Example usage for java.security SecureRandom nextInt

Introduction

In this page you can find the example usage for java.security SecureRandom nextInt.

Prototype

public int nextInt(int bound) 

Source Link

Document

Returns a pseudorandom, uniformly distributed int value between 0 (inclusive) and the specified value (exclusive), drawn from this random number generator's sequence.

Usage

From source file:egovframework.rte.tex.com.service.EgovStringUtil.java

License:asdf

/**
 * ? A? Z?? ? ??  ?  ? ? ??/*from   w w  w  . j a v a2s . c  o  m*/
 * ? ??  
 * @param startChr
 *        -  ?
 * @param endChr
 *        - ?
 * @return ??
 * @exception MyException
 * @see
 */
public static String getRandomStr(char startChr, char endChr) {

    int randomInt;
    String randomStr = null;

    // ? ? ? ? .
    int startInt = Integer.valueOf(startChr);
    int endInt = Integer.valueOf(endChr);

    // ?? ? ?
    if (startInt > endInt) {

        throw new IllegalArgumentException("Start String: " + startChr + " End String: " + endChr);
    }

    try {

        // ? ? ?
        SecureRandom rnd = new SecureRandom();

        do {

            // ? ? ? ? ? ? ?.
            randomInt = rnd.nextInt(endInt + 1);

        } while (randomInt < startInt); // ? ?
        // 'A'(65)
        //  
        // ? ?
        // ?.

        // ? ? ?   ?  
        randomStr = (char) randomInt + "";

    } catch (Exception e) {

        log.debug(e.getMessage());

    }

    // ?? 
    return randomStr;

}

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From source file:org.sufficientlysecure.keychain.ui.CreateYubiKeyPinFragment.java

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.create_yubi_key_pin_fragment, container, false);

    mPin = (TextView) view.findViewById(R.id.create_yubi_key_pin);
    mAdminPin = (TextView) view.findViewById(R.id.create_yubi_key_admin_pin);
    mBackButton = view.findViewById(R.id.create_key_back_button);
    mNextButton = view.findViewById(R.id.create_key_next_button);

    if (mCreateKeyActivity.mYubiKeyPin == null) {
        new AsyncTask<Void, Void, Pair<Passphrase, Passphrase>>() {
            @Override// ww  w  .  ja  v  a  2  s . co m
            protected Pair<Passphrase, Passphrase> doInBackground(Void... unused) {
                SecureRandom secureRandom = new SecureRandom();
                // min = 6, we choose 6
                String pin = "" + secureRandom.nextInt(9) + secureRandom.nextInt(9) + secureRandom.nextInt(9)
                        + secureRandom.nextInt(9) + secureRandom.nextInt(9) + secureRandom.nextInt(9);
                // min = 8, we choose 10, but 6 are equals the PIN
                String adminPin = pin + secureRandom.nextInt(9) + secureRandom.nextInt(9)
                        + secureRandom.nextInt(9) + secureRandom.nextInt(9);

                return new Pair<>(new Passphrase(pin), new Passphrase(adminPin));
            }

            @Override
            protected void onPostExecute(Pair<Passphrase, Passphrase> pair) {
                mCreateKeyActivity.mYubiKeyPin = pair.first;
                mCreateKeyActivity.mYubiKeyAdminPin = pair.second;

                mPin.setText(mCreateKeyActivity.mYubiKeyPin.toStringUnsafe());
                mAdminPin.setText(mCreateKeyActivity.mYubiKeyAdminPin.toStringUnsafe());
            }
        }.execute();
    } else {
        mPin.setText(mCreateKeyActivity.mYubiKeyPin.toStringUnsafe());
        mAdminPin.setText(mCreateKeyActivity.mYubiKeyAdminPin.toStringUnsafe());
    }

    mBackButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            back();
        }
    });
    mNextButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            nextClicked();
        }
    });

    return view;
}

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From source file:org.wso2.carbon.device.mgt.iot.virtualfirealarm.agent.virtual.VirtualHardwareManager.java

private int getRandom(int max, int min, int current, boolean isSmoothed, int svf) {
    if (isSmoothed) {
        int offset = (max - min) * svf / 100;
        double mx = current + offset;
        max = (mx > max) ? max : (int) Math.round(mx);
        double mn = current - offset;
        min = (mn < min) ? min : (int) Math.round(mn);
    }/*from w w  w  . j av  a  2 s.co  m*/
    try {
        SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG");
        return secureRandom.nextInt(max - min) + min;
    } catch (NoSuchAlgorithmException e) {
        throw new RuntimeException("SHA1PRNG algorithm could not be found.");
    }
}

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From source file:com.LaunchKeyManager.http.SimpleMultipartEntity.java

public SimpleMultipartEntity() {
    final StringBuffer buf = new StringBuffer();
    final SecureRandom rand = new SecureRandom();
    for (int i = 0; i < 30; i++) {
        buf.append(MULTIPART_CHARS[rand.nextInt(MULTIPART_CHARS.length)]);
    }//from  w w  w .  java  2  s  .c o  m
    this.boundary = buf.toString();

}

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From source file:com._17od.upm.gui.AccountDialog.java

/**
 * This method takes as input the user's preferences about password length,
 * including or excluding Escape Characters, and randomly generates a
 * password. Then, the method returns the generated password as a String.
 *
 * @param PassLength/*from  ww  w . jav a 2  s.c  om*/
 * @param InclEscChars
 * @return passwordBuffer.toString()
 */
private static String GeneratePassword(int PassLength, boolean InclEscChars) {
    SecureRandom random = new SecureRandom();
    StringBuffer passwordBuffer = new StringBuffer();

    if (InclEscChars) {
        for (int i = 0; i < PassLength; i++) {
            passwordBuffer.append(EXTRA_ALLOWED_CHARS[random.nextInt(EXTRA_ALLOWED_CHARS.length)]);
        }
        return passwordBuffer.toString();

    } else {
        for (int i = 0; i < PassLength; i++) {
            passwordBuffer.append(ALLOWED_CHARS[random.nextInt(ALLOWED_CHARS.length)]);
        }
        return passwordBuffer.toString();
    }
}

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From source file:es.logongas.openshift.ant.JenkinsPasswordHashPropertyTask.java

/**
 * The MIT License// www  . ja va 2 s  .c o m
 * 
 * Copyright (c) 2004-2010, Sun Microsystems, Inc., Kohsuke Kawaguchi, David Calavera, Seiji Sogabe
 * Generates random salt.
 */
private String generateSalt() {
    StringBuilder buf = new StringBuilder();
    SecureRandom sr = new SecureRandom();
    for (int i = 0; i < 6; i++) {// log2(52^6)=34.20... so, this is about 32bit strong.
        boolean upper = sr.nextBoolean();
        char ch = (char) (sr.nextInt(26) + 'a');
        if (upper) {
            ch = Character.toUpperCase(ch);
        }
        buf.append(ch);
    }
    return buf.toString();
}

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From source file:hudson.scm.credential.SshPublicKeyCredential.java

/**
 * @param keyFile stores SSH private key. The file will be copied.
 *//*from w  w  w  .java 2  s  .c om*/
public SshPublicKeyCredential(String userName, String passphrase, File keyFile) throws SVNException {
    this.userName = userName;
    this.passphrase = Scrambler.scramble(passphrase);

    SecureRandom r = new SecureRandom();
    StringBuilder buf = new StringBuilder();
    for (int i = 0; i < 16; i++) {
        buf.append(Integer.toHexString(r.nextInt(16)));
    }
    this.id = buf.toString();

    try {
        File savedKeyFile = getKeyFile();
        System.out.println(keyFile.getAbsolutePath());
        System.out.println(savedKeyFile.getAbsolutePath());
        FileUtils.copyFile(keyFile, savedKeyFile);
        setFilePermissions(savedKeyFile, "600");
    } catch (IOException e) {
        throw new SVNException(SVNErrorMessage.create(SVNErrorCode.AUTHN_CREDS_UNAVAILABLE,
                Messages.SshPublicKeyCredential_private_key_save_error()), e);
    }
}

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From source file:org.wso2.carbon.identity.recovery.handler.AdminForcedPasswordResetHandler.java

private String generateOTPValue() {
    char[] chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789".toCharArray();
    SecureRandom rnd = new SecureRandom();
    StringBuilder sb = new StringBuilder("");
    for (int i = 0; i < 6; i++) {
        sb.append(chars[rnd.nextInt(chars.length)]);
    }/*from w w w .  ja va2s . c  o  m*/
    return sb.toString();
}

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From source file:org.sufficientlysecure.keychain.ui.CreateSecurityTokenPinFragment.java

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.create_yubi_key_pin_fragment, container, false);

    mPin = (EditText) view.findViewById(R.id.create_yubi_key_pin);
    mPinRepeat = (EditText) view.findViewById(R.id.create_yubi_key_pin_repeat);
    mAdminPin = (TextView) view.findViewById(R.id.create_yubi_key_admin_pin);
    mBackButton = view.findViewById(R.id.create_key_back_button);
    mNextButton = view.findViewById(R.id.create_key_next_button);

    if (mCreateKeyActivity.mSecurityTokenPin == null) {
        new AsyncTask<Void, Void, Passphrase>() {
            @Override/*from w ww .  j a v  a  2  s  .  c  o m*/
            protected Passphrase doInBackground(Void... unused) {
                SecureRandom secureRandom = new SecureRandom();
                // min = 8, we choose 8
                String adminPin = "" + secureRandom.nextInt(9) + secureRandom.nextInt(9)
                        + secureRandom.nextInt(9) + secureRandom.nextInt(9) + secureRandom.nextInt(9)
                        + secureRandom.nextInt(9) + secureRandom.nextInt(9) + secureRandom.nextInt(9);

                return new Passphrase(adminPin);
            }

            @Override
            protected void onPostExecute(Passphrase adminPin) {
                mCreateKeyActivity.mSecurityTokenAdminPin = adminPin;

                mAdminPin.setText(mCreateKeyActivity.mSecurityTokenAdminPin.toStringUnsafe());
            }
        }.execute();
    } else {
        mAdminPin.setText(mCreateKeyActivity.mSecurityTokenAdminPin.toStringUnsafe());
    }

    mPin.requestFocus();
    mBackButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            back();
        }
    });
    mNextButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            nextClicked();
        }
    });

    return view;
}

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From source file:de.metas.procurement.webui.service.impl.LoginService.java

private final String generatePassword(final int passwordLength) {
    Preconditions.checkArgument(passwordLength >= 4, "paswordLength shall be at least 4");
    final StringBuilder password = new StringBuilder();
    final SecureRandom random = new SecureRandom();
    final int poolLength = PASSWORD_CHARS.length();
    for (int i = 0; i < passwordLength; i++) {
        final int charIndex = random.nextInt(poolLength);
        final char ch = PASSWORD_CHARS.charAt(charIndex);
        password.append(ch);/*  w  w w  .j ava  2  s. com*/
    }

    return password.toString();
}

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