[ROUND]
K[ROUND] = IV xor KU[ROUND]
else
@@ -69,7 +69,7 @@ The input key will be expanded into a 17 byte array. Maximum key size is
endfor
for KROUND in 0..31
for ROUND in 0..17
for ROUND in 0..31
K[ROUND] = IV xor (rotateleft-3(K[ROUND]) xor KBOX[rcon(IV)])
IV = K[ROUND]
endfor
@@ -79,7 +79,7 @@ where:
KU: input key
K[17]: initial round key array
ROUND: encryption round 1-17
ROUND: encryption round 1-32
KROUND: key expansion round 1-32
KBOX[256]: pre computed S-Box for key expansion
@@ -98,7 +98,7 @@ where:
endfor
func rotatekey(K, B)
[rotate K[17] array elementy 1 to the right]
[rotate K[32] array elementy 1 to the right]
for N in 0..16:
K[N] = KBOX[K[N] xor B]
endfor