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aead: Create AEAD using traditional transforms with an explicit IV generator

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Real AEADs directly provide a suitable IV generator, but traditional crypters
do not. For some (stream) ciphers, we should use sequential IVs, for which
we pass an appropriate generator to the AEAD wrapper.
This commit is contained in:
Martin Willi
2015-04-13 15:06:15 +02:00
parent a4549e5525
commit 3c81cb6fc3
5 changed files with 34 additions and 12 deletions
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src/charon-tkm/src/tkm/tkm_keymat.c
+11 -4
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@@ -102,6 +102,7 @@ static void aead_create_from_keys(aead_t **in, aead_t **out,
*in = *out = NULL;
signer_t *signer_i, *signer_r;
crypter_t *crypter_i, *crypter_r;
iv_gen_t *ivg_i, *ivg_r;
signer_i = lib->crypto->create_signer(lib->crypto, int_alg);
signer_r = lib->crypto->create_signer(lib->crypto, int_alg);
@@ -145,15 +146,21 @@ static void aead_create_from_keys(aead_t **in, aead_t **out,
return;
}
ivg_i = iv_gen_create_for_alg(enc_alg);
ivg_r = iv_gen_create_for_alg(enc_alg);
if (!ivg_i || !ivg_r)
{
return;
}
if (initiator)
{
*in = aead_create(crypter_r, signer_r);
*out = aead_create(crypter_i, signer_i);
*in = aead_create(crypter_r, signer_r, ivg_r);
*out = aead_create(crypter_i, signer_i, ivg_i);
}
else
{
*in = aead_create(crypter_i, signer_i);
*out = aead_create(crypter_r, signer_r);
*in = aead_create(crypter_i, signer_i, ivg_i);
*out = aead_create(crypter_r, signer_r, ivg_r);
}
}