Encryption size

Encryption size
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Subject Author Date
Encryption size frank 10-25-2005
|--> Re: Encryption size Lassi Hippeläin...10-25-2005
Posted by frank on October 25, 2005, 3:13 am
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Hi,

Can anyone tell me what size a 16-byte MD5 or 20-byte SHA-1 message
digest will encrypt to using the RSA algorithm? Will they still be 16
bytes or 20 bytes respectively? Or will they get any larger?

Many thanks,
F.



Posted by Lassi Hippeläinen on October 25, 2005, 3:16 pm
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frank wrote:

> Hi,
>
> Can anyone tell me what size a 16-byte MD5 or 20-byte SHA-1 message
> digest will encrypt to using the RSA algorithm? Will they still be 16
> bytes or 20 bytes respectively? Or will they get any larger?
>
> Many thanks,
> F.

They will be rounded up to the next full block. The block size is one design
parameter that you can choose within some limits.

-- Lassi



Posted by Volker Birk on October 30, 2005, 3:12 pm
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> Can anyone tell me what size a 16-byte MD5 or 20-byte SHA-1 message
> digest will encrypt to using the RSA algorithm? Will they still be 16
> bytes or 20 bytes respectively? Or will they get any larger?

This is implementation specific AFAICS, see:

http://www.di-mgt.com.au/rsa_alg.html

Yours,
VB.
--
"Ich bin ein freier Mensch und werde jetzt von meinen Freiheitsrechten
Gebrauch machen - und zwar ausgiebig - natürlich nur in dem Rahmen, den
Otto Schily mir noch zur Verfügung stellt."
Wolfgang Clement am 10.10.05 als Noch-Superminister


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