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 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
