分类：
2008-09-09 13:31:16
JAVA实现的AZDG加密-解密算法。源程序:
import java.io.IOException;
import java.security.MessageDigest;
public class Azdg {
public static void main(String[] args) {
Azdg azdg = new Azdg();
System.out.println(System.currentTimeMillis()/1000);
String clearText = "no=sh0105&time=12319399372223`112r3r223";//明文
String cipherText = "";//密文
String cleanText = "";//解密后的
String key = "1234567890";//密钥，可自定义
System.out.println("明文为：" + clearText);
cipherText = azdg.encrypt(clearText, key);
System.out.println("加密后为："+cipherText);
cleanText = azdg.decrypt(cipherText, key);
System.out.println("解密后为："+cleanText);
}
/**
* 加密算法
* */
public String encrypt(String txt, String key) {
String encrypt_key = "0f9cfb7a9acced8a4167ea8006ccd098";
int ctr = 0;
String tmp = "";
int i;
for (i = 0; i < txt.length(); i++) {
ctr = (ctr == encrypt_key.length()) ? 0 : ctr;
tmp = tmp + encrypt_key.charAt(ctr)
+ (char)(txt.charAt(i) ^ encrypt_key.charAt(ctr));
ctr++;
}
return base64_encode(key(tmp, key));
}
/**
* 解密算法
*/
public String decrypt(String cipherText, String key) {
// base64解码
cipherText = base64_decode(cipherText);
cipherText = key(cipherText, key);
String tmp = "";
for (int i = 0; i < cipherText.length(); i++) {
int c = cipherText.charAt(i) ^ cipherText.charAt(i + 1);
String x = "" + (char) c;
tmp += x;
i++;
}
return tmp;
}
public String key(String txt, String encrypt_key) {
encrypt_key = strMD5(encrypt_key);
int ctr = 0;
String tmp = "";
for (int i = 0; i < txt.length(); i++) {
ctr = (ctr == encrypt_key.length()) ? 0 : ctr;
int c = txt.charAt(i) ^ encrypt_key.charAt(ctr);
String x = "" + (char) c;
tmp = tmp + x;
ctr++;
}
return tmp;
}
public String base64_encode(String str) {
return new sun.misc.BASE64Encoder().encode(str.getBytes());
}
public String base64_decode(String str) {
sun.misc.BASE64Decoder decoder = new sun.misc.BASE64Decoder();
if (str == null)
return null;
try {
return new String(decoder.decodeBuffer(str));
} catch (IOException e) {
e.printStackTrace();
return null;
}
}
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