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

 /** \file Sign1.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 "cose_crypto.h"

 #if INCLUDE_SIGN1

 bool _COSE_Signer1_sign(COSE_Sign1Message *pSigner,
 	const cn_cbor *pKey,
 	cose_errback *perr);
 bool _COSE_Signer1_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_Signer1_sign(pMessage, pKey, perr)) {
 		goto errorReturn;
 	}

 #if INCLUDE_COUNTERSIGNATURE
 	if (pMessage->m_message.m_counterSigners != NULL) {
 		if (!_COSE_CounterSign_Sign(
 				&pMessage->m_message, CBOR_CONTEXT_PARAM_COMMA perr)) {
 			goto errorReturn;
 		}
 	}
 #endif

 	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_Signer1_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) ==
 						(ssize_t)cbToSign,
 		COSE_ERR_CBOR);

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

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

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

 bool _COSE_Signer1_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

 #ifdef USE_EDDSA
 		case COSE_Algorithm_EdDSA:
 			f = EdDSA_Sign(&pSigner->m_message, INDEX_SIGNATURE + 1, pKey,
 				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_Signer1_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

 #ifdef USE_EDDSA
 		case COSE_Algorithm_EdDSA:
 			if (!EdDSA_Verify(&pSign->m_message, INDEX_SIGNATURE + 1, pKey,
 					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 Sign1.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 "cose_crypto.h"

	#if INCLUDE_SIGN1

	bool _COSE_Signer1_sign(COSE_Sign1Message *pSigner,
	const cn_cbor *pKey,
	cose_errback *perr);
	bool _COSE_Signer1_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_Signer1_sign(pMessage, pKey, perr)) {
	goto errorReturn;
	}

	#if INCLUDE_COUNTERSIGNATURE
	if (pMessage->m_message.m_counterSigners != NULL) {
	if (!_COSE_CounterSign_Sign(
	&pMessage->m_message, CBOR_CONTEXT_PARAM_COMMA perr)) {
	goto errorReturn;
	}
	}
	#endif

	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_Signer1_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) ==
	(ssize_t)cbToSign,
	COSE_ERR_CBOR);

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

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

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

	bool _COSE_Signer1_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

	#ifdef USE_EDDSA
	case COSE_Algorithm_EdDSA:
	f = EdDSA_Sign(&pSigner->m_message, INDEX_SIGNATURE + 1, pKey,
	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_Signer1_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

	#ifdef USE_EDDSA
	case COSE_Algorithm_EdDSA:
	if (!EdDSA_Verify(&pSign->m_message, INDEX_SIGNATURE + 1, pKey,
	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