/***********************************************************************
**
** 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