IOS or Algorithmic summary (XOR)

Method 1:

Encryption

-(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];

}

Decrypt

-(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;

}

Method 2:

Client built-in private keyStaticNSStringConst *PRIVATEKEY =@ "Ef37c9111210854f5986fc9ebb5548b2ae";@implementationNSData (Xorencrypt)-(NSData *) xor_decrypt{return [Self xor_encrypt];}Encryption-(NSData *) xor_encrypt{Get the length of the keyNsinteger length = privatekey.length;Converting an OC string to a C stringConstchar *keys = [Privatekey cstringusingencoding:Nsasciistringencoding];UnsignedChar Ckey[length]; memcpy (Ckey, keys, length);//data initialization, space unassigned mates use appendbytes nsmutabledata *encryptData = [ [nsmutabledata alloc] initwithcapacity:length]; //get byte pointer const byte *point =  Self.bytes; for (int i = 0; i < SELF.LENGTH; i++) {int l = i% length; //calculates the current position byte, the key byte to be the XOR operation of the key, char C = ckey[l]; byte B = (byte) ((Point[i]) ^ c); //xor operation [encryptData appendbytes:&b length:1]; //append byte} return encryptdata.copy;}  @end             

Method 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)

/** Encryption */

-(NSData *) Xor_encrypt;

/** Decryption */

-(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

Client built-in private key

static NSString Const *privatekey = @ "Ef37c9111210854f5986fc9ebb5548b2ae";

@implementation NSData (Xorencrypt)

Decrypt

-(NSData *) Xor_decrypt {

return [self xor_encrypt];

}

Encryption

-(NSData *) Xor_encrypt {

Get the length of the key

Nsinteger length = privatekey.length;

Converting an OC string to a C string

const char *keys = [Privatekey cstringusingencoding:nsasciistringencoding];

unsigned char ckey[length];

memcpy (Ckey, keys, length);

Data initialization, space not allocated with use of appendbytes

Nsmutabledata *encryptdata = [[Nsmutabledata alloc] initwithcapacity:length];

Get byte pointer

Const Byte *point = self.bytes;

for (int i = 0; i < self.length; i++) {

int L = i% length; Calculates the key bytes of the current position byte, and the XOR operation of the key

char C = ckey[l];

byte B = (byte) ((Point[i]) ^ c); XOR or operation

[EncryptData appendbytes:&b length:1]; Append bytes

}

return encryptdata.copy;

}

@end

IOS or Algorithmic summary (XOR)