//
//  MD5.m
//  IOSDuoduo
//
//  Created by 东邪 on 14-5-23.
//  Copyright (c) 2014年 dujia. All rights reserved.
//

#import "MD5.h"
#import <CommonCrypto/CommonDigest.h>

@implementation MD5

+(NSString *) getMD5:(NSString *)originalString {
	const char *cStr = [originalString UTF8String];
	unsigned char result[CC_MD5_DIGEST_LENGTH];
	CC_MD5( cStr, strlen(cStr), result );
	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]
			]uppercaseString];
}



//使用MD5加密
+(NSString*)fileMD5:(NSString*)path
{
    NSFileHandle *handle = [NSFileHandle fileHandleForReadingAtPath:path];
    if( handle== nil ) return nil; // file didnt exist
    
    CC_MD5_CTX md5;
    
    CC_MD5_Init(&md5);
    
    BOOL done = NO;
    while(!done)
    {
        NSData* fileData = [handle readDataOfLength:256];
        CC_MD5_Update(&md5, [fileData bytes], [fileData length]);
        if( [fileData length] == 0 ) done = YES;
    }
    unsigned char digest[CC_MD5_DIGEST_LENGTH];
    CC_MD5_Final(digest, &md5);
    NSString* s = [NSString stringWithFormat: @"%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x",
                   digest[0], digest[1],
                   digest[2], digest[3],
                   digest[4], digest[5],
                   digest[6], digest[7],
                   digest[8], digest[9],
                   digest[10], digest[11],
                   digest[12], digest[13],
                   digest[14], digest[15]];
    return s;
}
@end
