public boolean dec(String pubfile, String prvfile, String encfile, String decfile)
throws Exception {
byte[] plt, prv_byte, pub_byte;
CpabeEncryptedFile ciphertext;
BswabeCph cph;
BswabePrv prv;
BswabePub pub;
/* get BswabePub from pubfile */
pub_byte = Common.suckFile(pubfile);
pub = new BswabePub();
pub.initFromBuffer(pub_byte);
/* read ciphertext */
ciphertext = new CpabeEncryptedFile(pub, encfile);
cph = ciphertext.getCph();
/* get BswabePrv form prvfile */
prv_byte = Common.suckFile(prvfile);
prv = new BswabePrv(pub);
prv.initFromBuffer(prv_byte);
BswabeElementBoolean beb = Bswabe.dec(pub, prv, cph);
if (beb.isSuccessful() == false) {
return false;
}
plt = AESCoder.decrypt(beb.getElement().toBytes(), ciphertext.getAesBuf());
Common.spitFile(decfile, plt);
return true;
}
public void keygen(String pubfile, String prvfile, String mskfile, String attr_str)
throws NoSuchAlgorithmException, IOException {
BswabePub pub;
BswabeMsk msk;
byte[] pub_byte, msk_byte, prv_byte;
/* get BswabePub from pubfile */
pub_byte = Common.suckFile(pubfile);
pub = new BswabePub();
pub.initFromBuffer(pub_byte);
/* get BswabeMsk from mskfile */
msk_byte = Common.suckFile(mskfile);
msk = new BswabeMsk(pub);
msk.initFromBuffer(msk_byte);
String[] attr_arr = LangPolicy.parseAttribute(attr_str);
BswabePrv prv = Bswabe.keygen(pub, msk, attr_arr);
/* store BswabePrv into prvfile */
prv_byte = prv.serialize();
Common.spitFile(prvfile, prv_byte);
}