iOS里加密字符串、图片、视频方法
iOS里加密字符串、图片、视频方法
1、使用GTMBase64编码解码字符串
GTMDefines.h GTMBase64.h GTMBase64.m
你可以在这里找到这三个文件（GTMDefines.h在第二页，点击右上角的next按钮即可跳转到第二页）http://code.google.com/p/google-toolbox-for-mac/source/browse/trunk/Foundation/?r=87
2、编解码函数（可以编解码字符串、图片、视频：filePath换成相应的即可）：
从模拟器和真机的Documents路径下读取文件，编码后写入文件；读出来解码
// 加密函数
-(void)func_encodeFile
{
//NSString *path = [NSHomeDirectory() stringByAppendingFormat:@"/Documents/test.png"];
NSString *filePath = [NSHomeDirectory() stringByAppendingFormat:@"/Documents/iphone4.mov"];
//文件路径转换为NSData
NSData *imageDataOrigin = [NSData dataWithContentsOfFile:filePath];
// 对前1000位进行异或处理
unsigned char * cByte = (unsigned char*)[imageDataOrigin bytes];
for (int index = 0; (index < [imageDataOrigin length]) && (index < 1000); index++, cByte++)
{
*cByte = (*cByte) ^ arrayForEncode[index];
}
//对NSData进行base64编码
NSData *imageDataEncode = [GTMBase64 encodeData:imageDataOrigin];
[imageDataEncode writeToFile:filePath atomically:YES];
}
// 解密函数
-(void)func_decodeFile
{
//NSString *filePath = [NSHomeDirectory() stringByAppendingFormat:@"/Documents/test.png"];
NSString *filePath = [NSHomeDirectory() stringByAppendingFormat:@"/Documents/iphone4.mov"];
// 读取被加密文件对应的数据
NSData *dataEncoded = [NSData dataWithContentsOfFile:filePath];
// 对NSData进行base64解码
NSData *dataDecode = [GTMBase64 decodeData:dataEncoded];
// 对前1000位进行异或处理
unsigned char * cByte = (unsigned char*)[dataDecode bytes];
for (int index = 0; (index < [dataDecode length]) && (index < 1000); index++, cByte++)
{
*cByte = (*cByte) ^ arrayForEncode[index];
}
[dataDecode writeToFile:filePath atomically:YES];
}
下面是根据上面2中的代码实现成功而来:
#define Key_Count (10)//加密字符串长度,上文2中设置1000,此处便于理解测试设置为10
static char arrayForEncode[Key_Count] = "2014.Year+";
-(BOOL)func_encodeFile:(NSString *)filePath withNewName:(NSString*)newFilePath
{
if (nil == filePath || NO == [[NSFileManager defaultManager] fileExistsAtPath:filePath])
{
return NO;
}
//文件路径转换为NSData
NSData *imageDataOrigin = [NSData dataWithContentsOfFile:filePath];
// 对前1000位进行异或处理
unsigned char * cByte = (unsigned char*)[imageDataOrigin bytes];
for (int index = 0; (index < [imageDataOrigin length]) && (index < Key_Count); index++, cByte++)
{
*cByte = (*cByte) ^ arrayForEncode[index];
}
//对NSData进行base64编码
NSData *imageDataEncode = [GTMBase64 encodeData:imageDataOrigin];
return [imageDataEncode writeToFile:newFilePath atomically:YES];
}
-(BOOL)func_decodeFile:(NSString *)filePath withNewName:(NSString*)newFilePath
{
if (nil == filePath || NO == [[NSFileManager defaultManager] fileExistsAtPath:filePath])
{
return NO;
}
// 读取被加密文件对应的数据
NSData *dataEncoded = [NSData dataWithContentsOfFile:filePath];
// 对NSData进行base64解码
NSData *dataDecode = [GTMBase64 decodeData:dataEncoded];
// 对前1000位进行异或处理
unsigned char * cByte = (unsigned char*)[dataDecode bytes];
for (int index = 0; (index < [dataDecode length]) && (index < Key_Count); index++, cByte++)
{
*cByte = (*cByte) ^ arrayForEncode[index];
}
return [dataDecode writeToFile:newFilePath atomically:YES];
}
测试代码段:
NSString *filePath = [NSHomeDirectory() stringByAppendingFormat:@"/Documents/test/1.jpg"];
NSString *filePath1 = [NSHomeDirectory() stringByAppendingFormat:@"/Documents/test/11.jpg"];
NSString *filePath2 = [NSHomeDirectory() stringByAppendingFormat:@"/Documents/test/12.jpg"];
[self func_encodeFile:filePath withNewName:filePath1];
[self func_decodeFile:filePath1 withNewName:filePath2];