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//
// THWebUtility.m
// UserSystem
//
// Created by Hao Tan on 12-3-20.
// Copyright (c) 2012年 http://www.tanhao.me All rights reserved.
//
#import "THWebUtility.h"
#import <CommonCrypto/CommonDigest.h>
#import <CommonCrypto/CommonHMAC.h>
#import <CommonCrypto/CommonCryptor.h>
@implementation THWebUtility
#pragma mark -
#pragma mark Hash
#define THHashSizeForRead (4*1024)
+ (NSString *)hashFile:(NSString *)filePath with:(THHashKind)hashKind
{
NSInputStream *inputStream = [[NSInputStream alloc] initWithFileAtPath:filePath];
if (!inputStream)
{
return nil;
}
void *CTXPoint = NULL;
switch (hashKind)
{
case THHashKindMd5:
{
CTXPoint = (CC_MD5_CTX *)calloc(1, (sizeof(CC_SHA1_CTX)));
CC_MD5_Init(CTXPoint);
break;
}
case THHashKindSha1:
{
CTXPoint = (CC_SHA1_CTX *)calloc(1, (sizeof(CC_SHA1_CTX)));
CC_SHA1_Init(CTXPoint);
break;
}
case THHashKindSha256:
{
CTXPoint = (CC_SHA256_CTX *)calloc(1, (sizeof(CC_SHA256_CTX)));
CC_SHA256_Init(CTXPoint);
break;
}
case THHashKindSha512:
{
CTXPoint = (CC_SHA512_CTX *)calloc(1, (sizeof(CC_SHA512_CTX)));
CC_SHA512_Init(CTXPoint);
break;
}
default:
{
return nil;
break;
}
}
[inputStream open];
while (YES)
{
uint8_t buffer[THHashSizeForRead];
NSInteger readBytesCount = [inputStream read:buffer maxLength:sizeof(buffer)];
if (readBytesCount < 0)
{
[inputStream close];
free(CTXPoint);
return nil;
}
else if (readBytesCount == 0)
{
break;
}
switch (hashKind)
{
case THHashKindMd5:
{
CC_MD5_Update(CTXPoint,(const void *)buffer,(CC_LONG)readBytesCount);
break;
}
case THHashKindSha1:
{
CC_SHA1_Update(CTXPoint,(const void *)buffer,(CC_LONG)readBytesCount);
break;
}
case THHashKindSha256:
{
CC_SHA256_Update(CTXPoint,(const void *)buffer,(CC_LONG)readBytesCount);
break;
}
case THHashKindSha512:
{
CC_SHA512_Update(CTXPoint,(const void *)buffer,(CC_LONG)readBytesCount);
break;
}
}
}
unsigned char *digest = NULL;
NSUInteger digestLength = 0;
switch (hashKind)
{
case THHashKindMd5:
{
digestLength = CC_MD5_DIGEST_LENGTH;
digest = (u_char *)calloc(1, digestLength);
CC_MD5_Final(digest, CTXPoint);
break;
}
case THHashKindSha1:
{
digestLength = CC_SHA1_DIGEST_LENGTH;
digest = (u_char *)calloc(1, digestLength);
CC_SHA1_Final(digest, CTXPoint);
break;
}
case THHashKindSha256:
{
digestLength = CC_SHA256_DIGEST_LENGTH;
digest = (u_char *)calloc(1, digestLength);
CC_SHA256_Final(digest, CTXPoint);
break;
}
case THHashKindSha512:
{
digestLength = CC_SHA512_DIGEST_LENGTH;
digest = (u_char *)calloc(1, digestLength);
CC_SHA512_Final(digest, CTXPoint);
break;
}
}
// Compute the string result
NSMutableString *hashString = [NSMutableString string];
for (size_t i = 0; i < digestLength; ++i)
{
[hashString appendFormat:@"%02x",digest[i]];
}
[inputStream close];
free(digest);
free(CTXPoint);
return hashString;
}
+ (NSData *)hashData:(NSData *)data with:(THHashKind)hashKind
{
if (!data)
{
return nil;
}
const char *cStr = [data bytes];
unsigned char *digest = NULL;
NSUInteger digestLength = 0;
switch (hashKind)
{
case THHashKindMd5:
{
digestLength = CC_MD5_DIGEST_LENGTH;
digest = (u_char *)calloc(1, digestLength);
CC_MD5(cStr, (uint32_t)data.length, digest);
break;
}
case THHashKindSha1:
{
digestLength = CC_SHA1_DIGEST_LENGTH;
digest = (u_char *)calloc(1, digestLength);
CC_SHA1(cStr, (uint32_t)data.length, digest);
break;
}
case THHashKindSha256:
{
digestLength = CC_SHA256_DIGEST_LENGTH;
digest = (u_char *)calloc(1, digestLength);
CC_SHA256(cStr, (uint32_t)data.length, digest);
break;
}
case THHashKindSha512:
{
digestLength = CC_SHA512_DIGEST_LENGTH;
digest = (u_char *)calloc(1, digestLength);
CC_SHA512(cStr, (uint32_t)data.length, digest);
break;
}
default:
{
return nil;
break;
}
}
NSMutableString *hashString = [NSMutableString string];
for (size_t i = 0; i < digestLength; ++i)
{
[hashString appendFormat:@"%02x",digest[i]];
}
free(digest);
NSData *hash = [[NSData alloc] initWithBytes:digest length:digestLength];
return hash;
}
+ (NSString *)hashString:(NSString *)string with:(THHashKind)hashKind
{
NSData *data = [string dataUsingEncoding:NSUTF8StringEncoding];
if (!data)
{
return nil;
}
NSData *resultData = [self hashData:data with:hashKind];
NSMutableString *hashString = [NSMutableString string];
const unsigned char *digest = [resultData bytes];
for (size_t i = 0; i< [resultData length]; i++)
{
[hashString appendFormat:@"%02x",digest[i]];
}
return hashString;
}
#pragma mark -
#pragma mark HMAC
+ (NSData *)hMacData:(NSData *)data withSecretKey:(NSString *)secretKey withHashKind:(THHashKind)hashKind
{
if (!data || !secretKey)
{
return nil;
}
CCHmacAlgorithm algorithm;
NSUInteger digestLength;
switch (hashKind)
{
case THHashKindMd5:
{
digestLength = CC_MD5_DIGEST_LENGTH;
algorithm = kCCHmacAlgMD5;
break;
}
case THHashKindSha1:
{
digestLength = CC_SHA1_DIGEST_LENGTH;
algorithm = kCCHmacAlgSHA1;
break;
}
case THHashKindSha256:
{
digestLength = CC_SHA256_DIGEST_LENGTH;
algorithm = kCCHmacAlgSHA256;
break;
}
case THHashKindSha512:
{
digestLength = CC_SHA512_DIGEST_LENGTH;
algorithm = kCCHmacAlgSHA512;
break;
}
default:
{
return nil;
break;
}
}
const char *cKey = [secretKey cStringUsingEncoding:NSUTF8StringEncoding];
unsigned char cHMAC[digestLength];
CCHmac(algorithm, cKey, strlen(cKey), data.bytes, data.length, cHMAC);
NSData *hash = [[NSData alloc] initWithBytes:cHMAC length:digestLength];
return hash;
}
+ (NSString *)hMacString:(NSString *)string withSecretKey:(NSString *)secretKey withHashKind:(THHashKind)hashKind
{
NSData *data = [string dataUsingEncoding:NSUTF8StringEncoding];
if (!data || !secretKey)
{
return nil;
}
NSData *hashData = [self hMacData:data withSecretKey:secretKey withHashKind:hashKind];
return [[NSString alloc] initWithData:hashData encoding:NSUTF8StringEncoding];
}
@end