/* * csprng.c * -------- * HAL interface to Cryptech CSPRNG. * * Authors: Joachim Strömbergson, Paul Selkirk, Rob Austein * Copyright (c) 2014-2015, 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. */ #include #include "hal.h" #include "hal_internal.h" #ifndef WAIT_FOR_CSPRNG_VALID #define WAIT_FOR_CSPRNG_VALID 1 #endif hal_error_t hal_get_random(hal_core_t *core, void *buffer, const size_t length) { uint8_t temp[4], *buf = buffer; hal_error_t err; size_t i; if ((err = hal_core_alloc(CSPRNG_NAME, &core)) != HAL_OK) return err; for (i = 0; i < length; i += 4) { const int last = (length - i) < 4; if (WAIT_FOR_CSPRNG_VALID && (err = hal_io_wait_valid(core)) != HAL_OK) goto out; if ((err = hal_io_read(core, CSPRNG_ADDR_RANDOM, (last ? temp : &buf[i]), 4)) != HAL_OK) goto out; if (last) for (; i < length; i++) buf[i] = temp[i&3]; } for (i = 0, buf = buffer; i < length; i++, buf++) if (*buf != 0) { err = HAL_OK; goto out; } err = HAL_ERROR_CSPRNG_BROKEN; out: hal_core_free(core); return err; } /* * "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: */ 46d01429fc74f8696f0da2f0a'>test-rsa.c
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