static void
perfEncrypt ()
{
unsigned int i;
char buf[64 * 1024];
char rbuf[64 * 1024];
struct GNUNET_CRYPTO_SymmetricSessionKey sk;
struct GNUNET_CRYPTO_SymmetricInitializationVector iv;
GNUNET_CRYPTO_symmetric_create_session_key (&sk);
memset (buf, 1, sizeof (buf));
for (i = 0; i < 1024; i++)
{
memset (&iv, (int8_t) i, sizeof (iv));
GNUNET_CRYPTO_symmetric_encrypt (buf, sizeof (buf),
&sk, &iv,
rbuf);
GNUNET_CRYPTO_symmetric_decrypt (rbuf, sizeof (buf),
&sk, &iv,
buf);
}
memset (rbuf, 1, sizeof (rbuf));
GNUNET_assert (0 == memcmp (rbuf, buf, sizeof (buf)));
}
/**
* Encrypt header with the axolotl header key.
*
* @param t Tunnel whose key to use.
* @param msg Message whose header to encrypt.
*/
static void
t_h_encrypt (struct CadetTunnel *t,
struct GNUNET_CADET_Encrypted *msg)
{
struct GNUNET_CRYPTO_SymmetricInitializationVector iv;
struct CadetTunnelAxolotl *ax;
size_t out_size;
ax = &t->ax;
GNUNET_CRYPTO_symmetric_derive_iv (&iv,
&ax->HKs,
NULL, 0,
NULL);
out_size = GNUNET_CRYPTO_symmetric_encrypt (&msg->Ns,
AX_HEADER_SIZE,
&ax->HKs,
&iv,
&msg->Ns);
GNUNET_assert (AX_HEADER_SIZE == out_size);
}
static int
testSymcipher ()
{
struct GNUNET_CRYPTO_SymmetricSessionKey key;
char result[100];
int size;
char res[100];
GNUNET_CRYPTO_symmetric_create_session_key (&key);
size =
GNUNET_CRYPTO_symmetric_encrypt (TESTSTRING, strlen (TESTSTRING) + 1, &key,
(const struct
GNUNET_CRYPTO_SymmetricInitializationVector *)
INITVALUE, result);
if (size == -1)
{
printf ("symciphertest failed: encryptBlock returned %d\n", size);
return 1;
}
size =
GNUNET_CRYPTO_symmetric_decrypt (result, size, &key,
(const struct
GNUNET_CRYPTO_SymmetricInitializationVector *)
INITVALUE, res);
if (strlen (TESTSTRING) + 1 != size)
{
printf ("symciphertest failed: decryptBlock returned %d\n", size);
return 1;
}
if (0 != strcmp (res, TESTSTRING))
{
printf ("symciphertest failed: %s != %s\n", res, TESTSTRING);
return 1;
}
else
return 0;
}
/**
* Publish a UBlock.
*
* @param h handle to the file sharing subsystem
* @param dsh datastore handle to use for storage operation
* @param label identifier to use
* @param ulabel update label to use, may be an empty string for none
* @param ns namespace to publish in
* @param meta metadata to use
* @param uri URI to refer to in the UBlock
* @param bo per-block options
* @param options publication options
* @param cont continuation
* @param cont_cls closure for @a cont
* @return NULL on error (@a cont will still be called)
*/
struct GNUNET_FS_PublishUblockContext *
GNUNET_FS_publish_ublock_ (struct GNUNET_FS_Handle *h,
struct GNUNET_DATASTORE_Handle *dsh,
const char *label,
const char *ulabel,
const struct GNUNET_CRYPTO_EcdsaPrivateKey *ns,
const struct GNUNET_CONTAINER_MetaData *meta,
const struct GNUNET_FS_Uri *uri,
const struct GNUNET_FS_BlockOptions *bo,
enum GNUNET_FS_PublishOptions options,
GNUNET_FS_UBlockContinuation cont, void *cont_cls)
{
struct GNUNET_FS_PublishUblockContext *uc;
struct GNUNET_HashCode query;
struct GNUNET_CRYPTO_SymmetricInitializationVector iv;
struct GNUNET_CRYPTO_SymmetricSessionKey skey;
struct GNUNET_CRYPTO_EcdsaPrivateKey *nsd;
struct GNUNET_CRYPTO_EcdsaPublicKey pub;
char *uris;
size_t size;
char *kbe;
char *sptr;
ssize_t mdsize;
size_t slen;
size_t ulen;
struct UBlock *ub_plain;
struct UBlock *ub_enc;
/* compute ublock to publish */
if (NULL == meta)
mdsize = 0;
else
mdsize = GNUNET_CONTAINER_meta_data_get_serialized_size (meta);
GNUNET_assert (mdsize >= 0);
uris = GNUNET_FS_uri_to_string (uri);
slen = strlen (uris) + 1;
if (NULL == ulabel)
ulen = 1;
else
ulen = strlen (ulabel) + 1;
size = mdsize + sizeof (struct UBlock) + slen + ulen;
if (size > MAX_UBLOCK_SIZE)
{
size = MAX_UBLOCK_SIZE;
mdsize = size - sizeof (struct UBlock) - (slen + ulen);
}
ub_plain = GNUNET_malloc (size);
kbe = (char *) &ub_plain[1];
if (NULL != ulabel)
memcpy (kbe, ulabel, ulen);
kbe += ulen;
memcpy (kbe, uris, slen);
kbe += slen;
GNUNET_free (uris);
sptr = kbe;
if (NULL != meta)
mdsize =
GNUNET_CONTAINER_meta_data_serialize (meta, &sptr, mdsize,
GNUNET_CONTAINER_META_DATA_SERIALIZE_PART);
if (-1 == mdsize)
{
GNUNET_break (0);
GNUNET_free (ub_plain);
cont (cont_cls, _("Internal error."));
return NULL;
}
size = sizeof (struct UBlock) + slen + mdsize + ulen;
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Publishing under identifier `%s'\n",
label);
/* get public key of the namespace */
GNUNET_CRYPTO_ecdsa_key_get_public (ns,
&pub);
derive_ublock_encryption_key (&skey, &iv,
label, &pub);
/* encrypt ublock */
ub_enc = GNUNET_malloc (size);
GNUNET_CRYPTO_symmetric_encrypt (&ub_plain[1],
ulen + slen + mdsize,
&skey, &iv,
&ub_enc[1]);
GNUNET_free (ub_plain);
ub_enc->purpose.size = htonl (ulen + slen + mdsize +
sizeof (struct UBlock)
- sizeof (struct GNUNET_CRYPTO_EcdsaSignature));
ub_enc->purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_FS_UBLOCK);
/* derive signing-key from 'label' and public key of the namespace */
nsd = GNUNET_CRYPTO_ecdsa_private_key_derive (ns, label, "fs-ublock");
GNUNET_CRYPTO_ecdsa_key_get_public (nsd,
&ub_enc->verification_key);
GNUNET_assert (GNUNET_OK ==
GNUNET_CRYPTO_ecdsa_sign (nsd,
&ub_enc->purpose,
&ub_enc->signature));
GNUNET_CRYPTO_hash (&ub_enc->verification_key,
sizeof (ub_enc->verification_key),
&query);
GNUNET_free (nsd);
uc = GNUNET_new (struct GNUNET_FS_PublishUblockContext);
uc->cont = cont;
uc->cont_cls = cont_cls;
uc->qre =
GNUNET_DATASTORE_put (dsh, 0, &query,
ulen + slen + mdsize + sizeof (struct UBlock),
ub_enc, GNUNET_BLOCK_TYPE_FS_UBLOCK,
bo->content_priority, bo->anonymity_level,
bo->replication_level, bo->expiration_time,
-2, 1, GNUNET_CONSTANTS_SERVICE_TIMEOUT,
&ublock_put_cont, uc);
return uc;
}
/**
* Encrypt data with the axolotl tunnel key.
*
* @param t Tunnel whose key to use.
* @param dst Destination with @a size bytes for the encrypted data.
* @param src Source of the plaintext. Can overlap with @c dst, must contain @a size bytes
* @param size Size of the buffers at @a src and @a dst
*/
static void
t_ax_encrypt (struct CadetTunnel *t,
void *dst,
const void *src,
size_t size)
{
struct GNUNET_CRYPTO_SymmetricSessionKey MK;
struct GNUNET_CRYPTO_SymmetricInitializationVector iv;
struct CadetTunnelAxolotl *ax;
size_t out_size;
ax = &t->ax;
ax->ratchet_counter++;
if ( (GNUNET_YES == ax->ratchet_allowed) &&
( (ratchet_messages <= ax->ratchet_counter) ||
(0 == GNUNET_TIME_absolute_get_remaining (ax->ratchet_expiration).rel_value_us)) )
{
ax->ratchet_flag = GNUNET_YES;
}
if (GNUNET_YES == ax->ratchet_flag)
{
/* Advance ratchet */
struct GNUNET_CRYPTO_SymmetricSessionKey keys[3];
struct GNUNET_HashCode dh;
struct GNUNET_HashCode hmac;
static const char ctx[] = "axolotl ratchet";
new_ephemeral (t);
ax->HKs = ax->NHKs;
/* RK, NHKs, CKs = KDF( HMAC-HASH(RK, DH(DHRs, DHRr)) ) */
GNUNET_CRYPTO_ecc_ecdh (ax->DHRs,
&ax->DHRr,
&dh);
t_ax_hmac_hash (&ax->RK,
&hmac,
&dh,
sizeof (dh));
GNUNET_CRYPTO_kdf (keys, sizeof (keys),
ctx, sizeof (ctx),
&hmac, sizeof (hmac),
NULL);
ax->RK = keys[0];
ax->NHKs = keys[1];
ax->CKs = keys[2];
ax->PNs = ax->Ns;
ax->Ns = 0;
ax->ratchet_flag = GNUNET_NO;
ax->ratchet_allowed = GNUNET_NO;
ax->ratchet_counter = 0;
ax->ratchet_expiration
= GNUNET_TIME_absolute_add (GNUNET_TIME_absolute_get(),
ratchet_time);
}
t_hmac_derive_key (&ax->CKs,
&MK,
"0",
1);
GNUNET_CRYPTO_symmetric_derive_iv (&iv,
&MK,
NULL, 0,
NULL);
out_size = GNUNET_CRYPTO_symmetric_encrypt (src,
size,
&MK,
&iv,
dst);
GNUNET_assert (size == out_size);
t_hmac_derive_key (&ax->CKs,
&ax->CKs,
"1",
1);
}
/**
* We've received an on-demand encoded block from the datastore.
* Attempt to do on-demand encoding and (if successful), call the
* continuation with the resulting block. On error, clean up and ask
* the datastore for more results.
*
* @param key key for the content
* @param size number of bytes in data
* @param data content stored
* @param type type of the content
* @param priority priority of the content
* @param anonymity anonymity-level for the content
* @param expiration expiration time for the content
* @param uid unique identifier for the datum;
* maybe 0 if no unique identifier is available
* @param cont function to call with the actual block (at most once, on success)
* @param cont_cls closure for cont
* @return GNUNET_OK on success
*/
int
GNUNET_FS_handle_on_demand_block (const struct GNUNET_HashCode * key, uint32_t size,
const void *data, enum GNUNET_BLOCK_Type type,
uint32_t priority, uint32_t anonymity,
struct GNUNET_TIME_Absolute expiration,
uint64_t uid,
GNUNET_DATASTORE_DatumProcessor cont,
void *cont_cls)
{
const struct OnDemandBlock *odb;
struct GNUNET_HashCode nkey;
struct GNUNET_CRYPTO_SymmetricSessionKey skey;
struct GNUNET_CRYPTO_SymmetricInitializationVector iv;
struct GNUNET_HashCode query;
ssize_t nsize;
char ndata[DBLOCK_SIZE];
char edata[DBLOCK_SIZE];
const char *fn;
struct GNUNET_DISK_FileHandle *fh;
uint64_t off;
struct IndexInfo *ii;
if (size != sizeof (struct OnDemandBlock))
{
GNUNET_break (0);
GNUNET_DATASTORE_remove (dsh, key, size, data, -1, -1,
GNUNET_TIME_UNIT_FOREVER_REL, &remove_cont, NULL);
return GNUNET_SYSERR;
}
odb = (const struct OnDemandBlock *) data;
off = GNUNET_ntohll (odb->offset);
ii = GNUNET_CONTAINER_multihashmap_get (ifm, &odb->file_id);
if (NULL == ii)
{
GNUNET_break (0);
return GNUNET_SYSERR;
}
fn = ii->filename;
if ((NULL == fn) || (0 != ACCESS (fn, R_OK)))
{
GNUNET_STATISTICS_update (GSF_stats,
gettext_noop
("# index blocks removed: original file inaccessible"),
1, GNUNET_YES);
GNUNET_DATASTORE_remove (dsh, key, size, data, -1, -1,
GNUNET_TIME_UNIT_FOREVER_REL, &remove_cont, NULL);
return GNUNET_SYSERR;
}
if ((NULL ==
(fh =
GNUNET_DISK_file_open (fn, GNUNET_DISK_OPEN_READ,
GNUNET_DISK_PERM_NONE))) ||
(off != GNUNET_DISK_file_seek (fh, off, GNUNET_DISK_SEEK_SET)) ||
(-1 == (nsize = GNUNET_DISK_file_read (fh, ndata, sizeof (ndata)))))
{
GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
_
("Could not access indexed file `%s' (%s) at offset %llu: %s\n"),
GNUNET_h2s (&odb->file_id), fn, (unsigned long long) off,
(fn == NULL) ? _("not indexed") : STRERROR (errno));
if (fh != NULL)
GNUNET_DISK_file_close (fh);
GNUNET_DATASTORE_remove (dsh, key, size, data, -1, -1,
GNUNET_TIME_UNIT_FOREVER_REL, &remove_cont, NULL);
return GNUNET_SYSERR;
}
GNUNET_DISK_file_close (fh);
GNUNET_CRYPTO_hash (ndata, nsize, &nkey);
GNUNET_CRYPTO_hash_to_aes_key (&nkey, &skey, &iv);
GNUNET_CRYPTO_symmetric_encrypt (ndata, nsize, &skey, &iv, edata);
GNUNET_CRYPTO_hash (edata, nsize, &query);
if (0 != memcmp (&query, key, sizeof (struct GNUNET_HashCode)))
{
GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
_("Indexed file `%s' changed at offset %llu\n"), fn,
(unsigned long long) off);
GNUNET_DATASTORE_remove (dsh, key, size, data, -1, -1,
GNUNET_TIME_UNIT_FOREVER_REL, &remove_cont, NULL);
return GNUNET_SYSERR;
}
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"On-demand encoded block for query `%s'\n", GNUNET_h2s (key));
cont (cont_cls, key, nsize, edata, GNUNET_BLOCK_TYPE_FS_DBLOCK, priority,
anonymity, expiration, uid);
return GNUNET_OK;
}
/**
* Sign name and records
*
* @param key the private key
* @param expire block expiration
* @param label the name for the records
* @param rd record data
* @param rd_count number of records
* @return NULL on error (block too large)
*/
struct GNUNET_GNSRECORD_Block *
GNUNET_GNSRECORD_block_create (const struct GNUNET_CRYPTO_EcdsaPrivateKey *key,
struct GNUNET_TIME_Absolute expire,
const char *label,
const struct GNUNET_GNSRECORD_Data *rd,
unsigned int rd_count)
{
size_t payload_len = GNUNET_GNSRECORD_records_get_size (rd_count, rd);
char payload[sizeof (uint32_t) + payload_len];
struct GNUNET_GNSRECORD_Block *block;
struct GNUNET_CRYPTO_EcdsaPublicKey pkey;
struct GNUNET_CRYPTO_EcdsaPrivateKey *dkey;
struct GNUNET_CRYPTO_SymmetricInitializationVector iv;
struct GNUNET_CRYPTO_SymmetricSessionKey skey;
struct GNUNET_GNSRECORD_Data rdc[rd_count];
uint32_t rd_count_nbo;
unsigned int i;
struct GNUNET_TIME_Absolute now;
if (payload_len > GNUNET_GNSRECORD_MAX_BLOCK_SIZE)
return NULL;
/* convert relative to absolute times */
now = GNUNET_TIME_absolute_get ();
for (i=0;i<rd_count;i++)
{
rdc[i] = rd[i];
if (0 != (rd[i].flags & GNUNET_GNSRECORD_RF_RELATIVE_EXPIRATION))
{
struct GNUNET_TIME_Relative t;
/* encrypted blocks must never have relative expiration times, convert! */
rdc[i].flags &= ~GNUNET_GNSRECORD_RF_RELATIVE_EXPIRATION;
t.rel_value_us = rdc[i].expiration_time;
rdc[i].expiration_time = GNUNET_TIME_absolute_add (now, t).abs_value_us;
}
}
/* serialize */
rd_count_nbo = htonl (rd_count);
memcpy (payload, &rd_count_nbo, sizeof (uint32_t));
GNUNET_assert (payload_len ==
GNUNET_GNSRECORD_records_serialize (rd_count, rdc,
payload_len, &payload[sizeof (uint32_t)]));
block = GNUNET_malloc (sizeof (struct GNUNET_GNSRECORD_Block) +
sizeof (uint32_t) + payload_len);
block->purpose.size = htonl (sizeof (uint32_t) + payload_len +
sizeof (struct GNUNET_CRYPTO_EccSignaturePurpose) +
sizeof (struct GNUNET_TIME_AbsoluteNBO));
block->purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_GNS_RECORD_SIGN);
block->expiration_time = GNUNET_TIME_absolute_hton (expire);
/* encrypt and sign */
dkey = GNUNET_CRYPTO_ecdsa_private_key_derive (key,
label,
"gns");
GNUNET_CRYPTO_ecdsa_key_get_public (dkey,
&block->derived_key);
GNUNET_CRYPTO_ecdsa_key_get_public (key,
&pkey);
derive_block_aes_key (&iv, &skey, label, &pkey);
GNUNET_break (payload_len + sizeof (uint32_t) ==
GNUNET_CRYPTO_symmetric_encrypt (payload, payload_len + sizeof (uint32_t),
&skey, &iv,
&block[1]));
if (GNUNET_OK !=
GNUNET_CRYPTO_ecdsa_sign (dkey,
&block->purpose,
&block->signature))
{
GNUNET_break (0);
GNUNET_free (dkey);
GNUNET_free (block);
return NULL;
}
GNUNET_free (dkey);
return block;
}
static int
verifyCrypto ()
{
struct GNUNET_CRYPTO_SymmetricSessionKey key;
char result[GNUNET_CRYPTO_AES_KEY_LENGTH];
char *res;
int ret;
unsigned char plain[] =
{
29, 128, 192, 253, 74, 171, 38, 187, 84, 219, 76, 76, 209, 118, 33, 249,
172, 124, 96, 9, 157, 110, 8, 215, 200, 63, 69, 230, 157, 104, 247, 164
};
unsigned char raw_key_aes[] =
{
106, 74, 209, 88, 145, 55, 189, 135, 125, 180, 225, 108, 183, 54, 25,
169, 129, 188, 131, 75, 227, 245, 105, 10, 225, 15, 115, 159, 148, 184,
34, 191
};
unsigned char raw_key_twofish[] =
{
145, 55, 189, 135, 125, 180, 225, 108, 183, 54, 25,
169, 129, 188, 131, 75, 227, 245, 105, 10, 225, 15, 115, 159, 148, 184,
34, 191, 106, 74, 209, 88
};
unsigned char encrresult[] =
{
155, 88, 106, 174, 124, 172, 47, 149, 85, 15, 208, 176, 65, 124, 155,
74, 215, 25, 177, 231, 162, 109, 165, 4, 133, 165, 93, 44, 213, 77,
206, 204, 1
};
res = NULL;
ret = 0;
memcpy (key.aes_key, raw_key_aes, GNUNET_CRYPTO_AES_KEY_LENGTH);
memcpy (key.twofish_key, raw_key_twofish, GNUNET_CRYPTO_AES_KEY_LENGTH);
if (GNUNET_CRYPTO_AES_KEY_LENGTH !=
GNUNET_CRYPTO_symmetric_encrypt (plain, GNUNET_CRYPTO_AES_KEY_LENGTH, &key,
(const struct
GNUNET_CRYPTO_SymmetricInitializationVector *)
"testtesttesttesttesttesttesttest",
result))
{
printf ("Wrong return value from encrypt block.\n");
ret = 1;
goto error;
}
if (0 != memcmp (encrresult, result, GNUNET_CRYPTO_AES_KEY_LENGTH))
{
int i;
printf ("Encrypted result wrong.\n");
for (i=0; i<GNUNET_CRYPTO_AES_KEY_LENGTH; i++)
printf ("%u, ", (uint8_t) result[i]);
ret = 1;
goto error;
}
res = GNUNET_malloc (GNUNET_CRYPTO_AES_KEY_LENGTH);
if (GNUNET_CRYPTO_AES_KEY_LENGTH !=
GNUNET_CRYPTO_symmetric_decrypt (result, GNUNET_CRYPTO_AES_KEY_LENGTH, &key,
(const struct
GNUNET_CRYPTO_SymmetricInitializationVector *)
"testtesttesttesttesttesttesttest", res))
{
printf ("Wrong return value from decrypt block.\n");
ret = 1;
goto error;
}
if (0 != memcmp (res, plain, GNUNET_CRYPTO_AES_KEY_LENGTH))
{
printf ("Decrypted result does not match input.\n");
ret = 1;
}
error:
GNUNET_free_non_null (res);
return ret;
}
