1 /*
2 * Copyright (c) 2016, 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 <err.h>
29 #include <stdio.h>
30 #include <string.h>
31
32 /* OP-TEE TEE client API (built by optee_client) */
33 #include <tee_client_api.h>
34
35 /* For the UUID (found in the TA's h-file(s)) */
36 #include <random_ta.h>
37
main(void)38 int main(void)
39 {
40 TEEC_Result res;
41 TEEC_Context ctx;
42 TEEC_Session sess;
43 TEEC_Operation op = { 0 };
44 TEEC_UUID uuid = TA_RANDOM_UUID;
45 uint8_t random_uuid[16] = { 0 };
46 uint32_t err_origin;
47 int i;
48
49 /* Initialize a context connecting us to the TEE */
50 res = TEEC_InitializeContext(NULL, &ctx);
51 if (res != TEEC_SUCCESS)
52 errx(1, "TEEC_InitializeContext failed with code 0x%x", res);
53
54 /*
55 * Open a session to the Random example TA, the TA will print "hello
56 * world!" in the log when the session is created.
57 */
58 res = TEEC_OpenSession(&ctx, &sess, &uuid,
59 TEEC_LOGIN_PUBLIC, NULL, NULL, &err_origin);
60 if (res != TEEC_SUCCESS)
61 errx(1, "TEEC_Opensession failed with code 0x%x origin 0x%x",
62 res, err_origin);
63
64 /*
65 * Execute a function in the TA by invoking it, in this case
66 * we're incrementing a number.
67 *
68 * The value of command ID part and how the parameters are
69 * interpreted is part of the interface provided by the TA.
70 */
71
72 /* Clear the TEEC_Operation struct */
73 memset(&op, 0, sizeof(op));
74
75 /*
76 * Prepare the argument. Pass a value in the first parameter,
77 * the remaining three parameters are unused.
78 */
79 op.paramTypes = TEEC_PARAM_TYPES(TEEC_MEMREF_TEMP_OUTPUT,
80 TEEC_NONE, TEEC_NONE, TEEC_NONE);
81 op.params[0].tmpref.buffer = random_uuid;
82 op.params[0].tmpref.size = sizeof(random_uuid);
83
84 /*
85 * TA_EXAMPLE_RANDOM_GENERATE is the actual function in the TA to be
86 * called.
87 */
88 printf("Invoking TA to generate random UUID... \n");
89 res = TEEC_InvokeCommand(&sess, TA_RANDOM_CMD_GENERATE,
90 &op, &err_origin);
91 if (res != TEEC_SUCCESS)
92 errx(1, "TEEC_InvokeCommand failed with code 0x%x origin 0x%x",
93 res, err_origin);
94
95 printf("TA generated UUID value = 0x");
96 for (i = 0; i < 16; i++)
97 printf("%x", random_uuid[i]);
98 printf("\n");
99
100 /*
101 * We're done with the TA, close the session and
102 * destroy the context.
103 *
104 * The TA will print "Goodbye!" in the log when the
105 * session is closed.
106 */
107
108 TEEC_CloseSession(&sess);
109
110 TEEC_FinalizeContext(&ctx);
111
112 return 0;
113 }
114