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| <div class="subTitle"><span class="packageLabelInType">Package</span> <a href="package-summary.html">org.apache.shiro.crypto</a></div> |
| <h2 title="Interface CipherService" class="title">Interface CipherService</h2> |
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| <dl> |
| <dt>All Known Implementing Classes:</dt> |
| <dd><code><a href="AbstractSymmetricCipherService.html" title="class in org.apache.shiro.crypto">AbstractSymmetricCipherService</a></code>, <code><a href="AesCipherService.html" title="class in org.apache.shiro.crypto">AesCipherService</a></code>, <code><a href="BlowfishCipherService.html" title="class in org.apache.shiro.crypto">BlowfishCipherService</a></code>, <code><a href="DefaultBlockCipherService.html" title="class in org.apache.shiro.crypto">DefaultBlockCipherService</a></code>, <code><a href="JcaCipherService.html" title="class in org.apache.shiro.crypto">JcaCipherService</a></code></dd> |
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| <pre>public interface <a href="../../../../src-html/org/apache/shiro/crypto/CipherService.html#line.87">CipherService</a></pre> |
| <div class="block">A <code>CipherService</code> uses a cryptographic algorithm called a |
| <a href="http://en.wikipedia.org/wiki/Cipher">Cipher</a> to convert an original input source using a <code>key</code> to |
| an uninterpretable format. The resulting encrypted output is only able to be converted back to original form with |
| a <code>key</code> as well. <code>CipherService</code>s can perform both encryption and decryption. |
| <h2>Cipher Basics</h2> |
| For what is known as <em>Symmetric</em> <code>Cipher</code>s, the <code>Key</code> used to encrypt the source is the same |
| as (or trivially similar to) the <code>Key</code> used to decrypt it. |
| <p/> |
| For <em>Asymmetric</em> <code>Cipher</code>s, the encryption <code>Key</code> is not the same as the decryption <code>Key</code>. |
| The most common type of Asymmetric Ciphers are based on what is called public/private key pairs: |
| <p/> |
| A <em>private</em> key is known only to a single party, and as its name implies, is supposed be kept very private |
| and secure. A <em>public</em> key that is associated with the private key can be disseminated freely to anyone. |
| Then data encrypted by the public key can only be decrypted by the private key and vice versa, but neither party |
| need share their private key with anyone else. By not sharing a private key, you can guarantee no 3rd party can |
| intercept the key and therefore use it to decrypt a message. |
| <p/> |
| This asymmetric key technology was created as a |
| more secure alternative to symmetric ciphers that sometimes suffer from man-in-the-middle attacks since, for |
| data shared between two parties, the same Key must also be shared and may be compromised. |
| <p/> |
| Note that a symmetric cipher is perfectly fine to use if you just want to encode data in a format no one else |
| can understand and you never give away the key. Shiro uses a symmetric cipher when creating certain |
| HTTP Cookies for example - because it is often undesirable to have user's identity stored in a plain-text cookie, |
| that identity can be converted via a symmetric cipher. Since the the same exact Shiro application will receive |
| the cookie, it can decrypt it via the same <code>Key</code> and there is no potential for discovery since that Key |
| is never shared with anyone. |
| <h2><code>CipherService</code>s vs JDK <a href="https://docs.oracle.com/javase/8/docs/api/javax/crypto/Cipher.html?is-external=true" title="class or interface in javax.crypto" class="externalLink"><code>Cipher</code></a>s</h2> |
| Shiro <code>CipherService</code>s essentially do the same things as JDK <a href="https://docs.oracle.com/javase/8/docs/api/javax/crypto/Cipher.html?is-external=true" title="class or interface in javax.crypto" class="externalLink"><code>Cipher</code></a>s, but in |
| simpler and easier-to-use ways for most application developers. When thinking about encrypting and decrypting data |
| in an application, most app developers want what a <code>CipherService</code> provides, rather than having to manage the |
| lower-level intricacies of the JDK's <code>Cipher</code> API. Here are a few reasons why most people prefer |
| <code>CipherService</code>s: |
| <ul> |
| <li><b>Stateless Methods</b> - <code>CipherService</code> method calls do not retain state between method invocations. |
| JDK <code>Cipher</code> instances do retain state across invocations, requiring its end-users to manage the instance |
| and its state themselves.</li> |
| <li><b>Thread Safety</b> - <code>CipherService</code> instances are thread-safe inherently because no state is |
| retained across method invocations. JDK <code>Cipher</code> instances retain state and cannot be used by multiple |
| threads concurrently.</li> |
| <li><b>Single Operation</b> - <code>CipherService</code> method calls are single operation methods: encryption or |
| decryption in their entirety are done as a single method call. This is ideal for the large majority of developer |
| needs where you have something unencrypted and just want it decrypted (or vice versa) in a single method call. In |
| contrast, JDK <code>Cipher</code> instances can support encrypting/decrypting data in chunks over time (because it |
| retains state), but this often introduces API clutter and confusion for most application developers.</li> |
| <li><b>Type Safe</b> - There are <code>CipherService</code> implementations for different Cipher algorithms |
| (<code>AesCipherService</code>, <code>BlowfishCipherService</code>, etc). There is only one JDK <code>Cipher</code> class to |
| represent all cipher algorithms/instances. |
| <li><b>Simple Construction</b> - Because <code>CipherService</code> instances are type-safe, instantiating and using |
| one is often as simple as calling the default constructor, for example, <code>new AesCipherService();</code>. The |
| JDK <code>Cipher</code> class however requires using a procedural factory method with String arguments to indicate how |
| the instance should be created. The String arguments themselves are somewhat cryptic and hard to |
| understand unless you're a security expert. Shiro hides these details from you, but allows you to configure them |
| if you want.</li> |
| </ul></div> |
| <dl> |
| <dt><span class="simpleTagLabel">Since:</span></dt> |
| <dd>1.0</dd> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="BlowfishCipherService.html" title="class in org.apache.shiro.crypto"><code>BlowfishCipherService</code></a>, |
| <a href="AesCipherService.html" title="class in org.apache.shiro.crypto"><code>AesCipherService</code></a></dd> |
| </dl> |
| </li> |
| </ul> |
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| <h3>Method Summary</h3> |
| <table class="memberSummary"> |
| <caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd"> </span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd"> </span></span><span id="t3" class="tableTab"><span><a href="javascript:show(4);">Abstract Methods</a></span><span class="tabEnd"> </span></span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colSecond" scope="col">Method</th> |
| <th class="colLast" scope="col">Description</th> |
| </tr> |
| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code><a href="../util/ByteSource.html" title="interface in org.apache.shiro.util">ByteSource</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#decrypt(byte%5B%5D,byte%5B%5D)">decrypt</a></span>​(byte[] encrypted, |
| byte[] decryptionKey)</code></th> |
| <td class="colLast"> |
| <div class="block">Decrypts encrypted data via the specified cipher key and returns the original (pre-encrypted) data.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>void</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#decrypt(java.io.InputStream,java.io.OutputStream,byte%5B%5D)">decrypt</a></span>​(<a href="https://docs.oracle.com/javase/8/docs/api/java/io/InputStream.html?is-external=true" title="class or interface in java.io" class="externalLink">InputStream</a> in, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/io/OutputStream.html?is-external=true" title="class or interface in java.io" class="externalLink">OutputStream</a> out, |
| byte[] decryptionKey)</code></th> |
| <td class="colLast"> |
| <div class="block">Receives encrypted data from the given <code>InputStream</code>, decrypts it, and sends the resulting decrypted data |
| to the given <code>OutputStream</code>.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code><a href="../util/ByteSource.html" title="interface in org.apache.shiro.util">ByteSource</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#encrypt(byte%5B%5D,byte%5B%5D)">encrypt</a></span>​(byte[] raw, |
| byte[] encryptionKey)</code></th> |
| <td class="colLast"> |
| <div class="block">Encrypts data via the specified cipher key.</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>void</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#encrypt(java.io.InputStream,java.io.OutputStream,byte%5B%5D)">encrypt</a></span>​(<a href="https://docs.oracle.com/javase/8/docs/api/java/io/InputStream.html?is-external=true" title="class or interface in java.io" class="externalLink">InputStream</a> in, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/io/OutputStream.html?is-external=true" title="class or interface in java.io" class="externalLink">OutputStream</a> out, |
| byte[] encryptionKey)</code></th> |
| <td class="colLast"> |
| <div class="block">Receives the data from the given <code>InputStream</code>, encrypts it, and sends the resulting encrypted data to the |
| given <code>OutputStream</code>.</div> |
| </td> |
| </tr> |
| </table> |
| </li> |
| </ul> |
| </section> |
| </li> |
| </ul> |
| </div> |
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| </a> |
| <h3>Method Detail</h3> |
| <a id="decrypt(byte[],byte[])"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>decrypt</h4> |
| <pre class="methodSignature"><a href="../util/ByteSource.html" title="interface in org.apache.shiro.util">ByteSource</a> <a href="../../../../src-html/org/apache/shiro/crypto/CipherService.html#line.98">decrypt</a>​(byte[] encrypted, |
| byte[] decryptionKey) |
| throws <a href="CryptoException.html" title="class in org.apache.shiro.crypto">CryptoException</a></pre> |
| <div class="block">Decrypts encrypted data via the specified cipher key and returns the original (pre-encrypted) data. |
| Note that the key must be in a format understood by the CipherService implementation.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>encrypted</code> - the previously encrypted data to decrypt</dd> |
| <dd><code>decryptionKey</code> - the cipher key used during decryption.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>a byte source representing the original form of the specified encrypted data.</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="CryptoException.html" title="class in org.apache.shiro.crypto">CryptoException</a></code> - if there is an error during decryption</dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="decrypt(java.io.InputStream,java.io.OutputStream,byte[])"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
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| <h4>decrypt</h4> |
| <pre class="methodSignature">void <a href="../../../../src-html/org/apache/shiro/crypto/CipherService.html#line.130">decrypt</a>​(<a href="https://docs.oracle.com/javase/8/docs/api/java/io/InputStream.html?is-external=true" title="class or interface in java.io" class="externalLink">InputStream</a> in, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/io/OutputStream.html?is-external=true" title="class or interface in java.io" class="externalLink">OutputStream</a> out, |
| byte[] decryptionKey) |
| throws <a href="CryptoException.html" title="class in org.apache.shiro.crypto">CryptoException</a></pre> |
| <div class="block">Receives encrypted data from the given <code>InputStream</code>, decrypts it, and sends the resulting decrypted data |
| to the given <code>OutputStream</code>. |
| <p/> |
| <b>NOTE:</b> This method <em>does NOT</em> flush or close either stream prior to returning - the caller must |
| do so when they are finished with the streams. For example: |
| <pre> |
| try { |
| InputStream in = ... |
| OutputStream out = ... |
| cipherService.decrypt(in, out, decryptionKey); |
| } finally { |
| if (in != null) { |
| try { |
| in.close(); |
| } catch (IOException ioe1) { ... log, trigger event, etc } |
| } |
| if (out != null) { |
| try { |
| out.close(); |
| } catch (IOException ioe2) { ... log, trigger event, etc } |
| } |
| } |
| </pre></div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>in</code> - the stream supplying the data to decrypt</dd> |
| <dd><code>out</code> - the stream to send the decrypted data</dd> |
| <dd><code>decryptionKey</code> - the cipher key to use for decryption</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="CryptoException.html" title="class in org.apache.shiro.crypto">CryptoException</a></code> - if there is any problem during decryption.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="encrypt(byte[],byte[])"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>encrypt</h4> |
| <pre class="methodSignature"><a href="../util/ByteSource.html" title="interface in org.apache.shiro.util">ByteSource</a> <a href="../../../../src-html/org/apache/shiro/crypto/CipherService.html#line.141">encrypt</a>​(byte[] raw, |
| byte[] encryptionKey) |
| throws <a href="CryptoException.html" title="class in org.apache.shiro.crypto">CryptoException</a></pre> |
| <div class="block">Encrypts data via the specified cipher key. Note that the key must be in a format understood by |
| the <code>CipherService</code> implementation.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>raw</code> - the data to encrypt</dd> |
| <dd><code>encryptionKey</code> - the cipher key used during encryption.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>a byte source with the encrypted representation of the specified raw data.</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="CryptoException.html" title="class in org.apache.shiro.crypto">CryptoException</a></code> - if there is an error during encryption</dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="encrypt(java.io.InputStream,java.io.OutputStream,byte[])"> |
| <!-- --> |
| </a> |
| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>encrypt</h4> |
| <pre class="methodSignature">void <a href="../../../../src-html/org/apache/shiro/crypto/CipherService.html#line.173">encrypt</a>​(<a href="https://docs.oracle.com/javase/8/docs/api/java/io/InputStream.html?is-external=true" title="class or interface in java.io" class="externalLink">InputStream</a> in, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/io/OutputStream.html?is-external=true" title="class or interface in java.io" class="externalLink">OutputStream</a> out, |
| byte[] encryptionKey) |
| throws <a href="CryptoException.html" title="class in org.apache.shiro.crypto">CryptoException</a></pre> |
| <div class="block">Receives the data from the given <code>InputStream</code>, encrypts it, and sends the resulting encrypted data to the |
| given <code>OutputStream</code>. |
| <p/> |
| <b>NOTE:</b> This method <em>does NOT</em> flush or close either stream prior to returning - the caller must |
| do so when they are finished with the streams. For example: |
| <pre> |
| try { |
| InputStream in = ... |
| OutputStream out = ... |
| cipherService.encrypt(in, out, encryptionKey); |
| } finally { |
| if (in != null) { |
| try { |
| in.close(); |
| } catch (IOException ioe1) { ... log, trigger event, etc } |
| } |
| if (out != null) { |
| try { |
| out.close(); |
| } catch (IOException ioe2) { ... log, trigger event, etc } |
| } |
| } |
| </pre></div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>in</code> - the stream supplying the data to encrypt</dd> |
| <dd><code>out</code> - the stream to send the encrypted data</dd> |
| <dd><code>encryptionKey</code> - the cipher key to use for encryption</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="CryptoException.html" title="class in org.apache.shiro.crypto">CryptoException</a></code> - if there is any problem during encryption.</dd> |
| </dl> |
| </li> |
| </ul> |
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