Encode the account keys as a signed JSON object

3 files changed, 101 insertions, 10 deletions

diff --git a/include/olm/account.hh b/include/olm/account.hh
index d3bde0d..1a4778b 100644
--- a/include/olm/account.hh
+++ b/include/olm/account.hh
@@ -24,7 +24,12 @@
 namespace olm {
 
 
-struct LocalKey {
+struct IdentityKeys {
+    Ed25519KeyPair ed25519_key;
+    Curve25519KeyPair curve25519_key;
+};
+
+struct OneTimeKey {
     std::uint32_t id;
     Curve25519KeyPair key;
 };
@@ -34,8 +39,8 @@ static std::size_t const MAX_ONE_TIME_KEYS = 100;
 
 
 struct Account {
-    LocalKey identity_key;
-    List<LocalKey, MAX_ONE_TIME_KEYS> one_time_keys;
+    IdentityKeys identity_keys;
+    List<OneTimeKey, MAX_ONE_TIME_KEYS> one_time_keys;
     ErrorCode last_error;
 
     /** Number of random bytes needed to create a new account */
@@ -47,7 +52,54 @@ struct Account {
         uint8_t const * random, std::size_t random_length
     );
 
-    LocalKey const * lookup_key(
+    /** Number of bytes needed to output the identity keys for this account */
+    std::size_t get_identity_json_length(
+        std::size_t user_id_length,
+        std::size_t device_id_length,
+        std::uint64_t valid_after_ts,
+        std::uint64_t valid_until_ts
+    );
+
+    /** Output the identity keys for this account as JSON in the following
+     * format.
+     *
+     *  14 "{\"algorithms\":"
+     *  30 "[\"m.olm.curve25519-aes-sha256\""
+     *  15 "],\"device_id\":\""
+     *   ? <device identifier>
+     *  22 "\",\"keys\":{\"curve25519:"
+     *   4 <base64 characters>
+     *   3 "\":\""
+     *  43 <base64 characters>
+     *  11 "\",\"ed25519:"
+     *   4 <base64 characters>
+     *   3 "\":\""
+     *  43 <base64 characters>
+     *  14 "\"},\"user_id\":\""
+     *   ? <user identifier>
+     *  19 "\",\"valid_after_ts\":"
+     *   ? <digits>
+     *  18 ",\"valid_until_ts\":"
+     *   ? <digits>
+     *  16 ",\"signatures\":{\""
+     *   ? <user identifier>
+     *   1 "/"
+     *   ? <device identifier>
+     *  12 "\":{\"ed25519:"
+     *   4 <base64 characters>
+     *   3 "\":\""
+     *  86 <base64 characters>
+     *   4 "\"}}}"
+     */
+    std::size_t get_identity_json(
+        std::uint8_t const * user_id, std::size_t user_id_length,
+        std::uint8_t const * device_id, std::size_t device_id_length,
+        std::uint64_t valid_after_ts,
+        std::uint64_t valid_until_ts,
+        std::uint8_t * identity_keys, std::size_t identity_keys_length
+    );
+
+    OneTimeKey const * lookup_key(
         std::uint32_t id
     );
 
diff --git a/include/olm/olm.hh b/include/olm/olm.hh
index fca35c4..ab71689 100644
--- a/include/olm/olm.hh
+++ b/include/olm/olm.hh
@@ -16,6 +16,7 @@
 #define OLM_HH_
 
 #include <stddef.h>
+#include <stdint.h>
 
 #ifdef __cplusplus
 extern "C" {
@@ -131,18 +132,23 @@ size_t olm_create_account(
 
 /** The size of the output buffer needed to hold the identity keys */
 size_t olm_account_identity_keys_length(
-    OlmAccount * account
+    OlmAccount * account,
+    size_t user_id_length,
+    size_t device_id_length,
+    uint64_t valid_after_ts,
+    uint64_t valid_until_ts
 );
 
 /** Writes the public parts of the identity keys for the account into the
- * identity_keys output buffer. The output is formatted as though it was
- * created with sprintf(output, "[[%10d,\"%43s\"]\n]", key_id, key_base64).
- * The output can either be parsed as fixed width using the above format or by
- * a JSON parser. Returns olm_error() on failure. If the identity_keys
- * buffer was too small then olm_account_last_error() will be
+ * identity_keys output buffer. Returns olm_error() on failure. If the
+ * identity_keys buffer was too small then olm_account_last_error() will be
  * "OUTPUT_BUFFER_TOO_SMALL". */
 size_t olm_account_identity_keys(
     OlmAccount * account,
+    void const * user_id, size_t user_id_length,
+    void const * device_id, size_t device_id_length,
+    uint64_t valid_after_ts,
+    uint64_t valid_until_ts,
     void * identity_keys, size_t identity_key_length
 );
 
diff --git a/include/olm/pickle.hh b/include/olm/pickle.hh
index 1676e23..7a2bd1b 100644
--- a/include/olm/pickle.hh
+++ b/include/olm/pickle.hh
@@ -170,6 +170,39 @@ std::uint8_t const * unpickle(
 );
 
 
+std::size_t pickle_length(
+    const Ed25519PublicKey & value
+);
+
+
+std::uint8_t * pickle(
+    std::uint8_t * pos,
+    const Ed25519PublicKey & value
+);
+
+
+std::uint8_t const * unpickle(
+    std::uint8_t const * pos, std::uint8_t const * end,
+    Ed25519PublicKey & value
+);
+
+
+std::size_t pickle_length(
+    const Ed25519KeyPair & value
+);
+
+
+std::uint8_t * pickle(
+    std::uint8_t * pos,
+    const Ed25519KeyPair & value
+);
+
+
+std::uint8_t const * unpickle(
+    std::uint8_t const * pos, std::uint8_t const * end,
+    Ed25519KeyPair & value
+);
+
 } // namespace olm