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key-exchange: Add helper to concatenate shared secrets of several key exchanges

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This commit is contained in:
Tobias Brunner 2020-04-09 11:36:30 +02:00
parent ec0ec55070
commit c36eaf42da
2 changed files with 55 additions and 2 deletions
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42
src/libstrongswan/crypto/key_exchange.c
View File

@ -1,5 +1,5 @@
/*
* Copyright (C) 2010-2019 Tobias Brunner
* Copyright (C) 2010-2020 Tobias Brunner
* Copyright (C) 2005-2010 Martin Willi
* Copyright (C) 2005 Jan Hutter
*
@ -619,3 +619,43 @@ bool key_exchange_verify_pubkey(key_exchange_method_t ke, chunk_t value)
}
return valid;
}
/*
* Described in header
*/
bool key_exchange_concat_secrets(array_t *kes, chunk_t *first,
chunk_t *others)
{
key_exchange_t *ke;
chunk_t secret;
int i;
if (!array_count(kes))
{
return FALSE;
}
*first = chunk_empty;
*others = chunk_empty;
for (i = 0; i < array_count(kes); i++)
{
if (array_get(kes, i, &ke) &&
ke->get_shared_secret(ke, &secret))
{
if (i == 0)
{
*first = secret;
}
else
{
*others = chunk_cat("ss", *others, secret);
}
}
else
{
chunk_clear(first);
chunk_clear(others);
return FALSE;
}
}
return TRUE;
}

15
src/libstrongswan/crypto/key_exchange.h
View File

@ -1,5 +1,5 @@
/*
* Copyright (C) 2010-2019 Tobias Brunner
* Copyright (C) 2010-2020 Tobias Brunner
* Copyright (C) 2005-2007 Martin Willi
* Copyright (C) 2005 Jan Hutter
*
@ -29,6 +29,7 @@ typedef struct key_exchange_t key_exchange_t;
typedef struct diffie_hellman_params_t diffie_hellman_params_t;
#include <library.h>
#include <collections/array.h>
/**
* Key exchange method.
@ -209,4 +210,16 @@ bool key_exchange_is_ecdh(key_exchange_method_t ke);
*/
bool key_exchange_verify_pubkey(key_exchange_method_t ke, chunk_t value);
/**
* Return the first shared secret plus the concatenated additional shared
* secrets of all the key exchange methods in the given array.
*
* @param kes array of key_exchange_t*
* @param secret first shared secret (allocated)
* @param add_secret concatenated additional shared secrets (allocated)
* @return TRUE on success
*/
bool key_exchange_concat_secrets(array_t *kes, chunk_t *secret,
chunk_t *add_secret);
#endif /** KEY_EXCHANGE_H_ @}*/