Encryption and decryption of IOS AES

The main is to get the original encryption after the word a, MD5 can not get the original, only to use aes+base64

To use GTMBase64 This can be downloaded on their own,

See the other 2 classes of files mainly.

#import <Foundation/Foundation.h> @class nsstring, @interface NSData (Nsdata_aes)-(NSData *) Aes128encryptwithkey: (NSString *) key;   Encryption-(NSData *) Aes128decryptwithkey: (NSString *) key;   Decryption @end

#import "Nsdata+nsdata_aes.h" #import <CommonCrypto/CommonCryptor.h> #define GIV @ "xxxxxxxxxxx"// The ability to define 16-bit @implementation NSData (NSDATA_AES)//(Key and IV vectors here is 16-bit) here is the CBC encryption mode, security higher-(NSData *) Aes128encryptwithkey: (    NSString *) key//encryption {char keyptr[kcckeysizeaes128+1];    Bzero (keyptr, sizeof (KEYPTR));        [Key Getcstring:keyptr maxlength:sizeof (KEYPTR) encoding:nsutf8stringencoding];    Char ivptr[kcckeysizeaes128+1];    memset (ivptr, 0, sizeof (IVPTR));        [GIv getcstring:ivptr maxlength:sizeof (ivptr) encoding:nsutf8stringencoding];    Nsuinteger datalength = [self length];    size_t buffersize = datalength + kCCBlockSizeAES128;    void *buffer = malloc (buffersize);    size_t numbytesencrypted = 0;                                          Cccryptorstatus cryptstatus = Cccrypt (Kccencrypt, kCCAlgorithmAES128,                                          Kccoptionpkcs7padding, Keyptr, KccblocksizeaeS128, ivptr, [self bytes],                                          datalength, Buffer,    BufferSize, &numbytesencrypted);    if (Cryptstatus = = kccsuccess) {return [NSData datawithbytesnocopy:buffer length:numbytesencrypted];    } free (buffer); return nil;}    -(NSData *) Aes128decryptwithkey: (NSString *) key//decryption {char keyptr[kcckeysizeaes128+1];    Bzero (keyptr, sizeof (KEYPTR));        [Key Getcstring:keyptr maxlength:sizeof (KEYPTR) encoding:nsutf8stringencoding];    Char ivptr[kcckeysizeaes128+1];    memset (ivptr, 0, sizeof (IVPTR));        [GIv getcstring:ivptr maxlength:sizeof (ivptr) encoding:nsutf8stringencoding];    Nsuinteger datalength = [self length];    size_t buffersize = datalength + kCCBlockSizeAES128;    void *buffer = malloc (buffersize); size_t numbytesdecrypted = 0;                                          Cccryptorstatus cryptstatus = Cccrypt (Kccdecrypt, kCCAlgorithmAES128,                                          Kccoptionpkcs7padding, Keyptr,                                          kCCBlockSizeAES128, Ivptr, [Self bytes], datalength, buffer    , buffersize, &numbytesdecrypted);    if (Cryptstatus = = kccsuccess) {return [NSData datawithbytesnocopy:buffer length:numbytesdecrypted];    } free (buffer); return nil;} @end

#import <Foundation/Foundation.h> @interface securityutil:nsobject #pragma mark-base64+ (nsstring*) Encodebase64string: (NSString *) input;+ (nsstring*) decodebase64string: (NSString *) input;+ (NSString*) Encodebase64data: (NSData *) data;+ (nsstring*) Decodebase64data: (NSData *) data; #pragma mark-aes encryption// Turn string into data+ (nsstring*) with password Encryptaesdata: (nsstring*) string App_key: (nsstring*) key;// Turn data with password to string+ (nsstring*) Decryptaesdata: (nsdata*) Data app_key: (nsstring*) key; @end

#import "SecurityUtil.h" #import "GTMBase64.h" #import "nsdata+aes.h" @implementation securityutil#pragma mark-base64+ (nsstring*) Encodebase64string: (NSString *) input {nsdata *data = [input datausingencoding:nsutf8stringencoding AllowL     Ossyconversion:yes];     data = [GTMBase64 encodedata:data]; NSString *base64string = [[[NSString Alloc] initwithdata:data encoding:nsutf8stringencoding] autorelease]; return base64string;} + (nsstring*) decodebase64string: (NSString *) input {nsdata *data = [input datausingencoding:nsutf8stringencoding allo     Wlossyconversion:yes];     data = [GTMBase64 decodedata:data]; NSString *base64string = [[[NSString Alloc] initwithdata:data encoding:nsutf8stringencoding] autorelease]; return base64string;}     + (nsstring*) Encodebase64data: (NSData *) data {data = [GTMBase64 encodedata:data]; NSString *base64string = [[[NSString Alloc] Initwithdata:data encoding:nsutf8stringencoding] Autorelease];return base64string;} + (nsstring*) Decodebase64data: (NsdatA *) data {data = [GTMBase64 decodedata:data]; NSString *base64string = [[[NSString Alloc] Initwithdata:data encoding:nsutf8stringencoding] Autorelease];return base64string;} #pragma mark-aes encryption//convert string to data+ with password (nsstring*) Encryptaesdata: (nsstring*) string App_key: (nsstring*) key{/    /convert NSString to nsdata nsdata *data = [string datausingencoding:nsutf8stringencoding];    Use password to encrypt the nsdata nsdata *encrypteddata = [data Aes128encryptwithkey:key];        NSLog (@ "Encrypted string:%@", [EncryptedData base64encoding]); return [EncryptedData base64encoding];} #pragma mark-aes decryption//Transfer data with password to string+ (nsstring*) Decryptaesdata: (nsdata*) Data app_key: (nsstring*) key{//    Use password to decrypt data nsdata *decrydata = [data Aes128decryptwithkey:key]; Convert the password nsdata to nsstring nsstring *str = [[NSString alloc] initwithdata:decrydata encoding:    Nsutf8stringencoding];    NSLog (@ "decrypted string:%@", str); return [str autorelease];} @end

Detailed usage such as the following:

Encryption:

[securityutilencryptaesdata: @ "XXXXXX" app_key:key]; Here is the ability to set a 16-bit string

Decrypt:

nsdata *encryptdata1 = [GTMBase64decodestring:[securityutil Encryptaesdata: @ "XXXXXX" app_key:key]]; // prior to decryption GTMBase64 Coding

nsstring * string1 = [securityutildecryptaesdata: EncryptData1app_key: KEY];

Encryption and decryption of IOS AES