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| author | Denys Vlasenko <vda.linux@googlemail.com> | 2007-11-06 22:13:40 +0800 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2008-01-11 08:16:07 +1100 |
| commit | 1ce73e8d6d95ceb860184c34fa1a91a82e51cbb3 (patch) | |
| tree | 9c6c9b99f46b74f329e4ad850273c023b85f78c0 /crypto/camellia.c | |
| parent | 3a5e5f8108fe440657e8041afd973d2fe72180bb (diff) | |
| download | linux-1ce73e8d6d95ceb860184c34fa1a91a82e51cbb3.tar.gz linux-1ce73e8d6d95ceb860184c34fa1a91a82e51cbb3.tar.bz2 linux-1ce73e8d6d95ceb860184c34fa1a91a82e51cbb3.zip | |
[CRYPTO] camellia: Code cleanup
Optimize GETU32 to use 4-byte memcpy (modern gcc will convert
such memcpy to single move instruction on i386).
Original GETU32 did four byte fetches, and shifted/XORed those.
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>
Diffstat (limited to 'crypto/camellia.c')
| -rw-r--r-- | crypto/camellia.c | 39 |
1 files changed, 21 insertions, 18 deletions
diff --git a/crypto/camellia.c b/crypto/camellia.c index ac372e43e2a3..16529dddee72 100644 --- a/crypto/camellia.c +++ b/crypto/camellia.c @@ -330,10 +330,12 @@ static const u32 camellia_sp4404[256] = { * macros */ -# define GETU32(pt) (((u32)(pt)[0] << 24) \ - ^ ((u32)(pt)[1] << 16) \ - ^ ((u32)(pt)[2] << 8) \ - ^ ((u32)(pt)[3])) +# define GETU32(v, pt) \ + do { \ + /* latest breed of gcc is clever enough to use move */ \ + memcpy(&(v), (pt), 4); \ + (v) = be32_to_cpu(v); \ + } while(0) /* rotation right shift 1byte */ #define ROR8(x) (((x) >> 8) + ((x) << 24)) @@ -433,10 +435,11 @@ static void camellia_setup128(const unsigned char *key, u32 *subkey) /** * k == kll || klr || krl || krr (|| is concatination) */ - kll = GETU32(key ); - klr = GETU32(key + 4); - krl = GETU32(key + 8); - krr = GETU32(key + 12); + GETU32(kll, key ); + GETU32(klr, key + 4); + GETU32(krl, key + 8); + GETU32(krr, key + 12); + /** * generate KL dependent subkeys */ @@ -687,8 +690,8 @@ static void camellia_setup128(const unsigned char *key, u32 *subkey) static void camellia_setup256(const unsigned char *key, u32 *subkey) { - u32 kll,klr,krl,krr; /* left half of key */ - u32 krll,krlr,krrl,krrr; /* right half of key */ + 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, tl, tr; u32 subL[34]; @@ -698,14 +701,14 @@ static void camellia_setup256(const unsigned char *key, u32 *subkey) * key = (kll || klr || krl || krr || krll || krlr || krrl || krrr) * (|| is concatination) */ - kll = GETU32(key ); - klr = GETU32(key + 4); - krl = GETU32(key + 8); - krr = GETU32(key + 12); - krll = GETU32(key + 16); - krlr = GETU32(key + 20); - krrl = GETU32(key + 24); - krrr = GETU32(key + 28); + GETU32(kll, key ); + GETU32(klr, key + 4); + GETU32(krl, key + 8); + GETU32(krr, key + 12); + GETU32(krll, key + 16); + GETU32(krlr, key + 20); + GETU32(krrl, key + 24); + GETU32(krrr, key + 28); /* generate KL dependent subkeys */ /* kw1 */ |