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| <div class="subTitle">org.apache.shiro.crypto.hash</div> |
| <h2 title="Interface HashService" class="title">Interface HashService</h2> |
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| <dt>All Known Subinterfaces:</dt> |
| <dd><a href="../../../../../org/apache/shiro/crypto/hash/ConfigurableHashService.html" title="interface in org.apache.shiro.crypto.hash">ConfigurableHashService</a></dd> |
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| <dt>All Known Implementing Classes:</dt> |
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| <pre>public interface <a href="../../../../../src-html/org/apache/shiro/crypto/hash/HashService.html#line.53">HashService</a></pre> |
| <div class="block">A <code>HashService</code> hashes input sources utilizing a particular hashing strategy. |
| <p/> |
| A <code>HashService</code> sits at a higher architectural level than Shiro's simple <a href="../../../../../org/apache/shiro/crypto/hash/Hash.html" title="interface in org.apache.shiro.crypto.hash"><code>Hash</code></a> classes: it allows |
| for salting and iteration-related strategies to be configured and internalized in a |
| single component that can be re-used in multiple places in the application. |
| <p/> |
| For example, for the most secure hashes, it is highly recommended to use a randomly generated salt, potentially |
| paired with an configuration-specific private salt, in addition to using multiple hash iterations. |
| <p/> |
| While one can do this easily enough using Shiro's <a href="../../../../../org/apache/shiro/crypto/hash/Hash.html" title="interface in org.apache.shiro.crypto.hash"><code>Hash</code></a> implementations directly, this direct approach could |
| quickly lead to copy-and-paste behavior. For example, consider this logic which might need to repeated in an |
| application: |
| <pre> |
| int numHashIterations = ... |
| ByteSource privateSalt = ... |
| ByteSource randomSalt = <a href="../../../../../org/apache/shiro/crypto/RandomNumberGenerator.html" title="interface in org.apache.shiro.crypto"><code>randomNumberGenerator</code></a>.nextBytes(); |
| ByteSource combined = combine(privateSalt, randomSalt); |
| Hash hash = Sha512Hash(source, combined, numHashIterations); |
| save(hash); |
| </pre> |
| In this example, often only the input source will change during runtime, while the hashing strategy (how salts |
| are generated or acquired, how many hash iterations will be performed, etc) usually remain consistent. A HashService |
| internalizes this logic so the above becomes simply this: |
| <pre> |
| HashRequest request = new HashRequest.Builder().source(source).build(); |
| Hash result = hashService.hash(request); |
| save(result); |
| </pre></div> |
| <dl> |
| <dt><span class="simpleTagLabel">Since:</span></dt> |
| <dd>1.2</dd> |
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| <td class="colFirst"><code><a href="../../../../../org/apache/shiro/crypto/hash/Hash.html" title="interface in org.apache.shiro.crypto.hash">Hash</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/shiro/crypto/hash/HashService.html#computeHash-org.apache.shiro.crypto.hash.HashRequest-">computeHash</a></span>(<a href="../../../../../org/apache/shiro/crypto/hash/HashRequest.html" title="interface in org.apache.shiro.crypto.hash">HashRequest</a> request)</code> |
| <div class="block">Computes a hash based on the given request.</div> |
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| <h4>computeHash</h4> |
| <pre><a href="../../../../../org/apache/shiro/crypto/hash/Hash.html" title="interface in org.apache.shiro.crypto.hash">Hash</a> <a href="../../../../../src-html/org/apache/shiro/crypto/hash/HashService.html#line.76">computeHash</a>(<a href="../../../../../org/apache/shiro/crypto/hash/HashRequest.html" title="interface in org.apache.shiro.crypto.hash">HashRequest</a> request)</pre> |
| <div class="block">Computes a hash based on the given request. |
| |
| <h3>Salt Notice</h3> |
| |
| If a salt accompanies the return value |
| (i.e. <code>returnedHash.<a href="../../../../../org/apache/shiro/crypto/hash/Hash.html#getSalt--"><code>getSalt()</code></a> != null</code>), this |
| same exact salt <b><em>MUST</em></b> be presented back to the <code>HashService</code> if hash |
| comparison/verification will be performed at a later time (for example, for password hash or file checksum |
| comparison). |
| <p/> |
| For additional security, the <code>HashService</code>'s internal implementation may use more complex salting |
| strategies than what would be achieved by computing a <code>Hash</code> manually. |
| <p/> |
| In summary, if a <a href="../../../../../org/apache/shiro/crypto/hash/HashService.html" title="interface in org.apache.shiro.crypto.hash"><code>HashService</code></a> returns a salt in a returned Hash, it is expected that the same salt |
| will be provided to the same <code>HashService</code> instance.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>request</code> - the request to process</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the hashed data</dd> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../../org/apache/shiro/crypto/hash/Hash.html#getSalt--"><code>Hash.getSalt()</code></a></dd> |
| </dl> |
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