ref: 8f221cfec126daa8d29bbcced20dbbe0bce0ae98
parent: 1a782fda3e0fcc3205dc4b2a9b6ef3a75f68efb7
author: ftrvxmtrx <ftrvxmtrx@gmail.com>
date: Wed Nov 16 21:02:32 EST 2016
libsec: remove unused aes_setupDec
--- a/sys/src/libsec/port/aes.c
+++ b/sys/src/libsec/port/aes.c
@@ -59,8 +59,6 @@
static int aes_setupEnc(ulong rk[/*4*(Nr + 1)*/], const uchar cipherKey[],
int keyBits);
-static int aes_setupDec(ulong rk[/*4*(Nr + 1)*/], const uchar cipherKey[],
- int keyBits);
static int aes_setup(ulong erk[/*4*(Nr + 1)*/], ulong drk[/*4*(Nr + 1)*/],
const uchar cipherKey[], int keyBits);
@@ -1047,56 +1045,6 @@
}
}
return 0;
-}
-
-/**
- * Expand the cipher key into the decryption key schedule.
- *
- * @return the number of rounds for the given cipher key size.
- */
-static int
-aes_setupDec(ulong rk[/* 4*(Nr + 1) */], const uchar cipherKey[], int keyBits)
-{- int Nr, i, j;
- ulong temp;
-
- /* expand the cipher key: */
- Nr = aes_setupEnc(rk, cipherKey, keyBits);
- /* invert the order of the round keys: */
- for (i = 0, j = 4*Nr; i < j; i += 4, j -= 4) {- temp = rk[i ]; rk[i ] = rk[j ]; rk[j ] = temp;
- temp = rk[i + 1]; rk[i + 1] = rk[j + 1]; rk[j + 1] = temp;
- temp = rk[i + 2]; rk[i + 2] = rk[j + 2]; rk[j + 2] = temp;
- temp = rk[i + 3]; rk[i + 3] = rk[j + 3]; rk[j + 3] = temp;
- }
- /*
- * apply the inverse MixColumn transform to all round keys
- * but the first and the last:
- */
- for (i = 1; i < Nr; i++) {- rk += 4;
- rk[0] =
- Td0[Te4[(rk[0] >> 24) ]] ^
- Td1[Te4[(rk[0] >> 16) & 0xff]] ^
- Td2[Te4[(rk[0] >> 8) & 0xff]] ^
- Td3[Te4[(rk[0] ) & 0xff]];
- rk[1] =
- Td0[Te4[(rk[1] >> 24) ]] ^
- Td1[Te4[(rk[1] >> 16) & 0xff]] ^
- Td2[Te4[(rk[1] >> 8) & 0xff]] ^
- Td3[Te4[(rk[1] ) & 0xff]];
- rk[2] =
- Td0[Te4[(rk[2] >> 24) ]] ^
- Td1[Te4[(rk[2] >> 16) & 0xff]] ^
- Td2[Te4[(rk[2] >> 8) & 0xff]] ^
- Td3[Te4[(rk[2] ) & 0xff]];
- rk[3] =
- Td0[Te4[(rk[3] >> 24) ]] ^
- Td1[Te4[(rk[3] >> 16) & 0xff]] ^
- Td2[Te4[(rk[3] >> 8) & 0xff]] ^
- Td3[Te4[(rk[3] ) & 0xff]];
- }
- return Nr;
}
/* using round keys in rk, perform Nr rounds of encrypting pt into ct */