http://www.pocketdigi.com/20121112/940.html

原文：http://toptulip.iteye.com/blog/780309 使用php加密字符串，生成密文，java解析密文还原字符串.
Java的部分直接复制调不通，改了下，下面的代码是能正常运行的。
php:

1. <?php
2. class DES
3. {
4. var $key;
5. var $iv; //偏移量
6. function DES($key, $iv=0)
7. {
8. $this->key = $key;
9. if($iv == 0)
10. {
11. $this->iv = $key;
12. }
13. else
14. {
15. $this->iv = $iv;
16. }
17. }
18. //加密
19. function encrypt($str)
20. {
21. $size = mcrypt_get_block_size ( MCRYPT_DES, MCRYPT_MODE_CBC );
22. $str = $this->pkcs5Pad ( $str, $size );
23. $data=mcrypt_cbc(MCRYPT_DES, $this->key, $str, MCRYPT_ENCRYPT, $this->iv);
24. //$data=strtoupper(bin2hex($data)); //返回大写十六进制字符串
25. return base64_encode($data);
26. }
27. //解密
28. function decrypt($str)
29. {
30. $str = base64_decode ($str);
31. //$strBin = $this->hex2bin( strtolower($str));
32. $str = mcrypt_cbc(MCRYPT_DES, $this->key, $str, MCRYPT_DECRYPT, $this->iv );
33. $str = $this->pkcs5Unpad( $str );
34. return $str;
35. }
36. function hex2bin($hexData)
37. {
38. $binData = "";
39. for($i = 0; $i < strlen ( $hexData ); $i += 2)
40. {
41. $binData .= chr(hexdec(substr($hexData, $i, 2)));
42. }
43. return $binData;
44. }
45. function pkcs5Pad($text, $blocksize)
46. {
47. $pad = $blocksize - (strlen ( $text ) % $blocksize);
48. return $text . str_repeat ( chr ( $pad ), $pad );
49. }
50. function pkcs5Unpad($text)
51. {
52. $pad = ord ( $text {strlen ( $text ) - 1} );
53. if ($pad > strlen ( $text ))
54. return false;
55. if (strspn ( $text, chr ( $pad ), strlen ( $text ) - $pad ) != $pad)
56. return false;
57. return substr ( $text, 0, - 1 * $pad );
58. }
59. }
60. $str = 'abcd';
61. $key= 'asdfwef5';
62. $crypt = new DES($key);
63. $mstr = $crypt->encrypt($str);
64. $str = $crypt->decrypt($mstr);
65. echo $str.' <=> '.$mstr;
66. ?>

java:

1. package com.test;
2. import it.sauronsoftware.base64.Base64;
3. import java.security.Key;
4. import java.security.SecureRandom;
5. import java.security.spec.AlgorithmParameterSpec;
6. import javax.crypto.Cipher;
7. import javax.crypto.SecretKeyFactory;
8. import javax.crypto.spec.DESKeySpec;
9. import javax.crypto.spec.IvParameterSpec;
10. public class Main
11. {
12. public static final String ALGORITHM_DES = "DES/CBC/PKCS5Padding";
13. /**
14. * DES算法，加密
15. *
16. * @param data 待加密字符串
17. * @param key 加密私钥，长度不能够小于8位
18. * @return 加密后的字节数组，一般结合Base64编码使用
19. * @throws CryptException 异常
20. */
21. public static String encode(String key,String data) throws Exception
22. {
23. return encode(key, data.getBytes());
24. }
25. /**
26. * DES算法，加密
27. *
28. * @param data 待加密字符串
29. * @param key 加密私钥，长度不能够小于8位
30. * @return 加密后的字节数组，一般结合Base64编码使用
31. * @throws CryptException 异常
32. */
33. public static String encode(String key,byte[] data) throws Exception
34. {
35. try
36. {
37. DESKeySpec dks = new DESKeySpec(key.getBytes());
38. SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
39. //key的长度不能够小于8位字节
40. Key secretKey = keyFactory.generateSecret(dks);
41. Cipher cipher = Cipher.getInstance(ALGORITHM_DES);
42. IvParameterSpec iv = new IvParameterSpec(key.getBytes());
43. AlgorithmParameterSpec paramSpec = iv;
44. cipher.init(Cipher.ENCRYPT_MODE, secretKey,paramSpec);
45. byte[] bytes = cipher.doFinal(data);
46. // return byte2hex(bytes);
47. return new String(Base64.encode(bytes));
48. } catch (Exception e)
49. {
50. throw new Exception(e);
51. }
52. }
53. /**
54. * DES算法，解密
55. *
56. * @param data 待解密字符串
57. * @param key 解密私钥，长度不能够小于8位
58. * @return 解密后的字节数组
59. * @throws Exception 异常
60. */
61. public static byte[] decode(String key,byte[] data) throws Exception
62. {
63. try
64. {
65. SecureRandom sr = new SecureRandom();
66. DESKeySpec dks = new DESKeySpec(key.getBytes());
67. SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
68. //key的长度不能够小于8位字节
69. Key secretKey = keyFactory.generateSecret(dks);
70. Cipher cipher = Cipher.getInstance(ALGORITHM_DES);
71. IvParameterSpec iv = new IvParameterSpec(key.getBytes());
72. AlgorithmParameterSpec paramSpec = iv;
73. cipher.init(Cipher.DECRYPT_MODE, secretKey,paramSpec);
74. return cipher.doFinal(data);
75. } catch (Exception e)
76. {
77. throw new Exception(e);
78. }
79. }
80. /**
81. * 获取编码后的值
82. * @param key
83. * @param data
84. * @return
85. * @throws Exception
86. */
87. public static String decodeValue(String key,String data)
88. {
89. byte[] datas;
90. String value = null;
91. try {
92. datas = decode(key, Base64.decode(data.getBytes()));
93. value = new String(datas);
94. } catch (Exception e) {
95. value = "";
96. }
97. return value;
98. }
99. public static void main(String[] args) throws Exception
100. {
101. System.out.println("明：abcd ；密：" + Main.encode("asdfwef5","abcd"));
102. }
103. }