java简单加密代码 java加密的几种方法(16)


publicstaticStringbyte2hex (byte [] b )
{
Stringhs ="";
Stringstmp ="";
for(intn =0 ;n b.length ;n ++)
{
stmp =(java.lang.Integer.toHexString (b [n ]0XFF ));
if(stmp.length ()==1 ) hs =hs +"0"+stmp ;
elsehs =hs +stmp ;
if(n b.length -1 ) hs =hs +":";
} returnhs.toUpperCase ();
}
/**
* 字符串转成字节数组.
* @param hex 要转化的字符串.
* @return byte[] 返回转化后的字符串.
*/
public static byte[] hexStringToByte(String hex) {
int len = (hex.length() / 2);
byte[] result = new byte[len];
char[] achar = hex.toCharArray();
for (int i = 0; ilen; i++) {
int pos = i * 2;
result[i] = (byte) (toByte(achar[pos])4 | toByte(achar[pos + 1]));
}
return result;
}
private static byte toByte(char c) {
byte b = (byte) "0123456789ABCDEF".indexOf(c);
return b;
}
/**
* 字节数组转成字符串.
* @param String 要转化的字符串.
* @return 返回转化后的字节数组.
*/
public static final String bytesToHexString(byte[] bArray) {
StringBuffer sb = new StringBuffer(bArray.length);
String sTemp;
for (int i = 0; ibArray.length; i++) {
sTemp = Integer.toHexString(0xFFbArray[i]);
if (sTemp.length()2)
sb.append(0);
sb.append(sTemp.toUpperCase());
}
return sb.toString();
}
/**
* 从数据库中获取密钥.
* @param deptid 企业id.
* @return 要返回的字节数组.
* @throws Exception 可能抛出的异常.
*/
public static byte[] getSecretKey(long deptid) throws Exception {
byte[] key=null;
String value=https://www.04ip.com/post/null;
//CommDao dao=new CommDao();
// List list=dao.getRecordList("from Key k where k.deptid="+deptid);
//if(list.size()0){
//value=https://www.04ip.com/post/((com.csc.sale.bean.Key)list.get(0)).getKey();
value = "https://www.04ip.com/post/CB7A92E3D3491964";
key=hexStringToByte(value);
//}
if (debug)
System.out.println("密钥:" + value);
return key;
}
public String encryptData2(String data) {
String en = null;
try {
byte[] key=hexStringToByte(this.key);
en = bytesToHexString(encryptData(data.getBytes(),key));
} catch (Exception e) {
e.printStackTrace();
}
return en;
}
public String decryptData2(String data) {
String de = null;
try {
byte[] key=hexStringToByte(this.key);
de = new String(decryptData(hexStringToByte(data),key));
} catch (Exception e) {
e.printStackTrace();
}
return de;
}
} 加密使用:byte[] key=Eryptogram.getSecretKey(deptid);//获得钥匙(字节数组)
byte[] tmp=Eryptogram.encryptData(password.getBytes(), key);//传入密码和钥匙 , 获得加密后的字节数组的密码
password=Eryptogram.bytesToHexString(tmp);//将字节数组转化为字符串,获得加密后的字符串密码解密与之差不多
java加密的几种方式基本java简单加密代码的单向加密算法java简单加密代码:
BASE64 严格地说,属于编码格式,而非加密算法
MD5(Message Digest algorithm 5,信息摘要算法)
SHA(Secure Hash Algorithm,安全散列算法)
HMAC(Hash Message Authentication Code,散列消息鉴别码)
复杂java简单加密代码的对称加密(DES、PBE)、非对称加密算法:
DES(Data Encryption Standard,数据加密算法)
PBE(Password-based encryption,基于密码验证)
RSA(算法的名字以发明者的名字命名:Ron Rivest, AdiShamir 和Leonard Adleman)
DH(Diffie-Hellman算法,密钥一致协议)
DSA(Digital Signature Algorithm,数字签名)
ECC(Elliptic Curves Cryptography , 椭圆曲线密码编码学)

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