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| <pre><span class="sourceLineNo">001</span>/*<a name="line.1"></a> |
| <span class="sourceLineNo">002</span> * Licensed to the Apache Software Foundation (ASF) under one<a name="line.2"></a> |
| <span class="sourceLineNo">003</span> * or more contributor license agreements. See the NOTICE file<a name="line.3"></a> |
| <span class="sourceLineNo">004</span> * distributed with this work for additional information<a name="line.4"></a> |
| <span class="sourceLineNo">005</span> * regarding copyright ownership. The ASF licenses this file<a name="line.5"></a> |
| <span class="sourceLineNo">006</span> * to you under the Apache License, Version 2.0 (the<a name="line.6"></a> |
| <span class="sourceLineNo">007</span> * "License"); you may not use this file except in compliance<a name="line.7"></a> |
| <span class="sourceLineNo">008</span> * with the License. You may obtain a copy of the License at<a name="line.8"></a> |
| <span class="sourceLineNo">009</span> *<a name="line.9"></a> |
| <span class="sourceLineNo">010</span> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.10"></a> |
| <span class="sourceLineNo">011</span> *<a name="line.11"></a> |
| <span class="sourceLineNo">012</span> * Unless required by applicable law or agreed to in writing,<a name="line.12"></a> |
| <span class="sourceLineNo">013</span> * software distributed under the License is distributed on an<a name="line.13"></a> |
| <span class="sourceLineNo">014</span> * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY<a name="line.14"></a> |
| <span class="sourceLineNo">015</span> * KIND, either express or implied. See the License for the<a name="line.15"></a> |
| <span class="sourceLineNo">016</span> * specific language governing permissions and limitations<a name="line.16"></a> |
| <span class="sourceLineNo">017</span> * under the License.<a name="line.17"></a> |
| <span class="sourceLineNo">018</span> */<a name="line.18"></a> |
| <span class="sourceLineNo">019</span>package org.apache.shiro.crypto;<a name="line.19"></a> |
| <span class="sourceLineNo">020</span><a name="line.20"></a> |
| <span class="sourceLineNo">021</span>/**<a name="line.21"></a> |
| <span class="sourceLineNo">022</span> * A {@code CipherPaddingScheme} represents well-known<a name="line.22"></a> |
| <span class="sourceLineNo">023</span> * <a href="http://en.wikipedia.org/wiki/Padding_(cryptography)">padding schemes</a> supported by JPA providers in a<a name="line.23"></a> |
| <span class="sourceLineNo">024</span> * type-safe manner.<a name="line.24"></a> |
| <span class="sourceLineNo">025</span> * <p/><a name="line.25"></a> |
| <span class="sourceLineNo">026</span> * When encrypted data is transferred, it is usually desirable to ensure that all 'chunks' transferred are a fixed-length:<a name="line.26"></a> |
| <span class="sourceLineNo">027</span> * different length blocks might give cryptanalysts clues about what the data might be, among other reasons. Of course<a name="line.27"></a> |
| <span class="sourceLineNo">028</span> * not all data will convert to neat fixed-length blocks, so padding schemes are used to 'fill in' (pad) any remaining<a name="line.28"></a> |
| <span class="sourceLineNo">029</span> * space with unintelligible data.<a name="line.29"></a> |
| <span class="sourceLineNo">030</span> * <p/><a name="line.30"></a> |
| <span class="sourceLineNo">031</span> * Padding schemes can be used in both asymmetric key ciphers as well as symmetric key ciphers (e.g. block ciphers).<a name="line.31"></a> |
| <span class="sourceLineNo">032</span> * Block-ciphers especially regularly use padding schemes as they are based on the notion of fixed-length block sizes.<a name="line.32"></a> |
| <span class="sourceLineNo">033</span> *<a name="line.33"></a> |
| <span class="sourceLineNo">034</span> * @see <a href="http://en.wikipedia.org/wiki/Padding_(cryptography)">Wikipedia: Cryptographic Padding</a><a name="line.34"></a> |
| <span class="sourceLineNo">035</span> * @since 1.0<a name="line.35"></a> |
| <span class="sourceLineNo">036</span> */<a name="line.36"></a> |
| <span class="sourceLineNo">037</span>public enum PaddingScheme {<a name="line.37"></a> |
| <span class="sourceLineNo">038</span><a name="line.38"></a> |
| <span class="sourceLineNo">039</span> /**<a name="line.39"></a> |
| <span class="sourceLineNo">040</span> * No padding. Useful when the block size is 8 bits for block cipher streaming operations. (Because<a name="line.40"></a> |
| <span class="sourceLineNo">041</span> * a byte is the most primitive block size, there is nothing to pad).<a name="line.41"></a> |
| <span class="sourceLineNo">042</span> */<a name="line.42"></a> |
| <span class="sourceLineNo">043</span> NONE("NoPadding"),<a name="line.43"></a> |
| <span class="sourceLineNo">044</span><a name="line.44"></a> |
| <span class="sourceLineNo">045</span> /**<a name="line.45"></a> |
| <span class="sourceLineNo">046</span> * Padding scheme as defined in the W3C's &quot;XML Encryption Syntax and Processing&quot; document,<a name="line.46"></a> |
| <span class="sourceLineNo">047</span> * <a href="http://www.w3.org/TR/xmlenc-core/#sec-Alg-Block">Section 5.2 - Block Encryption Algorithms</a>.<a name="line.47"></a> |
| <span class="sourceLineNo">048</span> */<a name="line.48"></a> |
| <span class="sourceLineNo">049</span> ISO10126("ISO10126Padding"),<a name="line.49"></a> |
| <span class="sourceLineNo">050</span><a name="line.50"></a> |
| <span class="sourceLineNo">051</span> /**<a name="line.51"></a> |
| <span class="sourceLineNo">052</span> * Optimal Asymmetric Encryption Padding defined in RSA's <a href="http://en.wikipedia.org/wiki/PKCS1">PKSC#1<a name="line.52"></a> |
| <span class="sourceLineNo">053</span> * standard</a> (aka <a href="http://tools.ietf.org/html/rfc3447">RFC 3447</a>).<a name="line.53"></a> |
| <span class="sourceLineNo">054</span> * <p/><a name="line.54"></a> |
| <span class="sourceLineNo">055</span> * <b>NOTE:</b> using this padding requires initializing {@link javax.crypto.Cipher Cipher} instances with a<a name="line.55"></a> |
| <span class="sourceLineNo">056</span> * {@link javax.crypto.spec.OAEPParameterSpec OAEPParameterSpec} object which provides the 1) message digest and<a name="line.56"></a> |
| <span class="sourceLineNo">057</span> * 2) mask generation function to use for the scheme.<a name="line.57"></a> |
| <span class="sourceLineNo">058</span> * <h3>Convenient Alternatives</h3><a name="line.58"></a> |
| <span class="sourceLineNo">059</span> * While using this scheme enables you full customization of the message digest + mask generation function<a name="line.59"></a> |
| <span class="sourceLineNo">060</span> * combination, it does require the extra burden of providing your own {@code OAEPParameterSpec} object. This is<a name="line.60"></a> |
| <span class="sourceLineNo">061</span> * often unnecessary, because most combinations are fairly standard. These common combinations are pre-defined<a name="line.61"></a> |
| <span class="sourceLineNo">062</span> * in this enum in the {@code OAEP}* variants.<a name="line.62"></a> |
| <span class="sourceLineNo">063</span> * <p/><a name="line.63"></a> |
| <span class="sourceLineNo">064</span> * If you find that these common combinations still do not meet your needs, then you will need to<a name="line.64"></a> |
| <span class="sourceLineNo">065</span> * specify your own message digest and mask generation function, either as an {@code OAEPParameterSpec} object<a name="line.65"></a> |
| <span class="sourceLineNo">066</span> * during Cipher initialization or, maybe more easily, in the scheme name directly. If you want to use scheme name<a name="line.66"></a> |
| <span class="sourceLineNo">067</span> * approach, the name format is specified in the<a name="line.67"></a> |
| <span class="sourceLineNo">068</span> * <a href="http://java.sun.com/javase/6/docs/technotes/guides/security/StandardNames.html">Standard Names</a><a name="line.68"></a> |
| <span class="sourceLineNo">069</span> * document in the <code>Cipher Algorithm Padding</code> section.<a name="line.69"></a> |
| <span class="sourceLineNo">070</span> *<a name="line.70"></a> |
| <span class="sourceLineNo">071</span> * @see #OAEPWithMd5AndMgf1<a name="line.71"></a> |
| <span class="sourceLineNo">072</span> * @see #OAEPWithSha1AndMgf1<a name="line.72"></a> |
| <span class="sourceLineNo">073</span> * @see #OAEPWithSha256AndMgf1<a name="line.73"></a> |
| <span class="sourceLineNo">074</span> * @see #OAEPWithSha384AndMgf1<a name="line.74"></a> |
| <span class="sourceLineNo">075</span> * @see #OAEPWithSha512AndMgf1<a name="line.75"></a> |
| <span class="sourceLineNo">076</span> */<a name="line.76"></a> |
| <span class="sourceLineNo">077</span> OAEP("OAEPPadding"),<a name="line.77"></a> |
| <span class="sourceLineNo">078</span><a name="line.78"></a> |
| <span class="sourceLineNo">079</span> /**<a name="line.79"></a> |
| <span class="sourceLineNo">080</span> * Optimal Asymmetric Encryption Padding with {@code MD5} message digest and {@code MGF1} mask generation function.<a name="line.80"></a> |
| <span class="sourceLineNo">081</span> * <p/><a name="line.81"></a> |
| <span class="sourceLineNo">082</span> * This is a convenient pre-defined OAEP padding scheme that embeds the message digest and mask generation function.<a name="line.82"></a> |
| <span class="sourceLineNo">083</span> * When using this padding scheme, there is no need to init the {@code Cipher} instance with an<a name="line.83"></a> |
| <span class="sourceLineNo">084</span> * {@link javax.crypto.spec.OAEPParameterSpec OAEPParameterSpec} object, as it is already 'built in' to the scheme<a name="line.84"></a> |
| <span class="sourceLineNo">085</span> * name (unlike the {@link #OAEP OAEP} scheme, which requires a bit more work).<a name="line.85"></a> |
| <span class="sourceLineNo">086</span> */<a name="line.86"></a> |
| <span class="sourceLineNo">087</span> OAEPWithMd5AndMgf1("OAEPWithMD5AndMGF1Padding"),<a name="line.87"></a> |
| <span class="sourceLineNo">088</span><a name="line.88"></a> |
| <span class="sourceLineNo">089</span> /**<a name="line.89"></a> |
| <span class="sourceLineNo">090</span> * Optimal Asymmetric Encryption Padding with {@code SHA-1} message digest and {@code MGF1} mask generation function.<a name="line.90"></a> |
| <span class="sourceLineNo">091</span> * <p/><a name="line.91"></a> |
| <span class="sourceLineNo">092</span> * This is a convenient pre-defined OAEP padding scheme that embeds the message digest and mask generation function.<a name="line.92"></a> |
| <span class="sourceLineNo">093</span> * When using this padding scheme, there is no need to init the {@code Cipher} instance with an<a name="line.93"></a> |
| <span class="sourceLineNo">094</span> * {@link javax.crypto.spec.OAEPParameterSpec OAEPParameterSpec} object, as it is already 'built in' to the scheme<a name="line.94"></a> |
| <span class="sourceLineNo">095</span> * name (unlike the {@link #OAEP OAEP} scheme, which requires a bit more work).<a name="line.95"></a> |
| <span class="sourceLineNo">096</span> */<a name="line.96"></a> |
| <span class="sourceLineNo">097</span> OAEPWithSha1AndMgf1("OAEPWithSHA-1AndMGF1Padding"),<a name="line.97"></a> |
| <span class="sourceLineNo">098</span><a name="line.98"></a> |
| <span class="sourceLineNo">099</span> /**<a name="line.99"></a> |
| <span class="sourceLineNo">100</span> * Optimal Asymmetric Encryption Padding with {@code SHA-256} message digest and {@code MGF1} mask generation function.<a name="line.100"></a> |
| <span class="sourceLineNo">101</span> * <p/><a name="line.101"></a> |
| <span class="sourceLineNo">102</span> * This is a convenient pre-defined OAEP padding scheme that embeds the message digest and mask generation function.<a name="line.102"></a> |
| <span class="sourceLineNo">103</span> * When using this padding scheme, there is no need to init the {@code Cipher} instance with an<a name="line.103"></a> |
| <span class="sourceLineNo">104</span> * {@link javax.crypto.spec.OAEPParameterSpec OAEPParameterSpec} object, as it is already 'built in' to the scheme<a name="line.104"></a> |
| <span class="sourceLineNo">105</span> * name (unlike the {@link #OAEP OAEP} scheme, which requires a bit more work).<a name="line.105"></a> |
| <span class="sourceLineNo">106</span> */<a name="line.106"></a> |
| <span class="sourceLineNo">107</span> OAEPWithSha256AndMgf1("OAEPWithSHA-256AndMGF1Padding"),<a name="line.107"></a> |
| <span class="sourceLineNo">108</span><a name="line.108"></a> |
| <span class="sourceLineNo">109</span> /**<a name="line.109"></a> |
| <span class="sourceLineNo">110</span> * Optimal Asymmetric Encryption Padding with {@code SHA-384} message digest and {@code MGF1} mask generation function.<a name="line.110"></a> |
| <span class="sourceLineNo">111</span> * <p/><a name="line.111"></a> |
| <span class="sourceLineNo">112</span> * This is a convenient pre-defined OAEP padding scheme that embeds the message digest and mask generation function.<a name="line.112"></a> |
| <span class="sourceLineNo">113</span> * When using this padding scheme, there is no need to init the {@code Cipher} instance with an<a name="line.113"></a> |
| <span class="sourceLineNo">114</span> * {@link javax.crypto.spec.OAEPParameterSpec OAEPParameterSpec} object, as it is already 'built in' to the scheme<a name="line.114"></a> |
| <span class="sourceLineNo">115</span> * name (unlike the {@link #OAEP OAEP} scheme, which requires a bit more work).<a name="line.115"></a> |
| <span class="sourceLineNo">116</span> */<a name="line.116"></a> |
| <span class="sourceLineNo">117</span> OAEPWithSha384AndMgf1("OAEPWithSHA-384AndMGF1Padding"),<a name="line.117"></a> |
| <span class="sourceLineNo">118</span><a name="line.118"></a> |
| <span class="sourceLineNo">119</span> /**<a name="line.119"></a> |
| <span class="sourceLineNo">120</span> * Optimal Asymmetric Encryption Padding with {@code SHA-512} message digest and {@code MGF1} mask generation function.<a name="line.120"></a> |
| <span class="sourceLineNo">121</span> * <p/><a name="line.121"></a> |
| <span class="sourceLineNo">122</span> * This is a convenient pre-defined OAEP padding scheme that embeds the message digest and mask generation function.<a name="line.122"></a> |
| <span class="sourceLineNo">123</span> * When using this padding scheme, there is no need to init the {@code Cipher} instance with an<a name="line.123"></a> |
| <span class="sourceLineNo">124</span> * {@link javax.crypto.spec.OAEPParameterSpec OAEPParameterSpec} object, as it is already 'built in' to the scheme<a name="line.124"></a> |
| <span class="sourceLineNo">125</span> * name (unlike the {@link #OAEP OAEP} scheme, which requires a bit more work).<a name="line.125"></a> |
| <span class="sourceLineNo">126</span> */<a name="line.126"></a> |
| <span class="sourceLineNo">127</span> OAEPWithSha512AndMgf1("OAEPWithSHA-512AndMGF1Padding"),<a name="line.127"></a> |
| <span class="sourceLineNo">128</span><a name="line.128"></a> |
| <span class="sourceLineNo">129</span> /**<a name="line.129"></a> |
| <span class="sourceLineNo">130</span> * Padding scheme used with the {@code RSA} algorithm defined in RSA's<a name="line.130"></a> |
| <span class="sourceLineNo">131</span> * <a href="http://en.wikipedia.org/wiki/PKCS1">PKSC#1 standard</a> (aka<a name="line.131"></a> |
| <span class="sourceLineNo">132</span> * <a href="http://tools.ietf.org/html/rfc3447">RFC 3447</a>).<a name="line.132"></a> |
| <span class="sourceLineNo">133</span> */<a name="line.133"></a> |
| <span class="sourceLineNo">134</span> PKCS1("PKCS1Padding"),<a name="line.134"></a> |
| <span class="sourceLineNo">135</span><a name="line.135"></a> |
| <span class="sourceLineNo">136</span> /**<a name="line.136"></a> |
| <span class="sourceLineNo">137</span> * Padding scheme defined in RSA's <a href="http://www.rsa.com/rsalabs/node.asp?id=2127">Password-Based<a name="line.137"></a> |
| <span class="sourceLineNo">138</span> * Cryptography Standard</a>.<a name="line.138"></a> |
| <span class="sourceLineNo">139</span> */<a name="line.139"></a> |
| <span class="sourceLineNo">140</span> PKCS5("PKCS5Padding"),<a name="line.140"></a> |
| <span class="sourceLineNo">141</span><a name="line.141"></a> |
| <span class="sourceLineNo">142</span> /**<a name="line.142"></a> |
| <span class="sourceLineNo">143</span> * Padding scheme defined in the <a href="http://www.mozilla.org/projects/security/pki/nss/ssl/draft302.txt">SSL<a name="line.143"></a> |
| <span class="sourceLineNo">144</span> * 3.0 specification</a>, section <code>5.2.3.2 (CBC block cipher)</code>.<a name="line.144"></a> |
| <span class="sourceLineNo">145</span> */<a name="line.145"></a> |
| <span class="sourceLineNo">146</span> SSL3("SSL3Padding");<a name="line.146"></a> |
| <span class="sourceLineNo">147</span><a name="line.147"></a> |
| <span class="sourceLineNo">148</span> private final String transformationName;<a name="line.148"></a> |
| <span class="sourceLineNo">149</span><a name="line.149"></a> |
| <span class="sourceLineNo">150</span> private PaddingScheme(String transformationName) {<a name="line.150"></a> |
| <span class="sourceLineNo">151</span> this.transformationName = transformationName;<a name="line.151"></a> |
| <span class="sourceLineNo">152</span> }<a name="line.152"></a> |
| <span class="sourceLineNo">153</span><a name="line.153"></a> |
| <span class="sourceLineNo">154</span> /**<a name="line.154"></a> |
| <span class="sourceLineNo">155</span> * Returns the actual string name to use when building the {@link javax.crypto.Cipher Cipher}<a name="line.155"></a> |
| <span class="sourceLineNo">156</span> * {@code transformation string}.<a name="line.156"></a> |
| <span class="sourceLineNo">157</span> *<a name="line.157"></a> |
| <span class="sourceLineNo">158</span> * @return the actual string name to use when building the {@link javax.crypto.Cipher Cipher}<a name="line.158"></a> |
| <span class="sourceLineNo">159</span> * {@code transformation string}.<a name="line.159"></a> |
| <span class="sourceLineNo">160</span> * @see javax.crypto.Cipher#getInstance(String)<a name="line.160"></a> |
| <span class="sourceLineNo">161</span> */<a name="line.161"></a> |
| <span class="sourceLineNo">162</span> public String getTransformationName() {<a name="line.162"></a> |
| <span class="sourceLineNo">163</span> return this.transformationName;<a name="line.163"></a> |
| <span class="sourceLineNo">164</span> }<a name="line.164"></a> |
| <span class="sourceLineNo">165</span>}<a name="line.165"></a> |
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