我需要在Objective C中生成HMAC-SHA1,但是我没有找到任何可以工作的东西。我尝试使用CommonCrypto,使用CCHMAC,但不起作用。我需要生成一个hmac,然后生成HOTP编号。
有人在Objective C或C中有示例代码吗?
发布于 2009-04-16 14:59:47
下面是如何使用SHA-256生成HMAC:
NSString *key;
NSString *data;
const char *cKey = [key cStringUsingEncoding:NSASCIIStringEncoding];
const char *cData = [data cStringUsingEncoding:NSASCIIStringEncoding];
unsigned char cHMAC[CC_SHA256_DIGEST_LENGTH];
CCHmac(kCCHmacAlgSHA256, cKey, strlen(cKey), cData, strlen(cData), cHMAC);
NSData *HMAC = [[NSData alloc] initWithBytes:cHMAC
length:sizeof(cHMAC)];
NSString *hash = [HMAC base64Encoding];
我不知道HOTP库,但如果我没记错的话,算法非常简单。
发布于 2013-05-09 17:41:56
这是一个完整的解决方案,它不需要任何额外的库或hack:
+(NSString *)hmac:(NSString *)plainText withKey:(NSString *)key
{
const char *cKey = [key cStringUsingEncoding:NSASCIIStringEncoding];
const char *cData = [plainText cStringUsingEncoding:NSASCIIStringEncoding];
unsigned char cHMAC[CC_SHA256_DIGEST_LENGTH];
CCHmac(kCCHmacAlgSHA256, cKey, strlen(cKey), cData, strlen(cData), cHMAC);
NSData *HMACData = [[NSData alloc] initWithBytes:cHMAC length:sizeof(cHMAC)];
const unsigned char *buffer = (const unsigned char *)[HMACData bytes];
NSString *HMAC = [NSMutableString stringWithCapacity:HMACData.length * 2];
for (int i = 0; i < HMACData.length; ++i)
HMAC = [HMAC stringByAppendingFormat:@"%02lx", (unsigned long)buffer[i]];
return HMAC;
}
您不必包含任何第三方base64库,因为它已经编码好了。
发布于 2011-11-28 03:12:52
这在不使用自定义协议的情况下工作,使用http://cocoawithlove.com/2009/07/hashvalue-object-for-holding-md5-and.html中的一些代码
HashSHA256.h
#import <Foundation/Foundation.h>
#import <CommonCrypto/CommonDigest.h>
@interface HashSHA256 : NSObject {
}
- (NSString *) hashedValue :(NSString *) key andData: (NSString *) data ;
@end
HashSHA256.m
#import "HashSHA256.h"
#import <CommonCrypto/CommonHMAC.h>
@implementation HashSHA256
- (NSString *) hashedValue :(NSString *) key andData: (NSString *) data {
const char *cKey = [key cStringUsingEncoding:NSUTF8StringEncoding];
const char *cData = [data cStringUsingEncoding:NSUTF8StringEncoding];
unsigned char cHMAC[CC_SHA256_DIGEST_LENGTH];
CCHmac(kCCHmacAlgSHA256, cKey, strlen(cKey), cData, strlen(cData), cHMAC);
NSString *hash;
NSMutableString* output = [NSMutableString stringWithCapacity:CC_SHA256_DIGEST_LENGTH * 2];
for(int i = 0; i < CC_SHA256_DIGEST_LENGTH; i++)
[output appendFormat:@"%02x", cHMAC[i]];
hash = output;
return hash;
}
@end
用法:
- (NSString *) encodePassword: (NSString *) myPassword {
HashSHA256 * hashSHA256 = [[HashSHA256 alloc] init];
NSString * result = [hashSHA256 hashedValue:mySecretSalt andData:myPassword];
return result;
}
https://stackoverflow.com/questions/756492
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