OC,iphone,把字符串加密成MD5 string

 +(NSString *)createMD5:(NSString *)signString
 {
     const char*cStr =[signString UTF8String];
     unsigned char result[16];
     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]
            ];
 }

 +(NSString*) md5:(NSString*) str
 {
     const char *cStr = [str UTF8String];
     unsigned char result[CC_MD5_DIGEST_LENGTH];
     CC_MD5( cStr, strlen(cStr), result );

     NSMutableString *hash = [NSMutableString string];
     for(int i=0;i<CC_MD5_DIGEST_LENGTH;i++)
     {
         [hash appendFormat:@"%02X",result[i]];
     }
     return [hash lowercaseString];
 }
 #define CHUNK_SIZE 1024
 +(NSString *)file_md5:(NSString*) path
 {
     NSFileHandle* handle = [NSFileHandle fileHandleForReadingAtPath:path];
     if(handle == nil)
         return nil;

     CC_MD5_CTX md5_ctx;
     CC_MD5_Init(&md5_ctx);

     NSData* filedata;
     do {
         filedata = [handle readDataOfLength:CHUNK_SIZE];
         CC_MD5_Update(&md5_ctx, [filedata bytes], [filedata length]);
     }
     while([filedata length]);

     unsigned char result[CC_MD5_DIGEST_LENGTH];
     CC_MD5_Final(result, &md5_ctx);

     [handle closeFile];

     NSMutableString *hash = [NSMutableString string];
     for(int i=0;i<CC_MD5_DIGEST_LENGTH;i++)
     {
         [hash appendFormat:@"%02x",result[i]];
     }
     return [hash lowercaseString];
 }

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