RSA加密Socket传输资料、签名（三）

2012-12-20

RSA加密Socket传输文件、签名（三）接下来是客户端类CoderClient的编写。1.首先配置如下信息，包括服务器地址、

RSA加密Socket传输文件、签名（三）

接下来是客户端类CoderClient的编写。

1.首先配置如下信息，包括服务器地址、端口、密钥文件位置.

conf.properties

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#configure?private?key?on?server??rsa_private=d:/rsa1_private.key??
#public?key?from?client??rsa_public=d:/rsa_public.key??
#server??server=127.0.0.1??
#server?port??port=888??

2.编写发送文件的方法,其中byte[] buf=new byte[117]的原因是RSA加密算法支持的最大字节数为117，而加密后变成128位，所以服务器端解密的时候可以使用128bytes的buf读取文件。

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public?boolean?send(String?filename){??????????try?{??
????????????File?f?=?new?File(filename);??????????????fis?=?new?FileInputStream(filename);??
????????????byte[]?buf?=?new?byte[117];??????????????int?available;??
????????????socket?=?new?Socket(server,port);??????????????os?=?socket.getOutputStream();??
????????????DataOutputStream?dos?=?new?DataOutputStream(os);??????????????dos.writeUTF(f.getName());?//写入文件名 ??
????????????dos.writeLong(f.length());?//写入文件大小 ??????????????while((available?=?fis.read(buf))?!=?-1){??
????????????????byte[]?availableBytes?=?null;??????????????????if(available?==?buf.length){??
????????????????????availableBytes?=?buf;??????????????????}else{??
????????????????????availableBytes?=?new?byte[available];??????????????????????for?(int?i?=?0;?i?<?available;?i++)?{??
????????????????????????availableBytes[i]?=?(byte)?buf[i];??????????????????????}??
????????????????}??????????????????byte[]?cipherText?=?coder.encrypt(availableBytes);??
????????????????byte[]?signature?=?sign.getSignature(cipherText);??????????????????os.write(signature);??
????????????????os.write(cipherText);??????????????????//count?+=?cipherText.length; ??
????????????????//System.out.println("send?"+count+"?bytes"); ??????????????}??
????????????socket.shutdownOutput();??????????????fis.close();??
????????????return?true;??????????}?catch?(FileNotFoundException?e)?{??
????????????log.error("文件"+filename+"?未找到");??????????}?catch?(UnknownHostException?e)?{??
????????????log.error("未知主机:"+server);??????????}?catch?(IOException?e)?{??
????????????log.error("文件读/写错误，可能是因为远程主机无响应");??????????}??
????????return?false;??????}??

3.为了测试多线程处理效果，可以将客户端继承于Thread，在重写的run方法中调用 send(String file)方法

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@Override??????public?void?run()?{??
????????send(this.file);??????}??

4.main中的测试可以这样来模拟多个客户端同时向服务器传输文件

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File?dir?=?new?File("E://files//demo//");??????????File[]?files?=?dir.listFiles();??
??????????????????for(int?i=0;?i<files.length;?i++){??
????????????Thread?th?=?new?Thread(new?CoderClient(files[i].getAbsolutePath()));??????????????th.start();??
????????}??

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RSA加密Socket传输资料、签名（三）