SequenceUpdate.c revision 5679752bf24c21135884e987c4077e2f71848971 
1// This file was extracted from the TCG Published
2// Trusted Platform Module Library
3// Part 3: Commands
4// Family "2.0"
5// Level 00 Revision 01.16
6// October 30, 2014
7
8#include "InternalRoutines.h"
9#include "SequenceUpdate_fp.h"
10//
11//
12//     Error Returns                   Meaning
13//
14//     TPM_RC_MODE                     sequenceHandle does not reference a hash or HMAC sequence
15//                                     object
16//
17TPM_RC
18TPM2_SequenceUpdate(
19   SequenceUpdate_In     *in               // IN: input parameter list
20   )
21{
22   OBJECT                      *object;
23
24// Input Validation
25
26   // Get sequence object pointer
27   object = ObjectGet(in->sequenceHandle);
28
29   // Check that referenced object is a sequence object.
30   if(!ObjectIsSequence(object))
31       return TPM_RC_MODE + RC_SequenceUpdate_sequenceHandle;
32
33// Internal Data Update
34
35   if(object->attributes.eventSeq == SET)
36   {
37       // Update event sequence object
38       UINT32           i;
39       HASH_OBJECT     *hashObject = (HASH_OBJECT *)object;
40       for(i = 0; i < HASH_COUNT; i++)
41       {
42           // Update sequence object
43           CryptUpdateDigest2B(&hashObject->state.hashState[i], &in->buffer.b);
44       }
45   }
46   else
47   {
48       HASH_OBJECT     *hashObject = (HASH_OBJECT *)object;
49
50       // Update hash/HMAC sequence object
51       if(hashObject->attributes.hashSeq == SET)
52       {
53           // Is this the first block of the sequence
54           if(hashObject->attributes.firstBlock == CLEAR)
55           {
56               // If so, indicate that first block was received
57               hashObject->attributes.firstBlock = SET;
58
59                // Check the first block to see if the first block can contain
60                // the TPM_GENERATED_VALUE. If it does, it is not safe for
61                // a ticket.
62                if(TicketIsSafe(&in->buffer.b))
63                    hashObject->attributes.ticketSafe = SET;
64            }
65            // Update sequence object hash/HMAC stack
66            CryptUpdateDigest2B(&hashObject->state.hashState[0], &in->buffer.b);
67
68       }
69       else if(object->attributes.hmacSeq == SET)
70       {
71           HASH_OBJECT     *hashObject = (HASH_OBJECT *)object;
72
73            // Update sequence object hash/HMAC stack
74            CryptUpdateDigest2B(&hashObject->state.hmacState, &in->buffer.b);
75       }
76   }
77
78   return TPM_RC_SUCCESS;
79}
80