293 lines
11 KiB
C
293 lines
11 KiB
C
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/*
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* Internal definitions for Skein hashing.
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* Source code author: Doug Whiting, 2008.
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* This algorithm and source code is released to the public domain.
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*
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* The following compile-time switches may be defined to control some
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* tradeoffs between speed, code size, error checking, and security.
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*
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* The "default" note explains what happens when the switch is not defined.
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*
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* SKEIN_DEBUG -- make callouts from inside Skein code
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* to examine/display intermediate values.
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* [default: no callouts (no overhead)]
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*
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* SKEIN_ERR_CHECK -- how error checking is handled inside Skein
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* code. If not defined, most error checking
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* is disabled (for performance). Otherwise,
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* the switch value is interpreted as:
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* 0: use assert() to flag errors
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* 1: return SKEIN_FAIL to flag errors
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*/
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/* Copyright 2013 Doug Whiting. This code is released to the public domain. */
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#ifndef _SKEIN_IMPL_H_
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#define _SKEIN_IMPL_H_
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#include <sys/skein.h>
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#include <sys/strings.h>
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#include <sys/note.h>
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#include "skein_impl.h"
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#include "skein_port.h"
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/*
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* "Internal" Skein definitions
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* -- not needed for sequential hashing API, but will be
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* helpful for other uses of Skein (e.g., tree hash mode).
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* -- included here so that they can be shared between
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* reference and optimized code.
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*/
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/* tweak word T[1]: bit field starting positions */
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/* offset 64 because it's the second word */
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#define SKEIN_T1_BIT(BIT) ((BIT) - 64)
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/* bits 112..118: level in hash tree */
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#define SKEIN_T1_POS_TREE_LVL SKEIN_T1_BIT(112)
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/* bit 119: partial final input byte */
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#define SKEIN_T1_POS_BIT_PAD SKEIN_T1_BIT(119)
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/* bits 120..125: type field */
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#define SKEIN_T1_POS_BLK_TYPE SKEIN_T1_BIT(120)
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/* bits 126: first block flag */
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#define SKEIN_T1_POS_FIRST SKEIN_T1_BIT(126)
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/* bit 127: final block flag */
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#define SKEIN_T1_POS_FINAL SKEIN_T1_BIT(127)
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/* tweak word T[1]: flag bit definition(s) */
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#define SKEIN_T1_FLAG_FIRST (((uint64_t)1) << SKEIN_T1_POS_FIRST)
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#define SKEIN_T1_FLAG_FINAL (((uint64_t)1) << SKEIN_T1_POS_FINAL)
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#define SKEIN_T1_FLAG_BIT_PAD (((uint64_t)1) << SKEIN_T1_POS_BIT_PAD)
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/* tweak word T[1]: tree level bit field mask */
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#define SKEIN_T1_TREE_LVL_MASK (((uint64_t)0x7F) << SKEIN_T1_POS_TREE_LVL)
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#define SKEIN_T1_TREE_LEVEL(n) (((uint64_t)(n)) << SKEIN_T1_POS_TREE_LVL)
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/* tweak word T[1]: block type field */
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#define SKEIN_BLK_TYPE_KEY (0) /* key, for MAC and KDF */
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#define SKEIN_BLK_TYPE_CFG (4) /* configuration block */
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#define SKEIN_BLK_TYPE_PERS (8) /* personalization string */
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#define SKEIN_BLK_TYPE_PK (12) /* public key (for signature hashing) */
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#define SKEIN_BLK_TYPE_KDF (16) /* key identifier for KDF */
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#define SKEIN_BLK_TYPE_NONCE (20) /* nonce for PRNG */
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#define SKEIN_BLK_TYPE_MSG (48) /* message processing */
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#define SKEIN_BLK_TYPE_OUT (63) /* output stage */
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#define SKEIN_BLK_TYPE_MASK (63) /* bit field mask */
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#define SKEIN_T1_BLK_TYPE(T) \
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(((uint64_t)(SKEIN_BLK_TYPE_##T)) << SKEIN_T1_POS_BLK_TYPE)
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/* key, for MAC and KDF */
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#define SKEIN_T1_BLK_TYPE_KEY SKEIN_T1_BLK_TYPE(KEY)
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/* configuration block */
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#define SKEIN_T1_BLK_TYPE_CFG SKEIN_T1_BLK_TYPE(CFG)
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/* personalization string */
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#define SKEIN_T1_BLK_TYPE_PERS SKEIN_T1_BLK_TYPE(PERS)
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/* public key (for digital signature hashing) */
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#define SKEIN_T1_BLK_TYPE_PK SKEIN_T1_BLK_TYPE(PK)
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/* key identifier for KDF */
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#define SKEIN_T1_BLK_TYPE_KDF SKEIN_T1_BLK_TYPE(KDF)
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/* nonce for PRNG */
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#define SKEIN_T1_BLK_TYPE_NONCE SKEIN_T1_BLK_TYPE(NONCE)
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/* message processing */
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#define SKEIN_T1_BLK_TYPE_MSG SKEIN_T1_BLK_TYPE(MSG)
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/* output stage */
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#define SKEIN_T1_BLK_TYPE_OUT SKEIN_T1_BLK_TYPE(OUT)
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/* field bit mask */
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#define SKEIN_T1_BLK_TYPE_MASK SKEIN_T1_BLK_TYPE(MASK)
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#define SKEIN_T1_BLK_TYPE_CFG_FINAL \
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(SKEIN_T1_BLK_TYPE_CFG | SKEIN_T1_FLAG_FINAL)
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#define SKEIN_T1_BLK_TYPE_OUT_FINAL \
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(SKEIN_T1_BLK_TYPE_OUT | SKEIN_T1_FLAG_FINAL)
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#define SKEIN_VERSION (1)
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#ifndef SKEIN_ID_STRING_LE /* allow compile-time personalization */
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#define SKEIN_ID_STRING_LE (0x33414853) /* "SHA3" (little-endian) */
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#endif
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#define SKEIN_MK_64(hi32, lo32) ((lo32) + (((uint64_t)(hi32)) << 32))
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#define SKEIN_SCHEMA_VER SKEIN_MK_64(SKEIN_VERSION, SKEIN_ID_STRING_LE)
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#define SKEIN_KS_PARITY SKEIN_MK_64(0x1BD11BDA, 0xA9FC1A22)
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#define SKEIN_CFG_STR_LEN (4*8)
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/* bit field definitions in config block treeInfo word */
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#define SKEIN_CFG_TREE_LEAF_SIZE_POS (0)
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#define SKEIN_CFG_TREE_NODE_SIZE_POS (8)
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#define SKEIN_CFG_TREE_MAX_LEVEL_POS (16)
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#define SKEIN_CFG_TREE_LEAF_SIZE_MSK \
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(((uint64_t)0xFF) << SKEIN_CFG_TREE_LEAF_SIZE_POS)
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#define SKEIN_CFG_TREE_NODE_SIZE_MSK \
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(((uint64_t)0xFF) << SKEIN_CFG_TREE_NODE_SIZE_POS)
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#define SKEIN_CFG_TREE_MAX_LEVEL_MSK \
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(((uint64_t)0xFF) << SKEIN_CFG_TREE_MAX_LEVEL_POS)
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#define SKEIN_CFG_TREE_INFO(leaf, node, maxLvl) \
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((((uint64_t)(leaf)) << SKEIN_CFG_TREE_LEAF_SIZE_POS) | \
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(((uint64_t)(node)) << SKEIN_CFG_TREE_NODE_SIZE_POS) | \
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(((uint64_t)(maxLvl)) << SKEIN_CFG_TREE_MAX_LEVEL_POS))
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/* use as treeInfo in InitExt() call for sequential processing */
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#define SKEIN_CFG_TREE_INFO_SEQUENTIAL SKEIN_CFG_TREE_INFO(0, 0, 0)
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/*
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* Skein macros for getting/setting tweak words, etc.
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* These are useful for partial input bytes, hash tree init/update, etc.
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*/
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#define Skein_Get_Tweak(ctxPtr, TWK_NUM) ((ctxPtr)->h.T[TWK_NUM])
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#define Skein_Set_Tweak(ctxPtr, TWK_NUM, tVal) \
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do { \
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(ctxPtr)->h.T[TWK_NUM] = (tVal); \
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_NOTE(CONSTCOND) \
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} while (0)
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#define Skein_Get_T0(ctxPtr) Skein_Get_Tweak(ctxPtr, 0)
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#define Skein_Get_T1(ctxPtr) Skein_Get_Tweak(ctxPtr, 1)
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#define Skein_Set_T0(ctxPtr, T0) Skein_Set_Tweak(ctxPtr, 0, T0)
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#define Skein_Set_T1(ctxPtr, T1) Skein_Set_Tweak(ctxPtr, 1, T1)
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/* set both tweak words at once */
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#define Skein_Set_T0_T1(ctxPtr, T0, T1) \
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do { \
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Skein_Set_T0(ctxPtr, (T0)); \
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Skein_Set_T1(ctxPtr, (T1)); \
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_NOTE(CONSTCOND) \
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} while (0)
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#define Skein_Set_Type(ctxPtr, BLK_TYPE) \
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Skein_Set_T1(ctxPtr, SKEIN_T1_BLK_TYPE_##BLK_TYPE)
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/*
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* set up for starting with a new type: h.T[0]=0; h.T[1] = NEW_TYPE; h.bCnt=0;
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*/
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#define Skein_Start_New_Type(ctxPtr, BLK_TYPE) \
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do { \
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Skein_Set_T0_T1(ctxPtr, 0, SKEIN_T1_FLAG_FIRST | \
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SKEIN_T1_BLK_TYPE_ ## BLK_TYPE); \
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(ctxPtr)->h.bCnt = 0; \
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_NOTE(CONSTCOND) \
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} while (0)
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#define Skein_Clear_First_Flag(hdr) \
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do { \
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(hdr).T[1] &= ~SKEIN_T1_FLAG_FIRST; \
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_NOTE(CONSTCOND) \
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} while (0)
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#define Skein_Set_Bit_Pad_Flag(hdr) \
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do { \
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(hdr).T[1] |= SKEIN_T1_FLAG_BIT_PAD; \
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_NOTE(CONSTCOND) \
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} while (0)
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#define Skein_Set_Tree_Level(hdr, height) \
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do { \
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(hdr).T[1] |= SKEIN_T1_TREE_LEVEL(height); \
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_NOTE(CONSTCOND) \
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} while (0)
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/*
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* "Internal" Skein definitions for debugging and error checking
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* Note: in Illumos we always disable debugging features.
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*/
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#define Skein_Show_Block(bits, ctx, X, blkPtr, wPtr, ksEvenPtr, ksOddPtr)
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#define Skein_Show_Round(bits, ctx, r, X)
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#define Skein_Show_R_Ptr(bits, ctx, r, X_ptr)
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#define Skein_Show_Final(bits, ctx, cnt, outPtr)
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#define Skein_Show_Key(bits, ctx, key, keyBytes)
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/* run-time checks (e.g., bad params, uninitialized context)? */
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#ifndef SKEIN_ERR_CHECK
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/* default: ignore all Asserts, for performance */
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#define Skein_Assert(x, retCode)
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#define Skein_assert(x)
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#elif defined(SKEIN_ASSERT)
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#include <sys/debug.h>
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#define Skein_Assert(x, retCode) ASSERT(x)
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#define Skein_assert(x) ASSERT(x)
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#else
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#include <sys/debug.h>
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/* caller error */
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#define Skein_Assert(x, retCode) \
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do { \
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if (!(x)) \
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return (retCode); \
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_NOTE(CONSTCOND) \
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} while (0)
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/* internal error */
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#define Skein_assert(x) ASSERT(x)
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#endif
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/*
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* Skein block function constants (shared across Ref and Opt code)
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*/
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enum {
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/* Skein_256 round rotation constants */
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R_256_0_0 = 14, R_256_0_1 = 16,
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R_256_1_0 = 52, R_256_1_1 = 57,
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R_256_2_0 = 23, R_256_2_1 = 40,
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R_256_3_0 = 5, R_256_3_1 = 37,
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R_256_4_0 = 25, R_256_4_1 = 33,
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R_256_5_0 = 46, R_256_5_1 = 12,
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R_256_6_0 = 58, R_256_6_1 = 22,
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R_256_7_0 = 32, R_256_7_1 = 32,
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/* Skein_512 round rotation constants */
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R_512_0_0 = 46, R_512_0_1 = 36, R_512_0_2 = 19, R_512_0_3 = 37,
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R_512_1_0 = 33, R_512_1_1 = 27, R_512_1_2 = 14, R_512_1_3 = 42,
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R_512_2_0 = 17, R_512_2_1 = 49, R_512_2_2 = 36, R_512_2_3 = 39,
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R_512_3_0 = 44, R_512_3_1 = 9, R_512_3_2 = 54, R_512_3_3 = 56,
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R_512_4_0 = 39, R_512_4_1 = 30, R_512_4_2 = 34, R_512_4_3 = 24,
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R_512_5_0 = 13, R_512_5_1 = 50, R_512_5_2 = 10, R_512_5_3 = 17,
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R_512_6_0 = 25, R_512_6_1 = 29, R_512_6_2 = 39, R_512_6_3 = 43,
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R_512_7_0 = 8, R_512_7_1 = 35, R_512_7_2 = 56, R_512_7_3 = 22,
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/* Skein1024 round rotation constants */
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R1024_0_0 = 24, R1024_0_1 = 13, R1024_0_2 = 8, R1024_0_3 =
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47, R1024_0_4 = 8, R1024_0_5 = 17, R1024_0_6 = 22, R1024_0_7 = 37,
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R1024_1_0 = 38, R1024_1_1 = 19, R1024_1_2 = 10, R1024_1_3 =
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55, R1024_1_4 = 49, R1024_1_5 = 18, R1024_1_6 = 23, R1024_1_7 = 52,
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R1024_2_0 = 33, R1024_2_1 = 4, R1024_2_2 = 51, R1024_2_3 =
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13, R1024_2_4 = 34, R1024_2_5 = 41, R1024_2_6 = 59, R1024_2_7 = 17,
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R1024_3_0 = 5, R1024_3_1 = 20, R1024_3_2 = 48, R1024_3_3 =
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41, R1024_3_4 = 47, R1024_3_5 = 28, R1024_3_6 = 16, R1024_3_7 = 25,
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R1024_4_0 = 41, R1024_4_1 = 9, R1024_4_2 = 37, R1024_4_3 =
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31, R1024_4_4 = 12, R1024_4_5 = 47, R1024_4_6 = 44, R1024_4_7 = 30,
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R1024_5_0 = 16, R1024_5_1 = 34, R1024_5_2 = 56, R1024_5_3 =
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51, R1024_5_4 = 4, R1024_5_5 = 53, R1024_5_6 = 42, R1024_5_7 = 41,
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R1024_6_0 = 31, R1024_6_1 = 44, R1024_6_2 = 47, R1024_6_3 =
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46, R1024_6_4 = 19, R1024_6_5 = 42, R1024_6_6 = 44, R1024_6_7 = 25,
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R1024_7_0 = 9, R1024_7_1 = 48, R1024_7_2 = 35, R1024_7_3 =
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52, R1024_7_4 = 23, R1024_7_5 = 31, R1024_7_6 = 37, R1024_7_7 = 20
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};
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/* number of rounds for the different block sizes */
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#define SKEIN_256_ROUNDS_TOTAL (72)
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#define SKEIN_512_ROUNDS_TOTAL (72)
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#define SKEIN1024_ROUNDS_TOTAL (80)
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extern const uint64_t SKEIN_256_IV_128[];
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extern const uint64_t SKEIN_256_IV_160[];
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extern const uint64_t SKEIN_256_IV_224[];
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extern const uint64_t SKEIN_256_IV_256[];
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extern const uint64_t SKEIN_512_IV_128[];
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extern const uint64_t SKEIN_512_IV_160[];
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extern const uint64_t SKEIN_512_IV_224[];
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extern const uint64_t SKEIN_512_IV_256[];
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extern const uint64_t SKEIN_512_IV_384[];
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extern const uint64_t SKEIN_512_IV_512[];
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extern const uint64_t SKEIN1024_IV_384[];
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extern const uint64_t SKEIN1024_IV_512[];
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extern const uint64_t SKEIN1024_IV_1024[];
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/* Functions to process blkCnt (nonzero) full block(s) of data. */
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void Skein_256_Process_Block(Skein_256_Ctxt_t *ctx, const uint8_t *blkPtr,
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size_t blkCnt, size_t byteCntAdd);
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void Skein_512_Process_Block(Skein_512_Ctxt_t *ctx, const uint8_t *blkPtr,
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size_t blkCnt, size_t byteCntAdd);
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void Skein1024_Process_Block(Skein1024_Ctxt_t *ctx, const uint8_t *blkPtr,
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size_t blkCnt, size_t byteCntAdd);
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#endif /* _SKEIN_IMPL_H_ */
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