Convert AES encryption of android in Objective-c xcode -

i have use aes encryption , decryption similiar below code

need pass similiar data android did generate key

  package encypt.com;  import java.io.bufferedreader; import java.io.filereader; import java.security.*; import java.security.spec.invalidkeyspecexception; import javax.crypto.cipher; import javax.crypto.spec.secretkeyspec; import sun.misc.*;  public class testing {  private static final string algorithm = "aes"; private static final int iterations = 2; private static final byte[] keyvalue =      new byte[] { 't', 'h', 'i', 's', 'i', 's', 'a', 's', 'e', 'c', 'r', 'e', 't', 'k', 'e', 'y'};  public static string encrypt(string value, string salt) throws exception {     key key = generatekey();     cipher c = cipher.getinstance(algorithm);       c.init(cipher.encrypt_mode, key);      string valuetoenc = null;     string evalue = value;     (int = 0; < iterations; i++) {         valuetoenc = salt + evalue;         byte[] encvalue = c.dofinal(valuetoenc.getbytes());         evalue = new base64encoder().encode(encvalue);     }     return evalue; }  public static string decrypt(string value, string salt) throws exception {     key key = generatekey();     cipher c = cipher.getinstance(algorithm);     c.init(cipher.decrypt_mode, key);      string dvalue = null;     string valuetodecrypt = value;     (int = 0; < iterations; i++) {         byte[] decordedvalue = new base64decoder().decodebuffer(valuetodecrypt);         byte[] decvalue = c.dofinal(decordedvalue);         dvalue = new string(decvalue).substring(salt.length());         valuetodecrypt = dvalue;     }     return dvalue; }  private static key generatekey() throws exception {     key key = new secretkeyspec(keyvalue, algorithm);     // secretkeyfactory keyfactory = secretkeyfactory.getinstance(algorithm);     // key = keyfactory.generatesecret(new deskeyspec(keyvalue));     return key; } 

for ios used

 i've found code through lots of research:

#import "<commoncrypto/commoncryptor.h>" @implementation nsmutabledata(aes) 

for encryption:

- (nsmutabledata*) encryptaes:(nsstring *)key {     char keyptr[kcckeysizeaes256+1];     bzero( keyptr, sizeof(keyptr) );      [key getcstring: keyptr maxlength: sizeof(keyptr) encoding: nsutf16stringencoding];     size_t numbytesencrypted = 0;      nsuinteger datalength = [self length];      size_t buffersize = datalength + kccblocksizeaes128;     void *buffer = malloc(buffersize);      nsmutabledata *output = [[nsdata alloc] init];      cccryptorstatus result = cccrypt(kccencrypt, kccalgorithmaes128, kccoptionpkcs7padding, keyptr, kcckeysizeaes256, null, [self mutablebytes], [self length], buffer, buffersize, &numbytesencrypted);      output = [nsmutabledata datawithbytesnocopy:buffer length:numbytesencrypted];      if(result == kccsuccess) {         return output;     }         return null;     } 

for decryption:

- (nsmutabledata*)decryptaes: (nsstring*)key andfordata:(nsmutabledata*)objencrypteddata {      char  keyptr[kcckeysizeaes256+1];     bzero( keyptr, sizeof(keyptr) );      [key getcstring:keyptr maxlength:sizeof(keyptr) encoding:nsutf16stringencoding];      size_t numbytesencrypted = 0;      nsuinteger datalength = [self length];      size_t buffersize = datalength + kccblocksizeaes128;     void *buffer_decrypt = malloc(buffersize);         nsmutabledata *output_decrypt = [[nsdata alloc] init];     cccryptorstatus result = cccrypt(kccdecrypt , kccalgorithmaes128, kccoptionpkcs7padding, keyptr, kcckeysizeaes256, null, [self mutablebytes], [self length], buffer_decrypt, buffersize, &numbytesencrypted);      output_decrypt = [nsmutabledata datawithbytesnocopy:buffer_decrypt length:numbytesencrypted];      if(result == kccsuccess) {         return output_decrypt;     }          return null;     } } 

this code made correspond above code:

- (void)encrypt {     //convert nsstring nsdata can used encrypt input     nsstring *input  = [inputbox text];     nsdata *inputdata = [input datausingencoding:nsutf8stringencoding];     //what here } 

how use code, these methods? go in implementation file? line near top says you're adding aes functionality nsmutabledata:

@implementation nsmutabledata(aes) 

in objective-c, called category; categories let extend existing class.

this code typically go in file named nsmutabledata-aes.m. create header file too, nsmutabledata-aes.h. should contain:

@interface nsmutabledata(aes) - (nsmutabledata*) encryptaes: (nsstring *) key; @end 

include (#import) header in main file. add call encryption function in code:

nsdata *inputdata = [input datausingencoding:nsutf8stringencoding]; nsdata *encrypteddata = [inputdata encryptaes:@"myencryptionkey"]; 

similarly decryption.

but unable set keyvalue , salt android did! please help

  private static final byte[] keyvalue =          new byte[] { 't', 'h', 'i', 's', 'i', 's', 'a', 's', 'e', 'c', 'r', 'e', 't', 'k', 'e', 'y'};   valuetoenc = salt + evalue; 

you can use third party library rncryptor in cocoapods en/decryption

// encryption nsdata *data = ... nsstring *password = @"secret password"; nsdata *ciphertext = [rncryptor encryptdata:data password:password];  // decryption nserror *error = nil; nsdata *plaintext = [rncryptor decryptdata:ciphertext password:password error:&error]; if (error != nil) {     nslog(@"error:%@", error);     return } // ...