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| import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.security.Key;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import javax.crypto.Cipher;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESedeKeySpec;
import javax.crypto.spec.IvParameterSpec;
import org.apache.commons.codec.binary.Base64;
import org.apache.commons.codec.binary.Hex;
public class Encrypt {
private static byte keyiv[] = "12345678".getBytes();
public static String generateKeyByMd5(String str) {
String result = "";
try {
MessageDigest messageDigest = MessageDigest.getInstance("md5");
byte[] md5Bytes = messageDigest.digest(str.getBytes());
result = Hex.encodeHexString(md5Bytes);
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
}
return result;
}
public static String encrypt3Des(String str, String key) {
String returnStr = "";
try {
DESedeKeySpec deSedeKeySpec = new DESedeKeySpec(key.getBytes());
SecretKeyFactory factory = SecretKeyFactory.getInstance("DESede");
Key convertSecretKey = factory.generateSecret(deSedeKeySpec);
Cipher cipher = Cipher.getInstance("DESede/CBC/PKCS5Padding");
IvParameterSpec ips = new IvParameterSpec(keyiv);
cipher.init(Cipher.ENCRYPT_MODE, convertSecretKey,ips);
byte[] result = cipher.doFinal(str.getBytes());
returnStr = Base64.encodeBase64String(result);
} catch (Exception e) {
}
return returnStr;
}
public static String decrypt(String str, String key) {
String returnStr = "";
try {
DESedeKeySpec deSedeKeySpec = new DESedeKeySpec(key.getBytes());
SecretKeyFactory factory = SecretKeyFactory.getInstance("DESede");
Key convertSecretKey = factory.generateSecret(deSedeKeySpec);
Cipher cipher = Cipher.getInstance("DESede/CBC/PKCS5Padding");
IvParameterSpec ips = new IvParameterSpec(keyiv);
cipher.init(Cipher.DECRYPT_MODE, convertSecretKey,ips);
byte[] result = cipher.doFinal(Base64.decodeBase64(str.getBytes()));
System.out.println("decrypt : " + new String(result));
returnStr = new String(result, "UTF-8");
} catch (Exception e) {
e.printStackTrace();
}
return returnStr;
}
public static String readFile(String path) throws Exception {
File f = new File(path);
InputStream in = new FileInputStream(f);
byte[] b = new byte[(int) f.length()];
for (int i = 0; i < b.length; i++) {
b[i] = (byte) in.read();
}
in.close();
System.out.println(new String(b));
return new String(b);
}
public static void writeFile(String str,String path){
File f=new File(path);
try{
f.createNewFile();
OutputStream out =new FileOutputStream(f);
byte[] b=str.getBytes();
for (int i = 0; i < b.length; i++) {
out.write(b[i]);
}
out.close();
}catch (Exception e) {
e.printStackTrace();
}
}
public static void main(String[] args) {
String keyStr = "hello world";
String key = generateKeyByMd5(keyStr);
System.out.println("key ：" + key);
try {
String str = readFile("/home/jay/test");
str = encrypt3Des(str, key);
System.out.println("加密后内容：" + str);
writeFile(str,"/home/jay/output");
} catch (Exception e) {
e.printStackTrace();
}
try {
String str = readFile("/home/jay/output");
str = decrypt(str, key);
System.out.println("解密后内容：" + str);
writeFile(str,"/home/jay/output2");
} catch (Exception e) {
e.printStackTrace();
}
}
}
|
