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Diffstat (limited to 'tests/test-trng.c')
| -rw-r--r-- | tests/test-trng.c | 123 |
1 files changed, 123 insertions, 0 deletions
diff --git a/tests/test-trng.c b/tests/test-trng.c new file mode 100644 index 0000000..8ca64e0 --- /dev/null +++ b/tests/test-trng.c @@ -0,0 +1,123 @@ +/* + * Copyright (c) 2015, NORDUnet A/S All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: + * - Redistributions of source code must retain the above copyright notice, + * this list of conditions and the following disclaimer. + * + * - 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. + * + * - Neither the name of the NORDUnet nor the names of its contributors may + * be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * 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 + * HOLDER 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. + */ + +/* + * NOTE: This just exercises the interface to the TRNG cores, and displays + * a few words of random data. It does not attempt to analyse the quality + * of the data; for that, use something like dieharder. + */ + +#include <stdio.h> +#include <stdlib.h> +#include <stdint.h> +#include <string.h> +#include <assert.h> + +#include <sys/time.h> + +#include <hal.h> +#include <verilog_constants.h> + +#ifndef WAIT_FOR_CSPRNG_VALID +#define WAIT_FOR_CSPRNG_VALID 0 +#endif + +static void show_core(const hal_core_t *core, const char *whinge) +{ + const hal_core_info_t *core_info = hal_core_info(core); + if (core_info != NULL) + printf("\"%8.8s\" \"%4.4s\"\n", core_info->name, core_info->version); + else if (whinge != NULL) + printf("%s core not present\n", whinge); +} + +static hal_error_t test_random(const char *name) +{ + const hal_core_t *core; + hal_error_t err; + uint32_t rnd; + int i; + + core = hal_core_find(name, NULL); + show_core(core, name); + if (core == NULL) + return HAL_ERROR_CORE_NOT_FOUND; + + for (i = 0; i < 8; ++i) { + /* The entropy sources are faster than the bus speed, so querying + * the "status_valid" bit always returns true. Also, at the + * moment, the trng cores use bit 0 for valid, while all the other + * cores use bit 1, so we query the "status_ready" bit. + */ + if (WAIT_FOR_CSPRNG_VALID && (err = hal_io_wait_ready(core)) != HAL_OK) { + printf("hal_io_wait_valid: %s\n", hal_error_string(err)); + return err; + } + + /* We use symbol CSPRNG_ADDR_RANDOM here, but the entropy sources + * present their data on the same register number. + */ + if ((err = hal_io_read(core, CSPRNG_ADDR_RANDOM, (uint8_t *) &rnd, sizeof(rnd))) != HAL_OK) { + printf("hal_io_read: %s\n", hal_error_string(err)); + return err; + } + + printf("%08lx ", rnd); + } + printf("\n"); + + return HAL_OK; +} + +int main(void) +{ + hal_error_t err; + uint32_t rnd[8]; + int i; + + /* Exercise the API function. This gets random data from the CSPRNG, + * so we end up hitting that twice. + */ + printf("hal_get_random:\n"); + if ((err = hal_get_random(NULL, (void *) &rnd, sizeof(rnd))) != HAL_OK) { + printf("hal_get_random: %s\n", hal_error_string(err)); + } + else { + for (i = 0; i < 8; ++i) { + printf("%08lx ", rnd[i]); + } + printf("\n"); + } + + return + test_random(AVALANCHE_ENTROPY_NAME) || + test_random(ROSC_ENTROPY_NAME) || + test_random(CSPRNG_NAME); +} |