Attempt to add resource management, for multiple cores of the same type.

Find a suitable core, and mark it busy. Don't forget to release it as soon
as you're done. This has a knock-on effect of un-const'ing core arguments
and struct fields in a lot of places, and it moves some core checks around.

1 files changed, 9 insertions, 2 deletions

diff --git a/pbkdf2.c b/pbkdf2.c
index f361328..690831f 100644
--- a/pbkdf2.c
+++ b/pbkdf2.c
@@ -46,7 +46,7 @@
  * if and when we get clever about reusing HMAC state for speed.
  */
 
-static hal_error_t do_hmac(const hal_core_t *core,
+static hal_error_t do_hmac(hal_core_t *core,
                            const hal_hash_descriptor_t * const d,
                            const uint8_t * const pw,   const size_t pw_len,
                            const uint8_t * const data, const size_t data_len,
@@ -78,7 +78,7 @@ static hal_error_t do_hmac(const hal_core_t *core,
  * Derive a key from a passphrase using the PBKDF2 algorithm.
  */
 
-hal_error_t hal_pbkdf2(const hal_core_t *core,
+hal_error_t hal_pbkdf2(hal_core_t *core,
                        const hal_hash_descriptor_t * const descriptor,
                        const uint8_t * const password, const size_t password_length,
                        const uint8_t * const salt,     const size_t salt_length,
@@ -108,6 +108,13 @@ hal_error_t hal_pbkdf2(const hal_core_t *core,
   memset(result, 0, sizeof(result));
   memset(mac,    0, sizeof(mac));
 
+#if 1
+  /* HACK - find the second sha256 core, to avoid interfering with rpc.
+   */
+  core = hal_core_find(descriptor->core_name, NULL);
+  core = hal_core_find(descriptor->core_name, core);
+#endif
+
   /*
    * We probably should check here to see whether the password is
    * longer than the HMAC block size, and, if so, we should hash the