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 "PolicyCpHash_fp.h" 10 // 11 // 12 // Error Returns Meaning 13 // 14 // TPM_RC_CPHASH cpHash of policySession has previously been set to a different value 15 // TPM_RC_SIZE cpHashA is not the size of a digest produced by the hash algorithm 16 // associated with policySession 17 // 18 TPM_RC 19 TPM2_PolicyCpHash( 20 PolicyCpHash_In *in // IN: input parameter list 21 ) 22 { 23 SESSION *session; 24 TPM_CC commandCode = TPM_CC_PolicyCpHash; 25 HASH_STATE hashState; 26 27 // Input Validation 28 29 // Get pointer to the session structure 30 session = SessionGet(in->policySession); 31 32 // A new cpHash is given in input parameter, but cpHash in session context 33 // is not empty, or is not the same as the new cpHash 34 if( in->cpHashA.t.size != 0 35 && session->u1.cpHash.t.size != 0 36 && !Memory2BEqual(&in->cpHashA.b, &session->u1.cpHash.b) 37 ) 38 return TPM_RC_CPHASH; 39 40 // A valid cpHash must have the same size as session hash digest 41 if(in->cpHashA.t.size != CryptGetHashDigestSize(session->authHashAlg)) 42 return TPM_RC_SIZE + RC_PolicyCpHash_cpHashA; 43 44 // Internal Data Update 45 46 // Update policy hash 47 // policyDigestnew = hash(policyDigestold || TPM_CC_PolicyCpHash || cpHashA) 48 // Start hash 49 CryptStartHash(session->authHashAlg, &hashState); 50 51 // add old digest 52 CryptUpdateDigest2B(&hashState, &session->u2.policyDigest.b); 53 54 // add commandCode 55 CryptUpdateDigestInt(&hashState, sizeof(TPM_CC), &commandCode); 56 57 // add cpHashA 58 CryptUpdateDigest2B(&hashState, &in->cpHashA.b); 59 60 // complete the digest and get the results 61 CryptCompleteHash2B(&hashState, &session->u2.policyDigest.b); 62 63 // update cpHash in session context 64 session->u1.cpHash = in->cpHashA; 65 session->attributes.iscpHashDefined = SET; 66 67 return TPM_RC_SUCCESS; 68 } 69
