Add c bindings for the methods for managing one time keys

include/olm/account.hh

@@ -123,8 +123,8 @@ struct Account {
     /** The largest number of one time keys this account can store. */
     std::size_t max_number_of_one_time_keys();
 
-    /** Returns the number of random bytes needed to generate a given number
-     * of new one time keys. */
+    /** The number of random bytes needed to generate a given number of new one
+     * time keys. */
     std::size_t generate_one_time_keys_random_length(
         std::size_t number_of_keys
     );

include/olm/olm.hh

@@ -157,12 +157,8 @@ size_t olm_account_one_time_keys_length(
     OlmAccount * account
 );
 
-/** Writes the public parts of the one time keys for the account into the
- * one_time_keys output buffer. The first key will be formatted as though it was
- * created with sprintf(output, "[[%10d,\"%43s\"]\n", key_id, key_base64).
- * subsequent keys are formatted with ",[%10d,\"%43s\"]\n". The final byte of
- * output will be "]". The output can either be parsed as fixed width using
- * the above format or by a JSON parser. Returns olm_error() on failure.
+/** Writes the public parts of the unpublished one time keys for the account
+ * into the one_time_keys output buffer. Returns olm_error() on failure.
  * If the one_time_keys buffer was too small then olm_account_last_error()
  * will be "OUTPUT_BUFFER_TOO_SMALL". */
 size_t olm_account_one_time_keys(
@@ -170,8 +166,32 @@ size_t olm_account_one_time_keys(
     void * one_time_keys, size_t one_time_keys_length
 );
 
-/* TODO: Add methods for marking keys as used, generating new keys, and
- * tracking which keys have been uploaded to the central servers */
+/** Marks the current set of one time keys as being published. */
+size_t olm_account_mark_keys_as_published(
+    OlmAccount * account
+);
+
+/** The largest number of one time keys this account can store. */
+size_t olm_account_max_number_of_one_time_keys(
+    OlmAccount * account
+);
+
+/** The number of random bytes needed to generate a given number of new one
+ * time keys. */
+size_t olm_account_generate_one_time_keys_random_length(
+    OlmAccount * account,
+    size_t number_of_keys
+);
+
+/** Generates a number of new one time keys. If the total number of keys stored
+ * by this account exceeds max_number_of_one_time_keys() then the old keys are
+ * discarded. Returns olm_error() on error. If the number of random bytes is
+ * too small then olm_account_last_error() will be "NOT_ENOUGH_RANDOM". */
+size_t olm_account_generate_one_time_keys(
+    OlmAccount * account,
+    size_t number_of_keys,
+    void const * random, size_t random_length
+);
 
 /** The number of random bytes needed to create an outbound session */
 size_t olm_create_outbound_session_random_length(

javascript/demo.html

@@ -28,6 +28,9 @@ document.addEventListener("DOMContentLoaded", function (event) {
 
     tasks.push(["alice", "Creating account", function() { alice.create() }]);
     tasks.push(["bob", "Creating account", function() { bob.create() }]);
+    tasks.push(["bob", "Generate one time keys", function() {
+        bob.generate_one_time_keys(1);
+    }]);
     tasks.push(["alice", "Create outbound session", function() {
         var bobs_id_keys = JSON.parse(bob.identity_keys("bob", "bob_device", 0, 0));
         var bobs_id_key;

javascript/olm_post.js

@@ -100,6 +100,28 @@ Account.prototype['one_time_keys'] = restore_stack(function() {
     return Pointer_stringify(keys, keys_length);
 });
 
+Account.prototype['mark_keys_as_published'] = restore_stack(function() {
+    account_method(Module['_olm_account_mark_keys_as_published'])(this.ptr);
+});
+
+Account.prototype['max_number_of_one_time_keys'] = restore_stack(function() {
+    account_method(Module['_olm_account_max_number_of_one_time_keys'])(
+        this.ptr
+    );
+});
+
+Account.prototype['generate_one_time_keys'] = restore_stack(function(
+    number_of_keys
+) {
+    var random_length = account_method(
+        Module['_olm_account_generate_one_time_keys_random_length']
+    )(this.ptr, number_of_keys);
+    var random = random_stack(random_length);
+    account_method(Module['_olm_account_generate_one_time_keys'])(
+        this.ptr, number_of_keys, random, random_length
+    );
+});
+
 Account.prototype['pickle'] = restore_stack(function(key) {
     var key_array = array_from_string(key);
     var pickle_length = account_method(

olm.py

@@ -59,6 +59,18 @@ account_function(
 )
 account_function(lib.olm_account_one_time_keys_length)
 account_function(lib.olm_account_one_time_keys, c_void_p, c_size_t)
+account_function(lib.olm_account_mark_keys_as_published)
+account_function(lib.olm_account_max_number_of_one_time_keys)
+account_function(
+    lib.olm_account_generate_one_time_keys_random_length,
+    c_size_t
+)
+account_function(
+    lib.olm_account_generate_one_time_keys
+    c_size_t,
+    c_void_p, c_size_t
+)
+
 
 def read_random(n):
     with open("/dev/urandom", "rb") as f:
@@ -113,6 +125,23 @@ class Account(object):
         lib.olm_account_one_time_keys(self.ptr, out_buffer, out_length)
         return json.loads(out_buffer.raw)
 
+    def mark_keys_as_published(self):
+        lib.olm_account_mark_keys_as_published(self.ptr)
+
+
+    def max_number_of_one_time_keys(self):
+        return lib.olm_account_max_number_of_one_time_keys(self.ptr)
+
+    def generate_one_time_keys(self, count):
+        random_length = lib.olm_account_generate_one_time_keys_random_length(
+            self.ptr
+        )
+        random = read_random(random_length)
+        random_buffer = create_string_buffer(random)
+        lib.olm_account_generate_one_time_keys(
+            self.ptr, random_buffer, random_length
+        )
+
     def clear(self):
         pass
 

src/account.cpp

@@ -48,7 +48,7 @@ std::size_t olm::Account::remove_key(
 }
 
 std::size_t olm::Account::new_account_random_length() {
-    return 12 * 32;
+    return 2 * 32;
 }
 
 std::size_t olm::Account::new_account(
@@ -64,8 +64,6 @@ std::size_t olm::Account::new_account(
     olm::curve25519_generate_key(random, identity_keys.curve25519_key);
     random += 32;
 
-    generate_one_time_keys(10, random, random_length - 64);
-
     return 0;
 }
 

src/olm.cpp

@@ -370,12 +370,47 @@ size_t olm_account_one_time_keys(
 }
 
 
+size_t olm_account_mark_keys_as_published(
+    OlmAccount * account
+) {
+    return from_c(account)->mark_keys_as_published();
+}
+
+
+size_t olm_account_max_number_of_one_time_keys(
+    OlmAccount * account
+) {
+    return from_c(account)->max_number_of_one_time_keys();
+}
+
+
+size_t olm_account_generate_one_time_keys_random_length(
+    OlmAccount * account,
+    size_t number_of_keys
+) {
+    return from_c(account)->generate_one_time_keys_random_length(number_of_keys);
+}
+
+
+size_t olm_account_generate_one_time_keys(
+    OlmAccount * account,
+    size_t number_of_keys,
+    void const * random, size_t random_length
+) {
+    return from_c(account)->generate_one_time_keys(
+        number_of_keys,
+        from_c(random), random_length
+    );
+}
+
+
 size_t olm_create_outbound_session_random_length(
     OlmSession * session
 ) {
     return from_c(session)->new_outbound_session_random_length();
 }
 
+
 size_t olm_create_outbound_session(
     OlmSession * session,
     OlmAccount * account,

tests/test_olm.cpp

@@ -41,6 +41,12 @@ std::uint8_t account_buffer[::olm_account_size()];
 std::uint8_t random[::olm_create_account_random_length(account)];
 mock_random(random, sizeof(random));
 ::olm_create_account(account, random, sizeof(random));
+std::uint8_t ot_random[::olm_account_generate_one_time_keys_random_length(
+    account, 42
+)];
+mock_random(ot_random, sizeof(ot_random));
+::olm_account_generate_one_time_keys(account, 42, ot_random, sizeof(ot_random));
+
 std::size_t pickle_length = ::olm_pickle_account_length(account);
 std::uint8_t pickle1[pickle_length];
 ::olm_pickle_account(account, "secret_key", 10, pickle1, pickle_length);
@@ -74,6 +80,11 @@ std::uint8_t b_account_buffer[::olm_account_size()];
 std::uint8_t b_random[::olm_create_account_random_length(b_account)];
 mock_random_b(b_random, sizeof(b_random));
 ::olm_create_account(b_account, b_random, sizeof(b_random));
+std::uint8_t o_random[::olm_account_generate_one_time_keys_random_length(
+        b_account, 42
+)];
+mock_random_b(o_random, sizeof(o_random));
+::olm_account_generate_one_time_keys(b_account, 42, o_random, sizeof(o_random));
 
 std::uint8_t b_id_keys[::olm_account_identity_keys_length(b_account, 0, 0, 0, 0)];
 std::uint8_t b_ot_keys[::olm_account_one_time_keys_length(b_account)];
@@ -178,6 +189,11 @@ std::uint8_t b_account_buffer[::olm_account_size()];
 std::uint8_t b_random[::olm_create_account_random_length(b_account)];
 mock_random_b(b_random, sizeof(b_random));
 ::olm_create_account(b_account, b_random, sizeof(b_random));
+std::uint8_t o_random[::olm_account_generate_one_time_keys_random_length(
+        b_account, 42
+)];
+mock_random_b(o_random, sizeof(o_random));
+::olm_account_generate_one_time_keys(b_account, 42, o_random, sizeof(o_random));
 
 std::uint8_t b_id_keys[::olm_account_identity_keys_length(b_account, 0, 0, 0, 0)];
 std::uint8_t b_ot_keys[::olm_account_one_time_keys_length(b_account)];