From 0b1295b066b9369decb2e664e60b0129dbc30dfb Mon Sep 17 00:00:00 2001
From: Pieter Wuille <pieter.wuille@gmail.com>
Date: Fri, 6 May 2016 20:41:28 +0200
Subject: Add SipHash-2-4 primitives to hash

---
 src/hash.h | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

(limited to 'src/hash.h')

diff --git a/src/hash.h b/src/hash.h
index 97955c8d5a..600dabec56 100644
--- a/src/hash.h
+++ b/src/hash.h
@@ -171,4 +171,19 @@ unsigned int MurmurHash3(unsigned int nHashSeed, const std::vector<unsigned char
 
 void BIP32Hash(const ChainCode &chainCode, unsigned int nChild, unsigned char header, const unsigned char data[32], unsigned char output[64]);
 
+/** SipHash-2-4, using a uint64_t-based (rather than byte-based) interface */
+class CSipHasher
+{
+private:
+    uint64_t v[4];
+    int count;
+
+public:
+    CSipHasher(uint64_t k0, uint64_t k1);
+    CSipHasher& Write(uint64_t data);
+    uint64_t Finalize() const;
+};
+
+uint64_t SipHashUint256(uint64_t k0, uint64_t k1, const uint256& val);
+
 #endif // BITCOIN_HASH_H
-- 
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