Java之加密，信息摘要工具类

依赖于java.security.MessageDigest,支持MD5,SHA-1,SHA-256

 1 import java.security.MessageDigest;
 2 import java.security.NoSuchAlgorithmException;
 3 
 4 /**
 5  * CiphertextUtil
 6  *
 7  * @author ysj
 8  */
 9 public class CiphertextUtil {
10     public static final String MD5 = "MD5";
11     public static final String SHA_1 = "SHA-1";
12     public static final String SHA_256 = "SHA-256";
13     private static final char[] CH_HEX = {'0', '1', '2', '3', '4', '5', '6', '7', '8',
14         '9', 'A', 'B', 'C', 'D', 'E', 'F'};
15 
16     /**
17      * 加密字符串
18      * 
19      * @param sourceStr    需要加密目标字符串
20      * @param algorithmsName 算法名称(如:MD5,SHA-1,SHA-256)
21      * @return
22      */
23     public static String passAlgorithmsCiphering(String sourceStr,String algorithmsName){
24         String password = "";
25         MessageDigest md;
26         try {
27             md = MessageDigest.getInstance(algorithmsName);
28             // 使用指定byte[]更新摘要
29             md.update(sourceStr.getBytes());
30             // 完成计算，返回结果数组
31             byte[] b = md.digest();
32             password = byteArrayToHex(b);
33         } catch (NoSuchAlgorithmException e) {
34             e.printStackTrace();
35         }
36         return password;
37     }
38 
39     /**
40      * 将字节数组转为十六进制字符串
41      *
42      * @param bytes
43      * @return 返回16进制字符串
44      */
45     private static String byteArrayToHex(byte[] bytes) {
46         // 一个字节占8位，一个十六进制字符占4位；十六进制字符数组的长度为字节数组长度的两倍
47         char[] chars = new char[bytes.length * 2];
48         int index = 0;
49         for (byte b : bytes) {
50             // 取字节的高4位
51             chars[index++] = CH_HEX[b >>> 4 & 0xf];
52             // 取字节的低4位
53             chars[index++] = CH_HEX[b & 0xf];
54         }
55         return new String(chars);
56     }
57 }

依赖于org.apache.commons.codec.digest.DigestUtils,支持MD2,MD5,SHA-1,SHA-256,SHA-384,SHA-512

Apache下载地址:http://commons.apache.org/proper/commons-codec/download_codec.cgi

 1 import org.apache.commons.codec.digest.DigestUtils;
 2 
 3 /**
 4  * CiphertextUtil
 5  *
 6  * @author ysj
 7  */
 8 public class CiphertextUtil {
 9     public static final String MD2 = "MD2";
10     public static final String MD5 = "MD5";
11     public static final String SHA_1 = "SHA1";
12     public static final String SHA_256 = "SHA256";
13     public static final String SHA_384 = "SHA384";
14     public static final String SHA_512 = "SHA512";
15 
16     /**
17      * 加密字符串
18      * 
19      * @param sourceStr    需要加密目标字符串
20      * @param algorithmsName 算法名称(如:MD2,MD5,SHA1,SHA256,SHA384,SHA512)
21      * @return
22      */
23     public static String passAlgorithmsCiphering(String sourceStr,String algorithmsName){
24         String password = "";
25         switch(algorithmsName){
26         case "MD2":
27             password = DigestUtils.md2Hex(sourceStr);
28             break;
29         case "MD5":
30             password = DigestUtils.md5Hex(sourceStr);
31             break;
32         case "SHA1":
33             password = DigestUtils.sha1Hex(sourceStr);
34             break;
35         case "SHA256":
36             password = DigestUtils.sha256Hex(sourceStr);
37             break;
38         case "SHA384":
39             password = DigestUtils.sha384Hex(sourceStr);
40             break;
41         case "SHA512":
42             password = DigestUtils.sha512Hex(sourceStr);
43             break;
44         }
45         return password;
46     }
47 }