The use of AES encryption in iOS

Now do the app, because of security, so the use of AES encryption, and paired with the use of Android AES encryption.

. h file

#import <Foundation/Foundation.h> #import <CommonCrypto/CommonCryptor.h> #import <commoncrypto/ commonkeyderivation.h> #define AES_KEY @ "[email protected]!*&y.) X#[;> "#define AES_IV @" 0102030405060708 "@interface NSData (AES) + (NSString *) Aesencryptwithdata: (NSData *) data;+ ( NSData *) Aesdecryptwithtext: (NSString *) text;

. m file

#import "Nsdata+aes.h" @implementation NSData (AES) static const char encodingtable[] = " abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz0123456789+/"; + (NSString *) Aesencryptwithdata: (NSData *) data  {//' key ' should is bytes for AES256, 'll be null-padded otherwise char keyptr[kcckeysizeaes256+1];// Terminator (unused) bzero (keyptr, sizeof (KEYPTR));        Fill with zeroes (for padding) nsuinteger datalength = [data length];    size_t buffersize = datalength + kCCBlockSizeAES128;    void *buffer = malloc (buffersize);        bzero (buffer, sizeof (buffer));        size_t numbytesencrypted = 0;                                          Cccryptorstatus cryptstatus = Cccrypt (Kccencrypt, kccalgorithmaes128,kccoptionpkcs7padding,                                          [[Aes_key datausingencoding:nsutf8stringencoding] bytes], kCCKeySizeAES128,                     [[Aes_iv datausingencoding:nsutf8stringencoding] bytes]/* initialization vector (optional) */,                     [Data bytes], datalength,/* input */buffer, buffersize,/*    Output */&numbytesencrypted); if (Cryptstatus = = kccsuccess) {NSData *encryptdata = [NSData datawithbytesnocopy:buffer length:numbytesencrypted]        ;            return [EncryptData base64encoding2]; } free (buffer);    Free the buffer; return nil;}    + (NSData *) Aesdecryptwithtext: (NSString *) text{nsdata *cipherdata = [NSData Datawithbase64encodedstring:text]; ' Key ' should is bytes for AES256, 'll be null-padded otherwise char keyptr[kcckeysizeaes256+1]; The Terminator (unused) bzero (keyptr, sizeof (KEYPTR));        Fill with zeroes (for padding) nsuinteger datalength = [CipherData length];    size_t buffersize = datalength + kCCBlockSizeAES128;        void *buffer = malloc (buffersize);    size_t numbytesdecrypted = 0; Cccryptorstatus cryptstatus = Cccrypt (kccdecryPT, kCCAlgorithmAES128, kccoptionpkcs7padding, [[Aes_key Datausingencoding:nsutf8 Stringencoding] bytes], kCCKeySizeAES128, [[Aes_iv datausingencoding:nsutf8string Encoding] bytes],/* initialization vector (optional) */[CipherData bytes], data                                          Length,/* input */buffer, buffersize,/* output */        &numbytesdecrypted);    if (Cryptstatus = = kccsuccess) {return [NSData datawithbytesnocopy:buffer length:numbytesdecrypted]; } free (buffer);    Free the buffer; return nil;} + (ID) datawithbase64encodedstring: (NSString *) string;    {if (string = nil) [NSException raise:nsinvalidargumentexception Format:nil];        if ([string length] = = 0) return [NSData data];    static char *decodingtable = NULL; if (decodingtable = = NULL) {decodingtable = malloc (256);        if (decodingtable = = NULL) return nil;        memset (decodingtable, Char_max, 256);        Nsuinteger i;    for (i = 0; i <, i++) decodingtable[(short) encodingtable[i]] = i;    } const char *characters = [string cstringusingencoding:nsasciistringencoding];        if (characters = = NULL)//Not an ASCII string!    return nil;    Char *bytes = malloc ((([string length] + 3)/4) * 3);    if (bytes = = NULL) return nil;        Nsuinteger length = 0;    Nsuinteger i = 0;        while (YES) {char buffer[4];        Short bufferlength;            for (bufferlength = 0; bufferlength < 4; i++) {if (characters[i] = = ' + ') break;            if (Isspace (characters[i]) | | characters[i] = = ') continue;            Buffer[bufferlength] = decodingtable[(short) characters[i]];            if (buffer[bufferlength++] = = Char_max)//illegal character!           {     Free (bytes);            return nil;        }} if (bufferlength = = 0) break;        if (bufferlength = = 1)//At least-characters is needed to produce one byte!            {free (bytes);        return nil;        }//Decode the characters in the buffer to bytes. bytes[length++] = (Buffer[0] << 2) |        (Buffer[1] >> 4); if (Bufferlength > 2) bytes[length++] = (buffer[1] << 4) |        (Buffer[2] >> 2); if (Bufferlength > 3) bytes[length++] = (buffer[2] << 6) |    BUFFER[3];    } bytes = realloc (bytes, length); return [NSData datawithbytesnocopy:bytes length:length];} -(NSString *) base64encoding2;        {if ([self length] = = 0) return @ "";    Char *characters = malloc (([Self length] + 2)/3) * 4);    if (characters = = NULL) return nil;        Nsuinteger length = 0;    Nsuinteger i = 0; while (i < [self lengTH]) {char buffer[3] = {0,0,0};        Short bufferlength = 0; while (Bufferlength < 3 && i < [self length]) buffer[bufferlength++] = ((char *) [self bytes]) [i++                ];        Encode the bytes in the buffer to four characters, including padding "=" characters if necessary.        characters[length++] = encodingtable[(buffer[0] & 0xFC) >> 2]; characters[length++] = encodingtable[((buffer[0] & 0x03) << 4) |        ((Buffer[1] & 0xF0) >> 4)]; if (Bufferlength > 1) characters[length++] = encodingtable[((buffer[1] & 0x0F) << 2) |        ((Buffer[2] & 0xC0) >> 6)];        else characters[length++] = ' = ';        if (Bufferlength > 2) characters[length++] = encodingtable[buffer[2] & 0x3F];    else characters[length++] = ' = '; } return [[NSString alloc] initwithbytesnocopy:characters length:length encoding:nsasciistringencoding freeWhenDone : YES];} @end

Java file

Package Com.yuxin168.library.util;import Java.io.unsupportedencodingexception;import Java.security.invalidalgorithmparameterexception;import Java.security.invalidkeyexception;import Java.security.nosuchalgorithmexception;import Javax.crypto.badpaddingexception;import Javax.crypto.Cipher;import Javax.crypto.illegalblocksizeexception;import Javax.crypto.nosuchpaddingexception;import  Javax.crypto.spec.ivparameterspec;import javax.crypto.spec.secretkeyspec;import android.util.Base64;/** * AESº "√‹* * @author Baoyz * */public class AES {public static final string Vipara = "0102030405060708";p ublic static final string b m = "UTF-8";/** *º "√‹* * @param content *–ë" ™º "√‹µƒƒ⁄»›* @param password *º" √‹√‹¬î* @return * /public static string Encrypt (string content) {try {ivparameterspec zeroiv = new Ivparameterspec (Vipara.getbytes ()); Secretkeyspec key = new Secretkeyspec (GetKey (). GetBytes (), "AES"); Cipher Cipher = cipher.getinstance ("aes/cbc/pkcs5padding"); Cipher.init (CiPher. Encrypt_mode, key, ZEROIV); byte[] EncryptedData = cipher.dofinal (content.getbytes (BM)); return base64.encodetostring ( EncryptedData, 0);} catch (NoSuchAlgorithmException e) {e.printstacktrace ();} catch (Nosuchpaddingexception e) {e.printstacktrace ();} catch (InvalidKeyException e) {e.printstacktrace ();} catch (Unsupportedencodingexception e) {e.printstacktrace ();} catch (Illegalblocksizeexception e) {e.printstacktrace ();} catch (Badpaddingexception e) {e.printstacktrace ();} catch ( Invalidalgorithmparameterexception e) {e.printstacktrace ();} return null;} /** *ω ' √‹* * @param content *¥?ω ' √‹ƒ⁄»›* @param password *ω ' √‹√‹ ' ø* @return */public static S Tring Decrypt (String content) {try {byte[] Bytemi = Base64.decode (content.getbytes (BM), 0); Ivparameterspec zeroiv = new Iv Parameterspec (Vipara.getbytes ()); Secretkeyspec key = new Secretkeyspec (GetKey (). GetBytes (), "AES"); Cipher Cipher = cipher.getinstance ("aes/cbc/pkcs5padding"); Cipher.init (Cipher.decrypt_mode, key, ZEROIV); byte[] Decrypteddata = cipher.dofinal (Bytemi); return new String (Decrypteddata, BM);} catch (NoSuchAlgorithmException e) {e.printstacktrace ();} catch (Nosuchpaddingexception e) {e.printstacktrace ();} catch (InvalidKeyException e) {e.printstacktrace ();} catch (Illegalblocksizeexception e) {e.printstacktrace ();} catch ( Badpaddingexception e) {e.printstacktrace (),} catch (Unsupportedencodingexception e) {e.printstacktrace ();} catch ( Invalidalgorithmparameterexception e) {e.printstacktrace ();} return null;} public static String GetKey () {return "[Email protected]!*&y.] X#[;> ";}}

As follows:

Http://pan.baidu.com/s/1kT1bzSV