Work with PkDecryption keys by their private keys

Change interface to allow the app to get the private part of the
key and instantiate a decryption object from just the private part
of the key.

Changes the function generating a key from random bytes to be
initialising a key with a private key (because it's exactly the
same thing). Exports & imports private key parts as ArrayBuffer at
JS level rather than base64 assuming we are moving that way in
general.

1 files changed, 7 insertions, 2 deletions

diff --git a/tests/test_pk.cpp b/tests/test_pk.cpp
index ee12603..42cc8c9 100644
--- a/tests/test_pk.cpp
+++ b/tests/test_pk.cpp
@@ -36,7 +36,7 @@ const std::uint8_t *bob_public = (std::uint8_t *) "3p7bfXt9wbTTW2HC7OQ1Nz+DQ8hbe
 
 std::uint8_t pubkey[::olm_pk_key_length()];
 
-olm_pk_generate_key(
+olm_pk_key_from_private(
     decryption,
     pubkey, sizeof(pubkey),
     alice_private, sizeof(alice_private)
@@ -44,6 +44,11 @@ olm_pk_generate_key(
 
 assert_equals(alice_public, pubkey, olm_pk_key_length());
 
+uint8_t *alice_private_back_out = (uint8_t *)malloc(olm_pk_private_key_length());
+olm_pk_get_private_key(decryption, alice_private_back_out, olm_pk_private_key_length());
+assert_equals(alice_private, alice_private_back_out, olm_pk_private_key_length());
+free(alice_private_back_out);
+
 std::uint8_t encryption_buffer[olm_pk_encryption_size()];
 OlmPkEncryption *encryption = olm_pk_encryption(encryption_buffer);
 
@@ -105,7 +110,7 @@ const std::uint8_t *alice_public = (std::uint8_t *) "hSDwCYkwp1R0i33ctD73Wg2/Og0
 
 std::uint8_t pubkey[olm_pk_key_length()];
 
-olm_pk_generate_key(
+olm_pk_key_from_private(
     decryption,
     pubkey, sizeof(pubkey),
     alice_private, sizeof(alice_private)