Java加密算法(DES,MD5)
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import java.security.Security;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
public class DesEncode {
private static String Algorithm="DES"; //定义 加密算法,可用 DES,DESede,Blowfish
private static boolean debug = false;
static{
Security.addProvider(new com.sun.crypto.provider.SunJCE());
}
//生成密钥
public static byte[] getKey() throws Exception{
byte[] key = {-50, -46, -78, -69, -42, -86, -75, -64};
if (debug) {
System.out.println("生成密钥:"+byte2hex(key));
}
return key;
}
//加密
public static String encode(String input) throws Exception{
SecretKey deskey = new javax.crypto.spec.SecretKeySpec(getKey(),Algorithm);
if (debug){
System.out.println("加密前的字符串:"+input);
System.out.println("加密前的二进串:"+byte2hex(input.getBytes()));
}
Cipher c1 = Cipher.getInstance(Algorithm);
c1.init(Cipher.ENCRYPT_MODE,deskey);
byte[] cipherByte=c1.doFinal(input.getBytes());
if (debug)
System.out.println("加密后的二进串:"+byte2hex(cipherByte));
return byte2hex(cipherByte);
}
//解密
public static String decode(String input) throws Exception{
SecretKey deskey = new javax.crypto.spec.SecretKeySpec(getKey(),Algorithm);
if (debug) {
System.out.println("解密前的信息:"+input);
}
Cipher c1 = Cipher.getInstance(Algorithm);
c1.init(Cipher.DECRYPT_MODE,deskey);
byte[] clearByte=c1.doFinal(hex2byte(input));
if (debug){
System.out.println("解密后的二进串:"+byte2hex(clearByte));
System.out.println("解密后的字符串:"+(new String(clearByte)));
}
return new String(clearByte);
}
//md5()信息摘要, 不可逆
public static String md5(String input) throws Exception{
java.security.MessageDigest alg=java.security.MessageDigest.getInstance("MD5"); //or "SHA-1"
if (debug){
System.out.println("摘要前的二进串:"+byte2hex(input.getBytes()));
System.out.println("摘要前的字符串:"+input);
}
alg.update(input.getBytes());
byte[] digest = alg.digest();
if (debug)
System.out.println("摘要后的二进串:"+byte2hex(digest));
return byte2hex(digest);
}
//字节码转换成16进制字符串
public static String byte2hex(byte[] b) {
String hs="";
String stmp="";
for (int n=0;n<b.length;n++){
stmp=(java.lang.Integer.toHexString(b[n] & 0XFF));
if (stmp.length()==1)
hs=hs+"0"+stmp;
else hs=hs+stmp;
//if (n<b.length-1) hs=hs+":";
}
return hs.toUpperCase();
}
//16进制字符串转换成字节码
public static byte[] hex2byte(String h) {
byte[] ret = new byte[h.length()/2];
for(int i=0; i<ret.length; i++){
ret[i] = Integer.decode("#"+h.substring(2*i, 2*i+2)).byteValue();
}
return ret;
}
public static void main(String[] args) throws Exception{
debug = true;
decode(encode("测试加密"));
md5("haohao学习啊");
}
}
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
public class DesEncode {
private static String Algorithm="DES"; //定义 加密算法,可用 DES,DESede,Blowfish
private static boolean debug = false;
static{
Security.addProvider(new com.sun.crypto.provider.SunJCE());
}
//生成密钥
public static byte[] getKey() throws Exception{
byte[] key = {-50, -46, -78, -69, -42, -86, -75, -64};
if (debug) {
System.out.println("生成密钥:"+byte2hex(key));
}
return key;
}
//加密
public static String encode(String input) throws Exception{
SecretKey deskey = new javax.crypto.spec.SecretKeySpec(getKey(),Algorithm);
if (debug){
System.out.println("加密前的字符串:"+input);
System.out.println("加密前的二进串:"+byte2hex(input.getBytes()));
}
Cipher c1 = Cipher.getInstance(Algorithm);
c1.init(Cipher.ENCRYPT_MODE,deskey);
byte[] cipherByte=c1.doFinal(input.getBytes());
if (debug)
System.out.println("加密后的二进串:"+byte2hex(cipherByte));
return byte2hex(cipherByte);
}
//解密
public static String decode(String input) throws Exception{
SecretKey deskey = new javax.crypto.spec.SecretKeySpec(getKey(),Algorithm);
if (debug) {
System.out.println("解密前的信息:"+input);
}
Cipher c1 = Cipher.getInstance(Algorithm);
c1.init(Cipher.DECRYPT_MODE,deskey);
byte[] clearByte=c1.doFinal(hex2byte(input));
if (debug){
System.out.println("解密后的二进串:"+byte2hex(clearByte));
System.out.println("解密后的字符串:"+(new String(clearByte)));
}
return new String(clearByte);
}
//md5()信息摘要, 不可逆
public static String md5(String input) throws Exception{
java.security.MessageDigest alg=java.security.MessageDigest.getInstance("MD5"); //or "SHA-1"
if (debug){
System.out.println("摘要前的二进串:"+byte2hex(input.getBytes()));
System.out.println("摘要前的字符串:"+input);
}
alg.update(input.getBytes());
byte[] digest = alg.digest();
if (debug)
System.out.println("摘要后的二进串:"+byte2hex(digest));
return byte2hex(digest);
}
//字节码转换成16进制字符串
public static String byte2hex(byte[] b) {
String hs="";
String stmp="";
for (int n=0;n<b.length;n++){
stmp=(java.lang.Integer.toHexString(b[n] & 0XFF));
if (stmp.length()==1)
hs=hs+"0"+stmp;
else hs=hs+stmp;
//if (n<b.length-1) hs=hs+":";
}
return hs.toUpperCase();
}
//16进制字符串转换成字节码
public static byte[] hex2byte(String h) {
byte[] ret = new byte[h.length()/2];
for(int i=0; i<ret.length; i++){
ret[i] = Integer.decode("#"+h.substring(2*i, 2*i+2)).byteValue();
}
return ret;
}
public static void main(String[] args) throws Exception{
debug = true;
decode(encode("测试加密"));
md5("haohao学习啊");
}
}
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