Re: Maximum length in octets of messages that can be hashed

[Russ Housley <housley@xxxxxxxxxxxx>]

Look at the message padding section of the SHA-1 algorithm 
specification.  The length of the "original message" is encoded in 
the padding.  The technique places an upper bound on the number of 
bits that can be hashed.

Russ

At 08:14 AM 3/5/2009, Maxim Masiutin wrote:

> Hello Ietf-Smime,
>
>   Secion 3.6.1 of "SEC 1: Elliptic Curve Cryptography" 
> http://www.secg.org/download/aid-385/sec1_final.pdf defines
>
> "hashmaxlen" as "the maximum length in octets of messages that can 
> be hashed using Hash".
>
>   Where can I find the maximum lenght of message for SHA-1, 
> SHA-224(etc). I've searched through fip180-1 and didn't find any 
> limitation. ANSI-X9.63 also imposes the limitation. Why then the 
> authors ANSI-X9.63 did define the hashmaxlen limitation if there is 
> no such limitation practically?
>
> --
> Best regards,
> Maxim Masiutin                          mailto:max@xxxxxxxxxxx