Android、web中的图片和语音的加密

代码如下：

        /**
	 * 根据参数生成KEY
	 */
	public String getKey(String strKey) {
		try {
			byte[] keyByte = strKey.getBytes();
			// 创建一个空的八位数组,默认情况下为0
			byte[] byteTemp = new byte[8];
			// 将用户指定的规则转换成八位数组
			for (int i = 0; i < byteTemp.length && i < keyByte.length; i++) {
				byteTemp[i] = keyByte[i];
			}
			return  new SecretKeySpec(byteTemp, "DES");
		} catch (Exception e) {
			throw new RuntimeException(
					"Error initializing SqlMap class. Cause: " + e);
		}
	}

<span style="white-space:pre">	</span>// 加密文件
<span style="white-space:pre">	</span>public void encrypt(String file, String destFile) throws Exception {
		Cipher cipher = Cipher.getInstance("DES");
		// cipher.init(Cipher.ENCRYPT_MODE, getKey());
		cipher.init(Cipher.ENCRYPT_MODE, this.key);
		InputStream is = new FileInputStream(file);
		OutputStream out = new FileOutputStream(destFile);
		CipherInputStream cis = new CipherInputStream(is, cipher);
		byte[] buffer = new byte[1024];
		int r;
		while ((r = cis.read(buffer)) > 0) {
			out.write(buffer, 0, r);
		}
		cis.close();
		is.close();
		out.close();
		File img2 = new File(file);
		CommUtil.delete(img2);
	}

<span style="white-space:pre">	</span>// 解密文件，此为Android端的，web端加密手段也一样

<pre name="code" class="java"><span style="white-space:pre">	</span>public Bitmap decrypt(String file, String dest) throws Exception {
		Bitmap bitmapOriginal = null;
		Cipher cipher = Cipher.getInstance("DES");
		cipher.init(Cipher.DECRYPT_MODE, this.key);
		InputStream is = new FileInputStream(file);
		OutputStream out = new FileOutputStream(dest);
		CipherOutputStream cos = new CipherOutputStream(out, cipher);
		byte[] buffer = new byte[1024];
		int r;
		while ((r = is.read(buffer)) >= 0) {
			cos.write(buffer, 0, r);
		}
		cos.close();
		out.close();
		is.close();
		InputStream openis = new FileInputStream(dest);
		bitmapOriginal = BitmapFactory.decodeStream(openis);
		openis.close();
		File img2 = new File(dest);
		CommUtil.delete(img2);
		return bitmapOriginal;

	}

strKey就被发送至客户端。有些文件操作方式不需要和服务器一致的，这些strkey可以使用jni的方式写在c代码中。