padlkrng.h

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// via-rng.h - written and placed in public domain by Jeffrey Walton
 
 
#ifndef CRYPTOPP_PADLOCK_RNG_H
#define CRYPTOPP_PADLOCK_RNG_H
 
#include "cryptlib.h"
#include "secblock.h"
 
NAMESPACE_BEGIN(CryptoPP)
 
 
class PadlockRNG_Err : public Exception
{
public:
        PadlockRNG_Err(const std::string &operation)
                : Exception(OTHER_ERROR, "PadlockRNG: " + operation + " operation failed") {}
        PadlockRNG_Err(const std::string &component, const std::string &message)
                : Exception(OTHER_ERROR, component + ": " + message) {}
};
 
class PadlockRNG : public RandomNumberGenerator
{
public:
        CRYPTOPP_STATIC_CONSTEXPR const char* StaticAlgorithmName() { return "PadlockRNG"; }
 
        virtual ~PadlockRNG() {}
 
        PadlockRNG(word32 divisor=1);
 
        virtual void GenerateBlock(byte *output, size_t size);
 
        virtual void DiscardBytes(size_t n);
 
        virtual void IncorporateEntropy(const byte *input, size_t length)
        {
                // Override to avoid the base class' throw.
                CRYPTOPP_UNUSED(input); CRYPTOPP_UNUSED(length);
        }
 
    std::string AlgorithmProvider() const;
 
        word32 SetDivisor(word32 divisor)
        {
                word32 old = m_divisor;
                m_divisor = DivisorHelper(divisor);
                return old;
        }
 
        word32 GetDivisor() const
        {
                return m_divisor;
        }
 
        word32 GetMSR() const
        {
                return m_msr;
        }
 
protected:
        inline word32 DivisorHelper(word32 divisor)
        {
                return divisor > 3 ? 3 : divisor;
        }
 
private:
        FixedSizeAlignedSecBlock<word32, 4, true> m_buffer;
        word32 m_divisor, m_msr;
};
 
NAMESPACE_END
 
#endif  // CRYPTOPP_PADLOCK_RNG_H