ios根據文件路徑，將文件進行MD5加密

1、導入頭文件 

#import <CommonCrypto/CommonDigest.h>

-(NSString *)getMD5:(NSString *)path {
    
    NSFileHandle *handle = [NSFileHandle fileHandleForReadingAtPath:path];
    if( handle== nil ) {
        return nil;
    }
    CC_MD5_CTX md5;
    CC_MD5_Init(&md5);
    BOOL done = NO;
    while(!done)
    {
        NSData* fileData = [handle readDataOfLength: 256 ];
        CC_MD5_Update(&md5, [fileData bytes], (unsigned)[fileData length]);
        //        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;
}