VirgilHKDF.h

#ifndef VIRGIL_CRYPTO_FOUNDATION_VIRGIL_HKDF_H
#define VIRGIL_CRYPTO_FOUNDATION_VIRGIL_HKDF_H

#include "../VirgilByteArray.h"
#include "VirgilHash.h"

namespace virgil { namespace crypto { namespace foundation {

class VirgilHKDF {
public:
    VirgilHKDF(VirgilHash::Algorithm hashAlgorithm);

    virgil::crypto::VirgilByteArray derive(
            const virgil::crypto::VirgilByteArray& in, const virgil::crypto::VirgilByteArray& salt,
            const virgil::crypto::VirgilByteArray& info, size_t outSize) const;

private:
    virgil::crypto::VirgilByteArray extract(
            const virgil::crypto::VirgilByteArray& keyMaterial, const virgil::crypto::VirgilByteArray& salt) const;

    virgil::crypto::VirgilByteArray expand(
            const virgil::crypto::VirgilByteArray& pseudoRandomKey, const virgil::crypto::VirgilByteArray& info,
            size_t outSize) const;

private:
    const VirgilHash::Algorithm hashAlgorithm_;
};

}}}

#endif //VIRGIL_CRYPTO_FOUNDATION_VIRGIL_HKDF_H