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netbsd/sys/dev/pci/n8/common/api/n8_rng.c
Lionel Sambuc 58d5f9a2a4 2012/10/17 12:00:00 UTC
2013-04-06 16:48:33 +02:00

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/*-
* Copyright (C) 2001-2003 by NBMK Encryption Technologies.
* All rights reserved.
*
* NBMK Encryption Technologies provides no support of any kind for
* this software. Questions or concerns about it may be addressed to
* the members of the relevant open-source community at
* <tech-crypto@netbsd.org>.
*
* 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.
*/
static char const n8_id[] = "$Id: n8_rng.c,v 1.1 2008/10/30 12:02:15 darran Exp $";
/*****************************************************************************/
/** @file n8_rng.c
* @brief Contains Random Number Generator interface functions
*
* Functions:
* N8_SetRNGParameters - Sets the operating parameters for the
* Random Number Generator.
* N8_GetRNGParameters - Gets the operating parameters for the
* Random Number Generator.
* N8_GetRandomBytes - Gets requested number of random bytes.
*
*****************************************************************************/
/*****************************************************************************
* Revision history:
* 07/28/03 brr Removed obsolete #ifdefs. (Bug 918)
* 05/19/03 brr Clean up include files.
* 05/15/03 brr Eliminated obsolete n8_rng.h & updated constants.
* 11/25/02 brr Use new define N8_RNG_UNIT to set/get RNG parameters.
* 05/15/02 brr Rework RNG queue such that ioctl returns the bytes requested.
* 04/04/02 msz Fix for BUG 685 (INCONSISTANT not INVALID OBJECT)
* 04/02/02 msz Fix for BUG 503 (not catching weak key of all zeros - check
* key after setting parity.)
* 03/26/02 msz Fix for BUG 506 (external clock w/o seed source external)
* Fix for BUG 507 (check seed source)
* Fix for BUG 509 (null pointer on get random bytes)
* 03/20/02 msz Fix for BUG 508 (check for request of 0 bytes.)
* 03/08/02 msz Request Handler callback is optional.
* 02/28/02 msz Request Handler callback is back.
* 02/28/02 brr Do not include any QMgr include files.
* 02/18/02 msz No longer need Request Handler callback. No longer need
* references to the queue control structure. No longer need
* current_RNGparms_gp. No longer need initRNGParameters
* 02/15/02 brr Correct DBG print for requestStatus.
* 02/06/02 bac Added error checking to functions even in the temporary
* USE_OS_RNG path so that QA tests behave as expected.
* 01/29/02 bac Changed Get/Set parameters to do nothing if using
* OS rand function.
* 01/29/02 bac Changed N8_GetRandomBytes to use rand() instead of the
* behavioral model. This is a temporary measure until the
* NSP2000 hardware fix is effected.
* 11/13/01 brr Removed references to shared_resource.
* 11/10/01 brr Modified to support static allocations of persistant data
* by the driver.
* 11/07/01 mel Fixed Bugs #187 , #188 , #189 - cosmetic changes
* 10/05/01 msz Added slightly more protection around current_RNGparms_gp.
* 10/05/01 msz Added support for mulitple RNG execution units.
* 10/04/01 msz Added internal initRNGParameters.
* 10/02/01 msz Continued merging, use n8_get_shared_resource
* 09/25/01 msz Removed bufferLen_log2 from N8_RNG_Parameter_t.
* Ask QMgr if hardware has been already initialized before
* initializing it. Put current parameters in shared memory.
* 09/20/01 bac Changed Key_cblock to key_cblock_t to follow coding stds.
* 09/17/01 bac Removed occurence of buffer_source in a DBG statement.
* 09/14/01 bac Removed buffer_source from RNG parameters. It will always be
* X917. Also removed reference to enums for seed source and use
* the new bit-pattern macros instead.
* 09/07/01 bac Changed the return code to N8_INVALID_OBJECT if
* N8_SetRNGParameters includes a buffer size that is too large
* -- as listed in the API Programmer Reference. (BUG #157)
* 09/07/01 bac Added a return code check after calling set parameters.
* (BUG #156).
* 09/11/01 msz Adjusted N8_RNG_Parameter_t parameters
* 09/04/01 bac Fixed BUG #56 by editting comments.
* 08/27/01 msz Renamed fcnToCallbackWhenRequestIsFilled to callback
* 08/08/01 msz Use internal seed, external does not work on FPGA.
* 08/08/01 msz Include n8_semaphore.h directly.
* 08/07/01 hml Added Locks section to appropriate comment block.
* 08/07/01 hml Added protection of globals with a process level semaphore.
* 08/03/01 msz Added a test for request_p not zero before de-referencing
* it in N8_GetRandomBytes.
* 08/02/01 bac Changed the default to set seed source to internal. Also
* fixed a bug when freeing a request.
* 07/31/01 bac Added call to N8_preamble for all public interfaces.
* 07/31/01 bac Check to ensure a request to get random bytes is not for more
* than RNG_MAX_REQUEST as required by the specification.
* 07/30/01 bac Set the queue pointer in the request.
* 07/12/01 bac Deleted unused variables.
* 06/28/01 bac Changes to hook-up callback function and get event handling to
* work properly.
* 06/25/01 bac Substantial changes to support QMgr v 1.0.1 and new kernel
* memory management. Added event to the GetRandomBytes call.
* 06/20/01 mel Corrected use of kernel memory.
* 05/30/01 mel Deleted checkKeyForWeakness and checkKeyParity.
* Added forcing parity on key.
* 05/21/01 bac Converted to use N8_ContextHandle_t.
* 05/18/01 bac Memory management macros.
* 05/03/01 bac Replaced integer use of NULL with 0.
* 04/30/01 bac Fixed problem with resultHandler to eliminate compiler
* warnings. Warning that resultHandler is defined but not
* used still exists as this problem needs to be resolved.
* 04/12/01 mel Original version.
****************************************************************************/
/** @defgroup RNG Random Number Methods
*/
#include "n8_common.h" /* common definitions */
#include "n8_pub_errors.h" /* Errors definition */
#include "n8_pub_types.h" /* Some type definitions. */
#include "n8_enqueue_common.h" /* common definitions for enqueue */
#include "n8_util.h" /* definitions for CHECK_RETURN and other macros */
#include "n8_key_works.h" /* definitions for functions that work with key */
#include "n8_API_Initialize.h"
#include "n8_semaphore.h"
#include "n8_rand.h"
/*****************************************************************************
* N8_SetRNGParameters
*****************************************************************************/
/** @ingroup RNG
* @brief Sets the operating parameters for Random Number Generator.
*
* Sets the operating parameters for the Random Number Generator to the
* values contained in the N8_RNG_Parameter_t object. These parameters
* include the base address of the host memory buffer into which the RNG
* will write random values, the size of this buffer (in terms of entries,
* where each entry is a 64-bit random value), the seed source to use, etc.
* as defined in the RNG specification. Once this call returns, all values
* returned by N8_GetRandomBytes will be values generated using the parameters
* specified in this call (up until a subsequent call to N8_SetRNGParameters).
* A call to N8_SetRNGParameters must be made before N8_GetRandomBytes can
* return any random values.
*
* Currently this code will set parameters on all RNG units the same way.
* Thus, when we go to set parameters, we will tell RN code to set parameters
* on all units.
*
* @param p RO: Pointer to N8_RNG_Parameter_t
*
*
* @return
* ret - returns N8_STATUS_OK if successful or Error value.
*
* @par Errors:
* N8_INVALID_OBJECT - one or more values specified in
* N8_RNG_Parameter_t are outside its
* permitted range <BR>
* N8_INCONSISTENT - the values specified in
* N8_RNG_Parameter_t are not
* consistent with one another <BR>
* N8_WEAK_KEY - key1 or key2 or both - weak key(s) <BR>
* N8_INVALID_ENUM - buffer/seed type is invalid <BR>
* N8_INVALID_INPUT_SIZE - invalid size of the kernel-space
* buffer <BR>
* N8_INVALID_KEY - key's parity check failed
*
* @par Locks:
* None.
*
* @par Assumptions:
* None.
*
*****************************************************************************/
#define TOD_MIN 100
N8_Status_t N8_SetRNGParameters(N8_RNG_Parameter_t *p)
{
N8_Status_t ret = N8_STATUS_OK;
key_cblock_t key1, key2; /* Keys to be checked */
uint32_t i;
DBG(("N8_SetRNGParameters(N8_RNG_Parameter_t *p)\n"));
do
{
ret = N8_preamble();
CHECK_RETURN(ret);
/* verify RNG parameter object */
CHECK_OBJECT(p, ret);
/*
* 1. verify parameters for range and consistency
*/
/* verify the consistency of the Time of the Day parameters */
if ((p->set_TOD_counter == N8_TRUE) && (p->TOD_prescale < TOD_MIN))
{
DBG(("TOD_prescale is out of range: %d\n", p->TOD_prescale));
DBG(("N8_SetRNGParameters - return Error\n"));
ret = N8_INCONSISTENT;
break;
}
/* build keys for weakness and parity verification */
for ( i = 0; i < N8_DES_KEY_LENGTH; i++ )
{
key1[i] = p->key1[i];
key2[i] = p->key2[i];
}
/* check key1 and key2 for parity and force parity if needed*/
if (checkKeyParity(&key1) == N8_FALSE)
{
forceParity(&key1);
for ( i = 0; i < N8_DES_KEY_LENGTH; i++ )
{
p->key1[i] = key1[i];
}
}
if(checkKeyParity(&key2) == N8_FALSE)
{
forceParity(&key2);
for ( i = 0; i < N8_DES_KEY_LENGTH; i++ )
{
p->key2[i] = key2[i];
}
}
/* check key1 and key2 for weakness */
if (checkKeyForWeakness(&key1) == N8_TRUE ||
checkKeyForWeakness(&key2) == N8_TRUE)
{
DBG(("Weak key\nN8_SetRNGParameters - return Error\n"));
ret = N8_WEAK_KEY;
break;
}
CHECK_RETURN(ret);
/* verify iteration_count. */
if ((p->iteration_count < 1) || (p->iteration_count > 256))
{
DBG(("Iteration count is out of range\n"));
DBG(("N8_SetRNGParameters - return Error\n"));
/* iteration count is out of range */
ret = N8_INVALID_OBJECT;
break;
}
/* Check seed souce */
if ( (p->seed_source != N8_RNG_SEED_INTERNAL) /* &&
(p->seed_source != N8_RNG_SEED_EXTERNAL) &&
(p->seed_source != N8_RNG_SEED_HOST) */ )
{
DBG(("Invalid seed source\n"));
DBG(("N8_SetRNGParameters - return Error\n"));
ret = N8_INVALID_VALUE;
break;
}
/* Check for use of external clock without seed being seed external */
if ((p->use_external_clock == N8_TRUE) &&
(p->seed_source != N8_RNG_SEED_EXTERNAL))
{
DBG(("External clock set without seed source external\n"));
DBG(("N8_SetRNGParameters - return Error\n"));
ret = N8_INCONSISTENT;
break;
}
/*
* 2. set parameters in queue manager
*/
/* Initialize parameters in queue manager. All RNG units are */
/* initialized the same way. */
/* if queue was not able to set parameters return invalid object error */
ret = RN_SetParameters(p, N8_RNG_UNIT);
if (ret != N8_STATUS_OK)
{
DBG(("Queue was not able to set parameters\n"));
DBG(("N8_SetRNGParameters - return Error\n"));
N8_PRINT("N8_SetRNGParameters - return %d\n", ret);
ret = N8_INVALID_OBJECT;
break;
}
DBG(("N8_SetRNGParameters - FINISHED\n"));
} while (FALSE);
return ret;
} /* N8_SetRNGParameters */
/*****************************************************************************
* N8_GetRNGParameters
*****************************************************************************/
/** @ingroup RNG
* @brief Gets the current operating parameters for RNG.
*
* Gets the current operating parameters for the Random Number Generator and
* returns their values in the N8_RNG_Parameter_t object. These parameters
* include the size of this buffer (in terms of entries, where each entry is a
* 64-bit random value), the seed source to use, etc. as defined in the RNG
* specification. This call has no effect on the operation of the RNG. A call
* to N8_GetRNGParameters made before any call to N8_SetRNGParameters will
* return whatever values are in the RNG's registers at the time of the call.
*
* We currently set all RNG units up the same way. So for the most part
* all parameters are the same on each unit. However, when we look at
* hardware specific parameters, we need to tell RN code to get parameters
* from all units. The RN code will handle any specific manipulation of
* the individual units to present one overall view.
*
* @param p WO: Pointer to N8_RNG_Parameter_t
*
* @return
* ret - returns N8_STATUS_OK if successful or Error value.
*
* @par Errors:
* N8_INVALID_OBJECT - Pointer to N8_RNG_Parameter_t is NULL<BR>
* N8_NOT_INITIALIZED - RNG wasn't initialized<BR>
*
* @par Locks:
* None.
*
* @par Assumptions:
* Assumes hardware is or will be initialized.
*****************************************************************************/
N8_Status_t N8_GetRNGParameters(N8_RNG_Parameter_t *p)
{
N8_Status_t ret = N8_STATUS_OK; /* the return status: OK or ERROR */
DBG(("N8_GetRNGParameters(N8_RNG_Parameter_t *p)\n"));
do
{
ret = N8_preamble();
CHECK_RETURN(ret);
/* verify RNG parameter object */
CHECK_OBJECT(p, ret);
/* QMgr keeps the copy of what the RNG Parameters look like. It */
/* will fill in the parameters */
ret = RN_GetParameters(p, N8_RNG_UNIT);
if (ret != N8_STATUS_OK)
{
DBG(("Queue was not able to get parameters\n"));
DBG(("N8_GetRNGParameters - return Error\n"));
ret = N8_INVALID_OBJECT;
break;
}
/* Set set_TOD_counter to N8_FALSE, as that is what is claimed to */
/* be done in n8_rn_common.h's documentation. */
p->set_TOD_counter = N8_FALSE;
DBG(("todEnable = %s\n",
(p->todEnable == N8_TRUE) ? "N8_TRUE" : "N8_FALSE"));
DBG(("use_external_clock = %s\n",
(p->use_external_clock == N8_TRUE) ? "N8_TRUE" : "N8_FALSE"));
DBG(("seed_source = %d\n", p->seed_source));
DBG(("iteration_count = %d\n", p->iteration_count));
DBG(("TOD_prescale = %x\n", p->TOD_prescale));
DBG(("set_TOD_counter = %s\n",
(p->set_TOD_counter == N8_TRUE) ? "N8_TRUE" : "N8_FALSE"));
/* Note - These DBG lines assume N8_DES_KEY_LENGTH is 8 */
DBG(("key1 = %02x%02x%02x%02x%02x%02x%02x%02x\n",
p->key1[0],p->key1[1],p->key1[2],p->key1[3],
p->key1[4],p->key1[5],p->key1[6],p->key1[7]));
DBG(("key1 = %02x%02x%02x%02x%02x%02x%02x%02x\n",
p->key2[0],p->key2[1],p->key2[2],p->key2[3],
p->key2[4],p->key2[5],p->key2[6],p->key2[7]));
DBG(("hostSeed = %02x%02x%02x%02x%02x%02x%02x%02x\n",
p->hostSeed[0],p->hostSeed[1],p->hostSeed[2],p->hostSeed[3],
p->hostSeed[4],p->hostSeed[5],p->hostSeed[6],p->hostSeed[7]));
DBG(("initial_TOD_seconds = %x\n", p->initial_TOD_seconds));
DBG(("externalClockScaler = %x\n", p->externalClockScaler));
DBG(("hostSeedValid = %s\n",
(p->hostSeedValid == N8_TRUE) ? "N8_TRUE" : "N8_FALSE"));
DBG(("seedErrorFlag = %s\n",
(p->seedErrorFlag == N8_TRUE) ? "N8_TRUE" : "N8_FALSE"));
DBG(("x9_17_errorFlag = %s\n",
(p->x9_17_errorFlag == N8_TRUE) ? "N8_TRUE" : "N8_FALSE"));
DBG(("seedValue_ms = %08x\n", p->seedValue_ms));
DBG(("seedValue_ls = %08x\n", p->seedValue_ls));
DBG(("N8_GetRNGParameters - FINISHED\n"));
} while(FALSE);
return ret;
} /* N8_GetRNGParameters */
/*****************************************************************************
* N8_GetRandomBytes
*****************************************************************************/
/** @ingroup RNG
* @brief Gets random bytes generated by the RNG.
*
* Gets reqvested number of random bytes generated by the RNG and returns
* them in the buffer, which must be at least as big as number of random bytes
* reqvested. Up to 8 K random bytes can be returned in a single call. A call
* to N8_SetRNGParameters must be made before N8_GetRandomBytes can return
* any values.
*
* We currently pick a unit (next available) to get the parameters.
* This is ok, as all RNG units are set up the same way.
*
* @param num_bytes RO: The number of random bytes desired
* @param buf WO: The buffer for returned random bytes
* @param event_p RW: On input, if null the call is synchronous
* and no event is returned. The operation
* is complete when the call returns. If
* non-null, then the call is asynchronous;
* an event is returned that can be used to
* determine when the operation completes.
*
*
* @return
* ret - returns N8_STATUS_OK if successful or Error value.
* buf - the returned random bytes<BR>
*
* @par Errors:
* N8_NOT_INITIALIZED - the RNG has not been initialized<BR>
* N8_INVALID_INPUT_SIZE - num_bytes is less than 0
* or more than 8 KBytes<BR>
*
* @par Assumptions:
* Buffer is pre-allocated and is large enough.
*****************************************************************************/
N8_Status_t N8_GetRandomBytes(int num_bytes, char *buf_p, N8_Event_t *event_p)
{
RN_Request_t rn_request; /* RNG request structure */
N8_Status_t ret;
DBG(("N8_GetRandomBytes\n"));
do
{
/* check the buffer */
CHECK_OBJECT(buf_p, ret);
/* check the number of bytes requested
it can't be less or equal to 0 or more than N8_RNG_MAX_REQUEST. */
if ((num_bytes <= 0) || (num_bytes > N8_RNG_MAX_REQUEST))
{
DBG(("Number of bytes requested is out of range : %d\n", num_bytes));
DBG(("N8_GetRandomBytes - return Error\n"));
ret = N8_INVALID_INPUT_SIZE;
break;
}
ret = N8_preamble();
CHECK_RETURN(ret);
rn_request.userRequest = N8_FALSE;
rn_request.userBuffer_p = buf_p;
rn_request.numBytesRequested = num_bytes;
/* we have a valid request. queue it up. */
ret = Queue_RN_request(&rn_request);
CHECK_RETURN(ret);
if (event_p != NULL)
{
N8_SET_EVENT_FINISHED(event_p, N8_RNG);
}
} while (FALSE);
return ret;
} /* N8_GetRandomBytes */
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