Re: Fast hash of NSData?
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
>
>
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