1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
|
/********************************************************************************/
/* */
/* Ephemeral EC Keys */
/* Written by Ken Goldman */
/* IBM Thomas J. Watson Research Center */
/* $Id: EphemeralCommands.c 1490 2019-07-26 21:13:22Z kgoldman $ */
/* */
/* Licenses and Notices */
/* */
/* 1. Copyright Licenses: */
/* */
/* - Trusted Computing Group (TCG) grants to the user of the source code in */
/* this specification (the "Source Code") a worldwide, irrevocable, */
/* nonexclusive, royalty free, copyright license to reproduce, create */
/* derivative works, distribute, display and perform the Source Code and */
/* derivative works thereof, and to grant others the rights granted herein. */
/* */
/* - The TCG grants to the user of the other parts of the specification */
/* (other than the Source Code) the rights to reproduce, distribute, */
/* display, and perform the specification solely for the purpose of */
/* developing products based on such documents. */
/* */
/* 2. Source Code Distribution Conditions: */
/* */
/* - Redistributions of Source Code must retain the above copyright licenses, */
/* this list of conditions and the following disclaimers. */
/* */
/* - Redistributions in binary form must reproduce the above copyright */
/* licenses, this list of conditions and the following disclaimers in the */
/* documentation and/or other materials provided with the distribution. */
/* */
/* 3. Disclaimers: */
/* */
/* - THE COPYRIGHT LICENSES SET FORTH ABOVE DO NOT REPRESENT ANY FORM OF */
/* LICENSE OR WAIVER, EXPRESS OR IMPLIED, BY ESTOPPEL OR OTHERWISE, WITH */
/* RESPECT TO PATENT RIGHTS HELD BY TCG MEMBERS (OR OTHER THIRD PARTIES) */
/* THAT MAY BE NECESSARY TO IMPLEMENT THIS SPECIFICATION OR OTHERWISE. */
/* Contact TCG Administration (admin@trustedcomputinggroup.org) for */
/* information on specification licensing rights available through TCG */
/* membership agreements. */
/* */
/* - THIS SPECIFICATION IS PROVIDED "AS IS" WITH NO EXPRESS OR IMPLIED */
/* WARRANTIES WHATSOEVER, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR */
/* FITNESS FOR A PARTICULAR PURPOSE, ACCURACY, COMPLETENESS, OR */
/* NONINFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS, OR ANY WARRANTY */
/* OTHERWISE ARISING OUT OF ANY PROPOSAL, SPECIFICATION OR SAMPLE. */
/* */
/* - Without limitation, TCG and its members and licensors disclaim all */
/* liability, including liability for infringement of any proprietary */
/* rights, relating to use of information in this specification and to the */
/* implementation of this specification, and TCG disclaims all liability for */
/* cost of procurement of substitute goods or services, lost profits, loss */
/* of use, loss of data or any incidental, consequential, direct, indirect, */
/* or special damages, whether under contract, tort, warranty or otherwise, */
/* arising in any way out of use or reliance upon this specification or any */
/* information herein. */
/* */
/* (c) Copyright IBM Corp. and others, 2016 - 2019 */
/* */
/********************************************************************************/
#include "Tpm.h"
#include "Commit_fp.h"
#if CC_Commit // Conditional expansion of this file
TPM_RC
TPM2_Commit(
Commit_In *in, // IN: input parameter list
Commit_Out *out // OUT: output parameter list
)
{
OBJECT *eccKey;
TPMS_ECC_POINT P2;
TPMS_ECC_POINT *pP2 = NULL;
TPMS_ECC_POINT *pP1 = NULL;
TPM2B_ECC_PARAMETER r;
TPM2B_ECC_PARAMETER p;
TPM_RC result;
TPMS_ECC_PARMS *parms;
// Input Validation
eccKey = HandleToObject(in->signHandle);
parms = &eccKey->publicArea.parameters.eccDetail;
// Input key must be an ECC key
if(eccKey->publicArea.type != TPM_ALG_ECC)
return TPM_RCS_KEY + RC_Commit_signHandle;
// This command may only be used with a sign-only key using an anonymous
// scheme.
// NOTE: a sign + decrypt key has no scheme so it will not be an anonymous one
// and an unrestricted sign key might no have a signing scheme but it can't
// be use in Commit()
if(!CryptIsSchemeAnonymous(parms->scheme.scheme))
return TPM_RCS_SCHEME + RC_Commit_signHandle;
// Make sure that both parts of P2 are present if either is present
if((in->s2.t.size == 0) != (in->y2.t.size == 0))
return TPM_RCS_SIZE + RC_Commit_y2;
// Get prime modulus for the curve. This is needed later but getting this now
// allows confirmation that the curve exists.
if(!CryptEccGetParameter(&p, 'p', parms->curveID))
return TPM_RCS_KEY + RC_Commit_signHandle;
// Get the random value that will be used in the point multiplications
// Note: this does not commit the count.
if(!CryptGenerateR(&r, NULL, parms->curveID, &eccKey->name))
return TPM_RC_NO_RESULT;
// Set up P2 if s2 and Y2 are provided
if(in->s2.t.size != 0)
{
TPM2B_DIGEST x2;
pP2 = &P2;
// copy y2 for P2
P2.y = in->y2;
// Compute x2 HnameAlg(s2) mod p
// do the hash operation on s2 with the size of curve 'p'
x2.t.size = CryptHashBlock(eccKey->publicArea.nameAlg,
in->s2.t.size,
in->s2.t.buffer,
sizeof(x2.t.buffer),
x2.t.buffer);
// If there were error returns in the hash routine, indicate a problem
// with the hash algorithm selection
if(x2.t.size == 0)
return TPM_RCS_HASH + RC_Commit_signHandle;
// The size of the remainder will be same as the size of p. DivideB() will
// pad the results (leading zeros) if necessary to make the size the same
P2.x.t.size = p.t.size;
// set p2.x = hash(s2) mod p
if(DivideB(&x2.b, &p.b, NULL, &P2.x.b) != TPM_RC_SUCCESS)
return TPM_RC_NO_RESULT;
if(!CryptEccIsPointOnCurve(parms->curveID, pP2))
return TPM_RCS_ECC_POINT + RC_Commit_s2;
if(eccKey->attributes.publicOnly == SET)
return TPM_RCS_KEY + RC_Commit_signHandle;
}
// If there is a P1, make sure that it is on the curve
// NOTE: an "empty" point has two UINT16 values which are the size values
// for each of the coordinates.
if(in->P1.size > 4)
{
pP1 = &in->P1.point;
if(!CryptEccIsPointOnCurve(parms->curveID, pP1))
return TPM_RCS_ECC_POINT + RC_Commit_P1;
}
// Pass the parameters to CryptCommit.
// The work is not done in-line because it does several point multiplies
// with the same curve. It saves work by not having to reload the curve
// parameters multiple times.
result = CryptEccCommitCompute(&out->K.point,
&out->L.point,
&out->E.point,
parms->curveID,
pP1,
pP2,
&eccKey->sensitive.sensitive.ecc,
&r);
if(result != TPM_RC_SUCCESS)
return result;
// The commit computation was successful so complete the commit by setting
// the bit
out->counter = CryptCommit();
return TPM_RC_SUCCESS;
}
#endif // CC_Commit
#include "Tpm.h"
#include "EC_Ephemeral_fp.h"
#if CC_EC_Ephemeral // Conditional expansion of this file
TPM_RC
TPM2_EC_Ephemeral(
EC_Ephemeral_In *in, // IN: input parameter list
EC_Ephemeral_Out *out // OUT: output parameter list
)
{
TPM2B_ECC_PARAMETER r;
TPM_RC result;
//
do
{
// Get the random value that will be used in the point multiplications
// Note: this does not commit the count.
if(!CryptGenerateR(&r, NULL, in->curveID, NULL))
return TPM_RC_NO_RESULT;
// do a point multiply
result = CryptEccPointMultiply(&out->Q.point, in->curveID, NULL, &r,
NULL, NULL);
// commit the count value if either the r value results in the point at
// infinity or if the value is good. The commit on the r value for infinity
// is so that the r value will be skipped.
if((result == TPM_RC_SUCCESS) || (result == TPM_RC_NO_RESULT))
out->counter = CryptCommit();
} while(result == TPM_RC_NO_RESULT);
return TPM_RC_SUCCESS;
}
#endif // CC_EC_Ephemeral
|