78 lines
1.9 KiB
C
78 lines
1.9 KiB
C
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/*
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* This file Copyright (C) Mnemosyne LLC
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*
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* It may be used under the GNU GPL versions 2 or 3
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* or any future license endorsed by Mnemosyne LLC.
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*
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* $Id$
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*/
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/* This file is designed specifically to be included by other source files to
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implement missing (or duplicate) functionality without exposing internal
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details in header files. */
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#include <assert.h>
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#include "transmission.h"
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#include "crypto-utils.h"
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#include "utils.h"
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/***
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****
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***/
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#ifdef TR_CRYPTO_DH_SECRET_FALLBACK
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/* Most Diffie-Hellman backends handle secret key in the very same way: by
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manually allocating memory for it and storing the value in plain form. */
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struct tr_dh_secret
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{
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size_t key_length;
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uint8_t key[];
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};
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static struct tr_dh_secret *
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tr_dh_secret_new (size_t key_length)
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{
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struct tr_dh_secret * handle = tr_malloc (sizeof (struct tr_dh_secret) + key_length);
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handle->key_length = key_length;
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return handle;
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}
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static void
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tr_dh_secret_align (struct tr_dh_secret * handle,
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size_t current_key_length)
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{
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tr_dh_align_key (handle->key, current_key_length, handle->key_length);
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}
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bool
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tr_dh_secret_derive (tr_dh_secret_t raw_handle,
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const void * prepend_data,
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size_t prepend_data_size,
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const void * append_data,
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size_t append_data_size,
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uint8_t * hash)
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{
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struct tr_dh_secret * handle = raw_handle;
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assert (handle != NULL);
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assert (hash != NULL);
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return tr_sha1 (hash,
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prepend_data == NULL ? "" : prepend_data,
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prepend_data == NULL ? 0 : (int) prepend_data_size,
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handle->key, (int) handle->key_length,
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append_data, append_data == NULL ? 0 : (int) append_data_size,
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NULL);
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}
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void
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tr_dh_secret_free (tr_dh_secret_t handle)
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{
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tr_free (handle);
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}
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#endif /* TR_CRYPTO_DH_SECRET_FALLBACK */
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