• Open Menu Close Menu
  • Apple
  • Shopping Bag
  • Apple
  • Mac
  • iPad
  • iPhone
  • Watch
  • TV
  • Music
  • Support
  • Search apple.com
  • Shopping Bag

Lists

Open Menu Close Menu
  • Terms and Conditions
  • Lists hosted on this site
  • Email the Postmaster
  • Tips for posting to public mailing lists
Re: Fast hash of NSData?
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: Fast hash of NSData?


  • Subject: Re: Fast hash of NSData?
  • From: Maxthon Chan <email@hidden>
  • Date: Mon, 02 Dec 2013 22:56:13 +0800

If you are concerned with security, use SHA-512 (member of SHA-2 family, faster than SHA-1 on 64-bit systems) or Keccak (SHA-3, more secure) will be the best way as they are both proved secure (while SHA-1 is proved INSECURE) and if you want efficiency the XOR thing should suite well as it can be implemented with a few instructions.

On Dec 2, 2013, at 22:44, Graham Cox <email@hidden> wrote:

>
> On 2 Dec 2013, at 3:36 pm, ChanMaxthon <email@hidden> wrote:
>
>> How about this: treat the data as an array of 64-bit integers (zero-padded) and XOR them together? That will be really fast and you will be able to asm-optimize it.
>
>
> There are plenty of fast hash algorithms that are proven to work.
>
> As I learned early on, inventing your own without a lot of thought rarely pans out well. The issue now isn’t how to hash, it’s whether hashing is considered a safe enough approach for the use-case.
>
> —Graham
>
>

_______________________________________________

Cocoa-dev mailing list (email@hidden)

Please do not post admin requests or moderator comments to the list.
Contact the moderators at cocoa-dev-admins(at)lists.apple.com

Help/Unsubscribe/Update your Subscription:

This email sent to email@hidden


References: 
 >Re: Fast hash of NSData? (From: "Gerriet M. Denkmann" <email@hidden>)
 >Re: Fast hash of NSData? (From: ChanMaxthon <email@hidden>)
 >Re: Fast hash of NSData? (From: Graham Cox <email@hidden>)
 >Re: Fast hash of NSData? (From: ChanMaxthon <email@hidden>)
 >Re: Fast hash of NSData? (From: Graham Cox <email@hidden>)

  • Prev by Date: Re: Fast hash of NSData?
  • Next by Date: Re: Fast hash of NSData?
  • Previous by thread: Re: Fast hash of NSData?
  • Next by thread: Re: Fast hash of NSData?
  • Index(es):
    • Date
    • Thread