zfs/module/icp/algs/skein/skein_impl.h - backupdr - Git at Google

 /*
  * Internal definitions for Skein hashing.
  * Source code author: Doug Whiting, 2008.
  * This algorithm and source code is released to the public domain.
  *
  * The following compile-time switches may be defined to control some
  * tradeoffs between speed, code size, error checking, and security.
  *
  * The "default" note explains what happens when the switch is not defined.
  *
  *  SKEIN_DEBUG            -- make callouts from inside Skein code
  *                            to examine/display intermediate values.
  *                            [default: no callouts (no overhead)]
  *
  *  SKEIN_ERR_CHECK        -- how error checking is handled inside Skein
  *                            code. If not defined, most error checking
  *                            is disabled (for performance). Otherwise,
  *                            the switch value is interpreted as:
  *                                0: use assert()      to flag errors
  *                                1: return SKEIN_FAIL to flag errors
  */
 /* Copyright 2013 Doug Whiting. This code is released to the public domain. */

 #ifndef	_SKEIN_IMPL_H_
 #define	_SKEIN_IMPL_H_

 #include <sys/skein.h>
 #include <sys/strings.h>
 #include <sys/note.h>
 #include "skein_impl.h"
 #include "skein_port.h"

 /*
  * "Internal" Skein definitions
  *    -- not needed for sequential hashing API, but will be
  *           helpful for other uses of Skein (e.g., tree hash mode).
  *    -- included here so that they can be shared between
  *           reference and optimized code.
  */

 /* tweak word T[1]: bit field starting positions */
 /* offset 64 because it's the second word  */
 #define	SKEIN_T1_BIT(BIT)	((BIT) - 64)

 /* bits 112..118: level in hash tree */
 #define	SKEIN_T1_POS_TREE_LVL	SKEIN_T1_BIT(112)
 /* bit  119: partial final input byte */
 #define	SKEIN_T1_POS_BIT_PAD	SKEIN_T1_BIT(119)
 /* bits 120..125: type field */
 #define	SKEIN_T1_POS_BLK_TYPE	SKEIN_T1_BIT(120)
 /* bits 126: first block flag */
 #define	SKEIN_T1_POS_FIRST	SKEIN_T1_BIT(126)
 /* bit  127: final block flag */
 #define	SKEIN_T1_POS_FINAL	SKEIN_T1_BIT(127)

 /* tweak word T[1]: flag bit definition(s) */
 #define	SKEIN_T1_FLAG_FIRST	(((uint64_t)1) << SKEIN_T1_POS_FIRST)
 #define	SKEIN_T1_FLAG_FINAL	(((uint64_t)1) << SKEIN_T1_POS_FINAL)
 #define	SKEIN_T1_FLAG_BIT_PAD	(((uint64_t)1) << SKEIN_T1_POS_BIT_PAD)

 /* tweak word T[1]: tree level bit field mask */
 #define	SKEIN_T1_TREE_LVL_MASK	(((uint64_t)0x7F) << SKEIN_T1_POS_TREE_LVL)
 #define	SKEIN_T1_TREE_LEVEL(n)	(((uint64_t)(n)) << SKEIN_T1_POS_TREE_LVL)

 /* tweak word T[1]: block type field */
 #define	SKEIN_BLK_TYPE_KEY	(0)	/* key, for MAC and KDF */
 #define	SKEIN_BLK_TYPE_CFG	(4)	/* configuration block */
 #define	SKEIN_BLK_TYPE_PERS	(8)	/* personalization string */
 #define	SKEIN_BLK_TYPE_PK	(12)	/* public key (for signature hashing) */
 #define	SKEIN_BLK_TYPE_KDF	(16)	/* key identifier for KDF */
 #define	SKEIN_BLK_TYPE_NONCE	(20)	/* nonce for PRNG */
 #define	SKEIN_BLK_TYPE_MSG	(48)	/* message processing */
 #define	SKEIN_BLK_TYPE_OUT	(63)	/* output stage */
 #define	SKEIN_BLK_TYPE_MASK	(63)	/* bit field mask */

 #define	SKEIN_T1_BLK_TYPE(T)	\
 	(((uint64_t)(SKEIN_BLK_TYPE_##T)) << SKEIN_T1_POS_BLK_TYPE)
 /* key, for MAC and KDF */
 #define	SKEIN_T1_BLK_TYPE_KEY	SKEIN_T1_BLK_TYPE(KEY)
 /* configuration block */
 #define	SKEIN_T1_BLK_TYPE_CFG	SKEIN_T1_BLK_TYPE(CFG)
 /* personalization string */
 #define	SKEIN_T1_BLK_TYPE_PERS	SKEIN_T1_BLK_TYPE(PERS)
 /* public key (for digital signature hashing) */
 #define	SKEIN_T1_BLK_TYPE_PK	SKEIN_T1_BLK_TYPE(PK)
 /* key identifier for KDF */
 #define	SKEIN_T1_BLK_TYPE_KDF	SKEIN_T1_BLK_TYPE(KDF)
 /* nonce for PRNG */
 #define	SKEIN_T1_BLK_TYPE_NONCE	SKEIN_T1_BLK_TYPE(NONCE)
 /* message processing */
 #define	SKEIN_T1_BLK_TYPE_MSG	SKEIN_T1_BLK_TYPE(MSG)
 /* output stage */
 #define	SKEIN_T1_BLK_TYPE_OUT	SKEIN_T1_BLK_TYPE(OUT)
 /* field bit mask */
 #define	SKEIN_T1_BLK_TYPE_MASK	SKEIN_T1_BLK_TYPE(MASK)

 #define	SKEIN_T1_BLK_TYPE_CFG_FINAL	\
 	(SKEIN_T1_BLK_TYPE_CFG | SKEIN_T1_FLAG_FINAL)
 #define	SKEIN_T1_BLK_TYPE_OUT_FINAL	\
 	(SKEIN_T1_BLK_TYPE_OUT | SKEIN_T1_FLAG_FINAL)

 #define	SKEIN_VERSION		(1)

 #ifndef	SKEIN_ID_STRING_LE	/* allow compile-time personalization */
 #define	SKEIN_ID_STRING_LE	(0x33414853)	/* "SHA3" (little-endian) */
 #endif

 #define	SKEIN_MK_64(hi32, lo32)	((lo32) + (((uint64_t)(hi32)) << 32))
 #define	SKEIN_SCHEMA_VER	SKEIN_MK_64(SKEIN_VERSION, SKEIN_ID_STRING_LE)
 #define	SKEIN_KS_PARITY		SKEIN_MK_64(0x1BD11BDA, 0xA9FC1A22)

 #define	SKEIN_CFG_STR_LEN	(4*8)

 /* bit field definitions in config block treeInfo word */
 #define	SKEIN_CFG_TREE_LEAF_SIZE_POS	(0)
 #define	SKEIN_CFG_TREE_NODE_SIZE_POS	(8)
 #define	SKEIN_CFG_TREE_MAX_LEVEL_POS	(16)

 #define	SKEIN_CFG_TREE_LEAF_SIZE_MSK	\
 	(((uint64_t)0xFF) << SKEIN_CFG_TREE_LEAF_SIZE_POS)
 #define	SKEIN_CFG_TREE_NODE_SIZE_MSK	\
 	(((uint64_t)0xFF) << SKEIN_CFG_TREE_NODE_SIZE_POS)
 #define	SKEIN_CFG_TREE_MAX_LEVEL_MSK	\
 	(((uint64_t)0xFF) << SKEIN_CFG_TREE_MAX_LEVEL_POS)

 #define	SKEIN_CFG_TREE_INFO(leaf, node, maxLvl)			\
 	((((uint64_t)(leaf)) << SKEIN_CFG_TREE_LEAF_SIZE_POS) |	\
 	(((uint64_t)(node)) << SKEIN_CFG_TREE_NODE_SIZE_POS) |	\
 	(((uint64_t)(maxLvl)) << SKEIN_CFG_TREE_MAX_LEVEL_POS))

 /* use as treeInfo in InitExt() call for sequential processing */
 #define	SKEIN_CFG_TREE_INFO_SEQUENTIAL	SKEIN_CFG_TREE_INFO(0, 0, 0)

 /*
  * Skein macros for getting/setting tweak words, etc.
  * These are useful for partial input bytes, hash tree init/update, etc.
  */
 #define	Skein_Get_Tweak(ctxPtr, TWK_NUM)	((ctxPtr)->h.T[TWK_NUM])
 #define	Skein_Set_Tweak(ctxPtr, TWK_NUM, tVal)		\
 	do {						\
 		(ctxPtr)->h.T[TWK_NUM] = (tVal);	\
 		_NOTE(CONSTCOND)			\
 	} while (0)

 #define	Skein_Get_T0(ctxPtr)		Skein_Get_Tweak(ctxPtr, 0)
 #define	Skein_Get_T1(ctxPtr)		Skein_Get_Tweak(ctxPtr, 1)
 #define	Skein_Set_T0(ctxPtr, T0)	Skein_Set_Tweak(ctxPtr, 0, T0)
 #define	Skein_Set_T1(ctxPtr, T1)	Skein_Set_Tweak(ctxPtr, 1, T1)

 /* set both tweak words at once */
 #define	Skein_Set_T0_T1(ctxPtr, T0, T1)		\
 	do {					\
 		Skein_Set_T0(ctxPtr, (T0));	\
 		Skein_Set_T1(ctxPtr, (T1));	\
 		_NOTE(CONSTCOND)		\
 	} while (0)

 #define	Skein_Set_Type(ctxPtr, BLK_TYPE)	\
 	Skein_Set_T1(ctxPtr, SKEIN_T1_BLK_TYPE_##BLK_TYPE)

 /*
  * set up for starting with a new type: h.T[0]=0; h.T[1] = NEW_TYPE; h.bCnt=0;
  */
 #define	Skein_Start_New_Type(ctxPtr, BLK_TYPE)				\
 	do {								\
 		Skein_Set_T0_T1(ctxPtr, 0, SKEIN_T1_FLAG_FIRST |	\
 		    SKEIN_T1_BLK_TYPE_ ## BLK_TYPE);			\
 		(ctxPtr)->h.bCnt = 0;	\
 		_NOTE(CONSTCOND)					\
 	} while (0)

 #define	Skein_Clear_First_Flag(hdr)					\
 	do {								\
 		(hdr).T[1] &= ~SKEIN_T1_FLAG_FIRST;			\
 		_NOTE(CONSTCOND)					\
 	} while (0)
 #define	Skein_Set_Bit_Pad_Flag(hdr)					\
 	do {								\
 		(hdr).T[1] |=  SKEIN_T1_FLAG_BIT_PAD;			\
 		_NOTE(CONSTCOND)					\
 	} while (0)

 #define	Skein_Set_Tree_Level(hdr, height)				\
 	do {								\
 		(hdr).T[1] |= SKEIN_T1_TREE_LEVEL(height);		\
 		_NOTE(CONSTCOND)					\
 	} while (0)

 /*
  * "Internal" Skein definitions for debugging and error checking
  * Note: in Illumos we always disable debugging features.
  */
 #define	Skein_Show_Block(bits, ctx, X, blkPtr, wPtr, ksEvenPtr, ksOddPtr)
 #define	Skein_Show_Round(bits, ctx, r, X)
 #define	Skein_Show_R_Ptr(bits, ctx, r, X_ptr)
 #define	Skein_Show_Final(bits, ctx, cnt, outPtr)
 #define	Skein_Show_Key(bits, ctx, key, keyBytes)

 /* run-time checks (e.g., bad params, uninitialized context)? */
 #ifndef	SKEIN_ERR_CHECK
 /* default: ignore all Asserts, for performance */
 #define	Skein_Assert(x, retCode)
 #define	Skein_assert(x)
 #elif	defined(SKEIN_ASSERT)
 #include <sys/debug.h>
 #define	Skein_Assert(x, retCode)	ASSERT(x)
 #define	Skein_assert(x)			ASSERT(x)
 #else
 #include <sys/debug.h>
 /*  caller error */
 #define	Skein_Assert(x, retCode)		\
 	do {					\
 		if (!(x))			\
 			return (retCode);	\
 		_NOTE(CONSTCOND)		\
 	} while (0)
 /* internal error */
 #define	Skein_assert(x)	ASSERT(x)
 #endif

 /*
  * Skein block function constants (shared across Ref and Opt code)
  */
 enum {
 	/* Skein_256 round rotation constants */
 	R_256_0_0 = 14, R_256_0_1 = 16,
 	R_256_1_0 = 52, R_256_1_1 = 57,
 	R_256_2_0 = 23, R_256_2_1 = 40,
 	R_256_3_0 = 5, R_256_3_1 = 37,
 	R_256_4_0 = 25, R_256_4_1 = 33,
 	R_256_5_0 = 46, R_256_5_1 = 12,
 	R_256_6_0 = 58, R_256_6_1 = 22,
 	R_256_7_0 = 32, R_256_7_1 = 32,

 	/* Skein_512 round rotation constants */
 	R_512_0_0 = 46, R_512_0_1 = 36, R_512_0_2 = 19, R_512_0_3 = 37,
 	R_512_1_0 = 33, R_512_1_1 = 27, R_512_1_2 = 14, R_512_1_3 = 42,
 	R_512_2_0 = 17, R_512_2_1 = 49, R_512_2_2 = 36, R_512_2_3 = 39,
 	R_512_3_0 = 44, R_512_3_1 = 9, R_512_3_2 = 54, R_512_3_3 = 56,
 	R_512_4_0 = 39, R_512_4_1 = 30, R_512_4_2 = 34, R_512_4_3 = 24,
 	R_512_5_0 = 13, R_512_5_1 = 50, R_512_5_2 = 10, R_512_5_3 = 17,
 	R_512_6_0 = 25, R_512_6_1 = 29, R_512_6_2 = 39, R_512_6_3 = 43,
 	R_512_7_0 = 8, R_512_7_1 = 35, R_512_7_2 = 56, R_512_7_3 = 22,

 	/* Skein1024 round rotation constants */
 	R1024_0_0 = 24, R1024_0_1 = 13, R1024_0_2 = 8, R1024_0_3 =
 	    47, R1024_0_4 = 8, R1024_0_5 = 17, R1024_0_6 = 22, R1024_0_7 = 37,
 	R1024_1_0 = 38, R1024_1_1 = 19, R1024_1_2 = 10, R1024_1_3 =
 	    55, R1024_1_4 = 49, R1024_1_5 = 18, R1024_1_6 = 23, R1024_1_7 = 52,
 	R1024_2_0 = 33, R1024_2_1 = 4, R1024_2_2 = 51, R1024_2_3 =
 	    13, R1024_2_4 = 34, R1024_2_5 = 41, R1024_2_6 = 59, R1024_2_7 = 17,
 	R1024_3_0 = 5, R1024_3_1 = 20, R1024_3_2 = 48, R1024_3_3 =
 	    41, R1024_3_4 = 47, R1024_3_5 = 28, R1024_3_6 = 16, R1024_3_7 = 25,
 	R1024_4_0 = 41, R1024_4_1 = 9, R1024_4_2 = 37, R1024_4_3 =
 	    31, R1024_4_4 = 12, R1024_4_5 = 47, R1024_4_6 = 44, R1024_4_7 = 30,
 	R1024_5_0 = 16, R1024_5_1 = 34, R1024_5_2 = 56, R1024_5_3 =
 	    51, R1024_5_4 = 4, R1024_5_5 = 53, R1024_5_6 = 42, R1024_5_7 = 41,
 	R1024_6_0 = 31, R1024_6_1 = 44, R1024_6_2 = 47, R1024_6_3 =
 	    46, R1024_6_4 = 19, R1024_6_5 = 42, R1024_6_6 = 44, R1024_6_7 = 25,
 	R1024_7_0 = 9, R1024_7_1 = 48, R1024_7_2 = 35, R1024_7_3 =
 	    52, R1024_7_4 = 23, R1024_7_5 = 31, R1024_7_6 = 37, R1024_7_7 = 20
 };

 /* number of rounds for the different block sizes */
 #define	SKEIN_256_ROUNDS_TOTAL	(72)
 #define	SKEIN_512_ROUNDS_TOTAL	(72)
 #define	SKEIN1024_ROUNDS_TOTAL	(80)


 extern const uint64_t SKEIN_256_IV_128[];
 extern const uint64_t SKEIN_256_IV_160[];
 extern const uint64_t SKEIN_256_IV_224[];
 extern const uint64_t SKEIN_256_IV_256[];
 extern const uint64_t SKEIN_512_IV_128[];
 extern const uint64_t SKEIN_512_IV_160[];
 extern const uint64_t SKEIN_512_IV_224[];
 extern const uint64_t SKEIN_512_IV_256[];
 extern const uint64_t SKEIN_512_IV_384[];
 extern const uint64_t SKEIN_512_IV_512[];
 extern const uint64_t SKEIN1024_IV_384[];
 extern const uint64_t SKEIN1024_IV_512[];
 extern const uint64_t SKEIN1024_IV_1024[];

 #endif	/* _SKEIN_IMPL_H_ */
	/*
	* Internal definitions for Skein hashing.
	* Source code author: Doug Whiting, 2008.
	* This algorithm and source code is released to the public domain.
	*
	* The following compile-time switches may be defined to control some
	* tradeoffs between speed, code size, error checking, and security.
	*
	* The "default" note explains what happens when the switch is not defined.
	*
	* SKEIN_DEBUG -- make callouts from inside Skein code
	* to examine/display intermediate values.
	* [default: no callouts (no overhead)]
	*
	* SKEIN_ERR_CHECK -- how error checking is handled inside Skein
	* code. If not defined, most error checking
	* is disabled (for performance). Otherwise,
	* the switch value is interpreted as:
	* 0: use assert() to flag errors
	* 1: return SKEIN_FAIL to flag errors
	*/
	/* Copyright 2013 Doug Whiting. This code is released to the public domain. */

	#ifndef _SKEIN_IMPL_H_
	#define _SKEIN_IMPL_H_

	#include <sys/skein.h>
	#include <sys/strings.h>
	#include <sys/note.h>
	#include "skein_impl.h"
	#include "skein_port.h"

	/*
	* "Internal" Skein definitions
	* -- not needed for sequential hashing API, but will be
	* helpful for other uses of Skein (e.g., tree hash mode).
	* -- included here so that they can be shared between
	* reference and optimized code.
	*/

	/* tweak word T[1]: bit field starting positions */
	/* offset 64 because it's the second word */
	#define SKEIN_T1_BIT(BIT) ((BIT) - 64)

	/* bits 112..118: level in hash tree */
	#define SKEIN_T1_POS_TREE_LVL SKEIN_T1_BIT(112)
	/* bit 119: partial final input byte */
	#define SKEIN_T1_POS_BIT_PAD SKEIN_T1_BIT(119)
	/* bits 120..125: type field */
	#define SKEIN_T1_POS_BLK_TYPE SKEIN_T1_BIT(120)
	/* bits 126: first block flag */
	#define SKEIN_T1_POS_FIRST SKEIN_T1_BIT(126)
	/* bit 127: final block flag */
	#define SKEIN_T1_POS_FINAL SKEIN_T1_BIT(127)

	/* tweak word T[1]: flag bit definition(s) */
	#define SKEIN_T1_FLAG_FIRST (((uint64_t)1) << SKEIN_T1_POS_FIRST)
	#define SKEIN_T1_FLAG_FINAL (((uint64_t)1) << SKEIN_T1_POS_FINAL)
	#define SKEIN_T1_FLAG_BIT_PAD (((uint64_t)1) << SKEIN_T1_POS_BIT_PAD)

	/* tweak word T[1]: tree level bit field mask */
	#define SKEIN_T1_TREE_LVL_MASK (((uint64_t)0x7F) << SKEIN_T1_POS_TREE_LVL)
	#define SKEIN_T1_TREE_LEVEL(n) (((uint64_t)(n)) << SKEIN_T1_POS_TREE_LVL)

	/* tweak word T[1]: block type field */
	#define SKEIN_BLK_TYPE_KEY (0) /* key, for MAC and KDF */
	#define SKEIN_BLK_TYPE_CFG (4) /* configuration block */
	#define SKEIN_BLK_TYPE_PERS (8) /* personalization string */
	#define SKEIN_BLK_TYPE_PK (12) /* public key (for signature hashing) */
	#define SKEIN_BLK_TYPE_KDF (16) /* key identifier for KDF */
	#define SKEIN_BLK_TYPE_NONCE (20) /* nonce for PRNG */
	#define SKEIN_BLK_TYPE_MSG (48) /* message processing */
	#define SKEIN_BLK_TYPE_OUT (63) /* output stage */
	#define SKEIN_BLK_TYPE_MASK (63) /* bit field mask */

	#define SKEIN_T1_BLK_TYPE(T) \
	(((uint64_t)(SKEIN_BLK_TYPE_##T)) << SKEIN_T1_POS_BLK_TYPE)
	/* key, for MAC and KDF */
	#define SKEIN_T1_BLK_TYPE_KEY SKEIN_T1_BLK_TYPE(KEY)
	/* configuration block */
	#define SKEIN_T1_BLK_TYPE_CFG SKEIN_T1_BLK_TYPE(CFG)
	/* personalization string */
	#define SKEIN_T1_BLK_TYPE_PERS SKEIN_T1_BLK_TYPE(PERS)
	/* public key (for digital signature hashing) */
	#define SKEIN_T1_BLK_TYPE_PK SKEIN_T1_BLK_TYPE(PK)
	/* key identifier for KDF */
	#define SKEIN_T1_BLK_TYPE_KDF SKEIN_T1_BLK_TYPE(KDF)
	/* nonce for PRNG */
	#define SKEIN_T1_BLK_TYPE_NONCE SKEIN_T1_BLK_TYPE(NONCE)
	/* message processing */
	#define SKEIN_T1_BLK_TYPE_MSG SKEIN_T1_BLK_TYPE(MSG)
	/* output stage */
	#define SKEIN_T1_BLK_TYPE_OUT SKEIN_T1_BLK_TYPE(OUT)
	/* field bit mask */
	#define SKEIN_T1_BLK_TYPE_MASK SKEIN_T1_BLK_TYPE(MASK)

	#define SKEIN_T1_BLK_TYPE_CFG_FINAL \
	(SKEIN_T1_BLK_TYPE_CFG \| SKEIN_T1_FLAG_FINAL)
	#define SKEIN_T1_BLK_TYPE_OUT_FINAL \
	(SKEIN_T1_BLK_TYPE_OUT \| SKEIN_T1_FLAG_FINAL)

	#define SKEIN_VERSION (1)

	#ifndef SKEIN_ID_STRING_LE /* allow compile-time personalization */
	#define SKEIN_ID_STRING_LE (0x33414853) /* "SHA3" (little-endian) */
	#endif

	#define SKEIN_MK_64(hi32, lo32) ((lo32) + (((uint64_t)(hi32)) << 32))
	#define SKEIN_SCHEMA_VER SKEIN_MK_64(SKEIN_VERSION, SKEIN_ID_STRING_LE)
	#define SKEIN_KS_PARITY SKEIN_MK_64(0x1BD11BDA, 0xA9FC1A22)

	#define SKEIN_CFG_STR_LEN (4*8)

	/* bit field definitions in config block treeInfo word */
	#define SKEIN_CFG_TREE_LEAF_SIZE_POS (0)
	#define SKEIN_CFG_TREE_NODE_SIZE_POS (8)
	#define SKEIN_CFG_TREE_MAX_LEVEL_POS (16)

	#define SKEIN_CFG_TREE_LEAF_SIZE_MSK \
	(((uint64_t)0xFF) << SKEIN_CFG_TREE_LEAF_SIZE_POS)
	#define SKEIN_CFG_TREE_NODE_SIZE_MSK \
	(((uint64_t)0xFF) << SKEIN_CFG_TREE_NODE_SIZE_POS)
	#define SKEIN_CFG_TREE_MAX_LEVEL_MSK \
	(((uint64_t)0xFF) << SKEIN_CFG_TREE_MAX_LEVEL_POS)

	#define SKEIN_CFG_TREE_INFO(leaf, node, maxLvl) \
	((((uint64_t)(leaf)) << SKEIN_CFG_TREE_LEAF_SIZE_POS) \| \
	(((uint64_t)(node)) << SKEIN_CFG_TREE_NODE_SIZE_POS) \| \
	(((uint64_t)(maxLvl)) << SKEIN_CFG_TREE_MAX_LEVEL_POS))

	/* use as treeInfo in InitExt() call for sequential processing */
	#define SKEIN_CFG_TREE_INFO_SEQUENTIAL SKEIN_CFG_TREE_INFO(0, 0, 0)

	/*
	* Skein macros for getting/setting tweak words, etc.
	* These are useful for partial input bytes, hash tree init/update, etc.
	*/
	#define Skein_Get_Tweak(ctxPtr, TWK_NUM) ((ctxPtr)->h.T[TWK_NUM])
	#define Skein_Set_Tweak(ctxPtr, TWK_NUM, tVal) \
	do { \
	(ctxPtr)->h.T[TWK_NUM] = (tVal); \
	_NOTE(CONSTCOND) \
	} while (0)

	#define Skein_Get_T0(ctxPtr) Skein_Get_Tweak(ctxPtr, 0)
	#define Skein_Get_T1(ctxPtr) Skein_Get_Tweak(ctxPtr, 1)
	#define Skein_Set_T0(ctxPtr, T0) Skein_Set_Tweak(ctxPtr, 0, T0)
	#define Skein_Set_T1(ctxPtr, T1) Skein_Set_Tweak(ctxPtr, 1, T1)

	/* set both tweak words at once */
	#define Skein_Set_T0_T1(ctxPtr, T0, T1) \
	do { \
	Skein_Set_T0(ctxPtr, (T0)); \
	Skein_Set_T1(ctxPtr, (T1)); \
	_NOTE(CONSTCOND) \
	} while (0)

	#define Skein_Set_Type(ctxPtr, BLK_TYPE) \
	Skein_Set_T1(ctxPtr, SKEIN_T1_BLK_TYPE_##BLK_TYPE)

	/*
	* set up for starting with a new type: h.T[0]=0; h.T[1] = NEW_TYPE; h.bCnt=0;
	*/
	#define Skein_Start_New_Type(ctxPtr, BLK_TYPE) \
	do { \
	Skein_Set_T0_T1(ctxPtr, 0, SKEIN_T1_FLAG_FIRST \| \
	SKEIN_T1_BLK_TYPE_ ## BLK_TYPE); \
	(ctxPtr)->h.bCnt = 0; \
	_NOTE(CONSTCOND) \
	} while (0)

	#define Skein_Clear_First_Flag(hdr) \
	do { \
	(hdr).T[1] &= ~SKEIN_T1_FLAG_FIRST; \
	_NOTE(CONSTCOND) \
	} while (0)
	#define Skein_Set_Bit_Pad_Flag(hdr) \
	do { \
	(hdr).T[1] \|= SKEIN_T1_FLAG_BIT_PAD; \
	_NOTE(CONSTCOND) \
	} while (0)

	#define Skein_Set_Tree_Level(hdr, height) \
	do { \
	(hdr).T[1] \|= SKEIN_T1_TREE_LEVEL(height); \
	_NOTE(CONSTCOND) \
	} while (0)

	/*
	* "Internal" Skein definitions for debugging and error checking
	* Note: in Illumos we always disable debugging features.
	*/
	#define Skein_Show_Block(bits, ctx, X, blkPtr, wPtr, ksEvenPtr, ksOddPtr)
	#define Skein_Show_Round(bits, ctx, r, X)
	#define Skein_Show_R_Ptr(bits, ctx, r, X_ptr)
	#define Skein_Show_Final(bits, ctx, cnt, outPtr)
	#define Skein_Show_Key(bits, ctx, key, keyBytes)

	/* run-time checks (e.g., bad params, uninitialized context)? */
	#ifndef SKEIN_ERR_CHECK
	/* default: ignore all Asserts, for performance */
	#define Skein_Assert(x, retCode)
	#define Skein_assert(x)
	#elif defined(SKEIN_ASSERT)
	#include <sys/debug.h>
	#define Skein_Assert(x, retCode) ASSERT(x)
	#define Skein_assert(x) ASSERT(x)
	#else
	#include <sys/debug.h>
	/* caller error */
	#define Skein_Assert(x, retCode) \
	do { \
	if (!(x)) \
	return (retCode); \
	_NOTE(CONSTCOND) \
	} while (0)
	/* internal error */
	#define Skein_assert(x) ASSERT(x)
	#endif

	/*
	* Skein block function constants (shared across Ref and Opt code)
	*/
	enum {
	/* Skein_256 round rotation constants */
	R_256_0_0 = 14, R_256_0_1 = 16,
	R_256_1_0 = 52, R_256_1_1 = 57,
	R_256_2_0 = 23, R_256_2_1 = 40,
	R_256_3_0 = 5, R_256_3_1 = 37,
	R_256_4_0 = 25, R_256_4_1 = 33,
	R_256_5_0 = 46, R_256_5_1 = 12,
	R_256_6_0 = 58, R_256_6_1 = 22,
	R_256_7_0 = 32, R_256_7_1 = 32,

	/* Skein_512 round rotation constants */
	R_512_0_0 = 46, R_512_0_1 = 36, R_512_0_2 = 19, R_512_0_3 = 37,
	R_512_1_0 = 33, R_512_1_1 = 27, R_512_1_2 = 14, R_512_1_3 = 42,
	R_512_2_0 = 17, R_512_2_1 = 49, R_512_2_2 = 36, R_512_2_3 = 39,
	R_512_3_0 = 44, R_512_3_1 = 9, R_512_3_2 = 54, R_512_3_3 = 56,
	R_512_4_0 = 39, R_512_4_1 = 30, R_512_4_2 = 34, R_512_4_3 = 24,
	R_512_5_0 = 13, R_512_5_1 = 50, R_512_5_2 = 10, R_512_5_3 = 17,
	R_512_6_0 = 25, R_512_6_1 = 29, R_512_6_2 = 39, R_512_6_3 = 43,
	R_512_7_0 = 8, R_512_7_1 = 35, R_512_7_2 = 56, R_512_7_3 = 22,

	/* Skein1024 round rotation constants */
	R1024_0_0 = 24, R1024_0_1 = 13, R1024_0_2 = 8, R1024_0_3 =
	47, R1024_0_4 = 8, R1024_0_5 = 17, R1024_0_6 = 22, R1024_0_7 = 37,
	R1024_1_0 = 38, R1024_1_1 = 19, R1024_1_2 = 10, R1024_1_3 =
	55, R1024_1_4 = 49, R1024_1_5 = 18, R1024_1_6 = 23, R1024_1_7 = 52,
	R1024_2_0 = 33, R1024_2_1 = 4, R1024_2_2 = 51, R1024_2_3 =
	13, R1024_2_4 = 34, R1024_2_5 = 41, R1024_2_6 = 59, R1024_2_7 = 17,
	R1024_3_0 = 5, R1024_3_1 = 20, R1024_3_2 = 48, R1024_3_3 =
	41, R1024_3_4 = 47, R1024_3_5 = 28, R1024_3_6 = 16, R1024_3_7 = 25,
	R1024_4_0 = 41, R1024_4_1 = 9, R1024_4_2 = 37, R1024_4_3 =
	31, R1024_4_4 = 12, R1024_4_5 = 47, R1024_4_6 = 44, R1024_4_7 = 30,
	R1024_5_0 = 16, R1024_5_1 = 34, R1024_5_2 = 56, R1024_5_3 =
	51, R1024_5_4 = 4, R1024_5_5 = 53, R1024_5_6 = 42, R1024_5_7 = 41,
	R1024_6_0 = 31, R1024_6_1 = 44, R1024_6_2 = 47, R1024_6_3 =
	46, R1024_6_4 = 19, R1024_6_5 = 42, R1024_6_6 = 44, R1024_6_7 = 25,
	R1024_7_0 = 9, R1024_7_1 = 48, R1024_7_2 = 35, R1024_7_3 =
	52, R1024_7_4 = 23, R1024_7_5 = 31, R1024_7_6 = 37, R1024_7_7 = 20
	};

	/* number of rounds for the different block sizes */
	#define SKEIN_256_ROUNDS_TOTAL (72)
	#define SKEIN_512_ROUNDS_TOTAL (72)
	#define SKEIN1024_ROUNDS_TOTAL (80)


	extern const uint64_t SKEIN_256_IV_128[];
	extern const uint64_t SKEIN_256_IV_160[];
	extern const uint64_t SKEIN_256_IV_224[];
	extern const uint64_t SKEIN_256_IV_256[];
	extern const uint64_t SKEIN_512_IV_128[];
	extern const uint64_t SKEIN_512_IV_160[];
	extern const uint64_t SKEIN_512_IV_224[];
	extern const uint64_t SKEIN_512_IV_256[];
	extern const uint64_t SKEIN_512_IV_384[];
	extern const uint64_t SKEIN_512_IV_512[];
	extern const uint64_t SKEIN1024_IV_384[];
	extern const uint64_t SKEIN1024_IV_512[];
	extern const uint64_t SKEIN1024_IV_1024[];

	#endif /* _SKEIN_IMPL_H_ */