android实现视频的加密和解密（使用AES）

2024-02-22 20:08:03 59

java语言进行加密解密速度挺慢的。。一个6MB左右的文件需要10多秒。。。等有空了瞅瞅ffmpeg去。。

MainActivity.java

/**
*视频加密/解密
*
*@authoroldfeel
*
*Createdon:2014-2-17
*/
publicclassMainActivityextendsActivity{
//原文件
privatestaticfinalStringfilePath="/sdcard/DCIM/Camera/VID_20140217_144346.mp4";
//加密后的文件
privatestaticfinalStringoutPath="/sdcard/DCIM/Camera/encrypt.mp4";
//加密再解密后的文件
privatestaticfinalStringinPath="/sdcard/DCIM/Camera/decrypt.mp4";

@Override
protectedvoidonCreate(BundlesavedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ButtonencryptButton=(Button)findViewById(R.id.main_encrypt);
ButtonDecryptButton=(Button)findViewById(R.id.main_decrypt);
encryptButton.setOnClickListener(newOnClickListener(){
@Override
publicvoidonClick(Viewv){
try{
encrypt();
Toast.makeText(getApplicationContext(),"加密完成",
Toast.LENGTH_SHORT).show();
}catch(InvalidKeyExceptione){
e.printStackTrace();
}catch(NoSuchAlgorithmExceptione){
e.printStackTrace();
}catch(NoSuchPaddingExceptione){
e.printStackTrace();
}catch(IOExceptione){
e.printStackTrace();
}
}
});

DecryptButton.setOnClickListener(newOnClickListener(){
@Override
publicvoidonClick(Viewv){
try{
decrypt();
Toast.makeText(getApplicationContext(),"解密完成",
Toast.LENGTH_SHORT).show();
}catch(InvalidKeyExceptione){
e.printStackTrace();
}catch(NoSuchAlgorithmExceptione){
e.printStackTrace();
}catch(NoSuchPaddingExceptione){
e.printStackTrace();
}catch(IOExceptione){
e.printStackTrace();
}
}
});
}

/**
*HereisBothfunctionforencryptanddecryptfileinSdcardfolder.we
*cannotlockfolderbutwecanencryptfileusingAESinAndroid,itmay
*helpyou.
*
*@throwsIOException
*@throwsNoSuchAlgorithmException
*@throwsNoSuchPaddingException
*@throwsInvalidKeyException
*/

staticvoidencrypt()throwsIOException,NoSuchAlgorithmException,
NoSuchPaddingException,InvalidKeyException{
//Hereyoureadthecleartext.
FileInputStreamfis=newFileInputStream(filePath);
//Thisstreamwritetheencryptedtext.Thisstreamwillbewrappedby
//anotherstream.
FileOutputStreamfos=newFileOutputStream(outPath);
//Lengthis16byte
SecretKeySpecsks=newSecretKeySpec("MyDifficultPassw".getBytes(),
"AES");
//Createcipher
Ciphercipher=Cipher.getInstance("AES");
cipher.init(Cipher.ENCRYPT_MODE,sks);
//Wraptheoutputstream
CipherOutputStreamcos=newCipherOutputStream(fos,cipher);
//Writebytes
intb;
byte[]d=newbyte[8];
while((b=fis.read(d))!=-1){
cos.write(d,0,b);
}
//Flushandclosestreams.
cos.flush();
cos.close();
fis.close();
}

staticvoiddecrypt()throwsIOException,NoSuchAlgorithmException,
NoSuchPaddingException,InvalidKeyException{
FileInputStreamfis=newFileInputStream(outPath);
FileOutputStreamfos=newFileOutputStream(inPath);
SecretKeySpecsks=newSecretKeySpec("oldfeelwasverynb".getBytes(),
"AES");
Ciphercipher=Cipher.getInstance("AES");
cipher.init(Cipher.DECRYPT_MODE,sks);
CipherInputStreamcis=newCipherInputStream(fis,cipher);
intb;
byte[]d=newbyte[8];
while((b=cis.read(d))!=-1){
fos.write(d,0,b);
}
fos.flush();
fos.close();
cis.close();
}

}

activity_main.xml

AndroidManifest.xml要添加读取sd的权限

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android实现视频的加密和解密（使用AES）

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