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/*
* cryptech_random.c
* -----------------
*
* This is a shim to connect the Cryptech TRNG to Cryptlib's CSPRNG.
*
* Prototype HAL code for the Cryptech environment already provides
* the RNG code required by the HAL, but it doesn't look like Cryptlib
* itself ever calls that, it only seems to use the system device's
* random function. So this shim just uses the code we already wrote
* to meet the HAL API requirement to feed Cryptlib's CSPRNG.
*
* Whether it makes sense to use what we hope is already a good TRNG
* just to provide entropy for a CSPRNG is a question for another day.
*
* Author: Rob Austein
* Copyright (c) 2014, SUNET
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#if defined( INC_ALL )
#include "crypt.h"
#include "context.h"
#include "hardware.h"
#include "random.h"
#else
#include "crypt.h"
#include "context/context.h"
#include "device/hardware.h"
#include "random/random.h"
#endif
#define FAST_BUFSIZE bitsToBytes(64)
#define SLOW_BUFSIZE (5 * FAST_BUFSIZE)
void fastPoll(void)
{
MESSAGE_DATA msgData;
unsigned char buffer[FAST_BUFSIZE];
if (hwGetRandom(buffer, sizeof(buffer)) == CRYPT_OK) {
setMessageData(&msgData, buffer, sizeof(buffer));
krnlSendMessage(SYSTEM_OBJECT_HANDLE, IMESSAGE_SETATTRIBUTE_S, &msgData, CRYPT_IATTRIBUTE_ENTROPY);
zeroise(buffer, sizeof(buffer));
}
}
void slowPoll(void)
{
MESSAGE_DATA msgData;
unsigned char buffer[SLOW_BUFSIZE];
int quality = 100;
if (hwGetRandom(buffer, sizeof(buffer)) == CRYPT_OK) {
setMessageData(&msgData, buffer, sizeof(buffer));
krnlSendMessage(SYSTEM_OBJECT_HANDLE, IMESSAGE_SETATTRIBUTE_S, &msgData, CRYPT_IATTRIBUTE_ENTROPY);
zeroise(buffer, sizeof(buffer));
krnlSendMessage(SYSTEM_OBJECT_HANDLE, IMESSAGE_SETATTRIBUTE, &quality, CRYPT_IATTRIBUTE_ENTROPY_QUALITY);
}
}
/*
* Might patch these out in random/random.h eventually, but no-op
* stubs will do for testing.
*/
void initRandomPolling(void)
{
return;
}
void endRandomPolling(void)
{
return;
}
CHECK_RETVAL \
int waitforRandomCompletion(const BOOLEAN force)
{
return CRYPT_OK;
}
CHECK_RETVAL_BOOL \
BOOLEAN checkForked(void)
{
return FALSE;
}
/*
* "Any programmer who fails to comply with the standard naming, formatting,
* or commenting conventions should be shot. If it so happens that it is
* inconvenient to shoot him, then he is to be politely requested to recode
* his program in adherence to the above standard."
* -- Michael Spier, Digital Equipment Corporation
*
* Local variables:
* indent-tabs-mode: nil
* End:
*/
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