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/*
* Copyright (c) 2017 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* See SCTP for a discussion of CRC32C http://tools.ietf.org/html/rfc4960#appendix-B
* It is also used by iSCSI and other protocols.
*
* CRC-32C uses an initial value of 0xFFFFFFFF and a final XOR value of 0xFFFFFFFF.
*
*/
#include <config.h>
#include <stdio.h>
#include <LongBow/runtime.h>
#include <parc/algol/parc_Memory.h>
#include <parc/security/parc_CryptoHasher.h>
#include <ccnx/common/internal/ccnx_ValidationFacadeV1.h>
#include <ccnx/common/codec/schema_v1/ccnxCodecSchemaV1_TlvDictionary.h>
#include <fcntl.h>
#include <errno.h>
typedef struct crc32_signer {
PARCCryptoHasher *hasher;
} _CRC32Signer;
typedef struct crc32_verifier {
PARCCryptoHasher *hasher;
} _CRC32Verifier;
bool
ccnxValidationCRC32C_Set(CCNxTlvDictionary *message)
{
bool success = true;
switch (ccnxTlvDictionary_GetSchemaVersion(message)) {
case CCNxTlvDictionary_SchemaVersion_V1: {
success &= ccnxTlvDictionary_PutInteger(message, CCNxCodecSchemaV1TlvDictionary_ValidationFastArray_CRYPTO_SUITE, PARCCryptoSuite_NULL_CRC32C);
break;
}
default:
trapIllegalValue(message, "Unknown schema version: %d", ccnxTlvDictionary_GetSchemaVersion(message));
}
return success;
}
bool
ccnxValidationCRC32C_Test(const CCNxTlvDictionary *message)
{
switch (ccnxTlvDictionary_GetSchemaVersion(message)) {
case CCNxTlvDictionary_SchemaVersion_V1: {
if (ccnxTlvDictionary_IsValueInteger(message, CCNxCodecSchemaV1TlvDictionary_ValidationFastArray_CRYPTO_SUITE)) {
uint64_t cryptosuite = ccnxTlvDictionary_GetInteger(message, CCNxCodecSchemaV1TlvDictionary_ValidationFastArray_CRYPTO_SUITE);
return (cryptosuite == PARCCryptoSuite_NULL_CRC32C);
}
return false;
}
default:
trapIllegalValue(message, "Unknown schema version: %d", ccnxTlvDictionary_GetSchemaVersion(message));
}
return false;
}
static bool
_crc32cSigner_Destructor(_CRC32Signer **interfaceContextPtr)
{
_CRC32Signer *signer = *interfaceContextPtr;
parcCryptoHasher_Release(&signer->hasher);
return true;
}
parcObject_ImplementAcquire(_crc32CSigner, _CRC32Signer);
parcObject_ImplementRelease(_crc32CSigner, _CRC32Signer);
parcObject_Override(_CRC32Signer, PARCObject,
.destructor = (PARCObjectDestructor *) _crc32cSigner_Destructor);
static bool
_crc32Verifier_Destructor(_CRC32Verifier **verifierPtr)
{
_CRC32Verifier *verifier = (_CRC32Verifier *) *verifierPtr;
parcCryptoHasher_Release(&(verifier->hasher));
return true;
}
parcObject_ImplementAcquire(_crc32Verifier, _CRC32Verifier);
parcObject_ImplementRelease(_crc32Verifier, _CRC32Verifier);
parcObject_Override(_CRC32Verifier, PARCObject,
.destructor = (PARCObjectDestructor *) _crc32Verifier_Destructor);
static PARCSignature *
_crc32Signer_SignDigest(_CRC32Signer *interfaceContext, const PARCCryptoHash *cryptoHash)
{
PARCSignature *signature =
parcSignature_Create(PARCSigningAlgorithm_NULL, PARCCryptoHashType_CRC32C, parcCryptoHash_GetDigest(cryptoHash));
return signature;
}
static PARCSigningAlgorithm
_crc32Signer_GetSigningAlgorithm(_CRC32Signer *interfaceContext)
{
return PARCSigningAlgorithm_NULL;
}
static PARCCryptoHashType
_crc32Signer_GetCryptoHashType(_CRC32Signer *interfaceContext)
{
return PARCCryptoHashType_CRC32C;
}
static PARCCryptoHasher *
_crc32Signer_GetCryptoHasher(_CRC32Signer *signer)
{
return signer->hasher;
}
static PARCCryptoHasher *
_crc32Verifier_GetCryptoHasher(_CRC32Verifier *verifier, PARCKeyId *keyid, PARCCryptoHashType hashType)
{
assertTrue(hashType == PARCCryptoHashType_CRC32C, "Only supports PARCCryptoHashType_CRC32C, got request for %s", parcCryptoHashType_ToString(hashType));
return verifier->hasher;
}
static bool
_crc32Verifier_VerifyDigest(_CRC32Verifier *verifier, PARCKeyId *keyid, PARCCryptoHash *locallyComputedHash,
PARCCryptoSuite suite, PARCSignature *signatureToVerify)
{
assertTrue(suite == PARCCryptoSuite_NULL_CRC32C, "Only supports PARC_SUITE_NULL_CRC32C, got request for %d", suite);
PARCBuffer *calculatedCrc = parcCryptoHash_GetDigest(locallyComputedHash);
// the signature is the CRC, so we just need to compare to the to calculated CRC32C "hash"
PARCBuffer *crcToVerify = parcSignature_GetSignature(signatureToVerify);
return parcBuffer_Equals(calculatedCrc, crcToVerify);
}
static bool
_crc32Verifier_AllowedCryptoSuite(_CRC32Verifier *verifier, PARCKeyId *keyid, PARCCryptoSuite suite)
{
return (suite == PARCCryptoSuite_NULL_CRC32C);
}
PARCSigningInterface *CRC32SignerAsPARCSigner = &(PARCSigningInterface) {
.GetCryptoHasher = (PARCCryptoHasher * (*)(void *))_crc32Signer_GetCryptoHasher,
.SignDigest = (PARCSignature * (*)(void *, const PARCCryptoHash *))_crc32Signer_SignDigest,
.GetSigningAlgorithm = (PARCSigningAlgorithm (*)(void *))_crc32Signer_GetSigningAlgorithm,
.GetCryptoHashType = (PARCCryptoHashType (*)(void *))_crc32Signer_GetCryptoHashType
};
PARCVerifierInterface *CRC32VerifierAsPARCVerifier = &(PARCVerifierInterface) {
.GetCryptoHasher = (PARCCryptoHasher * (*)(void *, PARCKeyId *, PARCCryptoHashType))_crc32Verifier_GetCryptoHasher,
.VerifyDigest = (bool (*)(void *, PARCKeyId *, PARCCryptoHash *, PARCCryptoSuite, PARCSignature *))_crc32Verifier_VerifyDigest,
.AddKey = NULL,
.RemoveKeyId = NULL,
.AllowedCryptoSuite = (bool (*)(void *, PARCKeyId *, PARCCryptoSuite))_crc32Verifier_AllowedCryptoSuite,
};
static PARCSigner *
_crc32Signer_Create(void)
{
_CRC32Signer *crc32Signer = parcObject_CreateInstance(_CRC32Signer);
assertNotNull(crc32Signer, "parcObject_CreateInstance returned NULL");
crc32Signer->hasher = parcCryptoHasher_Create(PARCCryptoHashType_CRC32C);
PARCSigner *signer = parcSigner_Create(crc32Signer, CRC32SignerAsPARCSigner);
_crc32CSigner_Release(&crc32Signer);
return signer;
}
PARCSigner *
ccnxValidationCRC32C_CreateSigner(void)
{
return _crc32Signer_Create();
}
static PARCVerifier *
_crc32Verifier_Create(void)
{
_CRC32Verifier *crcVerifier = parcObject_CreateInstance(_CRC32Verifier);
assertNotNull(crcVerifier, "parcObject_CreateInstance returned NULL");
crcVerifier->hasher = parcCryptoHasher_Create(PARCCryptoHashType_CRC32C);
PARCVerifier *verifier = parcVerifier_Create(crcVerifier, CRC32VerifierAsPARCVerifier);
_crc32Verifier_Release(&crcVerifier);
return verifier;
}
PARCVerifier *
ccnxValidationCRC32C_CreateVerifier(void)
{
return _crc32Verifier_Create();
}
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