jniencryptor.cpp

用AES 加解密文件,内容包括一个测试EXE,和加解密模块D

#include "stdafx.h"
#include "JNIEncryptor.h"
#include "FileCodec.h"


//将Java的Unicode字符串转化成本地字符数组;   
char* JStringToString(JNIEnv* env, jstring jstr)
{
	int length = env->GetStringLength(jstr);
	const jchar* jcstr = env->GetStringChars(jstr,0);
	char* retn = (char*)malloc(length * 2 + 1);
	ZeroMemory(retn,sizeof(retn));

	int size = 0;
	size = WideCharToMultiByte(CP_ACP, 0,(LPCWSTR)jcstr, length, retn,(length * 2 + 1),NULL,NULL);
	if(size <= 0)
	  return NULL;

	env->ReleaseStringChars(jstr,jcstr);
	return retn;   
}   
    

//将本地字符数组转化成Java的Unicode字符串
jstring StringToJString(JNIEnv* env, char* str)
{
	jstring retn = 0;
	int  slen = strlen(str);
	if(slen == 0)
	  retn = env->NewStringUTF(str);
	else
	{
		int length = MultiByteToWideChar(CP_ACP,0,(LPCSTR)str,slen,NULL,0);
		wchar_t*  buffer = (wchar_t*)malloc(length * 2 + 1);
		ZeroMemory(buffer,sizeof(buffer));
		if(MultiByteToWideChar(CP_ACP, 0,(LPCSTR)str,slen,(LPWSTR)buffer,length)>0)
		retn = env->NewString((jchar*)buffer,length);
		free(buffer);
	}   
	return retn;   
}


/*
 * Class:     JNIEncryptor
 * Method:    EncryptFolder
 * Signature: (Ljava/lang/String;)V
 */
JNIEXPORT jboolean JNICALL Java_JNIEncryptor_EncryptFolder
  (JNIEnv* env, jclass clazz, jstring key, jstring strDir, jstring strFileType)
{
	CFileCodec fc;
	char* chKey , *chDir, *chFileType;
	BOOL retn; 
	CString errMsg;

	chKey = JStringToString(env,key);
	chDir = JStringToString(env,strDir);
	chFileType = JStringToString(env,strFileType);

	retn = fc.EncDir(chKey,chDir,chFileType, errMsg);

	free(chKey);
	free(chDir);
	free(chFileType);

	return retn;
}

/*
 * Class:     JNIEncryptor
 * Method:    DecryptFolder
 * Signature: (Ljava/lang/String;)V
 */
JNIEXPORT jboolean JNICALL Java_JNIEncryptor_DecryptFolder
  (JNIEnv* env, jclass clazz, jstring key, jstring strDir, jstring strFileType)
{
	CFileCodec fc;
	char* chKey , *chDir, *chFileType;
	BOOL retn; 
	CString errMsg;

	chKey = JStringToString(env,key);
	chDir = JStringToString(env,strDir);
	chFileType = JStringToString(env,strFileType);

	retn = fc.DecDir(chKey,chDir,chFileType, errMsg);

	free(chKey);
	free(chDir);
	free(chFileType);

	return retn;
}