uint32_t TPM_GetCapabilityOwner(unsigned char *ownpass,
uint32_t * volflags, uint32_t * nvolflags)
{
uint32_t ret;
STACK_TPM_BUFFER(tpmdata)
/* data to be inserted into Request Buffer (in Network Byte Order) */
/* the uint32_t and uint16_t values are stored in network byte order so they
** are in the correct format when being hashed by the HMAC calculation */
uint32_t command; /* command ordinal */
unsigned char nonceodd[TPM_HASH_SIZE]; /* odd nonce */
unsigned char authdata[TPM_HASH_SIZE]; /* auth data */
session sess;
/* check that parameters are valid */
if (ownpass == NULL || volflags == NULL || nvolflags == NULL)
return ERR_NULL_ARG;
/* set up command and protocol values for TakeOwnership function */
command = htonl(TPM_ORD_GetCapabilityOwner);
/* generate the odd nonce */
ret = TSS_gennonce(nonceodd);
if (ret == 0)
return ret;
/* initiate the OSAP protocol */
ret = TSS_SessionOpen(SESSION_OSAP, &sess, ownpass, TPM_OWNER_ETYPE,
TPM_OWNER_EVALUE);
if (ret)
return ret;
/* calculate the Authorization Data */
ret = TSS_authhmac(authdata, TSS_Session_GetAuth(&sess), TPM_HASH_SIZE,
TSS_Session_GetENonce(&sess), nonceodd, 0,
TPM_U32_SIZE, &command, 0, 0);
if (ret) {
TSS_SessionClose(&sess);
return ret;
}
/* insert all the calculated fields into the request buffer */
ret = TSS_buildbuff("00 c2 T l L % 00 %", &tpmdata,
command,
TSS_Session_GetHandle(&sess),
TPM_HASH_SIZE, nonceodd, TPM_HASH_SIZE, authdata);
if (ret & ERR_MASK) {
TSS_SessionClose(&sess);
return ret;
}
/* transmit the request buffer to the TPM device and read the reply */
ret = TPM_Transmit(&tpmdata, "GetCapabilityOwner");
TSS_SessionClose(&sess);
if (ret)
return ret;
ret = TSS_checkhmac1(&tpmdata, command, nonceodd,
TSS_Session_GetAuth(&sess), TPM_HASH_SIZE,
TPM_U32_SIZE, TPM_DATA_OFFSET, TPM_U32_SIZE,
TPM_DATA_OFFSET + TPM_U32_SIZE, TPM_U32_SIZE,
TPM_DATA_OFFSET + TPM_U32_SIZE + TPM_U32_SIZE, 0,
0);
if (ret)
return ret;
ret = tpm_buffer_load32(&tpmdata, TPM_DATA_OFFSET + 4, nvolflags);
if (ret & ERR_MASK)
return ret;
ret = tpm_buffer_load32(&tpmdata, TPM_DATA_OFFSET + 4 + TPM_U32_SIZE,
volflags);
if (ret & ERR_MASK)
return ret;
return 0;
}
uint32_t TPM_GetCapabilitySigned(uint32_t keyhandle,
unsigned char *keypass,
unsigned char *antiReplay,
uint32_t caparea,
struct tpm_buffer * scap,
struct tpm_buffer * resp,
unsigned char *sig, uint32_t * siglen)
{
uint32_t ret;
uint32_t rlen;
STACK_TPM_BUFFER(tpmdata) /* request/response buffer */
uint32_t ordinal_no = htonl(TPM_ORD_GetCapabilitySigned);
uint32_t keyhandle_no = htonl(keyhandle);
uint32_t caparea_no = htonl(caparea);
unsigned char c = 0;
unsigned char authdata[TPM_HASH_SIZE];
uint32_t ssize;
unsigned char *buffer = NULL;
uint32_t subcaplen = 0;
uint32_t subcaplen_no;
/* check arguments */
if (scap) {
subcaplen = scap->used;
buffer = scap->buffer;
}
subcaplen_no = htonl(subcaplen);
ret = needKeysRoom(keyhandle, 0, 0, 0);
if (ret)
return ret;
if (resp == NULL)
return ERR_NULL_ARG;
if (keypass) {
unsigned char nonceodd[TPM_HASH_SIZE];
session sess;
ret = TSS_gennonce(nonceodd);
if (ret == 0)
return ERR_CRYPT_ERR;
ret = TSS_SessionOpen(SESSION_OSAP | SESSION_OIAP,
&sess, keypass, TPM_ET_KEYHANDLE, keyhandle);
if (ret)
return ret;
/* move Network byte order data to variable for hmac calculation */
ret = TSS_authhmac(authdata, TSS_Session_GetAuth(&sess),
TPM_HASH_SIZE, TSS_Session_GetENonce(&sess),
nonceodd, c, TPM_U32_SIZE, &ordinal_no,
TPM_NONCE_SIZE, antiReplay, TPM_U32_SIZE,
&caparea_no, TPM_U32_SIZE, &subcaplen_no,
subcaplen, buffer, 0, 0);
if (ret) {
TSS_SessionClose(&sess);
return ret;
}
ret = TSS_buildbuff("00 c2 T l l % l @ L % o %", &tpmdata,
ordinal_no,
keyhandle_no,
TPM_NONCE_SIZE, antiReplay,
caparea_no,
subcaplen, buffer,
TSS_Session_GetHandle(&sess),
TPM_NONCE_SIZE, nonceodd,
c, TPM_HASH_SIZE, authdata);
if (ret & ERR_MASK) {
TSS_SessionClose(&sess);
return ret;
}
/* transmit the request buffer to the TPM device and read the reply */
ret = TPM_Transmit(&tpmdata, "GetCapability - AUTH1");
TSS_SessionClose(&sess);
if (ret)
return ret;
ret = tpm_buffer_load32(&tpmdata, TPM_DATA_OFFSET+TPM_U32_SIZE, &rlen);
if (ret & ERR_MASK)
return ret;
ret = tpm_buffer_load32(&tpmdata,
TPM_DATA_OFFSET + TPM_U32_SIZE +
TPM_U32_SIZE + rlen, &ssize);
if (ret & ERR_MASK)
return ret;
ret = TSS_checkhmac1(&tpmdata, ordinal_no, nonceodd,
TSS_Session_GetAuth(&sess), TPM_HASH_SIZE,
TPM_U32_SIZE + TPM_U32_SIZE + rlen +
TPM_U32_SIZE + ssize, TPM_DATA_OFFSET, 0, 0);
if (ret)
return ret;
} else {
ret = TSS_buildbuff("00 c1 T l l % l @", &tpmdata,
ordinal_no,
keyhandle_no,
TPM_NONCE_SIZE, antiReplay,
caparea_no, subcaplen, buffer);
if (ret & ERR_MASK)
return ret;
/* transmit the request buffer to the TPM device and read the reply */
ret = TPM_Transmit(&tpmdata, "GetCapability - NO AUTH");
if (ret)
return ret;
ret = tpm_buffer_load32(&tpmdata, TPM_DATA_OFFSET+TPM_U32_SIZE, &rlen);
if (ret & ERR_MASK)
return ret;
ret = tpm_buffer_load32(&tpmdata,
TPM_DATA_OFFSET + TPM_U32_SIZE +
TPM_U32_SIZE + rlen, &ssize);
if (ret & ERR_MASK)
return ret;
}
if (resp)
SET_TPM_BUFFER(resp,
&tpmdata.buffer[TPM_DATA_OFFSET + TPM_U32_SIZE +
TPM_U32_SIZE], rlen);
if (sig) {
*siglen = MIN(*siglen, ssize);
memcpy(sig,
&tpmdata.buffer[TPM_DATA_OFFSET + TPM_U32_SIZE +
TPM_U32_SIZE + rlen + TPM_U32_SIZE],
*siglen);
}
return ret;
}
uint32_t TPM_DirWriteAuth(uint32_t dirIndex,
unsigned char * newValue,
unsigned char * ownerAuth)
{
STACK_TPM_BUFFER(tpmdata)
uint32_t ordinal_no = htonl(TPM_ORD_DirWriteAuth);
uint32_t ret;
uint32_t dirIndex_no = htonl(dirIndex);
unsigned char nonceodd[TPM_NONCE_SIZE];
unsigned char authdata[TPM_NONCE_SIZE];
session sess;
int c = 0;
/* check input arguments */
if (NULL == ownerAuth ||
NULL == newValue) {
return ERR_NULL_ARG;
}
/* Open OSAP Session */
ret = TSS_SessionOpen(SESSION_DSAP | SESSION_OSAP | SESSION_OIAP,
&sess,
ownerAuth, TPM_ET_OWNER, 0);
if (ret != 0)
return ret;
/* generate odd nonce */
ret = TSS_gennonce(nonceodd);
if (0 == ret)
return ERR_CRYPT_ERR;
/* move Network byte order data to varaible for hmac calcualtion */
ret = TSS_authhmac(authdata,TSS_Session_GetAuth(&sess),TPM_HASH_SIZE,TSS_Session_GetENonce(&sess),nonceodd,c,
TPM_U32_SIZE,&ordinal_no,
TPM_U32_SIZE,&dirIndex_no,
TPM_HASH_SIZE, newValue,
0,0);
if (0 != ret) {
TSS_SessionClose(&sess);
return ret;
}
/* build the request buffer */
ret = TSS_buildbuff("00 c2 T l l % L % o %", &tpmdata,
ordinal_no,
dirIndex_no,
TPM_HASH_SIZE, newValue,
TSS_Session_GetHandle(&sess),
TPM_HASH_SIZE, nonceodd,
c,
TPM_HASH_SIZE, authdata);
if ((ret & ERR_MASK)) {
TSS_SessionClose(&sess);
return ret;
}
/* transmit the request buffer to the TPM device and read the reply */
ret = TPM_Transmit(&tpmdata,"DirWriteAuth");
TSS_SessionClose(&sess);
if (ret != 0) {
return ret;
}
/* check the HMAC in the response */
ret = TSS_checkhmac1(&tpmdata,ordinal_no,nonceodd,TSS_Session_GetAuth(&sess),TPM_HASH_SIZE,
0,0);
return ret;
}
uint32_t TPM_Quote2(uint32_t keyhandle,
TPM_PCR_SELECTION * selection,
TPM_BOOL addVersion,
unsigned char *keyauth,
unsigned char *antiReplay,
TPM_PCR_INFO_SHORT * pcrinfo,
struct tpm_buffer *versionblob,
struct tpm_buffer *signature)
{
uint32_t ret;
uint32_t rc;
STACK_TPM_BUFFER( tpmdata )
session sess;
unsigned char pubauth[TPM_HASH_SIZE];
unsigned char nonceodd[TPM_NONCE_SIZE];
unsigned char c = 0;
uint32_t ordinal_no = htonl(TPM_ORD_Quote2);
uint16_t pcrselsize;
uint32_t verinfosize;
uint32_t sigsize;
uint32_t storedsize;
uint32_t keyhndl = htonl(keyhandle);
uint16_t keytype;
struct tpm_buffer * serPCRSelection;
uint32_t serPCRSelectionSize;
/* check input arguments */
if (pcrinfo == NULL ||
selection == NULL ||
antiReplay == NULL) return ERR_NULL_ARG;
keytype = 0x0001;
ret = needKeysRoom(keyhandle, 0, 0, 0);
if (ret != 0) {
return ret;
}
TSS_gennonce(antiReplay);
serPCRSelection = TSS_AllocTPMBuffer(TPM_U16_SIZE +
selection->sizeOfSelect);
if (NULL == serPCRSelection) {
return ERR_MEM_ERR;
}
ret = TPM_WritePCRSelection(serPCRSelection, selection);
if (( ret & ERR_MASK) != 0) {
TSS_FreeTPMBuffer(serPCRSelection);
return ret;
}
serPCRSelectionSize = ret;
if (keyauth != NULL) {
/* Open OSAP Session */
ret = TSS_SessionOpen(SESSION_OSAP|SESSION_DSAP,&sess,keyauth,keytype,keyhandle);
if (ret != 0) {
TSS_FreeTPMBuffer(serPCRSelection);
return ret;
}
/* generate odd nonce */
TSS_gennonce(nonceodd);
/* move Network byte order data to variables for hmac calculation */
/* calculate authorization HMAC value */
ret = TSS_authhmac(pubauth,TSS_Session_GetAuth(&sess),TPM_HASH_SIZE,TSS_Session_GetENonce(&sess),nonceodd,c,
TPM_U32_SIZE,&ordinal_no,
TPM_HASH_SIZE,antiReplay,
serPCRSelectionSize, serPCRSelection->buffer,
sizeof(TPM_BOOL), &addVersion,
0,0);
if (ret != 0) {
TSS_FreeTPMBuffer(serPCRSelection);
TSS_SessionClose(&sess);
return ret;
}
/* build the request buffer */
ret = TSS_buildbuff("00 C2 T l l % % o L % o %",&tpmdata,
ordinal_no,
keyhndl,
TPM_HASH_SIZE,antiReplay,
serPCRSelectionSize,serPCRSelection->buffer,
addVersion,
TSS_Session_GetHandle(&sess),
TPM_NONCE_SIZE,nonceodd,
c,
TPM_HASH_SIZE,pubauth);
TSS_FreeTPMBuffer(serPCRSelection);
if ((ret & ERR_MASK) != 0) {
TSS_SessionClose(&sess);
return ret;
}
/* transmit the request buffer to the TPM device and read the reply */
ret = TPM_Transmit(&tpmdata,"Quote2 - AUTH1");
TSS_SessionClose(&sess);
if (ret != 0) {
return ret;
}
} else {
/* build the request buffer */
ret = TSS_buildbuff("00 C1 T l l % % o",&tpmdata,
ordinal_no,
keyhndl,
TPM_HASH_SIZE,antiReplay,
serPCRSelectionSize,serPCRSelection->buffer,
addVersion);
TSS_FreeTPMBuffer(serPCRSelection);
if ((ret & ERR_MASK) != 0) {
TSS_SessionClose(&sess);
return ret;
}
/* transmit the request buffer to the TPM device and read the reply */
ret = TPM_Transmit(&tpmdata,"Quote2");
TSS_SessionClose(&sess);
if (ret != 0) {
return ret;
}
}
/* calculate the size of the returned Blob */
ret = tpm_buffer_load16(&tpmdata,TPM_DATA_OFFSET, &pcrselsize);
if ((ret & ERR_MASK)) {
return ret;
}
pcrselsize += TPM_U16_SIZE + 1 + TPM_HASH_SIZE;
ret = tpm_buffer_load32(&tpmdata, TPM_DATA_OFFSET + pcrselsize, &verinfosize);
if ((ret & ERR_MASK)) {
return ret;
}
ret = tpm_buffer_load32(&tpmdata, TPM_DATA_OFFSET + pcrselsize + TPM_U32_SIZE + verinfosize, &sigsize);
if ((ret & ERR_MASK)) {
return ret;
}
storedsize = pcrselsize + TPM_U32_SIZE + verinfosize +
TPM_U32_SIZE + sigsize;
if (keyauth != NULL) {
/* check the HMAC in the response */
ret = TSS_checkhmac1(&tpmdata,ordinal_no,nonceodd,TSS_Session_GetAuth(&sess),TPM_HASH_SIZE,
storedsize,TPM_DATA_OFFSET,
0,0);
if (ret != 0) {
return ret;
}
}
/* copy the returned PCR composite to caller */
if (pcrselsize != (rc =
TPM_ReadPCRInfoShort(&tpmdata, TPM_DATA_OFFSET,
pcrinfo))) {
if ((rc & ERR_MASK))
return rc;
return ERR_BUFFER;
}
if (NULL != versionblob) {
SET_TPM_BUFFER(
versionblob,
&tpmdata.buffer[TPM_DATA_OFFSET+pcrselsize+TPM_U32_SIZE],
verinfosize);
}
if (NULL != signature) {
SET_TPM_BUFFER(signature,
&tpmdata.buffer[TPM_DATA_OFFSET+pcrselsize+TPM_U32_SIZE+verinfosize+TPM_U32_SIZE],
sigsize);
}
return ret;
}
uint32_t TPM_Quote(uint32_t keyhandle,
unsigned char *keyauth,
unsigned char *externalData,
TPM_PCR_SELECTION *tps,
TPM_PCR_COMPOSITE *tpc,
struct tpm_buffer *signature)
{
uint32_t ret;
STACK_TPM_BUFFER( tpmdata )
session sess;
unsigned char pubauth[TPM_HASH_SIZE];
unsigned char nonceodd[TPM_NONCE_SIZE];
unsigned char c;
uint32_t ordinal = htonl(TPM_ORD_Quote);
uint32_t keyhndl = htonl(keyhandle);
uint16_t pcrselsize;
uint32_t valuesize;
uint32_t sigsize;
uint32_t offset;
STACK_TPM_BUFFER( serPcrSel );
/* check input arguments */
if (tpc == NULL || externalData == NULL || signature == NULL) return ERR_NULL_ARG;
ret = needKeysRoom(keyhandle, 0, 0, 0);
if (ret != 0) {
return ret;
}
ret = TPM_WritePCRSelection(&serPcrSel, tps);
if ((ret & ERR_MASK))
return ret;
if (keyauth != NULL) /* authdata required */ {
/* Open OSAP Session */
ret = TSS_SessionOpen(SESSION_OSAP|SESSION_DSAP,&sess,
keyauth,TPM_ET_KEYHANDLE,keyhandle);
if (ret != 0) return ret;
/* generate odd nonce */
TSS_gennonce(nonceodd);
/* move Network byte order data to variables for hmac calculation */
c = 0;
/* calculate authorization HMAC value */
ret = TSS_authhmac(pubauth,TSS_Session_GetAuth(&sess),TPM_HASH_SIZE,TSS_Session_GetENonce(&sess),nonceodd,c,
TPM_U32_SIZE,&ordinal,
TPM_HASH_SIZE,externalData,
serPcrSel.used,serPcrSel.buffer,
0,0);
if (ret != 0) {
TSS_SessionClose(&sess);
return ret;
}
/* build the request buffer */
ret = TSS_buildbuff("00 C2 T l l % % L % o %",&tpmdata,
ordinal,
keyhndl,
TPM_HASH_SIZE,externalData,
serPcrSel.used, serPcrSel.buffer,
TSS_Session_GetHandle(&sess),
TPM_NONCE_SIZE,nonceodd,
c,
TPM_HASH_SIZE,pubauth);
if ((ret & ERR_MASK) != 0) {
TSS_SessionClose(&sess);
return ret;
}
/* transmit the request buffer to the TPM device and read the reply */
ret = TPM_Transmit(&tpmdata,"Quote");
TSS_SessionClose(&sess);
if (ret != 0) {
return ret;
}
offset = TPM_DATA_OFFSET;
/* calculate the size of the returned Blob */
ret = tpm_buffer_load16(&tpmdata,offset,&pcrselsize);
if ((ret & ERR_MASK)) {
return ret;
}
offset += TPM_U16_SIZE + pcrselsize;
ret = tpm_buffer_load32(&tpmdata,offset,&valuesize);
if ((ret & ERR_MASK)) {
return ret;
}
offset += TPM_U32_SIZE + valuesize;
ret = tpm_buffer_load32(&tpmdata,offset, &sigsize);
if ((ret & ERR_MASK)) {
return ret;
}
offset += TPM_U32_SIZE;
/* check the HMAC in the response */
ret = TSS_checkhmac1(&tpmdata,ordinal,nonceodd,TSS_Session_GetAuth(&sess),TPM_HASH_SIZE,
offset-TPM_DATA_OFFSET+sigsize,TPM_DATA_OFFSET,
0,0);
if (ret != 0) {
return ret;
}
ret = TPM_ReadPCRComposite(&tpmdata,
TPM_DATA_OFFSET,
tpc);
if ((ret & ERR_MASK)) {
return ret;
}
/* copy the returned blob to caller */
SET_TPM_BUFFER(signature,
&tpmdata.buffer[offset],
sigsize);
} else /* no authdata required */ {
/* build the request buffer */
ret = TSS_buildbuff("00 C1 T l l % %",&tpmdata,
ordinal,
keyhndl,
TPM_HASH_SIZE,externalData,
serPcrSel.used,serPcrSel.buffer);
if ((ret & ERR_MASK) != 0) return ret;
/* transmit the request buffer to the TPM device and read the reply */
ret = TPM_Transmit(&tpmdata,"Quote");
if (ret != 0) return ret;
/* calculate the size of the returned Blob */
offset = TPM_DATA_OFFSET;
ret = tpm_buffer_load16(&tpmdata,offset, &pcrselsize);
if ((ret & ERR_MASK)) {
return ret;
}
offset += TPM_U16_SIZE + pcrselsize;
ret = tpm_buffer_load32(&tpmdata,offset, &valuesize);
if ((ret & ERR_MASK)) {
return ret;
}
offset += TPM_U32_SIZE + valuesize;
ret = tpm_buffer_load32(&tpmdata,offset, &sigsize);
if ((ret & ERR_MASK)) {
return ret;
}
offset += TPM_U32_SIZE;
/* copy the returned PCR composite to caller */
ret = TPM_ReadPCRComposite(&tpmdata,
TPM_DATA_OFFSET,
tpc);
if ((ret & ERR_MASK)) {
return ret;
}
/* copy the returned blob to caller */
SET_TPM_BUFFER(signature,
&tpmdata.buffer[offset],
sigsize);
}
return 0;
}
uint32_t TPM_UnBind(uint32_t keyhandle,
unsigned char *keyauth,
unsigned char *data, uint32_t datalen,
unsigned char *blob, uint32_t * bloblen)
{
uint32_t ret = 0;
STACK_TPM_BUFFER(tpmdata)
session sess;
unsigned char pubauth[TPM_HASH_SIZE];
unsigned char nonceodd[TPM_NONCE_SIZE];
unsigned char c = 0;
uint32_t ordinal = htonl(TPM_ORD_UnBind);
uint32_t datsize = htonl(datalen);
uint32_t keyhndl = htonl(keyhandle);
uint16_t keytype;
uint32_t infosize;
/* check input arguments */
if (data == NULL || blob == NULL)
return ERR_NULL_ARG;
if (keyhandle == 0x40000000)
keytype = TPM_ET_SRK;
else
keytype = TPM_ET_KEYHANDLE;
ret = needKeysRoom(keyhandle, 0, 0, 0);
if (ret)
return ret;
if (keyauth != NULL) { /* key needs authorization */
/* Open OSAP Session */
ret = TSS_SessionOpen(SESSION_OSAP | SESSION_DSAP, &sess, keyauth,
keytype, keyhandle);
if (ret)
return ret;
/* generate odd nonce */
TSS_gennonce(nonceodd);
/* move Network byte order data to variables for HMAC calculation */
/* calculate authorization HMAC value */
ret = TSS_authhmac(pubauth, TSS_Session_GetAuth(&sess),
TPM_HASH_SIZE, TSS_Session_GetENonce(&sess),
nonceodd, c, TPM_U32_SIZE, &ordinal, TPM_U32_SIZE,
&datsize, datalen, data, 0, 0);
if (ret) {
TSS_SessionClose(&sess);
return ret;
}
/* build the request buffer */
ret = TSS_buildbuff("00 C2 T l l @ L % o %", &tpmdata,
ordinal,
keyhndl,
datalen, data,
TSS_Session_GetHandle(&sess),
TPM_NONCE_SIZE, nonceodd,
c, TPM_HASH_SIZE, pubauth);
if (ret & ERR_MASK) {
TSS_SessionClose(&sess);
return ret;
}
/* transmit the request buffer to the TPM device and read the reply */
ret = TPM_Transmit(&tpmdata, "UnBind");
TSS_SessionClose(&sess);
if (ret)
return ret;
/* calculate the size of the returned Blob */
ret = tpm_buffer_load32(&tpmdata, TPM_DATA_OFFSET, &infosize);
if (ret & ERR_MASK)
return ret;
/* check the HMAC in the response */
ret = TSS_checkhmac1(&tpmdata, ordinal, nonceodd,
TSS_Session_GetAuth(&sess), TPM_HASH_SIZE,
TPM_U32_SIZE, TPM_DATA_OFFSET, infosize,
TPM_DATA_OFFSET + TPM_U32_SIZE, 0, 0);
if (ret)
return ret;
/* copy the returned blob to caller */
memcpy(blob,
&tpmdata.buffer[TPM_DATA_OFFSET + TPM_U32_SIZE], infosize);
*bloblen = infosize;
} else { /* key needs NO authorization */
/* move Network byte order data to variables for HMAC calculation */
/* build the request buffer */
ret = TSS_buildbuff("00 C1 T l l @", &tpmdata,
ordinal, keyhndl, datalen, data);
if (ret & ERR_MASK)
return ret;
/* transmit the request buffer to the TPM device and read the reply */
ret = TPM_Transmit(&tpmdata, "UnBind");
if (ret)
return ret;
/* calculate the size of the returned Blob */
ret = tpm_buffer_load32(&tpmdata, TPM_DATA_OFFSET, &infosize);
if (ret & ERR_MASK)
return ret;
/* copy the returned blob to caller */
memcpy(blob, &tpmdata.buffer[TPM_DATA_OFFSET + TPM_U32_SIZE], infosize);
*bloblen = infosize;
}
return ret;
}