3 Ways to encrypt IOS

Need to import #import <CommonCrypto/CommonCryptor.h>

==============MD5 Encryption ============

NSString *str = @ "Encrypted content";

String converted to C language

const char *CSTR=[STR utf8string];

The result of MD5 encryption is 128 bits, which requires a 16-byte space to be opened

unsigned char result[16];

Calling cryptographic functions

CC_MD5 (CSTR, (unsigned int) strlen (CSTR), result);

The MD5 obtained by the above method is a 16-character array that needs to be converted to a 32-bit MD5 value

nsmutablestring *string = [nsmutablestring stringwithcapacity:10];

for (int i=; i<16; i++) {

[String appendstring:[nsstring stringwithformat:@ "%02x", Result[i]];

}

NSLog (@ "MD5 encryption:%@", string);

===============base64 Encryption and decryption =============

iOS7 later provides the Base64 transcoding method

Encryption

NSString *[email protected] "encrypted content";

NSData *passdata=[pass datausingencoding:nsutf8stringencoding];

NSString *result = [PassData base64encodedstringwithoptions:nsdatabase64encodingendlinewithlinefeed];

NSLog (@ "base64 encryption:%@", result);

Decrypt

NSData *decodedata = [[NSData alloc]initwithbase64encodedstring:result options:];

NSString *decodestr = [[NSString alloc]initwithdata:decodedata encoding:nsutf8stringencoding];

NSLog (@ "Base64 decryption:%@", DECODESTR);

================aes Encryption and decryption ===============

Create a new NSData class and write a two-bit method

Encryption method

-(nsdata*) Aes256encryptwithkey: (nsstring*) Key {

Char keyptr[kcckeysizeaes256 + 1]; Terminator (unused)

Bzero (keyptr, sizeof (KEYPTR)); Fill with zeroes (for padding)

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

Nsuinteger datalength = [self length];

size_t buffersize = datalength + kCCBlockSizeAES128;

void* buffer = malloc (buffersize);

size_t numbytesencrypted =;

Cccryptorstatus cryptstatus = Cccrypt (Kccencrypt, kCCAlgorithmAES128, kccoptionpkcs7padding,

Keyptr, kCCKeySizeAES256,

NULL/* initialization vector (optional) */,

[Self bytes], datalength,/* input */

Buffer, buffersize,/* output */

&numbytesencrypted);

if (Cryptstatus = = kccsuccess) {

return [NSData Datawithbytesnocopy:buffer length:numbytesencrypted];

}

Free (buffer);

return nil;

}

Decryption method

-(nsdata*) Aes256decryptwithkey: (nsstring*) Key {

Char keyptr[kcckeysizeaes256 + 1]; Terminator (unused)

Bzero (keyptr, sizeof (KEYPTR)); Fill with zeroes (for padding)

Fetch key Data

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

Nsuinteger datalength = [self length];

size_t buffersize = datalength + kCCBlockSizeAES128;

void* buffer = malloc (buffersize);

size_t numbytesdecrypted =;

Cccryptorstatus cryptstatus = Cccrypt (Kccdecrypt, kCCAlgorithmAES128, kccoptionpkcs7padding,

Keyptr, kCCKeySizeAES256,

NULL/* initialization vector (optional) */,

[Self bytes], datalength,/* input */

Buffer, buffersize,/* output */

&numbytesdecrypted);

if (Cryptstatus = = kccsuccess) {

return [NSData Datawithbytesnocopy:buffer length:numbytesdecrypted];

}

Free (buffer); Free the buffer;

In another class, call the method in the NSData above.

==========aes Encryption and decryption =============

NSString *key = @ "MyKey";//Key

NSString *secret = @ "Encrypt content";//Prepare encrypted content

NSData *plain = [Secret datausingencoding:nsutf8stringencoding];

NSData *ciper = [plain aes256encryptwithkey:key];

NSLog (@ "AES encryption%@", Ciper);

Decrypt

Plain = [Ciper Aes256decryptwithkey:key];

NSLog (@ "AES decryption:%@", [[NSString Alloc]initwithdata:plain encoding:nsutf8stringencoding]);

3 Ways to encrypt IOS