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pbkdf2_nif

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PBKDF2 NIF implementation

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pbkdf2_nif c_src explicit_bzero.h
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c_src/explicit_bzero.h 

/* By Michael Savage

* 100% domain public

* https://github.com/mikejsavage/safebfuns

*/



#include <string.h>



#if __clang__

	/*

	 * http://clang.llvm.org/docs/LanguageExtensions.html#feature-checking-macros

	 * http://lists.cs.uiuc.edu/pipermail/cfe-dev/2014-December/040627.html

	 */

	#if __has_attribute( noinline ) && __has_attribute( optnone )

		#define NOOPT __attribute__ (( optnone ))

		#define NOINLINE __attribute__ (( noinline ))

	#else

		#error "require clang with noinline and optnone attributes"

	#endif

#elif __GNUC__

	/*

	 * http://gcc.gnu.org/onlinedocs/gcc/Function-Specific-Option-Pragmas.html

	 * http://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html

	 */

	#if __GNUC__ > 4 || ( __GNUC__ == 4 && __GNUC_MINOR__ >= 4 )

		#define NOOPT __attribute__ (( optimize( 0 ) ))

		#define NOINLINE __attribute__ (( noinline ))

	#else

		#error "require gcc >= 4.4"

	#endif

#else

	#error "unrecognised compiler"

	explode

#endif



NOOPT NOINLINE void explicit_bzero( void * const buf, const size_t n );



#ifndef __EXPLICIT_BZERO_INTERNAL

#undef NOOPT

#undef NOINLINE

#endif