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/**
** Simple entropy harvester based upon the havege RNG
**
** Copyright 2018-2021 Jirka Hladky hladky DOT jiri AT gmail DOT com
** Copyright 2012-2014 Gary Wuertz gary@issiweb.com
** Copyright 2012 BenEleventh Consulting manolson@beneleventh.com
**
** This program is free software: you can redistribute it and/or modify
** it under the terms of the GNU General Public License as published by
** the Free Software Foundation, either version 3 of the License, or
** (at your option) any later version.
**
** This program is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
** GNU General Public License for more details.
**
** You should have received a copy of the GNU General Public License
** along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef HAVEGETEST_H
#define HAVEGETEST_H
/**
* The haveged test suite is built from the 8 tests specified in AIS-31
* organized into test procedure A and test procedure B and structured
* as state machines capable of processing segmented input streams.
*/
#include "havegecollect.h"
/**
* All individual tests and the test procedures use the following
* simple state machine to manage input.
*/
typedef enum {
TEST_INIT, /* initialize test (internal) */
TEST_INPUT, /* test input needed */
TEST_EVAL, /* evaluating results (internal) */
TEST_DONE, /* test complete */
TEST_RETRY, /* retry the test */
TEST_IGNORE, /* ignore failure and continue */
TEST_FAIL /* Test has failed */
} TEST_STATE;
/**
* AIS-31 procedure A uses the FIPS140-1 as test1 thru test4. A disjointedness test is
* used as test0 and a autocorrelation test is used as test5. test0 is executed only
* once, the other tests are repeated in sequence 257 times.
*/
#define AIS_A_REPS 257 /* reps for test1 through test 5 */
/**
* Constants for the fips tests. Note AIS-31 v1 uses the unamended FIPS test limits
*/
#define FIPS_USED 20000
#ifndef USE_AMENDED_FIPS
#define FIPS_MAX_RUN 34
#define FIPS_ONES_LOW 9654
#define FIPS_ONES_HIGH 10346
#define FIPS_POKER_LOW 1562822 /* 1.03 */
#define FIPS_POKER_HIGH 1580438 /* 57.4 */
#define FIPS_RUNS_LOW 2267,1079,502,223,90,90
#define FIPS_RUNS_HIGH 2733,1421,748,402,223,223
#else
#define FIPS_MAX_RUN 25
#define FIPS_ONES_LOW 9725
#define FIPS_ONES_HIGH 10275
#define FIPS_POKER_LOW 1576928 /* 2.16 */
#define FIPS_POKER_HIGH 1576928 /* 46.17 */
#define FIPS_RUNS_LOW 2315,1114,525,240,103,103
#define FIPS_RUNS_HIGH 2685,1386,723,384,209,209
#endif
/**
* test 0 consumes 64k * 48 bits
*/
#define TEST0_LENGTH 65536
#define TEST0_USED (TEST0_LENGTH * 48)
#define TEST5_LENGTH 5000
/**
* Fixed size input for procedure A
*/
#define AIS_A_SIZE (TEST0_USED+(2500*257))
/**
* AIS-31 procedure A results
*/
typedef struct {
H_UINT testResult; /* id 8 bits, pass/fail 8bits */
H_UINT finalValue; /* end result */
} resultA;
/**
* AIS-31 procedure A context. Options are defined in haveged.h
* This puppy weighs in at ~3 MB.
*/
typedef struct {
H_UINT8 *data; /* input for test */
H_UINT range; /* number of bits of input */
H_UINT procState; /* procedure state */
H_UINT procRetry; /* retry indication */
H_UINT testId; /* test selector 0-5 */
H_UINT testRun; /* test index 1 - 1285 */
H_UINT testState; /* FSM state of current test */
H_UINT bridge; /* index for data bridge */
H_UINT bytesUsed; /* number of bytes used */
H_UINT options; /* duty cycle for test5 */
H_UINT8 aux[TEST0_USED]; /* extra work space */
resultA results[1286]; /* test results */
} procA;
/**
* AIS-31 procedure B is a set of multinomial distribution tests
* and an entropy estimate (Coron' test). The distribution tests,
* test6 and test7, require at least AIS_LENGTH sequences of 1, 2
* 4, and 8 bits.
*/
/*
* Bit range of AIS-31 procedure B distribution tests
*/
#define AIS_LENGTH 100000
/**
* AIS-31 test8 constants (Coron's test)
*/
#define Q 2560
#define K 256000
#define LN2 0.69314718055994530941
/**
* AIS-31 procedure B results
*/
typedef struct {
H_UINT testResult; /* id 8 bits, pass/fail 8bits */
double finalValue; /* final value */
} resultB;
/**
* AIS-31 procedure B context, a svelt 1.25 KB
*/
typedef struct {
H_UINT *noise; /* input for test */
H_UINT range; /* number of bits of input */
H_UINT procState; /* procedure state */
H_UINT procRetry; /* retry indication */
H_UINT testId; /* test selector 6-8 */
H_UINT testNbr; /* current test number */
H_UINT testState; /* FSM state of current test */
H_UINT seq; /* aisSeq() sequence needed */
H_UINT bitsUsed; /* bits used by procedure */
H_UINT bridge; /* data bridge test6,7 */
H_UINT counter[8]; /* sequence lengths */
H_UINT einsen[8]; /* sequence counts (ones) */
H_UINT full; /* sequence flags */
H_UINT lastpos[256]; /* counters for test 8 */
H_UINT options; /* RFU */
resultB results[9]; /* test results */
} procB;
/**
* Testing options
*/
#define A_CYCLE 0x000001ff /* test5 duty cycle */
#define A_WARN 0x00000200 /* Only warn of A fails */
#define A_RUN 0x00000400 /* Run procedure A */
#define A_OPTIONS 0x000003ff
#define B_WARN 0x00001000 /* Only warn of B fails */
#define B_RUN 0x00002000 /* Run proceure B */
#define B_OPTIONS 0x00001000
#define X_OPTIONS 0x000f0000 /* isolated test index */
#define X_RUN 0x00100000 /* diagnostic isolated test */
/**
* A test procedure run consists of an indicator and options
*/
typedef struct {
H_UINT action; /* action code A_RUN, B_RUN */
H_UINT options; /* WARN and other options */
} procInst;
/**
* Services provided
*/
typedef int (*ptrDiscard)(H_COLLECT *rdr);
typedef void (*ptrReport)(H_COLLECT * h_ctxt, H_UINT action, H_UINT prod, H_UINT state, H_UINT ct);
typedef int (*ptrRun)(H_COLLECT *rdr, H_UINT prod);
/**
* A test procedure is associated with a collection buffer. Some
* resources are shared by all collection buffers. This includes
* roll-your-own vtable used to avoid polluting the RNG name space
* This structure ends up in hptr->testData
*/
typedef struct {
ptrDiscard discard; /* release test resources */
ptrRun run; /* run test suite */
ptrReport report; /* report test results */
H_UINT options; /* verbosity, etc. */
H_UINT testsUsed; /* tests used */
procInst totTests[2]; /* tot tests to run */
procInst runTests[2]; /* production tests to run */
H_UINT procReps; /* Number of A repetitions */
H_UINT fips_low[6]; /* low runs thresholds */
H_UINT fips_high[6]; /* high runs thresholds */
char totText[8]; /* tot test text rep */
char prodText[8]; /* production test text rep */
H_UINT meters[H_OLT_PROD_B_P+1]; /* test counters */
double lastCoron; /* last test8 result */
double *G; /* test8 lookup table */
} procShared;
/**
* How to get test context and shared data from H_COLLECT
*/
#define TESTS_CONTEXT(c) (onlineTests *)(c->havege_tests)
#define TESTS_SHARED(c) (procShared *)(((H_PTR)(c->havege_app))->testData)
/**
* Online testing context - one per collector. Note szTotal is for diagnostic
* use only, no effort is made to account for overflow.
*/
typedef struct {
H_UINT result; /* nz if failed */
H_UINT totIdx; /* tot test idx */
H_UINT runIdx; /* run test idx */
H_UINT szCarry; /* bits carried in next proc */
H_UINT szTotal; /* total bits processed */
procA *pA; /* procedure A instance */
procB *pB; /* procedure B instance */
} onlineTests;
/**
* Default options are to run the tot tests.
*/
#define DEFAULT_TEST_OPTIONS "ta8b"
/**
* Public interface
*/
int havege_test(procShared *tps, H_PARAMS *params);
#endif
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