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| <div class="subTitle">org.apache.shiro.crypto</div> |
| <h2 title="Interface RandomNumberGenerator" class="title">Interface RandomNumberGenerator</h2> |
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| <pre>public interface <a href="../../../../src-html/org/apache/shiro/crypto/RandomNumberGenerator.html#line.49">RandomNumberGenerator</a></pre> |
| <div class="block">A component that can generate random number/byte values as needed. Useful in cryptography or security scenarios |
| where random byte arrays are needed, such as for password salts, nonces, initialization vectors and other seeds. |
| <p/> |
| This is essentially the same as a <a href="https://docs.oracle.com/javase/6/docs/api/java/security/SecureRandom.html?is-external=true" title="class or interface in java.security"><code>SecureRandom</code></a>, and indeed implementations |
| of this interface will probably all use <a href="https://docs.oracle.com/javase/6/docs/api/java/security/SecureRandom.html?is-external=true" title="class or interface in java.security"><code>SecureRandom</code></a> instances, but this |
| interface provides a few additional benefits to end-users: |
| <ul> |
| <li>It is an interface rather than the JDK's <code>SecureRandom</code> concrete implementation. Implementation details |
| can be customized as necessary based on the application's needs</li> |
| <li>Default per-instance behavior can be customized on implementations, typically via JavaBeans mutators.</li> |
| <li>Perhaps most important for Shiro end-users, tt can more easily be used as a source of cryptographic seed data, |
| and the data returned is already in a more convenient <code>ByteSource</code> format in case that data needs |
| to be <code>hex</code> or |
| <code>base64</code>-encoded.</li> |
| </ul> |
| For example, consider the following example generating password salts for new user accounts: |
| <pre> |
| RandomNumberGenerator saltGenerator = new <a href="../../../../org/apache/shiro/crypto/SecureRandomNumberGenerator.html" title="class in org.apache.shiro.crypto"><code>SecureRandomNumberGenerator</code></a>(); |
| User user = new User(); |
| user.setPasswordSalt(saltGenerator.nextBytes().toBase64()); |
| userDAO.save(user); |
| </pre></div> |
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| <dt><span class="simpleTagLabel">Since:</span></dt> |
| <dd>1.1</dd> |
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| <td class="colFirst"><code>org.apache.shiro.util.ByteSource</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/shiro/crypto/RandomNumberGenerator.html#nextBytes--">nextBytes</a></span>()</code> |
| <div class="block">Generates a byte array of fixed length filled with random data, often useful for generating salts, |
| initialization vectors or other seed data.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>org.apache.shiro.util.ByteSource</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/shiro/crypto/RandomNumberGenerator.html#nextBytes-int-">nextBytes</a></span>(int numBytes)</code> |
| <div class="block">Generates a byte array of the specified length filled with random data.</div> |
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| <h4>nextBytes</h4> |
| <pre>org.apache.shiro.util.ByteSource <a href="../../../../src-html/org/apache/shiro/crypto/RandomNumberGenerator.html#line.62">nextBytes</a>()</pre> |
| <div class="block">Generates a byte array of fixed length filled with random data, often useful for generating salts, |
| initialization vectors or other seed data. The length is specified as a configuration |
| value on the underlying implementation. |
| <p/> |
| If you'd like per-invocation control the number of bytes generated, use the |
| <a href="../../../../org/apache/shiro/crypto/RandomNumberGenerator.html#nextBytes-int-"><code>nextBytes(int)</code></a> method instead.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>a byte array of fixed length filled with random data.</dd> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../org/apache/shiro/crypto/RandomNumberGenerator.html#nextBytes-int-"><code>nextBytes(int)</code></a></dd> |
| </dl> |
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| <h4>nextBytes</h4> |
| <pre>org.apache.shiro.util.ByteSource <a href="../../../../src-html/org/apache/shiro/crypto/RandomNumberGenerator.html#line.71">nextBytes</a>(int numBytes)</pre> |
| <div class="block">Generates a byte array of the specified length filled with random data.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>numBytes</code> - the number of bytes to be populated with random data.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>a byte array of the specified length filled with random data.</dd> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../org/apache/shiro/crypto/RandomNumberGenerator.html#nextBytes--"><code>nextBytes()</code></a></dd> |
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