iphone - NSString is NULL -


hiiii freinds please guys me why str null creasy 

nsstring *strdata = @"issam  bey"   ;  nsmutabledata *objnsdata = [nsmutabledata datawithdata:[strdata datausingencoding:nsisolatin1stringencoding]];   objnsdata = [objnsdata encryptaes:@"12345678901234561234567890123456"]; //nsstring* decryptedstr = [[nsstring alloc] initwithdata:objnsdata encoding:nsasciistringencoding];  nsstring *str=[[nsstring alloc] initwithdata: objnsdata encoding:nsutf8stringencoding];  nslog(@"%@",str);

if doing encryption , decryption read encrypting / decrypting / base64 encode / decode in iphone objective-c.

for aes256 encryption-decryption, read adding methods nsdata , nsstring using categories provide aes256 encryption on ios.


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