Fail sig verify if public key is small order

solana-labs · Jul 31, 2020 · 79455d2 · 79455d2
1 parent 8c14000
commit 79455d2
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/src/cuda-ecc-ed25519/verify.cu b/src/cuda-ecc-ed25519/verify.cu
@@ -130,6 +130,10 @@ ed25519_verify_device(const unsigned char *signature,
         return 0;
     }
 
+    if (0 != ge_is_small_order(&A)) {
+        return 0;
+    }
+
     sha512_init(&hash);
     sha512_update(&hash, signature, 32);
     sha512_update(&hash, public_key, 32);