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 "ECDH_ZGen_fp.h"
10 #ifdef TPM_ALG_ECC
11 //
12 //
13 // Error Returns Meaning
14 //
15 // TPM_RC_ATTRIBUTES key referenced by keyA is restricted or not a decrypt key
16 // TPM_RC_KEY key referenced by keyA is not an ECC key
17 // TPM_RC_NO_RESULT multiplying inPoint resulted in a point at infinity
18 // TPM_RC_SCHEME the scheme of the key referenced by keyA is not TPM_ALG_NULL,
19 // TPM_ALG_ECDH,
20 //
21 TPM_RC
TPM2_ECDH_ZGen(ECDH_ZGen_In * in,ECDH_ZGen_Out * out)22 TPM2_ECDH_ZGen(
23 ECDH_ZGen_In *in, // IN: input parameter list
24 ECDH_ZGen_Out *out // OUT: output parameter list
25 )
26 {
27 TPM_RC result;
28 OBJECT *eccKey;
29
30 // Input Validation
31
32 eccKey = ObjectGet(in->keyHandle);
33
34 // Input key must be a non-restricted, decrypt ECC key
35 if( eccKey->publicArea.type != TPM_ALG_ECC)
36 return TPM_RC_KEY + RC_ECDH_ZGen_keyHandle;
37
38 if( eccKey->publicArea.objectAttributes.restricted == SET
39 || eccKey->publicArea.objectAttributes.decrypt != SET
40 )
41 return TPM_RC_ATTRIBUTES + RC_ECDH_ZGen_keyHandle;
42
43 // Make sure the scheme allows this use
44 if( eccKey->publicArea.parameters.eccDetail.scheme.scheme != TPM_ALG_ECDH
45 && eccKey->publicArea.parameters.eccDetail.scheme.scheme != TPM_ALG_NULL)
46 return TPM_RC_SCHEME + RC_ECDH_ZGen_keyHandle;
47
48 // Command Output
49
50 // Compute Z. TPM_RC_ECC_POINT or TPM_RC_NO_RESULT may be returned here.
51 result = CryptEccPointMultiply(&out->outPoint.t.point,
52 eccKey->publicArea.parameters.eccDetail.curveID,
53 &eccKey->sensitive.sensitive.ecc,
54 &in->inPoint.t.point);
55 if(result != TPM_RC_SUCCESS)
56 return RcSafeAddToResult(result, RC_ECDH_ZGen_inPoint);
57
58 out->outPoint.t.size = TPMS_ECC_POINT_Marshal(&out->outPoint.t.point,
59 NULL, NULL);
60
61 return TPM_RC_SUCCESS;
62 }
63 #endif
64