/********************************************************************************/
/*										*/
/*		Signing and Signature Verification	   			*/
/*			     Written by Ken Goldman				*/
/*		       IBM Thomas J. Watson Research Center			*/
/*            $Id: SigningCommands.c 1658 2021-01-22 23:14:01Z kgoldman $	*/
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/********************************************************************************/

#include "Tpm.h"
#include "VerifySignature_fp.h"
#if CC_VerifySignature  // Conditional expansion of this file
TPM_RC
TPM2_VerifySignature(
		     VerifySignature_In      *in,            // IN: input parameter list
		     VerifySignature_Out     *out            // OUT: output parameter list
		     )
{
    TPM_RC                   result;
    OBJECT                  *signObject = HandleToObject(in->keyHandle);
    TPMI_RH_HIERARCHY        hierarchy;
    // Input Validation
    // The object to validate the signature must be a signing key.
    if(!IS_ATTRIBUTE(signObject->publicArea.objectAttributes, TPMA_OBJECT, sign))
	return TPM_RCS_ATTRIBUTES + RC_VerifySignature_keyHandle;
    // Validate Signature.  TPM_RC_SCHEME, TPM_RC_HANDLE or TPM_RC_SIGNATURE
    // error may be returned by CryptCVerifySignatrue()
    result = CryptValidateSignature(in->keyHandle, &in->digest, &in->signature);
    if(result != TPM_RC_SUCCESS)
	return RcSafeAddToResult(result, RC_VerifySignature_signature);
    // Command Output
    hierarchy = GetHieriarchy(in->keyHandle);
    if(hierarchy == TPM_RH_NULL
       || signObject->publicArea.nameAlg == TPM_ALG_NULL)
	{
	    // produce empty ticket if hierarchy is TPM_RH_NULL or nameAlg is
	    // TPM_ALG_NULL
	    out->validation.tag = TPM_ST_VERIFIED;
	    out->validation.hierarchy = TPM_RH_NULL;
	    out->validation.digest.t.size = 0;
	}
    else
	{
	    // Compute ticket
	    TicketComputeVerified(hierarchy, &in->digest, &signObject->name,
				  &out->validation);
	}
    return TPM_RC_SUCCESS;
}
#endif // CC_VerifySignature
#include "Tpm.h"
#include "Sign_fp.h"
#if CC_Sign  // Conditional expansion of this file
#include "Attest_spt_fp.h"
TPM_RC
TPM2_Sign(
	  Sign_In         *in,            // IN: input parameter list
	  Sign_Out        *out            // OUT: output parameter list
	  )
{
    TPM_RC                   result;
    TPMT_TK_HASHCHECK        ticket;
    OBJECT                  *signObject = HandleToObject(in->keyHandle);
    //
    // Input Validation
    if(!IsSigningObject(signObject))
	return TPM_RCS_KEY + RC_Sign_keyHandle;
    
    // A key that will be used for x.509 signatures can't be used in TPM2_Sign().
    if(IS_ATTRIBUTE(signObject->publicArea.objectAttributes, TPMA_OBJECT, x509sign))
	return TPM_RCS_ATTRIBUTES + RC_Sign_keyHandle;

    // pick a scheme for sign.  If the input sign scheme is not compatible with
    // the default scheme, return an error.
    if(!CryptSelectSignScheme(signObject, &in->inScheme))
	return TPM_RCS_SCHEME + RC_Sign_inScheme;
    // If validation is provided, or the key is restricted, check the ticket
    if(in->validation.digest.t.size != 0
       || IS_ATTRIBUTE(signObject->publicArea.objectAttributes, TPMA_OBJECT, restricted))
	{
	    // Compute and compare ticket
	    TicketComputeHashCheck(in->validation.hierarchy,
				   in->inScheme.details.any.hashAlg,
				   &in->digest, &ticket);
	    if(!MemoryEqual2B(&in->validation.digest.b, &ticket.digest.b))
		return TPM_RCS_TICKET + RC_Sign_validation;
	}
    else
	// If we don't have a ticket, at least verify that the provided 'digest'
	// is the size of the scheme hashAlg digest.
	// NOTE: this does not guarantee that the 'digest' is actually produced using
	// the indicated hash algorithm, but at least it might be.
	{
	    if(in->digest.t.size
	       != CryptHashGetDigestSize(in->inScheme.details.any.hashAlg))
		return TPM_RCS_SIZE + RC_Sign_digest;
	}
    // Command Output
    // Sign the hash. A TPM_RC_VALUE or TPM_RC_SCHEME
    // error may be returned at this point
    result = CryptSign(signObject, &in->inScheme, &in->digest, &out->signature);
    return result;
}
#endif // CC_Sign
