OC 数据异或加密解密工具

@interface ZYBXOREncryptUtil : NSObject +(ZYBXOREncryptUtil * )shareInstance; //加密 -(NSString *)xor_encrypWithString:(NSString *)str;

//解密 -(NSString *)xor_decryptWithString:(NSString *)str;

@end

@interface NSData(XOREncrypt) /** 加密 */

• (NSString *)xor_encrypt;

/** 解密 */

• (NSString *)xor_decrypt;

@end

@implementation ZYBXOREncryptUtil static ZYBXOREncryptUtil *shareInstance =nil; +(ZYBXOREncryptUtil *)shareInstance { static dispatch_once_t once; dispatch_once(&once, ^{ shareInstance =[[self alloc]init]; }); return shareInstance; } //当使用alloc的时候回调用这个方法 （保证唯一性） +(instancetype)allocWithZone:(struct _NSZone *)zone { if(shareInstance==nil) { static dispatch_once_t once; dispatch_once(&once, ^{ shareInstance=[super allocWithZone:zone]; }); } return shareInstance; } //加密 -(NSString *)xor_encrypWithString:(NSString *)str { NSData *data = [str dataUsingEncoding:NSUTF8StringEncoding];

return [data xor_encrypt]; } //解密 -(NSString *)xor_decryptWithString:(NSString *)str { NSData *data = [str dataUsingEncoding:NSUTF8StringEncoding];

return [data xor_decrypt]; } @end //秘钥 static NSString const *PWD_MOBILE_V1 = @"UYWIWEHIUHCNOWEA23F3ASD98ASDNLK0230NSDLKCFN20";

@implementation NSData(XOREncrypt)

//解密

• (NSString *)xor_decrypt { return [self xor_encrypt]; }

//加密 -(NSString *)xor_encrypt { // 获取key的长度 NSInteger length = PWD_MOBILE_V1.length;

// 将OC字符串转换为C字符串 const char *keys = [PWD_MOBILE_V1 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]; } return [[NSString alloc]initWithData:encryptData.copy encoding:NSUTF8StringEncoding]; }

@end