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 boolean enc(String pubfile, String policy, String inputfile, String encfile)
throws Exception {
CpabeEncryptedFile encFile;
BswabePub pub;
BswabeCph cph;
BswabeCphKey keyCph;
byte[] plt, aesBuf, pub_byte;
Element m;
/* get BswabePub from pubfile */
pub_byte = Common.suckFile(pubfile);
pub = new BswabePub();
pub.initFromBuffer(pub_byte);
/* encrypt */
keyCph = Bswabe.enc(pub, policy);
cph = keyCph.cph;
m = keyCph.key;
if (cph == null) {
return false;
}
/* write file to encrypted */
plt = Common.suckFile(inputfile);
aesBuf = AESCoder.encrypt(m.toBytes(), plt);
encFile = new CpabeEncryptedFile(cph, aesBuf);
Common.spitFile(encfile, encFile.serialize());
return true;
}
/** * @param args * @author Junwei Wang([email protected]) * @author "Swen Weiland ([email protected])" */ public void setup(String pubfile, String mskfile) throws IOException, ClassNotFoundException { byte[] pub_byte, msk_byte; BswabePub pub = new BswabePub(); BswabeMsk msk = new BswabeMsk(pub); Bswabe.setup(pub, msk); /* store BswabePub into mskfile */ pub_byte = pub.serialize(); Common.spitFile(pubfile, pub_byte); /* store BswabeMsk into mskfile */ msk_byte = msk.serialize(); Common.spitFile(mskfile, msk_byte); }
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);
}