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/** \file SignerInfo.c
* Contains implementation of the functions related to HCOSE_SIGNER handle objects.
*/
#include <stdlib.h>
#ifndef __MBED__
#include <memory.h>
#endif
#include "cose.h"
#include "cose_int.h"
#include "configure.h"
#include "crypto.h"
#if INCLUDE_SIGN
extern bool IsValidSignHandle(HCOSE_SIGN h);
COSE * SignerRoot = NULL;
bool IsValidSignerHandle(HCOSE_SIGNER h)
{
COSE_SignerInfo * p = (COSE_SignerInfo *)h;
return _COSE_IsInList(SignerRoot, (COSE *) p);
}
bool _COSE_SignerInfo_Free(COSE_SignerInfo * pSigner)
{
// Check ref counting
if (pSigner->m_message.m_refCount > 1) {
pSigner->m_message.m_refCount--;
return true;
}
_COSE_Release(&pSigner->m_message);
return true;
}
bool COSE_Signer_Free(HCOSE_SIGNER hSigner)
{
COSE_SignerInfo * pSigner = (COSE_SignerInfo *)hSigner;
bool fRet = false;
if (!IsValidSignerHandle(hSigner)) goto errorReturn;
if (pSigner->m_message.m_refCount > 1) {
pSigner->m_message.m_refCount--;
return true;
}
_COSE_SignerInfo_Free(pSigner);
_COSE_RemoveFromList(&SignerRoot, &pSigner->m_message);
COSE_FREE(pSigner, &pSigner->m_message.m_allocContext);
fRet = true;
errorReturn:
return fRet;
}
HCOSE_SIGNER COSE_Signer_Init(CBOR_CONTEXT_COMMA cose_errback * perror)
{
COSE_SignerInfo * pobj = (COSE_SignerInfo *)COSE_CALLOC(1, sizeof(COSE_SignerInfo), context);
if (pobj == NULL) {
if (perror != NULL) perror->err = COSE_ERR_OUT_OF_MEMORY;
return NULL;
}
if (!_COSE_SignerInfo_Init(COSE_INIT_FLAGS_NO_CBOR_TAG, pobj, COSE_recipient_object, CBOR_CONTEXT_PARAM_COMMA perror)) {
_COSE_SignerInfo_Free(pobj);
COSE_FREE(pobj, context);
return NULL;
}
_COSE_InsertInList(&SignerRoot, &pobj->m_message);
return (HCOSE_SIGNER)pobj;
}
bool _COSE_SignerInfo_Init(COSE_INIT_FLAGS flags, COSE_SignerInfo * pobj, int msgType, CBOR_CONTEXT_COMMA cose_errback * errp)
{
return _COSE_Init(flags, &pobj->m_message, msgType, CBOR_CONTEXT_PARAM_COMMA errp);
}
COSE_SignerInfo * _COSE_SignerInfo_Init_From_Object(cn_cbor * cbor, COSE_SignerInfo * pIn, CBOR_CONTEXT_COMMA cose_errback * perr)
{
COSE_SignerInfo * pSigner = pIn;
if (pSigner == NULL) {
pSigner = (COSE_SignerInfo *)COSE_CALLOC(1, sizeof(COSE_SignerInfo), context);
CHECK_CONDITION(pSigner != NULL, COSE_ERR_OUT_OF_MEMORY);
}
CHECK_CONDITION(cbor->type == CN_CBOR_ARRAY, COSE_ERR_INVALID_PARAMETER);
if (!_COSE_Init_From_Object(&pSigner->m_message, cbor, CBOR_CONTEXT_PARAM_COMMA perr)) goto errorReturn;
_COSE_InsertInList(&SignerRoot, &pSigner->m_message);
return pSigner;
errorReturn:
if (pSigner != NULL) {
_COSE_SignerInfo_Free(pSigner);
if (pIn == NULL) COSE_FREE(pSigner, context);
}
return NULL;
}
bool BuildToBeSigned(byte ** ppbToSign, size_t * pcbToSign, const cn_cbor * pcborBody, const cn_cbor * pcborProtected, const cn_cbor * pcborProtectedSign, const byte * pbExternal, size_t cbExternal, CBOR_CONTEXT_COMMA cose_errback * perr)
{
cn_cbor * pArray = NULL;
cn_cbor_errback cbor_error;
size_t cbToSign;
byte * pbToSign = NULL;
bool f = false;
cn_cbor * cn = NULL;
pArray = cn_cbor_array_create(CBOR_CONTEXT_PARAM_COMMA &cbor_error);
CHECK_CONDITION_CBOR(pArray != NULL, cbor_error);
cn = cn_cbor_string_create("Signature", CBOR_CONTEXT_PARAM_COMMA &cbor_error);
CHECK_CONDITION_CBOR(cn != NULL, cbor_error);
CHECK_CONDITION_CBOR(cn_cbor_array_append(pArray, cn, &cbor_error), cbor_error);
cn = NULL;
if (pcborProtected->length == 1 && (pcborProtected->v.bytes[0] == 0xa0)) cn = cn_cbor_data_create(NULL, 0, CBOR_CONTEXT_PARAM_COMMA &cbor_error);
else cn = cn_cbor_data_create(pcborProtected->v.bytes, (int)pcborProtected->length, CBOR_CONTEXT_PARAM_COMMA &cbor_error);
CHECK_CONDITION_CBOR(cn != NULL, cbor_error);
CHECK_CONDITION_CBOR(cn_cbor_array_append(pArray, cn, &cbor_error), cbor_error);
cn = NULL;
if ((pcborProtectedSign->length == 1) && (pcborProtectedSign->v.bytes[0] == 0xa0)) cn = cn_cbor_data_create(NULL, 0, CBOR_CONTEXT_PARAM_COMMA &cbor_error);
else cn = cn_cbor_data_create(pcborProtectedSign->v.bytes, (int)pcborProtectedSign->length, CBOR_CONTEXT_PARAM_COMMA &cbor_error);
CHECK_CONDITION_CBOR(cn != NULL, cbor_error);
CHECK_CONDITION_CBOR(cn_cbor_array_append(pArray, cn, &cbor_error), cbor_error);
cn = NULL;
cn = cn_cbor_data_create(pbExternal, (int) cbExternal, CBOR_CONTEXT_PARAM_COMMA &cbor_error);
CHECK_CONDITION_CBOR(cn != NULL, cbor_error);
CHECK_CONDITION_CBOR(cn_cbor_array_append(pArray, cn, &cbor_error), cbor_error);
cn = NULL;
cn = cn_cbor_data_create(pcborBody->v.bytes, (int)pcborBody->length, CBOR_CONTEXT_PARAM_COMMA &cbor_error);
CHECK_CONDITION_CBOR(cn != NULL, cbor_error);
CHECK_CONDITION_CBOR(cn_cbor_array_append(pArray, cn, &cbor_error), cbor_error);
cn = NULL;
cbToSign = cn_cbor_encode_size(pArray);
CHECK_CONDITION(cbToSign > 0, COSE_ERR_CBOR);
pbToSign = (byte *)COSE_CALLOC(cbToSign, 1, context);
CHECK_CONDITION(pbToSign != NULL, COSE_ERR_OUT_OF_MEMORY);
CHECK_CONDITION(cn_cbor_encoder_write(pbToSign, 0, cbToSign, pArray) == cbToSign, COSE_ERR_CBOR);
*ppbToSign = pbToSign;
*pcbToSign = cbToSign;
pbToSign = NULL;
f = true;
errorReturn:
if (cn != NULL) CN_CBOR_FREE(cn, context);
if (pArray != NULL) CN_CBOR_FREE(pArray, context);
if (pbToSign != NULL) COSE_FREE(pbToSign, context);
return f;
}
bool _COSE_Signer_sign(COSE_SignerInfo * pSigner, const cn_cbor * pcborBody, const cn_cbor * pcborProtected, cose_errback * perr)
{
#ifdef USE_CBOR_CONTEXT
cn_cbor_context * context = &pSigner->m_message.m_allocContext;
#endif
cn_cbor * pcborProtectedSign = NULL;
cn_cbor * pArray = NULL;
cn_cbor * cnAlgorithm = NULL;
size_t cbToSign;
byte * pbToSign = NULL;
bool f;
int alg;
bool fRet = false;
pArray = cn_cbor_array_create(CBOR_CONTEXT_PARAM_COMMA NULL);
CHECK_CONDITION(pArray != NULL, COSE_ERR_OUT_OF_MEMORY);
cnAlgorithm = _COSE_map_get_int(&pSigner->m_message, COSE_Header_Algorithm, COSE_BOTH, perr);
if (cnAlgorithm == NULL) goto errorReturn;
if (cnAlgorithm->type == CN_CBOR_TEXT) {
FAIL_CONDITION(COSE_ERR_UNKNOWN_ALGORITHM);
}
else {
CHECK_CONDITION((cnAlgorithm->type == CN_CBOR_UINT || cnAlgorithm->type == CN_CBOR_INT), COSE_ERR_INVALID_PARAMETER);
alg = (int)cnAlgorithm->v.sint;
}
pcborProtectedSign = _COSE_encode_protected(&pSigner->m_message, perr);
if (pcborProtectedSign == NULL) goto errorReturn;
if (!BuildToBeSigned(&pbToSign, &cbToSign, pcborBody, pcborProtected, pcborProtectedSign, pSigner->m_message.m_pbExternal, pSigner->m_message.m_cbExternal, CBOR_CONTEXT_PARAM_COMMA perr)) goto errorReturn;
switch (alg) {
#ifdef USE_ECDSA_SHA_256
case COSE_Algorithm_ECDSA_SHA_256:
if (!ECDSA_Sign(&pSigner->m_message, INDEX_SIGNATURE, pSigner->m_pkey, 256, pbToSign, cbToSign, perr)) goto errorReturn;
break;
#endif
#ifdef USE_ECDSA_SHA_384
case COSE_Algorithm_ECDSA_SHA_384:
if (!ECDSA_Sign(&pSigner->m_message, INDEX_SIGNATURE, pSigner->m_pkey, 384, pbToSign, cbToSign, perr)) goto errorReturn;
break;
#endif
#ifdef USE_ECDSA_SHA_512
case COSE_Algorithm_ECDSA_SHA_512:
if (!ECDSA_Sign(&pSigner->m_message, INDEX_SIGNATURE, pSigner->m_pkey, 512, pbToSign, cbToSign, perr)) goto errorReturn;
break;
#endif
default:
FAIL_CONDITION(COSE_ERR_UNKNOWN_ALGORITHM);
}
fRet = true;
errorReturn:
if (pArray != NULL) COSE_FREE(pArray, context);
if (pbToSign != NULL) COSE_FREE(pbToSign, context);
return fRet;
}
bool COSE_Signer_SetKey(HCOSE_SIGNER h, const cn_cbor * pKey, cose_errback * perr)
{
COSE_SignerInfo * p;
bool fRet = false;
CHECK_CONDITION(IsValidSignerHandle(h), COSE_ERR_INVALID_HANDLE);
CHECK_CONDITION(pKey != NULL, COSE_ERR_INVALID_PARAMETER);
p = (COSE_SignerInfo *)h;
p->m_pkey = pKey;
fRet = true;
errorReturn:
return fRet;
}
/*!
* @brief Set the application external data for authentication
*
* Signer 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_Signer_SetExternal(HCOSE_SIGNER hcose, const byte * pbExternalData, size_t cbExternalData, cose_errback * perr)
{
if (!IsValidSignerHandle(hcose)) {
if (perr != NULL) perr->err = COSE_ERR_INVALID_HANDLE;
return false;
}
return _COSE_SetExternal(&((COSE_SignerInfo *)hcose)->m_message, pbExternalData, cbExternalData, perr);
}
bool _COSE_Signer_validate(COSE_SignMessage * pSign, COSE_SignerInfo * pSigner, const cn_cbor * pcborBody, const cn_cbor * pcborProtected, cose_errback * perr)
{
byte * pbToBeSigned = NULL;
int alg;
const cn_cbor * cn = NULL;
#ifdef USE_CBOR_CONTEXT
cn_cbor_context * context = NULL;
#endif
size_t cbToBeSigned;
bool fRet = false;
#ifdef USE_CBOR_CONTEXT
context = &pSign->m_message.m_allocContext;
#endif
cn = _COSE_map_get_int(&pSigner->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.sint;
}
// Build protected headers
cn_cbor * cnProtected = _COSE_arrayget_int(&pSigner->m_message, INDEX_PROTECTED);
CHECK_CONDITION((cnProtected != NULL) && (cnProtected->type == CN_CBOR_BYTES), COSE_ERR_INVALID_PARAMETER);
// Build authenticated data
if (!BuildToBeSigned(&pbToBeSigned, &cbToBeSigned, pcborBody, pcborProtected, cnProtected, pSigner->m_message.m_pbExternal, pSigner->m_message.m_cbExternal, CBOR_CONTEXT_PARAM_COMMA perr)) goto errorReturn;
cn_cbor * cnSignature = _COSE_arrayget_int(&pSigner->m_message, INDEX_SIGNATURE);
CHECK_CONDITION((cnSignature != NULL) && (cnSignature->type == CN_CBOR_BYTES), COSE_ERR_INVALID_PARAMETER);
switch (alg) {
#ifdef USE_ECDSA_SHA_256
case COSE_Algorithm_ECDSA_SHA_256:
if (!ECDSA_Verify(&pSigner->m_message, INDEX_SIGNATURE, pSigner->m_pkey, 256, pbToBeSigned, cbToBeSigned, perr)) goto errorReturn;
break;
#endif
#ifdef USE_ECDSA_SHA_384
case COSE_Algorithm_ECDSA_SHA_384:
if (!ECDSA_Verify(&pSigner->m_message, INDEX_SIGNATURE, pSigner->m_pkey, 384, pbToBeSigned, cbToBeSigned, perr)) goto errorReturn;
break;
#endif
#ifdef USE_ECDSA_SHA_512
case COSE_Algorithm_ECDSA_SHA_512:
if (!ECDSA_Verify(&pSigner->m_message, INDEX_SIGNATURE, pSigner->m_pkey, 512, pbToBeSigned, cbToBeSigned, perr)) goto errorReturn;
break;
#endif
default:
FAIL_CONDITION(COSE_ERR_UNKNOWN_ALGORITHM);
break;
}
fRet = true;
errorReturn:
if (pbToBeSigned != NULL) COSE_FREE(pbToBeSigned, context);
return fRet;
}
cn_cbor * COSE_Signer_map_get_int(HCOSE_SIGNER h, int key, int flags, cose_errback * perr)
{
if (!IsValidSignerHandle(h)) {
if (perr != NULL) perr->err = COSE_ERR_INVALID_HANDLE;
return NULL;
}
return _COSE_map_get_int((COSE *)h, key, flags, perr);
}
bool COSE_Signer_map_put_int(HCOSE_SIGNER h, int key, cn_cbor * value, int flags, cose_errback * perr)
{
bool fRet = false;
CHECK_CONDITION(IsValidSignerHandle(h), COSE_ERR_INVALID_HANDLE);
CHECK_CONDITION(value != NULL, COSE_ERR_INVALID_PARAMETER);
return _COSE_map_put(&((COSE_SignerInfo *)h)->m_message, key, value, flags, perr);
errorReturn:
return fRet;
}
#endif