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In various systems, we will inevitably use the encryption. Encrypted into the ciphertext can be restored and not restored the two ciphertext, the ciphertext can be used to restore more common,air force one 25th, more and more that DES algorithm, and can not be restored is the MD5 of the more. This article provides two methods to achieve the corresponding java. Some function reference networks
1package com.resoft.util;
2
3import java.io.UnsupportedEncodingException;
4import java.security.InvalidKeyException;
5import java.security.MessageDigest;
6import java.security.NoSuchAlgorithmException;
7import java.security.SecureRandom;
8import java.security.spec.InvalidKeySpecException;
9
10import javax.crypto.BadPaddingException;
11import javax.crypto.Cipher;
12import javax.crypto. IllegalBlockSizeException;
13import javax.crypto.NoSuchPaddingException;
14import javax.crypto.SecretKey;
15import javax.crypto.SecretKeyFactory;
16import javax.crypto.spec.DESKeySpec;
17
18import sun.misc.BASE64Encoder;
19
20 / ** *//**
21 * security encryption type
22 *
23 * @ date 2007-10-31
24 * @ author yayagepei
25 *
26 * /
27public class SecurityEncode {
28
29 / ** *//**
30 * MD5 encrypt a string
31 *
32 * @ param str
33 ; * To encrypt a string
34 * @ return encrypted string
35 * @ throws NoSuchAlgorithmException
36 * @ throws UnsupportedEncodingException
37 * @ author yayagepei
38 * @ date 2007-10-31
39 * @ comment on the Value reflected in two aspects: its current value,cheap air force ones, its future value
40 * /
41 public static String encoderByMd5 (String str)
42 ; throws NoSuchAlgorithmException, UnsupportedEncodingException {
43 / / determine the method
44 ; MessageDigest md5 = MessageDigest.getInstance (\/ / encrypted string
47 String newstr = base64en.encode (md5.digest (str.getBytes (\br> 50
51 / ** *//**
52 * DES encryption and decryption
53 *
54 * @ param plainText
55 * to deal with the byte []
56 * @ param key
57 * ; key
58 * @ param mode
59 * mode
60 * @ return
61 * @ throws InvalidKeyException
62 ; * @ throws InvalidKeySpecException
63 * @ throws NoSuchAlgorithmException
64 * @ throws NoSuchPaddingException
65 * @ throws BadPaddingException
66 * @ throws IllegalBlockSizeException
67 * @ throws UnsupportedEncodingException
68 * @ author yayagepei
69 * @ date 2008-10-8
70 * /
71 private static byte [] coderByDES (byte [] plainText, String key, int mode)
72 throws InvalidKeyException, InvalidKeySpecException,nike air force one,
73 ; NoSuchAlgorithmException, NoSuchPaddingException,
74 BadPaddingException, IllegalBlockSizeException,
75 UnsupportedEncodingException {
76 SecureRandom sr = new SecureRandom ();
77 byte [] resultKey = makeKey (key);
78 DESKeySpec desSpec = new DESKeySpec (resultKey);
79 SecretKey secretKey = SecretKeyFactory.getInstance (\;. generateSecret (desSpec);
81 Cipher cipher = Cipher.getInstance (\83 return cipher.doFinal (plainText);
84}
85
86 ; / ** *//**
87 * production of 8-bit key
88 *
89 * @ param key
90 * string
91 ; * @ return
92 * @ throws UnsupportedEncodingException
93 * @ author yayagepei
94 * @ date 2008-10-8
95 * /
96 private static byte [] makeKey (String key)
97 throws UnsupportedEncodingException {
98 byte [] keyByte = new byte [8];
99 byte [] keyResult = key.getBytes (\for (int i = 0; i <keyResult.length & & i <keyByte.length; i + +) {
101 keyByte = keyResult;
102}
103 ; return keyByte;
104}
105
106 / ** *//**
107 * DES encryption
108 *
109 * @ param plainText
110 * expressly
111 * @ param key
112 * Key
113 * @ return
114 * @ author yayagepei
115 * @ date 2008-10-8
116 * /
117 public static String encoderByDES (String plainText, String key) {
118 try {
119 byte [] result = coderByDES (plainText.getBytes (\Cipher.ENCRYPT_MODE);
121 return byteArr2HexStr (result);
122} catch (Exception ex) {
123 ; ex.printStackTrace ();
124 return \;}
126}
127
128 / ** * / / * *
129 * DES decryption
130 *
131 * @ param secretText
132 ; * ciphertext
133 * @ param key
134 * Key
135 * @ return
136 * @ author yayagepei
137 * @ date 2008-10-8
138 * /
139 ; public static String decoderByDES (String secretText, String key) {
140 try {
141 ; byte [] result = coderByDES (hexStr2ByteArr (secretText), key,
142 Cipher.DECRYPT_MODE);
143 return new String (result,air force one, \; ex.printStackTrace ();
146 return \; / ** *//**
151 * the byte array is converted to that string of 16 hexadecimal values, such as: byte [] {8,air force one shoes,18 } into: 0813, and the public static byte []
152 * hexStr2ByteArr (String strIn) mutually reversible conversion process
153 *
154 * @ param arrB
155 * needs to be converted The byte array
156 * @ return the converted string
157 * /
158 private static String byteArr2HexStr (byte [] arrB) {
159 int iLen = arrB.length;
160 / / Each byte can be expressed with two characters, so the length of the string is twice the length of the array
161 StringBuffer sb = new StringBuffer ( iLen * 2);
162 for (int i = 0; i <iLen; i + +) {
163 int intTmp = arrB;
164 / / the negative into a positive
165 while (intTmp <0) {
166 intTmp = intTmp + 256;
167 ;}
168 / / less than the number required in front of 0F fill 0
169 if (intTmp <16) {
170 ; sb.append (\}
172 sb.append (Integer.toString (intTmp, 16));
173}
174 return sb.toString ();
175 ;}
176
177 / ** *//**
178 * to that string of 16 hexadecimal values converted to byte array,air force ones, and the public static String byteArr2HexStr (byte [] arrB)
179 * each other reversible conversion process
180 *
181 ; * @ param strIn
182 * to be converted
183 * @ return string the converted byte array
184 * @ throws NumberFormatException
186 * /
187 private static byte [] hexStr2ByteArr (String strIn)
188 throws NumberFormatException {
189 byte [] arrB = strIn.getBytes ();
190 int iLen = arrB.length;
191 / / two characters represent one byte, so the length of the string byte array length is divided by 2
192 byte [] arrOut = new byte [iLen / 2];
193 for ( int i = 0; i <iLen; i = i + 2) {
194 String strTmp = new String ( arrB, i, 2);
195 arrOut = (byte) Integer.parseInt (strTmp, 16);
196}
197 return arrOut;
198 ;}
199}