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iOS 抑或算法总结(XOR)
方法1:
//加密
-(NSString *)obfuscate:(NSData *)string withKey:(NSString *)key
{
NSData *data = http://www.mamicode.com/string;
char *dataPtr = (char *) [data bytes];
char *keyData = http://www.mamicode.com/(char *) [[key dataUsingEncoding:NSUTF8StringEncoding] bytes];
char *keyPtr = keyData;
int keyIndex = 0;
for (int x = 0; x < [data length]; x++){
*dataPtr = *dataPtr++ ^ *keyPtr++;
if (++keyIndex == [key length]) keyIndex = 0, keyPtr = keyData;
}
return [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
}
//解密
-(NSString*)encodeString:(NSString*)data :(NSString*)key{
NSString *result=[NSString string];
for(int i=0; i < [data length]; i++){
int chData = http://www.mamicode.com/[data characterAtIndex:i];
for(int j=0;j<[key length];j++){
int chKey = [key characterAtIndex:j];
chData = http://www.mamicode.com/chData^chKey;
}
result=[NSString stringWithFormat:@"%@%@",result,[NSString stringWithFormat:@"%c",chData]];
}
return result;
}
方法2:
// 客户端内置私钥
static NSString const *privateKey = @"ef37c9111210854f5986fc9ebb5548b2ae";
@implementation NSData(XOREncrypt)
- (NSData *)xor_decrypt
{
return [self xor_encrypt];
}
// 加密
- (NSData *)xor_encrypt
{
// 获取key的长度
NSInteger length = privateKey.length;
// 将OC字符串转换为C字符串
const char *keys = [privateKey cStringUsingEncoding:NSASCIIStringEncoding];
unsigned char cKey[length];
memcpy(cKey, keys, length);
// 数据初始化,空间未分配 配合使用 appendBytes
NSMutableData *encryptData = http://www.mamicode.com/[[NSMutableData alloc] initWithCapacity:length];
// 获取字节指针
const Byte *point = self.bytes;
for (int i = 0; i < self.length; i++) {
int l = i % length; // 算出当前位置字节,要和密钥的异或运算的密钥字节
char c = cKey[l];
Byte b = (Byte) ((point[i]) ^ c); // 异或运算
[encryptData appendBytes:&b length:1]; // 追加字节
}
return encryptData.copy;
}
@end
方法3:
#import <Foundation/Foundation.h>
@interface SQHXOREncryptUtil : NSObject
+ (BOOL)xor_encryptWithString:(NSString *)originString toFile:(NSString *)file;
+ (NSData *)xor_encryptWithFilename:(NSString *)filename type:(NSString *)type;
+ (NSData *)xor_encryptWithFile:(NSString *)file;
+ (NSData *)xor_encryptWithString:(NSString *)originString;
@end
@interface NSData(XOREncrypt)
/** 加密 */
- (NSData *)xor_encrypt;
/** 解密 */
- (NSData *)xor_decrypt;
@end
#import "SQHXOREncryptUtil.h"
@implementation SQHXOREncryptUtil
+ (BOOL)xor_encryptWithString:(NSString *)originString toFile:(NSString *)file {
NSData *encryptData = http://www.mamicode.com/[self xor_encryptWithString:originString];
return [encryptData writeToFile:file atomically:YES];
}
+ (NSData *)xor_encryptWithFilename:(NSString *)filename type:(NSString *)type {
NSString *filepath = [[NSBundle mainBundle] pathForResource:filename ofType:type];
return [self xor_encryptWithFile:filepath];
}
+ (NSData *)xor_encryptWithFile:(NSString *)file {
NSData *data = http://www.mamicode.com/[NSData dataWithContentsOfFile:file];
return [data xor_encrypt];
}
+ (NSData *)xor_encryptWithString:(NSString *)originString {
NSData *data = http://www.mamicode.com/[originString dataUsingEncoding:NSUTF8StringEncoding];
return [data xor_encrypt];
}
@end
// 客户端内置私钥
static NSString const *privateKey = @"ef37c9111210854f5986fc9ebb5548b2ae";
@implementation NSData(XOREncrypt)
// 解密
- (NSData *)xor_decrypt {
return [self xor_encrypt];
}
// 加密
- (NSData *)xor_encrypt {
// 获取key的长度
NSInteger length = privateKey.length;
// 将OC字符串转换为C字符串
const char *keys = [privateKey cStringUsingEncoding:NSASCIIStringEncoding];
unsigned char cKey[length];
memcpy(cKey, keys, length);
// 数据初始化,空间未分配 配合使用 appendBytes
NSMutableData *encryptData = http://www.mamicode.com/[[NSMutableData alloc] initWithCapacity:length];
// 获取字节指针
const Byte *point = self.bytes;
for (int i = 0; i < self.length; i++) {
int l = i % length; // 算出当前位置字节,要和密钥的异或运算的密钥字节
char c = cKey[l];
Byte b = (Byte) ((point[i]) ^ c); // 异或运算
[encryptData appendBytes:&b length:1]; // 追加字节
}
return encryptData.copy;
}
@end
iOS 抑或算法总结(XOR)