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/*
* Copyright (C) 2008 Martin Willi
* Hochschule fuer Technik Rapperswil
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*/
/**
* @defgroup keymat keymat
* @{ @ingroup sa
*/
#ifndef KEYMAT_H_
#define KEYMAT_H_
#include <library.h>
#include <utils/identification.h>
#include <crypto/prfs/prf.h>
#include <crypto/crypters/crypter.h>
#include <crypto/signers/signer.h>
#include <config/proposal.h>
#include <sa/ike_sa_id.h>
typedef struct keymat_t keymat_t;
/**
* Derivation an management of sensitive keying material.
*/
struct keymat_t {
/**
* Create a diffie hellman object for key agreement.
*
* The diffie hellman is either for IKE negotiation/rekeying or
* CHILD_SA rekeying (using PFS). The resulting DH object must be passed
* to derive_keys or to derive_child_keys and destroyed after use
*
* @param group diffie hellman group
* @return DH object, NULL if group not supported
*/
diffie_hellman_t* (*create_dh)(keymat_t *this, diffie_hellman_group_t group);
/**
* Derive keys for the IKE_SA.
*
* These keys are not handed out, but are used by the associated signers,
* crypters and authentication functions.
*
* @param proposal selected algorithms
* @param dh diffie hellman key allocated by create_dh()
* @param nonce_i initiators nonce value
* @param nonce_r responders nonce value
* @param id IKE_SA identifier
* @param rekey_prf PRF of old SA if rekeying, PRF_UNDEFINED otherwise
* @param rekey_sdk SKd of old SA if rekeying
* @return TRUE on success
*/
bool (*derive_ike_keys)(keymat_t *this, proposal_t *proposal,
diffie_hellman_t *dh, chunk_t nonce_i,
chunk_t nonce_r, ike_sa_id_t *id,
pseudo_random_function_t rekey_function,
chunk_t rekey_skd);
/**
* Derive keys for a CHILD_SA.
*
* The keys for the CHILD_SA are allocated in the integ and encr chunks.
* An implementation might hand out encrypted keys only, which are
* decrypted in the kernel before use.
* If no PFS is used for the CHILD_SA, dh can be NULL.
*
* @param proposal selected algorithms
* @param dh diffie hellman key allocated by create_dh(), or NULL
* @param nonce_i initiators nonce value
* @param nonce_r responders nonce value
* @param encr_i chunk to write initiators encryption key to
* @param integ_i chunk to write initiators integrity key to
* @param encr_r chunk to write responders encryption key to
* @param integ_r chunk to write responders integrity key to
* @return TRUE on success
*/
bool (*derive_child_keys)(keymat_t *this,
proposal_t *proposal, diffie_hellman_t *dh,
chunk_t nonce_i, chunk_t nonce_r,
chunk_t *encr_i, chunk_t *integ_i,
chunk_t *encr_r, chunk_t *integ_r);
/**
* Get SKd to pass to derive_ikey_keys() during rekeying.
*
* @param skd chunk to write SKd to (internal data)
* @return PRF function to derive keymat
*/
pseudo_random_function_t (*get_skd)(keymat_t *this, chunk_t *skd);
/**
* Get a signer to sign/verify IKE messages.
*
* @param in TRUE for inbound (verify), FALSE for outbound (sign)
* @return signer
*/
signer_t* (*get_signer)(keymat_t *this, bool in);
/*
* Get a crypter to en-/decrypt IKE messages.
*
* @param in TRUE for inbound (decrypt), FALSE for outbound (encrypt)
* @return crypter
*/
crypter_t* (*get_crypter)(keymat_t *this, bool in);
/**
* Generate octets to use for authentication procedure (RFC4306 2.15).
*
* This method creates the plain octets and is usually signed by a private
* key. PSK and EAP authentication include a secret into the data, use
* the get_psk_sig() method instead.
*
* @param verify TRUE to create for verfification, FALSE to sign
* @param ike_sa_init encoded ike_sa_init message
* @param nonce nonce value
* @param id identity
* @return authentication octets
*/
chunk_t (*get_auth_octets)(keymat_t *this, bool verify, chunk_t ike_sa_init,
chunk_t nonce, identification_t *id);
/**
* Build the shared secret signature used for PSK and EAP authentication.
*
* This method wraps the get_auth_octets() method and additionally
* includes the secret into the signature. If no secret is given, SK_p is
* used as secret (used for EAP methods without MSK).
*
* @param verify TRUE to create for verfification, FALSE to sign
* @param ike_sa_init encoded ike_sa_init message
* @param nonce nonce value
* @param secret optional secret to include into signature
* @param id identity
* @return signature octets
*/
chunk_t (*get_psk_sig)(keymat_t *this, bool verify, chunk_t ike_sa_init,
chunk_t nonce, chunk_t secret, identification_t *id);
/**
* Destroy a keymat_t.
*/
void (*destroy)(keymat_t *this);
};
/**
* Create a keymat instance.
*
* @param initiator TRUE if we are the initiator
* @return keymat instance
*/
keymat_t *keymat_create(bool initiator);
#endif /** KEYMAT_H_ @}*/
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