| /** \file Encrypt.c |
| * Contains implementation of the functions related to HCOSE_ENVELOPED handle objects. |
| */ |
| |
| #include <stdlib.h> |
| #ifndef __MBED__ |
| #include <memory.h> |
| #else |
| #include <stddef.h> |
| #endif |
| #include <stdio.h> |
| #include <assert.h> |
| |
| #include "cose.h" |
| #include "cose_int.h" |
| #include "configure.h" |
| #include "crypto.h" |
| |
| #if INCLUDE_ENCRYPT || INCLUDE_MAC |
| void _COSE_Enveloped_Release(COSE_Enveloped * p); |
| |
| COSE * EnvelopedRoot = NULL; |
| #endif |
| |
| #if INCLUDE_ENCRYPT |
| /*! \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; |
| } |
| #endif |
| |
| #if INCLUDE_ENCRYPT || INCLUDE_MAC |
| 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; |
| } |
| #endif |
| |
| #if INCLUDE_ENCRYPT |
| 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; |
| } |
| #endif |
| |
| #if INCLUDE_ENCRYPT || INCLUDE_MAC |
| 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); |
| } |
| #endif |
| |
| #if INCLUDE_ENCRYPT |
| 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, "Encrypt", perr); |
| |
| errorReturn: |
| return f; |
| } |
| #endif |
| |
| #if INCLUDE_ENCRYPT || INCLUDE_ENCRYPT0 |
| bool _COSE_Enveloped_decrypt(COSE_Enveloped * pcose, COSE_RecipientInfo * pRecip, const byte *pbKeyIn, size_t cbKeyIn, const char * szContext, cose_errback * perr) |
| { |
| int alg; |
| const cn_cbor * cn = NULL; |
| byte * pbKeyNew = NULL; |
| const byte * pbKey = NULL; |
| size_t cbitKey = 0; |
| #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 (pbKeyNew != NULL) { |
| memset(pbKeyNew, 0xff, cbitKey / 8); |
| COSE_FREE(pbKeyNew, 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) { |
| CHECK_CONDITION(cbKeyIn == cbitKey / 8, COSE_ERR_INVALID_PARAMETER); |
| pbKey = pbKeyIn; |
| } |
| #ifdef INCLUDE_ENCRYPT |
| else { |
| // Allocate the key if we have not already done so |
| |
| 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 (pRecipX == pRecip) { |
| 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); |
| } |
| } |
| #endif // INCLUDE_ENCRYPT |
| |
| // 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 (pbKeyNew != NULL) COSE_FREE(pbKeyNew, context); |
| if (perr != NULL) perr->err = COSE_ERR_NONE; |
| |
| return true; |
| } |
| #endif |
| |
| #if INCLUDE_ENCRYPT |
| 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, "Encrypt", perr); |
| |
| errorReturn: |
| return false; |
| } |
| #endif |
| |
| #if INCLUDE_ENCRYPT || INCLUDE_ENCRYPT0 |
| 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 * pbKeyNew = NULL; |
| const 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; |
| } |
| #ifdef INCLUDE_ENCRYPT |
| 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; |
| pbKeyNew = _COSE_RecipientInfo_generateKey(pri, alg, cbitKey, perr); |
| cbKey = cbitKey / 8; |
| if (pbKeyNew == NULL) goto errorReturn; |
| } |
| 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); |
| cbKey = cbitKey / 8; |
| rand_bytes(pbKeyNew, cbKey); |
| } |
| pbKey = pbKeyNew; |
| } |
| #endif // INCLUDE_ENCRYPT |
| |
| // Build protected headers |
| |
| const cn_cbor * cbProtected = _COSE_encode_protected(&pcose->m_message, perr); |
| if (cbProtected == NULL) goto errorReturn; |
| |
| |
| #ifdef USE_COUNTER_SIGNATURES |
| // Setup Counter Signatures |
| if (!_COSE_CountSign_create(&pcose->m_message, NULL, CBOR_CONTEXT_PARAM_COMMA perr)) { |
| goto errorReturn; |
| } |
| #endif |
| |
| // 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); |
| } |
| |
| #ifdef INCLUDE_ENCRYPT |
| for (pri = pcose->m_recipientFirst; pri != NULL; pri = pri->m_recipientNext) { |
| if (!_COSE_Recipient_encrypt(pri, pbKey, cbKey, perr)) goto errorReturn; |
| } |
| #endif // INCLUDE_ENCRYPT |
| |
| // Figure out the clean up |
| |
| fRet = true; |
| |
| errorReturn: |
| if (pbAuthData != NULL) COSE_FREE(pbAuthData, context); |
| if (pbKeyNew != NULL) { |
| memset(pbKeyNew, 0, cbKey); |
| COSE_FREE(pbKeyNew, context); |
| } |
| return fRet; |
| } |
| #endif |
| |
| #if INCLUDE_ENCRYPT |
| 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; |
| } |
| #endif |
| |
| #if INCLUDE_ENCRYPT || INCLUDE_ENCRYPT0 || INCLUDE_MAC || INCLUDE_MAC0 |
| 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_encode_size(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; |
| |
| #if 0 |
| { |
| printf("Encrypt* AAD = "); |
| int iX; |
| for (iX=0; iX < cbAuthData; iX++) { |
| printf("%02x ", pbAuthData[iX]); |
| } |
| printf("\n"); |
| } |
| #endif |
| |
| |
| 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; |
| } |
| #endif |
| |
| #if INCLUDE_ENCRYPT |
| 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; |
| } |
| |
| #ifdef USE_COUNTER_SIGNATURES |
| bool COSE_Enveloped_AddCounterSigner(HCOSE_ENCRYPT hEnv, HCOSE_COUNTERSIGN hSign, cose_errback * perr) |
| { |
| CHECK_CONDITION(IsValidEncryptHandle(hEnv), COSE_ERR_INVALID_HANDLE); |
| return _COSE_CounterSign_add(&((COSE_Enveloped *)hEnv)->m_message, hSign, perr); |
| |
| errorReturn: |
| return false; |
| } |
| |
| HCOSE_COUNTERSIGN COSE_Enveloped_GetCounterSigner(HCOSE_ENCRYPT h, int iSigner, cose_errback * perr) |
| { |
| CHECK_CONDITION(IsValidEncryptHandle(h), COSE_ERR_INVALID_HANDLE); |
| return _COSE_CounterSign_get(&((COSE_Enveloped *)h)->m_message, iSigner, perr); |
| |
| errorReturn: |
| return NULL; |
| } |
| #endif |
| |
| #endif |