iOS 抑或算法总结（XOR）

方法1:

／／加密

-(NSString *)obfuscate:(NSData *)string withKey:(NSString *)key

{

NSData *data = string;

char *dataPtr = (char *) [data bytes];

　 char *keyData = (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 = [data characterAtIndex:i];

for(int j=0;j<[key length];j++){

int chKey = [key characterAtIndex:j];

chData = 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 = [[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 = [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 = [NSData dataWithContentsOfFile:file];

return [data xor_encrypt];

}

+ (NSData *)xor_encryptWithString:(NSString *)originString {

NSData *data = [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 = [[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