java使用AES加密解密 AES

1import javax.crypto.Cipher;
2import javax.crypto.spec.SecretKeySpec;
3
4import org.apache.commons.codec.binary.Base64;
5/**
6 *
7 * @author Administrator
8 *
9 */
10public class AES {
11
12    // 加密
13    public static String Encrypt(String sSrc, String sKey) throws Exception {
14        if (sKey == null) {
15            System.out.print("Key为空null");
16            return null;
17        }
18        // 判断Key是否为16位
19        if (sKey.length() != 16) {
20            System.out.print("Key长度不是16位");
21            return null;
22        }
23        byte[] raw = sKey.getBytes("utf-8");
24        SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
25        Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");//"算法/模式/补码方式"
26        cipher.init(Cipher.ENCRYPT_MODE, skeySpec);
27        byte[] encrypted = cipher.doFinal(sSrc.getBytes("utf-8"));
28
29        return new Base64().encodeToString(encrypted);//此处使用BASE64做转码功能，同时能起到2次加密的作用。
30    }
31
32    // 解密
33    public static String Decrypt(String sSrc, String sKey) throws Exception {
34        try {
35            // 判断Key是否正确
36            if (sKey == null) {
37                System.out.print("Key为空null");
38                return null;
39            }
40            // 判断Key是否为16位
41            if (sKey.length() != 16) {
42                System.out.print("Key长度不是16位");
43                return null;
44            }
45            byte[] raw = sKey.getBytes("utf-8");
46            SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
47            Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
48            cipher.init(Cipher.DECRYPT_MODE, skeySpec);
49            byte[] encrypted1 = new Base64().decode(sSrc);//先用base64解密
50            try {
51                byte[] original = cipher.doFinal(encrypted1);
52                String originalString = new String(original,"utf-8");
53                return originalString;
54            } catch (Exception e) {
55                System.out.println(e.toString());
56                return null;
57            }
58        } catch (Exception ex) {
59            System.out.println(ex.toString());
60            return null;
61        }
62    }
63
64    public static void main(String[] args) throws Exception {
65        /*
66         * 此处使用AES-128-ECB加密模式，key需要为16位。
67         */
68        String cKey = "1234567890123456";
69        // 需要加密的字串
70        String cSrc = "www.gowhere.so";
71        System.out.println(cSrc);
72        // 加密
73        String enString = AES.Encrypt(cSrc, cKey);
74        System.out.println("加密后的字串是：" + enString);
75
76        // 解密
77        String DeString = AES.Decrypt(enString, cKey);
78        System.out.println("解密后的字串是：" + DeString);
79    }
80}