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/** \file Sign.c
* Contains implementation of the functions related to HCOSE_SIGN handle objects.
*/
#include <stdlib.h>
#include "cose.h"
#include "cose_int.h"
#include "configure.h"
#include "crypto.h"
#if INCLUDE_SIGN0
bool _COSE_Signer0_sign(COSE_Sign0Message * pSigner, const cn_cbor * pKey, cose_errback * perr);
bool _COSE_Signer0_validate(COSE_Sign0Message * pSign, const cn_cbor * pKey, cose_errback * perr);
void _COSE_Sign0_Release(COSE_Sign0Message * p);
COSE * Sign0Root = NULL;
/*! \private
* @brief Test if a HCOSE_SIGN0 handle is valid
*
* Internal function to test if a sign0 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 IsValidSign0Handle(HCOSE_SIGN0 h)
{
COSE_Sign0Message * p = (COSE_Sign0Message *)h;
if (p == NULL) return false;
return _COSE_IsInList(Sign0Root, (COSE *) p);
}
HCOSE_SIGN0 COSE_Sign0_Init(COSE_INIT_FLAGS flags, CBOR_CONTEXT_COMMA cose_errback * perr)
{
CHECK_CONDITION(flags == COSE_INIT_FLAGS_NONE, COSE_ERR_INVALID_PARAMETER);
COSE_Sign0Message * pobj = (COSE_Sign0Message *)COSE_CALLOC(1, sizeof(COSE_Sign0Message), 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_Sign0_Release(pobj);
COSE_FREE(pobj, context);
return NULL;
}
_COSE_InsertInList(&Sign0Root, &pobj->m_message);
return (HCOSE_SIGN0)pobj;
errorReturn:
return NULL;
}
HCOSE_SIGN0 _COSE_Sign0_Init_From_Object(cn_cbor * cbor, COSE_Sign0Message * pIn, CBOR_CONTEXT_COMMA cose_errback * perr)
{
COSE_Sign0Message * pobj = pIn;
cose_errback error = { 0 };
if (perr == NULL) perr = &error;
if (pobj == NULL) pobj = (COSE_Sign0Message *)COSE_CALLOC(1, sizeof(COSE_Sign0Message), 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(&Sign0Root, &pobj->m_message);
return(HCOSE_SIGN0)pobj;
errorReturn:
if (pobj != NULL) {
_COSE_Sign0_Release(pobj);
if (pIn == NULL) COSE_FREE(pobj, context);
}
return NULL;
}
bool COSE_Sign0_Free(HCOSE_SIGN0 h)
{
#ifdef USE_CBOR_CONTEXT
cn_cbor_context context;
#endif
COSE_Sign0Message * pMessage = (COSE_Sign0Message *)h;
if (!IsValidSign0Handle(h)) return false;
// Check reference counting
if (pMessage->m_message.m_refCount > 1) {
pMessage->m_message.m_refCount--;
return true;
}
_COSE_RemoveFromList(&Sign0Root, &pMessage->m_message);
#ifdef USE_CBOR_CONTEXT
context = pMessage->m_message.m_allocContext;
#endif
_COSE_Sign0_Release(pMessage);
COSE_FREE(pMessage, &context);
return true;
}
void _COSE_Sign0_Release(COSE_Sign0Message * p)
{
_COSE_Release(&p->m_message);
}
bool COSE_Sign0_SetContent(HCOSE_SIGN0 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_Sign0Message * pMessage = (COSE_Sign0Message *)h;
bool fRet = false;
CHECK_CONDITION(IsValidSign0Handle(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_Sign0_SetExternal(HCOSE_SIGN0 hcose, const byte * pbExternalData, size_t cbExternalData, cose_errback * perr)
{
if (!IsValidSign0Handle(hcose)) {
if (perr != NULL) perr->err = COSE_ERR_INVALID_HANDLE;
return false;
}
return _COSE_SetExternal(&((COSE_Sign0Message *)hcose)->m_message, pbExternalData, cbExternalData, perr);
}
bool COSE_Sign0_Sign(HCOSE_SIGN0 h, const cn_cbor * pKey, cose_errback * perr)
{
#ifdef USE_CBOR_CONTEXT
// cn_cbor_context * context = NULL;
#endif
COSE_Sign0Message * pMessage = (COSE_Sign0Message *)h;
const cn_cbor * pcborProtected;
if (!IsValidSign0Handle(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_Sign0_validate(HCOSE_SIGN0 hSign, const cn_cbor * pKey, cose_errback * perr)
{
bool f;
COSE_Sign0Message * pSign;
const cn_cbor * cnContent;
const cn_cbor * cnProtected;
CHECK_CONDITION(IsValidSign0Handle(hSign), COSE_ERR_INVALID_HANDLE);
pSign = (COSE_Sign0Message *)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_Sign0_map_get_int(HCOSE_SIGN0 h, int key, int flags, cose_errback * perror)
{
if (!IsValidSign0Handle(h)) {
if (perror != NULL) perror->err = COSE_ERR_INVALID_HANDLE;
return NULL;
}
return _COSE_map_get_int(&((COSE_Sign0Message *)h)->m_message, key, flags, perror);
}
bool COSE_Sign0_map_put_int(HCOSE_SIGN0 h, int key, cn_cbor * value, int flags, cose_errback * perr)
{
CHECK_CONDITION(IsValidSign0Handle(h), COSE_ERR_INVALID_HANDLE);
CHECK_CONDITION(value != NULL, COSE_ERR_INVALID_PARAMETER);
return _COSE_map_put(&((COSE_Sign0Message *)h)->m_message, key, value, flags, perr);
errorReturn:
return false;
}
static bool CreateSign0AAD(COSE_Sign0Message * 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_Sign0Message * 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 (!CreateSign0AAD(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_Sign0Message * 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 (!CreateSign0AAD(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