Java Algorithm类代码示例

import org.xbill.DNS.DNSSEC.Algorithm; //导入依赖的package包/类
public void testSIG0() throws Exception {
	Name sig0zoneName = new Name("sig0.invalid.");
	Name sig0hostName = new Name("sometext.sig0.invalid.");

	KeyPairGenerator rsagen = KeyPairGenerator.getInstance("RSA");
	KeyPair rsapair = rsagen.generateKeyPair();
	PrivateKey privKey = rsapair.getPrivate();
	PublicKey pubKey = rsapair.getPublic();

	KEYRecord keyRecord = new KEYRecord(sig0zoneName, DClass.IN,
					    0, KEYRecord.Flags.HOST,
					    KEYRecord.Protocol.DNSSEC,
					    DNSSEC.Algorithm.RSASHA1,
					    pubKey);
	TXTRecord txtRecord = new TXTRecord(sig0hostName, DClass.IN, 0, "Hello World!");
	Update updateMessage = new Update(sig0zoneName);
	updateMessage.add(txtRecord);

	SIG0.signMessage(updateMessage, keyRecord, privKey, null);
	Message message = new Message(updateMessage.toWire());
	SIG0.verifyMessage(message, message.toWire(), keyRecord, null);

}
 

import org.xbill.DNS.DNSSEC.Algorithm; //导入依赖的package包/类
/**
 * Determines if the algorithm is supported.
 * 
 * @param alg The algorithm to check.
 * @return True when the algorithm is supported, false otherwise.
 */
static boolean isAlgorithmSupported(int alg) {
    switch (alg) {
        case Algorithm.RSAMD5:
            return false; // obsoleted by rfc6944
        case Algorithm.DSA:
        case Algorithm.DSA_NSEC3_SHA1:
        case Algorithm.RSASHA1:
        case Algorithm.RSA_NSEC3_SHA1:
        case Algorithm.RSASHA256:
        case Algorithm.RSASHA512:
        case Algorithm.ECDSAP256SHA256:
        case Algorithm.ECDSAP384SHA384:
            return true;
        default:
            return false;
    }
}
 

import org.xbill.DNS.DNSSEC.Algorithm; //导入依赖的package包/类
@Test
public void testModifiedSignature() throws IOException {
    Name query = Name.fromString("www.ingotronic.ch.");

    // prepare a faked, unsigned response message that must have a signature
    // to be valid
    Message message = new Message();
    message.addRecord(Record.newRecord(query, Type.A, DClass.IN), Section.QUESTION);
    message.addRecord(new ARecord(query, Type.A, DClass.IN, InetAddress.getByName(localhost)), Section.ANSWER);
    message.addRecord(new RRSIGRecord(query, DClass.IN, 0, Type.A, Algorithm.RSASHA256, 5, new Date(System.currentTimeMillis() + 5000), new Date(System.currentTimeMillis() - 5000), 1234, Name.fromString("ingotronic.ch."), new byte[] { 1, 2, 3 }), Section.ANSWER);
    add("www.ingotronic.ch./A", message);

    Message response = resolver.send(createMessage("www.ingotronic.ch./A"));
    assertFalse("AD flag must not be set", response.getHeader().getFlag(Flags.AD));
    assertEquals(Rcode.SERVFAIL, response.getRcode());
    assertTrue(getReason(response).startsWith("failed.answer.positive:{ www.ingotronic.ch."));
}
 

import org.xbill.DNS.DNSSEC.Algorithm; //导入依赖的package包/类
@AlwaysOffline
@Test
public void testFavoriteDigestNotInRRset() throws Exception {
    Properties config = new Properties();
    config.put("org.jitsi.dnssec.digest_preference", "4");
    ValUtils v = new ValUtils();
    v.init(config);
    SRRset set = new SRRset();
    set.addRR(new DSRecord(Name.root, DClass.IN, 120, 1234, Algorithm.DSA, Digest.SHA1, new byte[] { 1, 2, 3 }));
    set.addRR(new DSRecord(Name.root, DClass.IN, 120, 1234, Algorithm.DSA, Digest.SHA256, new byte[] { 1, 2, 3 }));
    int digestId = Whitebox.invokeMethod(v, "favoriteDSDigestID", set);
    assertEquals(0, digestId);
}
 

import org.xbill.DNS.DNSSEC.Algorithm; //导入依赖的package包/类
@AlwaysOffline
@Test
public void testOnlyUnsupportedDigestInRRset() throws Exception {
    ValUtils v = new ValUtils();
    SRRset set = new SRRset();
    set.addRR(new DSRecord(Name.root, DClass.IN, 120, 1234, Algorithm.DSA, 3 /*GOST*/, new byte[] { 1, 2, 3 }));
    int digestId = Whitebox.invokeMethod(v, "favoriteDSDigestID", set);
    assertEquals(0, digestId);
}
 

import org.xbill.DNS.DNSSEC.Algorithm; //导入依赖的package包/类
private boolean validIterations(SRRset nsec, KeyCache keyCache) {
    SRRset dnskeyRrset = keyCache.find(nsec.getSignerName(), nsec.getDClass()).getRRset();
    // for now, we return the maximum iterations based simply on the key
    // algorithms that may have been used to sign the NSEC3 RRsets.
    try {
        for (Iterator<?> i = dnskeyRrset.rrs(); i.hasNext();) {
            DNSKEYRecord dnskey = (DNSKEYRecord)i.next();
            int keysize;
            switch (dnskey.getAlgorithm()) {
                case Algorithm.RSAMD5:
                    return false; // obsoleted by rfc6944
                case Algorithm.RSASHA1:
                case Algorithm.RSASHA256:
                case Algorithm.RSASHA512:
                case Algorithm.RSA_NSEC3_SHA1:
                    keysize = ((RSAPublicKey)dnskey.getPublicKey()).getModulus().bitLength();
                    break;
                case Algorithm.DSA:
                case Algorithm.DSA_NSEC3_SHA1:
                    keysize = ((DSAPublicKey)dnskey.getPublicKey()).getParams().getP().bitLength();
                    break;
                case Algorithm.ECDSAP256SHA256:
                case Algorithm.ECDSAP384SHA384:
                    keysize = ((ECPublicKey)dnskey.getPublicKey()).getParams().getCurve().getField().getFieldSize();
                    break;
                default:
                    return false;
            }

            Integer keyIters = this.maxIterations.floorKey(keysize);
            if (keyIters == null) {
                keyIters = this.maxIterations.firstKey();
            }

            keyIters = this.maxIterations.get(keyIters);
            if (((NSEC3Record)nsec.first()).getIterations() > keyIters) {
                return false;
            }
        }

        return true;
    }
    catch (DNSSECException e) {
        logger.error("Could not get public key from NSEC3 record", e);
        return false;
    }
}
 

import org.xbill.DNS.DNSSEC.Algorithm; //导入依赖的package包/类
public RplParser(InputStream data) {
    this.data = data;
    for (Field f : Algorithm.class.getFields()) {
        this.algoStrings.add(f.getName());
    }
}
 

import org.xbill.DNS.DNSSEC.Algorithm; //导入依赖的package包/类
private Record parseRecord(String line) throws IOException {
    try {
        Master ma = new Master(new ByteArrayInputStream(line.getBytes()), null, 3600);
        Record r = ma.nextRecord();
        if (r.getType() == Type.RRSIG) {
            RRSIGRecord rr = (RRSIGRecord)r;
            // unbound directly uses the DER format for DSA signatures
            // instead of the format specified in rfc2536#section-3
            if (rr.getAlgorithm() == Algorithm.DSA && rr.getSignature().length > 41) {
                Method DSASignaturetoDNS = DNSSEC.class.getDeclaredMethod("DSASignaturetoDNS", byte[].class, int.class);
                DSASignaturetoDNS.setAccessible(true);
                byte[] signature = (byte[])DSASignaturetoDNS.invoke(null, rr.getSignature(), 0);
                RRSIGRecord fixed = new RRSIGRecord(rr.getName(), rr.getDClass(), rr.getTTL(), rr.getTypeCovered(), rr.getAlgorithm(), rr.getOrigTTL(),
                        rr.getExpire(), rr.getTimeSigned(), rr.getFootprint(), rr.getSigner(), signature);
                Field f = getField(RRSIGRecord.class, "labels");
                f.setAccessible(true);
                f.set(fixed, rr.getLabels());
                r = fixed;
            }
        }

        return r;
    }
    catch (Exception ex) {
        if (ex.getMessage() != null && ex.getMessage().contains("expected an integer")) {
            String[] data = line.split("\\s");
            StringBuilder sb = new StringBuilder();
            for (int i = 0; i < data.length; i++) {
                if (this.algoStrings.contains(data[i])) {
                    sb.append(Algorithm.value(data[i]));
                }
                else {
                    sb.append(data[i]);
                }
                sb.append(' ');
            }

            return parseRecord(sb.toString());
        }
        else {
            throw new IOException(line, ex);
        }
    }
}