com.payneteasy.superfly.password.PasswordGeneratorImpl Maven / Gradle / Ivy

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package com.payneteasy.superfly.password;

import java.security.SecureRandom;

/**
 * Generates passwords using a {@link SecureRandom}.
 *
 * @author Roman Puchkovskiy
 */
public class PasswordGeneratorImpl implements PasswordGenerator {

    private SecureRandom random = new SecureRandom();

    private int passwordLength = 6;

    public void setPasswordLength(int length) {
        passwordLength = length;
    }

    public String generate() {
        StringBuilder buf = new StringBuilder();
        for (int i = 0; i < passwordLength; i++) {
            char ch;
            do {
                int n = random.nextInt(62);
                if (n < 10) {
                    ch = (char) (n + '0');
                } else if (n < 36) {
                    ch = (char) (n - 10 + 'a');
                } else {
                    ch = (char) (n - 36 + 'A');
                }
            } while (ch == 'o' || ch == 'O' || ch == 'l' || ch == 'I');
            buf.append(ch);
        }
        return buf.toString();
    }

}