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 "PolicyNameHash_fp.h" 10 // 11 // 12 // Error Returns Meaning 13 // 14 // TPM_RC_CPHASH nameHash has been previously set to a different value 15 // TPM_RC_SIZE nameHash is not the size of the digest produced by the hash 16 // algorithm associated with policySession 17 // 18 TPM_RC 19 TPM2_PolicyNameHash( 20 PolicyNameHash_In *in // IN: input parameter list 21 ) 22 { 23 SESSION *session; 24 TPM_CC commandCode = TPM_CC_PolicyNameHash; 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 nameHash is given in input parameter, but cpHash in session context 33 // is not empty 34 if(in->nameHash.t.size != 0 && session->u1.cpHash.t.size != 0) 35 return TPM_RC_CPHASH; 36 37 // A valid nameHash must have the same size as session hash digest 38 if(in->nameHash.t.size != CryptGetHashDigestSize(session->authHashAlg)) 39 return TPM_RC_SIZE + RC_PolicyNameHash_nameHash; 40 41 // Internal Data Update 42 43 // Update policy hash 44 // policyDigestnew = hash(policyDigestold || TPM_CC_PolicyNameHash || nameHash) 45 // Start hash 46 CryptStartHash(session->authHashAlg, &hashState); 47 48 // add old digest 49 CryptUpdateDigest2B(&hashState, &session->u2.policyDigest.b); 50 51 // add commandCode 52 CryptUpdateDigestInt(&hashState, sizeof(TPM_CC), &commandCode); 53 54 // add nameHash 55 CryptUpdateDigest2B(&hashState, &in->nameHash.b); 56 57 // complete the digest 58 CryptCompleteHash2B(&hashState, &session->u2.policyDigest.b); 59 60 // clear iscpHashDefined bit to indicate now this field contains a nameHash 61 session->attributes.iscpHashDefined = CLEAR; 62 63 // update nameHash in session context 64 session->u1.cpHash = in->nameHash; 65 66 return TPM_RC_SUCCESS; 67 } 68
