android使用AES加密和解密文件实例代码
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2020-08-30
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android使用使用AES加密和解密文件实例代码加密和解密文件实例代码
本篇文章主要介绍了android使用AES加密和解密文件实例代码，非常具有实用价值，需要的朋友可以参考下
前言前言
最近公司需要对本公司的一些下载文件进行加密解密需求，也就尝试去实现下，其实需要借助第三方的jar包：bcprov-jdk15on-155.jar，下载这个可以到网上搜或者下载本人的demo即可，注
意：需要加密和解密的key是一致的才可以解密，不然就会解密失败。不多说，直接上代码。
效果图
代码：
实现加密解密逻辑代码
package com.vsoontech.p2p.sample;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.security.InvalidKeyException;
import java.security.Key;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.KeyGenerator;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.ShortBufferException;
/**
* @author zhou
* @since 2016/9/26
*/
public enum AES {
INSTANCE;
private Key key;
/**
* 生成AES对称秘钥
*/
public String generateKey() throws NoSuchAlgorithmException {
KeyGenerator keygen = KeyGenerator.getInstance("AES");
SecureRandom random = new SecureRandom();
keygen.init(random);
this.key = keygen.generateKey();
return "Algorithm Format Encoded:" + key.getAlgorithm() + " - " + key.getFormat() + " - " + new String(key.getEncoded());
}
/**
* 加密
*/
public void encrypt(InputStream in) throws InvalidKeyException, ShortBufferException, IllegalBlockSizeException, BadPaddingException, NoSuchAlgorithmException, NoSuchPaddingException, IOException {
this.crypt(in, null, Cipher.ENCRYPT_MODE);
}
/**
* 解密
*/
public String decrypt(InputStream in) throws InvalidKeyException, ShortBufferException, IllegalBlockSizeException, BadPaddingException, NoSuchAlgorithmException, NoSuchPaddingException, IOException {
return this.crypt(in, Cipher.DECRYPT_MODE);
}
/**
* 加密
*/
public void encrypt(InputStream in, OutputStream out) throws InvalidKeyException, ShortBufferException, IllegalBlockSizeException, BadPaddingException, NoSuchAlgorithmException, NoSuchPaddingException, IOException {
this.crypt(in, out, Cipher.ENCRYPT_MODE);
}
/**
* 解密
*/
public void decrypt(InputStream in, OutputStream out) throws InvalidKeyException, ShortBufferException, IllegalBlockSizeException, BadPaddingException, NoSuchAlgorithmException, NoSuchPaddingException, IOException {
this.crypt(in, out, Cipher.DECRYPT_MODE);
}
/**
* 实际的加密解密过程
*/
public void crypt(InputStream in, OutputStream out, int mode) throws IOException, ShortBufferException, IllegalBlockSizeException, BadPaddingException, NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException {
Cipher cipher = Cipher.getInstance("AES");
cipher.init(mode, this.key);
int blockSize = cipher.getBlockSize();
int outputSize = cipher.getOutputSize(blockSize);
byte[] inBytes = new byte[blockSize];
byte[] outBytes = new byte[outputSize];
int inLength = 0;
boolean more = true;
while (more) {
inLength = in.read(inBytes);
if (inLength == blockSize) { //只要输入数据块具有全长度（长度可被8整除），调用update方法
int outLength = cipher.update(inBytes, 0, blockSize, outBytes);
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