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annotate src/org/eclipse/jetty/util/security/Credential.java @ 840:0f53601ea489

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author Franklin Schmidt <fschmidt@gmail.com>
date Mon, 19 Sep 2016 14:20:18 -0600
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1 //
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2 // ========================================================================
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3 // Copyright (c) 1995-2014 Mort Bay Consulting Pty. Ltd.
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4 // ------------------------------------------------------------------------
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5 // All rights reserved. This program and the accompanying materials
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6 // are made available under the terms of the Eclipse Public License v1.0
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7 // and Apache License v2.0 which accompanies this distribution.
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8 //
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9 // The Eclipse Public License is available at
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10 // http://www.eclipse.org/legal/epl-v10.html
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11 //
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12 // The Apache License v2.0 is available at
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13 // http://www.opensource.org/licenses/apache2.0.php
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14 //
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15 // You may elect to redistribute this code under either of these licenses.
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16 // ========================================================================
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17 //
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18
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19 package org.eclipse.jetty.util.security;
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20
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21 import java.io.Serializable;
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22 import java.security.MessageDigest;
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23
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24 import org.eclipse.jetty.util.StringUtil;
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25 import org.eclipse.jetty.util.TypeUtil;
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26 import org.slf4j.Logger;
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27 import org.slf4j.LoggerFactory;
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28
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29 /* ------------------------------------------------------------ */
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30 /**
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31 * Credentials. The Credential class represents an abstract mechanism for
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32 * checking authentication credentials. A credential instance either represents
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33 * a secret, or some data that could only be derived from knowing the secret.
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34 * <p>
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35 * Often a Credential is related to a Password via a one way algorithm, so while
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36 * a Password itself is a Credential, a UnixCrypt or MD5 digest of a a password
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37 * is only a credential that can be checked against the password.
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38 * <p>
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39 * This class includes an implementation for unix Crypt an MD5 digest.
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40 *
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41 * @see Password
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42 *
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43 */
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44 public abstract class Credential implements Serializable
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45 {
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46 private static final Logger LOG = LoggerFactory.getLogger(Credential.class);
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47
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48 private static final long serialVersionUID = -7760551052768181572L;
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49
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50 /* ------------------------------------------------------------ */
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51 /**
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52 * Check a credential
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53 *
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54 * @param credentials The credential to check against. This may either be
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55 * another Credential object, a Password object or a String
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56 * which is interpreted by this credential.
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57 * @return True if the credentials indicated that the shared secret is known
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58 * to both this Credential and the passed credential.
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59 */
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60 public abstract boolean check(Object credentials);
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61
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62 /* ------------------------------------------------------------ */
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63 /**
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64 * Get a credential from a String. If the credential String starts with a
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65 * known Credential type (eg "CRYPT:" or "MD5:" ) then a Credential of that
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66 * type is returned. Else the credential is assumed to be a Password.
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67 *
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68 * @param credential String representation of the credential
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69 * @return A Credential or Password instance.
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70 */
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71 public static Credential getCredential(String credential)
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72 {
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73 if (credential.startsWith(Crypt.__TYPE)) return new Crypt(credential);
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74 if (credential.startsWith(MD5.__TYPE)) return new MD5(credential);
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75
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76 return new Password(credential);
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77 }
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78
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79 /* ------------------------------------------------------------ */
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80 /**
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81 * Unix Crypt Credentials
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82 */
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83 public static class Crypt extends Credential
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84 {
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85 private static final long serialVersionUID = -2027792997664744210L;
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86
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87 public static final String __TYPE = "CRYPT:";
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88
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89 private final String _cooked;
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90
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91 Crypt(String cooked)
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92 {
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93 _cooked = cooked.startsWith(Crypt.__TYPE) ? cooked.substring(__TYPE.length()) : cooked;
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94 }
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95
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96 @Override
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97 public boolean check(Object credentials)
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98 {
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99 if (credentials instanceof char[])
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100 credentials=new String((char[])credentials);
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101 if (!(credentials instanceof String) && !(credentials instanceof Password))
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102 LOG.warn("Can't check " + credentials.getClass() + " against CRYPT");
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103
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104 String passwd = credentials.toString();
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105 return _cooked.equals(UnixCrypt.crypt(passwd, _cooked));
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106 }
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107
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108 public static String crypt(String user, String pw)
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109 {
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110 return "CRYPT:" + UnixCrypt.crypt(pw, user);
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111 }
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112 }
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113
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114 /* ------------------------------------------------------------ */
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115 /**
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116 * MD5 Credentials
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117 */
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118 public static class MD5 extends Credential
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119 {
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120 private static final long serialVersionUID = 5533846540822684240L;
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121
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122 public static final String __TYPE = "MD5:";
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123
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124 public static final Object __md5Lock = new Object();
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125
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126 private static MessageDigest __md;
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127
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128 private final byte[] _digest;
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129
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130 /* ------------------------------------------------------------ */
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131 MD5(String digest)
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132 {
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133 digest = digest.startsWith(__TYPE) ? digest.substring(__TYPE.length()) : digest;
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134 _digest = TypeUtil.parseBytes(digest, 16);
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135 }
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136
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137 /* ------------------------------------------------------------ */
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138 public byte[] getDigest()
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139 {
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140 return _digest;
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141 }
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142
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143 /* ------------------------------------------------------------ */
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144 @Override
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145 public boolean check(Object credentials)
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146 {
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147 try
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148 {
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149 byte[] digest = null;
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150
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151 if (credentials instanceof char[])
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152 credentials=new String((char[])credentials);
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153 if (credentials instanceof Password || credentials instanceof String)
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154 {
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155 synchronized (__md5Lock)
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156 {
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157 if (__md == null) __md = MessageDigest.getInstance("MD5");
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158 __md.reset();
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159 __md.update(credentials.toString().getBytes(StringUtil.__ISO_8859_1));
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160 digest = __md.digest();
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161 }
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162 if (digest == null || digest.length != _digest.length) return false;
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163 for (int i = 0; i < digest.length; i++)
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164 if (digest[i] != _digest[i]) return false;
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165 return true;
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166 }
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167 else if (credentials instanceof MD5)
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168 {
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169 MD5 md5 = (MD5) credentials;
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170 if (_digest.length != md5._digest.length) return false;
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171 for (int i = 0; i < _digest.length; i++)
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172 if (_digest[i] != md5._digest[i]) return false;
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173 return true;
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174 }
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175 else if (credentials instanceof Credential)
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176 {
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177 // Allow credential to attempt check - i.e. this'll work
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178 // for DigestAuthModule$Digest credentials
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179 return ((Credential) credentials).check(this);
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180 }
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181 else
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182 {
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183 LOG.warn("Can't check " + credentials.getClass() + " against MD5");
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184 return false;
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185 }
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186 }
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187 catch (Exception e)
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188 {
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189 LOG.warn("",e);
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190 return false;
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191 }
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192 }
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193
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194 /* ------------------------------------------------------------ */
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195 public static String digest(String password)
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196 {
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197 try
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198 {
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199 byte[] digest;
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200 synchronized (__md5Lock)
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201 {
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202 if (__md == null)
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203 {
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204 try
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205 {
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206 __md = MessageDigest.getInstance("MD5");
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207 }
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208 catch (Exception e)
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209 {
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210 LOG.warn("",e);
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211 return null;
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212 }
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213 }
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214
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215 __md.reset();
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216 __md.update(password.getBytes(StringUtil.__ISO_8859_1));
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217 digest = __md.digest();
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218 }
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219
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220 return __TYPE + TypeUtil.toString(digest, 16);
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221 }
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222 catch (Exception e)
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223 {
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224 LOG.warn("",e);
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225 return null;
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226 }
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227 }
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228 }
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229 }