1 /* Microsoft Reference Implementation for TPM 2.0
2 *
3 * The copyright in this software is being made available under the BSD License,
4 * included below. This software may be subject to other third party and
5 * contributor rights, including patent rights, and no such rights are granted
6 * under this license.
7 *
8 * Copyright (c) Microsoft Corporation
9 *
10 * All rights reserved.
11 *
12 * BSD License
13 *
14 * Redistribution and use in source and binary forms, with or without modification,
15 * are permitted provided that the following conditions are met:
16 *
17 * Redistributions of source code must retain the above copyright notice, this list
18 * of conditions and the following disclaimer.
19 *
20 * Redistributions in binary form must reproduce the above copyright notice, this
21 * list of conditions and the following disclaimer in the documentation and/or
22 * other materials provided with the distribution.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ""AS IS""
25 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
27 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
28 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
29 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
30 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
31 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
32 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
33 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34 */
35 #include "Tpm.h"
36 #include "GetRandom_fp.h"
37
38 #if CC_GetRandom // Conditional expansion of this file
39
40 /*(See part 3 specification)
41 // random number generator
42 */
43 TPM_RC
TPM2_GetRandom(GetRandom_In * in,GetRandom_Out * out)44 TPM2_GetRandom(
45 GetRandom_In *in, // IN: input parameter list
46 GetRandom_Out *out // OUT: output parameter list
47 )
48 {
49 // Command Output
50
51 // if the requested bytes exceed the output buffer size, generates the
52 // maximum bytes that the output buffer allows
53 if(in->bytesRequested > sizeof(TPMU_HA))
54 out->randomBytes.t.size = sizeof(TPMU_HA);
55 else
56 out->randomBytes.t.size = in->bytesRequested;
57
58 CryptRandomGenerate(out->randomBytes.t.size, out->randomBytes.t.buffer);
59
60 return TPM_RC_SUCCESS;
61 }
62
63 #endif // CC_GetRandom