/**
* Generate a new random password
*
* @return a new random password
*/
private String generateRandomPassword(
String[] rnd0, String[] rnd1, String[] rnd2, String[] rnd3, String[] rnd4) {
StringBuilder ret = new StringBuilder();
// Get lists of random words. We could cache these, but this method is
// rarely called and caching would
// depend on user locale, so we prefer to waste CPU better than memory.
// Get a true random number generator
SecureRandom rnd;
try {
rnd = SecureRandom.getInstance("SHA1PRNG");
} catch (NoSuchAlgorithmException ex) {
rnd = new SecureRandom();
}
// Generate random numbers
int i0 = rnd.nextInt(rnd0.length);
int i1 = rnd.nextInt(rnd1.length);
int i2 = rnd.nextInt(rnd2.length);
int i3 = rnd.nextInt(rnd3.length);
int i4 = rnd.nextInt(rnd4.length);
// Compose password
ret.append(rnd0[i0]);
ret.append(rnd1[i1]);
ret.append(rnd2[i2]);
ret.append(rnd3[i3]);
ret.append(rnd4[i4]);
return ret.toString();
}
/**
* 문자열 A에서 Z사이의 랜덤 문자열을 구하는 기능을 제공 시작문자열과 종료문자열 사이의 랜덤 문자열을 구하는 기능
*
* @param startChr - 첫 문자
* @param endChr - 마지막문자
* @return 랜덤문자
* @exception MyException
* @see
*/
public static String getRandomStr(char startChr, char endChr) {
int randomInt;
String randomStr = null;
// 시작문자 및 종료문자를 아스키숫자로 변환한다.
int startInt = Integer.valueOf(startChr);
int endInt = Integer.valueOf(endChr);
// 시작문자열이 종료문자열보가 클경우
if (startInt > endInt) {
throw new IllegalArgumentException("Start String: " + startChr + " End String: " + endChr);
}
try {
// 랜덤 객체 생성
SecureRandom rnd = new SecureRandom();
do {
// 시작문자 및 종료문자 중에서 랜덤 숫자를 발생시킨다.
randomInt = rnd.nextInt(endInt + 1);
} while (randomInt < startInt); // 입력받은 문자 'A'(65)보다 작으면 다시 랜덤 숫자 발생.
// 랜덤 숫자를 문자로 변환 후 스트링으로 다시 변환
randomStr = (char) randomInt + "";
} catch (Exception e) {
e.printStackTrace();
}
// 랜덤문자열를 리턴
return randomStr;
}
private SecureRandom getSecureRandom(String RNGAlgorithm, String RNGProvider) {
try {
SecureRandom r;
if (RNGProvider != null) {
r = SecureRandom.getInstance(RNGAlgorithm, RNGProvider);
} else {
r = SecureRandom.getInstance(RNGAlgorithm);
}
r.nextBytes(new byte[1]);
return r;
} catch (NoSuchProviderException e) {
// Fallback to any provider for the algorithm
return getSecureRandom(RNGAlgorithm, null);
} catch (NoSuchAlgorithmException e) {
if (RNGProvider != null) {
return getSecureRandom(RNGAlgorithm, null);
}
Spout.getLogger()
.severe(
"Unable to find algorithm to generate random number generator for key pair creation ("
+ RNGAlgorithm
+ ", "
+ RNGProvider
+ ")");
return null;
}
}
public void putOutMessages() {
synchronized (collectedMessages) {
int sendable;
int pool = collectedMessages.size();
if (pool >= (MIN_POOL + MIN_SEND)) {
sendable = pool - MIN_SEND;
sendable = Math.min(sendable, Math.max(1, (int) Math.round((double) pool * SEND_RATE)));
} else {
sendable = 0;
}
if (sendable > 0) {
if (isRequestPool) {
for (int i = 0; i < sendable; i++) {
int chosen = secureRandom.nextInt(collectedMessages.size());
anonNode.putOutRequest((Request) collectedMessages.remove(chosen));
}
} else {
for (int i = 0; i < sendable; i++) {
int chosen = secureRandom.nextInt(collectedMessages.size());
anonNode.putOutReply((Reply) collectedMessages.remove(chosen));
}
}
}
}
}
static {
// Generate 8 bytes of random data.
SecureRandom secureRandom = new SecureRandom();
byte bytes[] = new byte[8];
secureRandom.nextBytes(bytes);
randomBytes = bytes;
}
private void rawModeTest(
String sigName,
ASN1ObjectIdentifier digestOID,
PrivateKey privKey,
PublicKey pubKey,
SecureRandom random)
throws Exception {
byte[] sampleMessage = new byte[1000 + random.nextInt(100)];
random.nextBytes(sampleMessage);
Signature normalSig = Signature.getInstance(sigName, "BC");
normalSig.initSign(privKey);
normalSig.update(sampleMessage);
byte[] normalResult = normalSig.sign();
MessageDigest digest = MessageDigest.getInstance(digestOID.getId(), "BC");
byte[] hash = digest.digest(sampleMessage);
byte[] digInfo = derEncode(digestOID, hash);
Signature rawSig = Signature.getInstance("RSA", "BC");
rawSig.initSign(privKey);
rawSig.update(digInfo);
byte[] rawResult = rawSig.sign();
if (!Arrays.areEqual(normalResult, rawResult)) {
fail("raw mode signature differs from normal one");
}
rawSig.initVerify(pubKey);
rawSig.update(digInfo);
if (!rawSig.verify(rawResult)) {
fail("raw mode signature verification failed");
}
}
/**
* Generate a random int value uniformly distributed between <code>lower</code> and <code>upper
* </code>, inclusive. This algorithm uses a secure random number generator.
*
* @param lower the lower bound.
* @param upper the upper bound.
* @return the random integer.
*/
public int nextSecureInt(int lower, int upper) {
if (lower >= upper) {
throw new IllegalArgumentException("lower bound must be < upper bound");
}
SecureRandom sec = getSecRan();
return lower + (int) (sec.nextDouble() * (upper - lower + 1));
}
public void testSOEProof() {
final StringBuilder sb = new StringBuilder();
final SecureRandom random = new SecureRandom();
sb.append("class SOE_test {\n BigInteger BIG = new BigInteger(\n");
int i;
for (i = 0; i < 100000; i++) {
sb.append(" \"").append(Math.abs(random.nextInt())).append("\" +\n");
}
sb.append(" \"\");\n}");
final PsiJavaFile file = (PsiJavaFile) createLightFile("SOE_test.java", sb.toString());
long t = System.currentTimeMillis();
final StubElement tree = NEW_BUILDER.buildStubTree(file);
t = System.currentTimeMillis() - t;
assertEquals(
"PsiJavaFileStub []\n"
+ " IMPORT_LIST:PsiImportListStub\n"
+ " CLASS:PsiClassStub[name=SOE_test fqn=SOE_test]\n"
+ " MODIFIER_LIST:PsiModifierListStub[mask=4096]\n"
+ " TYPE_PARAMETER_LIST:PsiTypeParameterListStub\n"
+ " EXTENDS_LIST:PsiRefListStub[EXTENDS_LIST:]\n"
+ " IMPLEMENTS_LIST:PsiRefListStub[IMPLEMENTS_LIST:]\n"
+ " FIELD:PsiFieldStub[BIG:BigInteger=;INITIALIZER_NOT_STORED;]\n"
+ " MODIFIER_LIST:PsiModifierListStub[mask=4096]\n",
DebugUtil.stubTreeToString(tree));
System.out.println("SOE depth=" + i + ", time=" + t + "ms");
}
private static byte[] generateSalt() throws NoSuchAlgorithmException {
SecureRandom random = SecureRandom.getInstance("SHA1PRNG");
byte[] salt = new byte[16];
random.nextBytes(salt);
return salt;
}
/**
* 获得加密后的16进制形式口令
*
* @param password
* @return
* @throws NoSuchAlgorithmException
* @throws UnsupportedEncodingException
*/
public static String getEncryptedPwd(String password)
throws NoSuchAlgorithmException, UnsupportedEncodingException {
// 声明加密后的口令数组变量
byte[] pwd = null;
// 随机数生成器
SecureRandom random = new SecureRandom();
// 声明盐数组变量
byte[] salt = new byte[SALT_LENGTH];
// 将随机数放入盐变量中
random.nextBytes(salt);
// 声明消息摘要对象
MessageDigest md = null;
// 创建消息摘要
md = MessageDigest.getInstance("MD5");
// 将盐数据传入消息摘要对象
md.update(salt);
// 将口令的数据传给消息摘要对象
md.update(password.getBytes("UTF-8"));
// 获得消息摘要的字节数组
byte[] digest = md.digest();
// 因为要在口令的字节数组中存放盐，所以加上盐的字节长度
pwd = new byte[digest.length + SALT_LENGTH];
// 将盐的字节拷贝到生成的加密口令字节数组的前12个字节，以便在验证口令时取出盐
System.arraycopy(salt, 0, pwd, 0, SALT_LENGTH);
// 将消息摘要拷贝到加密口令字节数组从第13个字节开始的字节
System.arraycopy(digest, 0, pwd, SALT_LENGTH, digest.length);
// 将字节数组格式加密后的口令转化为16进制字符串格式的口令
return byteToHexString(pwd);
}
/** Generate a local password and save it in the local-password file. */
public void postConstruct() {
logger.fine("Generating local password");
SecureRandom random = new SecureRandom();
byte[] pwd = new byte[PASSWORD_BYTES];
random.nextBytes(pwd);
password = toHex(pwd);
File localPasswordFile = new File(env.getConfigDirPath(), LOCAL_PASSWORD_FILE);
PrintWriter w = null;
try {
if (!localPasswordFile.exists()) {
localPasswordFile.createNewFile();
/*
* XXX - There's a security hole here.
* Between the time the file is created and the permissions
* are changed to prevent others from opening it, someone
* else could open it and wait for the data to be written.
* Java needs the ability to create a file that's readable
* only by the owner; coming in JDK 7.
*/
localPasswordFile.setWritable(false, false); // take from all
localPasswordFile.setWritable(true, true); // owner only
localPasswordFile.setReadable(false, false); // take from all
localPasswordFile.setReadable(true, true); // owner only
}
w = new PrintWriter(localPasswordFile);
w.println(password);
} catch (IOException ex) {
// ignore errors
logger.log(Level.FINE, "Exception writing local password file", ex);
} finally {
if (w != null) w.close();
}
}
private HashMap<Point2D, String> makePointList(String category, List<Report> toolResults) {
HashMap<Point2D, String> map = new HashMap<Point2D, String>();
char ch = 'A';
// make a list of all points. Add in a tiny random to prevent exact duplicate coordinates in
// map
for (Report r : toolResults) {
OverallResult or = r.getOverallResults().getResults(category);
double x = or.getFalsePositiveRate() * 100 + sr.nextDouble() * .000001;
double y =
or.getTruePositiveRate() * 100
+ sr.nextDouble() * .000001
- 1; // this puts the label just below the point
Point2D p = new Point2D.Double(x, y);
String label = "" + ch;
map.put(p, label);
ch++;
}
Point2D ap =
new Point2D.Double(
afr * 100 + sr.nextDouble() * .000001, atr * 100 + sr.nextDouble() * .000001 - 1);
map.put(ap, "" + ch);
dedupify(map);
return map;
}
public Message startAuthentication(AuthenticationMessage msg)
throws AuthenticationException, GeneralSecurityException {
if (msg instanceof RequestLoginMessage) {
RequestLoginMessage rlm = (RequestLoginMessage) msg;
username = rlm.getLogin();
if (!allowRoot && username.equals("root")) {
throw new AuthenticationException("Must authenticate as a regular user first.");
}
// generate challange
byte[] passhash = UserManager.v().getPassHash(username);
if (passhash == null) {
throw new AuthenticationException("User has no password");
}
ChallangeMessage cm = new ChallangeMessage();
SecureRandom rand = new SecureRandom();
rand.nextBytes(randNumber);
cm.setChallange(randNumber, passhash);
state = CL_CHALLANGE_SENT;
// send the challange
return cm;
} else if (msg instanceof ChallangeCheckStatusMessage) {
// After authentication is complete the client sends this message
// It can be safely ignored. We don't care that the client has
// actually authenticated us.
return null;
}
throw new AuthenticationException("State Error");
}
public static String generateOTP(int otpLengthNumber) {
String otp = new String();
int otpSample = 0;
for (int i = 0; i < otpLengthNumber; i++) {
otp = otp + "9";
}
otpSample = Integer.parseInt(otp);
SecureRandom prng;
try {
prng = SecureRandom.getInstance("SHA1PRNG"); // Number Generation Algorithm
otp = new Integer(prng.nextInt(otpSample)).toString();
otp = (otp.length() < otpLengthNumber) ? padleft(otp, otpLengthNumber, '0') : otp;
} catch (NoSuchAlgorithmException e) {
}
// If generated OTP exists in DB -regenerate OTP again
boolean otpExists = false;
if (otpExists) {
generateOTP(otpLengthNumber);
} else {
return otp;
}
return otp;
}
/* goodG2B1() - use goodsource and badsink by changing first private_final_t to private_final_f */
private void goodG2B1() throws Throwable {
int data;
/* INCIDENTAL: CWE 570 Statement is Always False */
if (private_final_f) {
/* INCIDENTAL: CWE 561 Dead Code, the code below will never run */
Logger log_bad = Logger.getLogger("local-logger");
SecureRandom r = new SecureRandom();
data = r.nextInt();
} else {
java.util.logging.Logger log_good = java.util.logging.Logger.getLogger("local-logger");
/* FIX: Use a hardcoded number that won't cause underflow, overflow,
divide by zero, or loss-of-precision issues */
data = 2;
}
/* INCIDENTAL: CWE 571 Statement is Always True */
if (private_final_t) {
/* POTENTIAL FLAW: Zero denominator will cause an issue. An integer division will
result in an exception. */
IO.writeLine("bad: 100/" + String.valueOf(data) + " = " + (100 / data) + "\n");
} else {
/* INCIDENTAL: CWE 561 Dead Code, the code below will never run */
/* FIX: test for a zero denominator */
if (data != 0) {
IO.writeLine("100/" + String.valueOf(data) + " = " + (100 / data) + "\n");
} else {
IO.writeLine("This would result in a divide by zero");
}
}
}
public static void main(String[] args) {
SecureRandom random;
try {
random = SecureRandom.getInstance("SHA1PRNG");
byte[] keyBytes = new byte[16];
random.nextBytes(keyBytes);
byte[] ivBytes = new byte[16];
random.nextBytes(ivBytes);
KeyIVPair keyIvPair =
new KeyIVPair(
"8x/xUBgX0Up+3UEo39dSeG277JhVj31+ElHkN5+EC0Q=",
"Y2SUiIN6JXTdKNK/ZMDyVtLB7gAM9MCCiyrP1xd3bSQ=");
// keyIvPair.setKeyBytes(keyBytes);
// keyIvPair.setIvBytes(ivBytes);
Gson gson = new GsonBuilder().create();
ConsoleProxyPasswordBasedEncryptor encryptor =
new ConsoleProxyPasswordBasedEncryptor(gson.toJson(keyIvPair));
String encrypted = encryptor.encryptText("Hello, world");
System.out.println("Encrypted result: " + encrypted);
String decrypted = encryptor.decryptText(encrypted);
System.out.println("Decrypted result: " + decrypted);
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
}
}
public void afterPropertiesSet() throws Exception {
if (provider == null) {
srand = SecureRandom.getInstance(algorithm);
} else {
srand = SecureRandom.getInstance(algorithm, provider);
}
}
@Override
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String param = "";
java.util.Enumeration<String> headers = request.getHeaders("foo");
if (headers.hasMoreElements()) {
param = headers.nextElement(); // just grab first element
}
String bar = doSomething(param);
try {
java.security.SecureRandom secureRandomGenerator =
java.security.SecureRandom.getInstance("SHA1PRNG");
// Get 40 random bytes
byte[] randomBytes = new byte[40];
secureRandomGenerator.nextBytes(randomBytes);
response.getWriter().println("Random bytes are: " + new String(randomBytes));
} catch (java.security.NoSuchAlgorithmException e) {
System.out.println("Problem executing SecureRandom.nextBytes() - TestCase");
throw new ServletException(e);
} finally {
response
.getWriter()
.println("Randomness Test java.security.SecureRandom.nextBytes(byte[]) executed");
}
} // end doPost
/* goodG2B2() - use goodsource and badsink by reversing statements in first if */
private void goodG2B2() throws Throwable {
String data;
/* INCIDENTAL: CWE 571 Statement is Always True */
if (private_final_t) {
java.util.logging.Logger log_good = java.util.logging.Logger.getLogger("local-logger");
/* FIX: Use a hardcoded string */
data = "foo";
} else {
/* INCIDENTAL: CWE 561 Dead Code, the code below will never run */
Logger log_bad = Logger.getLogger("local-logger");
data = ""; /* init data */
/* read user input from console with readLine*/
BufferedReader buffread = null;
InputStreamReader instrread = null;
try {
instrread = new InputStreamReader(System.in);
buffread = new BufferedReader(instrread);
data = buffread.readLine();
} catch (IOException ioe) {
log_bad.warning("Error with stream reading");
} finally {
/* clean up stream reading objects */
try {
if (buffread != null) {
buffread.close();
}
} catch (IOException ioe) {
log_bad.warning("Error closing buffread");
} finally {
try {
if (instrread != null) {
instrread.close();
}
} catch (IOException ioe) {
log_bad.warning("Error closing instrread");
}
}
}
}
/* INCIDENTAL: CWE 571 Statement is Always True */
if (private_final_t) {
MessageDigest hash = MessageDigest.getInstance("SHA-512");
hash.update(data.getBytes()); /* FLAW: SHA512 with a predictable salt */
byte[] hashv = hash.digest("hash me".getBytes());
IO.writeLine(IO.toHex(hashv));
} else {
/* INCIDENTAL: CWE 561 Dead Code, the code below will never run */
SecureRandom r = new SecureRandom();
MessageDigest hash = MessageDigest.getInstance("SHA-512");
hash.update(r.getSeed(32)); /* FIX: Use a sufficiently random salt */
byte[] hashv = hash.digest("hash me".getBytes());
IO.writeLine(IO.toHex(hashv));
}
}
/**
* @tests javax.crypto.Cipher#getParameters()
* @tests javax.crypto.Cipher#init(int, java.security.Key, java.security.AlgorithmParameters,
* java.security.SecureRandom)
*/
public void test_getParameters() throws Exception {
/*
* If this test is changed, implement the following:
* test_initILjava_security_KeyLjava_security_AlgorithmParametersLjava_security_SecureRandom()
*/
SecureRandom sr = new SecureRandom();
Cipher cipher = null;
byte[] apEncoding = null;
byte[] iv = new byte[8];
sr.nextBytes(iv);
AlgorithmParameters ap = AlgorithmParameters.getInstance("DESede");
ap.init(iv, "RAW");
apEncoding = ap.getEncoded("ASN.1");
cipher = Cipher.getInstance(algorithm + "/CBC/PKCS5Padding");
cipher.init(Cipher.ENCRYPT_MODE, cipherKey, ap, sr);
byte[] cipherParmsEnc = cipher.getParameters().getEncoded("ASN.1");
assertTrue("Parameters differ", Arrays.equals(apEncoding, cipherParmsEnc));
}
/**
* Generate a random long value uniformly distributed between <code>lower</code> and <code>upper
* </code>, inclusive. This algorithm uses a secure random number generator.
*
* @param lower the lower bound.
* @param upper the upper bound.
* @return the random integer.
*/
public long nextSecureLong(long lower, long upper) {
if (lower >= upper) {
throw new IllegalArgumentException("lower bound must be < upper bound");
}
SecureRandom sec = getSecRan();
return lower + (long) (sec.nextDouble() * (upper - lower + 1));
}
private static byte[] key(final byte[] key) throws Exception {
final KeyGenerator gen = KeyGenerator.getInstance(ALGORITHM);
final SecureRandom sr = SecureRandom.getInstance("SHA1PRNG");
sr.setSeed(key);
gen.init(128, sr);
return gen.generateKey().getEncoded();
}
// ---------------------------------------------------------------
private byte[] getSalt(int saltSize) throws NoSuchAlgorithmException, NoSuchProviderException {
// SecureRandom sr = SecureRandom.getInstance( SECURE_RANDOM_ALGORITHM,
// SECURITY_PROVIDER );
SecureRandom sr = new SecureRandom();
sr.setSeed(System.currentTimeMillis());
return sr.generateSeed(saltSize);
}
/**
* Changes the internal state to a new, fully-random version that should have no relation to the
* previous state. May be somewhat slow; you shouldn't need to call this often.
*/
public void randomize() {
byte[] bytes = sec.generateSeed(128);
for (int i = sec.nextInt() & 127, c = 0; c < 128; c++, i = i + 1 & 127) {
state[i & 15] |= bytes[c] << ((i >> 4) << 3);
}
choice = sec.nextInt(16);
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ByteArrayOutputStream baos = new ByteArrayOutputStream();
Bitmap bm = null;
bm.compress(Bitmap.CompressFormat.PNG, 100, baos); // bm is the bitmap object
byte[] b = baos.toByteArray();
byte[] keyStart = "this is a key".getBytes();
KeyGenerator kgen;
try {
kgen = KeyGenerator.getInstance("AES");
SecureRandom sr = SecureRandom.getInstance("SHA1PRNG");
sr.setSeed(keyStart);
kgen.init(128, sr); // 192 and 256 bits may not be available
SecretKey skey = kgen.generateKey();
byte[] key = skey.getEncoded();
// encrypt
byte[] encryptedData = encrypt(key, b);
// decrypt
byte[] decryptedData = decrypt(key, encryptedData);
} catch (NoSuchAlgorithmException e) {
// TODO 自動產生的 catch 區塊
e.printStackTrace();
} catch (Exception e) {
// TODO 自動產生的 catch 區塊
e.printStackTrace();
}
}
/** @return Creates a unique path to an activity in the form of 2010-01-21-09-randombit */
public static String createId() {
Calendar c = Calendar.getInstance();
String[] vals = new String[4];
vals[0] = "" + c.get(Calendar.YEAR);
vals[1] = StringUtils.leftPad("" + (c.get(Calendar.MONTH) + 1), 2, "0");
vals[2] = StringUtils.leftPad("" + c.get(Calendar.DAY_OF_MONTH), 2, "0");
vals[3] = StringUtils.leftPad("" + c.get(Calendar.HOUR_OF_DAY), 2, "0");
StringBuilder id = new StringBuilder();
for (String v : vals) {
id.append(v).append("-");
}
byte[] bytes = new byte[20];
String randomHash = "";
try {
if (random == null) {
random = SecureRandom.getInstance("SHA1PRNG");
}
random.nextBytes(bytes);
randomHash = Arrays.toString(bytes);
randomHash = org.sakaiproject.nakamura.util.StringUtils.sha1Hash(randomHash);
} catch (NoSuchAlgorithmException e) {
} catch (UnsupportedEncodingException e) {
}
id.append(randomHash);
return id.toString();
}
private static byte[] randomBytes(int length) throws GeneralSecurityException {
fixPrng();
SecureRandom random = SecureRandom.getInstance(RANDOM_ALGORITHM);
byte[] b = new byte[length];
random.nextBytes(b);
return b;
}
/**
* Generate a UUID using <a href="http://www.ietf.org/rfc/rfc4122.txt">RFC 4122</a> UUID
* generation of a type 4 or randomly generated UUID.
*
* @return the 32 character long UUID string.
* @throws KeyManagerException
*/
protected String generateUUID() throws KeyManagerException {
byte vfour[] = new byte[KEY_LENGTH];
if (isRandomMode() == SECURE) {
if (secureRandom == null) {
try {
secureRandom = SecureRandom.getInstance("SHA1PRNG");
} catch (NoSuchAlgorithmException e) {
setRandomMode(!SECURE);
log.warn("Unable to use SecureRandom", e);
}
}
if (isRandomMode() == SECURE) {
secureRandom.nextBytes(vfour);
}
}
if (isRandomMode() != SECURE) {
if (random == null) {
random = new Random();
}
random.nextBytes(vfour);
}
vfour[6] &= 0x0F;
vfour[6] |= (4 << 4);
vfour[8] &= 0x3F;
vfour[8] |= 0x80;
return Hex.encode(vfour);
}
/**
* This method: Encrypts bytes using a cipher. Generates MAC for intialization vector of the
* cipher Generates MAC for encrypted data Returns a byte array consisting of the following
* concatenated together: |MAC for cnrypted Data | MAC for Init Vector | Encrypted Data |
*
* @param bytes The byte array to be encrypted.
* @return the encrypted byte array.
*/
public byte[] encrypt(byte[] bytes) {
byte[] securedata = null;
try {
// Generate IV
SecureRandom rand = new SecureRandom();
byte[] iv = new byte[16];
rand.nextBytes(iv);
IvParameterSpec ivspec = new IvParameterSpec(iv);
Cipher encryptCipher = Cipher.getInstance(CIPHER_CODE);
encryptCipher.init(Cipher.ENCRYPT_MODE, sk, ivspec);
Mac encryptMac = Mac.getInstance(MAC_CODE);
encryptMac.init(sk);
encryptMac.update(iv);
// encrypt the plaintext
byte[] encdata = encryptCipher.doFinal(bytes);
byte[] macBytes = encryptMac.doFinal(encdata);
byte[] tmp = concatBytes(macBytes, iv);
securedata = concatBytes(tmp, encdata);
} catch (NoSuchAlgorithmException
| NoSuchPaddingException
| InvalidKeyException
| InvalidAlgorithmParameterException
| IllegalStateException
| IllegalBlockSizeException
| BadPaddingException e) {
if (LOGGER.isLoggable(Level.SEVERE)) {
LOGGER.log(
Level.SEVERE,
"Unexpected exception initializing encryption." + " No encryption will be performed.",
e);
}
return null;
}
return securedata;
}
public Id generateId() throws Exception {
MessageDigest md = MessageDigest.getInstance(ds().network.getProperty("hash", "SHA-1"));
SecureRandom random = SecureRandom.getInstance("SHA1PRNG");
byte[] input = new byte[200];
random.nextBytes(input);
return new Id(md.digest(input));
}
