/* gost.h */
#ifndef GOST_H
#define GOST_H

#include <stdlib.h>

#include "arch.h"
#include "stdint.h"

#ifdef __cplusplus
extern "C" {
#endif

/* if x86 compatible cpu */
	// NOTE, we should get this from johnswap.h, but I have not done so 'yet'
	// A lot (all??) of the swapping code should also come from johnswap.h
#if !defined (CPU_X64) && !defined (CPU_IA32)
#if defined(i386) || defined(__i386__) || defined(__i486__) || \
	defined(__i586__) || defined(__i686__) || defined(__pentium__) || \
	defined(__pentiumpro__) || defined(__pentium4__) || \
	defined(__nocona__) || defined(prescott) || defined(__core2__) || \
	defined(__k6__) || defined(__k8__) || defined(__athlon__) || \
	defined(__amd64) || defined(__amd64__) || \
	defined(__x86_64) || defined(__x86_64__) || defined(_M_IX86) || \
	defined(_M_AMD64) || defined(_M_IA64) || defined(_M_X64)
/* detect if x86-64 instruction set is supported */
# if defined(_LP64) || defined(__LP64__) || defined(__x86_64) || \
	defined(__x86_64__) || defined(_M_AMD64) || defined(_M_X64)
#  define CPU_X64
# else
#  define CPU_IA32
# endif
#endif
#endif

#if defined(__GNUC__) && defined(CPU_IA32) && !defined(RHASH_NO_ASM)
# define USE_GCC_ASM_IA32
#elif defined(__GNUC__) && defined(CPU_X64) && !defined(RHASH_NO_ASM)
# define USE_GCC_ASM_X64
#endif

#define IS_ALIGNED_32(p) (0 == (3 & ((const char*)(p) - (const char*)0)))
#define IS_ALIGNED_64(p) (0 == (7 & ((const char*)(p) - (const char*)0)))

#if defined(_MSC_VER) || defined(__BORLANDC__)
#define I64(x) x##ui64
#else
#define I64(x) x##LL
#endif

/* convert a hash flag to index */
#if __GNUC__ >= 4 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 4) /* GCC < 3.4 */
# define rhash_ctz(x) __builtin_ctz(x)
#else
unsigned rhash_ctz(unsigned); /* define as function */
#endif

void rhash_u32_swap_copy(void* to, int index, const void* from, size_t length);
void rhash_u64_swap_copy(void* to, int index, const void* from, size_t length);
void rhash_u32_memswap(unsigned *p, int length_in_u32);

/* define bswap_32 */
#if defined(__GNUC__) && defined(CPU_IA32) && !defined(__i386__)
/* for intel x86 CPU */
static inline uint32_t bswap_32(uint32_t x) {
	__asm("bswap\t%0" : "=r" (x) : "0" (x));
	return x;
}
#elif defined(__GNUC__)  && (__GNUC__ >= 4) && (__GNUC__ > 4 || __GNUC_MINOR__ >= 3)
/* for GCC >= 4.3 */
# define bswap_32(x) __builtin_bswap32(x)
#elif (_MSC_VER > 1300) && (defined(CPU_IA32) || defined(CPU_X64)) /* MS VC */
# define bswap_32(x) _byteswap_ulong((unsigned long)x)
#elif !defined(__STRICT_ANSI__)
/* general bswap_32 definition.  Note, bswap_32 already defined as inline in GCC 3.4.4, but it sux. */
static inline uint32_t _JtR_Swap_32(uint32_t x) {
	x = ((x << 8) & 0xFF00FF00) | ((x >> 8) & 0x00FF00FF);
	return (x >> 16) | (x << 16);
}
# define bswap_32(x) _JtR_Swap_32(x)
#else
#define bswap_32(x) ((((x) & 0xff000000) >> 24) | (((x) & 0x00ff0000) >>  8) | \
	(((x) & 0x0000ff00) <<  8) | (((x) & 0x000000ff) << 24))
#endif /* bswap_32 */

#if defined(__GNUC__) && (__GNUC__ >= 4) && (__GNUC__ > 4 || __GNUC_MINOR__ >= 3)
# define bswap_64(x) __builtin_bswap64(x)
#elif (_MSC_VER > 1300) && (defined(CPU_IA32) || defined(CPU_X64)) /* MS VC */
# define bswap_64(x) _byteswap_uint64((__int64)x)
#elif !defined(__STRICT_ANSI__)
/* general bswap_64 definition.  Note, bswap_64 already defined as inline in GCC 3.4.4, but it sux. */
static inline uint64_t _JtR_Swap_64(uint64_t x) {
	union {
		uint64_t ll;
		uint32_t l[2];
	} w, r;
	w.ll = x;
	r.l[0] = bswap_32(w.l[1]);
	r.l[1] = bswap_32(w.l[0]);
	return r.ll;
}
# define bswap_64(x) _JtR_Swap_64(x)
#else
#error "bswap_64 unsupported"
#endif

#if !ARCH_LITTLE_ENDIAN
# define be2me_32(x) (x)
# define be2me_64(x) (x)
# define le2me_32(x) bswap_32(x)
# define le2me_64(x) bswap_64(x)

# define be32_copy(to, index, from, length) memcpy((to) + (index), (from), (length))
# define le32_copy(to, index, from, length) rhash_u32_swap_copy((to), (index), (from), (length))
# define be64_copy(to, index, from, length) memcpy((to) + (index), (from), (length))
# define le64_copy(to, index, from, length) rhash_u64_swap_copy((to), (index), (from), (length))
#else /* !ARCH_LITTLE_ENDIAN */
# define be2me_32(x) bswap_32(x)
# define be2me_64(x) bswap_64(x)
# define le2me_32(x) (x)
# define le2me_64(x) (x)

# define be32_copy(to, index, from, length) rhash_u32_swap_copy((to), (index), (from), (length))
# define le32_copy(to, index, from, length) memcpy((to) + (index), (from), (length))
# define be64_copy(to, index, from, length) rhash_u64_swap_copy((to), (index), (from), (length))
# define le64_copy(to, index, from, length) memcpy((to) + (index), (from), (length))
#endif /* !ARCH_LITTLE_ENDIAN */

/* ROTL/ROTR macros rotate a 32/64-bit word left/right by n bits */
#define ROTL32(dword, n) ((dword) << (n) ^ ((dword) >> (32 - (n))))
#define ROTR32(dword, n) ((dword) >> (n) ^ ((dword) << (32 - (n))))
#define ROTL64(qword, n) ((qword) << (n) ^ ((qword) >> (64 - (n))))
#define ROTR64(qword, n) ((qword) >> (n) ^ ((qword) << (64 - (n))))

#define gost_block_size 32
#define gost_hash_length 32

/* algorithm context */
typedef struct gost_ctx {
	unsigned hash[8];  /* algorithm 256-bit state */
	unsigned sum[8];   /* sum of processed message blocks */
	unsigned char message[gost_block_size]; /* 256-bit buffer for leftovers */
	uint64_t length;   /* number of processed bytes */
	unsigned cryptpro; /* boolean flag, the type of sbox to use */
} gost_ctx;

typedef struct gost_hmac_ctx {
	unsigned char ipad[32];
	unsigned char opad[32];
	gost_ctx ctx;
} gost_hmac_ctx;

/* hash functions */

void john_gost_init(gost_ctx *ctx);
void john_gost_cryptopro_init(gost_ctx *ctx);
void john_gost_update(gost_ctx *ctx, const unsigned char* msg, size_t size);
void john_gost_final(gost_ctx *ctx, unsigned char result[32]);

void john_gost_hmac_starts( gost_hmac_ctx *ctx, const unsigned char *key, size_t keylen );
void john_gost_hmac_update( gost_hmac_ctx *ctx, const unsigned char *input, size_t ilen );
void john_gost_hmac_finish( gost_hmac_ctx *ctx, unsigned char *output );
void john_gost_hmac( const unsigned char *key, size_t keylen, const unsigned char *input, size_t ilen, unsigned char *output );

void gost_init_table(void); /* initialize algorithm static data */

#ifdef __cplusplus
} /* extern "C" */
#endif /* __cplusplus */

#endif /* GOST_H */
