RE: ESP Transport Mode Encryption Payload

["Joseph D. Harwood" <jharwood@vesta-corp.com>]

Pad Length and Next Header are encrypted.  The total amount of data
encrypted must be a multiple of 8 bytes (DES/3DES), so (Payload Data +
Padding + 2) mod 8 = 0, where (+ 2) accounts for Pad Length and Next Header
(1 byte each).

Best Regards,
Joseph D. Harwood
jharwood@vesta-corp.com
www.vesta-corp.com

> -----Original Message-----
> From: owner-ipsec@lists.tislabs.com
> [mailto:owner-ipsec@lists.tislabs.com]On Behalf Of ranjeet barve
> Sent: Tuesday, June 19, 2001 10:35 PM
> To: ipsec@lists.tislabs.com
> Subject: ESP Transport Mode Encryption Payload
>
>
> Hi,
> While doing the Implementation of ESP in Transport
> mode,I am a bit confused about the amount of Data that
> goes for Encryption.
> Are the Pad Length and Next header fields a part of
> the cipher text along with the Payload?
> Also is the Padding calculated after considering the
> sum of (Payload + Pad Length + Next Header) to make it
> a multiple number of 8 bytes required for encryption
> by DES/3DES-CBC mode?
>
> Please let me know,
>
> Regards,
> Ranjeet Barve.
>
>
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---

References:

• ESP Transport Mode Encryption Payload
• From: ranjeet barve <ranjeet_barve@yahoo.co.in>

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