Implementation of IOSAES Encryption

+ (NSData *) Aes256parmencryptwithkey: (NSString *) key encrypttext: (NSData *) text//encryption

{

Char keyptr[kcckeysizeaes256+1];

Bzero (keyptr, sizeof (KEYPTR));

[Key Getcstring:keyptr maxlength:sizeof (KEYPTR) encoding:nsutf8stringencoding];

Nsuinteger datalength = [text length];

size_t buffersize = datalength + kCCBlockSizeAES128;

void *buffer = malloc (buffersize);

size_t numbytesencrypted = 0;

Cccryptorstatus cryptstatus = Cccrypt (Kccencrypt, kCCAlgorithmAES128,

kccoptionpkcs7padding | Kccoptionecbmode,

Keyptr, kCCBlockSizeAES128,

Null

[Text bytes], datalength,

Buffer, buffersize,

&numbytesencrypted);

if (Cryptstatus = = kccsuccess) {

return [NSData Datawithbytesnocopy:buffer length:numbytesencrypted];

}

Free (buffer);

return nil;

}

+ (NSData *) Aes256parmdecryptwithkey: (NSString *) key decrypttext: (NSData *) text//decryption

{

Char keyptr[kcckeysizeaes256+1];

Bzero (keyptr, sizeof (KEYPTR));

[Key Getcstring:keyptr maxlength:sizeof (KEYPTR) encoding:nsutf8stringencoding];

Nsuinteger datalength = [text length];

size_t buffersize = datalength + kCCBlockSizeAES128;

void *buffer = malloc (buffersize);

size_t numbytesdecrypted = 0;

Cccryptorstatus cryptstatus = Cccrypt (Kccdecrypt, kCCAlgorithmAES128,

kccoptionpkcs7padding | Kccoptionecbmode,

Keyptr, kCCBlockSizeAES128,

Null

[Text bytes], datalength,

Buffer, buffersize,

&numbytesdecrypted);

if (Cryptstatus = = kccsuccess) {

return [NSData Datawithbytesnocopy:buffer length:numbytesdecrypted];

}

Free (buffer);

return nil;

}

+ (NSString *) Aes256_encrypt: (NSString *) key encrypttext: (NSString *) text

{

const char *CSTR = [text cstringusingencoding:nsutf8stringencoding];

NSData *data = [NSData datawithbytes:cstr length:text.length];

Encrypt the data

NSData *result = [Lanaes aes256parmencryptwithkey:key encrypttext:data];

Convert to 2 binary string

If (Result && result.length > 0) {

Byte *datas = (byte*) [result bytes];

nsmutablestring *output = [nsmutablestring stringWithCapacity:result.length * 2];

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

[Output appendformat:@ "%02x", Datas[i]];

}

return output;

}

return nil;

}

+ (NSString *) Aes256_decrypt: (NSString *) key decrypttext: (NSString *) text

{

Convert to 2 binary data

Nsmutabledata *data = [Nsmutabledata DATAWITHCAPACITY:TEXT.LENGTH/2];

unsigned char whole_byte;

Char byte_chars[3] = {' n ', ' + ', ' + '};

int i;

for (i=0; i < [text length]/2; i++) {

Byte_chars[0] = [text characteratindex:i*2];

BYTE_CHARS[1] = [text characteratindex:i*2+1];

Whole_byte = Strtol (Byte_chars, NULL, 16);

[Data appendbytes:&whole_byte length:1];

}

Decrypt the data

nsdata* result = [Lanaes aes256parmdecryptwithkey:key decrypttext:data];

If (Result && result.length > 0) {

return [[NSString alloc] Initwithdata:result encoding:nsutf8stringencoding];

}

return nil;

}

Implementation of IOSAES Encryption