package cloud.simple.service.util;
import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;
/**
* <h3>概要:</h3>
* 加密工具类
* <br>
* <h3>功能:</h3>
* <ol>
* <li>提供md5sha1ase643des 加密</li>
* </ol>
* <ol>
* </ol>
*/
public class EncryptUtil {
private EncryptUtil() {}
/*========================================================================================*/
/*===================================BASE64 部分===========================================*/
private static final byte[] DECODE_TABLE = new byte[] { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 62, 0, 0, 0, 63, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 0,
0, 0, 0, 0, 0, 0, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 0, 0, 0, 0, 0, 0, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 0,
0, 0, 0, 0 };
// "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/ "
private static final byte[] ENCODE_TABLE = new byte[] { 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113,
114, 115, 116, 117, 118, 119, 120, 121, 122, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 43, 47 };
static {
int index = 0;
for (char c = 'A'; c <= 'Z'; c++)
ENCODE_TABLE[index++] = (byte) c;
for (char c = 'a'; c <= 'z'; c++)
ENCODE_TABLE[index++] = (byte) c;
for (char c = '0'; c <= '9'; c++)
ENCODE_TABLE[index++] = (byte) c;
ENCODE_TABLE[index++] = (byte) '+';
ENCODE_TABLE[index++] = (byte) '/';
// create decode table
for (int i = 0; i < 64; i++)
DECODE_TABLE[ENCODE_TABLE[i]] = (byte) i;
}
/**
* base64加密
* 每个参数，返回值注明含义
* @param data
* @return
*/
public static byte[] Base64Encode(byte[] data) {
if (data == null)
return null;
int fullGroups = data.length / 3;
int resultBytes = fullGroups * 4;
if (data.length % 3 != 0)
resultBytes += 4;
byte[] result = new byte[resultBytes];
int resultIndex = 0;
int dataIndex = 0;
int temp = 0;
for (int i = 0; i < fullGroups; i++) {
temp = (data[dataIndex++] & 0xff) << 16 | (data[dataIndex++] & 0xff) << 8 | data[dataIndex++] & 0xff;
result[resultIndex++] = ENCODE_TABLE[(temp >> 18) & 0x3f];
result[resultIndex++] = ENCODE_TABLE[(temp >> 12) & 0x3f];
result[resultIndex++] = ENCODE_TABLE[(temp >> 6) & 0x3f];
result[resultIndex++] = ENCODE_TABLE[temp & 0x3f];
}
temp = 0;
while (dataIndex < data.length) {
temp <<= 8;
temp |= data[dataIndex++] & 0xff;
}
switch (data.length % 3) {
case 1:
temp <<= 8;
temp <<= 8;
result[resultIndex++] = ENCODE_TABLE[(temp >> 18) & 0x3f];
result[resultIndex++] = ENCODE_TABLE[(temp >> 12) & 0x3f];
result[resultIndex++] = 0x3D;
result[resultIndex++] = 0x3D;
break;
case 2:
temp <<= 8;
result[resultIndex++] = ENCODE_TABLE[(temp >> 18) & 0x3f];
result[resultIndex++] = ENCODE_TABLE[(temp >> 12) & 0x3f];
result[resultIndex++] = ENCODE_TABLE[(temp >> 6) & 0x3f];
result[resultIndex++] = 0x3D;
break;
default:
break;
}
return result;
}
/**
* <b>概要：</b>
* base64解密
* @param base64Data
* @return
*/
public static byte[] Base64Decode(byte[] base64Data) {
if (base64Data == null)
return null;
if (base64Data.length == 0)
return new byte[0];
if (base64Data.length % 4 != 0)
throw new IllegalArgumentException("数据不完整，长度为： " + base64Data.length);
byte[] result = null;
int groupCount = base64Data.length / 4;
int lastData = base64Data.length;
while (base64Data[lastData - 1] == 0x3D) {
if (--lastData == 0)
return new byte[0];
}
result = new byte[lastData - groupCount];
int temp = 0;
int resultIndex = 0;
int dataIndex = 0;
for (; dataIndex + 4 < base64Data.length;) {
temp = DECODE_TABLE[base64Data[dataIndex++]];
temp = (temp << 6) + DECODE_TABLE[base64Data[dataIndex++]];
temp = (temp << 6) + DECODE_TABLE[base64Data[dataIndex++]];
temp = (temp << 6) + DECODE_TABLE[base64Data[dataIndex++]];
result[resultIndex++] = (byte) ((temp >> 16) & 0xff);
result[resultIndex++] = (byte) ((temp >> 8) & 0xff);
result[resultIndex++] = (byte) (temp & 0xff);
}
temp = 0;
int j = 0;
for (; dataIndex < base64Data.length; dataIndex++, j++)
temp = (temp << 6) + DECODE_TABLE[base64Data[dataIndex]];
for (; j < 4; j++)
temp <<= 6;
result[resultIndex++] = (byte) ((temp >> 16) & 0xff);
if (base64Data[dataIndex - 2] != '=')
result[resultIndex++] = (byte) ((temp >> 8) & 0xff);
if (base64Data[dataIndex - 1] != '=')
result[resultIndex++] = (byte) (temp & 0xff);
return result;
}
/*===================================BASE64 部分===========================================*/
/*========================================================================================*/
/*========================================================================================*/
/*===================================MD5 部分==============================================*/
private final static String[] hexDigits = {
"0", "1", "2", "3", "4", "5", "6", "7",
"8", "9", "A", "B", "C", "D", "E", "F"};
/**
* 转换字节数组为16进制字串
* @param b 字节数组
* @return 16进制字串
*/
public static String byteArrayToHexString(byte[] b) {
StringBuffer resultSb = new StringBuffer();
for (int i = 0; i < b.length; i++) {
resultSb.append(byteToHexString(b[i]));
}
return resultSb.toString();
}
/**
* 转换字节数组为16进制字符串
* @param b
* @return
*/
private static String byteToHexString(byte b) {
int n = b;
if (n < 0)
n = 256 + n;
int d1 = n / 16;
int d2 = n % 16;
return hexDigits[d1] + hexDigits[d2];
}
/**
* <b>概要：</b>
* MD5 摘要计算
* TODO 每个参数，返回值注明含义
* @param src
* @return
* @throws Exception
*/
public static byte[] md5Digest(byte[] src) throws Exception {
java.security.MessageDigest alg = java.security.MessageDigest
.getInstance("MD5"); // MD5 is 16 bit message digest
return alg.digest(src);
}
/**
* <b>概要：</b>
* MD5 摘要计算
* @param src
* @return
* @throws Exception
*/
public static String md5Digest(String src) throws Exception {
return byteArrayToHexString(md5Digest((src.getBytes("UTF-8"))));
}
/*===================================MD5 部分==============================================*/
/*========================================================================================*/
/*========================================================================================*/
/*===================================SHA1 部分==============================================*/
/**
* 实现SHA-1消息摘要
* @param inStr
* @return 成功，返回摘要，失败，返回null
*/
public static String sha1(String inStr) {
String outStr = null;
try {
outStr = EncryptUtil.digest(inStr.getBytes("UTF-8"), "SHA-1");
} catch (UnsupportedEncodingException e) {
} catch (Exception e) {
}
return outStr;
}
/**
* 实现SHA-256消息摘要
* @param inStr
* @return 成功，返回摘要，失败，返回null
*/
public static String sha256(String inStr) {
String outStr = null;
try {
outStr = EncryptUtil.digest(inStr.getBytes("UTF-8"), "SHA-256");
} catch (UnsupportedEncodingException e) {
} catch (Exception e) {
}
return outStr;
}
public static String digest(byte[] inputBytes, String algorithm) {
String outputStr = null;
try {
MessageDigest alg = MessageDigest.getInstance(algorithm);
alg.update(inputBytes);
byte[] digest = alg.digest();
outputStr = byte2hex(digest);
} catch (NoSuchAlgorithmException ex) {
}
return outputStr;
}
/**
* 二进制转十六进制字符串。每一个字节转为两位十六进制字符串。
*/
public static String byte2hex(byte[] b) {
String hs = "";
String stmp = "";
for (int i = 0; i < b.length; i++) {
stmp = Integer.toHexString(b[i] & 0XFF);
if (stmp.length() == 1) {
hs = hs + "0" + stmp;
} else {
hs = hs + stmp;
}
}
return hs.toUpperCase();
}
/*===================================SHA1 部分==============================================*/
/*========================================================================================*/
/*========================================================================================*/
/*===================================3DES 部分=============================================*/
private static final String CRYPT_ALGORITHM = "DESede";
/**
* 3DES加密模式
*/
public static String encrypt(String value,String key) {
try {
SecretKeySpec keySpec = new SecretKeySpec(key.getBytes(), CRYPT_ALGORITHM);
Cipher cipher = Cipher.getInstance(CRYPT_ALGORITHM);
cipher.init(Cipher.ENCRYPT_MODE, keySpec);
byte[] encryptedByte = cipher.doFinal(value.getBytes());
String encodedByte = byte2hex(encryptedByte);
return encodedByte;
} catch(Exception e) {
e.printStackTrace();
return null;
}
}
/**
* <b>概要：</b>
* 3DES解密
* @param value
* @param key
* @return
*/
public static String decrypt(String value,String key) {
try {
SecretKeySpec keySpec = new SecretKeySpec(key.getBytes(), CRYPT_ALGORITHM);
Cipher cipher = Cipher.getInstance(CRYPT_ALGORITHM);
cipher.init(Cipher.DECRYPT_MODE, keySpec);
byte[] decryptedByte = cipher.doFinal(hex2byte(value));
return new String(decryptedByte);
} catch(Exception e) {
e.printStackTrace();
return null;
}
}
/**
* <b>概要：</b>
* 十六进制转二进制
* @param hex
* @return
* @throws IllegalArgumentException
*/
public static byte[] hex2byte(String hex) throws IllegalArgumentException {
if (hex.length() % 2 != 0) {
throw new IllegalArgumentException();
}
if (hex.startsWith("0x")) {
hex = hex.substring(2);
}
char[] arr = hex.toCharArray();
byte[] b = new byte[hex.length() / 2];
for (int i = 0, j = 0, l = hex.length(); i < l; i++, j++) {
String swap = "" + arr[i++] + arr[i];
int byteint = Integer.parseInt(swap, 16) & 0xFF;
b[j] = new Integer(byteint).byteValue();
}
return b;
}
/*===================================3DES 部分=============================================*/
/*========================================================================================*/
/**
* cookie加密
* @param data 数据
* @param key 指定密匙
* @return 返回编码base64后的结果
*/
public static String encryptBase64(String data, String key) {
String value = EncryptUtil.encrypt(data, key);
return new String(EncryptUtil.Base64Encode(value.getBytes()));
}
/**
* cookie 解密
* @param data 数据
* @param key 指定密匙
* @return 返回解密后的源数据
*/
public static String decryptBase64(String data, String key) {
data = new String(EncryptUtil.Base64Decode(data.getBytes()));
String value = EncryptUtil.decrypt(data, key);
return value;
}
}