xfnw/plan9fox
1
0
Fork 0
Code Issues Pull requests Projects Releases Wiki Activity

libsec: remove unused aes_setupDec

Browse source
This commit is contained in:
ftrvxmtrx 2016-11-17 02:02:32 +01:00
parent 1a782fda3e
commit 8f221cfec1
1 changed files with 0 additions and 52 deletions
Download patch file Download diff file Expand all files Collapse all files

52
sys/src/libsec/port/aes.c
View file

@ -59,8 +59,6 @@ static uchar basekey[3][16] = {
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);
@ -1049,56 +1047,6 @@ aes_setupEnc(ulong rk[/*4*(Nr + 1)*/], const uchar cipherKey[], int keyBits)
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 */
void
aes_encrypt(const ulong rk[/* 4*(Nr + 1) */], int Nr, const uchar pt[16],