📄 digitalenvelop.java
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package org.infosecurity.cryptography;
/**
* <p>Title: 数字信封类 </p>
* <p>Description: 数字信封类 </p>
* <p>Copyright: Copyright (c) 2003</p>
* <p>Company: 中信信息安全组织(CISO)</p>
* @author 张荣华
* @version 1.0.2003.1028
*/
import org.infosecurity.cryptography.*;
import org.infosecurity.cryptography.*;
import java.io.*;
import java.security.SecureRandom;
public class DigitalEnvelop {
//=========================================================
// 定义错误类型,以有意义的常量代替数字
public final static int S_OK = 1;
/* 成功 */
public final static int S_FILENOTFOUND_ERROR = -1;
/* 文件没找到 */
public final static int S_IO_EXCEPTION = -2;
/* IO异常 */
public final static int S_DATALENGTH_EXCEPTION = -3;
/* RSA公钥加密异常*/
public final static int S_PWD_FILE_ERROR = -4;
/* 不是密码文件 */
//==========================================================
// 定义变量名
CRsa rsa = new CRsa();
FileEncryptor fe = null;
SecureRandom sr = new SecureRandom();
public DigitalEnvelop()
{
}
/**
* 对数据封装
* @param strInFileName 输入文件名
* @param strOutFileName 输出文件名
* @param puk 公钥
* @param strPwdFileName 密码被加密后存贮文件名
* @return 成功 S_OK,失败 其它
*/
public int MakeSeal(String strInFileName, /* 输入文件名 */
String strOutFileName, /* 输出文件名 */
RSAPublicKey puk, /* 公钥 */
String strPwdFileName) /* 密码被加密后存贮文件名 */
{
byte[] pwd = new byte[8];
byte[] iv = new byte[8];
byte[] cipher = null;
FileInputStream fis = null;
FileOutputStream fos = null;
FileOutputStream fosPwd = null;
sr.nextBytes(pwd);
fe = new FileEncryptor(pwd);
try {
fis = new FileInputStream(strInFileName);
}
catch (FileNotFoundException ex) {
return S_FILENOTFOUND_ERROR;
}
try {
fos = new FileOutputStream(strOutFileName);
}
catch (FileNotFoundException ex) {
try {
fis.close();
fos.close();
}
catch (IOException ex1) {}
finally{
return S_FILENOTFOUND_ERROR;
}
}
try {
fosPwd = new FileOutputStream(strPwdFileName);
}
catch (FileNotFoundException ex) {
try {
fosPwd.close();
fis.close();
fos.close();
}
catch (IOException ex1) {}
finally{
return S_FILENOTFOUND_ERROR;
}
}
sr.nextBytes(iv);
try {
fe.EncryptCBC(iv,fis,fos);
}
catch (IOException ex) {
try {
fis.close();
fos.close();
}
catch (IOException ex1) { }
finally
{
return S_IO_EXCEPTION;
}
}
finally
{
try {
fis.close();
fos.close();
}
catch (IOException ex1) {
return S_IO_EXCEPTION;
}
}
rsa.setPublicKey(puk);
try {
cipher = rsa.PublicKeyEncrypt(pwd,8);
}
catch (DataLengthException ex) {
return S_DATALENGTH_EXCEPTION;
}
try {
fosPwd.write(cipher,0,cipher.length);
}
catch (IOException ex) {}
finally
{
try {
fosPwd.close();
}
catch (IOException ex2) {
return S_IO_EXCEPTION;
}
}
return S_OK;
}
/**
* 对数据解封装
* @param strInFileName 输入文件名(密文)
* @param strOutFileName 输出文件名
* @param puk 公钥
* @param strPwdFileName 密码被加密后存贮文件名
* @return 成功 S_OK,失败 其它
*/
public int OpenSeal(String strInFileName, /* 输入文件名 */
String strOutFileName, /* 输出文件名 */
RSAPrivateKey pvk, /* 公钥 */
String strPwdFileName) /* 密码文件的文件名 */
{
byte[] pwd = null;
byte[] cipher = new byte[512];
FileInputStream fis = null;
FileOutputStream fos = null;
FileInputStream fisPwd = null;
int real_length = 0;
int excp = -1;
/* 处理文件的输入/输出异常 */
try {
fis = new FileInputStream(strInFileName);
}
catch (FileNotFoundException ex) {
return S_FILENOTFOUND_ERROR;
}
try {
fos = new FileOutputStream(strOutFileName);
}
catch (FileNotFoundException ex) {
try {
fis.close();
fos.close();
}
catch (IOException ex1) {}
finally{
return S_FILENOTFOUND_ERROR;
}
}
try {
fisPwd = new FileInputStream(strPwdFileName);
}
catch (FileNotFoundException ex) {
try {
fisPwd.close();
fis.close();
fos.close();
}
catch (IOException ex1) {}
finally{
return S_FILENOTFOUND_ERROR;
}
}
/* 读密码 */
try {
real_length = fisPwd.read(cipher);
}
catch (IOException ex) {
excp=1;
}
finally
{
try {
fisPwd.close();
}
catch (IOException ex) {
return S_IO_EXCEPTION;
}
if(excp==1)
return S_IO_EXCEPTION;
}
rsa.setPrivateKey(pvk);
try {
byte [] real_data = new byte[real_length];
System.arraycopy(cipher,0,real_data,0,real_length);
pwd = rsa.PrivateKeyDecrypt(real_data,real_length);
}
catch (DataLengthException ex) {
try {
fis.close();
fos.close();
}
catch (IOException ex1) {}
return S_DATALENGTH_EXCEPTION;
}
if(pwd.length!=8){
try {
fis.close();
fos.close();
}
catch (IOException ex1) {}
return S_PWD_FILE_ERROR;
}
fe = new FileEncryptor(pwd);
try {
fe.DecryptCBC(fis,fos);
}
catch (IOException ex) {
try {
fis.close();
fos.close();
}
catch (IOException ex1) {}
return S_IO_EXCEPTION;
}
finally
{
try {
fis.close();
fos.close();
}
catch (IOException ex1)
{
return S_IO_EXCEPTION;
}
}
return S_OK;
}
/**
* 数字信封测试程序
* @author 张荣华
*
*/
public static void main(String[] args) {
DigitalEnvelop de = new DigitalEnvelop();
// 生成公私钥对
//de.rsa.generateKeyPair(512);
RSAPublicKey puk = null;
RSAPrivateKey pvk = null;
// 读入公私钥
try {
puk=de.rsa.readPuk("E:\\JavaProj\\temp\\puk.key");
pvk=de.rsa.readPvk("E:\\JavaProj\\temp\\pvk.key");
}
catch (Exception ex) {
System.out.println("读公/私钥出现异常!");
}
if(puk==null)
{
System.out.println("puk为空!");
return ;
}
if(pvk==null)
{
System.out.println("pvk为空!");
return ;
}
long time1 = System.currentTimeMillis();
// 数据封装
// de.MakeSeal("E:\\JavaProj\\temp\\plaintext.txt",
// "E:\\JavaProj\\temp\\ciphertext.txt",
// puk,
// "E:\\JavaProj\\temp\\EVPpwd.txt"
// );
// 数据解封装
de.OpenSeal("E:\\JavaProj\\temp\\ciphertext.txt",
"E:\\JavaProj\\temp\\resulttext.txt",
pvk,
"E:\\JavaProj\\temp\\EVPpwd.txt"
);
long dif = System.currentTimeMillis()-time1;
long tm = dif/1000;
long min = tm/60;
long sec = tm%60;
System.out.println("共花费时间:"+dif+"毫秒("+min+"分"+sec+"秒)");
}
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