WireGuardKit: Add wrappers for PrivateKey, PublicKey, PreSharedKey

Signed-off-by: Andrej Mihajlov <and@mullvad.net>
2020-11-26 17:23:50 +01:00
parent 76c8487a56
commit 4deaf905c1
21 changed files with 176 additions and 220 deletions
@@ -112,3 +112,13 @@ bool key_from_hex(uint8_t key[static WG_KEY_LEN], const char *hex)

 	return 1 & ((ret - 1) >> 8);
 }
+
+bool key_eq(const uint8_t key1[static WG_KEY_LEN], const uint8_t key2[static WG_KEY_LEN])
+{
+	volatile uint8_t acc = 0;
+	for (unsigned int i = 0; i < WG_KEY_LEN; ++i) {
+		acc |= key1[i] ^ key2[i];
+		asm volatile("" : "=r"(acc) : "0"(acc));
+	}
+	return 1 & ((acc - 1) >> 8);
+}