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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.
*/
#ifndef _WIN32
#include <unistd.h>
#endif
#include <config.h>
#include <stdlib.h>
#include <fcntl.h>
#include <parc/algol/parc_Object.h>
#include <parc/algol/parc_DisplayIndented.h>
#include <parc/algol/parc_Memory.h>
#include <parc/security/parc_SecureRandom.h>
struct parc_securerandom {
int randomfd;
};
static bool
_parcSecureRandom_Destructor(PARCSecureRandom **instancePtr)
{
parcAssertNotNull(instancePtr, "Parameter must be a non-null pointer to a PARCSecureRandom pointer.");
PARCSecureRandom *instance = *instancePtr;
close(instance->randomfd);
return true;
}
parcObject_ImplementAcquire(parcSecureRandom, PARCSecureRandom);
parcObject_ImplementRelease(parcSecureRandom, PARCSecureRandom);
parcObject_Override(PARCSecureRandom, PARCObject,
.destructor = (PARCObjectDestructor *) _parcSecureRandom_Destructor);
void
parcSecureRandom_AssertValid(const PARCSecureRandom *instance)
{
parcAssertTrue(parcSecureRandom_IsValid(instance),
"PARCSecureRandom is not valid.");
}
PARCSecureRandom *
parcSecureRandom_Create()
{
PARCSecureRandom *result = NULL;
int fd = open("/dev/urandom", O_RDWR);
if (fd != -1) {
result = parcObject_CreateInstance(PARCSecureRandom);
if (result != NULL) {
result->randomfd = fd;
} else {
close(fd);
}
}
return result;
}
static void
_parcSecureRandom_ReSeed(PARCSecureRandom *random, PARCBuffer *buffer)
{
size_t length = parcBuffer_Remaining(buffer);
int wrote_bytes = write(random->randomfd, parcBuffer_Overlay(buffer, length), (long)length);
}
PARCSecureRandom *
parcSecureRandom_CreateWithSeed(PARCBuffer *seed)
{
PARCSecureRandom *result = parcSecureRandom_Create();
if (result != NULL) {
_parcSecureRandom_ReSeed(result, seed);
}
return result;
}
uint32_t
parcSecureRandom_Next(PARCSecureRandom *random)
{
uint32_t value;
int read_bytes = read(random->randomfd, &value, sizeof(value));
return value;
}
ssize_t
parcSecureRandom_NextBytes(PARCSecureRandom *random, PARCBuffer *buffer)
{
size_t length = parcBuffer_Remaining(buffer);
ssize_t result = read(random->randomfd, parcBuffer_Overlay(buffer, 0), (unsigned int)length);
return result;
}
bool
parcSecureRandom_IsValid(const PARCSecureRandom *instance)
{
bool result = false;
if (instance != NULL) {
if (instance->randomfd != -1) {
result = true;
}
}
return result;
}
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