附上对方给的JAVA代码示例，懂的给提提意见！
import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import java.security.*;
/**
* @author guoxc
* @create 2009-10-22
*/
public class Cryptogram {
private static byte[] defaultIV = {1,2,3,4,5,6,7,8};
private static byte chr2hex(String chr) {
if (chr.equals("0")) {
return 0x00;
} else if (chr.equals("1")) {
return 0x01;
} else if (chr.equals("2")) {
return 0x02;
} else if (chr.equals("3")) {
return 0x03;
} else if (chr.equals("4")) {
return 0x04;
} else if (chr.equals("5")) {
return 0x05;
} else if (chr.equals("6")) {
return 0x06;
} else if (chr.equals("7")) {
return 0x07;
} else if (chr.equals("8")) {
return 0x08;
} else if (chr.equals("9")) {
return 0x09;
} else if (chr.equals("A")) {
return 0x0a;
} else if (chr.equals("B")) {
return 0x0b;
} else if (chr.equals("C")) {
return 0x0c;
} else if (chr.equals("D")) {
return 0x0d;
} else if (chr.equals("E")) {
return 0x0e;
} else if (chr.equals("F")) {
return 0x0f;
}
return 0x00;
}
public static byte[] HexStringToByteArray(String s) {
byte[] buf = new byte[s.length() / 2];
for (int i = 0; i < buf.length; i++) {
buf[i] = (byte) (chr2hex(s.substring(i * 2, i * 2 + 1)) * 0x10 + chr2hex(s
.substring(i * 2 + 1, i * 2 + 2)));
}
System.out.println("hhhh:"+buf.toString());
return buf;
}
/**
* Encrypt the data by the key.
* @param OriSource
* @return strResult
* @throws Exception
*/
public static String encryptByKey(String OriSource, String key) throws Exception {
String strResult = "";
try {
Cipher c3des = Cipher.getInstance("DESede/CBC/PKCS5Padding");
SecretKeySpec myKey = new SecretKeySpec(HexStringToByteArray(key),
"DESede");
IvParameterSpec ivspec = new IvParameterSpec(defaultIV);
c3des.init(Cipher.ENCRYPT_MODE, myKey, ivspec);
byte[] testSrc = OriSource.getBytes("utf-8");
byte[] encoded = c3des.doFinal(testSrc);
strResult = Base64Encrypt.getBASE64_byte(encoded);
} catch (Exception e) {
strResult="";
System.out.println("Encrypt failure!!!");
}
return strResult;
}
/**
* Decrypt the encrypted data with the key.
* @param strData
* @return strResult
* @throws Exception
*/
public static String decryptByKey(String encryptedData, String key) throws Exception {
String strResult = "";
try {
Cipher c3des = Cipher.getInstance("DESede/CBC/PKCS5Padding");
SecretKeySpec myKey = new SecretKeySpec(HexStringToByteArray(key),
"DESede");
IvParameterSpec ivspec = new IvParameterSpec(defaultIV);
c3des.init(Cipher.DECRYPT_MODE, myKey, ivspec);
byte[] s= Base64Encrypt.getByteArrFromBase64(encryptedData);
byte[] encoded = c3des.doFinal(s);
strResult = new String(encoded,"utf-8");
} catch (Exception e) {
strResult="";
System.out.println("Decrypt failure!!!");
}
return strResult;
}
/**
* Decrypt the encrypted data with the key.
* @param strData
* @return strResult
* @throws Exception
*/
public static String getBase64HashString(String str) throws Exception{
byte[] testSrc = str.getBytes();
MessageDigest alga = MessageDigest.getInstance("SHA-1");
alga.update(testSrc);
byte[] digesta = alga.digest();
return Base64Encrypt.getBASE64_byte(digesta);
}
/**
* Decrypt the encrypted data with the key.
* @param strData
* @return strResult
* @throws Exception
*/
public static String getAuthenicator(String sourceStr,String key) throws Exception{
String strResult = "";
try {
Cipher c3des = Cipher.getInstance("DESede/CBC/PKCS5Padding");
SecretKeySpec myKey = new SecretKeySpec(HexStringToByteArray(key),
"DESede");
IvParameterSpec ivspec = new IvParameterSpec(defaultIV);
c3des.init(Cipher.ENCRYPT_MODE, myKey, ivspec);
byte[] testSrc = sourceStr.getBytes();
MessageDigest alga = MessageDigest.getInstance("SHA-1");
alga.update(testSrc);
byte[] digesta = alga.digest();
byte[] encoded = c3des.doFinal(digesta);
strResult = Base64Encrypt.getBASE64_byte(encoded);
} catch (Exception e) {
strResult="";
System.out.println("Decrypt failure!!!" + e.getMessage());
}
return strResult;
}
public static void main(String args[]) throws Exception {
String SysID = "0005郭";
String TimeStamp = "2009-10-22 13:15:20";
String ReturnURL = "http://vnet.cn/passportinterface/test2.aspx郭";
String Key = "941033C39066FBB8DFB9DC5306250ADCCA947F58D9756D56";
try{
//Get Digest.
String Digest = getBase64HashString(SysID + TimeStamp + ReturnURL);
System.out.println("The Base64HashString data :" + Digest);
//Get 3DES data.
String EncryptStr = encryptByKey("hello",Key);
//String EncryptStr = "你好";
System.out.println("The Encrypted data :" + EncryptStr);
//String DecryptStr = decryptByKey("EPjZO26ZZBk=",Key);
//System.out.println("The Decrypted data :" + DecryptStr);
String A = "guo";
//A = getAuthenicator(A,Key);
//System.out.print("The Encrypted data :" + A);
}
catch(Exception Ex){
Ex.printStackTrace();
}
}
}
