// ===========================================================================
//	UAMEncrypt.c 			© 1998-2001 Microsoft Corp. All rights reserved.
// ===========================================================================
// 	Ecryption functions for use by Microsoft User Authentication Method.
//
// ===========================================================================

#ifdef UAM_TARGET_CARBON
#include <CoreFoundation/CoreFoundation.h>
#endif

#include <string.h>
#include <ctype.h>

#include "UAMEncrypt.h"
#include "UAMDebug.h"


// ---------------------------------------------------------------------------
//		¥ UAM_GetEncryptedLmOwfPassword()
// ---------------------------------------------------------------------------
//	Using a combination of the above to functions, build an encrypted owf
//	password that we can send back to the server.
//
//	Returns: TRUE if the encryption attempt succeeded.
//

Boolean
UAM_GetEncryptedLmOwfPassword(
	char*		inClearTextPassword,
	char*		inServerChallenge,
	char*		outEncryptedOwfPassword
)
{
	LM_OWF_PASSWORD	theLmOwfPassword;
	
	memset(&theLmOwfPassword, '\0', sizeof(theLmOwfPassword));
	
	if (!MacSspCalculateLmOwfPassword(
				(PLM_PASSWORD)inClearTextPassword, 
				(PLM_OWF_PASSWORD)&theLmOwfPassword))
	{
		return(false);
	}
	
	if (!MacSspCalculateLmResponse(
				(PLM_CHALLENGE)inServerChallenge,
				(PLM_OWF_PASSWORD)&theLmOwfPassword,
				(PLM_RESPONSE)outEncryptedOwfPassword))
	{
		return(false);
	}
	
	return(true);
}


// ---------------------------------------------------------------------------
//		¥ UAM_GetDoubleEncryptedLmOwfPasswords()
// ---------------------------------------------------------------------------
//	Taken from the NT RtlXXX sources, this algorithm is designed to deal with the encryption
//	of two passwords, when the OneWayFunction of one is known on the target.  Specifically,
//	
//		for passwords x, y 
//	-- do a one way encryption of x  to Owf(x) -> result(0..15)
//	-- do a one way encryption of  y to Owf(x) -> result(16..31)
//

Boolean
UAM_GetDoubleEncryptedLmOwfPasswords(
	char*		inClearTextPassword,
	char*		inKey,
	char*		outEncryptedOwfPasswords
)
{
	if (!MacSspCalculateLmOwfPassword(
			(char*)inClearTextPassword,
			(PLM_OWF_PASSWORD)outEncryptedOwfPasswords))
	{
		return(false);
	}
		
	if (!MacSspCalculateLmOwfPassword(
			(char*)inKey,
			(PLM_OWF_PASSWORD)(outEncryptedOwfPasswords + kOneWayEncryptedArgSize)))
	{
		return(false);
	}
			
	return(true);
}