bool AES_CBC_MAC_Create(COSE_MacMessage * pcose, int TSize, const byte * pbKey, size_t cbKey, const byte * pbAuthData, size_t cbAuthData, cose_errback * perr)
{
const EVP_CIPHER * pcipher = NULL;
EVP_CIPHER_CTX ctx;
int cbOut;
byte rgbIV[16] = { 0 };
byte * rgbOut = NULL;
bool f = false;
unsigned int i;
cn_cbor * cn = NULL;
#ifdef USE_CBOR_CONTEXT
cn_cbor_context * context = &pcose->m_message.m_allocContext;
#endif
rgbOut = COSE_CALLOC(16, 1, context);
CHECK_CONDITION(rgbOut != NULL, COSE_ERR_OUT_OF_MEMORY);
switch (cbKey*8) {
case 128:
pcipher = EVP_aes_128_cbc();
break;
case 256:
pcipher = EVP_aes_256_cbc();
break;
default:
FAIL_CONDITION(COSE_ERR_INVALID_PARAMETER);
}
// Setup and run the OpenSSL code
EVP_CIPHER_CTX_init(&ctx);
CHECK_CONDITION(EVP_EncryptInit_ex(&ctx, pcipher, NULL, pbKey, rgbIV), COSE_ERR_CRYPTO_FAIL);
for (i = 0; i < (unsigned int)cbAuthData / 16; i++) {
CHECK_CONDITION(EVP_EncryptUpdate(&ctx, rgbOut, &cbOut, pbAuthData + (i * 16), 16), COSE_ERR_CRYPTO_FAIL);
}
if (cbAuthData % 16 != 0) {
CHECK_CONDITION(EVP_EncryptUpdate(&ctx, rgbOut, &cbOut, pbAuthData + (i * 16), cbAuthData % 16), COSE_ERR_CRYPTO_FAIL);
CHECK_CONDITION(EVP_EncryptUpdate(&ctx, rgbOut, &cbOut, rgbIV, 16 - (cbAuthData % 16)), COSE_ERR_CRYPTO_FAIL);
}
cn = cn_cbor_data_create(rgbOut, TSize / 8, CBOR_CONTEXT_PARAM_COMMA NULL);
CHECK_CONDITION(cn != NULL, COSE_ERR_OUT_OF_MEMORY);
rgbOut = NULL;
CHECK_CONDITION(_COSE_array_replace(&pcose->m_message, cn, INDEX_MAC_TAG, CBOR_CONTEXT_PARAM_COMMA NULL), COSE_ERR_CBOR);
cn = NULL;
EVP_CIPHER_CTX_cleanup(&ctx);
return !f;
errorReturn:
if (rgbOut != NULL) COSE_FREE(rgbOut, context);
if (cn != NULL) CN_CBOR_FREE(cn, context);
EVP_CIPHER_CTX_cleanup(&ctx);
return false;
}
bool ECDSA_Sign(COSE * pSigner, int index, const cn_cbor * pKey, int cbitDigest, const byte * rgbToSign, size_t cbToSign, cose_errback * perr)
{
EC_KEY * eckey = NULL;
byte rgbDigest[EVP_MAX_MD_SIZE];
unsigned int cbDigest = sizeof(rgbDigest);
byte * pbSig = NULL;
const EVP_MD * digest;
#ifdef USE_CBOR_CONTEXT
cn_cbor_context * context = &pSigner->m_allocContext;
#endif
cn_cbor * p = NULL;
ECDSA_SIG * psig = NULL;
cn_cbor_errback cbor_error;
int cbR;
byte rgbSig[66];
int cb;
eckey = ECKey_From(pKey, &cbR, perr);
if (eckey == NULL) {
errorReturn:
if (p != NULL) CN_CBOR_FREE(p, context);
if (eckey != NULL) EC_KEY_free(eckey);
return false;
}
switch (cbitDigest) {
case 256: digest = EVP_sha256(); break;
case 512: digest = EVP_sha512(); break;
case 384: digest = EVP_sha384(); break;
default:
FAIL_CONDITION(COSE_ERR_INVALID_PARAMETER);
}
EVP_Digest(rgbToSign, cbToSign, rgbDigest, &cbDigest, digest, NULL);
psig = ECDSA_do_sign(rgbDigest, cbDigest, eckey);
CHECK_CONDITION(psig != NULL, COSE_ERR_CRYPTO_FAIL);
pbSig = COSE_CALLOC(cbR, 2, context);
CHECK_CONDITION(pbSig != NULL, COSE_ERR_OUT_OF_MEMORY);
cb = BN_bn2bin(psig->r, rgbSig);
CHECK_CONDITION(cb <= cbR, COSE_ERR_INVALID_PARAMETER);
memcpy(pbSig + cbR - cb, rgbSig, cb);
cb = BN_bn2bin(psig->s, rgbSig);
CHECK_CONDITION(cb <= cbR, COSE_ERR_INVALID_PARAMETER);
memcpy(pbSig + 2*cbR - cb, rgbSig, cb);
p = cn_cbor_data_create(pbSig, cbR*2, CBOR_CONTEXT_PARAM_COMMA &cbor_error);
CHECK_CONDITION_CBOR(p != NULL, cbor_error);
CHECK_CONDITION(_COSE_array_replace(pSigner, p, index, CBOR_CONTEXT_PARAM_COMMA NULL), COSE_ERR_CBOR);
return true;
}
bool ECDSA_Verify(COSE * pSigner, int index, const cn_cbor * pKey, int cbitDigest, const byte * rgbToSign, size_t cbToSign, cose_errback * perr)
{
mbedtls_ecp_keypair keypair;
mbedtls_mpi r;
mbedtls_mpi s;
mbedtls_md_type_t mdType;
const mbedtls_md_info_t *pmdInfo;
byte rgbDigest[MBEDTLS_MD_MAX_SIZE];
cn_cbor * pSig;
bool result = false;
mbedtls_ecp_keypair_init(&keypair);
mbedtls_mpi_init(&r);
mbedtls_mpi_init(&s);
if(!ECKey_From(pKey, &keypair, perr)) goto errorReturn;
switch(cbitDigest)
{
case 256:
mdType = MBEDTLS_MD_SHA256;
break;
case 384:
mdType = MBEDTLS_MD_SHA384;
break;
case 512:
mdType = MBEDTLS_MD_SHA512;
break;
default:
FAIL_CONDITION(COSE_ERR_INVALID_PARAMETER);
}
pmdInfo = mbedtls_md_info_from_type(mdType);
CHECK_CONDITION(pmdInfo != NULL, COSE_ERR_INVALID_PARAMETER);
CHECK_CONDITION(mbedtls_md(pmdInfo, rgbToSign, cbToSign, rgbDigest) == 0, COSE_ERR_INVALID_PARAMETER);
pSig = _COSE_arrayget_int(pSigner, index);
CHECK_CONDITION((pSig != NULL) && (pSig->type == CN_CBOR_BYTES), COSE_ERR_INVALID_PARAMETER);
CHECK_CONDITION(mbedtls_mpi_read_binary( &r, pSig->v.bytes, pSig->length / 2 ) == 0, COSE_ERR_OUT_OF_MEMORY);
CHECK_CONDITION(mbedtls_mpi_read_binary( &s, pSig->v.bytes + pSig->length / 2, pSig->length / 2 ) == 0, COSE_ERR_OUT_OF_MEMORY);
CHECK_CONDITION(mbedtls_ecdsa_verify(&keypair.grp, rgbDigest, mbedtls_md_get_size(pmdInfo), &keypair.Q, &r, &s) == 0, COSE_ERR_CRYPTO_FAIL);
result = true;
errorReturn:
mbedtls_mpi_free(&r);
mbedtls_mpi_free(&s);
mbedtls_ecp_keypair_free(&keypair);
return result;
}
bool AES_CBC_MAC_Validate(COSE_MacMessage * pcose, int TSize, const byte * pbKey, size_t cbKey, const byte * pbAuthData, size_t cbAuthData, cose_errback * perr)
{
const EVP_CIPHER * pcipher = NULL;
EVP_CIPHER_CTX ctx;
int cbOut;
byte rgbIV[16] = { 0 };
byte rgbTag[16] = { 0 };
bool f = false;
unsigned int i;
switch (cbKey*8) {
case 128:
pcipher = EVP_aes_128_cbc();
break;
case 256:
pcipher = EVP_aes_256_cbc();
break;
default:
FAIL_CONDITION(COSE_ERR_INVALID_PARAMETER);
}
// Setup and run the OpenSSL code
EVP_CIPHER_CTX_init(&ctx);
CHECK_CONDITION(EVP_EncryptInit_ex(&ctx, pcipher, NULL, pbKey, rgbIV), COSE_ERR_CRYPTO_FAIL);
TSize /= 8;
for (i = 0; i < (unsigned int) cbAuthData / 16; i++) {
CHECK_CONDITION(EVP_EncryptUpdate(&ctx, rgbTag, &cbOut, pbAuthData+(i*16), 16), COSE_ERR_CRYPTO_FAIL);
}
if (cbAuthData % 16 != 0) {
CHECK_CONDITION(EVP_EncryptUpdate(&ctx, rgbTag, &cbOut, pbAuthData + (i * 16), cbAuthData % 16), COSE_ERR_CRYPTO_FAIL);
CHECK_CONDITION(EVP_EncryptUpdate(&ctx, rgbTag, &cbOut, rgbIV, 16 - (cbAuthData % 16)), COSE_ERR_CRYPTO_FAIL);
}
cn_cbor * cn = _COSE_arrayget_int(&pcose->m_message, INDEX_MAC_TAG);
CHECK_CONDITION(cn != NULL, COSE_ERR_CBOR);
for (i = 0; i < (unsigned int)TSize; i++) f |= (cn->v.bytes[i] != rgbTag[i]);
EVP_CIPHER_CTX_cleanup(&ctx);
return !f;
errorReturn:
EVP_CIPHER_CTX_cleanup(&ctx);
return false;
}
bool ECDSA_Verify(COSE * pSigner, int index, const cn_cbor * pKey, int cbitDigest, const byte * rgbToSign, size_t cbToSign, cose_errback * perr)
{
EC_KEY * eckey = NULL;
byte rgbDigest[EVP_MAX_MD_SIZE];
unsigned int cbDigest = sizeof(rgbDigest);
const EVP_MD * digest;
#ifdef USE_CBOR_CONTEXT
cn_cbor_context * context = &pSigner->m_allocContext;
#endif
cn_cbor * p = NULL;
ECDSA_SIG sig = { NULL, NULL };
int cbR;
cn_cbor * pSig;
size_t cbSignature;
eckey = ECKey_From(pKey, &cbR, perr);
if (eckey == NULL) {
errorReturn:
if (sig.r != NULL) BN_free(sig.r);
if (sig.s != NULL) BN_free(sig.s);
if (p != NULL) CN_CBOR_FREE(p, context);
if (eckey != NULL) EC_KEY_free(eckey);
return false;
}
switch (cbitDigest) {
case 256: digest = EVP_sha256(); break;
case 512: digest = EVP_sha512(); break;
case 384: digest = EVP_sha384(); break;
default:
FAIL_CONDITION(COSE_ERR_INVALID_PARAMETER);
}
EVP_Digest(rgbToSign, cbToSign, rgbDigest, &cbDigest, digest, NULL);
pSig = _COSE_arrayget_int(pSigner, index);
CHECK_CONDITION(pSig != NULL, CN_CBOR_ERR_INVALID_PARAMETER);
cbSignature = pSig->length;
CHECK_CONDITION(cbSignature / 2 == cbR, COSE_ERR_INVALID_PARAMETER);
sig.r = BN_bin2bn(pSig->v.bytes,(int) cbSignature/2, NULL);
sig.s = BN_bin2bn(pSig->v.bytes+cbSignature/2, (int) cbSignature/2, NULL);
CHECK_CONDITION(ECDSA_do_verify(rgbDigest, cbDigest, &sig, eckey) == 1, COSE_ERR_CRYPTO_FAIL);
BN_free(sig.r);
BN_free(sig.s);
if (eckey != NULL) EC_KEY_free(eckey);
return true;
}
bool HMAC_Validate(COSE_MacMessage * pcose, int HSize, int TSize, const byte * pbKey, size_t cbKey, const byte * pbAuthData, size_t cbAuthData, cose_errback * perr)
{
mbedtls_md_context_t contx;
const char* md_name;
const struct mbedtls_md_info_t * info;
byte * rgbOut = NULL;
unsigned int cbOut;
bool f = false;
unsigned int i;
#ifdef USE_CBOR_CONTEXT
cn_cbor_context * context = &pcose->m_message.m_allocContext;
#endif
switch (HSize) {
case 256: md_name = "SHA256"; break;
case 384: md_name = "SHA384"; break;
case 512: md_name = "SHA512"; break;
default: FAIL_CONDITION(COSE_ERR_INVALID_PARAMETER); break;
}
mbedtls_md_init(&contx);
info = mbedtls_md_info_from_string (md_name);
mbedtls_md_setup( &contx, info, 1 );
cbOut = mbedtls_md_get_size(info);
rgbOut = COSE_CALLOC(cbOut, 1, context);
CHECK_CONDITION(rgbOut != NULL, COSE_ERR_OUT_OF_MEMORY);
CHECK_CONDITION(!(mbedtls_md_hmac_starts (&contx, (char*)pbKey, cbKey)), COSE_ERR_CRYPTO_FAIL);
CHECK_CONDITION(!(mbedtls_md_hmac_update (&contx, pbAuthData, cbAuthData)), COSE_ERR_CRYPTO_FAIL);
CHECK_CONDITION(!(mbedtls_md_hmac_finish (&contx, rgbOut)), COSE_ERR_CRYPTO_FAIL);
cn_cbor * cn = _COSE_arrayget_int(&pcose->m_message, INDEX_MAC_TAG);
CHECK_CONDITION(cn != NULL, COSE_ERR_CBOR);
if (cn->length > (int) cbOut) return false;
for (i = 0; i < (unsigned int) TSize/8; i++) f |= (cn->v.bytes[i] != rgbOut[i]);
mbedtls_md_free(&contx);
return !f;
errorReturn:
COSE_FREE(rgbOut, context);
mbedtls_md_free(&contx);
return false;
}
// We are doing CBC-MAC not CMAC at this time
bool AES_CMAC_Validate(COSE_MacMessage * pcose, int KeySize, int TagSize, const byte * pbAuthData, int cbAuthData, cose_errback * perr)
{
CMAC_CTX * pctx = NULL;
const EVP_CIPHER * pcipher = NULL;
byte * rgbOut = NULL;
size_t cbOut;
bool f = false;
unsigned int i;
#ifdef USE_CBOR_CONTEXT
cn_cbor_context * context = &pcose->m_message.m_allocContext;
#endif
pctx = CMAC_CTX_new();
switch (KeySize) {
case 128: pcipher = EVP_aes_128_cbc(); break;
case 256: pcipher = EVP_aes_256_cbc(); break;
default: FAIL_CONDITION(COSE_ERR_INVALID_PARAMETER); break;
}
rgbOut = COSE_CALLOC(128/8, 1, context);
CHECK_CONDITION(rgbOut != NULL, COSE_ERR_OUT_OF_MEMORY);
CHECK_CONDITION(CMAC_Init(pctx, pcose->pbKey, pcose->cbKey, pcipher, NULL /*impl*/) == 1, COSE_ERR_CRYPTO_FAIL);
CHECK_CONDITION(CMAC_Update(pctx, pbAuthData, cbAuthData), COSE_ERR_CRYPTO_FAIL);
CHECK_CONDITION(CMAC_Final(pctx, rgbOut, &cbOut), COSE_ERR_CRYPTO_FAIL);
cn_cbor * cn = _COSE_arrayget_int(&pcose->m_message, INDEX_MAC_TAG);
CHECK_CONDITION(cn != NULL, COSE_ERR_CBOR);
for (i = 0; i < (unsigned int)TagSize / 8; i++) f |= (cn->v.bytes[i] != rgbOut[i]);
COSE_FREE(rgbOut, context);
CMAC_CTX_cleanup(pctx);
CMAC_CTX_free(pctx);
return !f;
errorReturn:
COSE_FREE(rgbOut, context);
CMAC_CTX_cleanup(pctx);
CMAC_CTX_free(pctx);
return false;
}
bool HMAC_Validate(COSE_MacMessage * pcose, int HSize, int TSize, const byte * pbKey, size_t cbKey, const byte * pbAuthData, size_t cbAuthData, cose_errback * perr)
{
HMAC_CTX ctx;
const EVP_MD * pmd = NULL;
byte * rgbOut = NULL;
unsigned int cbOut;
bool f = false;
unsigned int i;
#ifdef USE_CBOR_CONTEXT
cn_cbor_context * context = &pcose->m_message.m_allocContext;
#endif
HMAC_CTX_init(&ctx);
switch (HSize) {
case 256: pmd = EVP_sha256(); break;
case 384: pmd = EVP_sha384(); break;
case 512: pmd = EVP_sha512(); break;
default: FAIL_CONDITION(COSE_ERR_INVALID_PARAMETER); break;
}
rgbOut = COSE_CALLOC(EVP_MAX_MD_SIZE, 1, context);
CHECK_CONDITION(rgbOut != NULL, COSE_ERR_OUT_OF_MEMORY);
CHECK_CONDITION(HMAC_Init(&ctx, pbKey, (int) cbKey, pmd), COSE_ERR_CRYPTO_FAIL);
CHECK_CONDITION(HMAC_Update(&ctx, pbAuthData, cbAuthData), COSE_ERR_CRYPTO_FAIL);
CHECK_CONDITION(HMAC_Final(&ctx, rgbOut, &cbOut), COSE_ERR_CRYPTO_FAIL);
cn_cbor * cn = _COSE_arrayget_int(&pcose->m_message, INDEX_MAC_TAG);
CHECK_CONDITION(cn != NULL, COSE_ERR_CBOR);
if (cn->length > (int) cbOut) return false;
for (i = 0; i < (unsigned int) TSize/8; i++) f |= (cn->v.bytes[i] != rgbOut[i]);
HMAC_cleanup(&ctx);
return !f;
errorReturn:
COSE_FREE(rgbOut, context);
HMAC_cleanup(&ctx);
return false;
}
bool _COSE_map_put(COSE * pCose, int key, cn_cbor * value, int flags, cose_errback * perr)
{
#ifdef USE_CBOR_CONTEXT
cn_cbor_context * context = &pCose->m_allocContext;
#endif
cn_cbor_errback error;
bool f;
if ((flags & COSE_BOTH) == COSE_BOTH) {
if (perr != NULL) perr->err = COSE_ERR_INVALID_PARAMETER;
errorReturn:
return false;
}
if (perr != NULL) perr->err = COSE_ERR_NONE;
switch (flags) {
case COSE_PROTECT_ONLY:
f = cn_cbor_mapput_int(pCose->m_protectedMap, key, value, CBOR_CONTEXT_PARAM_COMMA &error);
break;
case COSE_UNPROTECT_ONLY:
f = cn_cbor_mapput_int(pCose->m_unprotectMap, key, value, CBOR_CONTEXT_PARAM_COMMA &error);
break;
case COSE_DONT_SEND:
if (pCose->m_dontSendMap == NULL) {
pCose->m_dontSendMap = cn_cbor_map_create(CBOR_CONTEXT_PARAM_COMMA &error);
CHECK_CONDITION(pCose->m_dontSendMap != NULL, COSE_ERR_OUT_OF_MEMORY);
}
f = cn_cbor_mapput_int(pCose->m_dontSendMap, key, value, CBOR_CONTEXT_PARAM_COMMA &error);
break;
default:
FAIL_CONDITION(COSE_ERR_INVALID_PARAMETER);
break;
}
CHECK_CONDITION(f, _MapFromCBOR(error));
return f;
}
bool HMAC_Create(COSE_MacMessage * pcose, int HSize, int TSize, const byte * pbKey, size_t cbKey, const byte * pbAuthData, size_t cbAuthData, cose_errback * perr)
{
byte * rgbOut = NULL;
// unsigned int cbOut;
mbedtls_md_context_t contx;
const char* md_name;
const struct mbedtls_md_info_t * info;
#ifdef USE_CBOR_CONTEXT
cn_cbor_context * context = &pcose->m_message.m_allocContext;
#endif
switch (HSize) {
case 256: md_name = "SHA256"; break;
case 384: md_name = "SHA384"; break;
case 512: md_name = "SHA512"; break;
default: FAIL_CONDITION(COSE_ERR_INVALID_PARAMETER); break;
}
if (0) {
errorReturn:
COSE_FREE(rgbOut, context);
mbedtls_md_free(&contx);
return false;
}
mbedtls_md_init(&contx);
info = mbedtls_md_info_from_string (md_name);
mbedtls_md_setup( &contx, info, 1 );
rgbOut = COSE_CALLOC(mbedtls_md_get_size(info), 1, context);
CHECK_CONDITION(rgbOut != NULL, COSE_ERR_OUT_OF_MEMORY);
CHECK_CONDITION(!(mbedtls_md_hmac_starts (&contx, (char*)pbKey, cbKey)), COSE_ERR_CRYPTO_FAIL);
CHECK_CONDITION(!(mbedtls_md_hmac_update (&contx, pbAuthData, cbAuthData)), COSE_ERR_CRYPTO_FAIL);
CHECK_CONDITION(!(mbedtls_md_hmac_finish (&contx, rgbOut)), COSE_ERR_CRYPTO_FAIL);
CHECK_CONDITION(_COSE_array_replace(&pcose->m_message, cn_cbor_data_create(rgbOut, TSize / 8, CBOR_CONTEXT_PARAM_COMMA NULL), INDEX_MAC_TAG, CBOR_CONTEXT_PARAM_COMMA NULL), COSE_ERR_CBOR);
mbedtls_md_free(&contx);
return true;
}
bool HMAC_Create(COSE_MacMessage * pcose, int HSize, int TSize, const byte * pbKey, size_t cbKey, const byte * pbAuthData, size_t cbAuthData, cose_errback * perr)
{
HMAC_CTX ctx;
const EVP_MD * pmd = NULL;
byte * rgbOut = NULL;
unsigned int cbOut;
#ifdef USE_CBOR_CONTEXT
cn_cbor_context * context = &pcose->m_message.m_allocContext;
#endif
HMAC_CTX_init(&ctx);
if (0) {
errorReturn:
COSE_FREE(rgbOut, context);
HMAC_cleanup(&ctx);
return false;
}
switch (HSize) {
case 256: pmd = EVP_sha256(); break;
case 384: pmd = EVP_sha384(); break;
case 512: pmd = EVP_sha512(); break;
default: FAIL_CONDITION(COSE_ERR_INVALID_PARAMETER); break;
}
rgbOut = COSE_CALLOC(EVP_MAX_MD_SIZE, 1, context);
CHECK_CONDITION(rgbOut != NULL, COSE_ERR_OUT_OF_MEMORY);
CHECK_CONDITION(HMAC_Init(&ctx, pbKey, (int) cbKey, pmd), COSE_ERR_CRYPTO_FAIL);
CHECK_CONDITION(HMAC_Update(&ctx, pbAuthData, cbAuthData), COSE_ERR_CRYPTO_FAIL);
CHECK_CONDITION(HMAC_Final(&ctx, rgbOut, &cbOut), COSE_ERR_CRYPTO_FAIL);
CHECK_CONDITION(_COSE_array_replace(&pcose->m_message, cn_cbor_data_create(rgbOut, TSize / 8, CBOR_CONTEXT_PARAM_COMMA NULL), INDEX_MAC_TAG, CBOR_CONTEXT_PARAM_COMMA NULL), COSE_ERR_CBOR);
HMAC_cleanup(&ctx);
return true;
}
bool COSE_Mac0_validate(HCOSE_MAC0 h, const byte * pbKey, size_t cbKey, cose_errback * perr)
{
COSE_Mac0Message * pcose = (COSE_Mac0Message *)h;
cn_cbor_errback cbor_error;
byte * pbAuthData = NULL;
int cbitKey = 0;
int alg;
const cn_cbor * cn = NULL;
#ifdef USE_CBOR_CONTEXT
cn_cbor_context * context = NULL;
#endif
ssize_t cbAuthData;
cn_cbor * pAuthData = NULL;
cn_cbor * ptmp = NULL;
CHECK_CONDITION(IsValidMac0Handle(h), COSE_ERR_INVALID_PARAMETER);
#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) 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) {
case COSE_Algorithm_CBC_MAC_128_64:
case COSE_Algorithm_CBC_MAC_128_128:
cbitKey = 128;
break;
case COSE_Algorithm_CBC_MAC_256_64:
case COSE_Algorithm_CBC_MAC_256_128:
case COSE_Algorithm_HMAC_256_64:
case COSE_Algorithm_HMAC_256_256:
cbitKey = 256;
break;
case COSE_Algorithm_HMAC_384_384:
cbitKey = 384;
break;
case COSE_Algorithm_HMAC_512_512:
cbitKey = 512;
break;
default:
FAIL_CONDITION(COSE_ERR_UNKNOWN_ALGORITHM);
break;
}
}
// Build protected headers
cn_cbor * cnProtected = _COSE_arrayget_int(&pcose->m_message, INDEX_PROTECTED);
CHECK_CONDITION((cnProtected != NULL) && (cnProtected->type == CN_CBOR_BYTES), COSE_ERR_INVALID_PARAMETER);
cn_cbor * cnContent = _COSE_arrayget_int(&pcose->m_message, INDEX_BODY);
CHECK_CONDITION((cnContent != NULL) && (cnContent->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("MAC0", 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(cnContent->v.bytes, (int) cnContent->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);
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+1, pAuthData) == cbAuthData), COSE_ERR_CBOR); // M00HACK
switch (alg) {
case COSE_Algorithm_HMAC_256_256:
if (!HMAC_Validate((COSE_MacMessage *)pcose, 256, 256, pbKey, cbKey, pbAuthData, cbAuthData, perr)) goto errorReturn;
break;
case COSE_Algorithm_HMAC_256_64:
if (!HMAC_Validate((COSE_MacMessage *)pcose, 256, 64, pbKey, cbKey, pbAuthData, cbAuthData, perr)) goto errorReturn;
break;
case COSE_Algorithm_HMAC_384_384:
if (!HMAC_Validate((COSE_MacMessage *)pcose, 384, 384, pbKey, cbKey, pbAuthData, cbAuthData, perr)) goto errorReturn;
break;
case COSE_Algorithm_HMAC_512_512:
if (!HMAC_Validate((COSE_MacMessage *)pcose, 512, 512, pbKey, cbKey, pbAuthData, cbAuthData, perr)) goto errorReturn;
break;
case COSE_Algorithm_CBC_MAC_128_64:
case COSE_Algorithm_CBC_MAC_256_64:
if (!AES_CBC_MAC_Validate((COSE_MacMessage *)pcose, 64, pbKey, cbKey, pbAuthData, cbAuthData, perr)) goto errorReturn;
break;
case COSE_Algorithm_CBC_MAC_128_128:
case COSE_Algorithm_CBC_MAC_256_128:
if (!AES_CBC_MAC_Validate((COSE_MacMessage *)pcose, 128, pbKey, cbKey, pbAuthData, cbAuthData, 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);
return true;
errorReturn:
if (pbAuthData != NULL) COSE_FREE(pbAuthData, context);
if (pAuthData != NULL) cn_cbor_free(pAuthData CBOR_CONTEXT_PARAM);
return false;
}
bool COSE_Mac0_encrypt(HCOSE_MAC0 h, const byte * pbKey, size_t cbKey, cose_errback * perr)
{
int alg;
const cn_cbor * cn_Alg = NULL;
byte * pbAuthData = NULL;
cn_cbor * pAuthData = NULL;
cn_cbor * ptmp = NULL;
size_t cbitKey;
#ifdef USE_CBOR_CONTEXT
cn_cbor_context * context = NULL;
#endif
COSE_Mac0Message * pcose = (COSE_Mac0Message *)h;
cn_cbor_errback cbor_error;
CHECK_CONDITION(IsValidMac0Handle(h), COSE_ERR_INVALID_PARAMETER);
#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, perr);
if (cn_Alg == NULL) goto errorReturn;
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) {
case COSE_Algorithm_CBC_MAC_128_64:
case COSE_Algorithm_CBC_MAC_128_128:
cbitKey = 128;
break;
case COSE_Algorithm_CBC_MAC_256_64:
case COSE_Algorithm_CBC_MAC_256_128:
case COSE_Algorithm_HMAC_256_64:
case COSE_Algorithm_HMAC_256_256:
cbitKey = 256;
break;
case COSE_Algorithm_HMAC_384_384:
cbitKey = 384;
break;
case COSE_Algorithm_HMAC_512_512:
cbitKey = 512;
break;
default:
FAIL_CONDITION(COSE_ERR_INVALID_PARAMETER);
}
// Build protected headers
const cn_cbor * cbProtected = _COSE_encode_protected(&pcose->m_message, perr);
if (cbProtected == NULL) goto errorReturn;
// Get the body
const cn_cbor * cbBody = _COSE_arrayget_int(&pcose->m_message, INDEX_BODY);
CHECK_CONDITION(cbBody != NULL, COSE_ERR_INVALID_PARAMETER);
// Build authenticated data
// Protected headers
// external data
// body
size_t cbAuthData = 0;
pAuthData = cn_cbor_array_create(CBOR_CONTEXT_PARAM_COMMA NULL);
CHECK_CONDITION(pAuthData != NULL, COSE_ERR_OUT_OF_MEMORY);
ptmp = cn_cbor_string_create("MAC0", 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(cbProtected->v.bytes, (int) cbProtected->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;
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 = NULL;
ptmp = cn_cbor_data_create(cbBody->v.bytes, (int) cbBody->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;
cbAuthData = cn_cbor_encoder_write(RgbDontUse2, 0, sizeof(RgbDontUse2), 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);
switch (alg) {
case COSE_Algorithm_CBC_MAC_128_64:
case COSE_Algorithm_CBC_MAC_256_64:
if (!AES_CBC_MAC_Create((COSE_MacMessage *)pcose, 64, pbKey, cbKey, pbAuthData, cbAuthData, perr)) goto errorReturn;
break;
case COSE_Algorithm_CBC_MAC_128_128:
case COSE_Algorithm_CBC_MAC_256_128:
if (!AES_CBC_MAC_Create((COSE_MacMessage *)pcose, 128, pbKey, cbKey, pbAuthData, cbAuthData, perr)) goto errorReturn;
break;
case COSE_Algorithm_HMAC_256_64:
if (!HMAC_Create((COSE_MacMessage *)pcose, 256, 64, pbKey, cbKey, pbAuthData, cbAuthData, perr)) goto errorReturn;
break;
case COSE_Algorithm_HMAC_256_256:
if (!HMAC_Create((COSE_MacMessage *)pcose, 256, 256, pbKey, cbKey, pbAuthData, cbAuthData, perr)) goto errorReturn;
break;
case COSE_Algorithm_HMAC_384_384:
if (!HMAC_Create((COSE_MacMessage *)pcose, 384, 384, pbKey, cbKey, pbAuthData, cbAuthData, perr)) goto errorReturn;
break;
case COSE_Algorithm_HMAC_512_512:
if (!HMAC_Create((COSE_MacMessage *)pcose, 512, 512, pbKey, cbKey, pbAuthData, cbAuthData, perr)) goto errorReturn;
break;
default:
FAIL_CONDITION(COSE_ERR_INVALID_PARAMETER);
}
// Figure out the clean up
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 true;
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;
}
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 * 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;
}
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;
pbKey = _COSE_RecipientInfo_generateKey(pri, alg, cbitKey, perr);
cbKey = cbitKey / 8;
if (pbKey == NULL) goto errorReturn;
}
else {
t |= 2;
}
}
CHECK_CONDITION(t != 3, COSE_ERR_INVALID_PARAMETER);
if (t == 2) {
pbKey = (byte *)COSE_CALLOC(cbitKey / 8, 1, context);
CHECK_CONDITION(pbKey != NULL, COSE_ERR_OUT_OF_MEMORY);
cbKey = cbitKey / 8;
rand_bytes(pbKey, cbKey);
}
}
// 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);
}
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 (pbAuthData != NULL) COSE_FREE(pbAuthData, context);
if ((pbKey != NULL) && (pbKey != pbKeyIn)) {
memset(pbKey, 0, cbKey);
COSE_FREE(pbKey, context);
}
return fRet;
}
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 * 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 ((pbKey != NULL) && (pbKeyIn == NULL)) {
memset(pbKey, 0xff, cbitKey / 8);
COSE_FREE(pbKey, 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;
}
else {
// 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
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, pbKey, perr)) goto errorReturn;
break;
}
else if (pRecipX->m_encrypt.m_recipientFirst != NULL) {
if (_COSE_Recipient_decrypt(pRecipX, pRecip, alg, cbitKey, pbKey, 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, pbKey, perr)) break;
}
CHECK_CONDITION(pRecip != NULL, COSE_ERR_NO_RECIPIENT_FOUND);
}
}
// 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 ((pbKey != NULL) && (pbKeyIn == NULL)) COSE_FREE(pbKey, context);
if (perr != NULL) perr->err = COSE_ERR_NONE;
return true;
}
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;
cn_cbor_errback cbor_error;
byte * pbAuthData = NULL;
int cbitKey = 0;
int alg;
const cn_cbor * cn = NULL;
byte * pbKey = NULL;
#ifdef USE_CBOR_CONTEXT
cn_cbor_context * context = NULL;
#endif
ssize_t cbAuthData;
cn_cbor * pAuthData = NULL;
cn_cbor * ptmp = NULL;
CHECK_CONDITION(IsValidMacHandle(h) && IsValidRecipientHandle(hRecip), COSE_ERR_INVALID_PARAMETER);
#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) 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) {
case COSE_Algorithm_CBC_MAC_128_64:
case COSE_Algorithm_CBC_MAC_128_128:
cbitKey = 128;
break;
case COSE_Algorithm_CBC_MAC_256_64:
case COSE_Algorithm_CBC_MAC_256_128:
case COSE_Algorithm_HMAC_256_64:
case COSE_Algorithm_HMAC_256_256:
cbitKey = 256;
break;
case COSE_Algorithm_HMAC_384_384:
cbitKey = 384;
break;
case COSE_Algorithm_HMAC_512_512:
cbitKey = 512;
break;
default:
FAIL_CONDITION(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;
}
CHECK_CONDITION(pRecip != NULL, COSE_ERR_NO_RECIPIENT_FOUND);
// Build protected headers
cn_cbor * cnProtected = _COSE_arrayget_int(&pcose->m_message, INDEX_PROTECTED);
CHECK_CONDITION((cnProtected != NULL) && (cnProtected->type == CN_CBOR_BYTES), COSE_ERR_INVALID_PARAMETER);
cn_cbor * cnContent = _COSE_arrayget_int(&pcose->m_message, INDEX_BODY);
CHECK_CONDITION((cnContent != NULL) && (cnContent->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("MAC", 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(cnContent->v.bytes, (int) cnContent->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);
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+1, pAuthData) == cbAuthData), COSE_ERR_CBOR); // M00HACK
switch (alg) {
case COSE_Algorithm_HMAC_256_256:
if (!HMAC_Validate(pcose, 256, 256, pbKey, cbitKey/8, pbAuthData, cbAuthData, perr)) goto errorReturn;
break;
case COSE_Algorithm_HMAC_256_64:
if (!HMAC_Validate(pcose, 256, 64, pbKey, cbitKey/8, pbAuthData, cbAuthData, perr)) goto errorReturn;
break;
case COSE_Algorithm_HMAC_384_384:
if (!HMAC_Validate(pcose, 384, 384, pbKey, cbitKey/8, pbAuthData, cbAuthData, perr)) goto errorReturn;
break;
case COSE_Algorithm_HMAC_512_512:
if (!HMAC_Validate(pcose, 512, 512, pbKey, cbitKey/8, pbAuthData, cbAuthData, perr)) goto errorReturn;
break;
case COSE_Algorithm_CBC_MAC_128_64:
case COSE_Algorithm_CBC_MAC_256_64:
if (!AES_CBC_MAC_Validate(pcose, 64, pbKey, cbitKey/8, pbAuthData, cbAuthData, perr)) goto errorReturn;
break;
case COSE_Algorithm_CBC_MAC_128_128:
case COSE_Algorithm_CBC_MAC_256_128:
if (!AES_CBC_MAC_Validate(pcose, 128, pbKey, cbitKey/8, pbAuthData, cbAuthData, 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)) {
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)) {
memset(pbKey, 0xff, cbitKey / 8);
COSE_FREE(pbKey, context);
}
return false;
}
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 = NULL;
#endif // USE_CBOR_CONTEXT
COSE_RecipientInfo * pobj;
COSE_MacMessage * pcose = (COSE_MacMessage *)hcose;
cn_cbor * cn_Temp = NULL;
cn_cbor * pRecipients = NULL;
cn_cbor * pRecipientsNew = NULL;
byte * pbKey = NULL;
byte * pbTemp = NULL;
cn_cbor * cnTemp = NULL;
cn_cbor_errback cbor_error;
CHECK_CONDITION(IsValidMacHandle(hcose) && (rgbKey != NULL), COSE_ERR_INVALID_PARAMETER);
#ifdef USE_CBOR_CONTEXT
context = &pcose->m_message.m_allocContext;
#endif // USE_CBOR_CONTEXT
switch (alg) {
case COSE_Algorithm_Direct:
break;
default:
FAIL_CONDITION(COSE_ERR_INVALID_PARAMETER);
}
pobj = (COSE_RecipientInfo *)COSE_CALLOC(1, sizeof(COSE_RecipientInfo), context);
CHECK_CONDITION(pobj != NULL, COSE_ERR_OUT_OF_MEMORY);
if (!_COSE_Init(&pobj->m_encrypt.m_message, COSE_unknown_object, CBOR_CONTEXT_PARAM_COMMA perr)) {
goto errorReturn;
}
cn_Temp = cn_cbor_int_create(alg, CBOR_CONTEXT_PARAM_COMMA &cbor_error);
CHECK_CONDITION_CBOR(cn_Temp != NULL, cbor_error);
CHECK_CONDITION_CBOR(cn_cbor_mapput_int(pobj->m_encrypt.m_message.m_unprotectMap, COSE_Header_Algorithm, cn_Temp, CBOR_CONTEXT_PARAM_COMMA &cbor_error), cbor_error);
cn_Temp = NULL;
if (cbKid > 0) {
pbTemp = (byte *)COSE_CALLOC(cbKid, 1, context);
CHECK_CONDITION(pbTemp != NULL, COSE_ERR_OUT_OF_MEMORY);
memcpy(pbTemp, rgbKid, cbKid);
cnTemp = cn_cbor_data_create(pbTemp, cbKid, CBOR_CONTEXT_PARAM_COMMA &cbor_error);
CHECK_CONDITION_CBOR(cnTemp != NULL, cbor_error);
pbTemp = NULL;
CHECK_CONDITION_CBOR(cn_cbor_mapput_int(pobj->m_encrypt.m_message.m_unprotectMap, COSE_Header_KID, cnTemp, CBOR_CONTEXT_PARAM_COMMA &cbor_error), cbor_error);
}
pobj->m_encrypt.pbKey = pbKey = (byte *)COSE_CALLOC(cbKey, 1, context);
CHECK_CONDITION(pobj->m_encrypt.pbKey != NULL, COSE_ERR_OUT_OF_MEMORY);
memcpy(pbKey, rgbKey, cbKey);
pobj->m_encrypt.cbKey = cbKey;
pobj->m_recipientNext = pcose->m_recipientFirst;
pcose->m_recipientFirst = pobj;
pRecipients = _COSE_arrayget_int(&pcose->m_message, INDEX_MAC_RECIPIENTS);
if (pRecipients == NULL) {
pRecipients = pRecipientsNew = cn_cbor_array_create(CBOR_CONTEXT_PARAM_COMMA &cbor_error);
CHECK_CONDITION_CBOR(pRecipients != NULL, cbor_error);
pRecipientsNew = NULL;
CHECK_CONDITION_CBOR(_COSE_array_replace(&pcose->m_message, pRecipients, INDEX_MAC_RECIPIENTS, CBOR_CONTEXT_PARAM_COMMA &cbor_error), cbor_error);
}
CHECK_CONDITION_CBOR(cn_cbor_array_append(pRecipients, pobj->m_encrypt.m_message.m_cbor, &cbor_error), cbor_error);
pobj->m_encrypt.m_message.m_flags |= 1;
return (HCOSE_RECIPIENT)pobj;
errorReturn:
if (cn_Temp != NULL) CN_CBOR_FREE(cn_Temp, context);
if (pRecipientsNew != NULL) CN_CBOR_FREE(pRecipientsNew, context);
// if (pobj != NULL) COSE_Recipient_Free(pobj);
return NULL;
}
bool ECDSA_Sign(COSE * pSigner, int index, const cn_cbor * pKey, int cbitDigest, const byte * rgbToSign, size_t cbToSign, cose_errback * perr)
{
#if defined(MBEDTLS_ECDSA_DETERMINISTIC)
byte rgbDigest[MBEDTLS_MD_MAX_SIZE];
uint8_t * pbSig = NULL;
cn_cbor_errback cbor_error;
int cbR;
mbedtls_md_type_t mdType;
const mbedtls_md_info_t *pmdInfo;
mbedtls_ecp_keypair keypair;
mbedtls_mpi r;
mbedtls_mpi s;
#ifdef USE_CBOR_CONTEXT
cn_cbor_context * context = &pSigner->m_allocContext;
#endif
cn_cbor * p = NULL;
bool result = false;
mbedtls_ecp_keypair_init(&keypair);
mbedtls_mpi_init(&r);
mbedtls_mpi_init(&s);
if(!ECKey_From(pKey, &keypair, perr)) goto errorReturn;
CHECK_CONDITION(keypair.d.n != 0, COSE_ERR_INVALID_PARAMETER);
switch(cbitDigest)
{
case 256:
mdType = MBEDTLS_MD_SHA256;
break;
case 384:
mdType = MBEDTLS_MD_SHA384;
break;
case 512:
mdType = MBEDTLS_MD_SHA512;
break;
default:
FAIL_CONDITION(COSE_ERR_INVALID_PARAMETER);
}
pmdInfo = mbedtls_md_info_from_type(mdType);
CHECK_CONDITION(pmdInfo != NULL, COSE_ERR_INVALID_PARAMETER);
CHECK_CONDITION(mbedtls_md(pmdInfo, rgbToSign, cbToSign, rgbDigest) == 0, COSE_ERR_INVALID_PARAMETER);
CHECK_CONDITION(mbedtls_ecdsa_sign_det(&keypair.grp, &r, &s, &keypair.d, rgbDigest, mbedtls_md_get_size(pmdInfo), mdType) == 0, COSE_ERR_CRYPTO_FAIL);
cbR = (keypair.grp.nbits + 7) / 8;
pbSig = COSE_CALLOC(cbR, 2, context);
CHECK_CONDITION(pbSig != NULL, COSE_ERR_OUT_OF_MEMORY);
CHECK_CONDITION(mbedtls_mpi_write_binary(&r, pbSig, cbR) == 0, COSE_ERR_INTERNAL);
CHECK_CONDITION(mbedtls_mpi_write_binary(&s, pbSig + cbR, cbR) == 0, COSE_ERR_INTERNAL);
p = cn_cbor_data_create(pbSig, cbR*2, CBOR_CONTEXT_PARAM_COMMA &cbor_error);
CHECK_CONDITION_CBOR(p != NULL, cbor_error);
CHECK_CONDITION(_COSE_array_replace(pSigner, p, index, CBOR_CONTEXT_PARAM_COMMA NULL), COSE_ERR_CBOR);
p = NULL;
pbSig = NULL;
result = true;
errorReturn:
cn_cbor_free(p CBOR_CONTEXT_PARAM);
COSE_FREE(pbSig, context);
mbedtls_mpi_free(&r);
mbedtls_mpi_free(&s);
mbedtls_ecp_keypair_free(&keypair);
return result;
#else
return false;
#endif
}
bool ECKey_From(const cn_cbor * pKey, mbedtls_ecp_keypair *keypair, cose_errback * perr)
{
byte rgbKey[MBEDTLS_ECP_MAX_PT_LEN];
int cbKey;
int cbGroup;
const cn_cbor * p;
mbedtls_ecp_group_id groupId;
p = cn_cbor_mapget_int(pKey, COSE_Key_Type);
CHECK_CONDITION(p != NULL, COSE_ERR_INVALID_PARAMETER);
if(p->type == CN_CBOR_UINT) {
CHECK_CONDITION(p->v.uint == COSE_Key_Type_EC2, COSE_ERR_INVALID_PARAMETER);
}
else {
FAIL_CONDITION(COSE_ERR_INVALID_PARAMETER);
}
p = cn_cbor_mapget_int(pKey, COSE_Key_EC_Curve);
CHECK_CONDITION((p != NULL) && (p->type == CN_CBOR_UINT), COSE_ERR_INVALID_PARAMETER);
switch (p->v.uint) {
case 1: // P-256
groupId = MBEDTLS_ECP_DP_SECP256R1;
break;
case 2: // P-384
groupId = MBEDTLS_ECP_DP_SECP384R1;
break;
case 3: // P-521
groupId = MBEDTLS_ECP_DP_SECP521R1;
break;
default:
FAIL_CONDITION(COSE_ERR_INVALID_PARAMETER);
}
CHECK_CONDITION(mbedtls_ecp_group_load(&keypair->grp, groupId) == 0, COSE_ERR_INVALID_PARAMETER);
cbGroup = (keypair->grp.nbits + 7) / 8;
p = cn_cbor_mapget_int(pKey, COSE_Key_EC_X);
CHECK_CONDITION((p != NULL) && (p->type == CN_CBOR_BYTES), COSE_ERR_INVALID_PARAMETER);
CHECK_CONDITION(p->length == cbGroup, COSE_ERR_INVALID_PARAMETER);
memcpy(rgbKey+1, p->v.str, p->length);
p = cn_cbor_mapget_int(pKey, COSE_Key_EC_Y);
CHECK_CONDITION((p != NULL), COSE_ERR_INVALID_PARAMETER);
if (p->type == CN_CBOR_BYTES) {
rgbKey[0] = 0x04;
cbKey = cbGroup * 2 + 1;
CHECK_CONDITION(p->length == cbGroup, COSE_ERR_INVALID_PARAMETER);
memcpy(rgbKey + p->length + 1, p->v.str, p->length);
}
else if (p->type == CN_CBOR_TRUE) {
cbKey = cbGroup + 1;
rgbKey[0] = 0x03;
}
else if (p->type == CN_CBOR_FALSE) {
cbKey = cbGroup + 1;
rgbKey[0] = 0x02;
}
else FAIL_CONDITION(COSE_ERR_INVALID_PARAMETER);
CHECK_CONDITION(mbedtls_ecp_point_read_binary(&keypair->grp, &keypair->Q, rgbKey, cbKey) == 0, COSE_ERR_INVALID_PARAMETER);
p = cn_cbor_mapget_int(pKey, COSE_Key_EC_d);
if (p != NULL) {
CHECK_CONDITION(p->type == CN_CBOR_BYTES, COSE_ERR_INVALID_PARAMETER);
CHECK_CONDITION(mbedtls_mpi_read_binary( &keypair->d, p->v.bytes, p->length) == 0, COSE_ERR_CRYPTO_FAIL);
}
return true;
errorReturn:
return false;
}
EC_KEY * ECKey_From(const cn_cbor * pKey, int * cbGroup, cose_errback * perr)
{
EC_KEY * pNewKey = EC_KEY_new();
byte rgbKey[512+1];
const cn_cbor * p;
int nidGroup = -1;
EC_POINT * pPoint = NULL;
p = cn_cbor_mapget_int(pKey, COSE_Key_EC_Curve);
CHECK_CONDITION(p != NULL, COSE_ERR_INVALID_PARAMETER);
switch (p->v.sint) {
case 1: // P-256
nidGroup = NID_X9_62_prime256v1;
*cbGroup = 256 / 8;
break;
case 2: // P-384
nidGroup = NID_secp384r1;
*cbGroup = 384 / 8;
break;
case 3: // P-521
nidGroup = NID_secp521r1;
*cbGroup = (521 + 7) / 8;
break;
default:
FAIL_CONDITION(COSE_ERR_INVALID_PARAMETER);
}
EC_GROUP * ecgroup = EC_GROUP_new_by_curve_name(nidGroup);
EC_KEY_set_group(pNewKey, ecgroup);
rgbKey[0] = POINT_CONVERSION_UNCOMPRESSED;
p = cn_cbor_mapget_int(pKey, COSE_Key_EC_X);
if (p == NULL) return NULL;
if (p->type != CN_CBOR_BYTES) return NULL;
memcpy(rgbKey+1, p->v.str, p->length);
p = cn_cbor_mapget_int(pKey, COSE_Key_EC_Y);
if (p == NULL) return NULL;
if (p->type != CN_CBOR_BYTES) return NULL;
memcpy(rgbKey + p->length+1, p->v.str, p->length);
pPoint = EC_POINT_new(ecgroup);
EC_POINT_oct2point(ecgroup, pPoint, rgbKey, p->length * 2 + 1, NULL);
EC_KEY_set_public_key(pNewKey, pPoint);
p = cn_cbor_mapget_int(pKey, COSE_Key_EC_d);
if (p != NULL) {
BIGNUM * pbn;
pbn = BN_bin2bn(p->v.bytes, (int) p->length, NULL);
EC_KEY_set_private_key(pNewKey, pbn);
}
return pNewKey;
errorReturn:
return NULL;
}
bool _COSE_Encrypt_decrypt(COSE_Encrypt * pcose, const byte * pbKey, size_t cbKey, cose_errback * perr)
{
int alg;
const cn_cbor * cn = NULL;
int cbitKey;
#ifdef USE_CBOR_CONTEXT
cn_cbor_context * context;
#endif
byte * pbAuthData = NULL;
size_t cbAuthData;
cn_cbor * pAuthData = NULL;
byte * pbProtected = NULL;
ssize_t cbProtected;
#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 (pbProtected != NULL) COSE_FREE(pbProtected, context);
if (pbAuthData != NULL) COSE_FREE(pbAuthData, context);
if (pAuthData != NULL) cn_cbor_free(pAuthData CBOR_CONTEXT_PARAM);
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 INCLUDE_AES_CCM
case COSE_Algorithm_AES_CCM_16_64_128:
case COSE_Algorithm_AES_CCM_16_128_128:
case COSE_Algorithm_AES_CCM_64_64_128:
case COSE_Algorithm_AES_CCM_64_128_128:
cbitKey = 128;
break;
case COSE_Algorithm_AES_CCM_64_64_256:
case COSE_Algorithm_AES_CCM_16_128_256:
case COSE_Algorithm_AES_CCM_64_128_256:
case COSE_Algorithm_AES_CCM_16_64_256:
cbitKey = 256;
break;
#endif // INCLUDE_AES_CCM
case COSE_Algorithm_AES_GCM_128:
cbitKey = 128;
break;
case COSE_Algorithm_AES_GCM_192:
cbitKey = 192;
break;
case COSE_Algorithm_AES_GCM_256:
cbitKey = 256;
break;
default:
FAIL_CONDITION(COSE_ERR_UNKNOWN_ALGORITHM);
break;
}
CHECK_CONDITION(cbitKey / 8 == cbKey, COSE_ERR_INVALID_PARAMETER);
// Build protected headers
CHECK_CONDITION(pcose->m_message.m_protectedMap != NULL, COSE_ERR_INVALID_PARAMETER);
if ((pcose->m_message.m_protectedMap != NULL) && (pcose->m_message.m_protectedMap->first_child != NULL)) {
cbProtected = cn_cbor_encoder_write(RgbDontUse, 0, sizeof(RgbDontUse), pcose->m_message.m_protectedMap);
pbProtected = (byte *)COSE_CALLOC(cbProtected, 1, context);
if (pbProtected == NULL) goto error;
if (cn_cbor_encoder_write(pbProtected, 0, cbProtected, pcose->m_message.m_protectedMap) != cbProtected) goto error;
}
else {
pbProtected = NULL;
cbProtected = 0;
}
// Build authenticated data
if (!_COSE_Encrypt_Build_AAD(&pcose->m_message, &pbAuthData, &cbAuthData, "Encrypted", perr)) goto errorReturn;
cn = _COSE_arrayget_int(&pcose->m_message, INDEX_BODY);
CHECK_CONDITION(cn != NULL, COSE_ERR_INVALID_PARAMETER);
switch (alg) {
#ifdef INCLUDE_AES_CCM
case COSE_Algorithm_AES_CCM_16_64_128:
case COSE_Algorithm_AES_CCM_16_64_256:
if (!AES_CCM_Decrypt((COSE_Enveloped *)pcose, 64, 16, pbKey, cbitKey / 8, cn->v.bytes, cn->length, pbAuthData, cbAuthData, perr)) goto error;
break;
case COSE_Algorithm_AES_CCM_16_128_128:
case COSE_Algorithm_AES_CCM_16_128_256:
if (!AES_CCM_Decrypt((COSE_Enveloped *)pcose, 128, 16, pbKey, cbitKey / 8, cn->v.bytes, cn->length, pbAuthData, cbAuthData, perr)) goto error;
break;
case COSE_Algorithm_AES_CCM_64_64_128:
case COSE_Algorithm_AES_CCM_64_64_256:
if (!AES_CCM_Decrypt((COSE_Enveloped *)pcose, 64, 64, pbKey, cbitKey / 8, cn->v.bytes, cn->length, pbAuthData, cbAuthData, perr)) goto error;
break;
case COSE_Algorithm_AES_CCM_64_128_128:
case COSE_Algorithm_AES_CCM_64_128_256:
if (!AES_CCM_Decrypt((COSE_Enveloped *)pcose, 128, 64, pbKey, cbitKey / 8, cn->v.bytes, cn->length, pbAuthData, cbAuthData, perr)) goto error;
break;
#endif // INCLUDE_AES_CCM
case COSE_Algorithm_AES_GCM_128:
case COSE_Algorithm_AES_GCM_192:
case COSE_Algorithm_AES_GCM_256:
if (!AES_GCM_Decrypt((COSE_Enveloped *)pcose, pbKey, cbitKey / 8, cn->v.bytes, cn->length, pbAuthData, cbAuthData, perr)) goto error;
break;
default:
FAIL_CONDITION(COSE_ERR_UNKNOWN_ALGORITHM);
break;
}
if (pbProtected != NULL) COSE_FREE(pbProtected, context);
if (pbAuthData != NULL) COSE_FREE(pbAuthData, context);
if (pAuthData != NULL) cn_cbor_free(pAuthData CBOR_CONTEXT_PARAM);
if (perr != NULL) perr->err = COSE_ERR_NONE;
return true;
}
HCOSE COSE_Decode(const byte * rgbData, size_t cbData, int * ptype, COSE_object_type struct_type, CBOR_CONTEXT_COMMA cose_errback * perr)
{
cn_cbor * cbor = NULL;
cn_cbor * cborRoot = NULL;
#ifdef TAG_IN_ARRAY
const cn_cbor * pType = NULL;
#endif
cn_cbor_errback cbor_err;
HCOSE h;
CHECK_CONDITION((rgbData != NULL) && (ptype != NULL), COSE_ERR_INVALID_PARAMETER);
cbor = cborRoot = cn_cbor_decode(rgbData, cbData, CBOR_CONTEXT_PARAM_COMMA &cbor_err);
CHECK_CONDITION_CBOR(cbor != NULL, cbor_err);
#ifdef TAG_IN_ARRAY
CHECK_CONDITION(cbor->type == CN_CBOR_ARRAY, COSE_ERR_INVALID_PARAMETER);
pType = cn_cbor_index(cbor, 0);
CHECK_CONDITION(((pType != NULL) && (pType->type == CN_CBOR_UINT)), COSE_ERR_INVALID_PARAMETER);
*ptype = pType->v.sint;
#else // ! TAG_IN_ARRAY
if (cbor->type == CN_CBOR_TAG) {
if (struct_type != 0) {
CHECK_CONDITION(struct_type == (COSE_object_type) cbor->v.sint, COSE_ERR_INVALID_PARAMETER);
}
else struct_type = cbor->v.uint;
*ptype = struct_type;
cbor = cbor->first_child;
}
else {
*ptype = struct_type;
}
CHECK_CONDITION(cbor->type == CN_CBOR_ARRAY, COSE_ERR_INVALID_PARAMETER);
#endif // TAG_IN_ARRAY
switch (*ptype) {
case COSE_enveloped_object:
h = (HCOSE)_COSE_Enveloped_Init_From_Object(cbor, NULL, CBOR_CONTEXT_PARAM_COMMA perr);
if (h == NULL) {
goto errorReturn;
}
break;
case COSE_sign_object:
h = (HCOSE)_COSE_Sign_Init_From_Object(cborRoot, NULL, CBOR_CONTEXT_PARAM_COMMA perr);
if (h == NULL) {
goto errorReturn;
}
break;
case COSE_sign0_object:
h = (HCOSE)_COSE_Sign0_Init_From_Object(cborRoot, NULL, CBOR_CONTEXT_PARAM_COMMA perr);
if (h == NULL) {
goto errorReturn;
}
break;
case COSE_mac_object:
h = (HCOSE)_COSE_Mac_Init_From_Object(cbor, NULL, CBOR_CONTEXT_PARAM_COMMA perr);
if (h == NULL) {
goto errorReturn;
}
break;
case COSE_mac0_object:
h = (HCOSE)_COSE_Mac0_Init_From_Object(cbor, NULL, CBOR_CONTEXT_PARAM_COMMA perr);
if (h == NULL) {
goto errorReturn;
}
break;
case COSE_encrypt_object:
h = (HCOSE)_COSE_Encrypt_Init_From_Object(cbor, NULL, CBOR_CONTEXT_PARAM_COMMA perr);
if (h == NULL) {
goto errorReturn;
}
break;
default:
FAIL_CONDITION(COSE_ERR_INVALID_PARAMETER);
}
return h;
errorReturn:
COSE_FREE(cbor, context);
return NULL;
}
bool AES_CCM_Encrypt(COSE_Enveloped * pcose, int TSize, int LSize, const byte * pbKey, size_t cbKey, const byte * pbAuthData, size_t cbAuthData, cose_errback * perr)
{
EVP_CIPHER_CTX ctx;
int cbOut;
byte * rgbOut = NULL;
int NSize = 15 - (LSize/8);
int outl = 0;
const cn_cbor * cbor_iv = NULL;
cn_cbor * cbor_iv_t = NULL;
#ifdef USE_CBOR_CONTEXT
cn_cbor_context * context = &pcose->m_message.m_allocContext;
#endif
cn_cbor * cnTmp = NULL;
const EVP_CIPHER * cipher;
byte rgbIV[16];
byte * pbIV = NULL;
cn_cbor_errback cbor_error;
switch (cbKey*8) {
case 128:
cipher = EVP_aes_128_ccm();
break;
case 192:
cipher = EVP_aes_192_ccm();
break;
case 256:
cipher = EVP_aes_256_ccm();
break;
default:
FAIL_CONDITION(COSE_ERR_INVALID_PARAMETER);
}
// Setup the IV/Nonce and put it into the message
cbor_iv = _COSE_map_get_int(&pcose->m_message, COSE_Header_IV, COSE_BOTH, perr);
if (cbor_iv == NULL) {
pbIV = COSE_CALLOC(NSize, 1, context);
CHECK_CONDITION(pbIV != NULL, COSE_ERR_OUT_OF_MEMORY);
rand_bytes(pbIV, NSize);
memcpy(rgbIV, pbIV, NSize);
cbor_iv_t = cn_cbor_data_create(pbIV, NSize, CBOR_CONTEXT_PARAM_COMMA &cbor_error);
CHECK_CONDITION_CBOR(cbor_iv_t != NULL, cbor_error);
pbIV = NULL;
if (!_COSE_map_put(&pcose->m_message, COSE_Header_IV, cbor_iv_t, COSE_UNPROTECT_ONLY, perr)) goto errorReturn;
cbor_iv_t = NULL;
}
else {
CHECK_CONDITION(cbor_iv->type == CN_CBOR_BYTES, COSE_ERR_INVALID_PARAMETER);
CHECK_CONDITION(cbor_iv->length == NSize, COSE_ERR_INVALID_PARAMETER);
memcpy(rgbIV, cbor_iv->v.str, cbor_iv->length);
}
// Setup and run the OpenSSL code
EVP_CIPHER_CTX_init(&ctx);
CHECK_CONDITION(EVP_EncryptInit_ex(&ctx, cipher, NULL, NULL, NULL), COSE_ERR_CRYPTO_FAIL);
TSize /= 8; // Comes in in bits not bytes.
CHECK_CONDITION(EVP_CIPHER_CTX_ctrl(&ctx, EVP_CTRL_CCM_SET_L, (LSize/8), 0), COSE_ERR_CRYPTO_FAIL);
// CHECK_CONDITION(EVP_CIPHER_CTX_ctrl(&ctx, EVP_CTRL_CCM_SET_IVLEN, NSize, 0), COSE_ERR_CRYPTO_FAIL);
CHECK_CONDITION(EVP_CIPHER_CTX_ctrl(&ctx, EVP_CTRL_CCM_SET_TAG, TSize, NULL), COSE_ERR_CRYPTO_FAIL); // Say we are doing an 8 byte tag
CHECK_CONDITION(EVP_EncryptInit(&ctx, 0, pbKey, rgbIV), COSE_ERR_CRYPTO_FAIL);
CHECK_CONDITION(EVP_EncryptUpdate(&ctx, 0, &cbOut, 0, (int) pcose->cbContent), COSE_ERR_CRYPTO_FAIL);
CHECK_CONDITION(EVP_EncryptUpdate(&ctx, NULL, &outl, pbAuthData, (int) cbAuthData), COSE_ERR_CRYPTO_FAIL);
rgbOut = (byte *)COSE_CALLOC(cbOut+TSize, 1, context);
CHECK_CONDITION(rgbOut != NULL, COSE_ERR_OUT_OF_MEMORY);
CHECK_CONDITION(EVP_EncryptUpdate(&ctx, rgbOut, &cbOut, pcose->pbContent, (int) pcose->cbContent), COSE_ERR_CRYPTO_FAIL);
CHECK_CONDITION(EVP_EncryptFinal_ex(&ctx, &rgbOut[cbOut], &cbOut), COSE_ERR_CRYPTO_FAIL);
CHECK_CONDITION(EVP_CIPHER_CTX_ctrl(&ctx, EVP_CTRL_CCM_GET_TAG, TSize, &rgbOut[pcose->cbContent]), COSE_ERR_CRYPTO_FAIL);
cnTmp = cn_cbor_data_create(rgbOut, (int)pcose->cbContent + TSize, CBOR_CONTEXT_PARAM_COMMA NULL);
CHECK_CONDITION(cnTmp != NULL, COSE_ERR_CBOR);
rgbOut = NULL;
CHECK_CONDITION(_COSE_array_replace(&pcose->m_message, cnTmp, INDEX_BODY, CBOR_CONTEXT_PARAM_COMMA NULL), COSE_ERR_CBOR);
cnTmp = NULL;
EVP_CIPHER_CTX_cleanup(&ctx);
return true;
errorReturn:
if (pbIV != NULL) COSE_FREE(pbIV, context);
if (cbor_iv_t != NULL) COSE_FREE(cbor_iv_t, context);
if (rgbOut != NULL) COSE_FREE(rgbOut, context);
if (cnTmp != NULL) COSE_FREE(cnTmp, context);
EVP_CIPHER_CTX_cleanup(&ctx);
return false;
}
bool COSE_Encrypt_encrypt(HCOSE_ENCRYPT h, const byte * pbKey, size_t cbKey, cose_errback * perr)
{
int alg;
const cn_cbor * cn_Alg = NULL;
byte * pbAuthData = NULL;
cn_cbor * pAuthData = NULL;
cn_cbor * ptmp = NULL;
size_t cbitKey;
#ifdef USE_CBOR_CONTEXT
cn_cbor_context * context = NULL;
#endif
COSE_Encrypt * pcose = (COSE_Encrypt *) h;
CHECK_CONDITION(IsValidEncryptHandle(h), COSE_ERR_INVALID_PARAMETER);
#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, perr);
if (cn_Alg == NULL) goto errorReturn;
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 INCLUDE_AES_CCM
case COSE_Algorithm_AES_CCM_64_64_128:
case COSE_Algorithm_AES_CCM_16_128_128:
case COSE_Algorithm_AES_CCM_64_128_128:
case COSE_Algorithm_AES_CCM_16_64_128:
cbitKey = 128;
break;
case COSE_Algorithm_AES_CCM_64_64_256:
case COSE_Algorithm_AES_CCM_16_128_256:
case COSE_Algorithm_AES_CCM_64_128_256:
case COSE_Algorithm_AES_CCM_16_64_256:
cbitKey = 256;
break;
#endif // INCLUDE_AES_CCM
case COSE_Algorithm_AES_GCM_128: cbitKey = 128; break;
case COSE_Algorithm_AES_GCM_192: cbitKey = 192; break;
case COSE_Algorithm_AES_GCM_256: cbitKey = 256; break;
default:
FAIL_CONDITION(COSE_ERR_INVALID_PARAMETER);
}
// Build protected headers
const cn_cbor * cbProtected = _COSE_encode_protected(&pcose->m_message, perr);
if (cbProtected == NULL) goto errorReturn;
// Build authenticated data
size_t cbAuthData = 0;
if (!_COSE_Encrypt_Build_AAD(&pcose->m_message, &pbAuthData, &cbAuthData, "Encrypted", perr)) goto errorReturn;
switch (alg) {
#ifdef INCLUDE_AES_CCM
case COSE_Algorithm_AES_CCM_16_64_128:
case COSE_Algorithm_AES_CCM_16_64_256:
if (!AES_CCM_Encrypt((COSE_Enveloped *)pcose, 64, 16, pbKey, cbKey, pbAuthData, cbAuthData, perr)) goto errorReturn;
break;
case COSE_Algorithm_AES_CCM_16_128_128:
case COSE_Algorithm_AES_CCM_16_128_256:
if (!AES_CCM_Encrypt((COSE_Enveloped *)pcose, 128, 16, pbKey, cbKey, pbAuthData, cbAuthData, perr)) goto errorReturn;
break;
case COSE_Algorithm_AES_CCM_64_64_128:
case COSE_Algorithm_AES_CCM_64_64_256:
if (!AES_CCM_Encrypt((COSE_Enveloped *)pcose, 64, 64, pbKey, cbKey, pbAuthData, cbAuthData, perr)) goto errorReturn;
break;
case COSE_Algorithm_AES_CCM_64_128_128:
case COSE_Algorithm_AES_CCM_64_128_256:
if (!AES_CCM_Encrypt((COSE_Enveloped *)pcose, 128, 64, pbKey, cbKey, pbAuthData, cbAuthData, perr)) goto errorReturn;
break;
#endif
case COSE_Algorithm_AES_GCM_128:
case COSE_Algorithm_AES_GCM_192:
case COSE_Algorithm_AES_GCM_256:
if (!AES_GCM_Encrypt((COSE_Enveloped *)pcose, pbKey, cbKey, pbAuthData, cbAuthData, perr)) goto errorReturn;
break;
default:
FAIL_CONDITION(COSE_ERR_INVALID_PARAMETER);
}
// Figure out the clean up
if (pbAuthData != NULL) COSE_FREE(pbAuthData, context);
if (pAuthData != NULL) cn_cbor_free(pAuthData CBOR_CONTEXT_PARAM);
return true;
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;
}
bool AES_GCM_Decrypt(COSE_Enveloped * pcose, const byte * pbKey, int cbKey, const byte * pbCrypto, size_t cbCrypto, const byte * pbAuthData, size_t cbAuthData, cose_errback * perr)
{
EVP_CIPHER_CTX ctx;
int cbOut;
byte * rgbOut = NULL;
int outl = 0;
byte rgbIV[15] = { 0 };
const cn_cbor * pIV = NULL;
const EVP_CIPHER * cipher;
#ifdef USE_CBOR_CONTEXT
cn_cbor_context * context = &pcose->m_message.m_allocContext;
#endif
int TSize = 128 / 8;
assert(perr != NULL);
EVP_CIPHER_CTX_init(&ctx);
// Setup the IV/Nonce and put it into the message
pIV = _COSE_map_get_int(&pcose->m_message, COSE_Header_IV, COSE_BOTH, NULL);
if ((pIV == NULL) || (pIV->type != CN_CBOR_BYTES)) {
perr->err = COSE_ERR_INVALID_PARAMETER;
errorReturn:
if (rgbOut != NULL) COSE_FREE(rgbOut, context);
EVP_CIPHER_CTX_cleanup(&ctx);
return false;
}
CHECK_CONDITION(pIV->length == 96/8, COSE_ERR_INVALID_PARAMETER);
memcpy(rgbIV, pIV->v.str, pIV->length);
// Setup and run the OpenSSL code
switch (cbKey) {
case 128 / 8:
cipher = EVP_aes_128_gcm();
break;
case 192 / 8:
cipher = EVP_aes_192_gcm();
break;
case 256 / 8:
cipher = EVP_aes_256_gcm();
break;
default:
FAIL_CONDITION(COSE_ERR_INVALID_PARAMETER);
break;
}
// Do the setup for OpenSSL
CHECK_CONDITION(EVP_DecryptInit_ex(&ctx, cipher, NULL, NULL, NULL), COSE_ERR_DECRYPT_FAILED);
CHECK_CONDITION(EVP_CIPHER_CTX_ctrl(&ctx, EVP_CTRL_CCM_SET_TAG, TSize, (void *)&pbCrypto[cbCrypto - TSize]), COSE_ERR_DECRYPT_FAILED);
CHECK_CONDITION(EVP_DecryptInit(&ctx, 0, pbKey, rgbIV), COSE_ERR_DECRYPT_FAILED);
// Pus in the AAD
CHECK_CONDITION(EVP_DecryptUpdate(&ctx, NULL, &outl, pbAuthData, (int) cbAuthData), COSE_ERR_DECRYPT_FAILED);
//
cbOut = (int)cbCrypto - TSize;
rgbOut = (byte *)COSE_CALLOC(cbOut, 1, context);
CHECK_CONDITION(rgbOut != NULL, COSE_ERR_OUT_OF_MEMORY);
// Process content
CHECK_CONDITION(EVP_DecryptUpdate(&ctx, rgbOut, &cbOut, pbCrypto, (int)cbCrypto - TSize), COSE_ERR_DECRYPT_FAILED);
// Process Tag
CHECK_CONDITION(EVP_CIPHER_CTX_ctrl(&ctx, EVP_CTRL_GCM_SET_TAG, TSize, (byte *)pbCrypto + cbCrypto - TSize), COSE_ERR_DECRYPT_FAILED);
// Check the result
CHECK_CONDITION(EVP_DecryptFinal(&ctx, rgbOut + cbOut, &cbOut), COSE_ERR_DECRYPT_FAILED);
EVP_CIPHER_CTX_cleanup(&ctx);
pcose->pbContent = rgbOut;
pcose->cbContent = cbOut;
return true;
}
