MessageDigest.hpp

/**
 * Copyright (c) 2017, Tresorit Kft.
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 *
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 *   list of conditions and the following disclaimer.
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 * * Redistributions in binary form must reproduce the above copyright notice,
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 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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#pragma once

#include <cstddef>
#include <cstdint>
#include <openssl/ossl_typ.h>

enum class DigestAlgorithm : uint8_t
{
    SHA256,
    SHA512
};

const EVP_MD* getMessageDigest(DigestAlgorithm mdType);

class MessageDigestCtx
{
private:
    EVP_MD_CTX* ctx;

public:
    MessageDigestCtx();
    MessageDigestCtx(const MessageDigestCtx&) = delete;
    MessageDigestCtx& operator=(const MessageDigestCtx&) = delete;
    MessageDigestCtx(MessageDigestCtx&& other);
    MessageDigestCtx& operator=(MessageDigestCtx&& other);
    ~MessageDigestCtx();

    EVP_MD_CTX* get();

    void hashInit(const EVP_MD* digest);
    void hashUpdate(const uint8_t* data, size_t length);
    void hashFinalize(uint8_t* hash);

    EVP_PKEY_CTX* signInit(const EVP_MD* digest, EVP_PKEY* key);
    void signUpdate(const uint8_t* data, size_t len);
    void signFinalize(uint8_t* signature, size_t signatureLen);

    EVP_PKEY_CTX* verifyInit(const EVP_MD* digest, EVP_PKEY* key);
    void verifyUpdate(const uint8_t* data, size_t len);
    int verifyFinalize(const uint8_t* signature, size_t signatureLen);
};