LibcryptoMessageDigest.h

#ifndef TENDUKE_LIBCRYPTO_LIBCRYPTOMESSAGEDIGEST_H
#define TENDUKE_LIBCRYPTO_LIBCRYPTOMESSAGEDIGEST_H
 
#include "crypto/MessageDigest.h"
 
#include <memory>
#include <openssl/evp.h>
 
namespace tenduke { namespace crypto { namespace libcrypto {
 
const char * const ALGORITHM_SHA256 = "sha256";
 
 
class LibCryptoMessageDigest : public MessageDigest
{
public:
    explicit LibCryptoMessageDigest(const char * algorithmName);
    ~LibCryptoMessageDigest() override;
 
// tenduke::crypto::MessageDigest
public:
    std::size_t length() const override;
    MessageDigest * update(
            const unsigned char * message,
            std::size_t messageLength
    ) override;
    void digestTo(unsigned char * digest) override;
    std::unique_ptr<tenduke::utl::BinaryData> digest() override;
 
protected:
    LibCryptoMessageDigest(
            const char * algorithmName,
            const EVP_MD *digest
    );
 
private:
    const EVP_MD * theDigest;
    const std::unique_ptr<EVP_MD_CTX, decltype(EVP_MD_CTX_free) *> ctx;
};
 
 
}}}
 
#endif // TENDUKE_LIBCRYPTO_LIBCRYPTOMESSAGEDIGEST_H