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// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2013 The Bitcoin developers
// Distributed under the MIT/X11 software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#ifndef BITCOIN_HASH_H
#define BITCOIN_HASH_H
#include "sha2.h"
#include "serialize.h"
#include "uint256.h"
#include "version.h"
#include <vector>
#include <openssl/ripemd.h>
/** A hasher class for Bitcoin's 256-bit hash (double SHA-256). */
class CHash256 {
private:
CSHA256 sha;
public:
void Finalize(unsigned char *hash) {
unsigned char buf[32];
sha.Finalize(buf);
sha.Reset().Write(buf, 32).Finalize(hash);
}
CHash256& Write(const unsigned char *data, size_t len) {
sha.Write(data, len);
return *this;
}
CHash256& Reset() {
sha.Reset();
return *this;
}
};
/** A hasher class for Bitcoin's 160-bit hash (SHA-256 + RIPEMD-160). */
class CHash160 {
private:
CSHA256 sha;
public:
void Finalize(unsigned char *hash) {
unsigned char buf[32];
sha.Finalize(buf);
RIPEMD160(buf, 32, hash);
}
CHash160& Write(const unsigned char *data, size_t len) {
sha.Write(data, len);
return *this;
}
CHash160& Reset() {
sha.Reset();
return *this;
}
};
/** Compute the 256-bit hash of an object. */
template<typename T1>
inline uint256 Hash(const T1 pbegin, const T1 pend)
{
static const unsigned char pblank[1] = {};
uint256 result;
CHash256().Write(pbegin == pend ? pblank : (const unsigned char*)&pbegin[0], (pend - pbegin) * sizeof(pbegin[0]))
.Finalize((unsigned char*)&result);
return result;
}
/** Compute the 256-bit hash of the concatenation of two objects. */
template<typename T1, typename T2>
inline uint256 Hash(const T1 p1begin, const T1 p1end,
const T2 p2begin, const T2 p2end) {
static const unsigned char pblank[1] = {};
uint256 result;
CHash256().Write(p1begin == p1end ? pblank : (const unsigned char*)&p1begin[0], (p1end - p1begin) * sizeof(p1begin[0]))
.Write(p2begin == p2end ? pblank : (const unsigned char*)&p2begin[0], (p2end - p2begin) * sizeof(p2begin[0]))
.Finalize((unsigned char*)&result);
return result;
}
/** Compute the 256-bit hash of the concatenation of three objects. */
template<typename T1, typename T2, typename T3>
inline uint256 Hash(const T1 p1begin, const T1 p1end,
const T2 p2begin, const T2 p2end,
const T3 p3begin, const T3 p3end) {
static const unsigned char pblank[1] = {};
uint256 result;
CHash256().Write(p1begin == p1end ? pblank : (const unsigned char*)&p1begin[0], (p1end - p1begin) * sizeof(p1begin[0]))
.Write(p2begin == p2end ? pblank : (const unsigned char*)&p2begin[0], (p2end - p2begin) * sizeof(p2begin[0]))
.Write(p3begin == p3end ? pblank : (const unsigned char*)&p3begin[0], (p3end - p3begin) * sizeof(p3begin[0]))
.Finalize((unsigned char*)&result);
return result;
}
/** Compute the 160-bit hash an object. */
template<typename T1>
inline uint160 Hash160(const T1 pbegin, const T1 pend)
{
static unsigned char pblank[1] = {};
uint160 result;
CHash160().Write(pbegin == pend ? pblank : (const unsigned char*)&pbegin[0], (pend - pbegin) * sizeof(pbegin[0]))
.Finalize((unsigned char*)&result);
return result;
}
/** Compute the 160-bit hash of a vector. */
inline uint160 Hash160(const std::vector<unsigned char>& vch)
{
return Hash160(vch.begin(), vch.end());
}
/** A writer stream (for serialization) that computes a 256-bit hash. */
class CHashWriter
{
private:
CHash256 ctx;
public:
int nType;
int nVersion;
CHashWriter(int nTypeIn, int nVersionIn) : nType(nTypeIn), nVersion(nVersionIn) {}
CHashWriter& write(const char *pch, size_t size) {
ctx.Write((const unsigned char*)pch, size);
return (*this);
}
// invalidates the object
uint256 GetHash() {
uint256 result;
ctx.Finalize((unsigned char*)&result);
return result;
}
template<typename T>
CHashWriter& operator<<(const T& obj) {
// Serialize to this stream
::Serialize(*this, obj, nType, nVersion);
return (*this);
}
};
/** Compute the 256-bit hash of an object's serialization. */
template<typename T>
uint256 SerializeHash(const T& obj, int nType=SER_GETHASH, int nVersion=PROTOCOL_VERSION)
{
CHashWriter ss(nType, nVersion);
ss << obj;
return ss.GetHash();
}
unsigned int MurmurHash3(unsigned int nHashSeed, const std::vector<unsigned char>& vDataToHash);
#endif
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