| /* |
| * Hardware entropy |
| * |
| * Copyright The Mbed TLS Contributors |
| * SPDX-License-Identifier: Apache-2.0 |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); you may |
| * not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT |
| * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #include "common.h" |
| |
| #if defined(MBEDTLS_ENTROPY_HARDWARE_ALT) |
| |
| #include "multithread.h" |
| #include "trng.h" |
| #include <string.h> |
| |
| int mbedtls_hardware_poll(void * data, unsigned char * output, size_t len, size_t * olen) |
| { |
| (void) data; |
| |
| if (output != NULL && len != 0 && olen != NULL) |
| { |
| mbedtls_entropy_lock(); |
| *olen = 0; |
| extern unsigned int g_rnd_m_w; |
| while (len / sizeof(g_rnd_m_w) != 0) |
| { |
| trng_init(); |
| *((unsigned int *) output) = g_rnd_m_w; |
| output += sizeof(g_rnd_m_w); |
| len -= sizeof(g_rnd_m_w); |
| *olen += sizeof(g_rnd_m_w); |
| } |
| if (len != 0) |
| { |
| trng_init(); |
| memcpy(output, &g_rnd_m_w, len); |
| *olen += len; |
| } |
| mbedtls_entropy_unlock(); |
| } |
| return 0; |
| } |
| |
| #endif /* MBEDTLS_ENTROPY_HARDWARE_ALT */ |