Re: [TLS] About the key block generation for different ciphers.
Marsh Ray <marsh@extendedsubset.com> Tue, 04 October 2011 15:04 UTC
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Date: Tue, 04 Oct 2011 10:07:25 -0500
From: Marsh Ray <marsh@extendedsubset.com>
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To: nilesh <nilesh.tayade@netscout.com>
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Cc: tls@ietf.org
Subject: Re: [TLS] About the key block generation for different ciphers.
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On 10/04/2011 06:38 AM, nilesh wrote: > > Could someone please advice any reference on how to get the key_block > details for a give cipher suit? http://tools.ietf.org/html/rfc2246 TLS 1.0: > 6.3. Key calculation ... > Then the key_block is > partitioned as follows: > > client_write_MAC_secret[SecurityParameters.hash_size] > server_write_MAC_secret[SecurityParameters.hash_size] > client_write_key[SecurityParameters.key_material_length] > server_write_key[SecurityParameters.key_material_length] > client_write_IV[SecurityParameters.IV_size] > server_write_IV[SecurityParameters.IV_size] > > The client_write_IV and server_write_IV are only generated for non- > export block ciphers. For exportable block ciphers, the > initialization vectors are generated later, as described below. Any > extra key_block material is discarded. - Marsh