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// OpenVPN -- An application to securely tunnel IP networks
// over a single port, with support for SSL/TLS-based
// session authentication and key exchange,
// packet encryption, packet authentication, and
// packet compression.
//
// Copyright (C) 2012- OpenVPN Inc.
//
// SPDX-License-Identifier: MPL-2.0 OR AGPL-3.0-only WITH openvpn3-openssl-exception
//
// Wrap the mbed TLS digest API defined in <mbedtls/md.h>
// so that it can be used as part of the crypto layer of the OpenVPN core.
#ifndef OPENVPN_MBEDTLS_CRYPTO_DIGEST_H
#define OPENVPN_MBEDTLS_CRYPTO_DIGEST_H
#include <string>
#include <mbedtls/md.h>
#include <openvpn/common/size.hpp>
#include <openvpn/common/exception.hpp>
#include <openvpn/crypto/cryptoalgs.hpp>
#include <openvpn/mbedtls/mbedtls_compat.hpp>
namespace openvpn::MbedTLSCrypto {
class HMACContext;
class DigestContext
{
DigestContext(const DigestContext &) = delete;
DigestContext &operator=(const DigestContext &) = delete;
public:
friend class HMACContext;
OPENVPN_SIMPLE_EXCEPTION(mbedtls_digest_uninitialized);
OPENVPN_SIMPLE_EXCEPTION(mbedtls_digest_final_overflow);
OPENVPN_EXCEPTION(mbedtls_digest_error);
enum
{
MAX_DIGEST_SIZE = MBEDTLS_MD_MAX_SIZE
};
DigestContext()
: initialized(false)
{
}
DigestContext(const CryptoAlgs::Type alg)
: initialized(false)
{
init(alg);
}
// SSLLib::Ctx is unused in mbedtls
DigestContext(const CryptoAlgs::Type alg, SSLLib::Ctx)
: initialized(false)
{
init(alg);
}
~DigestContext()
{
erase();
}
void init(const CryptoAlgs::Type alg)
{
erase();
mbedtls_md_init(&ctx);
if (mbedtls_md_setup(&ctx, digest_type(alg), 1) < 0)
throw mbedtls_digest_error("mbedtls_md_setup");
if (mbedtls_md_starts(&ctx) < 0)
throw mbedtls_digest_error("mbedtls_md_starts");
initialized = true;
}
void update(const unsigned char *in, const size_t size)
{
check_initialized();
if (mbedtls_md_update(&ctx, in, size) < 0)
throw mbedtls_digest_error("mbedtls_md_update");
}
size_t final(unsigned char *out)
{
check_initialized();
if (mbedtls_md_finish(&ctx, out) < 0)
throw mbedtls_digest_error("mbedtls_md_finish");
return size_();
}
size_t size() const
{
check_initialized();
return size_();
}
bool is_initialized() const
{
return initialized;
}
private:
static const mbedtls_md_info_t *digest_type(const CryptoAlgs::Type alg)
{
switch (alg)
{
#if MBEDTLS_VERSION_NUMBER < 0x03000000
case CryptoAlgs::MD4:
return mbedtls_md_info_from_type(MBEDTLS_MD_MD4);
#endif
case CryptoAlgs::MD5:
return mbedtls_md_info_from_type(MBEDTLS_MD_MD5);
case CryptoAlgs::SHA1:
return mbedtls_md_info_from_type(MBEDTLS_MD_SHA1);
case CryptoAlgs::SHA224:
return mbedtls_md_info_from_type(MBEDTLS_MD_SHA224);
case CryptoAlgs::SHA256:
return mbedtls_md_info_from_type(MBEDTLS_MD_SHA256);
case CryptoAlgs::SHA384:
return mbedtls_md_info_from_type(MBEDTLS_MD_SHA384);
case CryptoAlgs::SHA512:
return mbedtls_md_info_from_type(MBEDTLS_MD_SHA512);
default:
OPENVPN_THROW(mbedtls_digest_error, CryptoAlgs::name(alg) << ": not usable");
}
}
void erase()
{
if (initialized)
{
mbedtls_md_free(&ctx);
initialized = false;
}
}
size_t size_() const
{
return mbedtls_md_get_size(mbedtls_md_info_from_ctx(&ctx));
}
void check_initialized() const
{
#ifdef OPENVPN_ENABLE_ASSERT
if (!initialized)
throw mbedtls_digest_uninitialized();
#endif
}
bool initialized;
mbedtls_md_context_t ctx;
};
} // namespace openvpn::MbedTLSCrypto
#endif
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