From d45f383b0150c2617c1e0b9169205eb2069e2711 Mon Sep 17 00:00:00 2001
From: Hanno Becker <hanno.becker@arm.com>
Date: Tue, 20 Aug 2019 14:21:40 +0100
Subject: [PATCH] TinyCrypt PK parse: Impl. EC public key derivation in
 TC-based ECDSA

---
 library/pkparse.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/library/pkparse.c b/library/pkparse.c
index dbef18a3e..fce5ad70a 100644
--- a/library/pkparse.c
+++ b/library/pkparse.c
@@ -978,7 +978,14 @@ static int pk_parse_key_sec1_der( mbedtls_uecc_keypair *keypair,
         }
     }
 
-    //TODO: Do we need to support derived public keys with uecc?
+    if( !pubkey_done )
+    {
+        ret = uECC_compute_public_key( keypair->private_key,
+                                       keypair->public_key,
+                                       uECC_secp256r1() );
+        if( ret == 0 )
+            return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT );
+    }
 
     return( 0 );
 }