Martin Willi
e5d73b0dfa
The salt, or often called implicit nonce, varies between AEAD algorithms and their use in protocols. For IKE and ESP, GCM uses 4 bytes, while CCM uses 3 bytes. With TLS, however, AEAD mode uses 4 bytes for both GCM and CCM. Our GCM backends currently support 4 bytes and CCM 3 bytes only. This is fine until we go for CCM mode support in TLS, which requires 4 byte nonces.
40 lines
1.2 KiB
C
40 lines
1.2 KiB
C
/*
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* Copyright (C) 2013 Tobias Brunner
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* Hochschule fuer Technik Rapperswil
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*/
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/**
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* Implements the aead_t interface using OpenSSL in GCM mode.
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*
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* @defgroup openssl_gcm openssl_gcm
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* @{ @ingroup openssl_p
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*/
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#ifndef OPENSSL_GCM_H_
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#define OPENSSL_GCM_H_
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#include <crypto/aead.h>
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/**
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* Constructor to create aead_t implementation.
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*
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* @param algo algorithm to implement
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* @param key_size key size in bytes
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* @param salt_size size of implicit salt length
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* @return aead_t object, NULL if not supported
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*/
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aead_t *openssl_gcm_create(encryption_algorithm_t algo, size_t key_size,
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size_t salt_size);
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#endif /** OPENSSL_GCM_H_ @}*/
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