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<div class="subTitle">org.apache.shiro.crypto</div>
<h2 title="Enum PaddingScheme" class="title">Enum PaddingScheme</h2>
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<li>org.apache.shiro.crypto.PaddingScheme</li>
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<pre>public enum <a href="../../../../src-html/org/apache/shiro/crypto/PaddingScheme.html#line.37">PaddingScheme</a>
extends <a href="http://java.sun.com/javase/6/docs/api/java/lang/Enum.html?is-external=true" title="class or interface in java.lang">Enum</a>&lt;<a href="../../../../org/apache/shiro/crypto/PaddingScheme.html" title="enum in org.apache.shiro.crypto">PaddingScheme</a>&gt;</pre>
<div class="block">A <code>CipherPaddingScheme</code> represents well-known
<a href="http://en.wikipedia.org/wiki/Padding_(cryptography)">padding schemes</a> supported by JPA providers in a
type-safe manner.
<p/>
When encrypted data is transferred, it is usually desirable to ensure that all 'chunks' transferred are a fixed-length:
different length blocks might give cryptanalysts clues about what the data might be, among other reasons. Of course
not all data will convert to neat fixed-length blocks, so padding schemes are used to 'fill in' (pad) any remaining
space with unintelligible data.
<p/>
Padding schemes can be used in both asymmetric key ciphers as well as symmetric key ciphers (e.g. block ciphers).
Block-ciphers especially regularly use padding schemes as they are based on the notion of fixed-length block sizes.</div>
<dl><dt><span class="strong">Since:</span></dt>
<dd>1.0</dd>
<dt><span class="strong">See Also:</span></dt><dd><a href="http://en.wikipedia.org/wiki/Padding_(cryptography)">Wikipedia: Cryptographic Padding</a></dd></dl>
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<th class="colOne" scope="col">Enum Constant and Description</th>
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<td class="colOne"><code><strong><a href="../../../../org/apache/shiro/crypto/PaddingScheme.html#ISO10126">ISO10126</a></strong></code>
<div class="block">Padding scheme as defined in the W3C's &quot;XML Encryption Syntax and Processing&quot; document,
<a href="http://www.w3.org/TR/xmlenc-core/#sec-Alg-Block">Section 5.2 - Block Encryption Algorithms</a>.</div>
</td>
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<tr class="rowColor">
<td class="colOne"><code><strong><a href="../../../../org/apache/shiro/crypto/PaddingScheme.html#NONE">NONE</a></strong></code>
<div class="block">No padding.</div>
</td>
</tr>
<tr class="altColor">
<td class="colOne"><code><strong><a href="../../../../org/apache/shiro/crypto/PaddingScheme.html#OAEP">OAEP</a></strong></code>
<div class="block">Optimal Asymmetric Encryption Padding defined in RSA's <a href="http://en.wikipedia.org/wiki/PKCS1">PKSC#1
standard</a> (aka <a href="http://tools.ietf.org/html/rfc3447">RFC 3447</a>).</div>
</td>
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<td class="colOne"><code><strong><a href="../../../../org/apache/shiro/crypto/PaddingScheme.html#OAEPWithMd5AndMgf1">OAEPWithMd5AndMgf1</a></strong></code>
<div class="block">Optimal Asymmetric Encryption Padding with <code>MD5</code> message digest and <code>MGF1</code> mask generation function.</div>
</td>
</tr>
<tr class="altColor">
<td class="colOne"><code><strong><a href="../../../../org/apache/shiro/crypto/PaddingScheme.html#OAEPWithSha1AndMgf1">OAEPWithSha1AndMgf1</a></strong></code>
<div class="block">Optimal Asymmetric Encryption Padding with <code>SHA-1</code> message digest and <code>MGF1</code> mask generation function.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colOne"><code><strong><a href="../../../../org/apache/shiro/crypto/PaddingScheme.html#OAEPWithSha256AndMgf1">OAEPWithSha256AndMgf1</a></strong></code>
<div class="block">Optimal Asymmetric Encryption Padding with <code>SHA-256</code> message digest and <code>MGF1</code> mask generation function.</div>
</td>
</tr>
<tr class="altColor">
<td class="colOne"><code><strong><a href="../../../../org/apache/shiro/crypto/PaddingScheme.html#OAEPWithSha384AndMgf1">OAEPWithSha384AndMgf1</a></strong></code>
<div class="block">Optimal Asymmetric Encryption Padding with <code>SHA-384</code> message digest and <code>MGF1</code> mask generation function.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colOne"><code><strong><a href="../../../../org/apache/shiro/crypto/PaddingScheme.html#OAEPWithSha512AndMgf1">OAEPWithSha512AndMgf1</a></strong></code>
<div class="block">Optimal Asymmetric Encryption Padding with <code>SHA-512</code> message digest and <code>MGF1</code> mask generation function.</div>
</td>
</tr>
<tr class="altColor">
<td class="colOne"><code><strong><a href="../../../../org/apache/shiro/crypto/PaddingScheme.html#PKCS1">PKCS1</a></strong></code>
<div class="block">Padding scheme used with the <code>RSA</code> algorithm defined in RSA's
<a href="http://en.wikipedia.org/wiki/PKCS1">PKSC#1 standard</a> (aka
<a href="http://tools.ietf.org/html/rfc3447">RFC 3447</a>).</div>
</td>
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<tr class="rowColor">
<td class="colOne"><code><strong><a href="../../../../org/apache/shiro/crypto/PaddingScheme.html#PKCS5">PKCS5</a></strong></code>
<div class="block">Padding scheme defined in RSA's <a href="http://www.rsa.com/rsalabs/node.asp?id=2127">Password-Based
Cryptography Standard</a>.</div>
</td>
</tr>
<tr class="altColor">
<td class="colOne"><code><strong><a href="../../../../org/apache/shiro/crypto/PaddingScheme.html#SSL3">SSL3</a></strong></code>
<div class="block">Padding scheme defined in the <a href="http://www.mozilla.org/projects/security/pki/nss/ssl/draft302.txt">SSL
3.0 specification</a>, section <code>5.2.3.2 (CBC block cipher)</code>.</div>
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<td class="colFirst"><code><a href="http://java.sun.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/shiro/crypto/PaddingScheme.html#getTransformationName()">getTransformationName</a></strong>()</code>
<div class="block">Returns the actual string name to use when building the <a href="http://java.sun.com/javase/6/docs/api/javax/crypto/Cipher.html?is-external=true" title="class or interface in javax.crypto"><code>Cipher</code></a>
<code>transformation string</code>.</div>
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<td class="colFirst"><code>static <a href="../../../../org/apache/shiro/crypto/PaddingScheme.html" title="enum in org.apache.shiro.crypto">PaddingScheme</a></code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/shiro/crypto/PaddingScheme.html#valueOf(java.lang.String)">valueOf</a></strong>(<a href="http://java.sun.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;name)</code>
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<td class="colFirst"><code>static <a href="../../../../org/apache/shiro/crypto/PaddingScheme.html" title="enum in org.apache.shiro.crypto">PaddingScheme</a>[]</code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/shiro/crypto/PaddingScheme.html#values()">values</a></strong>()</code>
<div class="block">Returns an array containing the constants of this enum type, in
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<pre>public static final&nbsp;<a href="../../../../org/apache/shiro/crypto/PaddingScheme.html" title="enum in org.apache.shiro.crypto">PaddingScheme</a> <a href="../../../../src-html/org/apache/shiro/crypto/PaddingScheme.html#line.43">NONE</a></pre>
<div class="block">No padding. Useful when the block size is 8 bits for block cipher streaming operations. (Because
a byte is the most primitive block size, there is nothing to pad).</div>
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<pre>public static final&nbsp;<a href="../../../../org/apache/shiro/crypto/PaddingScheme.html" title="enum in org.apache.shiro.crypto">PaddingScheme</a> <a href="../../../../src-html/org/apache/shiro/crypto/PaddingScheme.html#line.49">ISO10126</a></pre>
<div class="block">Padding scheme as defined in the W3C's &quot;XML Encryption Syntax and Processing&quot; document,
<a href="http://www.w3.org/TR/xmlenc-core/#sec-Alg-Block">Section 5.2 - Block Encryption Algorithms</a>.</div>
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<pre>public static final&nbsp;<a href="../../../../org/apache/shiro/crypto/PaddingScheme.html" title="enum in org.apache.shiro.crypto">PaddingScheme</a> <a href="../../../../src-html/org/apache/shiro/crypto/PaddingScheme.html#line.77">OAEP</a></pre>
<div class="block">Optimal Asymmetric Encryption Padding defined in RSA's <a href="http://en.wikipedia.org/wiki/PKCS1">PKSC#1
standard</a> (aka <a href="http://tools.ietf.org/html/rfc3447">RFC 3447</a>).
<p/>
<b>NOTE:</b> using this padding requires initializing <a href="http://java.sun.com/javase/6/docs/api/javax/crypto/Cipher.html?is-external=true" title="class or interface in javax.crypto"><code>Cipher</code></a> instances with a
<a href="http://java.sun.com/javase/6/docs/api/javax/crypto/spec/OAEPParameterSpec.html?is-external=true" title="class or interface in javax.crypto.spec"><code>OAEPParameterSpec</code></a> object which provides the 1) message digest and
2) mask generation function to use for the scheme.
<h3>Convenient Alternatives</h3>
While using this scheme enables you full customization of the message digest + mask generation function
combination, it does require the extra burden of providing your own <code>OAEPParameterSpec</code> object. This is
often unnecessary, because most combinations are fairly standard. These common combinations are pre-defined
in this enum in the <code>OAEP</code>* variants.
<p/>
If you find that these common combinations still do not meet your needs, then you will need to
specify your own message digest and mask generation function, either as an <code>OAEPParameterSpec</code> object
during Cipher initialization or, maybe more easily, in the scheme name directly. If you want to use scheme name
approach, the name format is specified in the
<a href="http://java.sun.com/javase/6/docs/technotes/guides/security/StandardNames.html">Standard Names</a>
document in the <code>Cipher Algorithm Padding</code> section.</div>
<dl><dt><span class="strong">See Also:</span></dt><dd><a href="../../../../org/apache/shiro/crypto/PaddingScheme.html#OAEPWithMd5AndMgf1"><code>OAEPWithMd5AndMgf1</code></a>,
<a href="../../../../org/apache/shiro/crypto/PaddingScheme.html#OAEPWithSha1AndMgf1"><code>OAEPWithSha1AndMgf1</code></a>,
<a href="../../../../org/apache/shiro/crypto/PaddingScheme.html#OAEPWithSha256AndMgf1"><code>OAEPWithSha256AndMgf1</code></a>,
<a href="../../../../org/apache/shiro/crypto/PaddingScheme.html#OAEPWithSha384AndMgf1"><code>OAEPWithSha384AndMgf1</code></a>,
<a href="../../../../org/apache/shiro/crypto/PaddingScheme.html#OAEPWithSha512AndMgf1"><code>OAEPWithSha512AndMgf1</code></a></dd></dl>
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<pre>public static final&nbsp;<a href="../../../../org/apache/shiro/crypto/PaddingScheme.html" title="enum in org.apache.shiro.crypto">PaddingScheme</a> <a href="../../../../src-html/org/apache/shiro/crypto/PaddingScheme.html#line.87">OAEPWithMd5AndMgf1</a></pre>
<div class="block">Optimal Asymmetric Encryption Padding with <code>MD5</code> message digest and <code>MGF1</code> mask generation function.
<p/>
This is a convenient pre-defined OAEP padding scheme that embeds the message digest and mask generation function.
When using this padding scheme, there is no need to init the <code>Cipher</code> instance with an
<a href="http://java.sun.com/javase/6/docs/api/javax/crypto/spec/OAEPParameterSpec.html?is-external=true" title="class or interface in javax.crypto.spec"><code>OAEPParameterSpec</code></a> object, as it is already 'built in' to the scheme
name (unlike the <a href="../../../../org/apache/shiro/crypto/PaddingScheme.html#OAEP"><code>OAEP</code></a> scheme, which requires a bit more work).</div>
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<pre>public static final&nbsp;<a href="../../../../org/apache/shiro/crypto/PaddingScheme.html" title="enum in org.apache.shiro.crypto">PaddingScheme</a> <a href="../../../../src-html/org/apache/shiro/crypto/PaddingScheme.html#line.97">OAEPWithSha1AndMgf1</a></pre>
<div class="block">Optimal Asymmetric Encryption Padding with <code>SHA-1</code> message digest and <code>MGF1</code> mask generation function.
<p/>
This is a convenient pre-defined OAEP padding scheme that embeds the message digest and mask generation function.
When using this padding scheme, there is no need to init the <code>Cipher</code> instance with an
<a href="http://java.sun.com/javase/6/docs/api/javax/crypto/spec/OAEPParameterSpec.html?is-external=true" title="class or interface in javax.crypto.spec"><code>OAEPParameterSpec</code></a> object, as it is already 'built in' to the scheme
name (unlike the <a href="../../../../org/apache/shiro/crypto/PaddingScheme.html#OAEP"><code>OAEP</code></a> scheme, which requires a bit more work).</div>
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<pre>public static final&nbsp;<a href="../../../../org/apache/shiro/crypto/PaddingScheme.html" title="enum in org.apache.shiro.crypto">PaddingScheme</a> <a href="../../../../src-html/org/apache/shiro/crypto/PaddingScheme.html#line.107">OAEPWithSha256AndMgf1</a></pre>
<div class="block">Optimal Asymmetric Encryption Padding with <code>SHA-256</code> message digest and <code>MGF1</code> mask generation function.
<p/>
This is a convenient pre-defined OAEP padding scheme that embeds the message digest and mask generation function.
When using this padding scheme, there is no need to init the <code>Cipher</code> instance with an
<a href="http://java.sun.com/javase/6/docs/api/javax/crypto/spec/OAEPParameterSpec.html?is-external=true" title="class or interface in javax.crypto.spec"><code>OAEPParameterSpec</code></a> object, as it is already 'built in' to the scheme
name (unlike the <a href="../../../../org/apache/shiro/crypto/PaddingScheme.html#OAEP"><code>OAEP</code></a> scheme, which requires a bit more work).</div>
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<pre>public static final&nbsp;<a href="../../../../org/apache/shiro/crypto/PaddingScheme.html" title="enum in org.apache.shiro.crypto">PaddingScheme</a> <a href="../../../../src-html/org/apache/shiro/crypto/PaddingScheme.html#line.117">OAEPWithSha384AndMgf1</a></pre>
<div class="block">Optimal Asymmetric Encryption Padding with <code>SHA-384</code> message digest and <code>MGF1</code> mask generation function.
<p/>
This is a convenient pre-defined OAEP padding scheme that embeds the message digest and mask generation function.
When using this padding scheme, there is no need to init the <code>Cipher</code> instance with an
<a href="http://java.sun.com/javase/6/docs/api/javax/crypto/spec/OAEPParameterSpec.html?is-external=true" title="class or interface in javax.crypto.spec"><code>OAEPParameterSpec</code></a> object, as it is already 'built in' to the scheme
name (unlike the <a href="../../../../org/apache/shiro/crypto/PaddingScheme.html#OAEP"><code>OAEP</code></a> scheme, which requires a bit more work).</div>
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<h4>OAEPWithSha512AndMgf1</h4>
<pre>public static final&nbsp;<a href="../../../../org/apache/shiro/crypto/PaddingScheme.html" title="enum in org.apache.shiro.crypto">PaddingScheme</a> <a href="../../../../src-html/org/apache/shiro/crypto/PaddingScheme.html#line.127">OAEPWithSha512AndMgf1</a></pre>
<div class="block">Optimal Asymmetric Encryption Padding with <code>SHA-512</code> message digest and <code>MGF1</code> mask generation function.
<p/>
This is a convenient pre-defined OAEP padding scheme that embeds the message digest and mask generation function.
When using this padding scheme, there is no need to init the <code>Cipher</code> instance with an
<a href="http://java.sun.com/javase/6/docs/api/javax/crypto/spec/OAEPParameterSpec.html?is-external=true" title="class or interface in javax.crypto.spec"><code>OAEPParameterSpec</code></a> object, as it is already 'built in' to the scheme
name (unlike the <a href="../../../../org/apache/shiro/crypto/PaddingScheme.html#OAEP"><code>OAEP</code></a> scheme, which requires a bit more work).</div>
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<h4>PKCS1</h4>
<pre>public static final&nbsp;<a href="../../../../org/apache/shiro/crypto/PaddingScheme.html" title="enum in org.apache.shiro.crypto">PaddingScheme</a> <a href="../../../../src-html/org/apache/shiro/crypto/PaddingScheme.html#line.134">PKCS1</a></pre>
<div class="block">Padding scheme used with the <code>RSA</code> algorithm defined in RSA's
<a href="http://en.wikipedia.org/wiki/PKCS1">PKSC#1 standard</a> (aka
<a href="http://tools.ietf.org/html/rfc3447">RFC 3447</a>).</div>
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<h4>PKCS5</h4>
<pre>public static final&nbsp;<a href="../../../../org/apache/shiro/crypto/PaddingScheme.html" title="enum in org.apache.shiro.crypto">PaddingScheme</a> <a href="../../../../src-html/org/apache/shiro/crypto/PaddingScheme.html#line.140">PKCS5</a></pre>
<div class="block">Padding scheme defined in RSA's <a href="http://www.rsa.com/rsalabs/node.asp?id=2127">Password-Based
Cryptography Standard</a>.</div>
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<h4>SSL3</h4>
<pre>public static final&nbsp;<a href="../../../../org/apache/shiro/crypto/PaddingScheme.html" title="enum in org.apache.shiro.crypto">PaddingScheme</a> <a href="../../../../src-html/org/apache/shiro/crypto/PaddingScheme.html#line.146">SSL3</a></pre>
<div class="block">Padding scheme defined in the <a href="http://www.mozilla.org/projects/security/pki/nss/ssl/draft302.txt">SSL
3.0 specification</a>, section <code>5.2.3.2 (CBC block cipher)</code>.</div>
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<pre>public static&nbsp;<a href="../../../../org/apache/shiro/crypto/PaddingScheme.html" title="enum in org.apache.shiro.crypto">PaddingScheme</a>[]&nbsp;<a href="../../../../src-html/org/apache/shiro/crypto/PaddingScheme.html#line.37">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
over the constants as follows:
<pre>
for (PaddingScheme c : PaddingScheme.values())
&nbsp; System.out.println(c);
</pre></div>
<dl><dt><span class="strong">Returns:</span></dt><dd>an array containing the constants of this enum type, in
the order they are declared</dd></dl>
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<pre>public static&nbsp;<a href="../../../../org/apache/shiro/crypto/PaddingScheme.html" title="enum in org.apache.shiro.crypto">PaddingScheme</a>&nbsp;<a href="../../../../src-html/org/apache/shiro/crypto/PaddingScheme.html#line.37">valueOf</a>(<a href="http://java.sun.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;name)</pre>
<div class="block">Returns the enum constant of this type with the specified name.
The string must match <i>exactly</i> an identifier used to declare an
enum constant in this type. (Extraneous whitespace characters are
not permitted.)</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>name</code> - the name of the enum constant to be returned.</dd>
<dt><span class="strong">Returns:</span></dt><dd>the enum constant with the specified name</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="http://java.sun.com/javase/6/docs/api/java/lang/IllegalArgumentException.html?is-external=true" title="class or interface in java.lang">IllegalArgumentException</a></code> - if this enum type has no constant
with the specified name</dd>
<dd><code><a href="http://java.sun.com/javase/6/docs/api/java/lang/NullPointerException.html?is-external=true" title="class or interface in java.lang">NullPointerException</a></code> - if the argument is null</dd></dl>
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<pre>public&nbsp;<a href="http://java.sun.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;<a href="../../../../src-html/org/apache/shiro/crypto/PaddingScheme.html#line.162">getTransformationName</a>()</pre>
<div class="block">Returns the actual string name to use when building the <a href="http://java.sun.com/javase/6/docs/api/javax/crypto/Cipher.html?is-external=true" title="class or interface in javax.crypto"><code>Cipher</code></a>
<code>transformation string</code>.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>the actual string name to use when building the <a href="http://java.sun.com/javase/6/docs/api/javax/crypto/Cipher.html?is-external=true" title="class or interface in javax.crypto"><code>Cipher</code></a>
<code>transformation string</code>.</dd><dt><span class="strong">See Also:</span></dt><dd><a href="http://java.sun.com/javase/6/docs/api/javax/crypto/Cipher.html?is-external=true#getInstance(java.lang.String)" title="class or interface in javax.crypto"><code>Cipher.getInstance(String)</code></a></dd></dl>
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