random.c (a6a144698db93a2c456d1e3811140cadef1ba0e3) random.c (568bc4e87033d232c5fd00d5b0cd22a2ccc04944)
1/*
2 * Copyright (C) 2016 Linaro Ltd; <ard.biesheuvel@linaro.org>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
7 *
8 */

--- 129 unchanged lines hidden (view full) ---

138 *addr = target;
139 break;
140 }
141
142 efi_call_early(free_pool, memory_map);
143
144 return status;
145}
1/*
2 * Copyright (C) 2016 Linaro Ltd; <ard.biesheuvel@linaro.org>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
7 *
8 */

--- 129 unchanged lines hidden (view full) ---

138 *addr = target;
139 break;
140 }
141
142 efi_call_early(free_pool, memory_map);
143
144 return status;
145}
146
147#define RANDOM_SEED_SIZE 32
148
149efi_status_t efi_random_get_seed(efi_system_table_t *sys_table_arg)
150{
151 efi_guid_t rng_proto = EFI_RNG_PROTOCOL_GUID;
152 efi_guid_t rng_algo_raw = EFI_RNG_ALGORITHM_RAW;
153 efi_guid_t rng_table_guid = LINUX_EFI_RANDOM_SEED_TABLE_GUID;
154 struct efi_rng_protocol *rng;
155 struct linux_efi_random_seed *seed;
156 efi_status_t status;
157
158 status = efi_call_early(locate_protocol, &rng_proto, NULL,
159 (void **)&rng);
160 if (status != EFI_SUCCESS)
161 return status;
162
163 status = efi_call_early(allocate_pool, EFI_RUNTIME_SERVICES_DATA,
164 sizeof(*seed) + RANDOM_SEED_SIZE,
165 (void **)&seed);
166 if (status != EFI_SUCCESS)
167 return status;
168
169 status = rng->get_rng(rng, &rng_algo_raw, RANDOM_SEED_SIZE,
170 seed->bits);
171 if (status == EFI_UNSUPPORTED)
172 /*
173 * Use whatever algorithm we have available if the raw algorithm
174 * is not implemented.
175 */
176 status = rng->get_rng(rng, NULL, RANDOM_SEED_SIZE,
177 seed->bits);
178
179 if (status != EFI_SUCCESS)
180 goto err_freepool;
181
182 seed->size = RANDOM_SEED_SIZE;
183 status = efi_call_early(install_configuration_table, &rng_table_guid,
184 seed);
185 if (status != EFI_SUCCESS)
186 goto err_freepool;
187
188 return EFI_SUCCESS;
189
190err_freepool:
191 efi_call_early(free_pool, seed);
192 return status;
193}