blob: 1e4d3cc32ac12cc32f16105b89abe18f4371a0f2 [file] [log] [blame]
#include <stdlib.h>
#ifndef __MBED__
#include <memory.h>
#endif
#include "cose.h"
#include "cose_int.h"
#include "configure.h"
#include "crypto.h"
bool IsValidCOSEHandle(HCOSE h)
{
COSE_Encrypt * p = (COSE_Encrypt *)h;
if (p == NULL) return false;
return true;
}
bool _COSE_Init(COSE_INIT_FLAGS flags, COSE* pobj, int msgType, CBOR_CONTEXT_COMMA cose_errback * perr)
{
cn_cbor_errback errState;;
#ifdef USE_CBOR_CONTEXT
if (context != NULL) pobj->m_allocContext = *context;
#endif
CHECK_CONDITION((flags & ~(COSE_INIT_FLAGS_DETACHED_CONTENT | COSE_INIT_FLAGS_NO_CBOR_TAG)) == 0, COSE_ERR_INVALID_PARAMETER);
pobj->m_flags = flags;
pobj->m_protectedMap = cn_cbor_map_create(CBOR_CONTEXT_PARAM_COMMA &errState);
CHECK_CONDITION_CBOR(pobj->m_protectedMap != NULL, errState);
pobj->m_dontSendMap = cn_cbor_map_create(CBOR_CONTEXT_PARAM_COMMA &errState);
CHECK_CONDITION_CBOR(pobj->m_dontSendMap != NULL, errState);
pobj->m_cborRoot = pobj->m_cbor = cn_cbor_array_create(CBOR_CONTEXT_PARAM_COMMA &errState);
CHECK_CONDITION_CBOR(pobj->m_cbor != NULL, errState);
pobj->m_ownMsg = 1;
pobj->m_msgType = msgType;
pobj->m_unprotectMap = cn_cbor_map_create(CBOR_CONTEXT_PARAM_COMMA &errState);
CHECK_CONDITION_CBOR(pobj->m_unprotectMap != NULL, errState);
CHECK_CONDITION_CBOR(_COSE_array_replace(pobj, pobj->m_unprotectMap, INDEX_UNPROTECTED, CBOR_CONTEXT_PARAM_COMMA &errState), errState);
pobj->m_ownUnprotectedMap = false;
if (!(flags & COSE_INIT_FLAGS_NO_CBOR_TAG)) {
cn_cbor_errback cbor_error;
cn_cbor * cn = cn_cbor_tag_create(msgType, pobj->m_cborRoot, CBOR_CONTEXT_PARAM_COMMA &cbor_error);
CHECK_CONDITION_CBOR(cn != NULL, cbor_error);
pobj->m_cborRoot = cn;
}
pobj->m_refCount = 1;
return true;
errorReturn:
return false;
}
bool _COSE_Init_From_Object(COSE* pobj, cn_cbor * pcbor, CBOR_CONTEXT_COMMA cose_errback * perr)
{
const cn_cbor * pmap = NULL;
cn_cbor_errback errState; // = { 0 };
cn_cbor_errback cbor_error;
#ifdef USE_CBOR_CONTEXT
if (context != NULL) pobj->m_allocContext = *context;
#endif
pobj->m_cborRoot = pcbor;
pobj->m_cbor = pcbor;
// Check if we have a tag
if (pcbor->type == CN_CBOR_TAG) {
pcbor = pobj->m_cbor = pcbor->first_child;
}
pmap = _COSE_arrayget_int(pobj, INDEX_PROTECTED);
CHECK_CONDITION(pmap != NULL, COSE_ERR_INVALID_PARAMETER);
if (pmap != NULL) {
CHECK_CONDITION(pmap->type == CN_CBOR_BYTES, COSE_ERR_INVALID_PARAMETER);
if (pmap->length == 0) {
pobj->m_protectedMap = cn_cbor_map_create(CBOR_CONTEXT_PARAM_COMMA NULL);
CHECK_CONDITION(pobj->m_protectedMap, COSE_ERR_OUT_OF_MEMORY);
}
else {
pobj->m_protectedMap = cn_cbor_decode((const byte *)pmap->v.str, pmap->length, CBOR_CONTEXT_PARAM_COMMA &errState);
CHECK_CONDITION(pobj->m_protectedMap != NULL, COSE_ERR_INVALID_PARAMETER);
}
}
pobj->m_unprotectMap = _COSE_arrayget_int(pobj, INDEX_UNPROTECTED);
CHECK_CONDITION((pobj->m_unprotectMap != NULL) && (pobj->m_unprotectMap->type == CN_CBOR_MAP), COSE_ERR_INVALID_PARAMETER);
pobj->m_ownUnprotectedMap = false;
pobj->m_dontSendMap = cn_cbor_map_create(CBOR_CONTEXT_PARAM_COMMA &cbor_error);
CHECK_CONDITION_CBOR(pobj->m_dontSendMap != NULL, cbor_error);
pobj->m_ownMsg = true;
pobj->m_refCount = 1;
return true;
errorReturn:
return false;
}
void _COSE_Release(COSE * pobj)
{
#ifdef USE_CBOR_CONTEXT
cn_cbor_context * context = &pobj->m_allocContext;
#endif
if (pobj->m_protectedMap != NULL) CN_CBOR_FREE(pobj->m_protectedMap, context);
if (pobj->m_ownUnprotectedMap && (pobj->m_unprotectMap != NULL)) CN_CBOR_FREE(pobj->m_unprotectMap, context);
if (pobj->m_dontSendMap != NULL) CN_CBOR_FREE(pobj->m_dontSendMap, context);
if (pobj->m_ownMsg && (pobj->m_cborRoot != NULL) && (pobj->m_cborRoot->parent == NULL)) CN_CBOR_FREE(pobj->m_cborRoot, context);
}
HCOSE COSE_Decode(const byte * rgbData, size_t cbData, int * ptype, COSE_object_type struct_type, CBOR_CONTEXT_COMMA cose_errback * perr)
{
cn_cbor * cbor = NULL;
cn_cbor * cborRoot = NULL;
cn_cbor_errback cbor_err;
HCOSE h;
CHECK_CONDITION((rgbData != NULL) && (ptype != NULL), COSE_ERR_INVALID_PARAMETER);
cbor = cborRoot = cn_cbor_decode(rgbData, cbData, CBOR_CONTEXT_PARAM_COMMA &cbor_err);
CHECK_CONDITION_CBOR(cbor != NULL, cbor_err);
if (cbor->type == CN_CBOR_TAG) {
if (struct_type != 0) {
CHECK_CONDITION(struct_type == (COSE_object_type) cbor->v.sint, COSE_ERR_INVALID_PARAMETER);
}
else struct_type = cbor->v.uint;
*ptype = struct_type;
cbor = cbor->first_child;
}
else {
*ptype = struct_type;
}
CHECK_CONDITION(cbor->type == CN_CBOR_ARRAY, COSE_ERR_INVALID_PARAMETER);
switch (*ptype) {
case COSE_enveloped_object:
#if INCLUDE_ENCRYPT
h = (HCOSE)_COSE_Enveloped_Init_From_Object(cbor, NULL, CBOR_CONTEXT_PARAM_COMMA perr);
if (h == NULL) {
goto errorReturn;
}
#else
FAIL_CONDITION(COSE_ERR_UNSUPPORTED_COSE_TYPE);
#endif
break;
case COSE_sign_object:
#if INCLUDE_SIGN
h = (HCOSE)_COSE_Sign_Init_From_Object(cborRoot, NULL, CBOR_CONTEXT_PARAM_COMMA perr);
if (h == NULL) {
goto errorReturn;
}
#else
FAIL_CONDITION(COSE_ERR_UNSUPPORTED_COSE_TYPE);
#endif
break;
case COSE_sign0_object:
#if INCLUDE_SIGN0
h = (HCOSE)_COSE_Sign0_Init_From_Object(cborRoot, NULL, CBOR_CONTEXT_PARAM_COMMA perr);
if (h == NULL) {
goto errorReturn;
}
#else
FAIL_CONDITION(COSE_ERR_UNSUPPORTED_COSE_TYPE);
#endif
break;
case COSE_mac_object:
#if INCLUDE_MAC
h = (HCOSE)_COSE_Mac_Init_From_Object(cbor, NULL, CBOR_CONTEXT_PARAM_COMMA perr);
if (h == NULL) {
goto errorReturn;
}
#else
FAIL_CONDITION(COSE_ERR_UNSUPPORTED_COSE_TYPE);
#endif
break;
case COSE_mac0_object:
#if INCLUDE_MAC0
h = (HCOSE)_COSE_Mac0_Init_From_Object(cbor, NULL, CBOR_CONTEXT_PARAM_COMMA perr);
if (h == NULL) {
goto errorReturn;
}
#else
FAIL_CONDITION(COSE_ERR_UNSUPPORTED_COSE_TYPE);
#endif
break;
case COSE_encrypt_object:
#if INCLUDE_ENCRYPT0
h = (HCOSE)_COSE_Encrypt_Init_From_Object(cbor, NULL, CBOR_CONTEXT_PARAM_COMMA perr);
if (h == NULL) {
goto errorReturn;
}
#else
FAIL_CONDITION(COSE_ERR_UNSUPPORTED_COSE_TYPE);
#endif
break;
default:
FAIL_CONDITION(COSE_ERR_INVALID_PARAMETER);
}
return h;
errorReturn:
COSE_FREE(cbor, context);
return NULL;
}
size_t COSE_Encode(HCOSE msg, byte * rgb, size_t ib, size_t cb)
{
if (rgb == NULL) return cn_cbor_encode_size(((COSE *)msg)->m_cbor) + ib;
ssize_t size = cn_cbor_encoder_write(rgb, ib, cb, ((COSE*)msg)->m_cbor);
return size >= 0 ? size : 0;
}
cn_cbor * COSE_get_cbor(HCOSE h)
{
COSE * msg = (COSE *)h;
if (!IsValidCOSEHandle(h)) return NULL;
return msg->m_cbor;
}
bool _COSE_SetExternal(COSE * pcose, const byte * pbExternalData, size_t cbExternalData, cose_errback * perr)
{
(void) perr;
pcose->m_pbExternal = pbExternalData;
pcose->m_cbExternal = cbExternalData;
return true;
}
cn_cbor * _COSE_map_get_int(COSE * pcose, int key, int flags, cose_errback * perror)
{
cn_cbor * p = NULL;
if (perror != NULL) perror->err = COSE_ERR_NONE;
if ((pcose->m_protectedMap != NULL) && ((flags & COSE_PROTECT_ONLY) != 0)) {
p = cn_cbor_mapget_int(pcose->m_protectedMap, key);
if (p != NULL) return p;
}
if ((pcose->m_unprotectMap != NULL) && ((flags & COSE_UNPROTECT_ONLY) != 0)) {
p = cn_cbor_mapget_int(pcose->m_unprotectMap, key);
if (p != NULL) return p;
}
if ((pcose->m_dontSendMap != NULL) && ((flags & COSE_DONT_SEND) != 0)) {
p = cn_cbor_mapget_int(pcose->m_dontSendMap, key);
}
if ((p == NULL) && (perror != NULL)) perror->err = COSE_ERR_INVALID_PARAMETER;
return p;
}
cn_cbor * _COSE_map_get_str(COSE * pcose, const char * key, int flags, cose_errback * perror)
{
cn_cbor * p = NULL;
if (perror != NULL) perror->err = COSE_ERR_NONE;
if ((pcose->m_protectedMap != NULL) && ((flags & COSE_PROTECT_ONLY) != 0)) {
p = cn_cbor_mapget_string(pcose->m_protectedMap, key);
if (p != NULL) return p;
}
if ((pcose->m_unprotectMap != NULL) && ((flags & COSE_UNPROTECT_ONLY) != 0)) {
p = cn_cbor_mapget_string(pcose->m_unprotectMap, key);
}
if ((pcose->m_dontSendMap != NULL) && ((flags & COSE_DONT_SEND) != 0)) {
p = cn_cbor_mapget_string(pcose->m_dontSendMap, key);
}
return p;
}
bool _COSE_map_put(COSE * pCose, int key, cn_cbor * value, int flags, cose_errback * perr)
{
#ifdef USE_CBOR_CONTEXT
cn_cbor_context * context = &pCose->m_allocContext;
#endif
cn_cbor_errback error;
bool f = false;
CHECK_CONDITION(value != NULL, COSE_ERR_INVALID_PARAMETER);
CHECK_CONDITION(cn_cbor_mapget_int(pCose->m_protectedMap, key) == NULL, COSE_ERR_INVALID_PARAMETER);
CHECK_CONDITION(cn_cbor_mapget_int(pCose->m_unprotectMap, key) == NULL, COSE_ERR_INVALID_PARAMETER);
CHECK_CONDITION(cn_cbor_mapget_int(pCose->m_dontSendMap, key) == NULL, COSE_ERR_INVALID_PARAMETER);
switch (flags) {
case COSE_PROTECT_ONLY:
f = cn_cbor_mapput_int(pCose->m_protectedMap, key, value, CBOR_CONTEXT_PARAM_COMMA &error);
break;
case COSE_UNPROTECT_ONLY:
f = cn_cbor_mapput_int(pCose->m_unprotectMap, key, value, CBOR_CONTEXT_PARAM_COMMA &error);
break;
case COSE_DONT_SEND:
f = cn_cbor_mapput_int(pCose->m_dontSendMap, key, value, CBOR_CONTEXT_PARAM_COMMA &error);
break;
default:
FAIL_CONDITION(COSE_ERR_INVALID_PARAMETER);
break;
}
CHECK_CONDITION(f, _MapFromCBOR(error));
errorReturn:
return f;
}
cn_cbor * _COSE_encode_protected(COSE * pMessage, cose_errback * perr)
{
cn_cbor * pProtected;
int cbProtected;
byte * pbProtected = NULL;
#ifdef USE_CBOR_CONTEXT
cn_cbor_context * context = &pMessage->m_allocContext;
#endif // USE_CBOR_CONTEXT
pProtected = cn_cbor_index(pMessage->m_cbor, INDEX_PROTECTED);
if ((pProtected != NULL) &&(pProtected->type != CN_CBOR_INVALID)) {
errorReturn:
if (pbProtected != NULL) COSE_FREE(pbProtected, context);
return pProtected;
}
if (pMessage->m_protectedMap->length > 0) {
cbProtected = cn_cbor_encode_size(pMessage->m_protectedMap);
pbProtected = (byte *)COSE_CALLOC(cbProtected, 1, context);
CHECK_CONDITION(pbProtected != NULL, COSE_ERR_OUT_OF_MEMORY);
CHECK_CONDITION(cn_cbor_encoder_write(pbProtected, 0, cbProtected, pMessage->m_protectedMap) == cbProtected, COSE_ERR_CBOR);
}
else {
cbProtected = 0;
}
pProtected = cn_cbor_data_create(pbProtected, cbProtected, CBOR_CONTEXT_PARAM_COMMA NULL);
CHECK_CONDITION(pProtected != NULL, COSE_ERR_OUT_OF_MEMORY);
pbProtected = NULL;
CHECK_CONDITION(_COSE_array_replace(pMessage, pProtected, INDEX_PROTECTED, CBOR_CONTEXT_PARAM_COMMA NULL), COSE_ERR_CBOR);
return pProtected;
}
#ifdef USE_COUNTER_SIGNATURES
bool _COSE_CounterSign_add(COSE * pMessage, HCOSE_COUNTERSIGN hSigner, cose_errback * perr)
{
COSE_CounterSign * pSigner = (COSE_CounterSign *)hSigner;
CHECK_CONDITION(IsValidCounterSignHandle(hSigner), COSE_ERR_INVALID_HANDLE);
CHECK_CONDITION(pSigner->m_signer.m_signerNext == NULL, COSE_ERR_INVALID_PARAMETER);
pSigner = pMessage->m_counterSigners;
pMessage->m_counterSigners = pSigner;
return true;
errorReturn:
return false;
}
HCOSE_COUNTERSIGN _COSE_CounterSign_get(COSE * pMessage, int iSigner, cose_errback * perr)
{
COSE_CounterSign * pSigner = pMessage->m_counterSigners;
int i;
for (i = 0; i < iSigner; i++, pSigner = pSigner->m_next) {
CHECK_CONDITION(pSigner != NULL, COSE_ERR_INVALID_PARAMETER);
}
return (HCOSE_COUNTERSIGN) pSigner;
errorReturn:
return false;
}
bool _COSE_CountSign_create(COSE * pMessage, cn_cbor * pcnBody, CBOR_CONTEXT_COMMA cose_errback * perr)
{
cn_cbor * pArray = NULL;
cn_cbor_errback cbor_err;
COSE_CounterSign * pSigner = NULL;
cn_cbor * pcnProtected = NULL;
cn_cbor * pcn = NULL;
cn_cbor * pcn2 = NULL;
if (pMessage->m_counterSigners == NULL) return true;
// One or more than one?
if (pMessage->m_counterSigners->m_signer.m_signerNext != NULL) {
pArray = cn_cbor_array_create(CBOR_CONTEXT_PARAM_COMMA &cbor_err);
CHECK_CONDITION_CBOR(pArray != NULL, cbor_err);
}
pcnProtected = _COSE_arrayget_int(pMessage, INDEX_PROTECTED);
CHECK_CONDITION(pcnProtected != NULL, COSE_ERR_INTERNAL);
for (pSigner = pMessage->m_counterSigners; pSigner != NULL; pSigner = pSigner->m_next) {
CHECK_CONDITION(pSigner->m_signer.m_signerNext == NULL, COSE_ERR_INTERNAL);
pcn = cn_cbor_data_create(pcnProtected->v.bytes, pcnProtected->v.count, CBOR_CONTEXT_PARAM_COMMA &cbor_err);
CHECK_CONDITION_CBOR(pcnProtected != NULL, cbor_err);
pcn2 = cn_cbor_clone(pcnBody, CBOR_CONTEXT_PARAM_COMMA &cbor_err);
CHECK_CONDITION_CBOR(pcnBody != NULL, cbor_err);
if (!_COSE_Signer_sign(&pSigner->m_signer, pcnBody, pcn2, perr)) goto errorReturn;
pcn = NULL;
pcn2 = NULL;
if (pArray != NULL) {
bool f = cn_cbor_array_append(pArray, pSigner->m_signer.m_message.m_cborRoot, &cbor_err);
CHECK_CONDITION_CBOR(f, cbor_err);
}
else {
pArray = pSigner->m_signer.m_message.m_cborRoot;
}
}
if (!_COSE_map_put(pMessage, COSE_Header_CounterSign, pArray, COSE_UNPROTECT_ONLY, perr)) goto errorReturn;
return true;
errorReturn:
if (pArray != NULL) CN_CBOR_FREE(pArray, context);
if ((pcn != NULL) && (pcn->parent != NULL)) CN_CBOR_FREE(pcn, context);
if ((pcn2 != NULL) && (pcn2->parent != NULL)) CN_CBOR_FREE(pcn2, context);
return false;
}
#endif
bool _COSE_array_replace(COSE * pMessage, cn_cbor * cb_value, int index, CBOR_CONTEXT_COMMA cn_cbor_errback * errp)
{
return cn_cbor_array_replace(pMessage->m_cbor, cb_value, index, CBOR_CONTEXT_PARAM_COMMA errp);
}
cn_cbor * _COSE_arrayget_int(COSE * pMessage, int index)
{
return cn_cbor_index(pMessage->m_cbor, index);
}
cose_error _MapFromCBOR(cn_cbor_errback err)
{
switch (err.err) {
case CN_CBOR_ERR_INVALID_PARAMETER:
return COSE_ERR_INVALID_PARAMETER;
case CN_CBOR_ERR_OUT_OF_MEMORY:
return COSE_ERR_OUT_OF_MEMORY;
default:
return COSE_ERR_CBOR;
}
}
void _COSE_InsertInList(COSE ** root, COSE * newMsg)
{
if (*root == NULL) {
*root = newMsg;
return;
}
newMsg->m_handleList = *root;
*root = newMsg;
return;
}
bool _COSE_IsInList(COSE * root, COSE * thisMsg)
{
COSE * walk;
if (root == NULL) return false;
if (thisMsg == NULL) return false;
for (walk = root; walk != NULL; walk = walk->m_handleList) {
if (walk == thisMsg) return true;
}
return false;
}
void _COSE_RemoveFromList(COSE ** root, COSE * thisMsg)
{
COSE * walk;
if (*root == thisMsg) {
*root = thisMsg->m_handleList;
thisMsg->m_handleList = NULL;
return;
}
for (walk = *root; walk->m_handleList != NULL; walk = walk->m_handleList) {
if (walk->m_handleList == thisMsg) {
walk->m_handleList = thisMsg->m_handleList;
thisMsg->m_handleList = NULL;
return;
}
}
return;
}