加密解密組件java

『壹』 如何用java實現文件（不只是txt文本）的整體加密解密

importjava.io.File;
importjava.io.FileInputStream;
importjava.io.FileOutputStream;
importjava.io.InputStream;
importjava.io.OutputStream;
importjava.security.KeyPair;
importjava.security.KeyPairGenerator;
importjava.security.NoSuchAlgorithmException;
importjava.security.interfaces.RSAPrivateKey;
importjava.security.interfaces.RSAPublicKey;
importjavax.crypto.Cipher;

/**
*文件加密解密
*加解密需要依靠以下四個屬性，
	;
	staticKeyPairkeyPair;
	staticRSAPrivateKeyprivateKey;
	staticRSAPublicKeypublicKey;
*@authoryoung
*
*/
publicclassRSAEncrypt{

	;

	staticKeyPairkeyPair;

	staticRSAPrivateKeyprivateKey;

	staticRSAPublicKeypublicKey;

	static{
		try{
			//實例類型
			keyPairGen=KeyPairGenerator.getInstance("RSA");
			//初始化長度
			keyPairGen.initialize(512);
			//聲場KeyPair
			keyPair=keyPairGen.generateKeyPair();
			//Generatekeys
			privateKey=(RSAPrivateKey)keyPair.getPrivate();
			publicKey=(RSAPublicKey)keyPair.getPublic();
		}catch(NoSuchAlgorithmExceptione){
			//TODOAuto-generatedcatchblock
			e.printStackTrace();
		}
	}

	publicstaticvoidmain(String[]args){
		RSAEncryptencrypt=newRSAEncrypt();
		Filefile=newFile(
				"C:\DocumentsandSettings\Administrator.DCB5E0D91E0D436\桌面\sdf.txt");
		FilenewFile=newFile(
				"C:\DocumentsandSettings\Administrator.DCB5E0D91E0D436\桌面\sdf1.txt");
		encrypt.encryptFile(encrypt,file,newFile);
		Filefile1=newFile(
				"C:\DocumentsandSettings\Administrator.DCB5E0D91E0D436\桌面\sdf1.txt");
		FilenewFile1=newFile(
				"C:\DocumentsandSettings\Administrator.DCB5E0D91E0D436\桌面\sdf2.txt");
		encrypt.decryptFile(encrypt,file1,newFile1);
	}

	/**
	*加密文件
	*@paramencryptRSAEncrypt對象
	*@paramfile源文件
	*@paramnewFile目標文件
	*/
	publicvoidencryptFile(RSAEncryptencrypt,Filefile,FilenewFile){
		try{
			InputStreamis=newFileInputStream(file);
			OutputStreamos=newFileOutputStream(newFile);

			byte[]bytes=newbyte[53];
			while(is.read(bytes)>0){
				byte[]e=encrypt.encrypt(RSAEncrypt.publicKey,bytes);
				bytes=newbyte[53];
				os.write(e,0,e.length);
			}
			os.close();
			is.close();
			System.out.println("writesuccess");
		}catch(Exceptione){
			e.printStackTrace();
		}
	}

	/**
	*解密文件
	*@paramencryptRSAEncrypt對象
	*@paramfile
	*@paramnewFile
	*/
	publicvoiddecryptFile(RSAEncryptencrypt,Filefile,FilenewFile){
		try{
			InputStreamis=newFileInputStream(file);
			OutputStreamos=newFileOutputStream(newFile);
			byte[]bytes1=newbyte[64];
			while(is.read(bytes1)>0){
				byte[]de=encrypt.decrypt(RSAEncrypt.privateKey,bytes1);
				bytes1=newbyte[64];
				os.write(de,0,de.length);
			}
			os.close();
			is.close();
			System.out.println("writesuccess");

		}catch(Exceptione){
			e.printStackTrace();
		}
	}

	/**
	*加密實現
	**EncryptString.*
	*
	*@returnbyte[]加密後的位元組數組
	*/
	protectedbyte[]encrypt(RSAPublicKeypublicKey,byte[]obj){
		if(publicKey!=null){
			try{
				Ciphercipher=Cipher.getInstance("RSA");
				cipher.init(Cipher.ENCRYPT_MODE,publicKey);
				returncipher.doFinal(obj);
			}catch(Exceptione){
				e.printStackTrace();
			}
		}
		returnnull;
	}

	/**
	*解密實現
	**Basicdecryptmethod*
	*
	*@returnbyte[]解密後的位元組數組
	*/
	protectedbyte[]decrypt(RSAPrivateKeyprivateKey,byte[]obj){
		if(privateKey!=null){
			try{
				Ciphercipher=Cipher.getInstance("RSA");
				cipher.init(Cipher.DECRYPT_MODE,privateKey);
				returncipher.doFinal(obj);
			}catch(Exceptione){
				e.printStackTrace();
			}
		}
		returnnull;
	}
}

『貳』 java實現ase加密解密

這個演算法java SDK自帶的額 參考代碼如下：

/**解密

*@paramcontent待解密內容

*@parampassword解密密鑰

*@return

*/

publicstaticbyte[]decrypt(byte[]content,Stringpassword){

try{

KeyGeneratorkgen=KeyGenerator.getInstance("AES");

kgen.init(128,newSecureRandom(password.getBytes()));

SecretKeysecretKey=kgen.generateKey();

byte[]enCodeFormat=secretKey.getEncoded();

SecretKeySpeckey=newSecretKeySpec(enCodeFormat,"AES");

Ciphercipher=Cipher.getInstance("AES");//創建密碼器

cipher.init(Cipher.DECRYPT_MODE,key);//初始化

byte[]result=cipher.doFinal(content);

returnresult;//加密

}catch(NoSuchAlgorithmExceptione){

e.printStackTrace();

}catch(NoSuchPaddingExceptione){

e.printStackTrace();

}catch(InvalidKeyExceptione){

e.printStackTrace();

}catch(IllegalBlockSizeExceptione){

e.printStackTrace();

}catch(BadPaddingExceptione){

e.printStackTrace();

}

returnnull;

}

/**

*加密

*

*@paramcontent需要加密的內容

*@parampassword加密密碼

*@return

*/

publicstaticbyte[]encrypt(Stringcontent,Stringpassword){

try{

KeyGeneratorkgen=KeyGenerator.getInstance("AES");

kgen.init(128,newSecureRandom(password.getBytes()));

SecretKeysecretKey=kgen.generateKey();

byte[]enCodeFormat=secretKey.getEncoded();

SecretKeySpeckey=newSecretKeySpec(enCodeFormat,"AES");

Ciphercipher=Cipher.getInstance("AES");//創建密碼器

byte[]byteContent=content.getBytes("utf-8");

cipher.init(Cipher.ENCRYPT_MODE,key);//初始化

byte[]result=cipher.doFinal(byteContent);

returnresult;//加密

}catch(NoSuchAlgorithmExceptione){

e.printStackTrace();

}catch(NoSuchPaddingExceptione){

e.printStackTrace();

}catch(InvalidKeyExceptione){

e.printStackTrace();

}catch(UnsupportedEncodingExceptione){

e.printStackTrace();

}catch(IllegalBlockSizeExceptione){

e.printStackTrace();

}catch(BadPaddingExceptione){

e.printStackTrace();

}

returnnull;

}

http://blog.csdn.net/hbcui1984/article/details/5201247
圖像界面的話就不說了