scip/twenty4
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fix cipher pseudo code

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TLINDEN
2015-09-02 06:17:38 +02:00
parent 4ad452dc82
commit 41d280cc3e
1 changed files with 5 additions and 3 deletions
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README.md
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@@ -70,7 +70,7 @@ The input key will be expanded into a 32 byte array. Maximum key size is
for KROUND in 0..31 for KROUND in 0..31
for ROUND in 0..31 for ROUND in 0..31
K[ROUND] = IV xor (rotateleft-3(K[ROUND]) xor KBOX[rcon(IV)]) K[ROUND] = IV xor (rotateleft(K[ROUND], 3) xor KBOX[rcon(IV)])
IV = K[ROUND] IV = K[ROUND]
endfor endfor
endfor endfor
@@ -90,8 +90,8 @@ where:
for ROUND in 0..17 for ROUND in 0..17
OUTBYTE = OUTBYTE xor K[ROUND] OUTBYTE = OUTBYTE xor K[ROUND]
OUTBYTE = OUTBYTE xor SBOX[OUTBYTE] OUTBYTE = OUTBYTE xor SBOX[OUTBYTE]
OUTBYTE = rotateleft-ROUND%8(OUTBYTE) OUTBYTE = rotateleft(OUTBYTE, ROUND mod 8)
OUTBYTE = rotateright-4(K[ROUND]) OUTBYTE = rotateright(K[ROUND], 4)
endfor endfor
rotatekey(K, OUTBYTE) rotatekey(K, OUTBYTE)
OUTBYTE => <OUTSTREAM> OUTBYTE => <OUTSTREAM>
@@ -112,6 +112,8 @@ where:
INBYTE: one input byte INBYTE: one input byte
OUTBYTE: encrypted result for output OUTBYTE: encrypted result for output
SBOX[256]: pre computed S-Box for encryption SBOX[256]: pre computed S-Box for encryption
rotateleft(B,N): rotate byte B by N bits to the left
rotateright(B,N): rotate byte B by N bits to the right
## Analysis so far ## Analysis so far