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+/*
+ * Copyright (c) 2000-2001,2011,2014 Apple Inc. All Rights Reserved.
+ * 
+ * The contents of this file constitute Original Code as defined in and are
+ * subject to the Apple Public Source License Version 1.2 (the 'License').
+ * You may not use this file except in compliance with the License. Please obtain
+ * a copy of the License at http://www.apple.com/publicsource and read it before
+ * using this file.
+ * 
+ * This Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS
+ * OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, INCLUDING WITHOUT
+ * LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
+ * PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. Please see the License for the
+ * specific language governing rights and limitations under the License.
+ */
+
+
+/*
+ 	File:		pbkdf2.h
+ 	Contains:	Apple Data Security Services PKCS #5 PBKDF2 function declaration.
+ 	Copyright (c) 1999,2011,2014 Apple Inc. All Rights Reserved.
+*/
+
+#ifndef __PBKDF2__
+#define __PBKDF2__
+
+#include <Security/cssmconfig.h>
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+/* This function should generate a pseudo random octect stream
+   of hLen bytes long (The value hLen is specified as an argument to pbkdf2
+   and should be constant for any given prf function.) which is output in the buffer
+   pointed to by randomPtr (the caller of this function is responsible for allocation
+   of the buffer).
+   The inputs to the pseudo random function are the first keyLen octets pointed
+   to by keyPtr and the first textLen octets pointed to by textPtr.
+   Both keyLen and textLen can have any nonzero value.
+   A good prf would be a HMAC-SHA-1 algorithm where the keyPtr octets serve as
+   HMAC's "key" and the textPtr octets serve as HMAC's "text".  */
+typedef void (*PRF)(const void *keyPtr, uint32 keyLen,
+					const void *textPtr, uint32 textLen,
+					void *randomPtr);
+
+/* This function implements the PBKDF2 key derrivation algorithm described in
+   http://www.rsa.com/rsalabs/pubs/PKCS/html/pkcs-5.html
+   The output is a derived key of dkLen bytes which is written to the buffer
+   pointed to by dkPtr.
+   The caller should ensure dkPtr is at least dkLen bytes long.
+   The Key is derived from passwordPtr (which is passwordLen bytes long) and from
+   saltPtr (which is saltLen bytes long).  The algorithm used is desacribed in
+   PKCS #5 version 2.0 and iterationCount iterations are performed.
+   The argument prf is a pointer to a psuedo random number generator declared above.
+   It should write exactly hLen bytes into its output buffer each time it is called.
+   The argument tempBuffer should point to a buffer MAX (hLen, saltLen + 4) + 2 * hLen
+   bytes long.  This buffer is used during the calculation for intermediate results.
+   Security Considerations:
+   The argument saltPtr should be a pointer to a buffer of at least 8 random bytes
+   (64 bits).  Thus saltLen should be >= 8.
+   For each session a new salt should be generated.
+   The value of iterationCount should be at least 1000 (one thousand).
+   A good prf would be a HMAC-SHA-1 algorithm where the password serves as
+   HMAC's "key" and the data serves as HMAC's "text".  */
+void pbkdf2 (PRF prf, uint32 hLen,
+			 const void *passwordPtr, uint32 passwordLen,
+			 const void *saltPtr, uint32 saltLen,
+			 uint32 iterationCount,
+			 void *dkPtr, uint32 dkLen,
+			 void *tempBuffer);
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif /* __PBKDF2__ */