[CRYPTO] camellia: Move more common code into camellia_setup_tail
Analogously to camellia7 patch, move
"absorb kw2 to other subkeys" and "absorb kw4 to other subkeys"
code parts into camellia_setup_tail(). This further reduces
source and object code size at the cost of two brances
in key setup code.
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
diff --git a/crypto/camellia.c b/crypto/camellia.c
index 86af42e..493fee7 100644
--- a/crypto/camellia.c
+++ b/crypto/camellia.c
@@ -393,8 +393,92 @@
static void camellia_setup_tail(u32 *subkey, u32 *subL, u32 *subR, int max)
{
u32 dw, tl, tr;
+ u32 kw4l, kw4r;
int i;
+ /* absorb kw2 to other subkeys */
+ /* round 2 */
+ subL[3] ^= subL[1]; subR[3] ^= subR[1];
+ /* round 4 */
+ subL[5] ^= subL[1]; subR[5] ^= subR[1];
+ /* round 6 */
+ subL[7] ^= subL[1]; subR[7] ^= subR[1];
+ subL[1] ^= subR[1] & ~subR[9];
+ dw = subL[1] & subL[9],
+ subR[1] ^= ROL1(dw); /* modified for FLinv(kl2) */
+ /* round 8 */
+ subL[11] ^= subL[1]; subR[11] ^= subR[1];
+ /* round 10 */
+ subL[13] ^= subL[1]; subR[13] ^= subR[1];
+ /* round 12 */
+ subL[15] ^= subL[1]; subR[15] ^= subR[1];
+ subL[1] ^= subR[1] & ~subR[17];
+ dw = subL[1] & subL[17],
+ subR[1] ^= ROL1(dw); /* modified for FLinv(kl4) */
+ /* round 14 */
+ subL[19] ^= subL[1]; subR[19] ^= subR[1];
+ /* round 16 */
+ subL[21] ^= subL[1]; subR[21] ^= subR[1];
+ /* round 18 */
+ subL[23] ^= subL[1]; subR[23] ^= subR[1];
+ if (max == 24) {
+ /* kw3 */
+ subL[24] ^= subL[1]; subR[24] ^= subR[1];
+
+ /* absorb kw4 to other subkeys */
+ kw4l = subL[25]; kw4r = subR[25];
+ } else {
+ subL[1] ^= subR[1] & ~subR[25];
+ dw = subL[1] & subL[25],
+ subR[1] ^= ROL1(dw); /* modified for FLinv(kl6) */
+ /* round 20 */
+ subL[27] ^= subL[1]; subR[27] ^= subR[1];
+ /* round 22 */
+ subL[29] ^= subL[1]; subR[29] ^= subR[1];
+ /* round 24 */
+ subL[31] ^= subL[1]; subR[31] ^= subR[1];
+ /* kw3 */
+ subL[32] ^= subL[1]; subR[32] ^= subR[1];
+
+ /* absorb kw4 to other subkeys */
+ kw4l = subL[33]; kw4r = subR[33];
+ /* round 23 */
+ subL[30] ^= kw4l; subR[30] ^= kw4r;
+ /* round 21 */
+ subL[28] ^= kw4l; subR[28] ^= kw4r;
+ /* round 19 */
+ subL[26] ^= kw4l; subR[26] ^= kw4r;
+ kw4l ^= kw4r & ~subR[24];
+ dw = kw4l & subL[24],
+ kw4r ^= ROL1(dw); /* modified for FL(kl5) */
+ }
+ /* round 17 */
+ subL[22] ^= kw4l; subR[22] ^= kw4r;
+ /* round 15 */
+ subL[20] ^= kw4l; subR[20] ^= kw4r;
+ /* round 13 */
+ subL[18] ^= kw4l; subR[18] ^= kw4r;
+ kw4l ^= kw4r & ~subR[16];
+ dw = kw4l & subL[16],
+ kw4r ^= ROL1(dw); /* modified for FL(kl3) */
+ /* round 11 */
+ subL[14] ^= kw4l; subR[14] ^= kw4r;
+ /* round 9 */
+ subL[12] ^= kw4l; subR[12] ^= kw4r;
+ /* round 7 */
+ subL[10] ^= kw4l; subR[10] ^= kw4r;
+ kw4l ^= kw4r & ~subR[8];
+ dw = kw4l & subL[8],
+ kw4r ^= ROL1(dw); /* modified for FL(kl1) */
+ /* round 5 */
+ subL[6] ^= kw4l; subR[6] ^= kw4r;
+ /* round 3 */
+ subL[4] ^= kw4l; subR[4] ^= kw4r;
+ /* round 1 */
+ subL[2] ^= kw4l; subR[2] ^= kw4r;
+ /* kw1 */
+ subL[0] ^= kw4l; subR[0] ^= kw4r;
+
/* key XOR is end of F-function */
SUBKEY_L(0) = subL[0] ^ subL[2];/* kw1 */
SUBKEY_R(0) = subR[0] ^ subR[2];
@@ -509,7 +593,6 @@
{
u32 kll, klr, krl, krr;
u32 il, ir, t0, t1, w0, w1;
- u32 kw4l, kw4r, dw;
u32 subL[26];
u32 subR[26];
@@ -609,63 +692,6 @@
subL[24] = kll; subR[24] = klr;
subL[25] = krl; subR[25] = krr;
- /* absorb kw2 to other subkeys */
- /* round 2 */
- subL[3] ^= subL[1]; subR[3] ^= subR[1];
- /* round 4 */
- subL[5] ^= subL[1]; subR[5] ^= subR[1];
- /* round 6 */
- subL[7] ^= subL[1]; subR[7] ^= subR[1];
- subL[1] ^= subR[1] & ~subR[9];
- dw = subL[1] & subL[9],
- subR[1] ^= ROL1(dw); /* modified for FLinv(kl2) */
- /* round 8 */
- subL[11] ^= subL[1]; subR[11] ^= subR[1];
- /* round 10 */
- subL[13] ^= subL[1]; subR[13] ^= subR[1];
- /* round 12 */
- subL[15] ^= subL[1]; subR[15] ^= subR[1];
- subL[1] ^= subR[1] & ~subR[17];
- dw = subL[1] & subL[17],
- subR[1] ^= ROL1(dw); /* modified for FLinv(kl4) */
- /* round 14 */
- subL[19] ^= subL[1]; subR[19] ^= subR[1];
- /* round 16 */
- subL[21] ^= subL[1]; subR[21] ^= subR[1];
- /* round 18 */
- subL[23] ^= subL[1]; subR[23] ^= subR[1];
- /* kw3 */
- subL[24] ^= subL[1]; subR[24] ^= subR[1];
-
- /* absorb kw4 to other subkeys */
- kw4l = subL[25]; kw4r = subR[25];
- /* round 17 */
- subL[22] ^= kw4l; subR[22] ^= kw4r;
- /* round 15 */
- subL[20] ^= kw4l; subR[20] ^= kw4r;
- /* round 13 */
- subL[18] ^= kw4l; subR[18] ^= kw4r;
- kw4l ^= kw4r & ~subR[16];
- dw = kw4l & subL[16],
- kw4r ^= ROL1(dw); /* modified for FL(kl3) */
- /* round 11 */
- subL[14] ^= kw4l; subR[14] ^= kw4r;
- /* round 9 */
- subL[12] ^= kw4l; subR[12] ^= kw4r;
- /* round 7 */
- subL[10] ^= kw4l; subR[10] ^= kw4r;
- kw4l ^= kw4r & ~subR[8];
- dw = kw4l & subL[8],
- kw4r ^= ROL1(dw); /* modified for FL(kl1) */
- /* round 5 */
- subL[6] ^= kw4l; subR[6] ^= kw4r;
- /* round 3 */
- subL[4] ^= kw4l; subR[4] ^= kw4r;
- /* round 1 */
- subL[2] ^= kw4l; subR[2] ^= kw4r;
- /* kw1 */
- subL[0] ^= kw4l; subR[0] ^= kw4r;
-
camellia_setup_tail(subkey, subL, subR, 24);
}
@@ -674,7 +700,6 @@
u32 kll, klr, krl, krr; /* left half of key */
u32 krll, krlr, krrl, krrr; /* right half of key */
u32 il, ir, t0, t1, w0, w1; /* temporary variables */
- u32 kw4l, kw4r, dw;
u32 subL[34];
u32 subR[34];
@@ -816,81 +841,6 @@
/* kw4 */
subL[33] = krrl; subR[33] = krrr;
- /* absorb kw2 to other subkeys */
- /* round 2 */
- subL[3] ^= subL[1]; subR[3] ^= subR[1];
- /* round 4 */
- subL[5] ^= subL[1]; subR[5] ^= subR[1];
- /* round 6 */
- subL[7] ^= subL[1]; subR[7] ^= subR[1];
- subL[1] ^= subR[1] & ~subR[9];
- dw = subL[1] & subL[9],
- subR[1] ^= ROL1(dw); /* modified for FLinv(kl2) */
- /* round 8 */
- subL[11] ^= subL[1]; subR[11] ^= subR[1];
- /* round 10 */
- subL[13] ^= subL[1]; subR[13] ^= subR[1];
- /* round 12 */
- subL[15] ^= subL[1]; subR[15] ^= subR[1];
- subL[1] ^= subR[1] & ~subR[17];
- dw = subL[1] & subL[17],
- subR[1] ^= ROL1(dw); /* modified for FLinv(kl4) */
- /* round 14 */
- subL[19] ^= subL[1]; subR[19] ^= subR[1];
- /* round 16 */
- subL[21] ^= subL[1]; subR[21] ^= subR[1];
- /* round 18 */
- subL[23] ^= subL[1]; subR[23] ^= subR[1];
- subL[1] ^= subR[1] & ~subR[25];
- dw = subL[1] & subL[25],
- subR[1] ^= ROL1(dw); /* modified for FLinv(kl6) */
- /* round 20 */
- subL[27] ^= subL[1]; subR[27] ^= subR[1];
- /* round 22 */
- subL[29] ^= subL[1]; subR[29] ^= subR[1];
- /* round 24 */
- subL[31] ^= subL[1]; subR[31] ^= subR[1];
- /* kw3 */
- subL[32] ^= subL[1]; subR[32] ^= subR[1];
-
- /* absorb kw4 to other subkeys */
- kw4l = subL[33]; kw4r = subR[33];
- /* round 23 */
- subL[30] ^= kw4l; subR[30] ^= kw4r;
- /* round 21 */
- subL[28] ^= kw4l; subR[28] ^= kw4r;
- /* round 19 */
- subL[26] ^= kw4l; subR[26] ^= kw4r;
- kw4l ^= kw4r & ~subR[24];
- dw = kw4l & subL[24],
- kw4r ^= ROL1(dw); /* modified for FL(kl5) */
- /* round 17 */
- subL[22] ^= kw4l; subR[22] ^= kw4r;
- /* round 15 */
- subL[20] ^= kw4l; subR[20] ^= kw4r;
- /* round 13 */
- subL[18] ^= kw4l; subR[18] ^= kw4r;
- kw4l ^= kw4r & ~subR[16];
- dw = kw4l & subL[16],
- kw4r ^= ROL1(dw); /* modified for FL(kl3) */
- /* round 11 */
- subL[14] ^= kw4l; subR[14] ^= kw4r;
- /* round 9 */
- subL[12] ^= kw4l; subR[12] ^= kw4r;
- /* round 7 */
- subL[10] ^= kw4l; subR[10] ^= kw4r;
- kw4l ^= kw4r & ~subR[8];
- dw = kw4l & subL[8],
- kw4r ^= ROL1(dw); /* modified for FL(kl1) */
- /* round 5 */
- subL[6] ^= kw4l; subR[6] ^= kw4r;
- /* round 3 */
- subL[4] ^= kw4l; subR[4] ^= kw4r;
- /* round 1 */
- subL[2] ^= kw4l; subR[2] ^= kw4r;
- /* kw1 */
- subL[0] ^= kw4l; subR[0] ^= kw4r;
-
camellia_setup_tail(subkey, subL, subR, 32);
}