Maison >développement back-end >tutoriel php >objective-c实现authCode 解决php与ios通信加密的问题
最近项目中要加密与服务器的通讯内容,主要是为了防止恶意的抓包利用,本来这样的加密直接在网上就可以找到的,但是无奈关于OC的几乎都来自同一个模版,加密出来的字符窜无法被PHP后端解析,并且也没有有效时间的参数,所以只能对照PHP的加密代码写一个OC版的,其中PHP的很多方法,在OC当中远远没有一句话那么简单(::>_<::>
#import <CommonCrypto/CommonDigest.h>#define STRING_SPLICE(a,b) ([NSString stringWithFormat:@"%@%@",(NSString *)(a),(NSString *)(b)])//字符串拼接
+ (NSString *)md5:(NSString *)str { const char *cStr = [str UTF8String]; unsigned char result[16]; CC_MD5(cStr, strlen(cStr), result); // This is the md5 call return [NSString stringWithFormat: @"%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x", result[0], result[1], result[2], result[3], result[4], result[5], result[6], result[7], result[8], result[9], result[10], result[11], result[12], result[13], result[14], result[15] ];}
// param: 要加密的字符串// operation: 传入@"ENCODE" 为加密,解密没有写,所以只要不传"DECODE"就OK了// expiry: 有效时间,单位是秒,默认时0,就是没有时效,如果设置后超出有效时间,将无法被解密+ (NSString *)encryption:(NSString *)param operation:(NSString *)operation expiry:(int)expiry{ NSString *key = @"1992326qa"; // 加密的密钥 NSString *DECODE = @"DECODE"; param = [param stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]; operation = operation ? operation : DECODE; expiry = expiry ? expiry : 0; int keyLength = 4; key = [self md5:key]; NSString *keya = [self md5:[key substringToIndex:16]]; NSString *keyb = [self md5:[key substringFromIndex:16]]; NSString *time = [self microtime]; NSString *keyc = keyLength ? ([operation isEqualToString:DECODE] ? [param substringToIndex:keyLength] : [[self md5:time] substringFromIndex:[self md5:time].length - keyLength]) : @""; NSString *cryptkey = STRING_SPLICE(keya, [self md5:STRING_SPLICE(keya, keyc)]); keyLength = cryptkey.length; param = [NSString stringWithFormat:@"%@%@%@",([NSString stringWithFormat:@"%010d",expiry ? expiry + (int)[[NSDate dateWithTimeIntervalSinceNow:0] timeIntervalSince1970] : expiry]),[[self md5: STRING_SPLICE(param,keyb)] substringToIndex:16],param]; int paramLength = param.length; NSString *result = @""; NSMutableArray *box = [NSMutableArray arrayWithCapacity:UnicodeCount]; for (int i = 0; i <= UnicodeCount; i++) { [box addObject:@(i)]; } NSMutableArray *rndkey = [NSMutableArray array]; for (int i = 0; i <= UnicodeCount; i++) { const char rndkeyItem = [cryptkey characterAtIndex:i % keyLength]; NSString *asciiStr = [NSString stringWithCString:&rndkeyItem encoding:NSASCIIStringEncoding]; int asciiCode = [asciiStr characterAtIndex:0]; [rndkey addObject:@(asciiCode)]; } for (int i=0,j = 0; i <= UnicodeCount; i++) { j = (j + [box[i] intValue] + [rndkey[i] intValue]) % (UnicodeCount + 1); int tmp = [box[i] intValue]; box[i] = box[j]; box[j] = @(tmp); } for (int a = 0,j = 0,i = 0; i < paramLength; i ++) { a = (a + 1) % (UnicodeCount + 1); j = (j + [box[a] intValue]) % (UnicodeCount + 1); int tmp = [box[a] intValue]; box[a] = box[j]; box[j] = @(tmp); int s1 = [self ord:param index:i]; int s2 = [box[([box[a] intValue] + [box[j] intValue]) % (UnicodeCount + 1)] intValue]; int s3 = s1 ^ s2; NSString *add = [self strChr:s3]; result = STRING_SPLICE(result, add); } return [NSString stringWithFormat:@"%@%@",keyc,[[self base64:result] stringByReplacingOccurrencesOfString:@"=" withString:@""]];}
+ (NSString *)microtime // 计算时间串{ NSDate *currentDate = [NSDate dateWithTimeIntervalSinceNow:0]; NSTimeInterval interval = [currentDate timeIntervalSince1970]; NSString *intervalStr = [NSString stringWithFormat:@"%f00",interval]; NSString *pre = [intervalStr substringWithRange:NSMakeRange(intervalStr.length - 8, 8)]; NSString *suf = [intervalStr substringToIndex:intervalStr.length - 9]; NSString *result = [NSString stringWithFormat:@"0.%@ %@",pre,suf]; return result;}
+ (int)ord:(NSString *)str index:(int)index // 获取字符串某一位的ASCII码{ int asciiCode = [str characterAtIndex:index]; return asciiCode;}
+ (const char)chr:(int)asciiCode // 通过ASCII码获取字符{ return [[NSString stringWithFormat:@"%C",(unichar)asciiCode] characterAtIndex:0];}
+ (NSString *)strChr:(int)asciiCode // 通过ASCII码获取字符串{ NSString *data = [NSString stringWithFormat:@"%C",(unichar)asciiCode]; //A return data;}
+ (NSString *)base64:(NSString *)str // base64编码{ NSString *base64EncodedString = [[str dataUsingEncoding:NSUTF8StringEncoding] base64EncodedStringWithOptions:0]; return base64EncodedString;}
我也是先留着,搞不好什么时候又用到了~