+#ifndef PPP_CHAPMS_H
+#define PPP_CHAPMS_H
+
+#include "pppdconf.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define MAX_NT_PASSWORD 256 /* Max (Unicode) chars in an NT pass */
+
+#define MS_CHAP_RESPONSE_LEN 49 /* Response length for MS-CHAP */
+#define MS_CHAP2_RESPONSE_LEN 49 /* Response length for MS-CHAPv2 */
+#define MS_AUTH_RESPONSE_LENGTH 40 /* MS-CHAPv2 authenticator response, */
+#define MS_AUTH_NTRESP_LEN 24 /* Length of NT-response field */
+ /* as ASCII */
+
+/* E=eeeeeeeeee error codes for MS-CHAP failure messages. */
+#define MS_CHAP_ERROR_RESTRICTED_LOGON_HOURS 646
+#define MS_CHAP_ERROR_ACCT_DISABLED 647
+#define MS_CHAP_ERROR_PASSWD_EXPIRED 648
+#define MS_CHAP_ERROR_NO_DIALIN_PERMISSION 649
+#define MS_CHAP_ERROR_AUTHENTICATION_FAILURE 691
+#define MS_CHAP_ERROR_CHANGING_PASSWORD 709
+
+/*
+ * Offsets within the response field for MS-CHAP
+ */
+#define MS_CHAP_LANMANRESP 0
+#define MS_CHAP_LANMANRESP_LEN 24
+#define MS_CHAP_NTRESP 24
+#define MS_CHAP_NTRESP_LEN 24
+#define MS_CHAP_USENT 48
+
+/*
+ * Offsets within the response field for MS-CHAP2
+ */
+#define MS_CHAP2_PEER_CHALLENGE 0
+#define MS_CHAP2_PEER_CHAL_LEN 16
+#define MS_CHAP2_RESERVED_LEN 8
+#define MS_CHAP2_NTRESP 24
+#define MS_CHAP2_NTRESP_LEN 24
+#define MS_CHAP2_FLAGS 48
+
+/* Are we the authenticator or authenticatee? For MS-CHAPv2 key derivation. */
+#define MS_CHAP2_AUTHENTICATEE 0
+#define MS_CHAP2_AUTHENTICATOR 1
+
+void ChapMS (u_char *, char *, int, u_char *);
+void ChapMS2 (u_char *, u_char *, char *, char *, int,
+ u_char *, u_char[MS_AUTH_RESPONSE_LENGTH+1], int);
+
+void ChallengeHash (u_char[16], u_char *, char *, u_char[8]);
+
+
+/**
+ * PasswordHashHash - 16 bytes representing the NT Password Hash Hash
+ * NTResponse - 24 bytes represending the NTResponse parameter
+ * PeerChallenge - 16 bytes challange for peer
+ * rchallenge - 16 bytes challenge provided by peer
+ * authResponse - 24 + 1 byte to store the authenticator response
+ */
+void GenerateAuthenticatorResponse(unsigned char *PasswordHashHash,
+ unsigned char *NTResponse, unsigned char *PeerChallenge,
+ unsigned char *rchallenge, char *username,
+ unsigned char *authResponse);