iOS 自定义加密算法——加密

十六进制转二进制的时候会用到

self.setSecretDic = [[NSMutableDictionaryalloc]
initWithCapacity:16];

    [self.setSecretDicsetObject:@"0000"forKey:@"0"];

    [self.setSecretDicsetObject:@"0001"forKey:@"1"];

    [self.setSecretDicsetObject:@"0010"forKey:@"2"];

    [self.setSecretDicsetObject:@"0011"forKey:@"3"];

    [self.setSecretDicsetObject:@"0100"forKey:@"4"];

    [self.setSecretDicsetObject:@"0101"forKey:@"5"];

    [self.setSecretDicsetObject:@"0110"forKey:@"6"];

    [self.setSecretDicsetObject:@"0111"forKey:@"7"];

    [self.setSecretDicsetObject:@"1000"forKey:@"8"];

    [self.setSecretDicsetObject:@"1001"forKey:@"9"];

    [self.setSecretDicsetObject:@"1010"forKey:@"a"];

    [self.setSecretDicsetObject:@"1011"forKey:@"b"];

    [self.setSecretDicsetObject:@"1100"forKey:@"c"];

    [self.setSecretDicsetObject:@"1101"forKey:@"d"];

    [self.setSecretDicsetObject:@"1110"forKey:@"e"];

    [self.setSecretDicsetObject:@"1111"forKey:@"f"];

二进制转十六进制的时候会用到

self.removeSecretDic = [[NSMutableDictionary
alloc] initWithCapacity:16];

    [self.removeSecretDic
setObject:@"0"
forKey:@"0000"];

    [self.removeSecretDic
setObject:@"1"
forKey:@"0001"];

    [self.removeSecretDic
setObject:@"2"
forKey:@"0010"];

    [self.removeSecretDic
setObject:@"3"
forKey:@"0011"];

    [self.removeSecretDic
setObject:@"4"
forKey:@"0100"];

    [self.removeSecretDic
setObject:@"5"
forKey:@"0101"];

    [self.removeSecretDic
setObject:@"6"
forKey:@"0110"];

    [self.removeSecretDic
setObject:@"7"
forKey:@"0111"];

    [self.removeSecretDic
setObject:@"8"
forKey:@"1000"];

    [self.removeSecretDic
setObject:@"9"
forKey:@"1001"];

    [self.removeSecretDic
setObject:@"a"
forKey:@"1010"];

    [self.removeSecretDic
setObject:@"b"
forKey:@"1011"];

    [self.removeSecretDic
setObject:@"c"
forKey:@"1100"];

    [self.removeSecretDic
setObject:@"d"
forKey:@"1101"];

    [self.removeSecretDic
setObject:@"e"
forKey:@"1110"];

    [self.removeSecretDic
setObject:@"f"
forKey:@"1111"];

#pragma mark - 加密

- (void)setSecretWithString:(NSString *)string{

    NSData *binaryData = [stringdataUsingEncoding:
NSUTF8StringEncoding];

    Byte *binaryByte = (Byte *)[binaryDatabytes];

    NSString *hexString=@"";

    for(int i=0;i<[binaryDatalength];i++)

    {

        NSString *newHexStr = [NSStringstringWithFormat:@"%x",binaryByte[i]&0xff];

        if([newHexStrlength]==1){

            hexString = [NSStringstringWithFormat:@"%@0%@",hexString,newHexStr];

        }else{

        

            hexString = [NSStringstringWithFormat:@"%@%@",hexString,newHexStr];

        }

    }

    NSLog(@"16进制数为:\n%@",hexString);

    

    [selfhexStringTranslateToBinaryString:hexString];

}

#pragma mark - 将十六进制转化为二进制

- (void)hexStringTranslateToBinaryString:(NSString *)hexString{

    

    NSString *binaryString=[[NSStringalloc]
init];

    

    for (int i =0; i < [hexString
length]; i++) {

        

        NSRange rage;

        

        rage.length =1;

        rage.location = i;

        NSString *key = [hexStringsubstringWithRange:rage];

        binaryString = [NSStringstringWithFormat:@"%@%@",binaryString,[NSStringstringWithFormat:@"%@",[self.setSecretDicobjectForKey:key]]];

        

    }

    

    NSLog(@"转化后的二进制为:\n%@",binaryString);

    

    [selfchangeBinaryString:binaryString];

}

#pragma mark - 移位(改变二进制数的某一个或某几个位)

- (void)changeBinaryString:(NSString *)binaryString{

    NSMutableArray *binaryArray = [[NSMutableArrayalloc]
init];

    for (int i=0; i<[binaryStringlength];
i++) {

        

        NSRange rage;

        rage.length =1;

        rage.location = i;

        NSString *character = [binaryStringsubstringWithRange:rage];

        [binaryArray addObject:character];

    }

    

    [binaryArray exchangeObjectAtIndex:0withObjectAtIndex:binaryArray.count-1];

    

    NSString *newBinaryString =@"";

    for (NSInteger i =0; i < binaryArray.count;
i++) {

        

        newBinaryString = [newBinaryString stringByAppendingFormat:@"%@",[binaryArrayobjectAtIndex:i]];

    }

    

    //newBinaryString就是移位后的数据

    NSLog(@"移位后的二进制为:\n%@",newBinaryString);

    

    [selfbinaryStringToHexString:newBinaryString];

}

#pragma mark - 二进制转为十六进制字符串

- (void)binaryStringToHexString:(NSString *)newBinaryString{

    NSString *hexString=@"";

    

    for (int i=0; i<[newBinaryStringlength]/4;
i++) {

        

        NSRange rage;

        rage.length =4;

        rage.location = i*4;

        NSString *key = [newBinaryStringsubstringWithRange:rage];

        

        hexString = [NSStringstringWithFormat:@"%@%@",hexString,[NSStringstringWithFormat:@"%@",[self.removeSecretDicobjectForKey:key]]];

        

    }

    

    NSLog(@"二进制字符串转为十六进制字符串:\n%@",hexString);

    

    [selfunlokHexStringTranslateToBinaryString:hexString];

}