diff options
Diffstat (limited to 'releases/2.6.32.58/crypto-sha512-use-binary-and-instead-of-modulus.patch')
| -rw-r--r-- | releases/2.6.32.58/crypto-sha512-use-binary-and-instead-of-modulus.patch | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/releases/2.6.32.58/crypto-sha512-use-binary-and-instead-of-modulus.patch b/releases/2.6.32.58/crypto-sha512-use-binary-and-instead-of-modulus.patch new file mode 100644 index 0000000..2dba02d --- /dev/null +++ b/releases/2.6.32.58/crypto-sha512-use-binary-and-instead-of-modulus.patch @@ -0,0 +1,40 @@ +From 58d7d18b5268febb8b1391c6dffc8e2aaa751fcd Mon Sep 17 00:00:00 2001 +From: Herbert Xu <herbert@gondor.apana.org.au> +Date: Thu, 26 Jan 2012 15:03:16 +1100 +Subject: crypto: sha512 - Use binary and instead of modulus + +From: Herbert Xu <herbert@gondor.apana.org.au> + +commit 58d7d18b5268febb8b1391c6dffc8e2aaa751fcd upstream. + +The previous patch used the modulus operator over a power of 2 +unnecessarily which may produce suboptimal binary code. This +patch changes changes them to binary ands instead. + +Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> +Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> + +--- + crypto/sha512_generic.c | 4 ++-- + 1 file changed, 2 insertions(+), 2 deletions(-) + +--- a/crypto/sha512_generic.c ++++ b/crypto/sha512_generic.c +@@ -78,7 +78,7 @@ static inline void LOAD_OP(int I, u64 *W + + static inline void BLEND_OP(int I, u64 *W) + { +- W[I % 16] += s1(W[(I-2) % 16]) + W[(I-7) % 16] + s0(W[(I-15) % 16]); ++ W[I & 15] += s1(W[(I-2) & 15]) + W[(I-7) & 15] + s0(W[(I-15) & 15]); + } + + static void +@@ -105,7 +105,7 @@ sha512_transform(u64 *state, const u8 *i + + #define SHA512_16_79(i, a, b, c, d, e, f, g, h) \ + BLEND_OP(i, W); \ +- t1 = h + e1(e) + Ch(e, f, g) + sha512_K[i] + W[(i)%16]; \ ++ t1 = h + e1(e) + Ch(e, f, g) + sha512_K[i] + W[(i)&15]; \ + t2 = e0(a) + Maj(a, b, c); \ + d += t1; \ + h = t1 + t2 |