r4sas/ts3init_linux_netfilter_module
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macro to inline functions

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This commit is contained in:
Niels Werensteijn 2016-10-11 08:50:58 +02:00
parent 8702640cb1
commit 03831e546d
1 changed files with 41 additions and 33 deletions
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74
src/siphash24.c
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@ -18,34 +18,42 @@
/* default: SipHash-2-4 */
#define cROUNDS 2
#define dROUNDS 4
enum
{
ts3init_cROUNDS = 2,
ts3init_dROUNDS = 4
};
#define ROTL(x, b) (u64)(((x) << (b)) | ((x) >> (64 - (b))))
inline u64 ROTL(u64 x, int b)
{
return (x << b) | (x >> (64 - b));
}
#define U8TO64_LE(p) \
(((u64)((p)[0])) | ((u64)((p)[1]) << 8) | \
((u64)((p)[2]) << 16) | ((u64)((p)[3]) << 24) | \
((u64)((p)[4]) << 32) | ((u64)((p)[5]) << 40) | \
((u64)((p)[6]) << 48) | ((u64)((p)[7]) << 56))
inline u64 U8TO64_LE(const u8* p)
{
return (((u64)(p[0])) | ((u64)(p[1]) << 8) |
((u64)(p[2]) << 16) | ((u64)(p[3]) << 24) |
((u64)(p[4]) << 32) | ((u64)(p[5]) << 40) |
((u64)(p[6]) << 48) | ((u64)(p[7]) << 56));
}
#define SIPROUND \
do { \
v0 += v1; \
v1 = ROTL(v1, 13); \
v1 ^= v0; \
v0 = ROTL(v0, 32); \
v2 += v3; \
v3 = ROTL(v3, 16); \
v3 ^= v2; \
v0 += v3; \
v3 = ROTL(v3, 21); \
v3 ^= v0; \
v2 += v1; \
v1 = ROTL(v1, 17); \
v1 ^= v2; \
v2 = ROTL(v2, 32); \
} while (0)
inline void SIPROUND(u64* v0, u64* v1, u64* v2, u64* v3)
{
*v0 += *v1;
*v1 = ROTL(*v1, 13);
*v1 ^= *v0;
*v0 = ROTL(*v0, 32);
*v2 += *v3;
*v3 = ROTL(*v3, 16);
*v3 ^= *v2;
*v0 += *v3;
*v3 = ROTL(*v3, 21);
*v3 ^= *v0;
*v2 += *v1;
*v1 = ROTL(*v1, 17);
*v1 ^= *v2;
*v2 = ROTL(*v2, 32);
}
#ifdef DEBUG
#define TRACE \
@ -116,8 +124,8 @@ void ts3init_siphash_update(struct ts3init_siphash_state* state, const u8 *in, s
v3 ^= m;
TRACE;
for (i = 0; i < cROUNDS; ++i)
SIPROUND;
for (i = 0; i < ts3init_cROUNDS; ++i)
SIPROUND(&v0, &v1, &v2, &v3);
v0 ^= m;
case 0:
@ -133,8 +141,8 @@ void ts3init_siphash_update(struct ts3init_siphash_state* state, const u8 *in, s
v3 ^= m;
TRACE;
for (i = 0; i < cROUNDS; ++i)
SIPROUND;
for (i = 0; i < ts3init_cROUNDS; ++i)
SIPROUND(&v0, &v1, &v2, &v3);
v0 ^= m;
}
@ -185,15 +193,15 @@ u64 ts3init_siphash_finalize(struct ts3init_siphash_state* state)
v3 ^= b;
TRACE;
for (i = 0; i < cROUNDS; ++i)
SIPROUND;
for (i = 0; i < ts3init_cROUNDS; ++i)
SIPROUND(&v0, &v1, &v2, &v3);
v0 ^= b;
v2 ^= 0xff;
TRACE;
for (i = 0; i < dROUNDS; ++i)
SIPROUND;
for (i = 0; i < ts3init_dROUNDS; ++i)
SIPROUND(&v0, &v1, &v2, &v3);
b = v0 ^ v1 ^ v2 ^ v3;
return cpu_to_le64(b);