加密感腳好高大上,直接複制代碼。
public class Constants
{
// 密鑰
public final static String secretKey = "0535YANTAIJIANWANZHONG99";
// 向量
public final static String iv = "12345678";
// 加解密統一使用的編碼方式
public final static String encoding = "utf-8";
// 3des加密
public static final String algorithm = "desede";
}
加密Util
public class EncodeUtil
{
/**
* @param str 需要加密的文字
* @return 加密後的文字
* @throws Exception 加密失敗
*/
public static String get3DES(final String str) throws Exception
{
Key deskey = null;
DESedeKeySpec spec = new DESedeKeySpec(Constants.secretKey.getBytes());
SecretKeyFactory keyfactory = SecretKeyFactory
.getInstance(Constants.algorithm);
deskey = keyfactory.generateSecret(spec);
Cipher cipher = Cipher.getInstance("desede/CBC/PKCS5Padding");
IvParameterSpec ips = new IvParameterSpec(Constants.iv.getBytes());
cipher.init(Cipher.ENCRYPT_MODE, deskey, ips);
byte[] encryptData = cipher.doFinal(str.getBytes(Constants.encoding));
return Base64.encode(encryptData);
}
/**
* 3DES解密
*
* @param encryptText 加密文本
* @return
* @throws Exception
*/
public static String decode3DES(String encryptText) throws Exception {
Key deskey = null;
DESedeKeySpec spec = new DESedeKeySpec(Constants.secretKey.getBytes());
SecretKeyFactory keyfactory = SecretKeyFactory.getInstance(Constants.algorithm);
deskey = keyfactory.generateSecret(spec);
Cipher cipher = Cipher.getInstance("desede/CBC/PKCS5Padding");
IvParameterSpec ips = new IvParameterSpec(Constants.iv.getBytes());
cipher.init(Cipher.DECRYPT_MODE, deskey, ips);
byte[] decryptData = cipher.doFinal(Base64.decode(encryptText));
return new String(decryptData, Constants.encoding);
}
}
加密中還需要一個Base64類
/**
* Base64編碼工具類
*/
public class Base64
{
private static final char[] legalChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
.toCharArray();
public static String encode(byte[] data)
{
int start = ;
int len = data.length;
StringBuffer buf = new StringBuffer(data.length * / );
int end = len - ;
int i = start;
int n = ;
while (i <= end)
{
int d = ((((int) data[i]) & ) << )
| ((((int) data[i + ]) & ) << )
| (((int) data[i + ]) & );
buf.append(legalChars[(d >> ) & ]);
buf.append(legalChars[(d >> ) & ]);
buf.append(legalChars[(d >> ) & ]);
buf.append(legalChars[d & ]);
i += ;
if (n++ >= )
{
n = ;
buf.append(" ");
}
}
if (i == start + len - )
{
int d = ((((int) data[i]) & ) << )
| ((((int) data[i + ]) & ) << );
buf.append(legalChars[(d >> ) & ]);
buf.append(legalChars[(d >> ) & ]);
buf.append(legalChars[(d >> ) & ]);
buf.append("=");
} else if (i == start + len - )
{
int d = (((int) data[i]) & ) << ;
buf.append(legalChars[(d >> ) & ]);
buf.append(legalChars[(d >> ) & ]);
buf.append("==");
}
return buf.toString();
}
private static int decode(char c)
{
if (c >= 'A' && c <= 'Z')
return ((int) c) - ;
else if (c >= 'a' && c <= 'z')
return ((int) c) - + ;
else if (c >= '0' && c <= '9')
return ((int) c) - + + ;
else
switch (c)
{
case '+':
return ;
case '/':
return ;
case '=':
return ;
default:
throw new RuntimeException("unexpected code: " + c);
}
}
/**
* Decodes the given Base64 encoded String to a new byte array. The byte
* array holding the decoded data is returned.
*/
public static byte[] decode(String s)
{
ByteArrayOutputStream bos = new ByteArrayOutputStream();
try
{
decode(s, bos);
} catch (IOException e)
{
throw new RuntimeException();
}
byte[] decodedBytes = bos.toByteArray();
try
{
bos.close();
bos = null;
} catch (IOException ex)
{
System.err.println("Error while decoding BASE64: " + ex.toString());
}
return decodedBytes;
}
private static void decode(String s, OutputStream os) throws IOException
{
int i = ;
int len = s.length();
while (true)
{
while (i < len && s.charAt(i) <= ' ')
i++;
if (i == len)
break;
int tri = (decode(s.charAt(i)) << )
+ (decode(s.charAt(i + )) << )
+ (decode(s.charAt(i + )) << )
+ (decode(s.charAt(i + )));
os.write((tri >> ) & );
if (s.charAt(i + ) == '=')
break;
os.write((tri >> ) & );
if (s.charAt(i + ) == '=')
break;
os.write(tri & );
i += ;
}
}
}