--- /dev/null
+/*
+ * Copyright (c) 2011 Rustam Kovhaev. All rights reserved.
+ * Copyright (c) 2021 Eivind Næss. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ *
+ * 3. The name(s) of the authors of this software must not be used to
+ * endorse or promote products derived from this software without
+ * prior written permission.
+ *
+ * THE AUTHORS OF THIS SOFTWARE DISCLAIM ALL WARRANTIES WITH REGARD TO
+ * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+ * AND FITNESS, IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
+ * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
+ * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
+ * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#ifndef PPP_PEAP_H
+#define PPP_PEAP_H
+
+#define PEAP_PHASE_1 1
+#define PEAP_PHASE_2 2
+
+#define PEAP_HEADERLEN 6
+#define PEAP_FRAGMENT_LENGTH_FIELD 4
+#define PEAP_FLAGS_FIELD 1
+#define PEAP_FLAGS_ACK 0
+
+#define PEAP_CAPABILITIES_TYPE 254
+#define PEAP_CAPABILITIES_LEN 12
+
+#define PEAP_TLV_TYPE 12
+#define PEAP_TLV_LENGTH_FIELD 56
+#define PEAP_TLV_SUBTYPE_REQUEST 0
+#define PEAP_TLV_SUBTYPE_RESPONSE 1
+#define PEAP_TLV_HEADERLEN 8
+#define PEAP_TLV_RESULT_LEN 7
+#define PEAP_TLV_LEN 71
+
+/*
+ * Microsoft PEAP client/server never exchange
+ * outer TLVs during PEAP authentication
+ */
+#define PEAP_TLV_DATA_LEN 61
+
+#define PEAP_TLV_TK_LEN 60
+#define PEAP_TLV_ISK_LEN 32
+#define PEAP_TLV_IPMKSEED_LEN 59
+#define PEAP_TLV_TEMPKEY_LEN 40
+#define PEAP_TLV_IPMK_LEN 40
+#define PEAP_TLV_CMK_LEN 20
+#define PEAP_TLV_NONCE_LEN 32
+#define PEAP_TLV_COMP_MAC_LEN 20
+#define PEAP_TLV_CSK_LEN 128
+#define PEAP_TLV_TK_SEED_LABEL "client EAP encryption"
+#define PEAP_TLV_IPMK_SEED_LABEL "Inner Methods Compound Keys"
+#define PEAP_TLV_CSK_SEED_LABEL "Session Key Generating Function"
+
+#define PEAP_S_FLAG_SET 0x20
+#define PEAP_L_FLAG_SET 0x80
+#define PEAP_LM_FLAG_SET 0xC0
+#define PEAP_M_FLAG_SET 0x40
+#define PEAP_NO_FLAGS 0x00
+
+#define EAP_TLS_KEY_LEN 0x40
+#define TLS_RECORD_MAX_SIZE 0x4000
+
+struct peap_state;
+
+/**
+ * Initialize the PEAP structure
+ */
+int peap_init(struct peap_state** psm, const char *remote_name);
+
+/**
+ * Process a PEAP packet
+ */
+int peap_process(eap_state *esp, u_char id, u_char *inp, int len);
+
+/**
+ * Clean up the PEAP structure
+ */
+void peap_finish(struct peap_state **psm);
+
+#endif /* PPP_PEAP_H */