SILC_FSM_STATE(silc_ske_st_initiator_start);
SILC_FSM_STATE(silc_ske_st_initiator_phase1);
SILC_FSM_STATE(silc_ske_st_initiator_phase2);
+SILC_FSM_STATE(silc_ske_st_initiator_phase2_send);
SILC_FSM_STATE(silc_ske_st_initiator_phase3);
SILC_FSM_STATE(silc_ske_st_initiator_phase4);
+SILC_FSM_STATE(silc_ske_st_initiator_phase5);
SILC_FSM_STATE(silc_ske_st_initiator_end);
SILC_FSM_STATE(silc_ske_st_initiator_aborted);
SILC_FSM_STATE(silc_ske_st_initiator_error);
SILC_FSM_STATE(silc_ske_st_responder_phase2);
SILC_FSM_STATE(silc_ske_st_responder_phase4);
SILC_FSM_STATE(silc_ske_st_responder_phase5);
+SILC_FSM_STATE(silc_ske_st_responder_phase5_send);
SILC_FSM_STATE(silc_ske_st_responder_end);
SILC_FSM_STATE(silc_ske_st_responder_aborted);
SILC_FSM_STATE(silc_ske_st_responder_failure);
static void silc_ske_abort(SilcAsyncOperation op, void *context)
{
SilcSKE ske = context;
+ if (ske->key_op)
+ silc_async_abort(ske->key_op, NULL, NULL);
ske->aborted = TRUE;
}
SilcMPInt *rnd)
{
SilcSKEStatus status = SILC_SKE_STATUS_OK;
- unsigned char *string;
+ unsigned char string[2048];
SilcUInt32 l;
if (!len)
l = ((len - 1) / 8);
/* Get the random number as string */
- string = silc_rng_get_rn_data(ske->rng, l);
- if (!string)
+ if (!silc_rng_get_rn_data(ske->rng, l, string, sizeof(string)))
return SILC_SKE_STATUS_OUT_OF_MEMORY;
/* Decode the string into a MP integer */
status = SILC_SKE_STATUS_ERROR;
memset(string, 'F', l);
- silc_free(string);
return status;
}
rp->pkcs_alg_len = strlen(rp->pkcs_alg_list);
/* Get supported encryption algorithms */
- rp->enc_alg_list = silc_cipher_get_supported();
+ rp->enc_alg_list = silc_cipher_get_supported(TRUE);
rp->enc_alg_len = strlen(rp->enc_alg_list);
/* Get supported hash algorithms */
silc_fsm_continue_sync(&ske->fsm);
}
+/* Initiator signature callback */
+
+static void silc_ske_initiator_sign_cb(SilcBool success,
+ const unsigned char *signature,
+ SilcUInt32 signature_len,
+ void *context)
+{
+ SilcSKE ske = context;
+
+ ske->key_op = NULL;
+
+ if (ske->aborted) {
+ silc_fsm_next(&ske->fsm, silc_ske_st_initiator_failure);
+ SILC_FSM_CALL_CONTINUE(&ske->fsm);
+ return;
+ }
+
+ ske->ke1_payload->sign_data = silc_memdup(signature, signature_len);
+ if (ske->ke1_payload->sign_data)
+ ske->ke1_payload->sign_len = signature_len;
+
+ SILC_FSM_CALL_CONTINUE(&ske->fsm);
+}
+
+/* Responder signature callback */
+
+static void silc_ske_responder_sign_cb(SilcBool success,
+ const unsigned char *signature,
+ SilcUInt32 signature_len,
+ void *context)
+{
+ SilcSKE ske = context;
+
+ ske->key_op = NULL;
+
+ if (ske->aborted) {
+ silc_fsm_next(&ske->fsm, silc_ske_st_responder_failure);
+ SILC_FSM_CALL_CONTINUE(&ske->fsm);
+ return;
+ }
+
+ ske->ke2_payload->sign_data = silc_memdup(signature, signature_len);
+ if (ske->ke2_payload->sign_data)
+ ske->ke2_payload->sign_len = signature_len;
+
+ SILC_FSM_CALL_CONTINUE(&ske->fsm);
+}
+
+/* Verify callback */
+
+static void silc_ske_verify_cb(SilcBool success, void *context)
+{
+ SilcSKE ske = context;
+
+ ske->key_op = NULL;
+
+ if (ske->aborted) {
+ if (ske->responder)
+ silc_fsm_next(&ske->fsm, silc_ske_st_responder_failure);
+ else
+ silc_fsm_next(&ske->fsm, silc_ske_st_initiator_failure);
+ SILC_FSM_CALL_CONTINUE(&ske->fsm);
+ return;
+ }
+
+ if (!success) {
+ SILC_LOG_ERROR(("Signature verification failed, incorrect signature"));
+ ske->status = SILC_SKE_STATUS_INCORRECT_SIGNATURE;
+ if (ske->responder)
+ silc_fsm_next(&ske->fsm, silc_ske_st_responder_error);
+ else
+ silc_fsm_next(&ske->fsm, silc_ske_st_initiator_error);
+ SILC_FSM_CALL_CONTINUE(&ske->fsm);
+ return;
+ }
+
+ SILC_LOG_DEBUG(("Signature is Ok"));
+ SILC_FSM_CALL_CONTINUE(&ske->fsm);
+}
+
/******************************* Protocol API *******************************/
/* Allocates new SKE object. */
{
SilcSKE ske = fsm_context;
SilcSKEStatus status;
- SilcBuffer payload_buf;
SilcMPInt *x;
SilcSKEKEPayload payload;
SilcUInt32 pk_len;
silc_mp_init(&payload->x);
silc_mp_pow_mod(&payload->x, &ske->prop->group->generator, x,
&ske->prop->group->group);
+ ske->x = x;
/* Get public key */
- payload->pk_data = silc_pkcs_public_key_encode(ske->public_key, &pk_len);
+ payload->pk_data = silc_pkcs_public_key_encode(NULL, ske->public_key,
+ &pk_len);
if (!payload->pk_data) {
/** Error encoding public key */
silc_mp_uninit(x);
silc_free(x);
+ ske->x = NULL;
silc_mp_uninit(&payload->x);
silc_free(payload);
ske->ke1_payload = NULL;
payload->pk_len = pk_len;
payload->pk_type = silc_pkcs_get_type(ske->public_key);
+ /** Send KE1 packet */
+ silc_fsm_next(fsm, silc_ske_st_initiator_phase2_send);
+
/* Compute signature data if we are doing mutual authentication */
if (ske->private_key && ske->prop->flags & SILC_SKE_SP_FLAG_MUTUAL) {
- unsigned char hash[SILC_HASH_MAXLEN], sign[2048 + 1];
- SilcUInt32 hash_len, sign_len;
+ unsigned char hash[SILC_HASH_MAXLEN];
+ SilcUInt32 hash_len;
SILC_LOG_DEBUG(("We are doing mutual authentication"));
SILC_LOG_DEBUG(("Computing HASH_i value"));
SILC_LOG_DEBUG(("Signing HASH_i value"));
/* Sign the hash value */
- if (!silc_pkcs_sign(ske->private_key, hash, hash_len, sign,
- sizeof(sign) - 1, &sign_len, FALSE, ske->prop->hash)) {
- /** Error computing signature */
- silc_mp_uninit(x);
- silc_free(x);
- silc_mp_uninit(&payload->x);
- silc_free(payload->pk_data);
- silc_free(payload);
- ske->ke1_payload = NULL;
- ske->status = SILC_SKE_STATUS_SIGNATURE_ERROR;
- silc_fsm_next(fsm, silc_ske_st_initiator_error);
- return SILC_FSM_CONTINUE;
- }
- payload->sign_data = silc_memdup(sign, sign_len);
- if (payload->sign_data)
- payload->sign_len = sign_len;
- memset(sign, 0, sizeof(sign));
+ SILC_FSM_CALL(ske->key_op =
+ silc_pkcs_sign_async(ske->private_key, hash, hash_len, FALSE,
+ ske->prop->hash, ske->rng,
+ silc_ske_initiator_sign_cb, ske));
+ /* NOT REACHED */
}
+ return SILC_FSM_CONTINUE;
+}
+
+/* Send KE1 packet */
+
+SILC_FSM_STATE(silc_ske_st_initiator_phase2_send)
+{
+ SilcSKE ske = fsm_context;
+ SilcSKEStatus status;
+ SilcBuffer payload_buf;
+ SilcSKEKEPayload payload;
+
+ SILC_LOG_DEBUG(("Start"));
+
+ payload = ske->ke1_payload;
+
status = silc_ske_payload_ke_encode(ske, payload, &payload_buf);
if (status != SILC_SKE_STATUS_OK) {
/** Error encoding KE payload */
- silc_mp_uninit(x);
- silc_free(x);
silc_mp_uninit(&payload->x);
silc_free(payload->pk_data);
silc_free(payload->sign_data);
return SILC_FSM_CONTINUE;
}
- ske->x = x;
-
- /* Check for backwards compatibility */
-
/* Send the packet. */
if (!silc_ske_packet_send(ske, SILC_PACKET_KEY_EXCHANGE_1, 0,
silc_buffer_data(payload_buf),
SilcSKEKEPayload payload;
unsigned char hash[SILC_HASH_MAXLEN];
SilcUInt32 hash_len;
- int key_len, block_len;
if (ske->aborted) {
/** Aborted */
ske->hash = silc_memdup(hash, hash_len);
ske->hash_len = hash_len;
+ /** Send reply */
+ silc_fsm_next(fsm, silc_ske_st_initiator_phase5);
+
if (ske->prop->public_key) {
SILC_LOG_DEBUG(("Public key is authentic"));
SILC_LOG_DEBUG(("Verifying signature (HASH)"));
/* Verify signature */
- if (!silc_pkcs_verify(ske->prop->public_key, payload->sign_data,
- payload->sign_len, hash, hash_len, NULL)) {
- SILC_LOG_ERROR(("Signature verification failed, incorrect signature"));
- status = SILC_SKE_STATUS_INCORRECT_SIGNATURE;
- goto err;
- }
+ SILC_FSM_CALL(ske->key_op =
+ silc_pkcs_verify_async(ske->prop->public_key,
+ payload->sign_data,
+ payload->sign_len, hash,
+ hash_len, FALSE, NULL,
+ silc_ske_verify_cb, ske));
+ /* NOT REACHED */
+ }
+ err:
+ memset(hash, 'F', sizeof(hash));
+ silc_ske_payload_ke_free(payload);
+ ske->ke2_payload = NULL;
+
+ silc_mp_uninit(ske->KEY);
+ silc_free(ske->KEY);
+ ske->KEY = NULL;
- SILC_LOG_DEBUG(("Signature is Ok"));
- memset(hash, 'F', hash_len);
+ if (ske->hash) {
+ memset(ske->hash, 'F', hash_len);
+ silc_free(ske->hash);
+ ske->hash = NULL;
}
+ if (status == SILC_SKE_STATUS_OK)
+ status = SILC_SKE_STATUS_ERROR;
+
+ /** Error */
+ ske->status = status;
+ silc_fsm_next(fsm, silc_ske_st_initiator_error);
+ return SILC_FSM_CONTINUE;
+}
+
+/* Process key material */
+
+SILC_FSM_STATE(silc_ske_st_initiator_phase5)
+{
+ SilcSKE ske = fsm_context;
+ SilcSKEStatus status;
+ unsigned char tmp[4];
+ SilcUInt32 hash_len;
+ int key_len, block_len;
+
ske->status = SILC_SKE_STATUS_OK;
/* In case we are doing rekey move to finish it. */
if (!ske->keymat) {
SILC_LOG_ERROR(("Error processing key material"));
status = SILC_SKE_STATUS_ERROR;
- goto err;
+ silc_fsm_next(fsm, silc_ske_st_initiator_error);
+ return SILC_FSM_CONTINUE;
}
/* Send SUCCESS packet */
- SILC_PUT32_MSB((SilcUInt32)SILC_SKE_STATUS_OK, hash);
- if (!silc_ske_packet_send(ske, SILC_PACKET_SUCCESS, 0, hash, 4)) {
+ SILC_PUT32_MSB((SilcUInt32)SILC_SKE_STATUS_OK, tmp);
+ if (!silc_ske_packet_send(ske, SILC_PACKET_SUCCESS, 0, tmp, 4)) {
/** Error sending packet */
SILC_LOG_DEBUG(("Error sending packet"));
ske->status = SILC_SKE_STATUS_ERROR;
/** Waiting completion */
silc_fsm_next(fsm, silc_ske_st_initiator_end);
return SILC_FSM_WAIT;
-
- err:
- memset(hash, 'F', sizeof(hash));
- silc_ske_payload_ke_free(payload);
- ske->ke2_payload = NULL;
-
- silc_mp_uninit(ske->KEY);
- silc_free(ske->KEY);
- ske->KEY = NULL;
-
- if (ske->hash) {
- memset(ske->hash, 'F', hash_len);
- silc_free(ske->hash);
- ske->hash = NULL;
- }
-
- if (status == SILC_SKE_STATUS_OK)
- status = SILC_SKE_STATUS_ERROR;
-
- /** Error */
- ske->status = status;
- silc_fsm_next(fsm, silc_ske_st_initiator_error);
- return SILC_FSM_CONTINUE;
}
/* Protocol completed */
SilcSKE ske = fsm_context;
SilcUInt32 error = SILC_SKE_STATUS_ERROR;
- if (ske->packet && silc_buffer_len(&ske->packet->buffer) == 4) {
+ if (ske->packet && ske->packet->type == SILC_PACKET_FAILURE &&
+ silc_buffer_len(&ske->packet->buffer) == 4) {
SILC_GET32_MSB(error, ske->packet->buffer.data);
ske->status = error;
silc_packet_free(ske->packet);
return SILC_FSM_CONTINUE;
}
-/* Phase-4. Generate KE2 payload */
+/* Phase-4. Generate KE2 payload, verify signature */
SILC_FSM_STATE(silc_ske_st_responder_phase4)
{
SilcSKE ske = fsm_context;
SilcSKEStatus status;
- SilcSKEKEPayload recv_payload, send_payload;
- SilcMPInt *x, *KEY;
+ SilcSKEKEPayload recv_payload;
if (ske->aborted) {
/** Aborted */
recv_payload = ske->ke1_payload;
+ /** Send KE2 packet */
+ silc_fsm_next(fsm, silc_ske_st_responder_phase5);
+
/* The public key verification was performed only if the Mutual
Authentication flag is set. */
if (ske->start_payload &&
SILC_LOG_DEBUG(("Verifying signature (HASH_i)"));
/* Verify signature */
- if (!silc_pkcs_verify(ske->prop->public_key, recv_payload->sign_data,
- recv_payload->sign_len, hash, hash_len, NULL)) {
- /** Incorrect signature */
- SILC_LOG_ERROR(("Signature verification failed, incorrect signature"));
- ske->status = SILC_SKE_STATUS_INCORRECT_SIGNATURE;
- silc_fsm_next(fsm, silc_ske_st_responder_error);
- return SILC_FSM_CONTINUE;
- }
+ SILC_FSM_CALL(ske->key_op =
+ silc_pkcs_verify_async(ske->prop->public_key,
+ recv_payload->sign_data,
+ recv_payload->sign_len,
+ hash, hash_len, FALSE, NULL,
+ silc_ske_verify_cb, ske));
+ /* NOT REACHED */
+ }
- SILC_LOG_DEBUG(("Signature is Ok"));
+ return SILC_FSM_CONTINUE;
+}
- memset(hash, 'F', hash_len);
- }
+/* Phase-5. Send KE2 payload */
+
+SILC_FSM_STATE(silc_ske_st_responder_phase5)
+{
+ SilcSKE ske = fsm_context;
+ SilcSKEStatus status;
+ unsigned char hash[SILC_HASH_MAXLEN], *pk;
+ SilcUInt32 hash_len, pk_len;
+ SilcMPInt *x, *KEY;
+ SilcSKEKEPayload send_payload;
+
+ SILC_LOG_DEBUG(("Start"));
/* Create the random number x, 1 < x < q. */
x = silc_calloc(1, sizeof(*x));
&ske->prop->group->group);
ske->KEY = KEY;
- /** Send KE2 payload */
- silc_fsm_next(fsm, silc_ske_st_responder_phase5);
- return SILC_FSM_CONTINUE;
-}
-
-/* Phase-5. Send KE2 payload */
-
-SILC_FSM_STATE(silc_ske_st_responder_phase5)
-{
- SilcSKE ske = fsm_context;
- SilcSKEStatus status;
- SilcBuffer payload_buf;
- unsigned char hash[SILC_HASH_MAXLEN], sign[2048 + 1], *pk;
- SilcUInt32 hash_len, sign_len, pk_len;
-
- SILC_LOG_DEBUG(("Start"));
-
if (ske->public_key && ske->private_key) {
SILC_LOG_DEBUG(("Getting public key"));
/* Get the public key */
- pk = silc_pkcs_public_key_encode(ske->public_key, &pk_len);
+ pk = silc_pkcs_public_key_encode(NULL, ske->public_key, &pk_len);
if (!pk) {
/** Error encoding public key */
status = SILC_SKE_STATUS_OUT_OF_MEMORY;
ske->hash = silc_memdup(hash, hash_len);
ske->hash_len = hash_len;
+ /** Send KE2 packet */
+ silc_fsm_next(fsm, silc_ske_st_responder_phase5_send);
+
if (ske->public_key && ske->private_key) {
SILC_LOG_DEBUG(("Signing HASH value"));
/* Sign the hash value */
- if (!silc_pkcs_sign(ske->private_key, hash, hash_len, sign,
- sizeof(sign) - 1, &sign_len, FALSE, ske->prop->hash)) {
- /** Error computing signature */
- status = SILC_SKE_STATUS_SIGNATURE_ERROR;
- silc_fsm_next(fsm, silc_ske_st_responder_error);
- return SILC_FSM_CONTINUE;
- }
- ske->ke2_payload->sign_data = silc_memdup(sign, sign_len);
- ske->ke2_payload->sign_len = sign_len;
- memset(sign, 0, sizeof(sign));
+ SILC_FSM_CALL(ske->key_op =
+ silc_pkcs_sign_async(ske->private_key, hash, hash_len, FALSE,
+ ske->prop->hash, ske->rng,
+ silc_ske_responder_sign_cb, ske));
+ /* NOT REACHED */
}
+
+ return SILC_FSM_CONTINUE;
+}
+
+/* Send KE2 packet */
+
+SILC_FSM_STATE(silc_ske_st_responder_phase5_send)
+{
+ SilcSKE ske = fsm_context;
+ SilcSKEStatus status;
+ SilcBuffer payload_buf;
+
ske->ke2_payload->pk_type = silc_pkcs_get_type(ske->public_key);
/* Encode the Key Exchange Payload */
SILC_LOG_DEBUG(("Key exchange protocol failed"));
- if (ske->packet && silc_buffer_len(&ske->packet->buffer) == 4) {
+ if (ske->packet && ske->packet->type == SILC_PACKET_FAILURE &&
+ silc_buffer_len(&ske->packet->buffer) == 4) {
SILC_GET32_MSB(error, ske->packet->buffer.data);
ske->status = error;
silc_packet_free(ske->packet);
projects / silc.git / blobdiff