SecurityUtils

/**
*
*/
package com.paic.icore.acss.util;

import java.io.UnsupportedEncodingException;
import java.security.SecureRandom;

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;

import com.paic.icore.acss.util.constants.ConstantsForEncoding;

/**
* @author ZENGXIANGCAI926
* 2014年3月27日 下午9:31:07
* 加密工具类
*/
public class SecurityUtil {
private static final String ALGORITHM_AES = "AES"; // 使用AES加密
private static final int DIGIT_AES = 128; // AES加密位数
private static final String RNG = "SHA1PRNG"; // 随机数生成算法

/**
* AES加密
* @param content
* @param key
*/
public static byte[] encryptCodeByAES(byte[] content, String key) {
if (content == null || key == null) {
return null;
}
return disposalCodeByAES(content, key, Cipher.ENCRYPT_MODE);
}

/**
* AES解密
* @param content
* @param key
* @throws UnsupportedEncodingException
*/
public static byte[] decryptCodeByAES(byte[] content, String key) throws UnsupportedEncodingException {
if (content == null || key == null) {
return null;
}
return disposalCodeByAES(hex2byte(content), key, Cipher.DECRYPT_MODE);
}

/**
* AES加密
* 返回十六进制字符串
* @param content
* @param key
*/
public static String encapEncryptCodeByAES(byte[] content, String key) {
return binaryArrayToHexString(encryptCodeByAES(content, key));
}

/**
* 转换为十六进制字符串
* @param arr
*/
public static String binaryArrayToHexString(byte[] arr) {
if (arr == null || arr.length == 0) {
return null;
}
StringBuffer pool = new StringBuffer();
String hexString;
for (byte a : arr) {
hexString = Integer.toHexString(a & 0xFF);
if (hexString.length() == 1) {
pool.append("0");
}
pool.append(hexString);
}
return pool.toString().toUpperCase();
}

/**
* @author EX-ZHUYU001
* @param b
* @return
* @throws UnsupportedEncodingException
*/
public static byte[] hex2byte(byte[] content) throws UnsupportedEncodingException {
if ((content.length % 2) != 0)
throw new IllegalArgumentException("长度不是偶数");

byte[] byteContent = new byte[content.length / 2];

for (int n = 0; n < content.length; n += 2) {
String item = null;
item = new String(content, n, 2, ConstantsForEncoding.UTF8_ENCODING);
byteContent[n / 2] = (byte) Integer.parseInt(item, 16);
}
return byteContent;
}

/**
* AES处理byte数组
* @param specalStr
* @param mode
*/
private static byte[] disposalCodeByAES(byte[] content, String specalStr, int mode) {
try {
KeyGenerator key = KeyGenerator.getInstance(ALGORITHM_AES);
SecureRandom srandom = SecureRandom.getInstance(RNG);
srandom.setSeed(specalStr.getBytes(ConstantsForEncoding.UTF8_ENCODING));
key.init(DIGIT_AES, srandom);
SecretKeySpec specKey = new SecretKeySpec(key.generateKey().getEncoded(), ALGORITHM_AES);
Cipher cipher = Cipher.getInstance(ALGORITHM_AES);
cipher.init(mode, specKey);
return cipher.doFinal(content);
} catch (Exception e) {
LogUtils.error("SecurityUtil disposalCodeByAES 加密失败:" + e.getMessage(), e);
return null;
}
}

/**
* 使用SHA1PRNG算法加密
*
* @param content
* @param password
* @return
* @throws Exception
*/
public static String encryptSha1prng(String content, String password) throws Exception {
if (content == null || "".equals(content)) {
throw new Exception("加密内容不能为空");
}
if (password == null || "".equals(password)) {
throw new Exception("加密密钥不能为空");
}
// AES加密
KeyGenerator kgen = KeyGenerator.getInstance(ALGORITHM_AES);
SecureRandom sr = SecureRandom.getInstance(RNG);
sr.setSeed(password.getBytes(ConstantsForEncoding.UTF8_ENCODING));
kgen.init(128, sr);
SecretKey skey = kgen.generateKey();
byte[] raw = skey.getEncoded();
SecretKeySpec skeySpec = new SecretKeySpec(raw, ALGORITHM_AES);
Cipher cipher = Cipher.getInstance(ALGORITHM_AES);
cipher.init(Cipher.ENCRYPT_MODE, skeySpec);
// 加密
byte[] encoded = cipher.doFinal(content.getBytes(ConstantsForEncoding.UTF8_ENCODING));
return parseByte2HexStr(encoded);
}

/**
* 将二进制转换成16进制
*
* @param buf
* @return
*/
public static String parseByte2HexStr(byte buf[]) {
StringBuffer sb = new StringBuffer();
for (int i = 0; i < buf.length; i++) {
String hex = Integer.toHexString(buf[i] & 0xFF);
if (hex.length() == 1) {
hex = '0' + hex;
}
sb.append(hex.toUpperCase());
}
return sb.toString();
}

public static String asHex(byte buf[]) {
StringBuffer strbuf = new StringBuffer(buf.length * 2);
int i;
for (i = 0; i < buf.length; i++) {
if (((int) buf[i] & 0xff) < 0x10)
strbuf.append("0");
strbuf.append(Long.toString((int) buf[i] & 0xff, 16));
}
return strbuf.toString();
}

}

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