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 "MAC_Start_fp.h"
37
38 #if CC_MAC_Start // Conditional expansion of this file
39
40 /*(See part 3 specification)
41 // Initialize a HMAC sequence and create a sequence object
42 */
43 // Return Type: TPM_RC
44 // TPM_RC_ATTRIBUTES key referenced by 'handle' is not a signing key
45 // or is restricted
46 // TPM_RC_OBJECT_MEMORY no space to create an internal object
47 // TPM_RC_KEY key referenced by 'handle' is not an HMAC key
48 // TPM_RC_VALUE 'hashAlg' is not compatible with the hash algorithm
49 // of the scheme of the object referenced by 'handle'
50 TPM_RC
TPM2_MAC_Start(MAC_Start_In * in,MAC_Start_Out * out)51 TPM2_MAC_Start(
52 MAC_Start_In *in, // IN: input parameter list
53 MAC_Start_Out *out // OUT: output parameter list
54 )
55 {
56 OBJECT *keyObject;
57 TPMT_PUBLIC *publicArea;
58 TPM_RC result;
59
60 // Input Validation
61
62 // Get HMAC key object and public area pointers
63 keyObject = HandleToObject(in->handle);
64 publicArea = &keyObject->publicArea;
65
66 // Make sure that the key can do what is required
67 result = CryptSelectMac(publicArea, &in->inScheme);
68 // If the key is not able to do a MAC, indicate that the handle selects an
69 // object that can't do a MAC
70 if(result == TPM_RCS_TYPE)
71 return TPM_RCS_TYPE + RC_MAC_Start_handle;
72 // If there is another error type, indicate that the scheme and key are not
73 // compatible
74 if(result != TPM_RC_SUCCESS)
75 return RcSafeAddToResult(result, RC_MAC_Start_inScheme);
76 // Make sure that the key is not restricted
77 if(IS_ATTRIBUTE(publicArea->objectAttributes, TPMA_OBJECT, restricted))
78 return TPM_RCS_ATTRIBUTES + RC_MAC_Start_handle;
79 // and that it is a signing key
80 if(!IS_ATTRIBUTE(publicArea->objectAttributes, TPMA_OBJECT, sign))
81 return TPM_RCS_KEY + RC_MAC_Start_handle;
82
83 // Internal Data Update
84 // Create a HMAC sequence object. A TPM_RC_OBJECT_MEMORY error may be
85 // returned at this point
86 return ObjectCreateHMACSequence(in->inScheme,
87 keyObject,
88 &in->auth,
89 &out->sequenceHandle);
90 }
91
92 #endif // CC_MAC_Start