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:net.firejack.platform.core.utils.SecurityHelper.java

/**
 * generate random sequence//  w w  w  . jav a  2 s.  c  o  m
 *
 * @param length lengh of sequence to generate
 * @return Generated random sequence
 */
public static String generateRandomSequence(int length) {

    String password = "";

    try {
        SecureRandom random = SecureRandom.getInstance("SHA1PRNG");

        for (int i = 0; i < length; i++) {
            char ch = 0;

            int j = random.nextInt(3);

            switch (j) {
            case 0:
                ch = (char) (97 + random.nextInt(26));
                break;
            case 1:
                ch = (char) (65 + random.nextInt(26));
                break;
            case 2:
                ch = (char) (48 + random.nextInt(10));
                break;
            }
            password += ch;
        }

    } catch (NoSuchAlgorithmException e) {
        LOGGER.info("Couldn't create new instance of SecureRandom class", e);
        throw new RuntimeException(e);
    }

    return password;
}

---

From source file:org.wso2.carbon.identity.authenticator.smsotp.OneTimePassword.java

/**
 *
 * @param size digit size of the number/*from www.ja v a2 s  .c o  m*/
 * @return token
 */
public static String getRandomNumber(int size) {

    StringBuilder generatedToken = new StringBuilder();
    try {
        SecureRandom number = SecureRandom.getInstance(SMSOTPConstants.ALGORITHM_NAME);
        // Generate 20 integers 0..20
        for (int i = 0; i < size; i++) {
            generatedToken.append(number.nextInt(9));
        }
    } catch (NoSuchAlgorithmException e) {
        log.error("Unable to find the Algorithm", e);
    }

    return generatedToken.toString();
}

---

From source file:org.wso2.carbon.identity.authenticator.emailotp.OneTimePassword.java

public static String getRandomNumber(int size) {

    StringBuilder generatedToken = new StringBuilder();
    try {/*from w w  w  .ja  v a  2s  . c om*/
        SecureRandom number = SecureRandom.getInstance(EmailOTPAuthenticatorConstants.ALGORITHM_NAME);
        // Generate 20 integers 0..20
        for (int i = 0; i < size; i++) {
            generatedToken.append(number.nextInt(9));
        }
    } catch (NoSuchAlgorithmException e) {
        log.error("Unable to find the Algorithm", e);
    }

    return generatedToken.toString();
}

---

From source file:RandomUtil.java

/**
 * Generates a secure random word with the given length.
 * /*from w w w . j av  a  2s .  c  om*/
 * @param len Amount of random characters to generate
 * @param alphabet Alphabet to generate from.
 * @return random Word containing letters and numbers.
 */
public static String createWord(int len, char[] alphabet) {
    SecureRandom random = createSecureRandom();

    if (alphabet == null) {
        alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890".toCharArray();
    }

    StringBuffer out = new StringBuffer(len);
    for (int i = 0; i < len; i++) {
        out.append(alphabet[random.nextInt(alphabet.length)]);
    }

    return out.toString();
}

---

From source file:jp.go.nict.langrid.management.web.utility.StringUtil.java

/**
 * // www .j  a v  a  2 s.  com
 * 
 */
public static String randomPassword(int size) {
    SecureRandom random = new SecureRandom();
    char[] pass = new char[size];
    for (int k = 0; k < pass.length; k++) {
        switch (random.nextInt(3)) {
        case 0: // 'a' - 'z'
            pass[k] = (char) (97 + random.nextInt(26));
            break;
        case 1: // 'A' - 'Z'
            pass[k] = (char) (65 + random.nextInt(26));
            break;
        case 2: // '0' - '9'
            pass[k] = (char) (48 + random.nextInt(10));
            break;
        default:
            pass[k] = 'a';
        }
    }
    return new String(pass);
}

---

From source file:org.eclipse.om2m.core.controller.Controller.java

/**
 * Generates an random ID based on SecureRandom library
 * @param prefix - prefix of the resource ID
 * @param postfix - postfix of the resource ID
 * @return generated resource ID//from w  w w .j  ava 2  s  .  co  m
 */
public static String generateId(String prefix, String postfix) {
    SecureRandom secureRandom = new SecureRandom();
    return prefix + String.valueOf(secureRandom.nextInt(999999999)) + postfix;
}

---

From source file:org.jahia.params.valves.CookieAuthValveImpl.java

public static String generateRandomString(int length) {
    SecureRandom randomGen = new SecureRandom();
    StringBuilder result = new StringBuilder();
    int count = 0;
    while (count < length) {
        int randomSel = randomGen.nextInt(3);
        int randomInt = randomGen.nextInt(26);
        char randomChar = '0';
        switch (randomSel) {
        case 0://  w ww  . j  a  va2  s. c o  m
            randomChar = (char) (((int) 'A') + randomInt);
            break;
        case 1:
            randomChar = (char) (((int) 'a') + randomInt);
            break;
        case 2:
            randomChar = (char) (((int) '0') + (randomInt % 10));
            break;
        }
        result.append(randomChar);
        count++;
    }
    return result.toString();
}

---

From source file:burrito.util.StringUtils.java

/**
 * Genererar en random strng//from  w w  w  .  ja v  a2  s .c  om
 * @param length
 * @return
 */
public static String generateRandomString(int length) {
    try {
        SecureRandom random = SecureRandom.getInstance("SHA1PRNG");
        char[] chars = new char[length];

        for (int i = 0; i < length; i++) {
            chars[i] = randomStringAlphabet[random.nextInt(randomStringAlphabet.length)];
        }

        return String.valueOf(chars);
    } catch (NoSuchAlgorithmException e) {
        throw new RuntimeException(e);
    }
}

---

From source file:io.stallion.utils.GeneralUtils.java

public static String secureRandomNumeric(int length) {
    SecureRandom test = new SecureRandom();
    int result = test.nextInt(((Double) Math.pow(10, length)).intValue());
    String resultStr = result + "";
    if (resultStr.length() != length)
        for (int x = resultStr.length(); x < length; x++)
            resultStr = "0" + resultStr;
    return resultStr;
}

---

From source file:com.zimbra.common.util.RandomPassword.java

public static String generate(int minLength, int maxLength, String alphabet) {
    SecureRandom random = new SecureRandom();

    // Calculate the desired length of the password
    int length;/*from   w  w  w  .  ja v a 2s  . c o m*/
    if (minLength > maxLength) {
        throw new IllegalArgumentException("minLength=" + minLength + " > maxLength=" + maxLength);
    } else if (minLength < maxLength) {
        length = minLength + random.nextInt(1 + maxLength - minLength);
    } else {
        length = maxLength;
    }

    int alphabetLength = alphabet.length();
    int limit = byteLimit(alphabetLength);

    StringBuffer password = new StringBuffer(length);
    byte[] randomByte = new byte[1];

    while (password.length() < length) {
        random.nextBytes(randomByte);
        int i = randomByte[0] + 128;
        if (i < limit) {
            password.append(alphabet.charAt(i % alphabetLength));
        }
    }

    return password.toString();
}

---

• «
• 1
• 2
• 3
• 4
• 5
• 6
• 7
• »