| /** \file MacMessage.c |
| * Contains implementation of the functions related to HCOSE_MAC handle objects. |
| */ |
| |
| #include <stdlib.h> |
| #ifndef __MBED__ |
| #include <memory.h> |
| #endif |
| #include <stdio.h> |
| #include <assert.h> |
| #include <string.h> |
| |
| #include "cose.h" |
| #include "cose_int.h" |
| #include "configure.h" |
| #include "crypto.h" |
| |
| #if INCLUDE_MAC |
| |
| COSE * MacRoot = NULL; |
| |
| /*! \private |
| * @brief Test if a HCOSE_MAC handle is valid |
| * |
| * Internal function to test if a MAC 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 IsValidMacHandle(HCOSE_MAC h) |
| { |
| COSE_MacMessage * p = (COSE_MacMessage *)h; |
| return _COSE_IsInList(MacRoot, (COSE *) p); |
| } |
| |
| |
| HCOSE_MAC COSE_Mac_Init(COSE_INIT_FLAGS flags, CBOR_CONTEXT_COMMA cose_errback * perr) |
| { |
| COSE_MacMessage * pobj = NULL; |
| |
| CHECK_CONDITION(flags == COSE_INIT_FLAGS_NONE, COSE_ERR_INVALID_PARAMETER); |
| |
| pobj = (COSE_MacMessage *)COSE_CALLOC(1, sizeof(COSE_MacMessage), context); |
| CHECK_CONDITION(pobj != NULL, COSE_ERR_OUT_OF_MEMORY); |
| |
| if (!_COSE_Init(flags, &pobj->m_message, COSE_mac_object, CBOR_CONTEXT_PARAM_COMMA perr)) { |
| goto errorReturn; |
| } |
| |
| _COSE_InsertInList(&MacRoot, &pobj->m_message); |
| |
| return (HCOSE_MAC)pobj; |
| |
| errorReturn: |
| if (pobj != NULL) { |
| _COSE_Mac_Release(pobj); |
| COSE_FREE(pobj, context); |
| } |
| return NULL; |
| } |
| |
| HCOSE_MAC _COSE_Mac_Init_From_Object(cn_cbor * cbor, COSE_MacMessage * pIn, CBOR_CONTEXT_COMMA cose_errback * perr) |
| { |
| COSE_MacMessage * pobj = pIn; |
| cn_cbor * pRecipients = NULL; |
| // cn_cbor * tmp; |
| cose_errback error = { COSE_ERR_NONE }; |
| if (perr == NULL) perr = &error; |
| |
| if (pobj == NULL) pobj = (COSE_MacMessage *)COSE_CALLOC(1, sizeof(COSE_MacMessage), context); |
| if (pobj == NULL) { |
| perr->err = COSE_ERR_OUT_OF_MEMORY; |
| errorReturn: |
| if (pobj != NULL) { |
| _COSE_Mac_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_MAC_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); |
| if (pInfo == NULL) goto errorReturn; |
| |
| pInfo->m_recipientNext = pobj->m_recipientFirst; |
| pobj->m_recipientFirst = pInfo; |
| pRecipients = pRecipients->next; |
| } |
| } |
| |
| _COSE_InsertInList(&MacRoot, &pobj->m_message); |
| |
| return(HCOSE_MAC)pobj; |
| } |
| |
| bool COSE_Mac_Free(HCOSE_MAC h) |
| { |
| #ifdef USE_CBOR_CONTEXT |
| cn_cbor_context context; |
| #endif |
| COSE_MacMessage * p = (COSE_MacMessage *)h; |
| |
| if (!IsValidMacHandle(h)) return false; |
| |
| if (p->m_message.m_refCount > 1) { |
| p->m_message.m_refCount--; |
| return true; |
| } |
| |
| _COSE_RemoveFromList(&MacRoot, &p->m_message); |
| |
| #ifdef USE_CBOR_CONTEXT |
| context = ((COSE_MacMessage *)h)->m_message.m_allocContext; |
| #endif |
| |
| _COSE_Mac_Release((COSE_MacMessage *)h); |
| |
| COSE_FREE((COSE_MacMessage *)h, &context); |
| |
| return true; |
| } |
| |
| bool _COSE_Mac_Release(COSE_MacMessage * p) |
| { |
| COSE_RecipientInfo * pRecipient; |
| COSE_RecipientInfo * pRecipient2; |
| |
| for (pRecipient = p->m_recipientFirst; pRecipient != NULL; pRecipient = pRecipient2) { |
| pRecipient2 = pRecipient->m_recipientNext; |
| _COSE_Recipient_Free(pRecipient); |
| } |
| |
| _COSE_Release(&p->m_message); |
| |
| return true; |
| } |
| |
| |
| bool COSE_Mac_SetContent(HCOSE_MAC cose, const byte * rgbContent, size_t cbContent, cose_errback * perr) |
| { |
| COSE_MacMessage * p = (COSE_MacMessage *)cose; |
| #ifdef USE_CBOR_CONTEXT |
| cn_cbor_context * context = &p->m_message.m_allocContext; |
| #endif |
| cn_cbor * ptmp = NULL; |
| cn_cbor_errback cbor_error; |
| |
| CHECK_CONDITION(IsValidMacHandle(cose), COSE_ERR_INVALID_PARAMETER); |
| |
| ptmp = cn_cbor_data_create(rgbContent, (int) cbContent, CBOR_CONTEXT_PARAM_COMMA &cbor_error); |
| CHECK_CONDITION_CBOR(ptmp != NULL, cbor_error); |
| |
| CHECK_CONDITION_CBOR(_COSE_array_replace(&p->m_message, ptmp, INDEX_BODY, CBOR_CONTEXT_PARAM_COMMA &cbor_error), cbor_error); |
| ptmp = NULL; |
| |
| return true; |
| |
| errorReturn: |
| if (ptmp != NULL) CN_CBOR_FREE(ptmp, context); |
| return false; |
| } |
| |
| /*! |
| * @brief Set the application external data for authentication |
| * |
| * MAC 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 MAC 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_Mac_SetExternal(HCOSE_MAC hcose, const byte * pbExternalData, size_t cbExternalData, cose_errback * perr) |
| { |
| if (!IsValidMacHandle(hcose)) { |
| if (perr != NULL) perr->err = COSE_ERR_INVALID_PARAMETER; |
| return false; |
| } |
| |
| return _COSE_SetExternal(&((COSE_MacMessage *)hcose)->m_message, pbExternalData, cbExternalData, perr); |
| } |
| |
| |
| cn_cbor * COSE_Mac_map_get_int(HCOSE_MAC h, int key, int flags, cose_errback * perror) |
| { |
| if (!IsValidMacHandle(h)) { |
| if (perror != NULL) perror->err = COSE_ERR_INVALID_PARAMETER; |
| return NULL; |
| } |
| |
| return _COSE_map_get_int(&((COSE_MacMessage *)h)->m_message, key, flags, perror); |
| } |
| |
| |
| bool COSE_Mac_map_put_int(HCOSE_MAC h, int key, cn_cbor * value, int flags, cose_errback * perror) |
| { |
| if (!IsValidMacHandle(h) || (value == NULL)) { |
| if (perror != NULL) perror->err = COSE_ERR_INVALID_PARAMETER; |
| return false; |
| } |
| |
| return _COSE_map_put(&((COSE_MacMessage *)h)->m_message, key, value, flags, perror); |
| } |
| #endif |
| |
| #if INCLUDE_MAC || INCLUDE_MAC0 |
| bool _COSE_Mac_Build_AAD(COSE * pCose, const char * szContext, byte ** ppbAuthData, size_t * pcbAuthData, CBOR_CONTEXT_COMMA cose_errback * perr) |
| { |
| cn_cbor * pAuthData = NULL; |
| bool fRet = false; |
| cn_cbor_errback cbor_error; |
| cn_cbor * ptmp = NULL; |
| cn_cbor * pcn; |
| size_t cbAuthData; |
| byte * pbAuthData = NULL; |
| |
| // Build authenticated data |
| // Protected headers |
| // external data |
| // body |
| |
| pAuthData = cn_cbor_array_create(CBOR_CONTEXT_PARAM_COMMA NULL); |
| CHECK_CONDITION(pAuthData != NULL, COSE_ERR_OUT_OF_MEMORY); |
| |
| // Add the context string |
| |
| 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; |
| |
| // Add the protected attributes |
| |
| pcn = _COSE_arrayget_int(pCose, INDEX_PROTECTED); |
| CHECK_CONDITION((pcn != NULL) && (pcn->type == CN_CBOR_BYTES), COSE_ERR_INVALID_PARAMETER); |
| |
| if ((pcn->length == 1) && (pcn->v.bytes[0] == 0xa0)) { |
| ptmp = cn_cbor_data_create(NULL, 0, CBOR_CONTEXT_PARAM_COMMA NULL); |
| } |
| else { |
| ptmp = cn_cbor_data_create(pcn->v.bytes, (int)pcn->length, CBOR_CONTEXT_PARAM_COMMA NULL); |
| } |
| CHECK_CONDITION(ptmp != NULL, COSE_ERR_CBOR); |
| |
| CHECK_CONDITION(cn_cbor_array_append(pAuthData, ptmp, NULL), COSE_ERR_CBOR); |
| ptmp = NULL; |
| |
| // Add the external bytes |
| |
| ptmp = cn_cbor_data_create(pCose->m_pbExternal, (int) pCose->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; |
| |
| // Add the content |
| pcn = _COSE_arrayget_int(pCose, INDEX_BODY); |
| ptmp = cn_cbor_data_create(pcn->v.bytes, (int)pcn->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; |
| |
| // Turn it into bytes |
| cbAuthData = cn_cbor_encode_size(pAuthData); |
| CHECK_CONDITION(cbAuthData > 0, COSE_ERR_CBOR); |
| pbAuthData = (byte *)COSE_CALLOC(cbAuthData, 1, context); |
| CHECK_CONDITION(pbAuthData != NULL, COSE_ERR_OUT_OF_MEMORY); |
| CHECK_CONDITION(cn_cbor_encoder_write(pbAuthData, 0, cbAuthData, pAuthData) == cbAuthData, COSE_ERR_CBOR); |
| |
| *ppbAuthData = pbAuthData; |
| *pcbAuthData = cbAuthData; |
| pbAuthData = NULL; |
| fRet = true; |
| |
| errorReturn: |
| if (pbAuthData != NULL) COSE_FREE(pbAuthData, context); |
| if (pAuthData != NULL) CN_CBOR_FREE(pAuthData, context); |
| if (ptmp != NULL) CN_CBOR_FREE(ptmp, context); |
| return fRet; |
| } |
| #endif |
| |
| #if INCLUDE_MAC |
| bool COSE_Mac_encrypt(HCOSE_MAC h, cose_errback * perr) |
| { |
| COSE_MacMessage * pcose = (COSE_MacMessage *)h; |
| |
| CHECK_CONDITION(IsValidMacHandle(h), COSE_ERR_INVALID_HANDLE); |
| CHECK_CONDITION(pcose->m_recipientFirst != NULL, COSE_ERR_INVALID_PARAMETER); |
| |
| return _COSE_Mac_compute(pcose, NULL, 0, "MAC", perr); |
| |
| errorReturn: |
| return false; |
| } |
| #endif |
| |
| #if INCLUDE_MAC || INCLUDE_MAC0 |
| bool _COSE_Mac_compute(COSE_MacMessage * 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; |
| size_t cbAuthData = 0; |
| const byte * pbKey = NULL; |
| byte * pbKeyNew = 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_CBC_MAC_128_64 |
| case COSE_Algorithm_CBC_MAC_128_64: |
| cbitKey = 128; |
| break; |
| #endif |
| |
| #ifdef USE_AES_CBC_MAC_128_128 |
| case COSE_Algorithm_CBC_MAC_128_128: |
| cbitKey = 128; |
| break; |
| #endif |
| |
| #ifdef USE_AES_CBC_MAC_256_64 |
| case COSE_Algorithm_CBC_MAC_256_64: |
| cbitKey = 256; |
| break; |
| #endif |
| |
| #ifdef USE_AES_CBC_MAC_256_128 |
| case COSE_Algorithm_CBC_MAC_256_128: |
| cbitKey = 256; |
| break; |
| #endif |
| |
| #ifdef USE_HMAC_256_64 |
| case COSE_Algorithm_HMAC_256_64: |
| cbitKey = 256; |
| break; |
| #endif |
| |
| #ifdef USE_HMAC_256_256 |
| case COSE_Algorithm_HMAC_256_256: |
| cbitKey = 256; |
| break; |
| #endif |
| |
| #ifdef USE_HMAC_384_384 |
| case COSE_Algorithm_HMAC_384_384: |
| cbitKey = 384; |
| break; |
| #endif |
| |
| #ifdef USE_HMAC_512_512 |
| case COSE_Algorithm_HMAC_512_512: |
| cbitKey = 512; |
| break; |
| #endif |
| |
| default: |
| FAIL_CONDITION(COSE_ERR_UNKNOWN_ALGORITHM); |
| } |
| |
| // If we are doing direct encryption - then recipient generates the key |
| |
| if (pbKeyIn != NULL) { |
| CHECK_CONDITION(cbKeyIn == cbitKey / 8, COSE_ERR_INVALID_PARAMETER); |
| pbKey = pbKeyIn; |
| cbKey = cbKeyIn; |
| } |
| else { |
| 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; |
| pbKeyNew = _COSE_RecipientInfo_generateKey(pri, alg, cbitKey, perr); |
| cbKey = cbitKey / 8; |
| CHECK_CONDITION(pbKeyNew != NULL, COSE_ERR_OUT_OF_MEMORY); |
| pbKey = pbKeyNew; |
| } |
| else { |
| t |= 2; |
| } |
| } |
| CHECK_CONDITION(t != 3, COSE_ERR_INVALID_PARAMETER); |
| |
| if (t == 2) { |
| pbKeyNew = (byte *)COSE_CALLOC(cbitKey / 8, 1, context); |
| CHECK_CONDITION(pbKeyNew != NULL, COSE_ERR_OUT_OF_MEMORY); |
| pbKey = pbKeyNew; |
| cbKey = cbitKey / 8; |
| rand_bytes(pbKeyNew, cbKey); |
| } |
| } |
| |
| // Build protected headers |
| |
| const cn_cbor * cbProtected = _COSE_encode_protected(&pcose->m_message, perr); |
| if (cbProtected == NULL) goto errorReturn; |
| |
| // Build authenticated data |
| |
| if (!_COSE_Mac_Build_AAD(&pcose->m_message, szContext, &pbAuthData, &cbAuthData, CBOR_CONTEXT_PARAM_COMMA perr)) goto errorReturn; |
| |
| switch (alg) { |
| #ifdef USE_AES_CBC_MAC_128_64 |
| case COSE_Algorithm_CBC_MAC_128_64: |
| if (!AES_CBC_MAC_Create(pcose, 64, pbKey, cbKey, pbAuthData, cbAuthData, perr)) goto errorReturn; |
| break; |
| #endif |
| |
| #ifdef USE_AES_CBC_MAC_256_64 |
| case COSE_Algorithm_CBC_MAC_256_64: |
| if (!AES_CBC_MAC_Create(pcose, 64, pbKey, cbKey, pbAuthData, cbAuthData, perr)) goto errorReturn; |
| break; |
| #endif |
| |
| #ifdef USE_AES_CBC_MAC_128_128 |
| case COSE_Algorithm_CBC_MAC_128_128: |
| if (!AES_CBC_MAC_Create(pcose, 128, pbKey, cbKey, pbAuthData, cbAuthData, perr)) goto errorReturn; |
| break; |
| #endif |
| |
| #ifdef USE_AES_CBC_MAC_256_128 |
| case COSE_Algorithm_CBC_MAC_256_128: |
| if (!AES_CBC_MAC_Create(pcose, 128, pbKey, cbKey, pbAuthData, cbAuthData, perr)) goto errorReturn; |
| break; |
| #endif |
| |
| #ifdef USE_HMAC_256_64 |
| case COSE_Algorithm_HMAC_256_64: |
| if (!HMAC_Create(pcose, 256, 64, pbKey, cbKey, pbAuthData, cbAuthData, perr)) goto errorReturn; |
| break; |
| #endif |
| |
| #ifdef USE_HMAC_256_256 |
| case COSE_Algorithm_HMAC_256_256: |
| if (!HMAC_Create(pcose, 256, 256, pbKey, cbKey, pbAuthData, cbAuthData, perr)) goto errorReturn; |
| break; |
| #endif |
| |
| #ifdef USE_HMAC_384_384 |
| case COSE_Algorithm_HMAC_384_384: |
| if (!HMAC_Create(pcose, 384, 384, pbKey, cbKey, pbAuthData, cbAuthData, perr)) goto errorReturn; |
| break; |
| #endif |
| |
| #ifdef USE_HMAC_512_512 |
| case COSE_Algorithm_HMAC_512_512: |
| if (!HMAC_Create(pcose, 512, 512, pbKey, cbKey, pbAuthData, cbAuthData, perr)) goto errorReturn; |
| break; |
| #endif |
| |
| default: |
| FAIL_CONDITION(COSE_ERR_INVALID_PARAMETER); |
| } |
| |
| 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 (pbKeyNew != NULL) { |
| memset(pbKeyNew, 0, cbKey); |
| COSE_FREE(pbKeyNew, context); |
| } |
| if (pbAuthData != NULL) COSE_FREE(pbAuthData, context); |
| return fRet; |
| } |
| #endif |
| |
| #if INCLUDE_MAC |
| bool COSE_Mac_validate(HCOSE_MAC h, HCOSE_RECIPIENT hRecip, cose_errback * perr) |
| { |
| COSE_MacMessage * pcose = (COSE_MacMessage *)h; |
| COSE_RecipientInfo * pRecip = (COSE_RecipientInfo *)hRecip; |
| |
| CHECK_CONDITION(IsValidMacHandle(h) && IsValidRecipientHandle(hRecip), COSE_ERR_INVALID_PARAMETER); |
| |
| return _COSE_Mac_validate(pcose, pRecip, NULL, 0, "MAC", perr); |
| |
| errorReturn: |
| return false; |
| } |
| #endif |
| |
| #if INCLUDE_MAC || INCLUDE_MAC0 |
| bool _COSE_Mac_validate(COSE_MacMessage * pcose, COSE_RecipientInfo * pRecip, const byte * pbKeyIn, size_t cbKeyIn, const char * szContext, cose_errback * perr) |
| { |
| byte * pbAuthData = NULL; |
| size_t cbitKey = 0; |
| bool fRet = false; |
| |
| int alg; |
| const cn_cbor * cn = NULL; |
| byte * pbKeyNew = NULL; |
| const byte * pbKey = NULL; |
| #ifdef USE_CBOR_CONTEXT |
| cn_cbor_context * context = &pcose->m_message.m_allocContext; |
| #endif |
| size_t cbAuthData; |
| |
| 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) 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; |
| |
| switch (alg) { |
| #ifdef USE_AES_CBC_MAC_128_64 |
| case COSE_Algorithm_CBC_MAC_128_64: |
| cbitKey = 128; |
| break; |
| #endif |
| |
| #ifdef USE_AES_CBC_MAC_128_128 |
| case COSE_Algorithm_CBC_MAC_128_128: |
| cbitKey = 128; |
| break; |
| #endif |
| |
| #ifdef USE_AES_CBC_MAC_256_64 |
| case COSE_Algorithm_CBC_MAC_256_64: |
| cbitKey = 256; |
| break; |
| #endif |
| |
| #ifdef USE_AES_CBC_MAC_256_128 |
| case COSE_Algorithm_CBC_MAC_256_128: |
| cbitKey = 256; |
| break; |
| #endif |
| |
| #ifdef USE_HMAC_256_64 |
| case COSE_Algorithm_HMAC_256_64: |
| cbitKey = 256; |
| break; |
| #endif |
| |
| #ifdef USE_HMAC_256_256 |
| case COSE_Algorithm_HMAC_256_256: |
| cbitKey = 256; |
| break; |
| #endif |
| |
| #ifdef USE_HMAC_384_384 |
| case COSE_Algorithm_HMAC_384_384: |
| cbitKey = 384; |
| break; |
| #endif |
| |
| #ifdef USE_HMAC_512_512 |
| case COSE_Algorithm_HMAC_512_512: |
| cbitKey = 512; |
| break; |
| #endif |
| default: |
| FAIL_CONDITION(COSE_ERR_UNKNOWN_ALGORITHM); |
| break; |
| } |
| } |
| |
| // Allocate the key if we have not already done so |
| |
| if (pbKeyIn != NULL) { |
| CHECK_CONDITION(cbitKey / 8 == cbKeyIn, COSE_ERR_INVALID_PARAMETER); |
| pbKey = pbKeyIn; |
| } |
| else { |
| if (pbKeyNew == NULL) { |
| pbKeyNew = COSE_CALLOC(cbitKey / 8, 1, context); |
| CHECK_CONDITION(pbKeyNew != NULL, COSE_ERR_OUT_OF_MEMORY); |
| pbKey = pbKeyNew; |
| } |
| |
| // 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 (pRecip == pRecipX) { |
| if (!_COSE_Recipient_decrypt(pRecipX, pRecip, alg, cbitKey, pbKeyNew, perr)) goto errorReturn; |
| break; |
| } |
| else if (pRecipX->m_encrypt.m_recipientFirst != NULL) { |
| if (_COSE_Recipient_decrypt(pRecipX, pRecip, alg, cbitKey, pbKeyNew, 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, pbKeyNew, perr)) break; |
| } |
| CHECK_CONDITION(pRecip != NULL, COSE_ERR_NO_RECIPIENT_FOUND); |
| } |
| } |
| |
| // Build authenticated data |
| |
| if (!_COSE_Mac_Build_AAD(&pcose->m_message, szContext, &pbAuthData, &cbAuthData, CBOR_CONTEXT_PARAM_COMMA perr)) goto errorReturn; |
| |
| switch (alg) { |
| #ifdef USE_HMAC_256_256 |
| case COSE_Algorithm_HMAC_256_256: |
| if (!HMAC_Validate(pcose, 256, 256, pbKey, cbitKey/8, pbAuthData, cbAuthData, perr)) goto errorReturn; |
| break; |
| #endif |
| |
| #ifdef USE_HMAC_256_64 |
| case COSE_Algorithm_HMAC_256_64: |
| if (!HMAC_Validate(pcose, 256, 64, pbKey, cbitKey/8, pbAuthData, cbAuthData, perr)) goto errorReturn; |
| break; |
| #endif |
| |
| #ifdef USE_HMAC_384_384 |
| case COSE_Algorithm_HMAC_384_384: |
| if (!HMAC_Validate(pcose, 384, 384, pbKey, cbitKey/8, pbAuthData, cbAuthData, perr)) goto errorReturn; |
| break; |
| #endif |
| |
| #ifdef USE_HMAC_512_512 |
| case COSE_Algorithm_HMAC_512_512: |
| if (!HMAC_Validate(pcose, 512, 512, pbKey, cbitKey/8, pbAuthData, cbAuthData, perr)) goto errorReturn; |
| break; |
| #endif |
| |
| #ifdef USE_AES_CBC_MAC_128_64 |
| case COSE_Algorithm_CBC_MAC_128_64: |
| if (!AES_CBC_MAC_Validate(pcose, 64, pbKey, cbitKey / 8, pbAuthData, cbAuthData, perr)) goto errorReturn; |
| break; |
| #endif |
| |
| #ifdef USE_AES_CBC_MAC_256_64 |
| case COSE_Algorithm_CBC_MAC_256_64: |
| if (!AES_CBC_MAC_Validate(pcose, 64, pbKey, cbitKey/8, pbAuthData, cbAuthData, perr)) goto errorReturn; |
| break; |
| #endif |
| |
| #ifdef USE_AES_CBC_MAC_128_128 |
| case COSE_Algorithm_CBC_MAC_128_128: |
| if (!AES_CBC_MAC_Validate(pcose, 128, pbKey, cbitKey / 8, pbAuthData, cbAuthData, perr)) goto errorReturn; |
| break; |
| #endif |
| |
| #ifdef USE_AES_CBC_MAC_256_128 |
| case COSE_Algorithm_CBC_MAC_256_128: |
| if (!AES_CBC_MAC_Validate(pcose, 128, pbKey, cbitKey/8, pbAuthData, cbAuthData, perr)) goto errorReturn; |
| break; |
| #endif |
| |
| default: |
| FAIL_CONDITION(COSE_ERR_UNKNOWN_ALGORITHM); |
| break; |
| } |
| |
| fRet = true; |
| |
| errorReturn: |
| if (pbKeyNew != NULL) { |
| memset(pbKeyNew, 0xff, cbitKey / 8); |
| COSE_FREE(pbKeyNew, context); |
| } |
| |
| return fRet; |
| } |
| #endif |
| |
| #if INCLUDE_MAC |
| bool COSE_Mac_AddRecipient(HCOSE_MAC hMac, HCOSE_RECIPIENT hRecip, cose_errback * perr) |
| { |
| COSE_RecipientInfo * pRecip; |
| COSE_MacMessage * pMac; |
| cn_cbor * pRecipients = NULL; |
| cn_cbor * pRecipientsT = NULL; |
| #ifdef USE_CBOR_CONTEXT |
| cn_cbor_context * context = NULL; |
| #endif |
| cn_cbor_errback cbor_error; |
| |
| CHECK_CONDITION(IsValidMacHandle(hMac), COSE_ERR_INVALID_PARAMETER); |
| CHECK_CONDITION(IsValidRecipientHandle(hRecip), COSE_ERR_INVALID_PARAMETER); |
| |
| pMac = (COSE_MacMessage *)hMac; |
| pRecip = (COSE_RecipientInfo *)hRecip; |
| |
| pRecip->m_recipientNext = pMac->m_recipientFirst; |
| pMac->m_recipientFirst = pRecip; |
| |
| #ifdef USE_CBOR_CONTEXT |
| context = &pMac->m_message.m_allocContext; |
| #endif // USE_CBOR_CONTEXT |
| |
| pRecipients = _COSE_arrayget_int(&pMac->m_message, INDEX_MAC_RECIPIENTS); |
| if (pRecipients == NULL) { |
| pRecipientsT = cn_cbor_array_create(CBOR_CONTEXT_PARAM_COMMA &cbor_error); |
| CHECK_CONDITION_CBOR(pRecipientsT != NULL, cbor_error); |
| |
| CHECK_CONDITION_CBOR(_COSE_array_replace(&pMac->m_message, pRecipientsT, INDEX_MAC_RECIPIENTS, CBOR_CONTEXT_PARAM_COMMA &cbor_error), cbor_error); |
| pRecipients = pRecipientsT; |
| pRecipientsT = NULL; |
| } |
| |
| 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: |
| if (pRecipientsT == NULL) CN_CBOR_FREE(pRecipientsT, context); |
| return false; |
| } |
| |
| |
| HCOSE_RECIPIENT COSE_Mac_GetRecipient(HCOSE_MAC cose, int iRecipient, cose_errback * perr) |
| { |
| int i; |
| COSE_RecipientInfo * p; |
| |
| CHECK_CONDITION(IsValidMacHandle(cose), COSE_ERR_INVALID_PARAMETER); |
| |
| p = ((COSE_MacMessage *)cose)->m_recipientFirst; |
| for (i = 0; i < iRecipient; i++) { |
| CHECK_CONDITION(p != NULL, COSE_ERR_NO_RECIPIENT_FOUND); |
| p = p->m_recipientNext; |
| } |
| if (p != NULL) p->m_encrypt.m_message.m_refCount++; |
| return (HCOSE_RECIPIENT)p; |
| |
| errorReturn: |
| return NULL; |
| } |
| |
| #endif |