[Trustedjava-support] Re : Bind large data

[marbouh m. <med...@ya...>]

Hello,=0A=0AThank you Thomas for relpying. I managed to bind large data by =
chaining data. But still don't understand why it dosn't work with unbind co=
mmand.=0A=0AThis is a what I'm doing for each block:=0A=0Abyte[ ] toUnBind_=
 =3D new byte[...];=0ATcBlobData decDatablob_ =3D TcTssStructFactory.newBlo=
bData().initByteArray(toUnBind_);=0AencData.setAttribData(TcTssDefines.TSS_=
TSPATTRIB_ENCDATA_BLOB,TcTssDefines. TSS_TSPATTRIB_ENCDATABLOB_BLOB, decDat=
ablob_);=0ATcBlobData bdata =3D decData.unbind(adminkey[1]);=0A=0AThen I go=
t the  message :=0A=0ATSPI call error:=0A  error code:    0x3=0A  error mes=
sage: TPM layer: Bad Parameter=0A    at iaik.tss.impl.jni.TcBaseObject.hand=
leRetCode(TcBaseObject.java:98)=0A    at iaik.tss.impl.jni.TcEncData.unbind=
(TcEncData.java:97)=0A    at com.francetelecom.drm.tpm.TPMManager.bindData(=
TPMManager.java:550)=0A=0Awhen calling "unbind" method.=0ADo you think I mu=
st do something to the blob data decDatablob before giving it to unbind met=
hod.=0A=0AThank you in advance.=0A=0AMom=0A=0A=0A----- Message d'origine --=
--=0ADe : Thomas Winkler <tho...@ia...>=0A=C0 : marbouh me=
d <med...@ya...>=0ACc : tru...@li...=
=0AEnvoy=E9 le : Lundi, 9 Octobre 2006, 7h24mn 12s=0AObjet : Re: [Trustedja=
va-support] Bind large data=0A=0AHello,=0A=0A > I have a problem when tryin=
g to bind data that is larger than my RSA=0A > public key modulus. TSS Spec=
 precise that I=0A must block then chain the=0A > data. Can you tell me wha=
t does this mean and is there any function that=0A > do this.=0A=0AYou are,=
 more or less, answering your question yourself.=0AUsing the TSS you can no=
t bind data larger than the RSA public key (that =0Aactually is not specifi=
c to the TSS but is a general property). What you =0A  have to do is to spl=
it you input data into block equal to the RSA =0Apublic key length. Then en=
crypt (bind) these blocks one after the other. =0AOn decryption (unbind) si=
mply reverse the process.=0A=0ARegards,=0AThomas Winkler=0A=0A=0A=0A=0A=0A=
=0A=0A=0A=09=0A=0A=09=0A=09=09=0A__________________________________________=
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