src/MacMessage0.cpp

/** \file MacMessage0.c
 * Contains implementation of the functions related to HCOSE_MAC0 handle
 * objects.
 */

#include <stdlib.h>
#ifndef __MBED__
#include <memory.h>
#endif
#include <stdio.h>
#include <assert.h>
#include <string.h>

#include "cose/cose.h"
#include "cose_int.h"
#include "cose/cose_configure.h"
#include "cose_crypto.h"

#if INCLUDE_MAC0

COSE *Mac0Root = nullptr;

/*! \private
 * @brief Test if a HCOSE_MAC0 handle is valid
 *
 *  Internal function to test if a MAC0 message handle is valid.
 *  This will start returning invalid results and cause the code to
 *  crash if handles are not released before the memory that underlies them
 *  is deallocated.  This is an issue of a block allocator is used since
 *  in that case it is common to allocate memory but never to de-allocate it
 *  and just do that in a single big block.
 *
 *  @param h handle to be validated
 *  @returns result of check
 */

bool IsValidMac0Handle(HCOSE_MAC0 h)
{
	COSE_Mac0Message *p = (COSE_Mac0Message *)h;
	return _COSE_IsInList(Mac0Root, (COSE *)p);
}

HCOSE_MAC0 COSE_Mac0_Init(COSE_INIT_FLAGS flags,
	CBOR_CONTEXT_COMMA cose_errback *perr)
{
	COSE_Mac0Message *pobj = nullptr;

	CHECK_CONDITION(flags == COSE_INIT_FLAGS_NONE, COSE_ERR_INVALID_PARAMETER);

	pobj =
		(COSE_Mac0Message *)COSE_CALLOC(1, sizeof(COSE_Mac0Message), context);
	CHECK_CONDITION(pobj != nullptr, COSE_ERR_OUT_OF_MEMORY);

	if (!_COSE_Init(flags, &pobj->m_message, COSE_mac0_object,
			CBOR_CONTEXT_PARAM_COMMA perr)) {
		goto errorReturn;
	}

	_COSE_InsertInList(&Mac0Root, &pobj->m_message);

	return (HCOSE_MAC0)pobj;

errorReturn:
	if (pobj != nullptr) {
		_COSE_Mac0_Release(pobj);
		COSE_FREE(pobj, context);
	}
	return nullptr;
}

HCOSE_MAC0 _COSE_Mac0_Init_From_Object(cn_cbor *cbor,
	COSE_Mac0Message *pIn,
	CBOR_CONTEXT_COMMA cose_errback *perr)
{
	COSE_Mac0Message *pobj = pIn;
	cn_cbor *pRecipients = nullptr;
	// cn_cbor * tmp;
	cose_errback error = {COSE_ERR_NONE};
	if (perr == nullptr) {
		perr = &error;
	}

	if (pobj == nullptr) {
		pobj = (COSE_Mac0Message *)COSE_CALLOC(
			1, sizeof(COSE_Mac0Message), context);
	}
	if (pobj == nullptr) {
		perr->err = COSE_ERR_OUT_OF_MEMORY;
	errorReturn:
		if (pobj != nullptr) {
			pobj->m_message.m_ownMsg = false;
			_COSE_Mac0_Release(pobj);
			if (pIn == nullptr) {
				COSE_FREE(pobj, context);
			}
		}
		return nullptr;
	}

	if (!_COSE_Init_From_Object(
			&pobj->m_message, cbor, CBOR_CONTEXT_PARAM_COMMA perr)) {
		goto errorReturn;
	}

	pRecipients = _COSE_arrayget_int(&pobj->m_message, INDEX_MAC_RECIPIENTS);
	CHECK_CONDITION(pRecipients == nullptr, COSE_ERR_INVALID_PARAMETER);

	_COSE_InsertInList(&Mac0Root, &pobj->m_message);

	return (HCOSE_MAC0)pobj;
}

bool COSE_Mac0_Free(HCOSE_MAC0 h)
{
#ifdef USE_CBOR_CONTEXT
	cn_cbor_context *context;
#endif
	COSE_Mac0Message *p = (COSE_Mac0Message *)h;

	if (!IsValidMac0Handle(h)) {
		return false;
	}

	if (p->m_message.m_refCount > 1) {
		p->m_message.m_refCount--;
		return true;
	}

	_COSE_RemoveFromList(&Mac0Root, &p->m_message);

#ifdef USE_CBOR_CONTEXT
	context = &p->m_message.m_allocContext;
#endif

	_COSE_Mac0_Release(p);

	COSE_FREE(p, context);

	return true;
}

bool _COSE_Mac0_Release(COSE_Mac0Message *p)
{
	_COSE_Release(&p->m_message);

	return true;
}

bool COSE_Mac0_SetContent(HCOSE_MAC0 cose,
	const byte *rgbContent,
	size_t cbContent,
	cose_errback *perr)
{
	COSE_Mac0Message *p = (COSE_Mac0Message *)cose;
#ifdef USE_CBOR_CONTEXT
	cn_cbor_context *context = &p->m_message.m_allocContext;
#endif
	cn_cbor *ptmp = nullptr;
	cn_cbor_errback cbor_error;

	CHECK_CONDITION(IsValidMac0Handle(cose), COSE_ERR_INVALID_PARAMETER);

	ptmp = cn_cbor_data_create(
		rgbContent, (int)cbContent, CBOR_CONTEXT_PARAM_COMMA & cbor_error);
	CHECK_CONDITION_CBOR(ptmp != nullptr, cbor_error);

	CHECK_CONDITION_CBOR(_COSE_array_replace(&p->m_message, ptmp, INDEX_BODY,
							 CBOR_CONTEXT_PARAM_COMMA & cbor_error),
		cbor_error);
	ptmp = nullptr;

	return true;

errorReturn:
	if (ptmp != nullptr) {
		CN_CBOR_FREE(ptmp, context);
	}
	return false;
}

/*!
 * @brief Set the application external data for authentication
 *
 * MAC data objects support the authentication of external application
 * supplied data.  This function is provided to supply that data to the library.
 *
 * The external data is not copied, nor will be it freed when the handle is
 * released.
 *
 * @param hcose  Handle for the COSE MAC data object
 * @param pbEternalData  point to the external data
 * @param cbExternalData size of the external data
 * @param perr  location to return errors
 * @return result of the operation.
 */

bool COSE_Mac0_SetExternal(HCOSE_MAC0 hcose,
	const byte *pbExternalData,
	size_t cbExternalData,
	cose_errback *perr)
{
	if (!IsValidMac0Handle(hcose)) {
		if (perr != nullptr) {
			perr->err = COSE_ERR_INVALID_PARAMETER;
		}
		return false;
	}

	return _COSE_SetExternal(&((COSE_Mac0Message *)hcose)->m_message,
		pbExternalData, cbExternalData, perr);
}

cn_cbor *COSE_Mac0_map_get_int(HCOSE_MAC0 h,
	int key,
	int flags,
	cose_errback *perror)
{
	if (!IsValidMac0Handle(h)) {
		if (perror != nullptr) {
			perror->err = COSE_ERR_INVALID_PARAMETER;
		}
		return nullptr;
	}

	return _COSE_map_get_int(
		&((COSE_Mac0Message *)h)->m_message, key, flags, perror);
}

bool COSE_Mac0_map_put_int(HCOSE_MAC0 h,
	int key,
	cn_cbor *value,
	int flags,
	cose_errback *perror)
{
	if (!IsValidMac0Handle(h) || (value == nullptr)) {
		if (perror != nullptr) {
			perror->err = COSE_ERR_INVALID_PARAMETER;
		}
		return false;
	}

	return _COSE_map_put(
		&((COSE_Mac0Message *)h)->m_message, key, value, flags, perror);
}

bool COSE_Mac0_encrypt(HCOSE_MAC0 h,
	const byte *pbKey,
	size_t cbKey,
	cose_errback *perr)
{
	COSE_Mac0Message *pcose = (COSE_Mac0Message *)h;

	CHECK_CONDITION(IsValidMac0Handle(h), COSE_ERR_INVALID_HANDLE);
	CHECK_CONDITION(pbKey != nullptr, COSE_ERR_INVALID_PARAMETER);

	return _COSE_Mac_compute(pcose, pbKey, cbKey, "MAC0", perr);

errorReturn:
	return false;
}

bool COSE_Mac0_validate(HCOSE_MAC0 h,
	const byte *pbKey,
	size_t cbKey,
	cose_errback *perr)
{
	COSE_Mac0Message *pcose = (COSE_Mac0Message *)h;
	CHECK_CONDITION(IsValidMac0Handle(h), COSE_ERR_INVALID_HANDLE);
	CHECK_CONDITION(pbKey != nullptr, COSE_ERR_INVALID_PARAMETER);

	return _COSE_Mac_validate(pcose, nullptr, pbKey, cbKey, "MAC0", perr);

errorReturn:
	return false;
}

#endif