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<h2 title="Class JcaCipherService" class="title">Class JcaCipherService</h2>
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<dd><code><a href="CipherService.html" title="interface in org.apache.shiro.crypto">CipherService</a></code></dd>
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<dd><code><a href="AbstractSymmetricCipherService.html" title="class in org.apache.shiro.crypto">AbstractSymmetricCipherService</a></code></dd>
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<pre>public abstract class <a href="../../../../src-html/org/apache/shiro/crypto/JcaCipherService.html#line.69">JcaCipherService</a>
extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang" class="externalLink">Object</a>
implements <a href="CipherService.html" title="interface in org.apache.shiro.crypto">CipherService</a></pre>
<div class="block">Abstract <code>CipherService</code> implementation utilizing Java's JCA APIs.
<h2>Auto-generated Initialization Vectors</h2>
Shiro does something by default for all of its <code>CipherService</code> implementations that the JCA
<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> does not do: by default,
<a href="http://en.wikipedia.org/wiki/Initialization_vector">initialization vector</a>s are automatically randomly
generated and prepended to encrypted data before returning from the <code>encrypt</code> methods. That is, the returned
byte array or <code>OutputStream</code> is actually a concatenation of an initialization vector byte array plus the actual
encrypted data byte array. The <code>decrypt</code> methods in turn know to read this prepended initialization vector
before decrypting the real data that follows.
<p/>
This is highly desirable because initialization vectors guarantee that, for a key and any plaintext, the encrypted
output will always be different <em>even if you call <code>encrypt</code> multiple times with the exact same arguments</em>.
This is essential in cryptography to ensure that data patterns cannot be identified across multiple input sources
that are the same or similar.
<p/>
You can turn off this behavior by setting the
<a href="#setGenerateInitializationVectors(boolean)"><code>generateInitializationVectors</code></a> property to <code>false</code>, but it
is highly recommended that you do not do this unless you have a very good reason to do so, since you would be losing
a critical security feature.
<h3>Initialization Vector Size</h3>
This implementation defaults the <a href="#setInitializationVectorSize(int)"><code>initializationVectorSize</code></a> attribute to
<code>128</code> bits, a fairly common size. Initialization vector sizes are very algorithm specific however, so subclass
implementations will often override this value in their constructor if necessary.
<p/>
Also note that <code>initializationVectorSize</code> values are specified in the number of
bits (not bytes!) to match common references in most cryptography documentation. In practice though, initialization
vectors are always specified as a byte array, so ensure that if you set this property, that the value is a multiple
of <code>8</code> to ensure that the IV can be correctly represented as a byte array (the
<a href="#setInitializationVectorSize(int)"><code>setInitializationVectorSize</code></a> mutator method enforces this).</div>
<dl>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>1.0</dd>
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<th class="colFirst" scope="col">Modifier</th>
<th class="colSecond" scope="col">Constructor</th>
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<td class="colFirst"><code>protected </code></td>
<th class="colConstructorName" scope="row"><code><span class="memberNameLink"><a href="#%3Cinit%3E(java.lang.String)">JcaCipherService</a></span>&#8203;(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a>&nbsp;algorithmName)</code></th>
<td class="colLast">
<div class="block">Creates a new <code>JcaCipherService</code> instance which will use the specified cipher <code>algorithmName</code>
for all encryption, decryption, and key operations.</div>
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<caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd">&nbsp;</span></span><span id="t1" class="tableTab"><span><a href="javascript:show(1);">Static Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd">&nbsp;</span></span></caption>
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<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colSecond" scope="col">Method</th>
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<tr id="i0" class="altColor">
<td class="colFirst"><code>protected <a href="https://docs.oracle.com/javase/8/docs/api/java/security/spec/AlgorithmParameterSpec.html?is-external=true" title="class or interface in java.security.spec" class="externalLink">AlgorithmParameterSpec</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#createParameterSpec(byte%5B%5D,boolean)">createParameterSpec</a></span>&#8203;(byte[]&nbsp;iv,
boolean&nbsp;streaming)</code></th>
<td class="colLast">&nbsp;</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code>org.apache.shiro.util.ByteSource</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#decrypt(byte%5B%5D,byte%5B%5D)">decrypt</a></span>&#8203;(byte[]&nbsp;ciphertext,
byte[]&nbsp;key)</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="i2" class="altColor">
<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>&#8203;(<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>&nbsp;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>&nbsp;out,
byte[]&nbsp;key)</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="i3" class="rowColor">
<td class="colFirst"><code>org.apache.shiro.util.ByteSource</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#encrypt(byte%5B%5D,byte%5B%5D)">encrypt</a></span>&#8203;(byte[]&nbsp;plaintext,
byte[]&nbsp;key)</code></th>
<td class="colLast">
<div class="block">Encrypts data via the specified cipher key.</div>
</td>
</tr>
<tr id="i4" class="altColor">
<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>&#8203;(<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>&nbsp;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>&nbsp;out,
byte[]&nbsp;key)</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>
<tr id="i5" class="rowColor">
<td class="colFirst"><code>protected <a href="https://docs.oracle.com/javase/8/docs/api/java/security/SecureRandom.html?is-external=true" title="class or interface in java.security" class="externalLink">SecureRandom</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#ensureSecureRandom()">ensureSecureRandom</a></span>()</code></th>
<td class="colLast">&nbsp;</td>
</tr>
<tr id="i6" class="altColor">
<td class="colFirst"><code>protected byte[]</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#generateInitializationVector(boolean)">generateInitializationVector</a></span>&#8203;(boolean&nbsp;streaming)</code></th>
<td class="colLast">&nbsp;</td>
</tr>
<tr id="i7" class="rowColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getAlgorithmName()">getAlgorithmName</a></span>()</code></th>
<td class="colLast">
<div class="block">Returns the cipher algorithm name that will be used for all encryption, decryption, and key operations (for
example, 'AES', 'Blowfish', 'RSA', 'DSA', 'TripleDES', etc).</div>
</td>
</tr>
<tr id="i8" class="altColor">
<td class="colFirst"><code>protected static <a href="https://docs.oracle.com/javase/8/docs/api/java/security/SecureRandom.html?is-external=true" title="class or interface in java.security" class="externalLink">SecureRandom</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getDefaultSecureRandom()">getDefaultSecureRandom</a></span>()</code></th>
<td class="colLast">&nbsp;</td>
</tr>
<tr id="i9" class="rowColor">
<td class="colFirst"><code>int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getInitializationVectorSize()">getInitializationVectorSize</a></span>()</code></th>
<td class="colLast">
<div class="block">Returns the algorithm-specific size in bits of generated initialization vectors.</div>
</td>
</tr>
<tr id="i10" class="altColor">
<td class="colFirst"><code>int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getKeySize()">getKeySize</a></span>()</code></th>
<td class="colLast">
<div class="block">Returns the size in bits (not bytes) of generated cipher keys.</div>
</td>
</tr>
<tr id="i11" class="rowColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/security/SecureRandom.html?is-external=true" title="class or interface in java.security" class="externalLink">SecureRandom</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getSecureRandom()">getSecureRandom</a></span>()</code></th>
<td class="colLast">
<div class="block">Returns a source of randomness for encryption operations.</div>
</td>
</tr>
<tr id="i12" class="altColor">
<td class="colFirst"><code>int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getStreamingBufferSize()">getStreamingBufferSize</a></span>()</code></th>
<td class="colLast">
<div class="block">Returns the size in bytes of the internal buffer used to transfer data from one stream to another during stream
operations (<a href="#encrypt(java.io.InputStream,java.io.OutputStream,byte%5B%5D)"><code>encrypt(java.io.InputStream, java.io.OutputStream, byte[])</code></a> and
<a href="#decrypt(java.io.InputStream,java.io.OutputStream,byte%5B%5D)"><code>decrypt(java.io.InputStream, java.io.OutputStream, byte[])</code></a>).</div>
</td>
</tr>
<tr id="i13" class="rowColor">
<td class="colFirst"><code>protected <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getTransformationString(boolean)">getTransformationString</a></span>&#8203;(boolean&nbsp;streaming)</code></th>
<td class="colLast">
<div class="block">Returns the transformation string to use with the <a href="https://docs.oracle.com/javase/8/docs/api/javax/crypto/Cipher.html?is-external=true#getInstance(java.lang.String)" title="class or interface in javax.crypto" class="externalLink"><code>Cipher.getInstance(java.lang.String)</code></a> invocation when
creating a new <code>Cipher</code> instance.</div>
</td>
</tr>
<tr id="i14" class="altColor">
<td class="colFirst"><code>boolean</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#isGenerateInitializationVectors()">isGenerateInitializationVectors</a></span>()</code></th>
<td class="colLast">&nbsp;</td>
</tr>
<tr id="i15" class="rowColor">
<td class="colFirst"><code>protected boolean</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#isGenerateInitializationVectors(boolean)">isGenerateInitializationVectors</a></span>&#8203;(boolean&nbsp;streaming)</code></th>
<td class="colLast">&nbsp;</td>
</tr>
<tr id="i16" class="altColor">
<td class="colFirst"><code>void</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#setGenerateInitializationVectors(boolean)">setGenerateInitializationVectors</a></span>&#8203;(boolean&nbsp;generateInitializationVectors)</code></th>
<td class="colLast">&nbsp;</td>
</tr>
<tr id="i17" class="rowColor">
<td class="colFirst"><code>void</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#setInitializationVectorSize(int)">setInitializationVectorSize</a></span>&#8203;(int&nbsp;initializationVectorSize)</code></th>
<td class="colLast">
<div class="block">Sets the algorithm-specific initialization vector size in bits (not bytes!) to be used when generating
initialization vectors.</div>
</td>
</tr>
<tr id="i18" class="altColor">
<td class="colFirst"><code>void</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#setKeySize(int)">setKeySize</a></span>&#8203;(int&nbsp;keySize)</code></th>
<td class="colLast">
<div class="block">Sets the size in bits (not bytes) of generated cipher keys.</div>
</td>
</tr>
<tr id="i19" class="rowColor">
<td class="colFirst"><code>void</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#setSecureRandom(java.security.SecureRandom)">setSecureRandom</a></span>&#8203;(<a href="https://docs.oracle.com/javase/8/docs/api/java/security/SecureRandom.html?is-external=true" title="class or interface in java.security" class="externalLink">SecureRandom</a>&nbsp;secureRandom)</code></th>
<td class="colLast">
<div class="block">Sets a source of randomness for encryption operations.</div>
</td>
</tr>
<tr id="i20" class="altColor">
<td class="colFirst"><code>void</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#setStreamingBufferSize(int)">setStreamingBufferSize</a></span>&#8203;(int&nbsp;streamingBufferSize)</code></th>
<td class="colLast">
<div class="block">Sets the size in bytes of the internal buffer used to transfer data from one stream to another during stream
operations (<a href="#encrypt(java.io.InputStream,java.io.OutputStream,byte%5B%5D)"><code>encrypt(java.io.InputStream, java.io.OutputStream, byte[])</code></a> and
<a href="#decrypt(java.io.InputStream,java.io.OutputStream,byte%5B%5D)"><code>decrypt(java.io.InputStream, java.io.OutputStream, byte[])</code></a>).</div>
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<pre>protected&nbsp;<a href="../../../../src-html/org/apache/shiro/crypto/JcaCipherService.html#line.125">JcaCipherService</a>&#8203;(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a>&nbsp;algorithmName)</pre>
<div class="block">Creates a new <code>JcaCipherService</code> instance which will use the specified cipher <code>algorithmName</code>
for all encryption, decryption, and key operations. Also, the following defaults are set:
<ul>
<li><a href="#setKeySize(int)"><code>keySize</code></a> = 128 bits</li>
<li><a href="#setInitializationVectorSize(int)"><code>initializationVectorSize</code></a> = 128 bits</li>
<li><a href="#setStreamingBufferSize(int)"><code>streamingBufferSize</code></a> = 512 bytes</li>
</ul></div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>algorithmName</code> - the name of the cipher algorithm to use for all encryption, decryption, and key operations</dd>
</dl>
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<h4>getAlgorithmName</h4>
<pre class="methodSignature">public&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a>&nbsp;<a href="../../../../src-html/org/apache/shiro/crypto/JcaCipherService.html#line.142">getAlgorithmName</a>()</pre>
<div class="block">Returns the cipher algorithm name that will be used for all encryption, decryption, and key operations (for
example, 'AES', 'Blowfish', 'RSA', 'DSA', 'TripleDES', etc).</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the cipher algorithm name that will be used for all encryption, decryption, and key operations</dd>
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<pre class="methodSignature">public&nbsp;int&nbsp;<a href="../../../../src-html/org/apache/shiro/crypto/JcaCipherService.html#line.151">getKeySize</a>()</pre>
<div class="block">Returns the size in bits (not bytes) of generated cipher keys.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the size in bits (not bytes) of generated cipher keys.</dd>
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<pre class="methodSignature">public&nbsp;void&nbsp;<a href="../../../../src-html/org/apache/shiro/crypto/JcaCipherService.html#line.160">setKeySize</a>&#8203;(int&nbsp;keySize)</pre>
<div class="block">Sets the size in bits (not bytes) of generated cipher keys.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>keySize</code> - the size in bits (not bytes) of generated cipher keys.</dd>
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<pre class="methodSignature">public&nbsp;boolean&nbsp;<a href="../../../../src-html/org/apache/shiro/crypto/JcaCipherService.html#line.164">isGenerateInitializationVectors</a>()</pre>
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<pre class="methodSignature">public&nbsp;void&nbsp;<a href="../../../../src-html/org/apache/shiro/crypto/JcaCipherService.html#line.168">setGenerateInitializationVectors</a>&#8203;(boolean&nbsp;generateInitializationVectors)</pre>
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<pre class="methodSignature">public&nbsp;int&nbsp;<a href="../../../../src-html/org/apache/shiro/crypto/JcaCipherService.html#line.177">getInitializationVectorSize</a>()</pre>
<div class="block">Returns the algorithm-specific size in bits of generated initialization vectors.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the algorithm-specific size in bits of generated initialization vectors.</dd>
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<pre class="methodSignature">public&nbsp;void&nbsp;<a href="../../../../src-html/org/apache/shiro/crypto/JcaCipherService.html#line.189">setInitializationVectorSize</a>&#8203;(int&nbsp;initializationVectorSize)
throws <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/IllegalArgumentException.html?is-external=true" title="class or interface in java.lang" class="externalLink">IllegalArgumentException</a></pre>
<div class="block">Sets the algorithm-specific initialization vector size in bits (not bytes!) to be used when generating
initialization vectors. The value must be a multiple of <code>8</code> to ensure that the IV can be represented
as a byte array.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>initializationVectorSize</code> - the size in bits (not bytes) of generated initialization vectors.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/IllegalArgumentException.html?is-external=true" title="class or interface in java.lang" class="externalLink">IllegalArgumentException</a></code> - if the size is not a multiple of <code>8</code>.</dd>
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<pre class="methodSignature">protected&nbsp;boolean&nbsp;<a href="../../../../src-html/org/apache/shiro/crypto/JcaCipherService.html#line.198">isGenerateInitializationVectors</a>&#8203;(boolean&nbsp;streaming)</pre>
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<pre class="methodSignature">public&nbsp;int&nbsp;<a href="../../../../src-html/org/apache/shiro/crypto/JcaCipherService.html#line.212">getStreamingBufferSize</a>()</pre>
<div class="block">Returns the size in bytes of the internal buffer used to transfer data from one stream to another during stream
operations (<a href="#encrypt(java.io.InputStream,java.io.OutputStream,byte%5B%5D)"><code>encrypt(java.io.InputStream, java.io.OutputStream, byte[])</code></a> and
<a href="#decrypt(java.io.InputStream,java.io.OutputStream,byte%5B%5D)"><code>decrypt(java.io.InputStream, java.io.OutputStream, byte[])</code></a>).
<p/>
Default size is <code>512</code> bytes.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the size of the internal buffer used to transfer data from one stream to another during stream
operations</dd>
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<pre class="methodSignature">public&nbsp;void&nbsp;<a href="../../../../src-html/org/apache/shiro/crypto/JcaCipherService.html#line.226">setStreamingBufferSize</a>&#8203;(int&nbsp;streamingBufferSize)</pre>
<div class="block">Sets the size in bytes of the internal buffer used to transfer data from one stream to another during stream
operations (<a href="#encrypt(java.io.InputStream,java.io.OutputStream,byte%5B%5D)"><code>encrypt(java.io.InputStream, java.io.OutputStream, byte[])</code></a> and
<a href="#decrypt(java.io.InputStream,java.io.OutputStream,byte%5B%5D)"><code>decrypt(java.io.InputStream, java.io.OutputStream, byte[])</code></a>).
<p/>
Default size is <code>512</code> bytes.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>streamingBufferSize</code> - the size of the internal buffer used to transfer data from one stream to another
during stream operations</dd>
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<pre class="methodSignature">public&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/security/SecureRandom.html?is-external=true" title="class or interface in java.security" class="externalLink">SecureRandom</a>&nbsp;<a href="../../../../src-html/org/apache/shiro/crypto/JcaCipherService.html#line.237">getSecureRandom</a>()</pre>
<div class="block">Returns a source of randomness for encryption operations. If one is not configured, and the underlying
algorithm needs one, the JDK <code>SHA1PRNG</code> instance will be used by default.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>a source of randomness for encryption operations. If one is not configured, and the underlying
algorithm needs one, the JDK <code>SHA1PRNG</code> instance will be used by default.</dd>
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<pre class="methodSignature">public&nbsp;void&nbsp;<a href="../../../../src-html/org/apache/shiro/crypto/JcaCipherService.html#line.248">setSecureRandom</a>&#8203;(<a href="https://docs.oracle.com/javase/8/docs/api/java/security/SecureRandom.html?is-external=true" title="class or interface in java.security" class="externalLink">SecureRandom</a>&nbsp;secureRandom)</pre>
<div class="block">Sets a source of randomness for encryption operations. If one is not configured, and the underlying
algorithm needs one, the JDK <code>SHA1PRNG</code> instance will be used by default.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>secureRandom</code> - a source of randomness for encryption operations. If one is not configured, and the
underlying algorithm needs one, the JDK <code>SHA1PRNG</code> instance will be used by default.</dd>
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<pre class="methodSignature">protected static&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/security/SecureRandom.html?is-external=true" title="class or interface in java.security" class="externalLink">SecureRandom</a>&nbsp;<a href="../../../../src-html/org/apache/shiro/crypto/JcaCipherService.html#line.252">getDefaultSecureRandom</a>()</pre>
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<pre class="methodSignature">protected&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/security/SecureRandom.html?is-external=true" title="class or interface in java.security" class="externalLink">SecureRandom</a>&nbsp;<a href="../../../../src-html/org/apache/shiro/crypto/JcaCipherService.html#line.262">ensureSecureRandom</a>()</pre>
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<pre class="methodSignature">protected&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a>&nbsp;<a href="../../../../src-html/org/apache/shiro/crypto/JcaCipherService.html#line.280">getTransformationString</a>&#8203;(boolean&nbsp;streaming)</pre>
<div class="block">Returns the transformation string to use with the <a href="https://docs.oracle.com/javase/8/docs/api/javax/crypto/Cipher.html?is-external=true#getInstance(java.lang.String)" title="class or interface in javax.crypto" class="externalLink"><code>Cipher.getInstance(java.lang.String)</code></a> invocation when
creating a new <code>Cipher</code> instance. This default implementation always returns
<a href="#getAlgorithmName()"><code>getAlgorithmName()</code></a>. Block cipher implementations will want to override this method
to support appending cipher operation modes and padding schemes.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>streaming</code> - if the transformation string is going to be used for a Cipher for stream-based encryption or not.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the transformation string to use with the <a href="https://docs.oracle.com/javase/8/docs/api/javax/crypto/Cipher.html?is-external=true#getInstance(java.lang.String)" title="class or interface in javax.crypto" class="externalLink"><code>Cipher.getInstance(java.lang.String)</code></a> invocation when
creating a new <code>Cipher</code> instance.</dd>
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<pre class="methodSignature">protected&nbsp;byte[]&nbsp;<a href="../../../../src-html/org/apache/shiro/crypto/JcaCipherService.html#line.284">generateInitializationVector</a>&#8203;(boolean&nbsp;streaming)</pre>
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<pre class="methodSignature">public&nbsp;org.apache.shiro.util.ByteSource&nbsp;<a href="../../../../src-html/org/apache/shiro/crypto/JcaCipherService.html#line.303">encrypt</a>&#8203;(byte[]&nbsp;plaintext,
byte[]&nbsp;key)</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="CipherService.html#encrypt(byte%5B%5D,byte%5B%5D)">CipherService</a></code></span></div>
<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="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="CipherService.html#encrypt(byte%5B%5D,byte%5B%5D)">encrypt</a></code>&nbsp;in interface&nbsp;<code><a href="CipherService.html" title="interface in org.apache.shiro.crypto">CipherService</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>plaintext</code> - the data to encrypt</dd>
<dd><code>key</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>
</dl>
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<h4>decrypt</h4>
<pre class="methodSignature">public&nbsp;org.apache.shiro.util.ByteSource&nbsp;<a href="../../../../src-html/org/apache/shiro/crypto/JcaCipherService.html#line.347">decrypt</a>&#8203;(byte[]&nbsp;ciphertext,
byte[]&nbsp;key)
throws org.apache.shiro.crypto.CryptoException</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="CipherService.html#decrypt(byte%5B%5D,byte%5B%5D)">CipherService</a></code></span></div>
<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="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="CipherService.html#decrypt(byte%5B%5D,byte%5B%5D)">decrypt</a></code>&nbsp;in interface&nbsp;<code><a href="CipherService.html" title="interface in org.apache.shiro.crypto">CipherService</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>ciphertext</code> - the previously encrypted data to decrypt</dd>
<dd><code>key</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>org.apache.shiro.crypto.CryptoException</code> - if there is an error during decryption</dd>
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<a id="encrypt(java.io.InputStream,java.io.OutputStream,byte[])">
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<h4>encrypt</h4>
<pre class="methodSignature">public&nbsp;void&nbsp;<a href="../../../../src-html/org/apache/shiro/crypto/JcaCipherService.html#line.500">encrypt</a>&#8203;(<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>&nbsp;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>&nbsp;out,
byte[]&nbsp;key)
throws org.apache.shiro.crypto.CryptoException</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="CipherService.html#encrypt(java.io.InputStream,java.io.OutputStream,byte%5B%5D)">CipherService</a></code></span></div>
<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="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="CipherService.html#encrypt(java.io.InputStream,java.io.OutputStream,byte%5B%5D)">encrypt</a></code>&nbsp;in interface&nbsp;<code><a href="CipherService.html" title="interface in org.apache.shiro.crypto">CipherService</a></code></dd>
<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>key</code> - the cipher key to use for encryption</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code>org.apache.shiro.crypto.CryptoException</code> - if there is any problem during encryption.</dd>
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</ul>
<a id="decrypt(java.io.InputStream,java.io.OutputStream,byte[])">
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<h4>decrypt</h4>
<pre class="methodSignature">public&nbsp;void&nbsp;<a href="../../../../src-html/org/apache/shiro/crypto/JcaCipherService.html#line.526">decrypt</a>&#8203;(<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>&nbsp;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>&nbsp;out,
byte[]&nbsp;key)
throws org.apache.shiro.crypto.CryptoException</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="CipherService.html#decrypt(java.io.InputStream,java.io.OutputStream,byte%5B%5D)">CipherService</a></code></span></div>
<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="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="CipherService.html#decrypt(java.io.InputStream,java.io.OutputStream,byte%5B%5D)">decrypt</a></code>&nbsp;in interface&nbsp;<code><a href="CipherService.html" title="interface in org.apache.shiro.crypto">CipherService</a></code></dd>
<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>key</code> - the cipher key to use for decryption</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code>org.apache.shiro.crypto.CryptoException</code> - if there is any problem during decryption.</dd>
</dl>
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<h4>createParameterSpec</h4>
<pre class="methodSignature">protected&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/security/spec/AlgorithmParameterSpec.html?is-external=true" title="class or interface in java.security.spec" class="externalLink">AlgorithmParameterSpec</a>&nbsp;<a href="../../../../src-html/org/apache/shiro/crypto/JcaCipherService.html#line.604">createParameterSpec</a>&#8203;(byte[]&nbsp;iv,
boolean&nbsp;streaming)</pre>
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