diff options
author | Denys Vlasenko <vda.linux@googlemail.com> | 2007-11-06 17:15:19 +0300 |
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committer | Herbert Xu <herbert@gondor.apana.org.au> | 2008-01-11 00:16:08 +0300 |
commit | d3e7480572bf882dee5baa2891bccbfa3db0b1a1 (patch) | |
tree | 40281dcc543e1b76b835b4f63a6feadcc9720166 | |
parent | 1ce73e8d6d95ceb860184c34fa1a91a82e51cbb3 (diff) | |
download | linux-d3e7480572bf882dee5baa2891bccbfa3db0b1a1.tar.xz |
[CRYPTO] camellia: De-unrolling
Move huge unrolled pieces of code (3 screenfuls) at the end of
128/256 key setup routines into common camellia_setup_tail(),
convert it to loop there.
Loop is still unrolled six times, so performance hit is very small,
code size win is big.
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Acked-by: Noriaki TAKAMIYA <takamiya@po.ntts.co.jp>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
-rw-r--r-- | crypto/camellia.c | 107 |
1 files changed, 23 insertions, 84 deletions
diff --git a/crypto/camellia.c b/crypto/camellia.c index 16529dddee72..2e129ab1a6a2 100644 --- a/crypto/camellia.c +++ b/crypto/camellia.c @@ -424,6 +424,27 @@ static const u32 camellia_sp4404[256] = { #define SUBKEY_L(INDEX) (subkey[(INDEX)*2]) #define SUBKEY_R(INDEX) (subkey[(INDEX)*2 + 1]) +static void camellia_setup_tail(u32 *subkey, int max) +{ + u32 dw; + int i = 2; + do { + dw = SUBKEY_L(i + 0) ^ SUBKEY_R(i + 0); dw = ROL8(dw);/* round 1 */ + SUBKEY_R(i + 0) = SUBKEY_L(i + 0) ^ dw; SUBKEY_L(i + 0) = dw; + dw = SUBKEY_L(i + 1) ^ SUBKEY_R(i + 1); dw = ROL8(dw);/* round 2 */ + SUBKEY_R(i + 1) = SUBKEY_L(i + 1) ^ dw; SUBKEY_L(i + 1) = dw; + dw = SUBKEY_L(i + 2) ^ SUBKEY_R(i + 2); dw = ROL8(dw);/* round 3 */ + SUBKEY_R(i + 2) = SUBKEY_L(i + 2) ^ dw; SUBKEY_L(i + 2) = dw; + dw = SUBKEY_L(i + 3) ^ SUBKEY_R(i + 3); dw = ROL8(dw);/* round 4 */ + SUBKEY_R(i + 3) = SUBKEY_L(i + 3) ^ dw; SUBKEY_L(i + 3) = dw; + dw = SUBKEY_L(i + 4) ^ SUBKEY_R(i + 4); dw = ROL8(dw);/* round 5 */ + SUBKEY_R(i + 4) = SUBKEY_L(i + 4) ^ dw; SUBKEY_L(i + 4) = dw; + dw = SUBKEY_L(i + 5) ^ SUBKEY_R(i + 5); dw = ROL8(dw);/* round 6 */ + SUBKEY_R(i + 5) = SUBKEY_L(i + 5) ^ dw; SUBKEY_L(i + 5) = dw; + i += 8; + } while (i < max); +} + static void camellia_setup128(const unsigned char *key, u32 *subkey) { u32 kll, klr, krl, krr; @@ -650,42 +671,7 @@ static void camellia_setup128(const unsigned char *key, u32 *subkey) SUBKEY_R(24) = subR[24] ^ subR[23]; /* apply the inverse of the last half of P-function */ - dw = SUBKEY_L(2) ^ SUBKEY_R(2); dw = ROL8(dw);/* round 1 */ - SUBKEY_R(2) = SUBKEY_L(2) ^ dw; SUBKEY_L(2) = dw; - dw = SUBKEY_L(3) ^ SUBKEY_R(3); dw = ROL8(dw);/* round 2 */ - SUBKEY_R(3) = SUBKEY_L(3) ^ dw; SUBKEY_L(3) = dw; - dw = SUBKEY_L(4) ^ SUBKEY_R(4); dw = ROL8(dw);/* round 3 */ - SUBKEY_R(4) = SUBKEY_L(4) ^ dw; SUBKEY_L(4) = dw; - dw = SUBKEY_L(5) ^ SUBKEY_R(5); dw = ROL8(dw);/* round 4 */ - SUBKEY_R(5) = SUBKEY_L(5) ^ dw; SUBKEY_L(5) = dw; - dw = SUBKEY_L(6) ^ SUBKEY_R(6); dw = ROL8(dw);/* round 5 */ - SUBKEY_R(6) = SUBKEY_L(6) ^ dw; SUBKEY_L(6) = dw; - dw = SUBKEY_L(7) ^ SUBKEY_R(7); dw = ROL8(dw);/* round 6 */ - SUBKEY_R(7) = SUBKEY_L(7) ^ dw; SUBKEY_L(7) = dw; - dw = SUBKEY_L(10) ^ SUBKEY_R(10); dw = ROL8(dw);/* round 7 */ - SUBKEY_R(10) = SUBKEY_L(10) ^ dw; SUBKEY_L(10) = dw; - dw = SUBKEY_L(11) ^ SUBKEY_R(11); dw = ROL8(dw);/* round 8 */ - SUBKEY_R(11) = SUBKEY_L(11) ^ dw; SUBKEY_L(11) = dw; - dw = SUBKEY_L(12) ^ SUBKEY_R(12); dw = ROL8(dw);/* round 9 */ - SUBKEY_R(12) = SUBKEY_L(12) ^ dw; SUBKEY_L(12) = dw; - dw = SUBKEY_L(13) ^ SUBKEY_R(13); dw = ROL8(dw);/* round 10 */ - SUBKEY_R(13) = SUBKEY_L(13) ^ dw; SUBKEY_L(13) = dw; - dw = SUBKEY_L(14) ^ SUBKEY_R(14); dw = ROL8(dw);/* round 11 */ - SUBKEY_R(14) = SUBKEY_L(14) ^ dw; SUBKEY_L(14) = dw; - dw = SUBKEY_L(15) ^ SUBKEY_R(15); dw = ROL8(dw);/* round 12 */ - SUBKEY_R(15) = SUBKEY_L(15) ^ dw; SUBKEY_L(15) = dw; - dw = SUBKEY_L(18) ^ SUBKEY_R(18); dw = ROL8(dw);/* round 13 */ - SUBKEY_R(18) = SUBKEY_L(18) ^ dw; SUBKEY_L(18) = dw; - dw = SUBKEY_L(19) ^ SUBKEY_R(19); dw = ROL8(dw);/* round 14 */ - SUBKEY_R(19) = SUBKEY_L(19) ^ dw; SUBKEY_L(19) = dw; - dw = SUBKEY_L(20) ^ SUBKEY_R(20); dw = ROL8(dw);/* round 15 */ - SUBKEY_R(20) = SUBKEY_L(20) ^ dw; SUBKEY_L(20) = dw; - dw = SUBKEY_L(21) ^ SUBKEY_R(21); dw = ROL8(dw);/* round 16 */ - SUBKEY_R(21) = SUBKEY_L(21) ^ dw; SUBKEY_L(21) = dw; - dw = SUBKEY_L(22) ^ SUBKEY_R(22); dw = ROL8(dw);/* round 17 */ - SUBKEY_R(22) = SUBKEY_L(22) ^ dw; SUBKEY_L(22) = dw; - dw = SUBKEY_L(23) ^ SUBKEY_R(23); dw = ROL8(dw);/* round 18 */ - SUBKEY_R(23) = SUBKEY_L(23) ^ dw; SUBKEY_L(23) = dw; + camellia_setup_tail(subkey, 24); } static void camellia_setup256(const unsigned char *key, u32 *subkey) @@ -995,54 +981,7 @@ static void camellia_setup256(const unsigned char *key, u32 *subkey) SUBKEY_R(32) = subR[32] ^ subR[31]; /* apply the inverse of the last half of P-function */ - dw = SUBKEY_L(2) ^ SUBKEY_R(2); dw = ROL8(dw);/* round 1 */ - SUBKEY_R(2) = SUBKEY_L(2) ^ dw; SUBKEY_L(2) = dw; - dw = SUBKEY_L(3) ^ SUBKEY_R(3); dw = ROL8(dw);/* round 2 */ - SUBKEY_R(3) = SUBKEY_L(3) ^ dw; SUBKEY_L(3) = dw; - dw = SUBKEY_L(4) ^ SUBKEY_R(4); dw = ROL8(dw);/* round 3 */ - SUBKEY_R(4) = SUBKEY_L(4) ^ dw; SUBKEY_L(4) = dw; - dw = SUBKEY_L(5) ^ SUBKEY_R(5); dw = ROL8(dw);/* round 4 */ - SUBKEY_R(5) = SUBKEY_L(5) ^ dw; SUBKEY_L(5) = dw; - dw = SUBKEY_L(6) ^ SUBKEY_R(6); dw = ROL8(dw);/* round 5 */ - SUBKEY_R(6) = SUBKEY_L(6) ^ dw; SUBKEY_L(6) = dw; - dw = SUBKEY_L(7) ^ SUBKEY_R(7); dw = ROL8(dw);/* round 6 */ - SUBKEY_R(7) = SUBKEY_L(7) ^ dw; SUBKEY_L(7) = dw; - dw = SUBKEY_L(10) ^ SUBKEY_R(10); dw = ROL8(dw);/* round 7 */ - SUBKEY_R(10) = SUBKEY_L(10) ^ dw; SUBKEY_L(10) = dw; - dw = SUBKEY_L(11) ^ SUBKEY_R(11); dw = ROL8(dw);/* round 8 */ - SUBKEY_R(11) = SUBKEY_L(11) ^ dw; SUBKEY_L(11) = dw; - dw = SUBKEY_L(12) ^ SUBKEY_R(12); dw = ROL8(dw);/* round 9 */ - SUBKEY_R(12) = SUBKEY_L(12) ^ dw; SUBKEY_L(12) = dw; - dw = SUBKEY_L(13) ^ SUBKEY_R(13); dw = ROL8(dw);/* round 10 */ - SUBKEY_R(13) = SUBKEY_L(13) ^ dw; SUBKEY_L(13) = dw; - dw = SUBKEY_L(14) ^ SUBKEY_R(14); dw = ROL8(dw);/* round 11 */ - SUBKEY_R(14) = SUBKEY_L(14) ^ dw; SUBKEY_L(14) = dw; - dw = SUBKEY_L(15) ^ SUBKEY_R(15); dw = ROL8(dw);/* round 12 */ - SUBKEY_R(15) = SUBKEY_L(15) ^ dw; SUBKEY_L(15) = dw; - dw = SUBKEY_L(18) ^ SUBKEY_R(18); dw = ROL8(dw);/* round 13 */ - SUBKEY_R(18) = SUBKEY_L(18) ^ dw; SUBKEY_L(18) = dw; - dw = SUBKEY_L(19) ^ SUBKEY_R(19); dw = ROL8(dw);/* round 14 */ - SUBKEY_R(19) = SUBKEY_L(19) ^ dw; SUBKEY_L(19) = dw; - dw = SUBKEY_L(20) ^ SUBKEY_R(20); dw = ROL8(dw);/* round 15 */ - SUBKEY_R(20) = SUBKEY_L(20) ^ dw; SUBKEY_L(20) = dw; - dw = SUBKEY_L(21) ^ SUBKEY_R(21); dw = ROL8(dw);/* round 16 */ - SUBKEY_R(21) = SUBKEY_L(21) ^ dw; SUBKEY_L(21) = dw; - dw = SUBKEY_L(22) ^ SUBKEY_R(22); dw = ROL8(dw);/* round 17 */ - SUBKEY_R(22) = SUBKEY_L(22) ^ dw; SUBKEY_L(22) = dw; - dw = SUBKEY_L(23) ^ SUBKEY_R(23); dw = ROL8(dw);/* round 18 */ - SUBKEY_R(23) = SUBKEY_L(23) ^ dw; SUBKEY_L(23) = dw; - dw = SUBKEY_L(26) ^ SUBKEY_R(26); dw = ROL8(dw);/* round 19 */ - SUBKEY_R(26) = SUBKEY_L(26) ^ dw; SUBKEY_L(26) = dw; - dw = SUBKEY_L(27) ^ SUBKEY_R(27); dw = ROL8(dw);/* round 20 */ - SUBKEY_R(27) = SUBKEY_L(27) ^ dw; SUBKEY_L(27) = dw; - dw = SUBKEY_L(28) ^ SUBKEY_R(28); dw = ROL8(dw);/* round 21 */ - SUBKEY_R(28) = SUBKEY_L(28) ^ dw; SUBKEY_L(28) = dw; - dw = SUBKEY_L(29) ^ SUBKEY_R(29); dw = ROL8(dw);/* round 22 */ - SUBKEY_R(29) = SUBKEY_L(29) ^ dw; SUBKEY_L(29) = dw; - dw = SUBKEY_L(30) ^ SUBKEY_R(30); dw = ROL8(dw);/* round 23 */ - SUBKEY_R(30) = SUBKEY_L(30) ^ dw; SUBKEY_L(30) = dw; - dw = SUBKEY_L(31) ^ SUBKEY_R(31); dw = ROL8(dw);/* round 24 */ - SUBKEY_R(31) = SUBKEY_L(31) ^ dw; SUBKEY_L(31) = dw; + camellia_setup_tail(subkey, 32); } static void camellia_setup192(const unsigned char *key, u32 *subkey) |