scip/twenty4
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TLINDEN
2015-09-05 20:28:20 +02:00
parent 0f16de4127
commit 44e14d9465
1 changed files with 7 additions and 5 deletions
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twenty4.c
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@@ -176,7 +176,7 @@ void keyhash(char *pw, byte *hash) {
/* diffuse and confuse hash */
for(round=0; round<K_HASH_ROUNDS; round++) {
for(i=0; i<K_HASH_ROUNDS; i++) {
hash[i] = iv ^ (rot8left(hash[i], 3) ^ kbox[rcon(iv)]);
hash[i] = iv ^ ((rot8left(hash[i], 3) * kbox[rcon(iv)])) % 255;
iv = hash[i];
}
}
@@ -201,11 +201,13 @@ void rotate(byte array[], int size, int amt) {
}
void rotatekey(byte *key, byte feedback) {
rotate(key, S_BOX_ROUNDS, 1);
int i;
for(i=0; i<S_BOX_ROUNDS; i++) {
key[i] = kbox[key[i] ^ feedback];
}
byte f = key[0];
for (i = S_BOX_ROUNDS-1; i>1; i--)
key[i-1] = kbox[key[i] ^ feedback];
key[16] = kbox[f ^ feedback];
}
/* actual stream cipher: