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authorPieter Wuille <pieter.wuille@gmail.com>2016-05-22 11:06:18 +0200
committerPieter Wuille <pieter.wuille@gmail.com>2016-06-07 16:20:40 +0200
commit9bf156bb9ee4915fa7e8f84589d65f6598563c97 (patch)
treec9be046c2bcc72f0bb80d97e09543e633e68da04 /src/hash.cpp
parent053930ffc41ba33fe7ce26bde7097951fe0b8462 (diff)
Support SipHash with arbitrary byte writes
Diffstat (limited to 'src/hash.cpp')
-rw-r--r--src/hash.cpp39
1 files changed, 36 insertions, 3 deletions
diff --git a/src/hash.cpp b/src/hash.cpp
index a518314a53..20a83342db 100644
--- a/src/hash.cpp
+++ b/src/hash.cpp
@@ -100,12 +100,15 @@ CSipHasher::CSipHasher(uint64_t k0, uint64_t k1)
v[2] = 0x6c7967656e657261ULL ^ k0;
v[3] = 0x7465646279746573ULL ^ k1;
count = 0;
+ tmp = 0;
}
CSipHasher& CSipHasher::Write(uint64_t data)
{
uint64_t v0 = v[0], v1 = v[1], v2 = v[2], v3 = v[3];
+ assert(count % 8 == 0);
+
v3 ^= data;
SIPROUND;
SIPROUND;
@@ -116,7 +119,35 @@ CSipHasher& CSipHasher::Write(uint64_t data)
v[2] = v2;
v[3] = v3;
- count++;
+ count += 8;
+ return *this;
+}
+
+CSipHasher& CSipHasher::Write(const unsigned char* data, size_t size)
+{
+ uint64_t v0 = v[0], v1 = v[1], v2 = v[2], v3 = v[3];
+ uint64_t t = tmp;
+ int c = count;
+
+ while (size--) {
+ t |= ((uint64_t)(*(data++))) << (8 * (c % 8));
+ c++;
+ if ((c & 7) == 0) {
+ v3 ^= t;
+ SIPROUND;
+ SIPROUND;
+ v0 ^= t;
+ t = 0;
+ }
+ }
+
+ v[0] = v0;
+ v[1] = v1;
+ v[2] = v2;
+ v[3] = v3;
+ count = c;
+ tmp = t;
+
return *this;
}
@@ -124,10 +155,12 @@ uint64_t CSipHasher::Finalize() const
{
uint64_t v0 = v[0], v1 = v[1], v2 = v[2], v3 = v[3];
- v3 ^= ((uint64_t)count) << 59;
+ uint64_t t = tmp | (((uint64_t)count) << 56);
+
+ v3 ^= t;
SIPROUND;
SIPROUND;
- v0 ^= ((uint64_t)count) << 59;
+ v0 ^= t;
v2 ^= 0xFF;
SIPROUND;
SIPROUND;