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diff --git a/src/auths/auth-spa.h b/src/auths/auth-spa.h
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+/*************************************************
+* Exim - an Internet mail transport agent *
+*************************************************/
+
+/*
+ * This file provides the necessary methods for authenticating with
+ * Microsoft's Secure Password Authentication.
+
+ * All the code used here was torn by Marc Prud'hommeaux out of the
+ * Samba project (by Andrew Tridgell, Jeremy Allison, and others).
+ */
+
+/* December 2004: The spa_base64_to_bits() function has no length checking in
+it. I have added a check. PH */
+
+/* It seems that some systems have existing but different definitions of some
+of the following types. I received a complaint about "int16" causing
+compilation problems. So I (PH) have renamed them all, to be on the safe side.
+
+typedef signed short int16;
+typedef unsigned short uint16;
+typedef unsigned uint32;
+typedef unsigned char uint8;
+*/
+
+typedef signed short int16x;
+typedef unsigned short uint16x;
+typedef unsigned uint32x;
+typedef unsigned char uint8x;
+
+typedef struct
+{
+ uint16x len;
+ uint16x maxlen;
+ uint32x offset;
+} SPAStrHeader;
+
+typedef struct
+{
+ char ident[8];
+ uint32x msgType;
+ SPAStrHeader uDomain;
+ uint32x flags;
+ uint8x challengeData[8];
+ uint8x reserved[8];
+ SPAStrHeader emptyString;
+ uint8x buffer[1024];
+ uint32x bufIndex;
+} SPAAuthChallenge;
+
+
+typedef struct
+{
+ char ident[8];
+ uint32x msgType;
+ uint32x flags;
+ SPAStrHeader user;
+ SPAStrHeader domain;
+ uint8x buffer[1024];
+ uint32x bufIndex;
+} SPAAuthRequest;
+
+typedef struct
+{
+ char ident[8];
+ uint32x msgType;
+ SPAStrHeader lmResponse;
+ SPAStrHeader ntResponse;
+ SPAStrHeader uDomain;
+ SPAStrHeader uUser;
+ SPAStrHeader uWks;
+ SPAStrHeader sessionKey;
+ uint32x flags;
+ uint8x buffer[1024];
+ uint32x bufIndex;
+} SPAAuthResponse;
+
+#define spa_request_length(ptr) (((ptr)->buffer - (uint8x*)(ptr)) + (ptr)->bufIndex)
+
+void spa_bits_to_base64 (unsigned char *, const unsigned char *, int);
+int spa_base64_to_bits(char *, int, const char *);
+void spa_build_auth_response (SPAAuthChallenge *challenge,
+ SPAAuthResponse *response, char *user, char *password);
+void spa_build_auth_request (SPAAuthRequest *request, char *user,
+ char *domain);
+extern void spa_smb_encrypt (unsigned char * passwd, unsigned char * c8,
+ unsigned char * p24);
+extern void spa_smb_nt_encrypt (unsigned char * passwd, unsigned char * c8,
+ unsigned char * p24);
+extern char *unicodeToString(char *p, size_t len);
+extern void spa_build_auth_challenge(SPAAuthRequest *, SPAAuthChallenge *);
+