/usr/include/crypto++/trunhash.h is in libcrypto++-dev 5.6.1-9.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 | #ifndef CRYPTOPP_TRUNHASH_H
#define CRYPTOPP_TRUNHASH_H
#include "cryptlib.h"
NAMESPACE_BEGIN(CryptoPP)
class NullHash : public HashTransformation
{
public:
void Update(const byte *input, size_t length) {}
unsigned int DigestSize() const {return 0;}
void TruncatedFinal(byte *digest, size_t digestSize) {}
bool TruncatedVerify(const byte *digest, size_t digestLength) {return true;}
};
//! construct new HashModule with smaller DigestSize() from existing one
template <class T>
class TruncatedHashTemplate : public HashTransformation
{
public:
TruncatedHashTemplate(T hm, unsigned int digestSize)
: m_hm(hm), m_digestSize(digestSize) {}
TruncatedHashTemplate(const byte *key, size_t keyLength, unsigned int digestSize)
: m_hm(key, keyLength), m_digestSize(digestSize) {}
TruncatedHashTemplate(size_t digestSize)
: m_digestSize(digestSize) {}
void Restart()
{m_hm.Restart();}
void Update(const byte *input, size_t length)
{m_hm.Update(input, length);}
unsigned int DigestSize() const {return m_digestSize;}
void TruncatedFinal(byte *digest, size_t digestSize)
{m_hm.TruncatedFinal(digest, digestSize);}
bool TruncatedVerify(const byte *digest, size_t digestLength)
{return m_hm.TruncatedVerify(digest, digestLength);}
private:
T m_hm;
unsigned int m_digestSize;
};
typedef TruncatedHashTemplate<HashTransformation &> TruncatedHashModule;
NAMESPACE_END
#endif
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