加密重大错误
Tonyz Java AES Encryptor
使用 Java SecureRandom
通过随机 IV 生成
实现快速加密/解密
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.security.spec.AlgorithmParameterSpec;
import javax.crypto.Cipher;
import javax.crypto.CipherOutputStream;
import javax.crypto.KeyGenerator;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKey;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
public class Encrypter {
private final static int IV_LENGTH = 16; // Default length with Default 128
// key AES encryption
private final static int DEFAULT_READ_WRITE_BLOCK_BUFFER_SIZE = 1024;
private final static String ALGO_RANDOM_NUM_GENERATOR = "SHA1PRNG";
private final static String ALGO_SECRET_KEY_GENERATOR = "AES";
private final static String ALGO_VIDEO_ENCRYPTOR = "AES/CBC/PKCS5Padding";
@SuppressWarnings("resource")
public static void encrypt(SecretKey key, /*AlgorithmParameterSpec paramSpec,*/ InputStream in, OutputStream out)
throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException,
InvalidAlgorithmParameterException, IOException {
try {
// byte[] iv = new byte[] { (byte) 0x8E, 0x12, 0x39, (byte) 0x9C,
// 0x07, 0x72, 0x6F, 0x5A, (byte) 0x8E, 0x12, 0x39, (byte) 0x9C,
// 0x07, 0x72, 0x6F, 0x5A };
//generate new AlgorithmParameterSpec
// AlgorithmParameterSpec paramSpec = new IvParameterSpec(iv);
Cipher c = Cipher.getInstance(ALGO_VIDEO_ENCRYPTOR);
c.init(Cipher.ENCRYPT_MODE, key, paramSpec);
out = new CipherOutputStream(out, c);
int count = 0;
byte[] buffer = new byte[DEFAULT_READ_WRITE_BLOCK_BUFFER_SIZE];
while ((count = in.read(buffer)) >= 0) {
out.write(buffer, 0, count);
}
} finally {
out.close();
}
}
@SuppressWarnings("resource")
public static void decrypt(SecretKey key, /*AlgorithmParameterSpec paramSpec,*/ InputStream in, OutputStream out)
throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException,
InvalidAlgorithmParameterException, IOException {
try {
// byte[] iv = new byte[] { (byte) 0x8E, 0x12, 0x39, (byte) 0x9C,
// 0x07, 0x72, 0x6F, 0x5A, (byte) 0x8E, 0x12, 0x39, (byte) 0x9C,
// 0x07, 0x72, 0x6F, 0x5A };
// read from input stream AlgorithmParameterSpec
// AlgorithmParameterSpec paramSpec = new IvParameterSpec(iv);
Cipher c = Cipher.getInstance(ALGO_VIDEO_ENCRYPTOR);
c.init(Cipher.DECRYPT_MODE, key, paramSpec);
out = new CipherOutputStream(out, c);
int count = 0;
byte[] buffer = new byte[DEFAULT_READ_WRITE_BLOCK_BUFFER_SIZE];
while ((count = in.read(buffer)) >= 0) {
out.write(buffer, 0, count);
}
} finally {
out.close();
}
}
public static void main(String[] args) {
File inFile = new File("C:/enc_test/video.swf");
File outFile = new File("C:/enc_test/enc_video.swf");
File outFile_dec = new File("C:/enc_test/dec_video.swf");
try {
SecretKey key = KeyGenerator.getInstance(ALGO_SECRET_KEY_GENERATOR).generateKey();
byte[] keyData = key.getEncoded();
SecretKey key2 = new SecretKeySpec(keyData, 0, keyData.length, ALGO_SECRET_KEY_GENERATOR); //if you want to store key bytes to db so its just how to //recreate back key from bytes array
byte[] iv = new byte[IV_LENGTH];
SecureRandom.getInstance(ALGO_RANDOM_NUM_GENERATOR).nextBytes(iv); // If
// storing
// separately
AlgorithmParameterSpec paramSpec = new IvParameterSpec(iv);
Encrypter.encrypt(key, paramSpec, new FileInputStream(inFile), new FileOutputStream(outFile));
Encrypter.decrypt(key2, paramSpec, new FileInputStream(outFile), new FileOutputStream(outFile_dec));
} catch (Exception e) {
e.printStackTrace();
}
}
}
感谢Naveem M kumar的建议 http://libeasy.alwaysdata.net/