iOS often uses encryption (MD5,AES,BASE64) and network data security

Demo Sample Project Https://github.com/cerastes/Encryption

1md5

Creating the MD5 Class

#import <Foundation/Foundation.h> @interface cjmd5:nsobject+ (NSString *) Md5hexdigest: (NSString *) input; @end

#import "CJMD5.h" #import <CommonCrypto/CommonDigest.h> @implementation cjmd5+ (NSString *) Md5hexdigest: ( NSString *) input{        const char* str = [input utf8string];    unsigned char result[cc_md5_digest_length];    CC_MD5 (str, strlen (str), result);    nsmutablestring *ret = [nsmutablestring stringwithcapacity:cc_md5_digest_length];        for (int i = 0; i<cc_md5_digest_length; i++) {        [ret appendformat:@ "%02x", result];    }    return ret;} @end

MD5 is irreversible only there is no decryption using the method such as the following

NSString *username = @ "Cerastes"; NSString *password = @ "Hello Word";//   MD5 encryption NSString *md5 = [CJMD5 Md5hexdigest:password]; NSLog (@ "%@", MD5);

2AES encryption

AES encrypted open source code git

Https://github.com/Gurpartap/AESCrypt-ObjC

Usage

  AES Encryption    nsstring *encrypteddata = [Aescrypt encrypt:username password:password];//encryption    NSString *message = [Aescrypt Decrypt:encrypteddata Password:password]; Decrypt    NSLog (@ "Encrypted result =%@", EncryptedData);    NSLog (@ "Decryption result =%@", message);

3 BASE64 Encryption

https://code.google.com/p/google-toolbox-for-mac/source/browse/trunk/Foundation/?r=87

Join for example the following methods

. h

+ (nsstring*) encodebase64string: (NSString *) input;+ (nsstring*) decodebase64string: (NSString *) input;+ (NSString*) Encodebase64data: (NSData *) data;+ (nsstring*) Decodebase64data: (NSData *) data;

. m

+ (nsstring*) encodebase64string: (NSString *) input {nsdata *data = [input datausingencoding:nsutf8stringencoding allow    Lossyconversion:yes];    data = [GTMBase64 encodedata:data];    NSString *base64string = [[NSString alloc] Initwithdata:data encoding:nsutf8stringencoding]; return base64string;} + (nsstring*) decodebase64string: (NSString *) input {nsdata *data = [input datausingencoding:nsutf8stringencoding allow    Lossyconversion:yes];    data = [GTMBase64 decodedata:data];    NSString *base64string = [[NSString alloc] Initwithdata:data encoding:nsutf8stringencoding]; return base64string;}    + (nsstring*) Encodebase64data: (NSData *) data {data = [GTMBase64 encodedata:data];    NSString *base64string = [[NSString alloc] Initwithdata:data encoding:nsutf8stringencoding]; return base64string;}    + (nsstring*) Decodebase64data: (NSData *) data {data = [GTMBase64 decodedata:data];    NSString *base64string = [[NSString alloc] Initwithdata:data encoding:nsutf8stringencoding]; RetUrn base64string;} 

Usage

    BASE64 encryption    nsstring *baseencodestring = [GTMBase64 Encodebase64string:password];    NSString *basedecodestring = [GTMBase64 decodebase64string:baseencodestring];    NSLog (@ "baseencodestring =%@", baseencodestring);    NSLog (@ "basedecodestring =%@", basedecodestring);