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runtime: always incorporate hash seed at start of hash computation

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Otherwise we can get predictable collisions.

R=golang-dev, dave, patrick, rsc
CC=golang-dev
https://golang.org/cl/7051043
This commit is contained in:
Ian Lance Taylor 2013-01-04 07:53:42 -08:00
parent c09649890f
commit 63bee953a2
3 changed files with 13 additions and 14 deletions
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8
src/pkg/runtime/alg.c
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@ -19,13 +19,13 @@ runtime·memhash(uintptr *h, uintptr s, void *a)
uintptr hash;
b = a;
hash = M0;
hash = M0 ^ *h;
while(s > 0) {
hash = (hash ^ *b) * M1;
b++;
s--;
}
*h = (*h ^ hash) * M1;
*h = hash;
}
void
@ -355,7 +355,7 @@ void
runtime·interhash(uintptr *h, uintptr s, void *a)
{
USED(s);
*h = (*h ^ runtime·ifacehash(*(Iface*)a)) * M1;
*h = runtime·ifacehash(*(Iface*)a, *h ^ M0) * M1;
}
void
@ -389,7 +389,7 @@ void
runtime·nilinterhash(uintptr *h, uintptr s, void *a)
{
USED(s);
*h = (*h ^ runtime·efacehash(*(Eface*)a)) * M1;
*h = runtime·efacehash(*(Eface*)a, *h ^ M0) * M1;
}
void