blob: 6585bcf8ba57aaeed60b36fe99cec33f4efc90db [file] [log] [blame]
/** \file Encrypt0.c
* Contains implementation of the functions related to HCOSE_ENCRYPT 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"
byte RgbDontUse[8 * 1024]; // Remove this array when we can compute the size of a cbor serialization without this hack.
void _COSE_Encrypt_Release(COSE_Encrypt * p);
COSE * EncryptRoot = NULL;
bool IsValidEncryptHandle(HCOSE_ENCRYPT h)
{
COSE_Encrypt * p = (COSE_Encrypt *)h;
return _COSE_IsInList(EncryptRoot, (COSE *)p);
}
HCOSE_ENCRYPT COSE_Encrypt_Init(CBOR_CONTEXT_COMMA cose_errback * perror)
{
COSE_Encrypt * pobj = (COSE_Encrypt *)COSE_CALLOC(1, sizeof(COSE_Encrypt), context);
if (pobj == NULL) {
if (perror != NULL) perror->err = COSE_ERR_OUT_OF_MEMORY;
return NULL;
}
if (!_COSE_Init(&pobj->m_message, COSE_enveloped_object, CBOR_CONTEXT_PARAM_COMMA perror)) {
_COSE_Encrypt_Release(pobj);
COSE_FREE(pobj, context);
return NULL;
}
_COSE_InsertInList(&EncryptRoot, &pobj->m_message);
return (HCOSE_ENCRYPT) pobj;
}
HCOSE_ENCRYPT _COSE_Encrypt_Init_From_Object(cn_cbor * cbor, COSE_Encrypt * pIn, CBOR_CONTEXT_COMMA cose_errback * perr)
{
COSE_Encrypt * pobj = pIn;
cn_cbor * pRecipients = NULL;
cose_errback error = { 0 };
if (perr == NULL) perr = &error;
if (pobj == NULL) pobj = (COSE_Encrypt *)COSE_CALLOC(1, sizeof(COSE_Encrypt), context);
if (pobj == NULL) {
perr->err = COSE_ERR_OUT_OF_MEMORY;
errorReturn:
if (pobj != NULL) {
_COSE_Encrypt_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);
CHECK_CONDITION(pRecipients == NULL, COSE_ERR_INVALID_PARAMETER);
_COSE_InsertInList(&EncryptRoot, &pobj->m_message);
return(HCOSE_ENCRYPT) pobj;
}
bool COSE_Encrypt_Free(HCOSE_ENCRYPT h)
{
#ifdef USE_CBOR_CONTEXT
cn_cbor_context context;
#endif
COSE_Encrypt * pEncrypt = (COSE_Encrypt *)h;
if (!IsValidEncryptHandle(h)) return false;
#ifdef USE_CBOR_CONTEXT
context = ((COSE_Encrypt *)h)->m_message.m_allocContext;
#endif
_COSE_Encrypt_Release(pEncrypt);
_COSE_RemoveFromList(&EncryptRoot, &pEncrypt->m_message);
COSE_FREE((COSE_Encrypt *)h, &context);
return true;
}
void _COSE_Encrypt_Release(COSE_Encrypt * p)
{
if (p->pbContent != NULL) COSE_FREE((void *) p->pbContent, &p->m_message.m_allocContext);
_COSE_Release(&p->m_message);
}
bool COSE_Encrypt_decrypt(HCOSE_ENCRYPT h, const byte * pbKey, size_t cbKey, cose_errback * perr)
{
COSE_Encrypt * pcose = (COSE_Encrypt *)h;
cose_errback error = { 0 };
bool f;
if (!IsValidEncryptHandle(h)) {
if (perr != NULL) perr->err = COSE_ERR_INVALID_PARAMETER;
return false;
}
f = _COSE_Encrypt_decrypt(pcose, pbKey, cbKey, &error);
if (perr != NULL) *perr = error;
return f;
}
bool _COSE_Encrypt_decrypt(COSE_Encrypt * pcose, const byte * pbKey, size_t cbKey, cose_errback * perr)
{
int alg;
const cn_cbor * cn = NULL;
size_t cbitKey;
#ifdef USE_CBOR_CONTEXT
cn_cbor_context * context;
#endif
byte * pbAuthData = NULL;
size_t cbAuthData;
byte * pbProtected = NULL;
ssize_t cbProtected;
#ifdef USE_CBOR_CONTEXT
context = &pcose->m_message.m_allocContext;
#endif
cn = _COSE_map_get_int(&pcose->m_message, COSE_Header_Algorithm, COSE_BOTH, perr);
if (cn == NULL) {
error:
errorReturn:
if (pbProtected != NULL) COSE_FREE(pbProtected, context);
if (pbAuthData != NULL) COSE_FREE(pbAuthData, 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 INCLUDE_AES_CCM
case COSE_Algorithm_AES_CCM_16_64_128:
case COSE_Algorithm_AES_CCM_16_128_128:
case COSE_Algorithm_AES_CCM_64_64_128:
case COSE_Algorithm_AES_CCM_64_128_128:
cbitKey = 128;
break;
case COSE_Algorithm_AES_CCM_64_64_256:
case COSE_Algorithm_AES_CCM_16_128_256:
case COSE_Algorithm_AES_CCM_64_128_256:
case COSE_Algorithm_AES_CCM_16_64_256:
cbitKey = 256;
break;
#endif // INCLUDE_AES_CCM
case COSE_Algorithm_AES_GCM_128:
cbitKey = 128;
break;
case COSE_Algorithm_AES_GCM_192:
cbitKey = 192;
break;
case COSE_Algorithm_AES_GCM_256:
cbitKey = 256;
break;
default:
FAIL_CONDITION(COSE_ERR_UNKNOWN_ALGORITHM);
break;
}
CHECK_CONDITION(cbitKey / 8 == cbKey, COSE_ERR_INVALID_PARAMETER);
// Build protected headers
CHECK_CONDITION(pcose->m_message.m_protectedMap != NULL, COSE_ERR_INVALID_PARAMETER);
if ((pcose->m_message.m_protectedMap != NULL) && (pcose->m_message.m_protectedMap->first_child != NULL)) {
cbProtected = cn_cbor_encoder_write(RgbDontUse, 0, sizeof(RgbDontUse), pcose->m_message.m_protectedMap);
pbProtected = (byte *)COSE_CALLOC(cbProtected, 1, context);
if (pbProtected == NULL) goto error;
if (cn_cbor_encoder_write(pbProtected, 0, cbProtected, pcose->m_message.m_protectedMap) != cbProtected) goto error;
}
else {
pbProtected = NULL;
cbProtected = 0;
}
// Build authenticated data
if (!_COSE_Encrypt_Build_AAD(&pcose->m_message, &pbAuthData, &cbAuthData, "Encrypted", perr)) goto errorReturn;
cn = _COSE_arrayget_int(&pcose->m_message, INDEX_BODY);
CHECK_CONDITION(cn != NULL, COSE_ERR_INVALID_PARAMETER);
switch (alg) {
#ifdef INCLUDE_AES_CCM
case COSE_Algorithm_AES_CCM_16_64_128:
case COSE_Algorithm_AES_CCM_16_64_256:
if (!AES_CCM_Decrypt((COSE_Enveloped *)pcose, 64, 16, pbKey, cbitKey / 8, cn->v.bytes, cn->length, pbAuthData, cbAuthData, perr)) goto error;
break;
case COSE_Algorithm_AES_CCM_16_128_128:
case COSE_Algorithm_AES_CCM_16_128_256:
if (!AES_CCM_Decrypt((COSE_Enveloped *)pcose, 128, 16, pbKey, cbitKey / 8, cn->v.bytes, cn->length, pbAuthData, cbAuthData, perr)) goto error;
break;
case COSE_Algorithm_AES_CCM_64_64_128:
case COSE_Algorithm_AES_CCM_64_64_256:
if (!AES_CCM_Decrypt((COSE_Enveloped *)pcose, 64, 64, pbKey, cbitKey / 8, cn->v.bytes, cn->length, pbAuthData, cbAuthData, perr)) goto error;
break;
case COSE_Algorithm_AES_CCM_64_128_128:
case COSE_Algorithm_AES_CCM_64_128_256:
if (!AES_CCM_Decrypt((COSE_Enveloped *)pcose, 128, 64, pbKey, cbitKey / 8, cn->v.bytes, cn->length, pbAuthData, cbAuthData, perr)) goto error;
break;
#endif // INCLUDE_AES_CCM
case COSE_Algorithm_AES_GCM_128:
case COSE_Algorithm_AES_GCM_192:
case COSE_Algorithm_AES_GCM_256:
if (!AES_GCM_Decrypt((COSE_Enveloped *)pcose, pbKey, cbitKey / 8, cn->v.bytes, cn->length, pbAuthData, cbAuthData, perr)) goto error;
break;
default:
FAIL_CONDITION(COSE_ERR_UNKNOWN_ALGORITHM);
break;
}
if (pbProtected != NULL) COSE_FREE(pbProtected, context);
if (pbAuthData != NULL) COSE_FREE(pbAuthData, context);
if (perr != NULL) perr->err = COSE_ERR_NONE;
return true;
}
bool COSE_Encrypt_encrypt(HCOSE_ENCRYPT h, const byte * pbKey, size_t cbKey, cose_errback * perr)
{
int alg;
const cn_cbor * cn_Alg = NULL;
byte * pbAuthData = NULL;
size_t cbitKey;
#ifdef USE_CBOR_CONTEXT
cn_cbor_context * context = NULL;
#endif
COSE_Encrypt * pcose = (COSE_Encrypt *) h;
bool fRet = false;
CHECK_CONDITION(IsValidEncryptHandle(h), COSE_ERR_INVALID_PARAMETER);
#ifdef USE_CBOR_CONTEXT
context = &pcose->m_message.m_allocContext;
#endif // USE_CBOR_CONTEXT
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_UINT) || (cn_Alg->type == CN_CBOR_INT), COSE_ERR_INVALID_PARAMETER);
alg = (int) cn_Alg->v.uint;
// Get the key size
switch (alg) {
#ifdef INCLUDE_AES_CCM
case COSE_Algorithm_AES_CCM_64_64_128:
case COSE_Algorithm_AES_CCM_16_128_128:
case COSE_Algorithm_AES_CCM_64_128_128:
case COSE_Algorithm_AES_CCM_16_64_128:
cbitKey = 128;
break;
case COSE_Algorithm_AES_CCM_64_64_256:
case COSE_Algorithm_AES_CCM_16_128_256:
case COSE_Algorithm_AES_CCM_64_128_256:
case COSE_Algorithm_AES_CCM_16_64_256:
cbitKey = 256;
break;
#endif // INCLUDE_AES_CCM
case COSE_Algorithm_AES_GCM_128: cbitKey = 128; break;
case COSE_Algorithm_AES_GCM_192: cbitKey = 192; break;
case COSE_Algorithm_AES_GCM_256: cbitKey = 256; break;
default:
FAIL_CONDITION(COSE_ERR_INVALID_PARAMETER);
}
// 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, "Encrypted", perr)) goto errorReturn;
switch (alg) {
#ifdef INCLUDE_AES_CCM
case COSE_Algorithm_AES_CCM_16_64_128:
case COSE_Algorithm_AES_CCM_16_64_256:
if (!AES_CCM_Encrypt((COSE_Enveloped *)pcose, 64, 16, pbKey, cbKey, pbAuthData, cbAuthData, perr)) goto errorReturn;
break;
case COSE_Algorithm_AES_CCM_16_128_128:
case COSE_Algorithm_AES_CCM_16_128_256:
if (!AES_CCM_Encrypt((COSE_Enveloped *)pcose, 128, 16, pbKey, cbKey, pbAuthData, cbAuthData, perr)) goto errorReturn;
break;
case COSE_Algorithm_AES_CCM_64_64_128:
case COSE_Algorithm_AES_CCM_64_64_256:
if (!AES_CCM_Encrypt((COSE_Enveloped *)pcose, 64, 64, pbKey, cbKey, pbAuthData, cbAuthData, perr)) goto errorReturn;
break;
case COSE_Algorithm_AES_CCM_64_128_128:
case COSE_Algorithm_AES_CCM_64_128_256:
if (!AES_CCM_Encrypt((COSE_Enveloped *)pcose, 128, 64, pbKey, cbKey, pbAuthData, cbAuthData, perr)) goto errorReturn;
break;
#endif
case COSE_Algorithm_AES_GCM_128:
case COSE_Algorithm_AES_GCM_192:
case COSE_Algorithm_AES_GCM_256:
if (!AES_GCM_Encrypt((COSE_Enveloped *)pcose, pbKey, cbKey, pbAuthData, cbAuthData, perr)) goto errorReturn;
break;
default:
FAIL_CONDITION(COSE_ERR_INVALID_PARAMETER);
}
// Figure out the clean up
fRet = true;
errorReturn:
if (pbAuthData != NULL) COSE_FREE(pbAuthData, context);
return fRet;
}
bool COSE_Encrypt_SetContent(HCOSE_ENCRYPT h, const byte * rgb, size_t cb, cose_errback * perror)
{
if (!IsValidEncryptHandle(h) || (rgb == NULL)) {
if (perror != NULL) perror->err = COSE_ERR_INVALID_PARAMETER;
return false;
}
return _COSE_Encrypt_SetContent((COSE_Encrypt *)h, rgb, cb, perror);
}
bool _COSE_Encrypt_SetContent(COSE_Encrypt * 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 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_Encrypt_SetExternal(HCOSE_ENCRYPT hcose, const byte * pbExternalData, size_t cbExternalData, cose_errback * perr)
{
if (!IsValidEncryptHandle(hcose)) {
if (perr != NULL) perr->err = COSE_ERR_INVALID_PARAMETER;
return false;
}
return _COSE_SetExternal(&((COSE_Encrypt *)hcose)->m_message, pbExternalData, cbExternalData, perr);
}
cn_cbor * COSE_Encrypt_map_get_int(HCOSE_ENCRYPT h, int key, int flags, cose_errback * perror)
{
if (!IsValidEncryptHandle(h)) {
if (perror != NULL) perror->err = COSE_ERR_INVALID_PARAMETER;
return NULL;
}
return _COSE_map_get_int(&((COSE_Encrypt *)h)->m_message, key, flags, perror);
}
bool COSE_Encrypt_map_put_int(HCOSE_ENCRYPT h, int key, cn_cbor * value, int flags, cose_errback * perror)
{
if (!IsValidEncryptHandle(h) || (value == NULL)) {
if (perror != NULL) perror->err = COSE_ERR_INVALID_PARAMETER;
return false;
}
return _COSE_map_put(&((COSE_Encrypt *)h)->m_message, key, value, flags, perror);
}