| #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 RgbDontUse2[8 * 1024]; // Remove this array when we can compute the size of a cbor serialization without this hack. |
| |
| |
| bool IsValidMacHandle(HCOSE_MAC h) |
| { |
| COSE_MacMessage * p = (COSE_MacMessage *)h; |
| if (p == NULL) return false; |
| return true; |
| } |
| |
| |
| HCOSE_MAC COSE_Mac_Init(CBOR_CONTEXT_COMMA cose_errback * perr) |
| { |
| COSE_MacMessage * pobj = (COSE_MacMessage *)COSE_CALLOC(1, sizeof(COSE_MacMessage), context); |
| if (pobj == NULL) { |
| if (perr != NULL) perr->err = COSE_ERR_OUT_OF_MEMORY; |
| return NULL; |
| } |
| |
| if (!_COSE_Init(&pobj->m_message, MSG_TYPE_MAC, CBOR_CONTEXT_PARAM_COMMA perr)) { |
| COSE_Mac_Free((HCOSE_MAC)pobj); |
| return NULL; |
| } |
| |
| return (HCOSE_MAC)pobj; |
| } |
| |
| 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 ((pIn == NULL) && (pobj != NULL)) COSE_FREE(pobj, context); |
| return NULL; |
| } |
| |
| if (!_COSE_Init_From_Object(&pobj->m_message, cbor, CBOR_CONTEXT_PARAM_COMMA perr)) { |
| goto errorReturn; |
| } |
| |
| #ifdef USE_ARRAY |
| pRecipients = _COSE_arrayget_int(&pobj->m_message, INDEX_MAC_RECIPIENTS); |
| #else |
| pRecipients = (cn_cbor *)cn_cbor_mapget_int(cbor, COSE_Header_Recipients); |
| #endif |
| 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; |
| } |
| } |
| |
| return(HCOSE_MAC)pobj; |
| } |
| |
| bool COSE_Mac_Free(HCOSE_MAC h) |
| { |
| #ifdef USE_CBOR_CONTEXT |
| cn_cbor_context context; |
| #endif |
| |
| if (!IsValidMacHandle(h)) return false; |
| |
| #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; |
| } |
| |
| void _COSE_Mac_Release(COSE_MacMessage * p) |
| { |
| // if (p->pbContent != NULL) COSE_FREE(p->pbContent, &p->m_message.m_allocContext); |
| // if (p->pbIV != NULL) COSE_FREE(p->pbIV, &p->m_message.m_allocContext); |
| if (p->pbKey != NULL) COSE_FREE(p->pbKey, &p->m_message.m_allocContext); |
| |
| _COSE_Release(&p->m_message); |
| } |
| |
| |
| |
| HCOSE_RECIPIENT COSE_Mac_add_shared_secret(HCOSE_MAC hcose, COSE_Algorithms alg, byte * rgbKey, int cbKey, byte * rgbKid, int cbKid, cose_errback * perr) |
| { |
| #ifdef USE_CBOR_CONTEXT |
| cn_cbor_context * context; |
| #endif // USE_CBOR_CONTEXT |
| COSE_RecipientInfo * pobj; |
| COSE_MacMessage * pcose = (COSE_MacMessage *)hcose; |
| cn_cbor * pRecipients = NULL; |
| cn_cbor * pRecipientsNew = NULL; |
| |
| if (!IsValidMacHandle(hcose) || (rgbKey == NULL)) { |
| if (perr != NULL) perr->err = COSE_ERR_INVALID_PARAMETER; |
| return NULL; |
| } |
| |
| switch (alg) { |
| case COSE_Algorithm_Direct: |
| break; |
| |
| default: |
| if (perr != NULL) perr->err = COSE_ERR_INVALID_PARAMETER; |
| return NULL; |
| } |
| |
| |
| #ifdef USE_CBOR_CONTEXT |
| context = &pcose->m_message.m_allocContext; |
| #endif // USE_CBOR_CONTEXT |
| |
| pobj = (COSE_RecipientInfo *)COSE_CALLOC(1, sizeof(COSE_RecipientInfo), context); |
| if (pobj == NULL) { |
| oom_error: |
| if (perr != NULL) perr->err = COSE_ERR_OUT_OF_MEMORY; |
| error: |
| errorReturn: |
| if (pRecipientsNew != NULL) CN_CBOR_FREE(pRecipientsNew, context); |
| // if (pobj != NULL) COSE_Recipient_Free(pobj); |
| return NULL; |
| } |
| |
| if (!_COSE_Init(&pobj->m_encrypt.m_message, MSG_TYPE_NONE, CBOR_CONTEXT_PARAM_COMMA perr)) { |
| goto error; |
| } |
| |
| CHECK_CONDITION(cn_cbor_mapput_int(pobj->m_encrypt.m_message.m_unprotectMap, COSE_Header_Algorithm, cn_cbor_int_create(alg, CBOR_CONTEXT_PARAM_COMMA NULL), CBOR_CONTEXT_PARAM_COMMA NULL), COSE_ERR_OUT_OF_MEMORY); |
| |
| if (cbKid > 0) { |
| byte * pb = (byte *)COSE_CALLOC(cbKid, 1, context); |
| if (pb == NULL) goto oom_error; |
| memcpy(pb, rgbKid, cbKid); |
| if (!cn_cbor_mapput_int(pobj->m_encrypt.m_message.m_unprotectMap, COSE_Header_KID, cn_cbor_data_create(pb, cbKid, CBOR_CONTEXT_PARAM_COMMA NULL), CBOR_CONTEXT_PARAM_COMMA NULL)) { |
| COSE_FREE(pb, context); |
| goto oom_error; // M00BUG - get error from CBOR |
| } |
| } |
| |
| |
| pobj->m_encrypt.pbKey = (byte *)COSE_CALLOC(cbKey, 1, context); |
| CHECK_CONDITION(pobj->m_encrypt.pbKey != NULL, COSE_ERR_OUT_OF_MEMORY); |
| |
| memcpy(pobj->m_encrypt.pbKey, rgbKey, cbKey); |
| pobj->m_encrypt.cbKey = cbKey; |
| |
| pobj->m_recipientNext = pcose->m_recipientFirst; |
| pcose->m_recipientFirst = pobj; |
| |
| #ifdef USE_ARRAY |
| pRecipients = _COSE_arrayget_int(&pcose->m_message, INDEX_MAC_RECIPIENTS); |
| #else |
| cn_cbor * pRecipients = (cn_cbor *)cn_cbor_mapget_int(pcose->m_message.m_cbor, COSE_Header_Recipients); |
| #endif |
| if (pRecipients == NULL) { |
| pRecipients = pRecipientsNew = cn_cbor_array_create(CBOR_CONTEXT_PARAM_COMMA NULL); |
| CHECK_CONDITION(pRecipients != NULL, COSE_ERR_OUT_OF_MEMORY); |
| pRecipientsNew = NULL; |
| |
| #ifdef USE_ARRAY |
| CHECK_CONDITION(_COSE_array_replace(&pcose->m_message, pRecipients, INDEX_MAC_RECIPIENTS, CBOR_CONTEXT_PARAM_COMMA NULL), COSE_ERR_OUT_OF_MEMORY); |
| #else |
| if (!cn_cbor_mapput_int(pcose->m_message.m_cbor, COSE_Header_Recipients, pRecipients, CBOR_CONTEXT_PARAM_COMMA NULL)) { |
| cn_cbor_free(pRecipients, context); |
| goto error; |
| } |
| #endif |
| } |
| |
| CHECK_CONDITION(cn_cbor_array_append(pRecipients, pobj->m_encrypt.m_message.m_cbor, NULL), COSE_ERR_CBOR); |
| |
| pobj->m_encrypt.m_message.m_flags |= 1; |
| return (HCOSE_RECIPIENT)pobj; |
| } |
| |
| void COSE_Mac_SetContent(HCOSE_MAC cose, const byte * rgbContent, size_t cbContent, cose_errback * perr) |
| { |
| COSE_MacMessage * p = (COSE_MacMessage *)cose; |
| cn_cbor_context * context = &p->m_message.m_allocContext; |
| cn_cbor * ptmp = NULL; |
| |
| if (!IsValidMacHandle(cose)) { |
| if (perr != NULL) perr->err = COSE_ERR_INVALID_PARAMETER; |
| errorReturn: |
| if (ptmp != NULL) CN_CBOR_FREE(ptmp, context); |
| return; |
| } |
| |
| p->pbContent = rgbContent; |
| p->cbContent = cbContent; |
| |
| ptmp = cn_cbor_data_create(rgbContent, cbContent, CBOR_CONTEXT_PARAM_COMMA NULL); |
| CHECK_CONDITION(ptmp != NULL, CN_CBOR_ERR_OUT_OF_MEMORY); |
| |
| #ifdef USE_ARRAY |
| CHECK_CONDITION(_COSE_array_replace(&p->m_message, ptmp, INDEX_BODY, CBOR_CONTEXT_PARAM_COMMA NULL), COSE_ERR_CBOR); |
| ptmp = NULL; |
| #else |
| if (!cn_cbor_mapput_int(p->m_message.m_cbor, COSE_Header_PlainText, cn_cbor_data_create (rgbContent, cbContent, CBOR_CONTEXT_PARAM_COMMA NULL), CBOR_CONTEXT_PARAM_COMMA NULL)) { |
| if (errp != NULL) errp->err = COSE_ERR_CBOR; |
| return; |
| } |
| #endif |
| } |
| |
| |
| 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(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); |
| } |
| |
| |
| bool COSE_Mac_encrypt(HCOSE_MAC h, cose_errback * perr) |
| { |
| int alg; |
| int t; |
| COSE_RecipientInfo * pri; |
| const cn_cbor * cn_Alg = NULL; |
| byte * pbAuthData = NULL; |
| cn_cbor * pAuthData = NULL; |
| cn_cbor * ptmp = NULL; |
| size_t cbitKey; |
| cn_cbor_context * context; |
| COSE_Encrypt * pcose = (COSE_Encrypt *)h; |
| cose_errback error; |
| |
| if (!IsValidMacHandle(h)) { |
| if (perr != NULL) perr->err = COSE_ERR_INVALID_PARAMETER; |
| return false; |
| } |
| #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, &error); |
| |
| if (cn_Alg == NULL) { |
| error: |
| if (perr != NULL) *perr = error; |
| errorReturn: |
| if (pbAuthData != NULL) COSE_FREE(pbAuthData, context); |
| if (pAuthData != NULL) cn_cbor_free(pAuthData CBOR_CONTEXT_PARAM); |
| if (ptmp != NULL) cn_cbor_free(ptmp CBOR_CONTEXT_PARAM); |
| return false; |
| } |
| if (cn_Alg->type != CN_CBOR_UINT) goto error; |
| alg = cn_Alg->v.uint; |
| |
| // Get the key size |
| |
| switch (alg) { |
| case COSE_Algorithm_HMAC_256_256: |
| cbitKey = 256; |
| break; |
| |
| default: |
| goto error; |
| } |
| |
| // If we are doing direct encryption - then recipient generates the key |
| |
| if (pcose->pbKey == NULL) { |
| t = 0; |
| for (pri = pcose->m_recipientFirst; pri != NULL; pri = pri->m_recipientNext) { |
| if (pri->m_encrypt.m_message.m_flags & 1) { |
| t |= 1; |
| pcose->pbKey = _COSE_RecipientInfo_generateKey(pri, cbitKey); |
| if (pcose->pbKey == NULL) goto error; |
| pcose->cbKey = cbitKey / 8; |
| } |
| else { |
| t |= 2; |
| } |
| } |
| if (t == 3) { |
| error.err = CN_CBOR_ERR_INVALID_PARAMETER; |
| goto error; |
| } |
| } |
| |
| if (pcose->pbKey == NULL) { |
| pcose->pbKey = (byte *)COSE_CALLOC(cbitKey / 8, 1, context); |
| if (pcose->pbKey == NULL) goto error; |
| pcose->cbKey = cbitKey / 8; |
| rand_bytes(pcose->pbKey, pcose->cbKey); |
| } |
| |
| // Build protected headers |
| |
| cn_cbor * cbProtected = _COSE_encode_protected(&pcose->m_message, &error); |
| if (cbProtected == NULL) goto error; |
| |
| // Add Unprotected headers |
| #ifdef USE_ARRAY |
| #else |
| if (pcose->m_message.m_unprotectMap->first_child != NULL) { |
| if (!cn_cbor_mapput_int(pcose->m_message.m_cbor, COSE_Header_Unprotected, pcose->m_message.m_unprotectMap, CBOR_CONTEXT_PARAM_COMMA NULL)) goto error; |
| pcose->m_message.m_ownUnprotectedMap = false; |
| } |
| #endif |
| |
| // Build authenticated data |
| // Protected headers |
| // external data |
| // body |
| |
| ssize_t cbAuthData = 0; |
| pAuthData = cn_cbor_array_create(CBOR_CONTEXT_PARAM_COMMA NULL); |
| |
| ptmp = cn_cbor_data_create(cbProtected->v.str, cbProtected->length, CBOR_CONTEXT_PARAM_COMMA NULL); |
| if (ptmp == NULL) goto error; |
| cn_cbor_array_append(pAuthData, ptmp, NULL); |
| ptmp = NULL; |
| |
| ptmp = cn_cbor_data_create(NULL, 0, CBOR_CONTEXT_PARAM_COMMA NULL); |
| if (ptmp == NULL) goto error; |
| cn_cbor_array_append(pAuthData, ptmp, NULL); |
| ptmp = NULL; |
| |
| ptmp = cn_cbor_data_create(pcose->pbContent, pcose->cbContent, CBOR_CONTEXT_PARAM_COMMA NULL); |
| if (ptmp == NULL) goto error; |
| cn_cbor_array_append(pAuthData, ptmp, NULL); |
| ptmp = NULL; |
| |
| cbAuthData = cn_cbor_encoder_write(RgbDontUse2, 0, sizeof(RgbDontUse2), pAuthData); |
| pbAuthData = (byte *)COSE_CALLOC(cbAuthData, 1, context); |
| if (pbAuthData == NULL) goto error; |
| if (cn_cbor_encoder_write(pbAuthData, 0, cbAuthData, pAuthData) != cbAuthData) goto error; |
| |
| switch (alg) { |
| case COSE_Algorithm_HMAC_256_256: |
| if (!HMAC_Create(pcose, 256, 256, pbAuthData, cbAuthData, &error)) goto error; |
| break; |
| |
| default: |
| return false; |
| } |
| |
| for (pri = pcose->m_recipientFirst; pri != NULL; pri = pri->m_recipientNext) { |
| _COSE_Encrypt_SetContent(&pri->m_encrypt, pcose->pbKey, pcose->cbKey, &error); |
| if (error.err != COSE_ERR_NONE) goto error; |
| |
| if (!COSE_Encrypt_encrypt((HCOSE_ENCRYPT)&pri->m_encrypt, &error)) goto error; |
| } |
| |
| // Figure out the clean up |
| |
| if (pbAuthData != NULL) COSE_FREE(pbAuthData, context); |
| if (pAuthData != NULL) cn_cbor_free(pAuthData CBOR_CONTEXT_PARAM); |
| |
| return true; |
| } |
| |
| byte RgbDontUseMac[1024]; |
| |
| bool COSE_Mac_validate(HCOSE_MAC h, HCOSE_RECIPIENT hRecip, cose_errback * perr) |
| { |
| COSE_Encrypt * pcose = (COSE_Encrypt *)h; |
| COSE_RecipientInfo * pRecip = (COSE_RecipientInfo *)hRecip; |
| cose_errback error = { 0 }; |
| |
| if (!IsValidMacHandle(h) || (!IsValidRecipientHandle(hRecip))) { |
| if (perr != NULL) perr->err = COSE_ERR_INVALID_PARAMETER; |
| return false; |
| } |
| |
| int cbitKey = 0; |
| byte * pbKeyIn = NULL; |
| |
| int alg; |
| const cn_cbor * cn = NULL; |
| |
| byte * pbKey = pbKeyIn; |
| cn_cbor_context * context; |
| byte * pbAuthData = NULL; |
| ssize_t cbAuthData; |
| cn_cbor * pAuthData = NULL; |
| cn_cbor * ptmp = NULL; |
| |
| #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 (pbAuthData != NULL) COSE_FREE(pbAuthData, context); |
| if (pAuthData != NULL) cn_cbor_free(pAuthData CBOR_CONTEXT_PARAM); |
| if ((pbKey != NULL) && (pbKeyIn == NULL)) { |
| memset(pbKey, 0xff, cbitKey / 8); |
| COSE_FREE(pbKey, context); |
| } |
| return false; |
| } |
| CHECK_CONDITION(cn->type == CN_CBOR_UINT, CN_CBOR_ERR_INVALID_PARAMETER); |
| alg = cn->v.uint; |
| |
| switch (alg) { |
| case COSE_Algorithm_HMAC_256_256: |
| cbitKey = 256; |
| break; |
| |
| default: |
| FAIL_CONDITION(false, COSE_ERR_UNKNOWN_ALGORITHM); |
| break; |
| } |
| |
| // 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 |
| |
| for (pRecip = pcose->m_recipientFirst; pRecip != NULL; pRecip = pRecip->m_recipientNext) { |
| if (_COSE_Recipient_decrypt(pRecip, cbitKey, pbKey, perr)) break; |
| } |
| |
| // Build protected headers |
| |
| cn_cbor * cnProtected = _COSE_arrayget_int(&pcose->m_message, INDEX_PROTECTED); |
| cn_cbor * cnContent = _COSE_arrayget_int(&pcose->m_message, INDEX_BODY); |
| |
| // Build authenticated data |
| pbAuthData = NULL; |
| pAuthData = cn_cbor_array_create(CBOR_CONTEXT_PARAM_COMMA NULL); |
| |
| ptmp = cn_cbor_data_create(cnProtected->v.bytes, cnProtected->length, CBOR_CONTEXT_PARAM_COMMA NULL); |
| CHECK_CONDITION(ptmp != NULL, COSE_ERR_CBOR); |
| cn_cbor_array_append(pAuthData, ptmp, NULL); |
| |
| ptmp = cn_cbor_data_create(NULL, 0, CBOR_CONTEXT_PARAM_COMMA NULL); |
| CHECK_CONDITION(ptmp != NULL, COSE_ERR_CBOR); |
| cn_cbor_array_append(pAuthData, ptmp, NULL); |
| |
| ptmp = cn_cbor_data_create(cnContent->v.bytes, cnContent->length, CBOR_CONTEXT_PARAM_COMMA NULL); |
| CHECK_CONDITION(ptmp != NULL, COSE_ERR_CBOR); |
| cn_cbor_array_append(pAuthData, ptmp, NULL); |
| |
| cbAuthData = cn_cbor_encoder_write(RgbDontUseMac, 0, sizeof(RgbDontUseMac), pAuthData); |
| 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); |
| |
| switch (alg) { |
| case COSE_Algorithm_HMAC_256_256: |
| if (!HMAC_Validate(pcose, 256, 256, pbAuthData, cbAuthData, &error)) goto error; |
| break; |
| |
| default: |
| FAIL_CONDITION(false, COSE_ERR_UNKNOWN_ALGORITHM); |
| break; |
| } |
| |
| if (pbAuthData != NULL) COSE_FREE(pbAuthData, context); |
| if (pAuthData != NULL) cn_cbor_free(pAuthData CBOR_CONTEXT_PARAM); |
| if ((pbKey != NULL) && (pbKeyIn == NULL)) COSE_FREE(pbKey, context); |
| if (perr != NULL) perr->err = COSE_ERR_NONE; |
| |
| return true; |
| |
| } |
| |
| |
| |
| HCOSE_RECIPIENT COSE_Mac_GetRecipient(HCOSE_MAC cose, int iRecipient, cose_errback * perr) |
| { |
| int i; |
| COSE_RecipientInfo * p; |
| |
| if (!IsValidMacHandle(cose)) { |
| if (perr != NULL) perr->err = COSE_ERR_INVALID_PARAMETER; |
| return NULL; |
| } |
| |
| p = ((COSE_MacMessage *)cose)->m_recipientFirst; |
| for (i = 0; i < iRecipient; i++) { |
| if (p == NULL) { |
| if (perr != NULL) perr->err = COSE_ERR_INVALID_PARAMETER; |
| return NULL; |
| } |
| p = p->m_recipientNext; |
| } |
| return (HCOSE_RECIPIENT)p; |
| } |