Subject: [Ipsec] RFC 4306 - Pseudorandom function

From: Thomas Otto <[email-masked]>
Date: Sun, 15 Jan 2006 09:49:03 +0100

Hi all, 

IKEv2 (RFC 4306) does not explicitely give an algorithm for prf, only
for its iterated version. 

<snip>
   prf+ (K,S) = T1 | T2 | T3 | T4 | ...

   where:
   T1 = prf (K, S | 0x01)
   T2 = prf (K, T1 | S | 0x02)
   T3 = prf (K, T2 | S | 0x03)
   T4 = prf (K, T3 | S | 0x04)
</snip>

Is a single iteration prf(K,S) or prf(K,S | 0x01) ? 

Thomas

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