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Editing: skein.h

/*	$FreeBSD$	*/
#ifndef _SKEIN_H_
#define _SKEIN_H_     1
/**************************************************************************
**
** Interface declarations and 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
**
***************************************************************************/
#ifdef __cplusplus
extern "C"
{
#endif

#ifndef _KERNEL
#include <stddef.h>                          /* get size_t definition */
#endif
#include "skein_port.h"                      /* get platform-specific definitions */

enum
    {
    SKEIN_SUCCESS         =      0,          /* return codes from Skein calls */
    SKEIN_FAIL            =      1,
    SKEIN_BAD_HASHLEN     =      2
    };

#define  SKEIN_MODIFIER_WORDS  ( 2)          /* number of modifier (tweak) words */

#define  SKEIN_256_STATE_WORDS ( 4)
#define  SKEIN_512_STATE_WORDS ( 8)
#define  SKEIN1024_STATE_WORDS (16)
#define  SKEIN_MAX_STATE_WORDS (16)

#define  SKEIN_256_STATE_BYTES ( 8*SKEIN_256_STATE_WORDS)
#define  SKEIN_512_STATE_BYTES ( 8*SKEIN_512_STATE_WORDS)
#define  SKEIN1024_STATE_BYTES ( 8*SKEIN1024_STATE_WORDS)

#define  SKEIN_256_STATE_BITS  (64*SKEIN_256_STATE_WORDS)
#define  SKEIN_512_STATE_BITS  (64*SKEIN_512_STATE_WORDS)
#define  SKEIN1024_STATE_BITS  (64*SKEIN1024_STATE_WORDS)

#define  SKEIN_256_BLOCK_BYTES ( 8*SKEIN_256_STATE_WORDS)
#define  SKEIN_512_BLOCK_BYTES ( 8*SKEIN_512_STATE_WORDS)
#define  SKEIN1024_BLOCK_BYTES ( 8*SKEIN1024_STATE_WORDS)

typedef struct
    {
    size_t  hashBitLen;                      /* size of hash result, in bits */
    size_t  bCnt;                            /* current byte count in buffer b[] */
    u64b_t  T[SKEIN_MODIFIER_WORDS];         /* tweak words: T[0]=byte cnt, T[1]=flags */
    } Skein_Ctxt_Hdr_t;

typedef struct                               /*  256-bit Skein hash context structure */
    {
    Skein_Ctxt_Hdr_t h;                      /* common header context variables */
    u64b_t  X[SKEIN_256_STATE_WORDS];        /* chaining variables */
    u08b_t  b[SKEIN_256_BLOCK_BYTES];        /* partial block buffer (8-byte aligned) */
    } Skein_256_Ctxt_t;

typedef struct                               /*  512-bit Skein hash context structure */
    {
    Skein_Ctxt_Hdr_t h;                      /* common header context variables */
    u64b_t  X[SKEIN_512_STATE_WORDS];        /* chaining variables */
    u08b_t  b[SKEIN_512_BLOCK_BYTES];        /* partial block buffer (8-byte aligned) */
    } Skein_512_Ctxt_t;

typedef struct                               /* 1024-bit Skein hash context structure */
    {
    Skein_Ctxt_Hdr_t h;                      /* common header context variables */
    u64b_t  X[SKEIN1024_STATE_WORDS];        /* chaining variables */
    u08b_t  b[SKEIN1024_BLOCK_BYTES];        /* partial block buffer (8-byte aligned) */
    } Skein1024_Ctxt_t;

/*   Skein APIs for (incremental) "straight hashing" */
int  Skein_256_Init  (Skein_256_Ctxt_t *ctx, size_t hashBitLen);
int  Skein_512_Init  (Skein_512_Ctxt_t *ctx, size_t hashBitLen);
int  Skein1024_Init  (Skein1024_Ctxt_t *ctx, size_t hashBitLen);

int  Skein_256_Update(Skein_256_Ctxt_t *ctx, const u08b_t *msg, size_t msgByteCnt);
int  Skein_512_Update(Skein_512_Ctxt_t *ctx, const u08b_t *msg, size_t msgByteCnt);
int  Skein1024_Update(Skein1024_Ctxt_t *ctx, const u08b_t *msg, size_t msgByteCnt);

int  Skein_256_Final (Skein_256_Ctxt_t *ctx, u08b_t * hashVal);
int  Skein_512_Final (Skein_512_Ctxt_t *ctx, u08b_t * hashVal);
int  Skein1024_Final (Skein1024_Ctxt_t *ctx, u08b_t * hashVal);

/*
**   Skein APIs for "extended" initialization: MAC keys, tree hashing.
**   After an InitExt() call, just use Update/Final calls as with Init().
**
**   Notes: Same parameters as _Init() calls, plus treeInfo/key/keyBytes.
**          When keyBytes == 0 and treeInfo == SKEIN_SEQUENTIAL, 
**              the results of InitExt() are identical to calling Init().
**          The function Init() may be called once to "precompute" the IV for
**              a given hashBitLen value, then by saving a copy of the context
**              the IV computation may be avoided in later calls.
**          Similarly, the function InitExt() may be called once per MAC key 
**              to precompute the MAC IV, then a copy of the context saved and
**              reused for each new MAC computation.
**/
int  Skein_256_InitExt(Skein_256_Ctxt_t *ctx, size_t hashBitLen, u64b_t treeInfo, const u08b_t *key, size_t keyBytes);
int  Skein_512_InitExt(Skein_512_Ctxt_t *ctx, size_t hashBitLen, u64b_t treeInfo, const u08b_t *key, size_t keyBytes);
int  Skein1024_InitExt(Skein1024_Ctxt_t *ctx, size_t hashBitLen, u64b_t treeInfo, const u08b_t *key, size_t keyBytes);

/*
**   Skein APIs for MAC and tree hash:
**      Final_Pad:  pad, do final block, but no OUTPUT type
**      Output:     do just the output stage
*/
int  Skein_256_Final_Pad(Skein_256_Ctxt_t *ctx, u08b_t * hashVal);
int  Skein_512_Final_Pad(Skein_512_Ctxt_t *ctx, u08b_t * hashVal);
int  Skein1024_Final_Pad(Skein1024_Ctxt_t *ctx, u08b_t * hashVal);

#ifndef SKEIN_TREE_HASH
#define SKEIN_TREE_HASH (1)
#endif
#if  SKEIN_TREE_HASH
int  Skein_256_Output   (Skein_256_Ctxt_t *ctx, u08b_t * hashVal);
int  Skein_512_Output   (Skein_512_Ctxt_t *ctx, u08b_t * hashVal);
int  Skein1024_Output   (Skein1024_Ctxt_t *ctx, u08b_t * hashVal);
#endif

/*****************************************************************
** "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 */
#define SKEIN_T1_BIT(BIT)       ((BIT) - 64)            /* offset 64 because it's the second word  */
                                
#define SKEIN_T1_POS_TREE_LVL   SKEIN_T1_BIT(112)       /* bits 112..118: level in hash tree       */
#define SKEIN_T1_POS_BIT_PAD    SKEIN_T1_BIT(119)       /* bit  119     : partial final input byte */
#define SKEIN_T1_POS_BLK_TYPE   SKEIN_T1_BIT(120)       /* bits 120..125: type field               */
#define SKEIN_T1_POS_FIRST      SKEIN_T1_BIT(126)       /* bits 126     : first block flag         */
#define SKEIN_T1_POS_FINAL      SKEIN_T1_BIT(127)       /* bit  127     : final block flag         */
                                
/* tweak word T[1]: flag bit definition(s) */
#define SKEIN_T1_FLAG_FIRST     (((u64b_t)  1 ) << SKEIN_T1_POS_FIRST)
#define SKEIN_T1_FLAG_FINAL     (((u64b_t)  1 ) << SKEIN_T1_POS_FINAL)
#define SKEIN_T1_FLAG_BIT_PAD   (((u64b_t)  1 ) << SKEIN_T1_POS_BIT_PAD)
                                
/* tweak word T[1]: tree level bit field mask */
#define SKEIN_T1_TREE_LVL_MASK  (((u64b_t)0x7F) << SKEIN_T1_POS_TREE_LVL)
#define SKEIN_T1_TREE_LEVEL(n)  (((u64b_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 digital 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)   (((u64b_t) (SKEIN_BLK_TYPE_##T)) << SKEIN_T1_POS_BLK_TYPE)
#define SKEIN_T1_BLK_TYPE_KEY   SKEIN_T1_BLK_TYPE(KEY)  /* key, for MAC and KDF */
#define SKEIN_T1_BLK_TYPE_CFG   SKEIN_T1_BLK_TYPE(CFG)  /* configuration block */
#define SKEIN_T1_BLK_TYPE_PERS  SKEIN_T1_BLK_TYPE(PERS) /* personalization string */
#define SKEIN_T1_BLK_TYPE_PK    SKEIN_T1_BLK_TYPE(PK)   /* public key (for digital signature hashing) */
#define SKEIN_T1_BLK_TYPE_KDF   SKEIN_T1_BLK_TYPE(KDF)  /* key identifier for KDF */
#define SKEIN_T1_BLK_TYPE_NONCE SKEIN_T1_BLK_TYPE(NONCE)/* nonce for PRNG */
#define SKEIN_T1_BLK_TYPE_MSG   SKEIN_T1_BLK_TYPE(MSG)  /* message processing */
#define SKEIN_T1_BLK_TYPE_OUT   SKEIN_T1_BLK_TYPE(OUT)  /* output stage */
#define SKEIN_T1_BLK_TYPE_MASK  SKEIN_T1_BLK_TYPE(MASK) /* field bit 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) + (((u64b_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  (((u64b_t) 0xFF) << SKEIN_CFG_TREE_LEAF_SIZE_POS)
#define SKEIN_CFG_TREE_NODE_SIZE_MSK  (((u64b_t) 0xFF) << SKEIN_CFG_TREE_NODE_SIZE_POS)
#define SKEIN_CFG_TREE_MAX_LEVEL_MSK  (((u64b_t) 0xFF) << SKEIN_CFG_TREE_MAX_LEVEL_POS)

#define SKEIN_CFG_TREE_INFO(leaf,node,maxLvl)                   \
    ( (((u64b_t)(leaf  )) << SKEIN_CFG_TREE_LEAF_SIZE_POS) |    \
      (((u64b_t)(node  )) << SKEIN_CFG_TREE_NODE_SIZE_POS) |    \
      (((u64b_t)(maxLvl)) << SKEIN_CFG_TREE_MAX_LEVEL_POS) )

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

/*
**   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)    {(ctxPtr)->h.T[TWK_NUM] = (tVal);}

#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)           \
    {                                           \
    Skein_Set_T0(ctxPtr,(T0));                  \
    Skein_Set_T1(ctxPtr,(T1));                  \
    }

#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)   \
    { Skein_Set_T0_T1(ctxPtr,0,SKEIN_T1_FLAG_FIRST | SKEIN_T1_BLK_TYPE_##BLK_TYPE); (ctxPtr)->h.bCnt=0; }

#define Skein_Clear_First_Flag(hdr)      { (hdr).T[1] &= ~SKEIN_T1_FLAG_FIRST;       }
#define Skein_Set_Bit_Pad_Flag(hdr)      { (hdr).T[1] |=  SKEIN_T1_FLAG_BIT_PAD;     }

#define Skein_Set_Tree_Level(hdr,height) { (hdr).T[1] |= SKEIN_T1_TREE_LEVEL(height);}

/*****************************************************************
** "Internal" Skein definitions for debugging and error checking
******************************************************************/
#ifdef  SKEIN_DEBUG             /* examine/display intermediate values? */
#include "skein_debug.h"
#else                           /* default is no callouts */
#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)
#endif

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

#ifndef SKEIN_ROUNDS
#define SKEIN_256_ROUNDS_TOTAL (72)          /* number of rounds for the different block sizes */
#define SKEIN_512_ROUNDS_TOTAL (72)
#define SKEIN1024_ROUNDS_TOTAL (80)
#else                                        /* allow command-line define in range 8*(5..14)   */
#define SKEIN_256_ROUNDS_TOTAL (8*((((SKEIN_ROUNDS/100) + 5) % 10) + 5))
#define SKEIN_512_ROUNDS_TOTAL (8*((((SKEIN_ROUNDS/ 10) + 5) % 10) + 5))
#define SKEIN1024_ROUNDS_TOTAL (8*((((SKEIN_ROUNDS    ) + 5) % 10) + 5))
#endif

#ifdef __cplusplus
}
#endif

/* Pull in FreeBSD specific shims */
#include "skein_freebsd.h"

#endif  /* ifndef _SKEIN_H_ */

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