1、BASE64
Base64定义:Base64内容传送编码被设计用来把任意序列的8位字节描述为一种不易被人直接识别的形式。(The Base64 Content-Transfer-Encoding is designed to represent arbitrary sequences of octets in a form that need not be humanly readable.)
常见于邮件、http加密,截取http信息,你就会发现登录操作的用户名、密码字段通过BASE64加密的。
实例:
Java代码 复制代码 收藏代码
1.package cn.tzz.java.crypto;
2.
3.import java.io.IOException;
4.
5.import sun.misc.BASE64Decoder;
6.import sun.misc.BASE64Encoder;
7.
8.public class BASE64Util {
9. /**加密*/
10. public static String encrypt(byte[] key) {
11. return (new BASE64Encoder()).encodeBuffer(key);
12. }
13.
14. /**解密*/
15. public static String decrypt(String key) {
16. try {
17. return new String((new BASE64Decoder()).decodeBuffer(key),"utf-8");
18. } catch (IOException e) {
19. e.printStackTrace();
20. }
21. return null;
22. }
23.
24. public static void main(String[] args) {
25. String encryptStr = encrypt("123456".getBytes());
26. System.out.println("加密:"+encryptStr);
27. System.out.println("解密:"+decrypt(encryptStr));
28. }
29.}
2、MD5&SHA
MD5 -- message-digest algorithm 5 (信息-摘要算法)
SHA(Secure Hash Algorithm,安全散列算法)
Java代码 复制代码 收藏代码
1.package cn.tzz.java.crypto.simple;
2.
3.import java.security.MessageDigest;
4.import java.security.NoSuchAlgorithmException;
5.
6.public class MD5SHACryptoUtil {
7.
8. /**md5加密*/
9. public static String md5Encrypt(String str) {
10. String md5String = null;
11. try {
12. // 获得MD5摘要算法的 MessageDigest 对象
13. MessageDigest md = MessageDigest.getInstance("MD5");
14. // 使用指定的字节更新摘要
15. md.update(str.getBytes());
16. // 获得密文,把密文转换成十六进制的字符串形式
17. //方式一
18. md5String = byte2Hex(md.digest());
19. //方式二
20. //md5String = byteToHex(md.digest());
21. //方式三
22. //md5String = byteToString(md.digest());
23. } catch (Exception ex) {
24. ex.printStackTrace();
25. }
26. return md5String;
27. }
28.
29. /**SHA1加密*/
30. public static String shaEncrypt(String date) {
31. byte[] digest = null;
32. String rs = null;
33. try {
34. // 得到一个SHA-1的消息摘要
35. MessageDigest messageDigest = MessageDigest.getInstance("SHA-1");
36. // 添加要进行计算摘要的信息
37. messageDigest.update(date.getBytes());
38. // 得到该摘要
39. digest = messageDigest.digest();
40. // 将摘要转为字符串
41. rs = byte2Hex(digest);
42. } catch (NoSuchAlgorithmException e) {
43. e.printStackTrace();
44. }
45. return rs;
46. }
47.
48. // 1.把密文转换成十六进制的字符串形式(Integer.toHexString函数)
49. public static String byte2Hex(byte[] b) {
50. StringBuffer sb = new StringBuffer();
51. String tmp = "";
52. for (int i = 0; i < b.length; i++) {
53. tmp = Integer.toHexString(b[i] & 0XFF);
54. if (tmp.length() == 1){
55. sb.append("0");
56. }
57. sb.append(tmp);
58. }
59. return sb.toString();
60. }
61.
62. // 2.把密文转换成十六进制的字符串形式(自定义)
63. public static String byteToHex(byte[] b) {
64. // 全局数组
65. char[] hexDigits = {'0' , '1' , '2' , '3' , '4' , '5' ,'6' , '7' , '8' , '9' , 'a' , 'b' ,
66. 'c' , 'd' , 'e' , 'f'};
67. // 把密文转换成十六进制的字符串形式
68. int j = b.length;
69. char str[] = new char[j * 2];
70. int k = 0;
71. for (int i = 0; i < j; i++) {
72. byte byte0 = b[i];
73. str[k++] = hexDigits[byte0 >>> 4 & 0xf];
74. str[k++] = hexDigits[byte0 & 0xf];
75. }
76. return new String(str);
77. }
78.
79. // 3.转换字节数组为16进制字串
80. private static String byteToString(byte[] b) {
81. StringBuffer sBuffer = new StringBuffer();
82. for (int i = 0; i < b.length; i++) {
83. sBuffer.append(byteToArrayString(b[i]));
84. }
85. return sBuffer.toString();
86. }
87.
88. // 返回形式为数字跟字符串
89. private static String byteToArrayString(byte b) {
90. String[] strDigits = { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a", "b", "c", "d", "e", "f" };
91. int iRet = b;
92. if (iRet < 0) {
93. iRet += 256;
94. }
95. int iD1 = iRet / 16;
96. int iD2 = iRet % 16;
97. return strDigits[iD1] + strDigits[iD2];
98. }
99.
100. public static void main(String[] args) {
101. System.out.println(md5Encrypt("123456"));
102. System.out.println(shaEncrypt("123456"));
103. }
104.}
java的几种常用的加密
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转载自weitao1026.iteye.com/blog/2266328
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