public static void main(String[] args) throws Exception {
//
// check args and get plaintext
if (args.length != 1) {
System.err.println("Usage: java MessageAuthenticationCodeExample text");
System.exit(1);
}
byte[] plainText = args[0].getBytes("UTF8");
//
// get a key for the HmacMD5 algorithm
System.out.println("\nStart generating key");
KeyGenerator keyGen = KeyGenerator.getInstance("HmacMD5");
SecretKey MD5key = keyGen.generateKey();
System.out.println("Finish generating key");
//
// get a MAC object and update it with the plaintext
Mac mac = Mac.getInstance("HmacMD5");
mac.init(MD5key);
mac.update(plainText);
//
// print out the provider used and the MAC
System.out.println("\n" + mac.getProvider().getInfo());
System.out.println("\nMAC: ");
System.out.println(new String(mac.doFinal(), "UTF8"));
}
private static SecretKey generateSymmetricKey() throws Exception {
KeyGenerator generator = KeyGenerator.getInstance(KEY_ALGORITHM);
SecureRandom random = new SecureRandom();
generator.init(KEY_LENGTH_BITS, random);
logger.debug("Generate Key");
return generator.generateKey();
// return new SecretKeySpec(Hex.decodeHex("cb024600dce7148b8ddc5d6c111fbd85".toCharArray()),
// KEY_ALGORITHM);
}
@Override
public SymmetricKey createKey() {
KeyGenerator kgen;
try {
kgen = KeyGenerator.getInstance("AES");
kgen.init(256);
final SecretKey skey = kgen.generateKey();
return new AES256SymmetricKey(skey.getEncoded());
} catch (final NoSuchAlgorithmException e) {
throw new RuntimeException(e);
}
}
public static void main(String[] args) throws Exception {
BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
// get user inputted key
byte[] userkey = null;
do {
System.out.println("Please enter a 8 character string to generate a Secret Key");
userkey = (in.readLine()).getBytes();
} while (userkey.length != 8);
// create Key Generator instance and generate a secret key
KeyGenerator kgen = KeyGenerator.getInstance("DES");
SecretKey skey = kgen.generateKey();
byte[] key = userkey;
// Create a Secret Key based on characters entered by the user
SecretKeySpec skeyspec = new SecretKeySpec(key, "DES");
// Create a cipher to encrypt with
Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");
cipher.init(Cipher.ENCRYPT_MODE, skeyspec);
// Get message
System.out.println("Please enter a string to encrypt");
byte[] userstring = null;
userstring = (in.readLine()).getBytes();
// Encrypt message with cipher
byte[] encrypted = cipher.doFinal(userstring);
String enc_string = new String(encrypted);
System.out.println("The String is encrypted as " + enc_string);
byte[] userdecrypt = null;
byte[] decrypted = null;
// Get user decrypt key
do {
System.out.println("Please enter the 8 character key to decrypt the message");
userdecrypt = (in.readLine()).getBytes();
} while (userdecrypt.length != 8);
// Reinitialize Secret Key and Cipher
key = userdecrypt;
SecretKeySpec decryptkey = new SecretKeySpec(key, "DES");
cipher.init(Cipher.DECRYPT_MODE, decryptkey);
// Decrypt message
decrypted = cipher.doFinal(encrypted);
if ((new String(decrypted)).equals(new String(userstring)))
System.out.println("\nMessage decrypted as: " + (new String(decrypted)));
else System.out.println("\nMessage was not decrypted");
}
public void generate_new_aes_key() {
try {
KeyGenerator localKeyGenerator = KeyGenerator.getInstance("AES");
localKeyGenerator.init(128, SecureRandom.getInstance("SHA1PRNG"));
// aes_key = Base64.encodeBase64String(localKeyGenerator.generateKey().getEncoded());
aes_key =
new String(Base64.encode(localKeyGenerator.generateKey().getEncoded(), Base64.DEFAULT));
} catch (NoSuchAlgorithmException localNoSuchAlgorithmException) {
System.out.println(localNoSuchAlgorithmException);
}
return;
}
/** Creates a new instance of Encrypter */
public AltEncrypter(String passPhrase) {
try {
SecureRandom sr = SecureRandom.getInstance("SHA1PRNG");
sr.setSeed(passPhrase.getBytes("UTF8"));
KeyGenerator kGen = KeyGenerator.getInstance("DESEDE");
kGen.init(168, sr);
Key key = kGen.generateKey();
cipherEncrypt = Cipher.getInstance("DESEDE/ECB/PKCS5Padding");
cipherEncrypt.init(Cipher.ENCRYPT_MODE, key);
cipherDecrypt = Cipher.getInstance("DESEDE/ECB/PKCS5Padding");
cipherDecrypt.init(Cipher.DECRYPT_MODE, key);
} catch (UnsupportedEncodingException e) {
} catch (NoSuchPaddingException e) {
} catch (NoSuchAlgorithmException e) {
} catch (InvalidKeyException e) {
}
}
@SuppressWarnings("restriction")
public String getencrypt(String p) throws Exception {
String encrypted = "";
try {
KeyGenerator kgen = KeyGenerator.getInstance("AES");
kgen.init(128, new SecureRandom(KEY.getBytes()));
SecretKey skey = kgen.generateKey();
byte[] raw = skey.getEncoded();
SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
Cipher cipher = Cipher.getInstance("AES");
cipher.init(Cipher.ENCRYPT_MODE, skeySpec);
byte[] encrypt = cipher.doFinal(p.getBytes());
encrypted = new BASE64Encoder().encodeBuffer(encrypt).trim();
// System.out.println("encrypted="+encrypted);
} // try
catch (Exception e) {
System.out.println(e);
}
return encrypted; // return 密文
}
public String getdecrypt(String base64) throws Exception {
String decrypted = "";
try {
@SuppressWarnings("restriction")
byte[] b = new BASE64Decoder().decodeBuffer(base64);
KeyGenerator kgen2 = KeyGenerator.getInstance("AES");
kgen2.init(128, new SecureRandom(KEY.getBytes()));
SecretKey skey2 = kgen2.generateKey();
byte[] raw2 = skey2.getEncoded();
SecretKeySpec skeySpec2 = new SecretKeySpec(raw2, "AES");
Cipher cipher2 = Cipher.getInstance("AES");
cipher2.init(Cipher.DECRYPT_MODE, skeySpec2);
byte[] decrypt = cipher2.doFinal(b);
decrypted = new String(decrypt);
// System.out.println("decrypted="+decrypted);
} catch (Exception e) {
System.out.println(e);
}
return decrypted;
}
public static void main(String[] args) {
try {
if (args[0].equals("-genkey")) {
KeyPairGenerator pairgen = KeyPairGenerator.getInstance("RSA");
SecureRandom random = new SecureRandom();
pairgen.initialize(KEYSIZE, random);
KeyPair keyPair = pairgen.generateKeyPair();
ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream(args[1]));
out.writeObject(keyPair.getPublic());
out.close();
out = new ObjectOutputStream(new FileOutputStream(args[2]));
out.writeObject(keyPair.getPrivate());
out.close();
} else if (args[0].equals("-encrypt")) {
KeyGenerator keygen = KeyGenerator.getInstance("AES");
SecureRandom random = new SecureRandom();
keygen.init(random);
SecretKey key = keygen.generateKey();
// wrap with RSA public key
ObjectInputStream keyIn = new ObjectInputStream(new FileInputStream(args[3]));
Key publicKey = (Key) keyIn.readObject();
keyIn.close();
Cipher cipher = Cipher.getInstance("RSA");
cipher.init(Cipher.WRAP_MODE, publicKey);
byte[] wrappedKey = cipher.wrap(key);
DataOutputStream out = new DataOutputStream(new FileOutputStream(args[2]));
out.writeInt(wrappedKey.length);
out.write(wrappedKey);
InputStream in = new FileInputStream(args[1]);
cipher = Cipher.getInstance("AES");
cipher.init(Cipher.ENCRYPT_MODE, key);
crypt(in, out, cipher);
in.close();
out.close();
} else {
DataInputStream in = new DataInputStream(new FileInputStream(args[1]));
int length = in.readInt();
byte[] wrappedKey = new byte[length];
in.read(wrappedKey, 0, length);
// unwrap with RSA private key
ObjectInputStream keyIn = new ObjectInputStream(new FileInputStream(args[3]));
Key privateKey = (Key) keyIn.readObject();
keyIn.close();
Cipher cipher = Cipher.getInstance("RSA");
cipher.init(Cipher.UNWRAP_MODE, privateKey);
Key key = cipher.unwrap(wrappedKey, "AES", Cipher.SECRET_KEY);
OutputStream out = new FileOutputStream(args[2]);
cipher = Cipher.getInstance("AES");
cipher.init(Cipher.DECRYPT_MODE, key);
crypt(in, out, cipher);
in.close();
out.close();
}
} catch (IOException e) {
e.printStackTrace();
} catch (GeneralSecurityException e) {
e.printStackTrace();
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
}
/*
* Calculate the keys needed for this connection, once the session's
* master secret has been calculated. Uses the master key and nonces;
* the amount of keying material generated is a function of the cipher
* suite that's been negotiated.
*
* This gets called both on the "full handshake" (where we exchanged
* a premaster secret and started a new session) as well as on the
* "fast handshake" (where we just resumed a pre-existing session).
*/
void calculateConnectionKeys(SecretKey masterKey) {
/*
* For both the read and write sides of the protocol, we use the
* master to generate MAC secrets and cipher keying material. Block
* ciphers need initialization vectors, which we also generate.
*
* First we figure out how much keying material is needed.
*/
int hashSize = cipherSuite.macAlg.size;
boolean is_exportable = cipherSuite.exportable;
BulkCipher cipher = cipherSuite.cipher;
int expandedKeySize = is_exportable ? cipher.expandedKeySize : 0;
// Which algs/params do we need to use?
String keyMaterialAlg;
PRF prf;
if (protocolVersion.v >= ProtocolVersion.TLS12.v) {
keyMaterialAlg = "SunTls12KeyMaterial";
prf = cipherSuite.prfAlg;
} else {
keyMaterialAlg = "SunTlsKeyMaterial";
prf = P_NONE;
}
String prfHashAlg = prf.getPRFHashAlg();
int prfHashLength = prf.getPRFHashLength();
int prfBlockSize = prf.getPRFBlockSize();
TlsKeyMaterialParameterSpec spec =
new TlsKeyMaterialParameterSpec(
masterKey,
protocolVersion.major,
protocolVersion.minor,
clnt_random.random_bytes,
svr_random.random_bytes,
cipher.algorithm,
cipher.keySize,
expandedKeySize,
cipher.ivSize,
hashSize,
prfHashAlg,
prfHashLength,
prfBlockSize);
try {
KeyGenerator kg = JsseJce.getKeyGenerator(keyMaterialAlg);
kg.init(spec);
TlsKeyMaterialSpec keySpec = (TlsKeyMaterialSpec) kg.generateKey();
clntWriteKey = keySpec.getClientCipherKey();
svrWriteKey = keySpec.getServerCipherKey();
// Return null if IVs are not supposed to be generated.
// e.g. TLS 1.1+.
clntWriteIV = keySpec.getClientIv();
svrWriteIV = keySpec.getServerIv();
clntMacSecret = keySpec.getClientMacKey();
svrMacSecret = keySpec.getServerMacKey();
} catch (GeneralSecurityException e) {
throw new ProviderException(e);
}
//
// Dump the connection keys as they're generated.
//
if (debug != null && Debug.isOn("keygen")) {
synchronized (System.out) {
HexDumpEncoder dump = new HexDumpEncoder();
System.out.println("CONNECTION KEYGEN:");
// Inputs:
System.out.println("Client Nonce:");
printHex(dump, clnt_random.random_bytes);
System.out.println("Server Nonce:");
printHex(dump, svr_random.random_bytes);
System.out.println("Master Secret:");
printHex(dump, masterKey.getEncoded());
// Outputs:
System.out.println("Client MAC write Secret:");
printHex(dump, clntMacSecret.getEncoded());
System.out.println("Server MAC write Secret:");
printHex(dump, svrMacSecret.getEncoded());
if (clntWriteKey != null) {
System.out.println("Client write key:");
printHex(dump, clntWriteKey.getEncoded());
System.out.println("Server write key:");
printHex(dump, svrWriteKey.getEncoded());
} else {
System.out.println("... no encryption keys used");
}
if (clntWriteIV != null) {
System.out.println("Client write IV:");
printHex(dump, clntWriteIV.getIV());
System.out.println("Server write IV:");
printHex(dump, svrWriteIV.getIV());
} else {
if (protocolVersion.v >= ProtocolVersion.TLS11.v) {
System.out.println("... no IV derived for this protocol");
} else {
System.out.println("... no IV used for this cipher");
}
}
System.out.flush();
}
}
}
/*
* Calculate the master secret from its various components. This is
* used for key exchange by all cipher suites.
*
* The master secret is the catenation of three MD5 hashes, each
* consisting of the pre-master secret and a SHA1 hash. Those three
* SHA1 hashes are of (different) constant strings, the pre-master
* secret, and the nonces provided by the client and the server.
*/
private SecretKey calculateMasterSecret(
SecretKey preMasterSecret, ProtocolVersion requestedVersion) {
if (debug != null && Debug.isOn("keygen")) {
HexDumpEncoder dump = new HexDumpEncoder();
System.out.println("SESSION KEYGEN:");
System.out.println("PreMaster Secret:");
printHex(dump, preMasterSecret.getEncoded());
// Nonces are dumped with connection keygen, no
// benefit to doing it twice
}
// What algs/params do we need to use?
String masterAlg;
PRF prf;
if (protocolVersion.v >= ProtocolVersion.TLS12.v) {
masterAlg = "SunTls12MasterSecret";
prf = cipherSuite.prfAlg;
} else {
masterAlg = "SunTlsMasterSecret";
prf = P_NONE;
}
String prfHashAlg = prf.getPRFHashAlg();
int prfHashLength = prf.getPRFHashLength();
int prfBlockSize = prf.getPRFBlockSize();
TlsMasterSecretParameterSpec spec =
new TlsMasterSecretParameterSpec(
preMasterSecret,
protocolVersion.major,
protocolVersion.minor,
clnt_random.random_bytes,
svr_random.random_bytes,
prfHashAlg,
prfHashLength,
prfBlockSize);
SecretKey masterSecret;
try {
KeyGenerator kg = JsseJce.getKeyGenerator(masterAlg);
kg.init(spec);
masterSecret = kg.generateKey();
} catch (GeneralSecurityException e) {
// For RSA premaster secrets, do not signal a protocol error
// due to the Bleichenbacher attack. See comments further down.
if (!preMasterSecret.getAlgorithm().equals("TlsRsaPremasterSecret")) {
throw new ProviderException(e);
}
if (debug != null && Debug.isOn("handshake")) {
System.out.println("RSA master secret generation error:");
e.printStackTrace(System.out);
System.out.println("Generating new random premaster secret");
}
if (requestedVersion != null) {
preMasterSecret = RSAClientKeyExchange.generateDummySecret(requestedVersion);
} else {
preMasterSecret = RSAClientKeyExchange.generateDummySecret(protocolVersion);
}
// recursive call with new premaster secret
return calculateMasterSecret(preMasterSecret, null);
}
// if no version check requested (client side handshake), or version
// information is not available (not an RSA premaster secret),
// return master secret immediately.
if ((requestedVersion == null) || !(masterSecret instanceof TlsMasterSecret)) {
return masterSecret;
}
// we have checked the ClientKeyExchange message when reading TLS
// record, the following check is necessary to ensure that
// JCE provider does not ignore the checking, or the previous
// checking process bypassed the premaster secret version checking.
TlsMasterSecret tlsKey = (TlsMasterSecret) masterSecret;
int major = tlsKey.getMajorVersion();
int minor = tlsKey.getMinorVersion();
if ((major < 0) || (minor < 0)) {
return masterSecret;
}
// check if the premaster secret version is ok
// the specification says that it must be the maximum version supported
// by the client from its ClientHello message. However, many
// implementations send the negotiated version, so accept both
// for SSL v3.0 and TLS v1.0.
// NOTE that we may be comparing two unsupported version numbers, which
// is why we cannot use object reference equality in this special case.
ProtocolVersion premasterVersion = ProtocolVersion.valueOf(major, minor);
boolean versionMismatch = (premasterVersion.v != requestedVersion.v);
/*
* we never checked the client_version in server side
* for TLS v1.0 and SSL v3.0. For compatibility, we
* maintain this behavior.
*/
if (versionMismatch && requestedVersion.v <= ProtocolVersion.TLS10.v) {
versionMismatch = (premasterVersion.v != protocolVersion.v);
}
if (versionMismatch == false) {
// check passed, return key
return masterSecret;
}
// Due to the Bleichenbacher attack, do not signal a protocol error.
// Generate a random premaster secret and continue with the handshake,
// which will fail when verifying the finished messages.
// For more information, see comments in PreMasterSecret.
if (debug != null && Debug.isOn("handshake")) {
System.out.println(
"RSA PreMasterSecret version error: expected"
+ protocolVersion
+ " or "
+ requestedVersion
+ ", decrypted: "
+ premasterVersion);
System.out.println("Generating new random premaster secret");
}
preMasterSecret = RSAClientKeyExchange.generateDummySecret(requestedVersion);
// recursive call with new premaster secret
return calculateMasterSecret(preMasterSecret, null);
}