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<div class="subTitle"><span class="packageLabelInType">Package</span>&nbsp;<a href="package-summary.html">org.apache.shiro.crypto</a></div>
<h2 title="Enum OperationMode" class="title">Enum OperationMode</h2>
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<pre>public enum <a href="../../../../src-html/org/apache/shiro/crypto/OperationMode.html#line.41">OperationMode</a>
extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Enum.html?is-external=true" title="class or interface in java.lang" class="externalLink">Enum</a>&lt;<a href="OperationMode.html" title="enum in org.apache.shiro.crypto">OperationMode</a>&gt;</pre>
<div class="block">A cipher <a href="http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation">mode of operation</a>
directs a cipher algorithm how to convert data during the encryption or decryption process. This enum represents
all JDK-standard Cipher operation mode names as defined in
<a href="http://java.sun.com/javase/6/docs/technotes/guides/security/StandardNames.html">JDK Security Standard
Names</a>, as well as a few more that are well-known and supported by other JCA Providers.
<p/>
This <code>enum</code> exists to provide Shiro end-users type-safety when declaring an operation mode. This helps reduce
error by providing a compile-time mechanism to specify a mode and guarantees a valid name that will be
recognized by an underlying JCA Provider.
<h2>Standard or Non-Standard?</h2>
All modes listed specify whether they are a JDK standard mode or a non-standard mode. Standard modes are included
in all JDK distributions. Non-standard modes can
sometimes result in better performance or more secure output, but may not be available on the target JDK
platform and rely on an external JCA Provider to be installed. Some providers
(like <a href="http://www.bouncycastle.org">Bouncy Castle</a>) may support these modes however.</div>
<dl>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>1.0</dd>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation">Block Cipher Modes of Operation<a/></dd>
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<th class="colFirst" scope="col">Enum Constant</th>
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<th class="colFirst" scope="row"><code><span class="memberNameLink"><a href="#CBC">CBC</a></span></code></th>
<td class="colLast">
<div class="block"><a href="http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Cipher-block_chaining_.28CBC.29">
Cipher-block Chaining</a> mode, defined in <a href="http://csrc.nist.gov/publications/fips/index.html">FIPS
PUB 81</a>.</div>
</td>
</tr>
<tr class="rowColor">
<th class="colFirst" scope="row"><code><span class="memberNameLink"><a href="#CCM">CCM</a></span></code></th>
<td class="colLast">
<div class="block"><a href="http://en.wikipedia.org/wiki/CCM_mode">Counter with CBC-MAC</a> mode<b>*</b> - for block ciphers with
128 bit block-size only.</div>
</td>
</tr>
<tr class="altColor">
<th class="colFirst" scope="row"><code><span class="memberNameLink"><a href="#CFB">CFB</a></span></code></th>
<td class="colLast">
<div class="block"><a href="http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Cipher_feedback_.28CFB.29">Cipher
Feedback<a/> mode, defined in <a href="http://csrc.nist.gov/publications/fips/index.html">FIPS PUB 81</a>.</div>
</td>
</tr>
<tr class="rowColor">
<th class="colFirst" scope="row"><code><span class="memberNameLink"><a href="#CTR">CTR</a></span></code></th>
<td class="colLast">
<div class="block"><a href="http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Counter_.28CTR.29">Counter Mode</a>, aka
Integer Counter Mode (ICM) and Segmented Integer Counter (SIC).</div>
</td>
</tr>
<tr class="altColor">
<th class="colFirst" scope="row"><code><span class="memberNameLink"><a href="#EAX">EAX</a></span></code></th>
<td class="colLast">
<div class="block"><a href="http://en.wikipedia.org/wiki/EAX_mode">EAX Mode</a><b>*</b>.</div>
</td>
</tr>
<tr class="rowColor">
<th class="colFirst" scope="row"><code><span class="memberNameLink"><a href="#ECB">ECB</a></span></code></th>
<td class="colLast">
<div class="block"><a href="http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Electronic_codebook_.28ECB.29">Electronic
Codebook</a> mode, defined in <a href="http://csrc.nist.gov/publications/fips/index.html">FIPS PUB 81</a>.</div>
</td>
</tr>
<tr class="altColor">
<th class="colFirst" scope="row"><code><span class="memberNameLink"><a href="#GCM">GCM</a></span></code></th>
<td class="colLast">
<div class="block"><a href="http://en.wikipedia.org/wiki/GCM_mode">Galois/Counter</a> mode<b>*</b> - for block ciphers with 128
bit block-size only.</div>
</td>
</tr>
<tr class="rowColor">
<th class="colFirst" scope="row"><code><span class="memberNameLink"><a href="#NONE">NONE</a></span></code></th>
<td class="colLast">
<div class="block">No mode.</div>
</td>
</tr>
<tr class="altColor">
<th class="colFirst" scope="row"><code><span class="memberNameLink"><a href="#OCB">OCB</a></span></code></th>
<td class="colLast">
<div class="block"><a href="http://en.wikipedia.org/wiki/OCB_mode">Offset Codebook</a> mode<b>*</b>.</div>
</td>
</tr>
<tr class="rowColor">
<th class="colFirst" scope="row"><code><span class="memberNameLink"><a href="#OFB">OFB</a></span></code></th>
<td class="colLast">
<div class="block"><a href="http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Output_feedback_.28OFB.29">Output
Feedback</a> mode, defined in <a href="http://csrc.nist.gov/publications/fips/index.html">FIPS PUB 81</a>.</div>
</td>
</tr>
<tr class="altColor">
<th class="colFirst" scope="row"><code><span class="memberNameLink"><a href="#PCBC">PCBC</a></span></code></th>
<td class="colLast">
<div class="block"><a href="http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Propagating_cipher-block_chaining_.28PCBC.29">
Propagating Cipher Block Chaining</a> mode, defined in <a href="http://web.mit.edu/kerberos/">Kerberos version 4<a/>.</div>
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<td class="colFirst"><code>static <a href="OperationMode.html" title="enum in org.apache.shiro.crypto">OperationMode</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#valueOf(java.lang.String)">valueOf</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;name)</code></th>
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<div class="block">Returns the enum constant of this type with the specified name.</div>
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<td class="colFirst"><code>static <a href="OperationMode.html" title="enum in org.apache.shiro.crypto">OperationMode</a>[]</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#values()">values</a></span>()</code></th>
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<pre>public static final&nbsp;<a href="OperationMode.html" title="enum in org.apache.shiro.crypto">OperationMode</a> <a href="../../../../src-html/org/apache/shiro/crypto/OperationMode.html#line.50">CBC</a></pre>
<div class="block"><a href="http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Cipher-block_chaining_.28CBC.29">
Cipher-block Chaining</a> mode, defined in <a href="http://csrc.nist.gov/publications/fips/index.html">FIPS
PUB 81</a>.
<p/>
This is a standard JDK operation mode and should be supported by all JDK environments.</div>
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<pre>public static final&nbsp;<a href="OperationMode.html" title="enum in org.apache.shiro.crypto">OperationMode</a> <a href="../../../../src-html/org/apache/shiro/crypto/OperationMode.html#line.61">CCM</a></pre>
<div class="block"><a href="http://en.wikipedia.org/wiki/CCM_mode">Counter with CBC-MAC</a> mode<b>*</b> - for block ciphers with
128 bit block-size only. See <a href="http://www.ietf.org/rfc/rfc3610.txt">RFC 3610</a> for AES Ciphers.
This mode has essentially been replaced by the more-capable <a href="#EAX"><code>EAX</code></a> mode.
<p/>
<b>*THIS IS A NON-STANDARD MODE</b>. It is not guaranteed to be supported across JDK installations. You must
ensure you have a JCA Provider that can support this cipher operation mode.
<a href="http://www.bouncycastle.org">Bouncy Castle</a> <em>may</em> be one such provider.</div>
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<pre>public static final&nbsp;<a href="OperationMode.html" title="enum in org.apache.shiro.crypto">OperationMode</a> <a href="../../../../src-html/org/apache/shiro/crypto/OperationMode.html#line.69">CFB</a></pre>
<div class="block"><a href="http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Cipher_feedback_.28CFB.29">Cipher
Feedback<a/> mode, defined in <a href="http://csrc.nist.gov/publications/fips/index.html">FIPS PUB 81</a>.
<p/>
This is a standard JDK operation mode and should be supported by all JDK environments.</div>
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<pre>public static final&nbsp;<a href="OperationMode.html" title="enum in org.apache.shiro.crypto">OperationMode</a> <a href="../../../../src-html/org/apache/shiro/crypto/OperationMode.html#line.78">CTR</a></pre>
<div class="block"><a href="http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Counter_.28CTR.29">Counter Mode</a>, aka
Integer Counter Mode (ICM) and Segmented Integer Counter (SIC). Counter is a simplification of <a href="#OFB"><code>OFB</code></a>
and updates the input block as a counter.
<p/>
This is a standard JDK operation mode and should be supported by all JDK environments.</div>
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<pre>public static final&nbsp;<a href="OperationMode.html" title="enum in org.apache.shiro.crypto">OperationMode</a> <a href="../../../../src-html/org/apache/shiro/crypto/OperationMode.html#line.88">EAX</a></pre>
<div class="block"><a href="http://en.wikipedia.org/wiki/EAX_mode">EAX Mode</a><b>*</b>. This is a patent-free but less-effecient
alternative to <a href="#OCB"><code>OCB</code></a> and has capabilities beyond what <a href="#CCM"><code>CCM</code></a> can provide.
<p/>
<b>*THIS IS A NON-STANDARD MODE</b>. It is not guaranteed to be supported across JDK installations. You must
ensure you have a JCA Provider that can support this cipher operation mode.
<a href="http://www.bouncycastle.org">Bouncy Castle</a> <em>may</em> be one such provider.</div>
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<pre>public static final&nbsp;<a href="OperationMode.html" title="enum in org.apache.shiro.crypto">OperationMode</a> <a href="../../../../src-html/org/apache/shiro/crypto/OperationMode.html#line.98">ECB</a></pre>
<div class="block"><a href="http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Electronic_codebook_.28ECB.29">Electronic
Codebook</a> mode, defined in <a href="http://csrc.nist.gov/publications/fips/index.html">FIPS PUB 81</a>.
ECB is the only mode that does <em>not</em> require an Initialization Vector, but because of this, can be seen
as less secure than operation modes that require an IV.
<p/>
This is a standard JDK operation mode and should be supported by all JDK environments.</div>
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<pre>public static final&nbsp;<a href="OperationMode.html" title="enum in org.apache.shiro.crypto">OperationMode</a> <a href="../../../../src-html/org/apache/shiro/crypto/OperationMode.html#line.108">GCM</a></pre>
<div class="block"><a href="http://en.wikipedia.org/wiki/GCM_mode">Galois/Counter</a> mode<b>*</b> - for block ciphers with 128
bit block-size only.
<p/>
<b>*THIS IS A NON-STANDARD MODE</b>. It is not guaranteed to be supported across JDK installations. You must
ensure you have a JCA Provider that can support this cipher operation mode.
<a href="http://www.bouncycastle.org">Bouncy Castle</a> <em>may</em> be one such provider.</div>
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<pre>public static final&nbsp;<a href="OperationMode.html" title="enum in org.apache.shiro.crypto">OperationMode</a> <a href="../../../../src-html/org/apache/shiro/crypto/OperationMode.html#line.115">NONE</a></pre>
<div class="block">No mode.
<p/>
This is a standard JDK operation mode and should be supported by all JDK environments.</div>
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<pre>public static final&nbsp;<a href="OperationMode.html" title="enum in org.apache.shiro.crypto">OperationMode</a> <a href="../../../../src-html/org/apache/shiro/crypto/OperationMode.html#line.126">OCB</a></pre>
<div class="block"><a href="http://en.wikipedia.org/wiki/OCB_mode">Offset Codebook</a> mode<b>*</b>. Parallel mode that provides
both message privacy and authenticity in a single pass. This is a very efficient mode, but is patent-encumbered.
A less-efficient (two pass) alternative is available by using <a href="#EAX"><code>EAX</code></a> mode.
<p/>
<b>*THIS IS A NON-STANDARD MODE</b>. It is not guaranteed to be supported across JDK installations. You must
ensure you have a JCA Provider that can support this cipher operation mode.
<a href="http://www.bouncycastle.org">Bouncy Castle</a> <em>may</em> be one such provider.</div>
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<pre>public static final&nbsp;<a href="OperationMode.html" title="enum in org.apache.shiro.crypto">OperationMode</a> <a href="../../../../src-html/org/apache/shiro/crypto/OperationMode.html#line.134">OFB</a></pre>
<div class="block"><a href="http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Output_feedback_.28OFB.29">Output
Feedback</a> mode, defined in <a href="http://csrc.nist.gov/publications/fips/index.html">FIPS PUB 81</a>.
<p/>
This is a standard JDK operation mode and should be supported by all JDK environments.</div>
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<pre>public static final&nbsp;<a href="OperationMode.html" title="enum in org.apache.shiro.crypto">OperationMode</a> <a href="../../../../src-html/org/apache/shiro/crypto/OperationMode.html#line.142">PCBC</a></pre>
<div class="block"><a href="http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Propagating_cipher-block_chaining_.28PCBC.29">
Propagating Cipher Block Chaining</a> mode, defined in <a href="http://web.mit.edu/kerberos/">Kerberos version 4<a/>.
<p/>
This is a standard JDK operation mode and should be supported by all JDK environments.</div>
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<pre class="methodSignature">public static&nbsp;<a href="OperationMode.html" title="enum in org.apache.shiro.crypto">OperationMode</a>[]&nbsp;<a href="../../../../src-html/org/apache/shiro/crypto/OperationMode.html#line.41">values</a>()</pre>
<div class="block">Returns an array containing the constants of this enum type, in
the order they are declared. This method may be used to iterate
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<pre>
for (OperationMode c : OperationMode.values())
&nbsp; System.out.println(c);
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<pre class="methodSignature">public static&nbsp;<a href="OperationMode.html" title="enum in org.apache.shiro.crypto">OperationMode</a>&nbsp;<a href="../../../../src-html/org/apache/shiro/crypto/OperationMode.html#line.41">valueOf</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;name)</pre>
<div class="block">Returns the enum constant of this type with the specified name.
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<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 this enum type has no constant with the specified name</dd>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/NullPointerException.html?is-external=true" title="class or interface in java.lang" class="externalLink">NullPointerException</a></code> - if the argument is null</dd>
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