#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_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 ** ***************************************************************************/ /*Skein digest sizes for crypto api*/ #define SKEIN256_DIGEST_BIT_SIZE 256 #define SKEIN512_DIGEST_BIT_SIZE 512 #define SKEIN1024_DIGEST_BIT_SIZE 1024 /* below two prototype assume we are handed aligned data */ #define skein_put64_lsb_first(dst08, src64, b_cnt) memcpy(dst08, src64, b_cnt) #define skein_get64_lsb_first(dst64, src08, w_cnt) \ memcpy(dst64, src08, 8*(w_cnt)) #define skein_swap64(w64) (w64) 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 SKEIN_1024_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 SKEIN_1024_STATE_BYTES (8*SKEIN_1024_STATE_WORDS) #define SKEIN_256_STATE_BITS (64*SKEIN_256_STATE_WORDS) #define SKEIN_512_STATE_BITS (64*SKEIN_512_STATE_WORDS) #define SKEIN_1024_STATE_BITS (64*SKEIN_1024_STATE_WORDS) #define SKEIN_256_BLOCK_BYTES (8*SKEIN_256_STATE_WORDS) #define SKEIN_512_BLOCK_BYTES (8*SKEIN_512_STATE_WORDS) #define SKEIN_1024_BLOCK_BYTES (8*SKEIN_1024_STATE_WORDS) struct skein_ctx_hdr { size_t hash_bit_len; /* size of hash result, in bits */ size_t b_cnt; /* current byte count in buffer b[] */ u64 tweak[SKEIN_MODIFIER_WORDS]; /* tweak[0]=byte cnt, tweak[1]=flags */ }; struct skein_256_ctx { /* 256-bit Skein hash context structure */ struct skein_ctx_hdr h; /* common header context variables */ u64 x[SKEIN_256_STATE_WORDS]; /* chaining variables */ u8 b[SKEIN_256_BLOCK_BYTES]; /* partial block buf (8-byte aligned) */ }; struct skein_512_ctx { /* 512-bit Skein hash context structure */ struct skein_ctx_hdr h; /* common header context variables */ u64 x[SKEIN_512_STATE_WORDS]; /* chaining variables */ u8 b[SKEIN_512_BLOCK_BYTES]; /* partial block buf (8-byte aligned) */ }; struct skein_1024_ctx { /* 1024-bit Skein hash context structure */ struct skein_ctx_hdr h; /* common header context variables */ u64 x[SKEIN_1024_STATE_WORDS]; /* chaining variables */ u8 b[SKEIN_1024_BLOCK_BYTES]; /* partial block buf (8-byte aligned) */ }; static inline u64 rotl_64(u64 x, u8 N) { return (x << N) | (x >> (64 - N)); } /* Skein APIs for (incremental) "straight hashing" */ int skein_256_init(struct skein_256_ctx *ctx, size_t hash_bit_len); int skein_512_init(struct skein_512_ctx *ctx, size_t hash_bit_len); int skein_1024_init(struct skein_1024_ctx *ctx, size_t hash_bit_len); int skein_256_update(struct skein_256_ctx *ctx, const u8 *msg, size_t msg_byte_cnt); int skein_512_update(struct skein_512_ctx *ctx, const u8 *msg, size_t msg_byte_cnt); int skein_1024_update(struct skein_1024_ctx *ctx, const u8 *msg, size_t msg_byte_cnt); int skein_256_final(struct skein_256_ctx *ctx, u8 *hash_val); int skein_512_final(struct skein_512_ctx *ctx, u8 *hash_val); int skein_1024_final(struct skein_1024_ctx *ctx, u8 *hash_val); /* ** Skein APIs for "extended" initialization: MAC keys, tree hashing. ** After an init_ext() call, just use update/final calls as with init(). ** ** Notes: Same parameters as _init() calls, plus tree_info/key/key_bytes. ** When key_bytes == 0 and tree_info == SKEIN_SEQUENTIAL, ** the results of init_ext() are identical to calling init(). ** The function init() may be called once to "precompute" the IV for ** a given hash_bit_len value, then by saving a copy of the context ** the IV computation may be avoided in later calls. ** Similarly, the function init_ext() 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_init_ext(struct skein_256_ctx *ctx, size_t hash_bit_len, u64 tree_info, const u8 *key, size_t key_bytes); int skein_512_init_ext(struct skein_512_ctx *ctx, size_t hash_bit_len, u64 tree_info, const u8 *key, size_t key_bytes); int skein_1024_init_ext(struct skein_1024_ctx *ctx, size_t hash_bit_len, u64 tree_info, const u8 *key, size_t key_bytes); /* ** 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(struct skein_256_ctx *ctx, u8 *hash_val); int skein_512_final_pad(struct skein_512_ctx *ctx, u8 *hash_val); int skein_1024_final_pad(struct skein_1024_ctx *ctx, u8 *hash_val); #ifndef SKEIN_TREE_HASH #define SKEIN_TREE_HASH (1) #endif #if SKEIN_TREE_HASH int skein_256_output(struct skein_256_ctx *ctx, u8 *hash_val); int skein_512_output(struct skein_512_ctx *ctx, u8 *hash_val); int skein_1024_output(struct skein_1024_ctx *ctx, u8 *hash_val); #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 tweak[1]: bit field starting positions */ #define SKEIN_T1_BIT(BIT) ((BIT) - 64) /* second word */ #define SKEIN_T1_POS_TREE_LVL SKEIN_T1_BIT(112) /* 112..118 hash tree level */ #define SKEIN_T1_POS_BIT_PAD SKEIN_T1_BIT(119) /* 119 part. final in byte */ #define SKEIN_T1_POS_BLK_TYPE SKEIN_T1_BIT(120) /* 120..125 type field `*/ #define SKEIN_T1_POS_FIRST SKEIN_T1_BIT(126) /* 126 first blk flag */ #define SKEIN_T1_POS_FINAL SKEIN_T1_BIT(127) /* 127 final blk flag */ /* tweak word tweak[1]: flag bit definition(s) */ #define SKEIN_T1_FLAG_FIRST (((u64) 1) << SKEIN_T1_POS_FIRST) #define SKEIN_T1_FLAG_FINAL (((u64) 1) << SKEIN_T1_POS_FINAL) #define SKEIN_T1_FLAG_BIT_PAD (((u64) 1) << SKEIN_T1_POS_BIT_PAD) /* tweak word tweak[1]: tree level bit field mask */ #define SKEIN_T1_TREE_LVL_MASK (((u64)0x7F) << SKEIN_T1_POS_TREE_LVL) #define SKEIN_T1_TREE_LEVEL(n) (((u64) (n)) << SKEIN_T1_POS_TREE_LVL) /* tweak word tweak[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) /* pubkey (for digital sigs) */ #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) (((u64) (SKEIN_BLK_TYPE_##T)) << \ SKEIN_T1_POS_BLK_TYPE) #define SKEIN_T1_BLK_TYPE_KEY SKEIN_T1_BLK_TYPE(KEY) /* for MAC and KDF */ #define SKEIN_T1_BLK_TYPE_CFG SKEIN_T1_BLK_TYPE(CFG) /* config block */ #define SKEIN_T1_BLK_TYPE_PERS SKEIN_T1_BLK_TYPE(PERS) /* personalization */ #define SKEIN_T1_BLK_TYPE_PK SKEIN_T1_BLK_TYPE(PK) /* pubkey (for sigs) */ #define SKEIN_T1_BLK_TYPE_KDF SKEIN_T1_BLK_TYPE(KDF) /* key ident 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) + (((u64) (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 tree_info 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 (((u64)0xFF) << \ SKEIN_CFG_TREE_LEAF_SIZE_POS) #define SKEIN_CFG_TREE_NODE_SIZE_MSK (((u64)0xFF) << \ SKEIN_CFG_TREE_NODE_SIZE_POS) #define SKEIN_CFG_TREE_MAX_LEVEL_MSK (((u64)0xFF) << \ SKEIN_CFG_TREE_MAX_LEVEL_POS) #define SKEIN_CFG_TREE_INFO(leaf, node, max_lvl) \ ((((u64)(leaf)) << SKEIN_CFG_TREE_LEAF_SIZE_POS) | \ (((u64)(node)) << SKEIN_CFG_TREE_NODE_SIZE_POS) | \ (((u64)(max_lvl)) << SKEIN_CFG_TREE_MAX_LEVEL_POS)) /* use as tree_info 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(ctx_ptr, TWK_NUM) ((ctx_ptr)->h.tweak[TWK_NUM]) #define skein_set_tweak(ctx_ptr, TWK_NUM, t_val) { \ (ctx_ptr)->h.tweak[TWK_NUM] = (t_val); \ } #define skein_get_T0(ctx_ptr) skein_get_tweak(ctx_ptr, 0) #define skein_get_T1(ctx_ptr) skein_get_tweak(ctx_ptr, 1) #define skein_set_T0(ctx_ptr, T0) skein_set_tweak(ctx_ptr, 0, T0) #define skein_set_T1(ctx_ptr, T1) skein_set_tweak(ctx_ptr, 1, T1) /* set both tweak words at once */ #define skein_set_T0_T1(ctx_ptr, T0, T1) \ { \ skein_set_T0(ctx_ptr, (T0)); \ skein_set_T1(ctx_ptr, (T1)); \ } #define skein_set_type(ctx_ptr, BLK_TYPE) \ skein_set_T1(ctx_ptr, SKEIN_T1_BLK_TYPE_##BLK_TYPE) /* * setup for starting with a new type: * h.tweak[0]=0; h.tweak[1] = NEW_TYPE; h.b_cnt=0; */ #define skein_start_new_type(ctx_ptr, BLK_TYPE) { \ skein_set_T0_T1(ctx_ptr, 0, SKEIN_T1_FLAG_FIRST | \ SKEIN_T1_BLK_TYPE_##BLK_TYPE); \ (ctx_ptr)->h.b_cnt = 0; \ } #define skein_clear_first_flag(hdr) { \ (hdr).tweak[1] &= ~SKEIN_T1_FLAG_FIRST; \ } #define skein_set_bit_pad_flag(hdr) { \ (hdr).tweak[1] |= SKEIN_T1_FLAG_BIT_PAD; \ } #define skein_set_tree_level(hdr, height) { \ (hdr).tweak[1] |= SKEIN_T1_TREE_LEVEL(height); \ } /* ignore all asserts, for performance */ #define skein_assert_ret(x, ret_code) #define skein_assert(x) /***************************************************************** ** 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, /* SKEIN_1024 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) /* # rounds for diff block sizes */ #define SKEIN_512_ROUNDS_TOTAL (72) #define SKEIN_1024_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 SKEIN_1024_ROUNDS_TOTAL (8*((((SKEIN_ROUNDS) + 5) % 10) + 5)) #endif #endif /* ifndef _SKEIN_H_ */