blob: e8d2e39c2ec668195acdc1046f8f4ac8e1581b6e [file] [log] [blame]
#include <stdlib.h>
#include <memory.h>
#include "cose.h"
#include "cose_int.h"
#include "configure.h"
#include "crypto.h"
extern bool IsValidSignHandle(HCOSE_SIGN h);
bool IsValidSignerHandle(HCOSE_SIGNER h)
{
if (h == NULL) return false;
return true;
}
void _COSE_Signer_Free(COSE_SignerInfo * pSigner)
{
COSE_FREE(pSigner, &pSigner->m_message.m_allocContext);
return;
}
HCOSE_SIGNER COSE_Sign_GetSigner(HCOSE_SIGN cose, int iSigner, cose_errback * perr)
{
int i;
COSE_SignerInfo * p;
if (!IsValidSignHandle(cose)) {
if (perr != NULL) perr->err = COSE_ERR_INVALID_PARAMETER;
return NULL;
}
p = ((COSE_SignMessage *)cose)->m_signerFirst;
for (i = 0; i < iSigner; i++) {
if (p == NULL) {
if (perr != NULL) perr->err = COSE_ERR_INVALID_PARAMETER;
return NULL;
}
p = p->m_signerNext;
}
return (HCOSE_SIGNER)p;
}
COSE_SignerInfo * _COSE_SignerInfo_Init_From_Object(cn_cbor * cbor, CBOR_CONTEXT_COMMA cose_errback * perr)
{
COSE_SignerInfo * 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)) {
_COSE_Signer_Free(pSigner);
return NULL;
}
return pSigner;
errorReturn:
if (pSigner != NULL) COSE_FREE(pSigner, context);
return NULL;
}
byte RgbDontUse4[1024];
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 * pcborBody2 = NULL;
cn_cbor * pcborProtected2 = NULL;
cn_cbor * pcborProtectedSign = NULL;
cn_cbor * pcborProtectedSign2 = NULL;
cn_cbor * pArray = NULL;
size_t cbToSign;
byte * pbToSign = NULL;
bool f;
pArray = cn_cbor_array_create(CBOR_CONTEXT_PARAM_COMMA NULL);
if (pArray == NULL) {
if (perr != NULL) perr->err = COSE_ERR_OUT_OF_MEMORY;
errorReturn:
if (pcborBody2 != NULL) CN_CBOR_FREE(pcborBody2, context);
if (pcborProtected2 != NULL) CN_CBOR_FREE(pcborProtected2, context);
if (pArray != NULL) COSE_FREE(pArray, context);
if (pbToSign != NULL) COSE_FREE(pbToSign, context);
return false;
}
pcborProtectedSign = _COSE_encode_protected(&pSigner->m_message, perr);
if (pcborProtectedSign == NULL) goto errorReturn;
pcborBody2 = cn_cbor_data_create(pcborBody->v.bytes, (int) pcborBody->length, CBOR_CONTEXT_PARAM_COMMA NULL);
CHECK_CONDITION(pcborBody2 != NULL, COSE_ERR_OUT_OF_MEMORY);
pcborProtected2 = cn_cbor_data_create(pcborProtected->v.bytes, (int) pcborProtected->length, CBOR_CONTEXT_PARAM_COMMA NULL);
CHECK_CONDITION(pcborProtected2 != NULL, COSE_ERR_OUT_OF_MEMORY);
pcborProtectedSign2 = cn_cbor_data_create(pcborProtectedSign->v.bytes, (int) pcborProtectedSign->length, CBOR_CONTEXT_PARAM_COMMA NULL);
CHECK_CONDITION(pcborProtectedSign2 != NULL, COSE_ERR_OUT_OF_MEMORY);
CHECK_CONDITION(cn_cbor_array_append(pArray, pcborProtected2, NULL), COSE_ERR_CBOR);
CHECK_CONDITION(cn_cbor_array_append(pArray, pcborProtectedSign2, NULL), COSE_ERR_CBOR);
CHECK_CONDITION(cn_cbor_array_append(pArray, cn_cbor_data_create(NULL, 0, CBOR_CONTEXT_PARAM_COMMA NULL), NULL), COSE_ERR_CBOR);
CHECK_CONDITION(cn_cbor_array_append(pArray, pcborBody2, NULL), COSE_ERR_CBOR);
cbToSign = cn_cbor_encoder_write(RgbDontUse4, 0, sizeof(RgbDontUse4), 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), COSE_ERR_CBOR);
f = ECDSA_Sign(pSigner, pbToSign, cbToSign, perr);
COSE_FREE(pbToSign, context);
CN_CBOR_FREE(pArray, context);
return f;
}
bool COSE_Signer_SetKey(HCOSE_SIGNER h, const cn_cbor * pKey, cose_errback * perror)
{
COSE_SignerInfo * p;
if (!IsValidSignerHandle(h) || (pKey == NULL)) {
if (perror != NULL) perror->err = COSE_ERR_INVALID_PARAMETER;
return false;
}
p = (COSE_SignerInfo *)h;
p->m_pkey = pKey;
return true;
}
byte RgbDontUseSign[8 * 1024];
bool _COSE_Signer_validate(COSE_SignMessage * pSign, COSE_SignerInfo * pSigner, const byte * pbContent, size_t cbContent, const byte * pbProtected, size_t cbProtected, cose_errback * perr)
{
cn_cbor_errback cbor_error;
byte * pbAuthData = NULL;
int cbitKey = 0;
byte * pbKeyIn = NULL;
int alg;
const cn_cbor * cn = NULL;
byte * pbKey = pbKeyIn;
#ifdef USE_CBOR_CONTEXT
cn_cbor_context * context = NULL;
#endif
ssize_t cbAuthData;
cn_cbor * pAuthData = NULL;
cn_cbor * ptmp = NULL;
#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.uint;
}
// 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);
cn_cbor * cnSignature = _COSE_arrayget_int(&pSigner->m_message, INDEX_SIGNATURE);
CHECK_CONDITION((cnSignature != NULL) && (cnSignature->type == CN_CBOR_BYTES), COSE_ERR_INVALID_PARAMETER);
// 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("Signature", 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 = cn_cbor_data_create(pbProtected, (int) cbProtected, 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 = cn_cbor_data_create(cnProtected->v.bytes, (int)cnProtected->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 = cn_cbor_data_create(NULL, 0, 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 = cn_cbor_data_create(pbContent, (int) cbContent, 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);
cbAuthData = cn_cbor_encoder_write(RgbDontUseSign, 0, sizeof(RgbDontUseSign), 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 + 1, pAuthData) == cbAuthData), COSE_ERR_CBOR); // M00HACK
switch (alg) {
case COSE_Algorithm_ECDSA_SHA_256:
if (!ECDSA_Verify(pSigner, pbAuthData, cbAuthData, cnSignature->v.bytes, cnSignature->length, perr)) goto errorReturn;
break;
default:
FAIL_CONDITION(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)) {
memset(pbKey, 0xff, cbitKey / 8);
COSE_FREE(pbKey, context);
}
return true;
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;
}