blob: f7f7059ec15b53c6404c0e5a127b80dd746b9760 [file] [log] [blame]
/** \file Encrypt.c
* Contains implementation of the functions related to HCOSE_ENVELOPED handle objects.
*/
#include <stdlib.h>
#include <memory.h>
#include <stdio.h>
#include <assert.h>
#include "cose.h"
#include "cose_int.h"
#include "configure.h"
#include "crypto.h"
void _COSE_Enveloped_Release(COSE_Enveloped * p);
byte RgbDontUse[8 * 1024]; // Remove this array when we can compute the size of a cbor serialization without this hack.
COSE * EnvelopedRoot = NULL;
/*! \private
* @brief Test if a HCOSE_ENVELOPED handle is valid
*
* Internal function to test if a enveloped 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 IsValidEnvelopedHandle(HCOSE_ENVELOPED h)
{
COSE_Enveloped * p = (COSE_Enveloped *)h;
return _COSE_IsInList(EnvelopedRoot, (COSE *) p);
}
/*!
* @brief Allocate and initialize an object for creation of an Enveloped message object
*
* Allocate and initialize the object used to create a COSE Enveloped message object.
* Supported flags are:
* COSE_INIT_FLAG_DETACHED_CONTENT - content is not part of the message
* COSE_INIT_NO_CBOR_FLAG - Do not emit the leading CBOR tag on the message.
*
* See the notes on the memory model for the use of the context variable.
* Applications need to free the returned handle before deallocating the
* memory block that it was wrapped in for correct handle checking.
*
* @param flags Set of initialization flags from the COSE_INIT_FLAGS enum
* @param context CN_CBOR context allocator struture
* @param perr Location to return error specific information
* @returns handle to the newly allocated object
*/
HCOSE_ENVELOPED COSE_Enveloped_Init(COSE_INIT_FLAGS flags, CBOR_CONTEXT_COMMA cose_errback * perr)
{
COSE_Enveloped * pobj = (COSE_Enveloped *)COSE_CALLOC(1, sizeof(COSE_Enveloped), context);
CHECK_CONDITION(pobj != NULL, COSE_ERR_OUT_OF_MEMORY);
if (!_COSE_Init(flags,&pobj->m_message, COSE_enveloped_object, CBOR_CONTEXT_PARAM_COMMA perr)) {
_COSE_Enveloped_Release(pobj);
COSE_FREE(pobj, context);
return NULL;
}
_COSE_InsertInList(&EnvelopedRoot, &pobj->m_message);
return (HCOSE_ENVELOPED) pobj;
errorReturn:
return NULL;
}
HCOSE_ENVELOPED _COSE_Enveloped_Init_From_Object(cn_cbor * cbor, COSE_Enveloped * pIn, CBOR_CONTEXT_COMMA cose_errback * perr)
{
COSE_Enveloped * pobj = pIn;
cn_cbor * pRecipients = NULL;
cose_errback error = { 0 };
if (perr == NULL) perr = &error;
if (pobj == NULL) pobj = (COSE_Enveloped *)COSE_CALLOC(1, sizeof(COSE_Enveloped), context);
if (pobj == NULL) {
perr->err = COSE_ERR_OUT_OF_MEMORY;
errorReturn:
if (pobj != NULL) {
_COSE_Enveloped_Release(pobj);
if (pIn == NULL) COSE_FREE(pobj, context);
}
return NULL;
}
if (!_COSE_Init_From_Object(&pobj->m_message, cbor, CBOR_CONTEXT_PARAM_COMMA perr)) {
goto errorReturn;
}
pRecipients = _COSE_arrayget_int(&pobj->m_message, INDEX_RECIPIENTS);
if (pRecipients != NULL) {
CHECK_CONDITION(pRecipients->type == CN_CBOR_ARRAY, COSE_ERR_INVALID_PARAMETER);
pRecipients = pRecipients->first_child;
while (pRecipients != NULL) {
COSE_RecipientInfo * pInfo = _COSE_Recipient_Init_From_Object(pRecipients, CBOR_CONTEXT_PARAM_COMMA perr);
CHECK_CONDITION(pInfo != NULL, COSE_ERR_OUT_OF_MEMORY);
pInfo->m_recipientNext = pobj->m_recipientFirst;
pobj->m_recipientFirst = pInfo;
pRecipients = pRecipients->next;
}
}
if (pIn == NULL) _COSE_InsertInList(&EnvelopedRoot, &pobj->m_message);
return(HCOSE_ENVELOPED) pobj;
}
bool COSE_Enveloped_Free(HCOSE_ENVELOPED h)
{
#ifdef USE_CBOR_CONTEXT
cn_cbor_context context;
#endif
COSE_Enveloped * p = (COSE_Enveloped *)h;
if (!IsValidEnvelopedHandle(h)) return false;
if (p->m_message.m_refCount > 1) {
p->m_message.m_refCount--;
return true;
}
#ifdef USE_CBOR_CONTEXT
context = ((COSE_Enveloped *)h)->m_message.m_allocContext;
#endif
_COSE_RemoveFromList(&EnvelopedRoot, &p->m_message);
_COSE_Enveloped_Release((COSE_Enveloped *)h);
COSE_FREE((COSE_Enveloped *)h, &context);
return true;
}
void _COSE_Enveloped_Release(COSE_Enveloped * p)
{
COSE_RecipientInfo * pRecipient1;
COSE_RecipientInfo * pRecipient2;
if (p->pbContent != NULL) COSE_FREE((void *) p->pbContent, &p->m_message.m_allocContext);
// if (p->pbIV != NULL) COSE_FREE(p->pbIV, &p->m_message.m_allocContext);
for (pRecipient1 = p->m_recipientFirst; pRecipient1 != NULL; pRecipient1 = pRecipient2) {
pRecipient2 = pRecipient1->m_recipientNext;
COSE_Recipient_Free((HCOSE_RECIPIENT)pRecipient1);
}
_COSE_Release(&p->m_message);
}
bool COSE_Enveloped_decrypt(HCOSE_ENVELOPED h, HCOSE_RECIPIENT hRecip, cose_errback * perr)
{
COSE_Enveloped * pcose = (COSE_Enveloped *)h;
COSE_RecipientInfo * pRecip = (COSE_RecipientInfo *)hRecip;
bool f = false;
CHECK_CONDITION(IsValidEnvelopedHandle(h), COSE_ERR_INVALID_HANDLE);
CHECK_CONDITION(IsValidRecipientHandle(hRecip), COSE_ERR_INVALID_HANDLE);
CHECK_CONDITION(pcose->m_recipientFirst != NULL, COSE_ERR_INVALID_PARAMETER);
f = _COSE_Enveloped_decrypt(pcose, pRecip, NULL, 0, "Enveloped", perr);
errorReturn:
return f;
}
bool _COSE_Enveloped_decrypt(COSE_Enveloped * pcose, COSE_RecipientInfo * pRecip, byte *pbKeyIn, size_t cbKeyIn, const char * szContext, cose_errback * perr)
{
int alg;
const cn_cbor * cn = NULL;
byte * pbKey = pbKeyIn;
size_t cbitKey = cbKeyIn * 8;
#ifdef USE_CBOR_CONTEXT
cn_cbor_context * context;
#endif
byte * pbAuthData = NULL;
size_t cbAuthData;
#ifdef USE_CBOR_CONTEXT
context = &pcose->m_message.m_allocContext;
#endif
CHECK_CONDITION(!((pRecip != NULL) && (pbKeyIn != NULL)), COSE_ERR_INTERNAL);
cn = _COSE_map_get_int(&pcose->m_message, COSE_Header_Algorithm, COSE_BOTH, perr);
if (cn == NULL) {
error:
errorReturn:
if (pbAuthData != NULL) COSE_FREE(pbAuthData, context);
if ((pbKey != NULL) && (pbKeyIn == NULL)) {
memset(pbKey, 0xff, cbitKey / 8);
COSE_FREE(pbKey, context);
}
return false;
}
CHECK_CONDITION((cn->type == CN_CBOR_UINT) || (cn->type == CN_CBOR_INT), COSE_ERR_INVALID_PARAMETER);
alg = (int) cn->v.uint;
switch (alg) {
#ifdef USE_AES_CCM_16_64_128
case COSE_Algorithm_AES_CCM_16_64_128:
cbitKey = 128;
break;
#endif
#ifdef USE_AES_CCM_16_128_128
case COSE_Algorithm_AES_CCM_16_128_128:
cbitKey = 128;
break;
#endif
#ifdef USE_AES_CCM_64_64_128
case COSE_Algorithm_AES_CCM_64_64_128:
cbitKey = 128;
break;
#endif
#ifdef USE_AES_CCM_64_128_128
case COSE_Algorithm_AES_CCM_64_128_128:
cbitKey = 128;
break;
#endif
#ifdef USE_AES_CCM_64_64_256
case COSE_Algorithm_AES_CCM_64_64_256:
cbitKey = 256;
break;
#endif
#ifdef USE_AES_CCM_16_128_256
case COSE_Algorithm_AES_CCM_16_128_256:
cbitKey = 256;
break;
#endif
#ifdef USE_AES_CCM_64_128_256
case COSE_Algorithm_AES_CCM_64_128_256:
cbitKey = 256;
break;
#endif
#ifdef USE_AES_CCM_16_64_256
case COSE_Algorithm_AES_CCM_16_64_256:
cbitKey = 256;
break;
#endif
#ifdef USE_AES_GCM_128
case COSE_Algorithm_AES_GCM_128:
cbitKey = 128;
break;
#endif
#ifdef USE_AES_GCM_192
case COSE_Algorithm_AES_GCM_192:
cbitKey = 192;
break;
#endif
#ifdef USE_AES_GCM_256
case COSE_Algorithm_AES_GCM_256:
cbitKey = 256;
break;
#endif
default:
FAIL_CONDITION(COSE_ERR_UNKNOWN_ALGORITHM);
break;
}
//
// We are doing the enveloped item - so look for the passed in recipient
//
if (pbKeyIn == NULL) {
// Allocate the key if we have not already done so
if (pbKey == NULL) {
pbKey = COSE_CALLOC(cbitKey / 8, 1, context);
CHECK_CONDITION(pbKey != NULL, COSE_ERR_OUT_OF_MEMORY);
}
// If there is a recipient - ask it for the key
if (pRecip != NULL) {
COSE_RecipientInfo * pRecipX;
for (pRecipX = pcose->m_recipientFirst; pRecipX != NULL; pRecipX = pRecipX->m_recipientNext) {
if (pRecipX == pRecip) {
if (!_COSE_Recipient_decrypt(pRecipX, pRecip, alg, cbitKey, pbKey, perr)) goto errorReturn;
break;
}
else if (pRecipX->m_recipientNext != NULL) {
if (_COSE_Recipient_decrypt(pRecipX, pRecip, alg, cbitKey, pbKey, perr)) break;
}
}
CHECK_CONDITION(pRecipX != NULL, COSE_ERR_NO_RECIPIENT_FOUND);
}
else {
for (pRecip = pcose->m_recipientFirst; pRecip != NULL; pRecip = pRecip->m_recipientNext) {
if (_COSE_Recipient_decrypt(pRecip, NULL, alg, cbitKey, pbKey, perr)) break;
}
CHECK_CONDITION(pRecip != NULL, COSE_ERR_NO_RECIPIENT_FOUND);
}
}
// Build authenticated data
if (!_COSE_Encrypt_Build_AAD(&pcose->m_message, &pbAuthData, &cbAuthData, szContext, perr)) goto errorReturn;
cn = _COSE_arrayget_int(&pcose->m_message, INDEX_BODY);
CHECK_CONDITION(cn != NULL, COSE_ERR_INVALID_PARAMETER);
switch (alg) {
#ifdef USE_AES_CCM_16_64_128
case COSE_Algorithm_AES_CCM_16_64_128:
if (!AES_CCM_Decrypt(pcose, 64, 16, pbKey, cbitKey / 8, cn->v.bytes, cn->length, pbAuthData, cbAuthData, perr)) goto error;
break;
#endif
#ifdef USE_AES_CCM_16_64_256
case COSE_Algorithm_AES_CCM_16_64_256:
if (!AES_CCM_Decrypt(pcose, 64, 16, pbKey, cbitKey / 8, cn->v.bytes, cn->length, pbAuthData, cbAuthData, perr)) goto error;
break;
#endif
#ifdef USE_AES_CCM_16_128_128
case COSE_Algorithm_AES_CCM_16_128_128:
if (!AES_CCM_Decrypt(pcose, 128, 16, pbKey, cbitKey / 8, cn->v.bytes, cn->length, pbAuthData, cbAuthData, perr)) goto error;
break;
#endif
#ifdef USE_AES_CCM_16_128_256
case COSE_Algorithm_AES_CCM_16_128_256:
if (!AES_CCM_Decrypt(pcose, 128, 16, pbKey, cbitKey / 8, cn->v.bytes, cn->length, pbAuthData, cbAuthData, perr)) goto error;
break;
#endif
#ifdef USE_AES_CCM_64_64_128
case COSE_Algorithm_AES_CCM_64_64_128:
if (!AES_CCM_Decrypt(pcose, 64, 64, pbKey, cbitKey / 8, cn->v.bytes, cn->length, pbAuthData, cbAuthData, perr)) goto error;
break;
#endif
#ifdef USE_AES_CCM_64_64_256
case COSE_Algorithm_AES_CCM_64_64_256:
if (!AES_CCM_Decrypt(pcose, 64, 64, pbKey, cbitKey / 8, cn->v.bytes, cn->length, pbAuthData, cbAuthData, perr)) goto error;
break;
#endif
#ifdef USE_AES_CCM_64_128_128
case COSE_Algorithm_AES_CCM_64_128_128:
if (!AES_CCM_Decrypt(pcose, 128, 64, pbKey, cbitKey / 8, cn->v.bytes, cn->length, pbAuthData, cbAuthData, perr)) goto error;
break;
#endif
#ifdef USE_AES_CCM_64_128_256
case COSE_Algorithm_AES_CCM_64_128_256:
if (!AES_CCM_Decrypt(pcose, 128, 64, pbKey, cbitKey / 8, cn->v.bytes, cn->length, pbAuthData, cbAuthData, perr)) goto error;
break;
#endif
#ifdef USE_AES_GCM_128
case COSE_Algorithm_AES_GCM_128:
if (!AES_GCM_Decrypt(pcose, pbKey, cbitKey / 8, cn->v.bytes, cn->length, pbAuthData, cbAuthData, perr)) goto error;
break;
#endif
#ifdef USE_AES_GCM_192
case COSE_Algorithm_AES_GCM_192:
if (!AES_GCM_Decrypt(pcose, pbKey, cbitKey / 8, cn->v.bytes, cn->length, pbAuthData, cbAuthData, perr)) goto error;
break;
#endif
#ifdef USE_AES_GCM_256
case COSE_Algorithm_AES_GCM_256:
if (!AES_GCM_Decrypt(pcose, pbKey, cbitKey / 8, cn->v.bytes, cn->length, pbAuthData, cbAuthData, perr)) goto error;
break;
#endif
default:
FAIL_CONDITION(COSE_ERR_UNKNOWN_ALGORITHM);
break;
}
if (pbAuthData != NULL) COSE_FREE(pbAuthData, context);
if ((pbKey != NULL) && (pbKeyIn == NULL)) COSE_FREE(pbKey, context);
if (perr != NULL) perr->err = COSE_ERR_NONE;
return true;
}
bool COSE_Enveloped_encrypt(HCOSE_ENVELOPED h, cose_errback * perr)
{
COSE_Enveloped * pcose = (COSE_Enveloped *)h;
CHECK_CONDITION(IsValidEnvelopedHandle(h), COSE_ERR_INVALID_HANDLE);
CHECK_CONDITION(pcose->m_recipientFirst != NULL, COSE_ERR_INVALID_HANDLE);
return _COSE_Enveloped_encrypt(pcose, NULL, 0, "Enveloped", perr);
errorReturn:
return false;
}
bool _COSE_Enveloped_encrypt(COSE_Enveloped * pcose, const byte * pbKeyIn, size_t cbKeyIn, const char * szContext, cose_errback * perr)
{
int alg;
int t;
COSE_RecipientInfo * pri;
const cn_cbor * cn_Alg = NULL;
byte * pbAuthData = NULL;
size_t cbitKey;
#ifdef USE_CBOR_CONTEXT
cn_cbor_context * context = &pcose->m_message.m_allocContext;
#endif
bool fRet = false;
byte * pbKey = NULL;
size_t cbKey = 0;
cn_Alg = _COSE_map_get_int(&pcose->m_message, COSE_Header_Algorithm, COSE_BOTH, perr);
if (cn_Alg == NULL) goto errorReturn;
CHECK_CONDITION((cn_Alg->type != CN_CBOR_TEXT), COSE_ERR_UNKNOWN_ALGORITHM);
CHECK_CONDITION((cn_Alg->type == CN_CBOR_UINT) || (cn_Alg->type == CN_CBOR_INT), COSE_ERR_INVALID_PARAMETER);
alg = (int) cn_Alg->v.uint;
// Get the key size
switch (alg) {
#ifdef USE_AES_CCM_64_64_128
case COSE_Algorithm_AES_CCM_64_64_128:
cbitKey = 128;
break;
#endif
#ifdef USE_AES_CCM_16_128_128
case COSE_Algorithm_AES_CCM_16_128_128:
cbitKey = 128;
break;
#endif
#ifdef USE_AES_CCM_64_128_128
case COSE_Algorithm_AES_CCM_64_128_128:
cbitKey = 128;
break;
#endif
#ifdef USE_AES_CCM_16_64_128
case COSE_Algorithm_AES_CCM_16_64_128:
cbitKey = 128;
break;
#endif
#ifdef USE_AES_CCM_64_64_256
case COSE_Algorithm_AES_CCM_64_64_256:
cbitKey = 256;
break;
#endif
#ifdef USE_AES_CCM_16_128_256
case COSE_Algorithm_AES_CCM_16_128_256:
cbitKey = 256;
break;
#endif
#ifdef USE_AES_CCM_64_128_256
case COSE_Algorithm_AES_CCM_64_128_256:
cbitKey = 256;
break;
#endif
#ifdef USE_AES_CCM_16_64_256
case COSE_Algorithm_AES_CCM_16_64_256:
cbitKey = 256;
break;
#endif
#ifdef USE_AES_GCM_128
case COSE_Algorithm_AES_GCM_128:
cbitKey = 128;
break;
#endif
#ifdef USE_AES_GCM_192
case COSE_Algorithm_AES_GCM_192:
cbitKey = 192;
break;
#endif
#ifdef USE_AES_GCM_256
case COSE_Algorithm_AES_GCM_256:
cbitKey = 256;
break;
#endif
default:
FAIL_CONDITION(COSE_ERR_UNKNOWN_ALGORITHM);
}
// Enveloped or Encrypted?
if (pbKeyIn != NULL) {
CHECK_CONDITION(cbKeyIn == cbitKey / 8, COSE_ERR_INVALID_PARAMETER);
pbKey = pbKeyIn;
cbKey = cbKeyIn;
}
else {
// If we are doing direct encryption - then recipient generates the key
t = 0;
for (pri = pcose->m_recipientFirst; pri != NULL; pri = pri->m_recipientNext) {
if (pri->m_encrypt.m_message.m_flags & 1) {
CHECK_CONDITION(pbKey == NULL, COSE_ERR_INVALID_PARAMETER);
t |= 1;
pbKey = _COSE_RecipientInfo_generateKey(pri, alg, cbitKey, perr);
cbKey = cbitKey / 8;
if (pbKey == NULL) goto errorReturn;
}
else {
t |= 2;
}
}
CHECK_CONDITION(t != 3, COSE_ERR_INVALID_PARAMETER);
if (t == 2) {
pbKey = (byte *)COSE_CALLOC(cbitKey / 8, 1, context);
CHECK_CONDITION(pbKey != NULL, COSE_ERR_OUT_OF_MEMORY);
cbKey = cbitKey / 8;
rand_bytes(pbKey, cbKey);
}
}
// Build protected headers
const cn_cbor * cbProtected = _COSE_encode_protected(&pcose->m_message, perr);
if (cbProtected == NULL) goto errorReturn;
// Build authenticated data
size_t cbAuthData = 0;
if (!_COSE_Encrypt_Build_AAD(&pcose->m_message, &pbAuthData, &cbAuthData, szContext, perr)) goto errorReturn;
switch (alg) {
#ifdef USE_AES_CCM_16_64_128
case COSE_Algorithm_AES_CCM_16_64_128:
if (!AES_CCM_Encrypt(pcose, 64, 16, pbKey, cbKey, pbAuthData, cbAuthData, perr)) goto errorReturn;
break;
#endif
#ifdef USE_AES_CCM_16_64_256
case COSE_Algorithm_AES_CCM_16_64_256:
if (!AES_CCM_Encrypt(pcose, 64, 16, pbKey, cbKey, pbAuthData, cbAuthData, perr)) goto errorReturn;
break;
#endif
#ifdef USE_AES_CCM_16_128_128
case COSE_Algorithm_AES_CCM_16_128_128:
if (!AES_CCM_Encrypt(pcose, 128, 16, pbKey, cbKey, pbAuthData, cbAuthData, perr)) goto errorReturn;
break;
#endif
#ifdef USE_AES_CCM_16_128_256
case COSE_Algorithm_AES_CCM_16_128_256:
if (!AES_CCM_Encrypt(pcose, 128, 16, pbKey, cbKey, pbAuthData, cbAuthData, perr)) goto errorReturn;
break;
#endif
#ifdef USE_AES_CCM_64_64_128
case COSE_Algorithm_AES_CCM_64_64_128:
if (!AES_CCM_Encrypt(pcose, 64, 64, pbKey, cbKey, pbAuthData, cbAuthData, perr)) goto errorReturn;
break;
#endif
#ifdef USE_AES_CCM_64_64_256
case COSE_Algorithm_AES_CCM_64_64_256:
if (!AES_CCM_Encrypt(pcose, 64, 64, pbKey, cbKey, pbAuthData, cbAuthData, perr)) goto errorReturn;
break;
#endif
#ifdef USE_AES_CCM_64_128_128
case COSE_Algorithm_AES_CCM_64_128_128:
if (!AES_CCM_Encrypt(pcose, 128, 64, pbKey, cbKey, pbAuthData, cbAuthData, perr)) goto errorReturn;
break;
#endif
#ifdef USE_AES_CCM_64_128_256
case COSE_Algorithm_AES_CCM_64_128_256:
if (!AES_CCM_Encrypt(pcose, 128, 64, pbKey, cbKey, pbAuthData, cbAuthData, perr)) goto errorReturn;
break;
#endif
#ifdef USE_AES_GCM_128
case COSE_Algorithm_AES_GCM_128:
if (!AES_GCM_Encrypt(pcose, pbKey, cbKey, pbAuthData, cbAuthData, perr)) goto errorReturn;
break;
#endif
#ifdef USE_AES_GCM_192
case COSE_Algorithm_AES_GCM_192:
if (!AES_GCM_Encrypt(pcose, pbKey, cbKey, pbAuthData, cbAuthData, perr)) goto errorReturn;
break;
#endif
#ifdef USE_AES_GCM_256
case COSE_Algorithm_AES_GCM_256:
if (!AES_GCM_Encrypt(pcose, pbKey, cbKey, pbAuthData, cbAuthData, perr)) goto errorReturn;
break;
#endif
default:
FAIL_CONDITION(COSE_ERR_UNKNOWN_ALGORITHM);
}
for (pri = pcose->m_recipientFirst; pri != NULL; pri = pri->m_recipientNext) {
if (!_COSE_Recipient_encrypt(pri, pbKey, cbKey, perr)) goto errorReturn;
}
// Figure out the clean up
fRet = true;
errorReturn:
if (pbAuthData != NULL) COSE_FREE(pbAuthData, context);
if ((pbKey != NULL) && (pbKey != pbKeyIn)) {
memset(pbKey, 0, cbKey);
COSE_FREE(pbKey, context);
}
return fRet;
}
bool COSE_Enveloped_SetContent(HCOSE_ENVELOPED h, const byte * rgb, size_t cb, cose_errback * perr)
{
CHECK_CONDITION(IsValidEnvelopedHandle(h), COSE_ERR_INVALID_HANDLE);
CHECK_CONDITION(rgb != NULL, COSE_ERR_INVALID_PARAMETER);
return _COSE_Enveloped_SetContent((COSE_Enveloped *)h, rgb, cb, perr);
errorReturn:
return false;
}
/*!
* @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_Enveloped_SetExternal(HCOSE_ENVELOPED hcose, const byte * pbExternalData, size_t cbExternalData, cose_errback * perr)
{
CHECK_CONDITION(IsValidEnvelopedHandle(hcose), COSE_ERR_INVALID_HANDLE)
CHECK_CONDITION((pbExternalData != NULL) || (cbExternalData == 0), COSE_ERR_INVALID_PARAMETER);
return _COSE_SetExternal(&((COSE_Enveloped *)hcose)->m_message, pbExternalData, cbExternalData, perr);
errorReturn:
return false;
}
bool _COSE_Enveloped_SetContent(COSE_Enveloped * cose, const byte * rgb, size_t cb, cose_errback * perror)
{
byte * pb;
cose->pbContent = pb = (byte *)COSE_CALLOC(cb, 1, &cose->m_message.m_allocContext);
if (cose->pbContent == NULL) {
if (perror != NULL) perror->err = COSE_ERR_INVALID_PARAMETER;
return false;
}
memcpy(pb, rgb, cb);
cose->cbContent = cb;
return true;
}
/*! brief Retrieve header parameter from an enveloped message structure
*
* Retrieve a header parameter from the message.
* Retrieved object is the same as the one in the message - do not delete it
*
* @param[in] h Handle of recipient object
* @param[in] key Key to look for
* @param[in] flags What buckets should we look for the message
* @param[out] perror Location to return error codes
* @return Object which is found or NULL
*/
cn_cbor * COSE_Enveloped_map_get_int(HCOSE_ENVELOPED h, int key, int flags, cose_errback * perror)
{
if (!IsValidEnvelopedHandle(h)) {
if (perror != NULL) perror->err = COSE_ERR_INVALID_HANDLE;
return NULL;
}
return _COSE_map_get_int(&((COSE_Enveloped *)h)->m_message, key, flags, perror);
}
bool COSE_Enveloped_map_put_int(HCOSE_ENVELOPED h, int key, cn_cbor * value, int flags, cose_errback * perr)
{
CHECK_CONDITION(IsValidEnvelopedHandle(h), COSE_ERR_INVALID_HANDLE);
CHECK_CONDITION(value != NULL, COSE_ERR_INVALID_PARAMETER);
return _COSE_map_put(&((COSE_Enveloped *)h)->m_message, key, value, flags, perr);
errorReturn:
return false;
}
bool COSE_Enveloped_AddRecipient(HCOSE_ENVELOPED hEnc, HCOSE_RECIPIENT hRecip, cose_errback * perr)
{
COSE_RecipientInfo * pRecip;
COSE_Enveloped * pEncrypt;
cn_cbor * pRecipients = NULL;
#ifdef USE_CBOR_CONTEXT
cn_cbor_context * context;
#endif
cn_cbor_errback cbor_error;
CHECK_CONDITION(IsValidEnvelopedHandle(hEnc), COSE_ERR_INVALID_HANDLE);
CHECK_CONDITION(IsValidRecipientHandle(hRecip), COSE_ERR_INVALID_HANDLE);
pEncrypt = (COSE_Enveloped *)hEnc;
pRecip = (COSE_RecipientInfo *)hRecip;
#ifdef USE_CBOR_CONTEXT
context = &pEncrypt->m_message.m_allocContext;
#endif // USE_CBOR_CONTEXT
pRecip->m_recipientNext = pEncrypt->m_recipientFirst;
pEncrypt->m_recipientFirst = pRecip;
pRecipients = _COSE_arrayget_int(&pEncrypt->m_message, INDEX_RECIPIENTS);
if (pRecipients == NULL) {
pRecipients = cn_cbor_array_create(CBOR_CONTEXT_PARAM_COMMA &cbor_error);
CHECK_CONDITION_CBOR(pRecipients != NULL, cbor_error);
if (!_COSE_array_replace(&pEncrypt->m_message, pRecipients, INDEX_RECIPIENTS, CBOR_CONTEXT_PARAM_COMMA &cbor_error)) {
CN_CBOR_FREE(pRecipients, context);
if (perr != NULL) perr->err = _MapFromCBOR(cbor_error);
goto errorReturn;
}
}
CHECK_CONDITION_CBOR(cn_cbor_array_append(pRecipients, pRecip->m_encrypt.m_message.m_cbor, &cbor_error), cbor_error);
pRecip->m_encrypt.m_message.m_refCount++;
return true;
errorReturn:
return false;
}
bool _COSE_Encrypt_Build_AAD(COSE * pMessage, byte ** ppbAAD, size_t * pcbAAD, const char * szContext, cose_errback * perr)
{
#ifdef USE_CBOR_CONTEXT
cn_cbor_context * context = &pMessage->m_allocContext;
#endif
cn_cbor_errback cbor_error;
byte * pbAuthData;
size_t cbAuthData;
cn_cbor * pAuthData;
cn_cbor * pItem;
cn_cbor * ptmp = NULL;
// Build authenticated data
pbAuthData = NULL;
pAuthData = cn_cbor_array_create(CBOR_CONTEXT_PARAM_COMMA &cbor_error);
CHECK_CONDITION_CBOR(pAuthData != NULL, cbor_error);
ptmp = cn_cbor_string_create(szContext, CBOR_CONTEXT_PARAM_COMMA &cbor_error);
CHECK_CONDITION_CBOR(ptmp != NULL, cbor_error);
CHECK_CONDITION_CBOR(cn_cbor_array_append(pAuthData, ptmp, &cbor_error), cbor_error);
ptmp = NULL;
pItem = _COSE_arrayget_int(pMessage, INDEX_PROTECTED);
CHECK_CONDITION(pItem != NULL, COSE_ERR_INVALID_PARAMETER);
if ((pItem->length == 1) && (pItem->v.bytes[0] == 0xa0)) {
ptmp = cn_cbor_data_create(NULL, 0, CBOR_CONTEXT_PARAM_COMMA &cbor_error);
}
else {
ptmp = cn_cbor_data_create(pItem->v.bytes, (int)pItem->length, CBOR_CONTEXT_PARAM_COMMA &cbor_error);
}
CHECK_CONDITION_CBOR(ptmp != NULL, cbor_error);
CHECK_CONDITION_CBOR(cn_cbor_array_append(pAuthData, ptmp, &cbor_error), cbor_error);
ptmp = NULL;
ptmp = cn_cbor_data_create(pMessage->m_pbExternal, (int) pMessage->m_cbExternal, CBOR_CONTEXT_PARAM_COMMA &cbor_error);
CHECK_CONDITION_CBOR(ptmp != NULL, cbor_error);
CHECK_CONDITION_CBOR(cn_cbor_array_append(pAuthData, ptmp, &cbor_error), cbor_error);
ptmp = NULL;
cbAuthData = cn_cbor_encoder_write(RgbDontUse, 0, sizeof(RgbDontUse), pAuthData);
pbAuthData = (byte *)COSE_CALLOC(cbAuthData, 1, context);
CHECK_CONDITION(pbAuthData != NULL, COSE_ERR_OUT_OF_MEMORY);
CHECK_CONDITION((size_t)cn_cbor_encoder_write(pbAuthData, 0, cbAuthData, pAuthData) == cbAuthData, COSE_ERR_CBOR);
*ppbAAD = pbAuthData;
*pcbAAD = cbAuthData;
return true;
errorReturn:
if (pbAuthData != NULL) COSE_FREE(pbAuthData, context);
if (ptmp != NULL) CN_CBOR_FREE(ptmp, NULL);
if (pAuthData != NULL) CN_CBOR_FREE(pAuthData, context);
return false;
}
HCOSE_RECIPIENT COSE_Enveloped_GetRecipient(HCOSE_ENVELOPED cose, int iRecipient, cose_errback * perr)
{
int i;
COSE_RecipientInfo * p = NULL;
CHECK_CONDITION(IsValidEnvelopedHandle(cose), COSE_ERR_INVALID_HANDLE);
CHECK_CONDITION(iRecipient >= 0, COSE_ERR_INVALID_PARAMETER);
p = ((COSE_Enveloped *)cose)->m_recipientFirst;
for (i = 0; i < iRecipient; i++) {
CHECK_CONDITION(p != NULL, COSE_ERR_INVALID_PARAMETER);
p = p->m_recipientNext;
}
if (p != NULL) p->m_encrypt.m_message.m_refCount++;
errorReturn:
return (HCOSE_RECIPIENT)p;
}