eapol: Add eapol_process_ptk_2_of_4

src/eapol.c

@@ -126,3 +126,51 @@ bool eapol_process_ptk_1_of_4(const uint8_t *data, size_t len,
 
 	return true;
 }
+
+bool eapol_process_ptk_2_of_4(const uint8_t *data, size_t len,
+				uint8_t out_snonce[])
+{
+	struct eapol_key *ek;
+	uint16_t key_len;
+
+	if (!eapol_verify(data, len))
+		return false;
+
+	ek = (struct eapol_key *) data;
+
+	/* Verify according to 802.11, Section 11.6.6.2 */
+	if (!ek->key_type)
+		return false;
+
+	if (ek->smk_message)
+		return false;
+
+	if (ek->install)
+		return false;
+
+	if (ek->key_ack)
+		return false;
+
+	if (!ek->key_mic)
+		return false;
+
+	if (ek->secure)
+		return false;
+
+	if (ek->error)
+		return false;
+
+	if (ek->request)
+		return false;
+
+	if (ek->encrypted_key_data)
+		return false;
+
+	key_len = L_BE16_TO_CPU(ek->key_length);
+	if (key_len != 0)
+		return false;
+
+	memcpy(out_snonce, ek->key_nonce, sizeof(ek->key_nonce));
+
+	return true;
+}

src/eapol.h

@@ -97,3 +97,5 @@ bool eapol_verify(const uint8_t *data, size_t len);
 
 bool eapol_process_ptk_1_of_4(const uint8_t *data, size_t len,
 				uint8_t out_anonce[]);
+bool eapol_process_ptk_2_of_4(const uint8_t *data, size_t len,
+				uint8_t out_snonce[]);