123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341342343344345346347348349350351352353354355356357358359360361362363364365366367368369370371372373374375376377378379380381382383384385386387388389390391392393394395396397398399400401402403404405406407408409410411412413414415416417418419420421422423424425426427428429430431432433434435436437438439440441442443444445446447448449450451452453454455456457458459460461462463464465466467468469470471472473474475476477478479480481482483484485486487488489490491492493494495496497498499500501502503504505506507508509510511512513514515516517518519520521522523524525526527528529530531532533534535536537538539540541542543544545546547548549550551552553554555556557558559560561562563564565566567568569570571572573574575576577578579580581582583584585586587588589590591592593594595596597598599600601602603604605606607608609610611612613614615616617618619620621622623624625626627628629630631632633634635636637638639640641642643644645646647648649650651652653654655656657658659660661662663664665666667668669670671672673674675676677678679680681682683684685686687688689690691692693694695696697698699700701702703704705706707708709710711712713714715716717718719720721722723724725726727728729730731732733734735736737738739740741742743744745746747748749750751752753754755756757758759760761762763764765766767768769770771772773774775776777778779780781782 |
- /***********************************************************************
- **
- ** Implementation of the Skein block functions.
- **
- ** Source code author: Doug Whiting, 2008.
- **
- ** This algorithm and source code is released to the public domain.
- **
- ** Compile-time switches:
- **
- ** SKEIN_USE_ASM -- set bits (256/512/1024) to select which
- ** versions use ASM code for block processing
- ** [default: use C for all block sizes]
- **
- ************************************************************************/
- #include <linux/string.h>
- #include "skein_base.h"
- #include "skein_block.h"
- #ifndef SKEIN_USE_ASM
- #define SKEIN_USE_ASM (0) /* default is all C code (no ASM) */
- #endif
- #ifndef SKEIN_LOOP
- #define SKEIN_LOOP 001 /* default: unroll 256 and 512, but not 1024 */
- #endif
- #define BLK_BITS (WCNT * 64) /* some useful definitions for code here */
- #define KW_TWK_BASE (0)
- #define KW_KEY_BASE (3)
- #define ks (kw + KW_KEY_BASE)
- #define ts (kw + KW_TWK_BASE)
- #ifdef SKEIN_DEBUG
- #define debug_save_tweak(ctx) \
- { \
- ctx->h.tweak[0] = ts[0]; \
- ctx->h.tweak[1] = ts[1]; \
- }
- #else
- #define debug_save_tweak(ctx)
- #endif
- #if !(SKEIN_USE_ASM & 256)
- #undef RCNT
- #define RCNT (SKEIN_256_ROUNDS_TOTAL / 8)
- #ifdef SKEIN_LOOP /* configure how much to unroll the loop */
- #define SKEIN_UNROLL_256 (((SKEIN_LOOP) / 100) % 10)
- #else
- #define SKEIN_UNROLL_256 (0)
- #endif
- #if SKEIN_UNROLL_256
- #if (RCNT % SKEIN_UNROLL_256)
- #error "Invalid SKEIN_UNROLL_256" /* sanity check on unroll count */
- #endif
- #endif
- #define ROUND256(p0, p1, p2, p3, ROT, r_num) \
- do { \
- X##p0 += X##p1; \
- X##p1 = rotl_64(X##p1, ROT##_0); \
- X##p1 ^= X##p0; \
- X##p2 += X##p3; \
- X##p3 = rotl_64(X##p3, ROT##_1); \
- X##p3 ^= X##p2; \
- } while (0)
- #if SKEIN_UNROLL_256 == 0
- #define R256(p0, p1, p2, p3, ROT, r_num) /* fully unrolled */ \
- ROUND256(p0, p1, p2, p3, ROT, r_num)
- #define I256(R) \
- do { \
- /* inject the key schedule value */ \
- X0 += ks[((R) + 1) % 5]; \
- X1 += ks[((R) + 2) % 5] + ts[((R) + 1) % 3]; \
- X2 += ks[((R) + 3) % 5] + ts[((R) + 2) % 3]; \
- X3 += ks[((R) + 4) % 5] + (R) + 1; \
- } while (0)
- #else
- /* looping version */
- #define R256(p0, p1, p2, p3, ROT, r_num) ROUND256(p0, p1, p2, p3, ROT, r_num)
- #define I256(R) \
- do { \
- /* inject the key schedule value */ \
- X0 += ks[r + (R) + 0]; \
- X1 += ks[r + (R) + 1] + ts[r + (R) + 0];\
- X2 += ks[r + (R) + 2] + ts[r + (R) + 1];\
- X3 += ks[r + (R) + 3] + r + (R); \
- /* rotate key schedule */ \
- ks[r + (R) + 4] = ks[r + (R) - 1]; \
- ts[r + (R) + 2] = ts[r + (R) - 1]; \
- } while (0)
- #endif
- #define R256_8_ROUNDS(R) \
- do { \
- R256(0, 1, 2, 3, R_256_0, 8 * (R) + 1); \
- R256(0, 3, 2, 1, R_256_1, 8 * (R) + 2); \
- R256(0, 1, 2, 3, R_256_2, 8 * (R) + 3); \
- R256(0, 3, 2, 1, R_256_3, 8 * (R) + 4); \
- I256(2 * (R)); \
- R256(0, 1, 2, 3, R_256_4, 8 * (R) + 5); \
- R256(0, 3, 2, 1, R_256_5, 8 * (R) + 6); \
- R256(0, 1, 2, 3, R_256_6, 8 * (R) + 7); \
- R256(0, 3, 2, 1, R_256_7, 8 * (R) + 8); \
- I256(2 * (R) + 1); \
- } while (0)
- #define R256_UNROLL_R(NN) \
- ((SKEIN_UNROLL_256 == 0 && \
- SKEIN_256_ROUNDS_TOTAL / 8 > (NN)) || \
- (SKEIN_UNROLL_256 > (NN)))
- #if (SKEIN_UNROLL_256 > 14)
- #error "need more unrolling in skein_256_process_block"
- #endif
- #endif
- #if !(SKEIN_USE_ASM & 512)
- #undef RCNT
- #define RCNT (SKEIN_512_ROUNDS_TOTAL/8)
- #ifdef SKEIN_LOOP /* configure how much to unroll the loop */
- #define SKEIN_UNROLL_512 (((SKEIN_LOOP)/10)%10)
- #else
- #define SKEIN_UNROLL_512 (0)
- #endif
- #if SKEIN_UNROLL_512
- #if (RCNT % SKEIN_UNROLL_512)
- #error "Invalid SKEIN_UNROLL_512" /* sanity check on unroll count */
- #endif
- #endif
- #define ROUND512(p0, p1, p2, p3, p4, p5, p6, p7, ROT, r_num) \
- do { \
- X##p0 += X##p1; \
- X##p1 = rotl_64(X##p1, ROT##_0); \
- X##p1 ^= X##p0; \
- X##p2 += X##p3; \
- X##p3 = rotl_64(X##p3, ROT##_1); \
- X##p3 ^= X##p2; \
- X##p4 += X##p5; \
- X##p5 = rotl_64(X##p5, ROT##_2); \
- X##p5 ^= X##p4; \
- X##p6 += X##p7; X##p7 = rotl_64(X##p7, ROT##_3);\
- X##p7 ^= X##p6; \
- } while (0)
- #if SKEIN_UNROLL_512 == 0
- #define R512(p0, p1, p2, p3, p4, p5, p6, p7, ROT, r_num) /* unrolled */ \
- ROUND512(p0, p1, p2, p3, p4, p5, p6, p7, ROT, r_num)
- #define I512(R) \
- do { \
- /* inject the key schedule value */ \
- X0 += ks[((R) + 1) % 9]; \
- X1 += ks[((R) + 2) % 9]; \
- X2 += ks[((R) + 3) % 9]; \
- X3 += ks[((R) + 4) % 9]; \
- X4 += ks[((R) + 5) % 9]; \
- X5 += ks[((R) + 6) % 9] + ts[((R) + 1) % 3]; \
- X6 += ks[((R) + 7) % 9] + ts[((R) + 2) % 3]; \
- X7 += ks[((R) + 8) % 9] + (R) + 1; \
- } while (0)
- #else /* looping version */
- #define R512(p0, p1, p2, p3, p4, p5, p6, p7, ROT, r_num) \
- ROUND512(p0, p1, p2, p3, p4, p5, p6, p7, ROT, r_num) \
- #define I512(R) \
- do { \
- /* inject the key schedule value */ \
- X0 += ks[r + (R) + 0]; \
- X1 += ks[r + (R) + 1]; \
- X2 += ks[r + (R) + 2]; \
- X3 += ks[r + (R) + 3]; \
- X4 += ks[r + (R) + 4]; \
- X5 += ks[r + (R) + 5] + ts[r + (R) + 0]; \
- X6 += ks[r + (R) + 6] + ts[r + (R) + 1]; \
- X7 += ks[r + (R) + 7] + r + (R); \
- /* rotate key schedule */ \
- ks[r + (R) + 8] = ks[r + (R) - 1]; \
- ts[r + (R) + 2] = ts[r + (R) - 1]; \
- } while (0)
- #endif /* end of looped code definitions */
- #define R512_8_ROUNDS(R) /* do 8 full rounds */ \
- do { \
- R512(0, 1, 2, 3, 4, 5, 6, 7, R_512_0, 8 * (R) + 1); \
- R512(2, 1, 4, 7, 6, 5, 0, 3, R_512_1, 8 * (R) + 2); \
- R512(4, 1, 6, 3, 0, 5, 2, 7, R_512_2, 8 * (R) + 3); \
- R512(6, 1, 0, 7, 2, 5, 4, 3, R_512_3, 8 * (R) + 4); \
- I512(2 * (R)); \
- R512(0, 1, 2, 3, 4, 5, 6, 7, R_512_4, 8 * (R) + 5); \
- R512(2, 1, 4, 7, 6, 5, 0, 3, R_512_5, 8 * (R) + 6); \
- R512(4, 1, 6, 3, 0, 5, 2, 7, R_512_6, 8 * (R) + 7); \
- R512(6, 1, 0, 7, 2, 5, 4, 3, R_512_7, 8 * (R) + 8); \
- I512(2 * (R) + 1); /* and key injection */ \
- } while (0)
- #define R512_UNROLL_R(NN) \
- ((SKEIN_UNROLL_512 == 0 && \
- SKEIN_512_ROUNDS_TOTAL/8 > (NN)) || \
- (SKEIN_UNROLL_512 > (NN)))
- #if (SKEIN_UNROLL_512 > 14)
- #error "need more unrolling in skein_512_process_block"
- #endif
- #endif
- #if !(SKEIN_USE_ASM & 1024)
- #undef RCNT
- #define RCNT (SKEIN_1024_ROUNDS_TOTAL/8)
- #ifdef SKEIN_LOOP /* configure how much to unroll the loop */
- #define SKEIN_UNROLL_1024 ((SKEIN_LOOP) % 10)
- #else
- #define SKEIN_UNROLL_1024 (0)
- #endif
- #if (SKEIN_UNROLL_1024 != 0)
- #if (RCNT % SKEIN_UNROLL_1024)
- #error "Invalid SKEIN_UNROLL_1024" /* sanity check on unroll count */
- #endif
- #endif
- #define ROUND1024(p0, p1, p2, p3, p4, p5, p6, p7, p8, p9, pA, pB, pC, pD, pE, \
- pF, ROT, r_num) \
- do { \
- X##p0 += X##p1; \
- X##p1 = rotl_64(X##p1, ROT##_0); \
- X##p1 ^= X##p0; \
- X##p2 += X##p3; \
- X##p3 = rotl_64(X##p3, ROT##_1); \
- X##p3 ^= X##p2; \
- X##p4 += X##p5; \
- X##p5 = rotl_64(X##p5, ROT##_2); \
- X##p5 ^= X##p4; \
- X##p6 += X##p7; \
- X##p7 = rotl_64(X##p7, ROT##_3); \
- X##p7 ^= X##p6; \
- X##p8 += X##p9; \
- X##p9 = rotl_64(X##p9, ROT##_4); \
- X##p9 ^= X##p8; \
- X##pA += X##pB; \
- X##pB = rotl_64(X##pB, ROT##_5); \
- X##pB ^= X##pA; \
- X##pC += X##pD; \
- X##pD = rotl_64(X##pD, ROT##_6); \
- X##pD ^= X##pC; \
- X##pE += X##pF; \
- X##pF = rotl_64(X##pF, ROT##_7); \
- X##pF ^= X##pE; \
- } while (0)
- #if SKEIN_UNROLL_1024 == 0
- #define R1024(p0, p1, p2, p3, p4, p5, p6, p7, p8, p9, pA, pB, pC, pD, pE, pF, \
- ROT, rn) \
- ROUND1024(p0, p1, p2, p3, p4, p5, p6, p7, p8, p9, pA, pB, pC, pD, pE, \
- pF, ROT, rn) \
- #define I1024(R) \
- do { \
- /* inject the key schedule value */ \
- X00 += ks[((R) + 1) % 17]; \
- X01 += ks[((R) + 2) % 17]; \
- X02 += ks[((R) + 3) % 17]; \
- X03 += ks[((R) + 4) % 17]; \
- X04 += ks[((R) + 5) % 17]; \
- X05 += ks[((R) + 6) % 17]; \
- X06 += ks[((R) + 7) % 17]; \
- X07 += ks[((R) + 8) % 17]; \
- X08 += ks[((R) + 9) % 17]; \
- X09 += ks[((R) + 10) % 17]; \
- X10 += ks[((R) + 11) % 17]; \
- X11 += ks[((R) + 12) % 17]; \
- X12 += ks[((R) + 13) % 17]; \
- X13 += ks[((R) + 14) % 17] + ts[((R) + 1) % 3]; \
- X14 += ks[((R) + 15) % 17] + ts[((R) + 2) % 3]; \
- X15 += ks[((R) + 16) % 17] + (R) + 1; \
- } while (0)
- #else /* looping version */
- #define R1024(p0, p1, p2, p3, p4, p5, p6, p7, p8, p9, pA, pB, pC, pD, pE, pF, \
- ROT, rn) \
- ROUND1024(p0, p1, p2, p3, p4, p5, p6, p7, p8, p9, pA, pB, pC, pD, pE, \
- pF, ROT, rn) \
- #define I1024(R) \
- do { \
- /* inject the key schedule value */ \
- X00 += ks[r + (R) + 0]; \
- X01 += ks[r + (R) + 1]; \
- X02 += ks[r + (R) + 2]; \
- X03 += ks[r + (R) + 3]; \
- X04 += ks[r + (R) + 4]; \
- X05 += ks[r + (R) + 5]; \
- X06 += ks[r + (R) + 6]; \
- X07 += ks[r + (R) + 7]; \
- X08 += ks[r + (R) + 8]; \
- X09 += ks[r + (R) + 9]; \
- X10 += ks[r + (R) + 10]; \
- X11 += ks[r + (R) + 11]; \
- X12 += ks[r + (R) + 12]; \
- X13 += ks[r + (R) + 13] + ts[r + (R) + 0]; \
- X14 += ks[r + (R) + 14] + ts[r + (R) + 1]; \
- X15 += ks[r + (R) + 15] + r + (R); \
- /* rotate key schedule */ \
- ks[r + (R) + 16] = ks[r + (R) - 1]; \
- ts[r + (R) + 2] = ts[r + (R) - 1]; \
- } while (0)
- #endif
- #define R1024_8_ROUNDS(R) \
- do { \
- R1024(00, 01, 02, 03, 04, 05, 06, 07, 08, 09, 10, 11, 12, \
- 13, 14, 15, R1024_0, 8*(R) + 1); \
- R1024(00, 09, 02, 13, 06, 11, 04, 15, 10, 07, 12, 03, 14, \
- 05, 08, 01, R1024_1, 8*(R) + 2); \
- R1024(00, 07, 02, 05, 04, 03, 06, 01, 12, 15, 14, 13, 08, \
- 11, 10, 09, R1024_2, 8*(R) + 3); \
- R1024(00, 15, 02, 11, 06, 13, 04, 09, 14, 01, 08, 05, 10, \
- 03, 12, 07, R1024_3, 8*(R) + 4); \
- I1024(2*(R)); \
- R1024(00, 01, 02, 03, 04, 05, 06, 07, 08, 09, 10, 11, 12, \
- 13, 14, 15, R1024_4, 8*(R) + 5); \
- R1024(00, 09, 02, 13, 06, 11, 04, 15, 10, 07, 12, 03, 14, \
- 05, 08, 01, R1024_5, 8*(R) + 6); \
- R1024(00, 07, 02, 05, 04, 03, 06, 01, 12, 15, 14, 13, 08, \
- 11, 10, 09, R1024_6, 8*(R) + 7); \
- R1024(00, 15, 02, 11, 06, 13, 04, 09, 14, 01, 08, 05, 10, \
- 03, 12, 07, R1024_7, 8*(R) + 8); \
- I1024(2*(R)+1); \
- } while (0)
- #define R1024_UNROLL_R(NN) \
- ((SKEIN_UNROLL_1024 == 0 && \
- SKEIN_1024_ROUNDS_TOTAL/8 > (NN)) || \
- (SKEIN_UNROLL_1024 > (NN)))
- #if (SKEIN_UNROLL_1024 > 14)
- #error "need more unrolling in Skein_1024_Process_Block"
- #endif
- #endif
- /***************************** SKEIN_256 ******************************/
- #if !(SKEIN_USE_ASM & 256)
- void skein_256_process_block(struct skein_256_ctx *ctx, const u8 *blk_ptr,
- size_t blk_cnt, size_t byte_cnt_add)
- { /* do it in C */
- enum {
- WCNT = SKEIN_256_STATE_WORDS
- };
- size_t r;
- #if SKEIN_UNROLL_256
- /* key schedule: chaining vars + tweak + "rot"*/
- u64 kw[WCNT+4+RCNT*2];
- #else
- /* key schedule words : chaining vars + tweak */
- u64 kw[WCNT+4];
- #endif
- u64 X0, X1, X2, X3; /* local copy of context vars, for speed */
- u64 w[WCNT]; /* local copy of input block */
- #ifdef SKEIN_DEBUG
- const u64 *X_ptr[4]; /* use for debugging (help cc put Xn in regs) */
- X_ptr[0] = &X0;
- X_ptr[1] = &X1;
- X_ptr[2] = &X2;
- X_ptr[3] = &X3;
- #endif
- skein_assert(blk_cnt != 0); /* never call with blk_cnt == 0! */
- ts[0] = ctx->h.tweak[0];
- ts[1] = ctx->h.tweak[1];
- do {
- /*
- * this implementation only supports 2**64 input bytes
- * (no carry out here)
- */
- ts[0] += byte_cnt_add; /* update processed length */
- /* precompute the key schedule for this block */
- ks[0] = ctx->x[0];
- ks[1] = ctx->x[1];
- ks[2] = ctx->x[2];
- ks[3] = ctx->x[3];
- ks[4] = ks[0] ^ ks[1] ^ ks[2] ^ ks[3] ^ SKEIN_KS_PARITY;
- ts[2] = ts[0] ^ ts[1];
- /* get input block in little-endian format */
- skein_get64_lsb_first(w, blk_ptr, WCNT);
- debug_save_tweak(ctx);
- /* do the first full key injection */
- X0 = w[0] + ks[0];
- X1 = w[1] + ks[1] + ts[0];
- X2 = w[2] + ks[2] + ts[1];
- X3 = w[3] + ks[3];
- blk_ptr += SKEIN_256_BLOCK_BYTES;
- /* run the rounds */
- for (r = 1;
- r < (SKEIN_UNROLL_256 ? 2 * RCNT : 2);
- r += (SKEIN_UNROLL_256 ? 2 * SKEIN_UNROLL_256 : 1)) {
- R256_8_ROUNDS(0);
- #if R256_UNROLL_R(1)
- R256_8_ROUNDS(1);
- #endif
- #if R256_UNROLL_R(2)
- R256_8_ROUNDS(2);
- #endif
- #if R256_UNROLL_R(3)
- R256_8_ROUNDS(3);
- #endif
- #if R256_UNROLL_R(4)
- R256_8_ROUNDS(4);
- #endif
- #if R256_UNROLL_R(5)
- R256_8_ROUNDS(5);
- #endif
- #if R256_UNROLL_R(6)
- R256_8_ROUNDS(6);
- #endif
- #if R256_UNROLL_R(7)
- R256_8_ROUNDS(7);
- #endif
- #if R256_UNROLL_R(8)
- R256_8_ROUNDS(8);
- #endif
- #if R256_UNROLL_R(9)
- R256_8_ROUNDS(9);
- #endif
- #if R256_UNROLL_R(10)
- R256_8_ROUNDS(10);
- #endif
- #if R256_UNROLL_R(11)
- R256_8_ROUNDS(11);
- #endif
- #if R256_UNROLL_R(12)
- R256_8_ROUNDS(12);
- #endif
- #if R256_UNROLL_R(13)
- R256_8_ROUNDS(13);
- #endif
- #if R256_UNROLL_R(14)
- R256_8_ROUNDS(14);
- #endif
- }
- /* do the final "feedforward" xor, update context chaining */
- ctx->x[0] = X0 ^ w[0];
- ctx->x[1] = X1 ^ w[1];
- ctx->x[2] = X2 ^ w[2];
- ctx->x[3] = X3 ^ w[3];
- ts[1] &= ~SKEIN_T1_FLAG_FIRST;
- } while (--blk_cnt);
- ctx->h.tweak[0] = ts[0];
- ctx->h.tweak[1] = ts[1];
- }
- #if defined(SKEIN_CODE_SIZE) || defined(SKEIN_PERF)
- size_t skein_256_process_block_code_size(void)
- {
- return ((u8 *) skein_256_process_block_code_size) -
- ((u8 *) skein_256_process_block);
- }
- unsigned int skein_256_unroll_cnt(void)
- {
- return SKEIN_UNROLL_256;
- }
- #endif
- #endif
- /***************************** SKEIN_512 ******************************/
- #if !(SKEIN_USE_ASM & 512)
- void skein_512_process_block(struct skein_512_ctx *ctx, const u8 *blk_ptr,
- size_t blk_cnt, size_t byte_cnt_add)
- { /* do it in C */
- enum {
- WCNT = SKEIN_512_STATE_WORDS
- };
- size_t r;
- #if SKEIN_UNROLL_512
- u64 kw[WCNT+4+RCNT*2]; /* key sched: chaining vars + tweak + "rot"*/
- #else
- u64 kw[WCNT+4]; /* key schedule words : chaining vars + tweak */
- #endif
- u64 X0, X1, X2, X3, X4, X5, X6, X7; /* local copies, for speed */
- u64 w[WCNT]; /* local copy of input block */
- #ifdef SKEIN_DEBUG
- const u64 *X_ptr[8]; /* use for debugging (help cc put Xn in regs) */
- X_ptr[0] = &X0;
- X_ptr[1] = &X1;
- X_ptr[2] = &X2;
- X_ptr[3] = &X3;
- X_ptr[4] = &X4;
- X_ptr[5] = &X5;
- X_ptr[6] = &X6;
- X_ptr[7] = &X7;
- #endif
- skein_assert(blk_cnt != 0); /* never call with blk_cnt == 0! */
- ts[0] = ctx->h.tweak[0];
- ts[1] = ctx->h.tweak[1];
- do {
- /*
- * this implementation only supports 2**64 input bytes
- * (no carry out here)
- */
- ts[0] += byte_cnt_add; /* update processed length */
- /* precompute the key schedule for this block */
- ks[0] = ctx->x[0];
- ks[1] = ctx->x[1];
- ks[2] = ctx->x[2];
- ks[3] = ctx->x[3];
- ks[4] = ctx->x[4];
- ks[5] = ctx->x[5];
- ks[6] = ctx->x[6];
- ks[7] = ctx->x[7];
- ks[8] = ks[0] ^ ks[1] ^ ks[2] ^ ks[3] ^
- ks[4] ^ ks[5] ^ ks[6] ^ ks[7] ^ SKEIN_KS_PARITY;
- ts[2] = ts[0] ^ ts[1];
- /* get input block in little-endian format */
- skein_get64_lsb_first(w, blk_ptr, WCNT);
- debug_save_tweak(ctx);
- /* do the first full key injection */
- X0 = w[0] + ks[0];
- X1 = w[1] + ks[1];
- X2 = w[2] + ks[2];
- X3 = w[3] + ks[3];
- X4 = w[4] + ks[4];
- X5 = w[5] + ks[5] + ts[0];
- X6 = w[6] + ks[6] + ts[1];
- X7 = w[7] + ks[7];
- blk_ptr += SKEIN_512_BLOCK_BYTES;
- /* run the rounds */
- for (r = 1;
- r < (SKEIN_UNROLL_512 ? 2 * RCNT : 2);
- r += (SKEIN_UNROLL_512 ? 2 * SKEIN_UNROLL_512 : 1)) {
- R512_8_ROUNDS(0);
- #if R512_UNROLL_R(1)
- R512_8_ROUNDS(1);
- #endif
- #if R512_UNROLL_R(2)
- R512_8_ROUNDS(2);
- #endif
- #if R512_UNROLL_R(3)
- R512_8_ROUNDS(3);
- #endif
- #if R512_UNROLL_R(4)
- R512_8_ROUNDS(4);
- #endif
- #if R512_UNROLL_R(5)
- R512_8_ROUNDS(5);
- #endif
- #if R512_UNROLL_R(6)
- R512_8_ROUNDS(6);
- #endif
- #if R512_UNROLL_R(7)
- R512_8_ROUNDS(7);
- #endif
- #if R512_UNROLL_R(8)
- R512_8_ROUNDS(8);
- #endif
- #if R512_UNROLL_R(9)
- R512_8_ROUNDS(9);
- #endif
- #if R512_UNROLL_R(10)
- R512_8_ROUNDS(10);
- #endif
- #if R512_UNROLL_R(11)
- R512_8_ROUNDS(11);
- #endif
- #if R512_UNROLL_R(12)
- R512_8_ROUNDS(12);
- #endif
- #if R512_UNROLL_R(13)
- R512_8_ROUNDS(13);
- #endif
- #if R512_UNROLL_R(14)
- R512_8_ROUNDS(14);
- #endif
- }
- /* do the final "feedforward" xor, update context chaining */
- ctx->x[0] = X0 ^ w[0];
- ctx->x[1] = X1 ^ w[1];
- ctx->x[2] = X2 ^ w[2];
- ctx->x[3] = X3 ^ w[3];
- ctx->x[4] = X4 ^ w[4];
- ctx->x[5] = X5 ^ w[5];
- ctx->x[6] = X6 ^ w[6];
- ctx->x[7] = X7 ^ w[7];
- ts[1] &= ~SKEIN_T1_FLAG_FIRST;
- } while (--blk_cnt);
- ctx->h.tweak[0] = ts[0];
- ctx->h.tweak[1] = ts[1];
- }
- #if defined(SKEIN_CODE_SIZE) || defined(SKEIN_PERF)
- size_t skein_512_process_block_code_size(void)
- {
- return ((u8 *) skein_512_process_block_code_size) -
- ((u8 *) skein_512_process_block);
- }
- unsigned int skein_512_unroll_cnt(void)
- {
- return SKEIN_UNROLL_512;
- }
- #endif
- #endif
- /***************************** SKEIN_1024 ******************************/
- #if !(SKEIN_USE_ASM & 1024)
- void skein_1024_process_block(struct skein_1024_ctx *ctx, const u8 *blk_ptr,
- size_t blk_cnt, size_t byte_cnt_add)
- { /* do it in C, always looping (unrolled is bigger AND slower!) */
- enum {
- WCNT = SKEIN_1024_STATE_WORDS
- };
- size_t r;
- #if (SKEIN_UNROLL_1024 != 0)
- u64 kw[WCNT+4+RCNT*2]; /* key sched: chaining vars + tweak + "rot" */
- #else
- u64 kw[WCNT+4]; /* key schedule words : chaining vars + tweak */
- #endif
- /* local copy of vars, for speed */
- u64 X00, X01, X02, X03, X04, X05, X06, X07,
- X08, X09, X10, X11, X12, X13, X14, X15;
- u64 w[WCNT]; /* local copy of input block */
- skein_assert(blk_cnt != 0); /* never call with blk_cnt == 0! */
- ts[0] = ctx->h.tweak[0];
- ts[1] = ctx->h.tweak[1];
- do {
- /*
- * this implementation only supports 2**64 input bytes
- * (no carry out here)
- */
- ts[0] += byte_cnt_add; /* update processed length */
- /* precompute the key schedule for this block */
- ks[0] = ctx->x[0];
- ks[1] = ctx->x[1];
- ks[2] = ctx->x[2];
- ks[3] = ctx->x[3];
- ks[4] = ctx->x[4];
- ks[5] = ctx->x[5];
- ks[6] = ctx->x[6];
- ks[7] = ctx->x[7];
- ks[8] = ctx->x[8];
- ks[9] = ctx->x[9];
- ks[10] = ctx->x[10];
- ks[11] = ctx->x[11];
- ks[12] = ctx->x[12];
- ks[13] = ctx->x[13];
- ks[14] = ctx->x[14];
- ks[15] = ctx->x[15];
- ks[16] = ks[0] ^ ks[1] ^ ks[2] ^ ks[3] ^
- ks[4] ^ ks[5] ^ ks[6] ^ ks[7] ^
- ks[8] ^ ks[9] ^ ks[10] ^ ks[11] ^
- ks[12] ^ ks[13] ^ ks[14] ^ ks[15] ^ SKEIN_KS_PARITY;
- ts[2] = ts[0] ^ ts[1];
- /* get input block in little-endian format */
- skein_get64_lsb_first(w, blk_ptr, WCNT);
- debug_save_tweak(ctx);
- /* do the first full key injection */
- X00 = w[0] + ks[0];
- X01 = w[1] + ks[1];
- X02 = w[2] + ks[2];
- X03 = w[3] + ks[3];
- X04 = w[4] + ks[4];
- X05 = w[5] + ks[5];
- X06 = w[6] + ks[6];
- X07 = w[7] + ks[7];
- X08 = w[8] + ks[8];
- X09 = w[9] + ks[9];
- X10 = w[10] + ks[10];
- X11 = w[11] + ks[11];
- X12 = w[12] + ks[12];
- X13 = w[13] + ks[13] + ts[0];
- X14 = w[14] + ks[14] + ts[1];
- X15 = w[15] + ks[15];
- for (r = 1;
- r < (SKEIN_UNROLL_1024 ? 2 * RCNT : 2);
- r += (SKEIN_UNROLL_1024 ? 2 * SKEIN_UNROLL_1024 : 1)) {
- R1024_8_ROUNDS(0);
- #if R1024_UNROLL_R(1)
- R1024_8_ROUNDS(1);
- #endif
- #if R1024_UNROLL_R(2)
- R1024_8_ROUNDS(2);
- #endif
- #if R1024_UNROLL_R(3)
- R1024_8_ROUNDS(3);
- #endif
- #if R1024_UNROLL_R(4)
- R1024_8_ROUNDS(4);
- #endif
- #if R1024_UNROLL_R(5)
- R1024_8_ROUNDS(5);
- #endif
- #if R1024_UNROLL_R(6)
- R1024_8_ROUNDS(6);
- #endif
- #if R1024_UNROLL_R(7)
- R1024_8_ROUNDS(7);
- #endif
- #if R1024_UNROLL_R(8)
- R1024_8_ROUNDS(8);
- #endif
- #if R1024_UNROLL_R(9)
- R1024_8_ROUNDS(9);
- #endif
- #if R1024_UNROLL_R(10)
- R1024_8_ROUNDS(10);
- #endif
- #if R1024_UNROLL_R(11)
- R1024_8_ROUNDS(11);
- #endif
- #if R1024_UNROLL_R(12)
- R1024_8_ROUNDS(12);
- #endif
- #if R1024_UNROLL_R(13)
- R1024_8_ROUNDS(13);
- #endif
- #if R1024_UNROLL_R(14)
- R1024_8_ROUNDS(14);
- #endif
- }
- /* do the final "feedforward" xor, update context chaining */
- ctx->x[0] = X00 ^ w[0];
- ctx->x[1] = X01 ^ w[1];
- ctx->x[2] = X02 ^ w[2];
- ctx->x[3] = X03 ^ w[3];
- ctx->x[4] = X04 ^ w[4];
- ctx->x[5] = X05 ^ w[5];
- ctx->x[6] = X06 ^ w[6];
- ctx->x[7] = X07 ^ w[7];
- ctx->x[8] = X08 ^ w[8];
- ctx->x[9] = X09 ^ w[9];
- ctx->x[10] = X10 ^ w[10];
- ctx->x[11] = X11 ^ w[11];
- ctx->x[12] = X12 ^ w[12];
- ctx->x[13] = X13 ^ w[13];
- ctx->x[14] = X14 ^ w[14];
- ctx->x[15] = X15 ^ w[15];
- ts[1] &= ~SKEIN_T1_FLAG_FIRST;
- blk_ptr += SKEIN_1024_BLOCK_BYTES;
- } while (--blk_cnt);
- ctx->h.tweak[0] = ts[0];
- ctx->h.tweak[1] = ts[1];
- }
- #if defined(SKEIN_CODE_SIZE) || defined(SKEIN_PERF)
- size_t skein_1024_process_block_code_size(void)
- {
- return ((u8 *) skein_1024_process_block_code_size) -
- ((u8 *) skein_1024_process_block);
- }
- unsigned int skein_1024_unroll_cnt(void)
- {
- return SKEIN_UNROLL_1024;
- }
- #endif
- #endif
|