src/Sign1.c - third_party/github/cose-wg/COSE-C - Git at Google

 /** \file Sign.c
 * Contains implementation of the functions related to HCOSE_SIGN handle objects.
 */

 #include <stdlib.h>

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

 #if INCLUDE_SIGN1

 bool _COSE_Signer0_sign(COSE_Sign1Message * pSigner, const cn_cbor * pKey, cose_errback * perr);
 bool _COSE_Signer0_validate(COSE_Sign1Message * pSign, const cn_cbor * pKey, cose_errback * perr);
 void _COSE_Sign1_Release(COSE_Sign1Message * p);

 COSE * Sign1Root = NULL;

 /*! \private
 * @brief Test if a HCOSE_SIGN1 handle is valid
 *
 *  Internal function to test if a sign1 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 IsValidSign1Handle(HCOSE_SIGN1 h)
 {
 	COSE_Sign1Message * p = (COSE_Sign1Message *)h;

 	if (p == NULL) return false;
 	return _COSE_IsInList(Sign1Root, (COSE *) p);
 }


 HCOSE_SIGN1 COSE_Sign1_Init(COSE_INIT_FLAGS flags, CBOR_CONTEXT_COMMA cose_errback * perr)
 {
 	CHECK_CONDITION(flags == COSE_INIT_FLAGS_NONE, COSE_ERR_INVALID_PARAMETER);
 	COSE_Sign1Message * pobj = (COSE_Sign1Message *)COSE_CALLOC(1, sizeof(COSE_Sign1Message), context);
 	if (pobj == NULL) {
 		if (perr != NULL) perr->err = COSE_ERR_OUT_OF_MEMORY;
 		return NULL;
 	}

 	if (!_COSE_Init(flags,&pobj->m_message, COSE_sign_object, CBOR_CONTEXT_PARAM_COMMA perr)) {
 		_COSE_Sign1_Release(pobj);
 		COSE_FREE(pobj, context);
 		return NULL;
 	}

 	_COSE_InsertInList(&Sign1Root, &pobj->m_message);

 	return (HCOSE_SIGN1)pobj;

 errorReturn:
 	return NULL;
 }

 HCOSE_SIGN1 _COSE_Sign1_Init_From_Object(cn_cbor * cbor, COSE_Sign1Message * pIn, CBOR_CONTEXT_COMMA cose_errback * perr)
 {
 	COSE_Sign1Message * pobj = pIn;
 	cose_errback error = { 0 };

 	if (perr == NULL) perr = &error;

 	if (pobj == NULL) pobj = (COSE_Sign1Message *)COSE_CALLOC(1, sizeof(COSE_Sign1Message), context);
 	CHECK_CONDITION(pobj != NULL, COSE_ERR_OUT_OF_MEMORY);

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

 	if (pIn == NULL) _COSE_InsertInList(&Sign1Root, &pobj->m_message);

 	return(HCOSE_SIGN1)pobj;

 errorReturn:
 	if (pobj != NULL) {
 		_COSE_Sign1_Release(pobj);
 		if (pIn == NULL) COSE_FREE(pobj, context);
 	}
 	return NULL;
 }

 bool COSE_Sign1_Free(HCOSE_SIGN1 h)
 {
 #ifdef USE_CBOR_CONTEXT
 	cn_cbor_context context;
 #endif
 	COSE_Sign1Message * pMessage = (COSE_Sign1Message *)h;

 	if (!IsValidSign1Handle(h)) return false;

 	//  Check reference counting
 	if (pMessage->m_message.m_refCount > 1) {
 		pMessage->m_message.m_refCount--;
 		return true;
 	}

 	_COSE_RemoveFromList(&Sign1Root, &pMessage->m_message);

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

 	_COSE_Sign1_Release(pMessage);

 	COSE_FREE(pMessage, &context);

 	return true;
 }

 void _COSE_Sign1_Release(COSE_Sign1Message * p)
 {
 	_COSE_Release(&p->m_message);
 }

 bool COSE_Sign1_SetContent(HCOSE_SIGN1 h, const byte * rgb, size_t cb, cose_errback * perr)
 {
 #ifdef USE_CBOR_CONTEXT
 	cn_cbor_context * context = NULL;
 #endif
 	cn_cbor * p = NULL;
 	COSE_Sign1Message * pMessage = (COSE_Sign1Message *)h;
 	bool fRet = false;

 	CHECK_CONDITION(IsValidSign1Handle(h), COSE_ERR_INVALID_HANDLE);
 	CHECK_CONDITION(rgb != NULL, COSE_ERR_INVALID_PARAMETER);

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

 	p = cn_cbor_data_create(rgb, (int) cb, CBOR_CONTEXT_PARAM_COMMA NULL);
 	CHECK_CONDITION(p != NULL, COSE_ERR_OUT_OF_MEMORY);

 	CHECK_CONDITION(_COSE_array_replace(&pMessage->m_message, p, INDEX_BODY, CBOR_CONTEXT_PARAM_COMMA NULL), COSE_ERR_OUT_OF_MEMORY);
 	p = NULL;

 	fRet = true;

 errorReturn:
 	if (p != NULL) CN_CBOR_FREE(p, context);
 	return fRet;
 }

 /*!
 * @brief Set the application external data for authentication
 *
 * Enveloped 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 Enveloped 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_Sign1_SetExternal(HCOSE_SIGN1 hcose, const byte * pbExternalData, size_t cbExternalData, cose_errback * perr)
 {
 	if (!IsValidSign1Handle(hcose)) {
 		if (perr != NULL) perr->err = COSE_ERR_INVALID_HANDLE;
 		return false;
 	}

 	return _COSE_SetExternal(&((COSE_Sign1Message *)hcose)->m_message, pbExternalData, cbExternalData, perr);
 }

 bool COSE_Sign1_Sign(HCOSE_SIGN1 h, const cn_cbor * pKey, cose_errback * perr)
 {
 #ifdef USE_CBOR_CONTEXT
 	// cn_cbor_context * context = NULL;
 #endif
 	COSE_Sign1Message * pMessage = (COSE_Sign1Message *)h;
 	const cn_cbor * pcborProtected;

 	if (!IsValidSign1Handle(h)) {
 		CHECK_CONDITION(false, COSE_ERR_INVALID_HANDLE);
 	errorReturn:
 		return false;
 	}
 #ifdef USE_CBOR_CONTEXT
 	//	context = &pMessage->m_message.m_allocContext;
 #endif

 	pcborProtected = _COSE_encode_protected(&pMessage->m_message, perr);
 	if (pcborProtected == NULL) goto errorReturn;

 	if (!_COSE_Signer0_sign(pMessage, pKey, perr)) goto errorReturn;

 	return true;
 }

 bool COSE_Sign1_validate(HCOSE_SIGN1 hSign, const cn_cbor * pKey, cose_errback * perr)
 {
 	bool f;
 	COSE_Sign1Message * pSign;
 	const cn_cbor * cnContent;
 	const cn_cbor * cnProtected;

 	CHECK_CONDITION(IsValidSign1Handle(hSign), COSE_ERR_INVALID_HANDLE);

 	pSign = (COSE_Sign1Message *)hSign;

 	cnContent = _COSE_arrayget_int(&pSign->m_message, INDEX_BODY);
 	CHECK_CONDITION(cnContent != NULL && cnContent->type == CN_CBOR_BYTES, COSE_ERR_INVALID_PARAMETER);

 	cnProtected = _COSE_arrayget_int(&pSign->m_message, INDEX_PROTECTED);
 	CHECK_CONDITION(cnProtected != NULL && cnProtected->type == CN_CBOR_BYTES, COSE_ERR_INVALID_PARAMETER);

 	f = _COSE_Signer0_validate(pSign, pKey,  perr);

 	return f;

 errorReturn:
 	return false;
 }


 cn_cbor * COSE_Sign1_map_get_int(HCOSE_SIGN1 h, int key, int flags, cose_errback * perror)
 {
 	if (!IsValidSign1Handle(h)) {
 		if (perror != NULL) perror->err = COSE_ERR_INVALID_HANDLE;
 		return NULL;
 	}

 	return _COSE_map_get_int(&((COSE_Sign1Message *)h)->m_message, key, flags, perror);
 }

 bool COSE_Sign1_map_put_int(HCOSE_SIGN1 h, int key, cn_cbor * value, int flags, cose_errback * perr)
 {
 	CHECK_CONDITION(IsValidSign1Handle(h), COSE_ERR_INVALID_HANDLE);
 	CHECK_CONDITION(value != NULL, COSE_ERR_INVALID_PARAMETER);

 	return _COSE_map_put(&((COSE_Sign1Message *)h)->m_message, key, value, flags, perr);

 errorReturn:
 	return false;
 }


 static bool CreateSign1AAD(COSE_Sign1Message * pMessage, byte ** ppbToSign, size_t * pcbToSign, char * szContext, cose_errback * perr)
 {
 	cn_cbor * pArray = NULL;
 #ifdef USE_CBOR_CONTEXT
 	cn_cbor_context * context = &pMessage->m_message.m_allocContext;
 #endif
 	cn_cbor_errback cbor_error;
 	cn_cbor * cn = NULL;
 	cn_cbor * cn2;
 	size_t cbToSign;
 	byte * pbToSign = NULL;

 	pArray = cn_cbor_array_create(CBOR_CONTEXT_PARAM_COMMA &cbor_error);
 	CHECK_CONDITION_CBOR(pArray != NULL, cbor_error);

 	cn = cn_cbor_string_create(szContext, CBOR_CONTEXT_PARAM_COMMA &cbor_error);
 	CHECK_CONDITION_CBOR(cn != NULL, cbor_error);
 	CHECK_CONDITION_CBOR(cn_cbor_array_append(pArray, cn, &cbor_error), cbor_error);
 	cn = NULL;

 	cn2 = _COSE_arrayget_int(&pMessage->m_message, INDEX_PROTECTED);
 	CHECK_CONDITION(cn2 != NULL, COSE_ERR_INVALID_PARAMETER);

 	if ((cn2->length == 1) && (cn2->v.bytes[0] == 0xa0)) cn = cn_cbor_data_create(NULL, 0, CBOR_CONTEXT_PARAM_COMMA &cbor_error);
 	else cn = cn_cbor_data_create(cn2->v.bytes, (int)cn2->length, CBOR_CONTEXT_PARAM_COMMA &cbor_error);
 	CHECK_CONDITION_CBOR(cn != NULL, cbor_error);
 	CHECK_CONDITION_CBOR(cn_cbor_array_append(pArray, cn, &cbor_error), cbor_error);
 	cn = NULL;

 	cn = cn_cbor_data_create(pMessage->m_message.m_pbExternal, (int) pMessage->m_message.m_cbExternal, CBOR_CONTEXT_PARAM_COMMA &cbor_error);
 	CHECK_CONDITION_CBOR(cn != NULL, cbor_error);
 	CHECK_CONDITION_CBOR(cn_cbor_array_append(pArray, cn, &cbor_error), cbor_error);
 	cn = NULL;

 	cn2 = _COSE_arrayget_int(&pMessage->m_message, INDEX_BODY);
 	cn = cn_cbor_data_create(cn2->v.bytes, (int)cn2->length, CBOR_CONTEXT_PARAM_COMMA &cbor_error);
 	CHECK_CONDITION_CBOR(cn != NULL, cbor_error);
 	CHECK_CONDITION_CBOR(cn_cbor_array_append(pArray, cn, &cbor_error), cbor_error);
 	cn = NULL;


 	cbToSign = cn_cbor_encode_size(pArray);
 	CHECK_CONDITION(cbToSign > 0, COSE_ERR_CBOR);
 	pbToSign = (byte *)COSE_CALLOC(cbToSign, 1, context);
 	CHECK_CONDITION(pbToSign != NULL, COSE_ERR_OUT_OF_MEMORY);
 	CHECK_CONDITION(cn_cbor_encoder_write(pbToSign, 0, cbToSign, pArray) == cbToSign, COSE_ERR_CBOR);

 	*ppbToSign = pbToSign;
 	*pcbToSign = cbToSign;
 	pbToSign = NULL;

 	if (cn != NULL) CN_CBOR_FREE(cn, context);
 	if (pArray != NULL) COSE_FREE(pArray, context);
 	return true;

 errorReturn:
 	if (pbToSign != NULL) COSE_FREE(pbToSign, context);
 	if (cn != NULL) CN_CBOR_FREE(cn, context);
 	if (pArray != NULL) COSE_FREE(pArray, context);
 	return false;
 }

 bool _COSE_Signer0_sign(COSE_Sign1Message * pSigner, const cn_cbor * pKey, cose_errback * perr)
 {
 #ifdef USE_CBOR_CONTEXT
 	cn_cbor_context * context = &pSigner->m_message.m_allocContext;
 #endif
 	cn_cbor * pcborBody2 = NULL;
 	cn_cbor * pcborProtected2 = NULL;
 	cn_cbor * pArray = NULL;
 	cn_cbor * cn = NULL;
 	size_t cbToSign;
 	byte * pbToSign = NULL;
 	bool f;
 	int alg;

 	pArray = cn_cbor_array_create(CBOR_CONTEXT_PARAM_COMMA NULL);
 	if (pArray == NULL) {
 		if (perr != NULL) perr->err = COSE_ERR_OUT_OF_MEMORY;
 	errorReturn:
 		if (pcborBody2 != NULL) CN_CBOR_FREE(pcborBody2, context);
 		if (pcborProtected2 != NULL) CN_CBOR_FREE(pcborProtected2, context);
 		if (pArray != NULL) COSE_FREE(pArray, context);
 		if (pbToSign != NULL) COSE_FREE(pbToSign, context);
 		return false;
 	}

 	cn = _COSE_map_get_int(&pSigner->m_message, COSE_Header_Algorithm, COSE_BOTH, perr);
 	if (cn == NULL) goto errorReturn;

 	if (cn->type == CN_CBOR_TEXT) {
 		FAIL_CONDITION(COSE_ERR_UNKNOWN_ALGORITHM);
 	}
 	else {
 		CHECK_CONDITION((cn->type == CN_CBOR_UINT || cn->type == CN_CBOR_INT), COSE_ERR_INVALID_PARAMETER);

 		alg = (int)cn->v.uint;
 	}


 	if (!CreateSign1AAD(pSigner, &pbToSign, &cbToSign, "Signature1", perr)) goto errorReturn;

 	switch (alg) {
 #ifdef USE_ECDSA_SHA_256
 	case COSE_Algorithm_ECDSA_SHA_256:
 		f = ECDSA_Sign(&pSigner->m_message, INDEX_SIGNATURE+1, pKey, 256, pbToSign, cbToSign, perr);
 		break;
 #endif

 #ifdef USE_ECDSA_SHA_384
 	case COSE_Algorithm_ECDSA_SHA_384:
 		f = ECDSA_Sign(&pSigner->m_message, INDEX_SIGNATURE+1, pKey, 384, pbToSign, cbToSign, perr);
 		break;
 #endif

 #ifdef USE_ECDSA_SHA_512
 	case COSE_Algorithm_ECDSA_SHA_512:
 		f = ECDSA_Sign(&pSigner->m_message, INDEX_SIGNATURE+1, pKey, 512, pbToSign, cbToSign, perr);
 		break;
 #endif
 	default:
 		FAIL_CONDITION(COSE_ERR_UNKNOWN_ALGORITHM);
 	}

 	COSE_FREE(pbToSign, context);
 	CN_CBOR_FREE(pArray, context);

 	return f;
 }

 bool _COSE_Signer0_validate(COSE_Sign1Message * pSign, const cn_cbor * pKey, cose_errback * perr)
 {
 	byte * pbToSign = NULL;
 	int alg;
 	const cn_cbor * cn = NULL;
 #ifdef USE_CBOR_CONTEXT
 	cn_cbor_context * context = NULL;
 #endif
 	size_t cbToSign;
 	bool fRet = false;

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

 	cn = _COSE_map_get_int(&pSign->m_message, COSE_Header_Algorithm, COSE_BOTH, perr);
 	if (cn == NULL) goto errorReturn;

 	if (cn->type == CN_CBOR_TEXT) {
 		FAIL_CONDITION(COSE_ERR_UNKNOWN_ALGORITHM);
 	}
 	else {
 		CHECK_CONDITION((cn->type == CN_CBOR_UINT || cn->type == CN_CBOR_INT), COSE_ERR_INVALID_PARAMETER);

 		alg = (int)cn->v.uint;
 	}

 	//  Build protected headers

 	if (!CreateSign1AAD(pSign, &pbToSign, &cbToSign, "Signature1", perr)) goto errorReturn;

 	switch (alg) {
 #ifdef USE_ECDSA_SHA_256
 	case COSE_Algorithm_ECDSA_SHA_256:
 		if (!ECDSA_Verify(&pSign->m_message, INDEX_SIGNATURE+1, pKey, 256, pbToSign, cbToSign, perr)) goto errorReturn;
 		break;
 #endif

 #ifdef USE_ECDSA_SHA_384
 	case COSE_Algorithm_ECDSA_SHA_384:
 		if (!ECDSA_Verify(&pSign->m_message, INDEX_SIGNATURE+1, pKey, 384, pbToSign, cbToSign, perr)) goto errorReturn;
 		break;
 #endif

 #ifdef USE_ECDSA_SHA_512
 	case COSE_Algorithm_ECDSA_SHA_512:
 		if (!ECDSA_Verify(&pSign->m_message, INDEX_SIGNATURE+1, pKey, 512, pbToSign, cbToSign, perr)) goto errorReturn;
 		break;
 #endif

 	default:
 		FAIL_CONDITION(COSE_ERR_UNKNOWN_ALGORITHM);
 		break;
 	}

 	fRet = true;

 errorReturn:
 	if (pbToSign != NULL) COSE_FREE(pbToSign, context);

 	return fRet;
 }

 #endif
	/** \file Sign.c
	* Contains implementation of the functions related to HCOSE_SIGN handle objects.
	*/

	#include <stdlib.h>

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

	#if INCLUDE_SIGN1

	bool _COSE_Signer0_sign(COSE_Sign1Message * pSigner, const cn_cbor * pKey, cose_errback * perr);
	bool _COSE_Signer0_validate(COSE_Sign1Message * pSign, const cn_cbor * pKey, cose_errback * perr);
	void _COSE_Sign1_Release(COSE_Sign1Message * p);

	COSE * Sign1Root = NULL;

	/*! \private
	* @brief Test if a HCOSE_SIGN1 handle is valid
	*
	* Internal function to test if a sign1 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 IsValidSign1Handle(HCOSE_SIGN1 h)
	{
	COSE_Sign1Message * p = (COSE_Sign1Message *)h;

	if (p == NULL) return false;
	return _COSE_IsInList(Sign1Root, (COSE *) p);
	}


	HCOSE_SIGN1 COSE_Sign1_Init(COSE_INIT_FLAGS flags, CBOR_CONTEXT_COMMA cose_errback * perr)
	{
	CHECK_CONDITION(flags == COSE_INIT_FLAGS_NONE, COSE_ERR_INVALID_PARAMETER);
	COSE_Sign1Message * pobj = (COSE_Sign1Message *)COSE_CALLOC(1, sizeof(COSE_Sign1Message), context);
	if (pobj == NULL) {
	if (perr != NULL) perr->err = COSE_ERR_OUT_OF_MEMORY;
	return NULL;
	}

	if (!_COSE_Init(flags,&pobj->m_message, COSE_sign_object, CBOR_CONTEXT_PARAM_COMMA perr)) {
	_COSE_Sign1_Release(pobj);
	COSE_FREE(pobj, context);
	return NULL;
	}

	_COSE_InsertInList(&Sign1Root, &pobj->m_message);

	return (HCOSE_SIGN1)pobj;

	errorReturn:
	return NULL;
	}

	HCOSE_SIGN1 _COSE_Sign1_Init_From_Object(cn_cbor * cbor, COSE_Sign1Message * pIn, CBOR_CONTEXT_COMMA cose_errback * perr)
	{
	COSE_Sign1Message * pobj = pIn;
	cose_errback error = { 0 };

	if (perr == NULL) perr = &error;

	if (pobj == NULL) pobj = (COSE_Sign1Message *)COSE_CALLOC(1, sizeof(COSE_Sign1Message), context);
	CHECK_CONDITION(pobj != NULL, COSE_ERR_OUT_OF_MEMORY);

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

	if (pIn == NULL) _COSE_InsertInList(&Sign1Root, &pobj->m_message);

	return(HCOSE_SIGN1)pobj;

	errorReturn:
	if (pobj != NULL) {
	_COSE_Sign1_Release(pobj);
	if (pIn == NULL) COSE_FREE(pobj, context);
	}
	return NULL;
	}

	bool COSE_Sign1_Free(HCOSE_SIGN1 h)
	{
	#ifdef USE_CBOR_CONTEXT
	cn_cbor_context context;
	#endif
	COSE_Sign1Message * pMessage = (COSE_Sign1Message *)h;

	if (!IsValidSign1Handle(h)) return false;

	// Check reference counting
	if (pMessage->m_message.m_refCount > 1) {
	pMessage->m_message.m_refCount--;
	return true;
	}

	_COSE_RemoveFromList(&Sign1Root, &pMessage->m_message);

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

	_COSE_Sign1_Release(pMessage);

	COSE_FREE(pMessage, &context);

	return true;
	}

	void _COSE_Sign1_Release(COSE_Sign1Message * p)
	{
	_COSE_Release(&p->m_message);
	}

	bool COSE_Sign1_SetContent(HCOSE_SIGN1 h, const byte * rgb, size_t cb, cose_errback * perr)
	{
	#ifdef USE_CBOR_CONTEXT
	cn_cbor_context * context = NULL;
	#endif
	cn_cbor * p = NULL;
	COSE_Sign1Message * pMessage = (COSE_Sign1Message *)h;
	bool fRet = false;

	CHECK_CONDITION(IsValidSign1Handle(h), COSE_ERR_INVALID_HANDLE);
	CHECK_CONDITION(rgb != NULL, COSE_ERR_INVALID_PARAMETER);

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

	p = cn_cbor_data_create(rgb, (int) cb, CBOR_CONTEXT_PARAM_COMMA NULL);
	CHECK_CONDITION(p != NULL, COSE_ERR_OUT_OF_MEMORY);

	CHECK_CONDITION(_COSE_array_replace(&pMessage->m_message, p, INDEX_BODY, CBOR_CONTEXT_PARAM_COMMA NULL), COSE_ERR_OUT_OF_MEMORY);
	p = NULL;

	fRet = true;

	errorReturn:
	if (p != NULL) CN_CBOR_FREE(p, context);
	return fRet;
	}

	/*!
	* @brief Set the application external data for authentication
	*
	* Enveloped 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 Enveloped 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_Sign1_SetExternal(HCOSE_SIGN1 hcose, const byte * pbExternalData, size_t cbExternalData, cose_errback * perr)
	{
	if (!IsValidSign1Handle(hcose)) {
	if (perr != NULL) perr->err = COSE_ERR_INVALID_HANDLE;
	return false;
	}

	return _COSE_SetExternal(&((COSE_Sign1Message *)hcose)->m_message, pbExternalData, cbExternalData, perr);
	}

	bool COSE_Sign1_Sign(HCOSE_SIGN1 h, const cn_cbor * pKey, cose_errback * perr)
	{
	#ifdef USE_CBOR_CONTEXT
	// cn_cbor_context * context = NULL;
	#endif
	COSE_Sign1Message * pMessage = (COSE_Sign1Message *)h;
	const cn_cbor * pcborProtected;

	if (!IsValidSign1Handle(h)) {
	CHECK_CONDITION(false, COSE_ERR_INVALID_HANDLE);
	errorReturn:
	return false;
	}
	#ifdef USE_CBOR_CONTEXT
	// context = &pMessage->m_message.m_allocContext;
	#endif

	pcborProtected = _COSE_encode_protected(&pMessage->m_message, perr);
	if (pcborProtected == NULL) goto errorReturn;

	if (!_COSE_Signer0_sign(pMessage, pKey, perr)) goto errorReturn;

	return true;
	}

	bool COSE_Sign1_validate(HCOSE_SIGN1 hSign, const cn_cbor * pKey, cose_errback * perr)
	{
	bool f;
	COSE_Sign1Message * pSign;
	const cn_cbor * cnContent;
	const cn_cbor * cnProtected;

	CHECK_CONDITION(IsValidSign1Handle(hSign), COSE_ERR_INVALID_HANDLE);

	pSign = (COSE_Sign1Message *)hSign;

	cnContent = _COSE_arrayget_int(&pSign->m_message, INDEX_BODY);
	CHECK_CONDITION(cnContent != NULL && cnContent->type == CN_CBOR_BYTES, COSE_ERR_INVALID_PARAMETER);

	cnProtected = _COSE_arrayget_int(&pSign->m_message, INDEX_PROTECTED);
	CHECK_CONDITION(cnProtected != NULL && cnProtected->type == CN_CBOR_BYTES, COSE_ERR_INVALID_PARAMETER);

	f = _COSE_Signer0_validate(pSign, pKey, perr);

	return f;

	errorReturn:
	return false;
	}


	cn_cbor * COSE_Sign1_map_get_int(HCOSE_SIGN1 h, int key, int flags, cose_errback * perror)
	{
	if (!IsValidSign1Handle(h)) {
	if (perror != NULL) perror->err = COSE_ERR_INVALID_HANDLE;
	return NULL;
	}

	return _COSE_map_get_int(&((COSE_Sign1Message *)h)->m_message, key, flags, perror);
	}

	bool COSE_Sign1_map_put_int(HCOSE_SIGN1 h, int key, cn_cbor * value, int flags, cose_errback * perr)
	{
	CHECK_CONDITION(IsValidSign1Handle(h), COSE_ERR_INVALID_HANDLE);
	CHECK_CONDITION(value != NULL, COSE_ERR_INVALID_PARAMETER);

	return _COSE_map_put(&((COSE_Sign1Message *)h)->m_message, key, value, flags, perr);

	errorReturn:
	return false;
	}


	static bool CreateSign1AAD(COSE_Sign1Message * pMessage, byte ** ppbToSign, size_t * pcbToSign, char * szContext, cose_errback * perr)
	{
	cn_cbor * pArray = NULL;
	#ifdef USE_CBOR_CONTEXT
	cn_cbor_context * context = &pMessage->m_message.m_allocContext;
	#endif
	cn_cbor_errback cbor_error;
	cn_cbor * cn = NULL;
	cn_cbor * cn2;
	size_t cbToSign;
	byte * pbToSign = NULL;

	pArray = cn_cbor_array_create(CBOR_CONTEXT_PARAM_COMMA &cbor_error);
	CHECK_CONDITION_CBOR(pArray != NULL, cbor_error);

	cn = cn_cbor_string_create(szContext, CBOR_CONTEXT_PARAM_COMMA &cbor_error);
	CHECK_CONDITION_CBOR(cn != NULL, cbor_error);
	CHECK_CONDITION_CBOR(cn_cbor_array_append(pArray, cn, &cbor_error), cbor_error);
	cn = NULL;

	cn2 = _COSE_arrayget_int(&pMessage->m_message, INDEX_PROTECTED);
	CHECK_CONDITION(cn2 != NULL, COSE_ERR_INVALID_PARAMETER);

	if ((cn2->length == 1) && (cn2->v.bytes[0] == 0xa0)) cn = cn_cbor_data_create(NULL, 0, CBOR_CONTEXT_PARAM_COMMA &cbor_error);
	else cn = cn_cbor_data_create(cn2->v.bytes, (int)cn2->length, CBOR_CONTEXT_PARAM_COMMA &cbor_error);
	CHECK_CONDITION_CBOR(cn != NULL, cbor_error);
	CHECK_CONDITION_CBOR(cn_cbor_array_append(pArray, cn, &cbor_error), cbor_error);
	cn = NULL;

	cn = cn_cbor_data_create(pMessage->m_message.m_pbExternal, (int) pMessage->m_message.m_cbExternal, CBOR_CONTEXT_PARAM_COMMA &cbor_error);
	CHECK_CONDITION_CBOR(cn != NULL, cbor_error);
	CHECK_CONDITION_CBOR(cn_cbor_array_append(pArray, cn, &cbor_error), cbor_error);
	cn = NULL;

	cn2 = _COSE_arrayget_int(&pMessage->m_message, INDEX_BODY);
	cn = cn_cbor_data_create(cn2->v.bytes, (int)cn2->length, CBOR_CONTEXT_PARAM_COMMA &cbor_error);
	CHECK_CONDITION_CBOR(cn != NULL, cbor_error);
	CHECK_CONDITION_CBOR(cn_cbor_array_append(pArray, cn, &cbor_error), cbor_error);
	cn = NULL;


	cbToSign = cn_cbor_encode_size(pArray);
	CHECK_CONDITION(cbToSign > 0, COSE_ERR_CBOR);
	pbToSign = (byte *)COSE_CALLOC(cbToSign, 1, context);
	CHECK_CONDITION(pbToSign != NULL, COSE_ERR_OUT_OF_MEMORY);
	CHECK_CONDITION(cn_cbor_encoder_write(pbToSign, 0, cbToSign, pArray) == cbToSign, COSE_ERR_CBOR);

	*ppbToSign = pbToSign;
	*pcbToSign = cbToSign;
	pbToSign = NULL;

	if (cn != NULL) CN_CBOR_FREE(cn, context);
	if (pArray != NULL) COSE_FREE(pArray, context);
	return true;

	errorReturn:
	if (pbToSign != NULL) COSE_FREE(pbToSign, context);
	if (cn != NULL) CN_CBOR_FREE(cn, context);
	if (pArray != NULL) COSE_FREE(pArray, context);
	return false;
	}

	bool _COSE_Signer0_sign(COSE_Sign1Message * pSigner, const cn_cbor * pKey, cose_errback * perr)
	{
	#ifdef USE_CBOR_CONTEXT
	cn_cbor_context * context = &pSigner->m_message.m_allocContext;
	#endif
	cn_cbor * pcborBody2 = NULL;
	cn_cbor * pcborProtected2 = NULL;
	cn_cbor * pArray = NULL;
	cn_cbor * cn = NULL;
	size_t cbToSign;
	byte * pbToSign = NULL;
	bool f;
	int alg;

	pArray = cn_cbor_array_create(CBOR_CONTEXT_PARAM_COMMA NULL);
	if (pArray == NULL) {
	if (perr != NULL) perr->err = COSE_ERR_OUT_OF_MEMORY;
	errorReturn:
	if (pcborBody2 != NULL) CN_CBOR_FREE(pcborBody2, context);
	if (pcborProtected2 != NULL) CN_CBOR_FREE(pcborProtected2, context);
	if (pArray != NULL) COSE_FREE(pArray, context);
	if (pbToSign != NULL) COSE_FREE(pbToSign, context);
	return false;
	}

	cn = _COSE_map_get_int(&pSigner->m_message, COSE_Header_Algorithm, COSE_BOTH, perr);
	if (cn == NULL) goto errorReturn;

	if (cn->type == CN_CBOR_TEXT) {
	FAIL_CONDITION(COSE_ERR_UNKNOWN_ALGORITHM);
	}
	else {
	CHECK_CONDITION((cn->type == CN_CBOR_UINT \|\| cn->type == CN_CBOR_INT), COSE_ERR_INVALID_PARAMETER);

	alg = (int)cn->v.uint;
	}


	if (!CreateSign1AAD(pSigner, &pbToSign, &cbToSign, "Signature1", perr)) goto errorReturn;

	switch (alg) {
	#ifdef USE_ECDSA_SHA_256
	case COSE_Algorithm_ECDSA_SHA_256:
	f = ECDSA_Sign(&pSigner->m_message, INDEX_SIGNATURE+1, pKey, 256, pbToSign, cbToSign, perr);
	break;
	#endif

	#ifdef USE_ECDSA_SHA_384
	case COSE_Algorithm_ECDSA_SHA_384:
	f = ECDSA_Sign(&pSigner->m_message, INDEX_SIGNATURE+1, pKey, 384, pbToSign, cbToSign, perr);
	break;
	#endif

	#ifdef USE_ECDSA_SHA_512
	case COSE_Algorithm_ECDSA_SHA_512:
	f = ECDSA_Sign(&pSigner->m_message, INDEX_SIGNATURE+1, pKey, 512, pbToSign, cbToSign, perr);
	break;
	#endif
	default:
	FAIL_CONDITION(COSE_ERR_UNKNOWN_ALGORITHM);
	}

	COSE_FREE(pbToSign, context);
	CN_CBOR_FREE(pArray, context);

	return f;
	}

	bool _COSE_Signer0_validate(COSE_Sign1Message * pSign, const cn_cbor * pKey, cose_errback * perr)
	{
	byte * pbToSign = NULL;
	int alg;
	const cn_cbor * cn = NULL;
	#ifdef USE_CBOR_CONTEXT
	cn_cbor_context * context = NULL;
	#endif
	size_t cbToSign;
	bool fRet = false;

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

	cn = _COSE_map_get_int(&pSign->m_message, COSE_Header_Algorithm, COSE_BOTH, perr);
	if (cn == NULL) goto errorReturn;

	if (cn->type == CN_CBOR_TEXT) {
	FAIL_CONDITION(COSE_ERR_UNKNOWN_ALGORITHM);
	}
	else {
	CHECK_CONDITION((cn->type == CN_CBOR_UINT \|\| cn->type == CN_CBOR_INT), COSE_ERR_INVALID_PARAMETER);

	alg = (int)cn->v.uint;
	}

	// Build protected headers

	if (!CreateSign1AAD(pSign, &pbToSign, &cbToSign, "Signature1", perr)) goto errorReturn;

	switch (alg) {
	#ifdef USE_ECDSA_SHA_256
	case COSE_Algorithm_ECDSA_SHA_256:
	if (!ECDSA_Verify(&pSign->m_message, INDEX_SIGNATURE+1, pKey, 256, pbToSign, cbToSign, perr)) goto errorReturn;
	break;
	#endif

	#ifdef USE_ECDSA_SHA_384
	case COSE_Algorithm_ECDSA_SHA_384:
	if (!ECDSA_Verify(&pSign->m_message, INDEX_SIGNATURE+1, pKey, 384, pbToSign, cbToSign, perr)) goto errorReturn;
	break;
	#endif

	#ifdef USE_ECDSA_SHA_512
	case COSE_Algorithm_ECDSA_SHA_512:
	if (!ECDSA_Verify(&pSign->m_message, INDEX_SIGNATURE+1, pKey, 512, pbToSign, cbToSign, perr)) goto errorReturn;
	break;
	#endif

	default:
	FAIL_CONDITION(COSE_ERR_UNKNOWN_ALGORITHM);
	break;
	}

	fRet = true;

	errorReturn:
	if (pbToSign != NULL) COSE_FREE(pbToSign, context);

	return fRet;
	}

	#endif