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[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>
This commit is contained in:
Denys Vlasenko
Herbert Xu
parent
dedcf8b064
commit
ff85a8082f
1 changed files with 84 additions and 134 deletions
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@ -393,8 +393,92 @@ static const u32 camellia_sp4404[256] = {
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static void camellia_setup_tail(u32 *subkey, u32 *subL, u32 *subR, int max)
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{
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u32 dw, tl, tr;
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u32 kw4l, kw4r;
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int i;
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/* absorb kw2 to other subkeys */
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/* round 2 */
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subL[3] ^= subL[1]; subR[3] ^= subR[1];
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/* round 4 */
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subL[5] ^= subL[1]; subR[5] ^= subR[1];
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/* round 6 */
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subL[7] ^= subL[1]; subR[7] ^= subR[1];
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subL[1] ^= subR[1] & ~subR[9];
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dw = subL[1] & subL[9],
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subR[1] ^= ROL1(dw); /* modified for FLinv(kl2) */
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/* round 8 */
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subL[11] ^= subL[1]; subR[11] ^= subR[1];
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/* round 10 */
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subL[13] ^= subL[1]; subR[13] ^= subR[1];
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/* round 12 */
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subL[15] ^= subL[1]; subR[15] ^= subR[1];
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subL[1] ^= subR[1] & ~subR[17];
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dw = subL[1] & subL[17],
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subR[1] ^= ROL1(dw); /* modified for FLinv(kl4) */
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/* round 14 */
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subL[19] ^= subL[1]; subR[19] ^= subR[1];
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/* round 16 */
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subL[21] ^= subL[1]; subR[21] ^= subR[1];
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/* round 18 */
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subL[23] ^= subL[1]; subR[23] ^= subR[1];
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if (max == 24) {
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/* kw3 */
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subL[24] ^= subL[1]; subR[24] ^= subR[1];
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/* absorb kw4 to other subkeys */
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kw4l = subL[25]; kw4r = subR[25];
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} else {
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subL[1] ^= subR[1] & ~subR[25];
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dw = subL[1] & subL[25],
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subR[1] ^= ROL1(dw); /* modified for FLinv(kl6) */
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/* round 20 */
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subL[27] ^= subL[1]; subR[27] ^= subR[1];
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/* round 22 */
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subL[29] ^= subL[1]; subR[29] ^= subR[1];
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/* round 24 */
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subL[31] ^= subL[1]; subR[31] ^= subR[1];
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/* kw3 */
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subL[32] ^= subL[1]; subR[32] ^= subR[1];
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/* absorb kw4 to other subkeys */
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kw4l = subL[33]; kw4r = subR[33];
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/* round 23 */
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subL[30] ^= kw4l; subR[30] ^= kw4r;
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/* round 21 */
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subL[28] ^= kw4l; subR[28] ^= kw4r;
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/* round 19 */
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subL[26] ^= kw4l; subR[26] ^= kw4r;
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kw4l ^= kw4r & ~subR[24];
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dw = kw4l & subL[24],
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kw4r ^= ROL1(dw); /* modified for FL(kl5) */
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}
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/* round 17 */
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subL[22] ^= kw4l; subR[22] ^= kw4r;
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/* round 15 */
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subL[20] ^= kw4l; subR[20] ^= kw4r;
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/* round 13 */
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subL[18] ^= kw4l; subR[18] ^= kw4r;
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kw4l ^= kw4r & ~subR[16];
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dw = kw4l & subL[16],
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kw4r ^= ROL1(dw); /* modified for FL(kl3) */
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/* round 11 */
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subL[14] ^= kw4l; subR[14] ^= kw4r;
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/* round 9 */
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subL[12] ^= kw4l; subR[12] ^= kw4r;
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/* round 7 */
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subL[10] ^= kw4l; subR[10] ^= kw4r;
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kw4l ^= kw4r & ~subR[8];
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dw = kw4l & subL[8],
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kw4r ^= ROL1(dw); /* modified for FL(kl1) */
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/* round 5 */
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subL[6] ^= kw4l; subR[6] ^= kw4r;
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/* round 3 */
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subL[4] ^= kw4l; subR[4] ^= kw4r;
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/* round 1 */
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subL[2] ^= kw4l; subR[2] ^= kw4r;
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/* kw1 */
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subL[0] ^= kw4l; subR[0] ^= kw4r;
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/* key XOR is end of F-function */
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SUBKEY_L(0) = subL[0] ^ subL[2];/* kw1 */
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SUBKEY_R(0) = subR[0] ^ subR[2];
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@ -509,7 +593,6 @@ static void camellia_setup128(const unsigned char *key, u32 *subkey)
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{
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u32 kll, klr, krl, krr;
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u32 il, ir, t0, t1, w0, w1;
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u32 kw4l, kw4r, dw;
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u32 subL[26];
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u32 subR[26];
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@ -609,63 +692,6 @@ static void camellia_setup128(const unsigned char *key, u32 *subkey)
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subL[24] = kll; subR[24] = klr;
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subL[25] = krl; subR[25] = krr;
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/* absorb kw2 to other subkeys */
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/* round 2 */
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subL[3] ^= subL[1]; subR[3] ^= subR[1];
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/* round 4 */
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subL[5] ^= subL[1]; subR[5] ^= subR[1];
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/* round 6 */
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subL[7] ^= subL[1]; subR[7] ^= subR[1];
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subL[1] ^= subR[1] & ~subR[9];
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dw = subL[1] & subL[9],
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subR[1] ^= ROL1(dw); /* modified for FLinv(kl2) */
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/* round 8 */
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subL[11] ^= subL[1]; subR[11] ^= subR[1];
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/* round 10 */
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subL[13] ^= subL[1]; subR[13] ^= subR[1];
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/* round 12 */
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subL[15] ^= subL[1]; subR[15] ^= subR[1];
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subL[1] ^= subR[1] & ~subR[17];
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dw = subL[1] & subL[17],
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subR[1] ^= ROL1(dw); /* modified for FLinv(kl4) */
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/* round 14 */
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subL[19] ^= subL[1]; subR[19] ^= subR[1];
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/* round 16 */
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subL[21] ^= subL[1]; subR[21] ^= subR[1];
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/* round 18 */
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subL[23] ^= subL[1]; subR[23] ^= subR[1];
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/* kw3 */
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subL[24] ^= subL[1]; subR[24] ^= subR[1];
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/* absorb kw4 to other subkeys */
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kw4l = subL[25]; kw4r = subR[25];
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/* round 17 */
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subL[22] ^= kw4l; subR[22] ^= kw4r;
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/* round 15 */
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subL[20] ^= kw4l; subR[20] ^= kw4r;
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/* round 13 */
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subL[18] ^= kw4l; subR[18] ^= kw4r;
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kw4l ^= kw4r & ~subR[16];
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dw = kw4l & subL[16],
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kw4r ^= ROL1(dw); /* modified for FL(kl3) */
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/* round 11 */
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subL[14] ^= kw4l; subR[14] ^= kw4r;
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/* round 9 */
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subL[12] ^= kw4l; subR[12] ^= kw4r;
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/* round 7 */
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subL[10] ^= kw4l; subR[10] ^= kw4r;
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kw4l ^= kw4r & ~subR[8];
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dw = kw4l & subL[8],
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kw4r ^= ROL1(dw); /* modified for FL(kl1) */
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/* round 5 */
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subL[6] ^= kw4l; subR[6] ^= kw4r;
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/* round 3 */
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subL[4] ^= kw4l; subR[4] ^= kw4r;
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/* round 1 */
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subL[2] ^= kw4l; subR[2] ^= kw4r;
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/* kw1 */
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subL[0] ^= kw4l; subR[0] ^= kw4r;
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camellia_setup_tail(subkey, subL, subR, 24);
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}
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@ -674,7 +700,6 @@ static void camellia_setup256(const unsigned char *key, u32 *subkey)
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u32 kll, klr, krl, krr; /* left half of key */
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u32 krll, krlr, krrl, krrr; /* right half of key */
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u32 il, ir, t0, t1, w0, w1; /* temporary variables */
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u32 kw4l, kw4r, dw;
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u32 subL[34];
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u32 subR[34];
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@ -816,81 +841,6 @@ static void camellia_setup256(const unsigned char *key, u32 *subkey)
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/* kw4 */
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subL[33] = krrl; subR[33] = krrr;
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/* absorb kw2 to other subkeys */
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/* round 2 */
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subL[3] ^= subL[1]; subR[3] ^= subR[1];
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/* round 4 */
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subL[5] ^= subL[1]; subR[5] ^= subR[1];
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/* round 6 */
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subL[7] ^= subL[1]; subR[7] ^= subR[1];
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subL[1] ^= subR[1] & ~subR[9];
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dw = subL[1] & subL[9],
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subR[1] ^= ROL1(dw); /* modified for FLinv(kl2) */
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/* round 8 */
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subL[11] ^= subL[1]; subR[11] ^= subR[1];
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/* round 10 */
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subL[13] ^= subL[1]; subR[13] ^= subR[1];
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/* round 12 */
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subL[15] ^= subL[1]; subR[15] ^= subR[1];
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subL[1] ^= subR[1] & ~subR[17];
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dw = subL[1] & subL[17],
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subR[1] ^= ROL1(dw); /* modified for FLinv(kl4) */
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/* round 14 */
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subL[19] ^= subL[1]; subR[19] ^= subR[1];
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/* round 16 */
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subL[21] ^= subL[1]; subR[21] ^= subR[1];
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/* round 18 */
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subL[23] ^= subL[1]; subR[23] ^= subR[1];
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subL[1] ^= subR[1] & ~subR[25];
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dw = subL[1] & subL[25],
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subR[1] ^= ROL1(dw); /* modified for FLinv(kl6) */
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/* round 20 */
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subL[27] ^= subL[1]; subR[27] ^= subR[1];
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/* round 22 */
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subL[29] ^= subL[1]; subR[29] ^= subR[1];
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/* round 24 */
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subL[31] ^= subL[1]; subR[31] ^= subR[1];
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/* kw3 */
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subL[32] ^= subL[1]; subR[32] ^= subR[1];
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/* absorb kw4 to other subkeys */
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kw4l = subL[33]; kw4r = subR[33];
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/* round 23 */
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subL[30] ^= kw4l; subR[30] ^= kw4r;
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/* round 21 */
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subL[28] ^= kw4l; subR[28] ^= kw4r;
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/* round 19 */
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subL[26] ^= kw4l; subR[26] ^= kw4r;
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kw4l ^= kw4r & ~subR[24];
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dw = kw4l & subL[24],
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kw4r ^= ROL1(dw); /* modified for FL(kl5) */
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/* round 17 */
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subL[22] ^= kw4l; subR[22] ^= kw4r;
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/* round 15 */
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subL[20] ^= kw4l; subR[20] ^= kw4r;
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/* round 13 */
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subL[18] ^= kw4l; subR[18] ^= kw4r;
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kw4l ^= kw4r & ~subR[16];
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dw = kw4l & subL[16],
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kw4r ^= ROL1(dw); /* modified for FL(kl3) */
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/* round 11 */
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subL[14] ^= kw4l; subR[14] ^= kw4r;
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/* round 9 */
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subL[12] ^= kw4l; subR[12] ^= kw4r;
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/* round 7 */
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subL[10] ^= kw4l; subR[10] ^= kw4r;
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kw4l ^= kw4r & ~subR[8];
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dw = kw4l & subL[8],
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kw4r ^= ROL1(dw); /* modified for FL(kl1) */
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/* round 5 */
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subL[6] ^= kw4l; subR[6] ^= kw4r;
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/* round 3 */
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subL[4] ^= kw4l; subR[4] ^= kw4r;
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/* round 1 */
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subL[2] ^= kw4l; subR[2] ^= kw4r;
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/* kw1 */
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subL[0] ^= kw4l; subR[0] ^= kw4r;
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camellia_setup_tail(subkey, subL, subR, 32);
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}
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