1 /*
2 * Copyright (c) 2017, Linaro Limited
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright notice,
9 * this list of conditions and the following disclaimer.
10 *
11 * 2. Redistributions in binary form must reproduce the above copyright notice,
12 * this list of conditions and the following disclaimer in the documentation
13 * and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
16 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
19 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
20 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
21 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
22 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
23 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
24 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
25 * POSSIBILITY OF SUCH DAMAGE.
26 */
27
28 #include <tee_internal_api.h>
29 #include <tee_internal_api_extensions.h>
30
31 #include <random_ta.h>
32
TA_CreateEntryPoint(void)33 TEE_Result TA_CreateEntryPoint(void)
34 {
35 return TEE_SUCCESS;
36 }
37
TA_DestroyEntryPoint(void)38 void TA_DestroyEntryPoint(void)
39 {
40 }
41
TA_OpenSessionEntryPoint(uint32_t param_types,TEE_Param __maybe_unused params[4],void __maybe_unused ** sess_ctx)42 TEE_Result TA_OpenSessionEntryPoint(uint32_t param_types,
43 TEE_Param __maybe_unused params[4],
44 void __maybe_unused **sess_ctx)
45 {
46 uint32_t exp_param_types = TEE_PARAM_TYPES(TEE_PARAM_TYPE_NONE,
47 TEE_PARAM_TYPE_NONE,
48 TEE_PARAM_TYPE_NONE,
49 TEE_PARAM_TYPE_NONE);
50 if (param_types != exp_param_types)
51 return TEE_ERROR_BAD_PARAMETERS;
52
53 (void)¶ms;
54 (void)&sess_ctx;
55
56 return TEE_SUCCESS;
57 }
58
TA_CloseSessionEntryPoint(void __maybe_unused * sess_ctx)59 void TA_CloseSessionEntryPoint(void __maybe_unused *sess_ctx)
60 {
61 (void)&sess_ctx;
62 }
63
random_number_generate(uint32_t param_types,TEE_Param params[4])64 static TEE_Result random_number_generate(uint32_t param_types,
65 TEE_Param params[4])
66 {
67 uint32_t exp_param_types =
68 TEE_PARAM_TYPES(TEE_PARAM_TYPE_MEMREF_OUTPUT,
69 TEE_PARAM_TYPE_NONE,
70 TEE_PARAM_TYPE_NONE,
71 TEE_PARAM_TYPE_NONE);
72 void *buf = NULL;
73
74 DMSG("has been called");
75 if (param_types != exp_param_types)
76 return TEE_ERROR_BAD_PARAMETERS;
77
78 buf = TEE_Malloc(params[0].memref.size, 0);
79 if (!buf)
80 return TEE_ERROR_OUT_OF_MEMORY;
81 IMSG("Generating random data over %u bytes.", params[0].memref.size);
82 /*
83 * The TEE_GenerateRandom function is a part of TEE Internal Core API,
84 * which generates random data
85 *
86 * Parameters:
87 * @ randomBuffer : Reference to generated random data
88 * @ randomBufferLen : Byte length of requested random data
89 */
90 TEE_GenerateRandom(buf, params[0].memref.size);
91 TEE_MemMove(params[0].memref.buffer, buf, params[0].memref.size);
92 TEE_Free(buf);
93
94 return TEE_SUCCESS;
95 }
96
TA_InvokeCommandEntryPoint(void __maybe_unused * sess_ctx,uint32_t cmd_id,uint32_t param_types,TEE_Param params[4])97 TEE_Result TA_InvokeCommandEntryPoint(void __maybe_unused *sess_ctx,
98 uint32_t cmd_id,
99 uint32_t param_types, TEE_Param params[4])
100 {
101 (void)&sess_ctx;
102
103 switch (cmd_id) {
104 case TA_RANDOM_CMD_GENERATE:
105 return random_number_generate(param_types, params);
106 default:
107 return TEE_ERROR_BAD_PARAMETERS;
108 }
109 }
110