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Use a dedicated PRF for HASH/SIG payloads using ECDSA specific hasher

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This commit is contained in:
Martin Willi
2012-03-20 17:31:39 +01:00
parent 4c685e8850
commit a0c17d4157
1 changed files with 37 additions and 14 deletions
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src/libcharon/sa/ikev1/keymat_v1.c
+37 -14
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@@ -65,9 +65,9 @@ struct private_keymat_v1_t {
prf_t *prf;
/**
* Negotiated PRF algorithm
* PRF to create Phase 1 HASH payloads
*/
pseudo_random_function_t prf_alg;
prf_t *prf_auth;
/**
* Crypter wrapped in an aead_t interface
@@ -366,6 +366,7 @@ METHOD(keymat_v1_t, derive_ike_keys, bool,
auth_method_t auth, shared_key_t *shared_key)
{
chunk_t g_xy, g_xi, g_xr, dh_me, spi_i, spi_r, nonces, data, skeyid_e;
chunk_t skeyid;
u_int16_t alg;
spi_i = chunk_alloca(sizeof(u_int64_t));
@@ -381,7 +382,6 @@ METHOD(keymat_v1_t, derive_ike_keys, bool,
return FALSE;
}
}
this->prf_alg = alg;
this->prf = lib->crypto->create_prf(lib->crypto, alg);
if (!this->prf)
{
@@ -423,7 +423,7 @@ METHOD(keymat_v1_t, derive_ike_keys, bool,
psk = shared_key->get_key(shared_key);
adjust_keylen(alg, &psk);
this->prf->set_key(this->prf, psk);
this->prf->allocate_bytes(this->prf, nonces, &this->skeyid);
this->prf->allocate_bytes(this->prf, nonces, &skeyid);
break;
}
case AUTH_RSA:
@@ -436,7 +436,7 @@ METHOD(keymat_v1_t, derive_ike_keys, bool,
case AUTH_HYBRID_RESP_RSA:
{
this->prf->set_key(this->prf, nonces);
this->prf->allocate_bytes(this->prf, g_xy, &this->skeyid);
this->prf->allocate_bytes(this->prf, g_xy, &skeyid);
break;
}
default:
@@ -445,32 +445,57 @@ METHOD(keymat_v1_t, derive_ike_keys, bool,
chunk_clear(&g_xy);
return FALSE;
}
adjust_keylen(alg, &this->skeyid);
DBG4(DBG_IKE, "SKEYID %B", &this->skeyid);
adjust_keylen(alg, &skeyid);
DBG4(DBG_IKE, "SKEYID %B", &skeyid);
this->prf->set_key(this->prf, skeyid);
/* SKEYID_d = prf(SKEYID, g^xy | CKY-I | CKY-R | 0) */
data = chunk_cat("cccc", g_xy, spi_i, spi_r, octet_0);
this->prf->set_key(this->prf, this->skeyid);
this->prf->allocate_bytes(this->prf, data, &this->skeyid_d);
chunk_clear(&data);
DBG4(DBG_IKE, "SKEYID_d %B", &this->skeyid_d);
/* SKEYID_a = prf(SKEYID, SKEYID_d | g^xy | CKY-I | CKY-R | 1) */
data = chunk_cat("ccccc", this->skeyid_d, g_xy, spi_i, spi_r, octet_1);
this->prf->set_key(this->prf, this->skeyid);
this->prf->allocate_bytes(this->prf, data, &this->skeyid_a);
chunk_clear(&data);
DBG4(DBG_IKE, "SKEYID_a %B", &this->skeyid_a);
/* SKEYID_e = prf(SKEYID, SKEYID_a | g^xy | CKY-I | CKY-R | 2) */
data = chunk_cat("ccccc", this->skeyid_a, g_xy, spi_i, spi_r, octet_2);
this->prf->set_key(this->prf, this->skeyid);
this->prf->allocate_bytes(this->prf, data, &skeyid_e);
chunk_clear(&data);
DBG4(DBG_IKE, "SKEYID_e %B", &skeyid_e);
chunk_clear(&g_xy);
switch (auth)
{
case AUTH_ECDSA_256:
alg = PRF_HMAC_SHA2_256;
break;
case AUTH_ECDSA_384:
alg = PRF_HMAC_SHA2_384;
break;
case AUTH_ECDSA_521:
alg = PRF_HMAC_SHA2_512;
break;
default:
/* use proposal algorithm */
break;
}
this->prf_auth = lib->crypto->create_prf(lib->crypto, alg);
if (!this->prf_auth)
{
DBG1(DBG_IKE, "%N %N not supported!",
transform_type_names, PSEUDO_RANDOM_FUNCTION,
pseudo_random_function_names, alg);
chunk_clear(&skeyid);
return FALSE;
}
this->prf_auth->set_key(this->prf_auth, skeyid);
chunk_clear(&skeyid);
this->aead = create_aead(proposal, this->prf, skeyid_e);
if (!this->aead)
{
@@ -667,8 +692,7 @@ METHOD(keymat_v1_t, get_hash, chunk_t,
DBG3(DBG_IKE, "HASH_%c data %B", initiator ? 'I' : 'R', &data);
this->prf->set_key(this->prf, this->skeyid);
this->prf->allocate_bytes(this->prf, data, &hash);
this->prf_auth->allocate_bytes(this->prf_auth, data, &hash);
DBG3(DBG_IKE, "HASH_%c %B", initiator ? 'I' : 'R', &hash);
@@ -971,9 +995,9 @@ METHOD(keymat_t, destroy, void,
private_keymat_v1_t *this)
{
DESTROY_IF(this->prf);
DESTROY_IF(this->prf_auth);
DESTROY_IF(this->aead);
DESTROY_IF(this->hasher);
chunk_clear(&this->skeyid);
chunk_clear(&this->skeyid_d);
chunk_clear(&this->skeyid_a);
chunk_free(&this->phase1_iv.iv);
@@ -1011,7 +1035,6 @@ keymat_v1_t *keymat_v1_create(bool initiator)
.ivs = linked_list_create(),
.qms = linked_list_create(),
.initiator = initiator,
.prf_alg = PRF_UNDEFINED,
);
return &this->public;