crypto/skein/skein_block.c

/*
 * 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]
 */
/* Copyright 2013 Doug Whiting. This code is released to the public domain. */

#include <sys/skein.h>
#include "skein_impl.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

/* some useful definitions for code here */
#define BLK_BITS    (WCNT*64)
#define KW_TWK_BASE (0)
#define KW_KEY_BASE (3)
#define ks      (kw + KW_KEY_BASE)
#define ts      (kw + KW_TWK_BASE)

/* no debugging in Illumos version */
#define DebugSaveTweak(ctx)

/* Skein_256 */
#if !(SKEIN_USE_ASM & 256)
void
Skein_256_Process_Block(Skein_256_Ctxt_t *ctx, const uint8_t *blkPtr,
    size_t blkCnt, size_t byteCntAdd)
{               /* do it in C */
    enum {
        WCNT = SKEIN_256_STATE_WORDS
    };
#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
    size_t r;
    /* key schedule words : chaining vars + tweak + "rotation" */
    uint64_t kw[WCNT + 4 + RCNT * 2];
#else
    uint64_t kw[WCNT + 4];  /* key schedule words : chaining vars + tweak */
#endif
    /* local copy of context vars, for speed */
    uint64_t X0, X1, X2, X3;
    uint64_t w[WCNT];       /* local copy of input block */
#ifdef  SKEIN_DEBUG
    /* use for debugging (help compiler put Xn in registers) */
    const uint64_t *Xptr[4];
    Xptr[0] = &X0;
    Xptr[1] = &X1;
    Xptr[2] = &X2;
    Xptr[3] = &X3;
#endif
    Skein_assert(blkCnt != 0);  /* never call with blkCnt == 0! */
    ts[0] = ctx->h.T[0];
    ts[1] = ctx->h.T[1];
    do {
        /*
         * this implementation only supports 2**64 input bytes
         * (no carry out here)
         */
        ts[0] += byteCntAdd;    /* 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, blkPtr, WCNT);
        DebugSaveTweak(ctx);
        Skein_Show_Block(BLK_BITS, &ctx->h, ctx->X, blkPtr, w, ks, ts);

        X0 = w[0] + ks[0];  /* do the first full key injection */
        X1 = w[1] + ks[1] + ts[0];
        X2 = w[2] + ks[2] + ts[1];
        X3 = w[3] + ks[3];

        Skein_Show_R_Ptr(BLK_BITS, &ctx->h, SKEIN_RND_KEY_INITIAL,
            Xptr);  /* show starting state values */

        blkPtr += SKEIN_256_BLOCK_BYTES;

        /* run the rounds */

#define Round256(p0, p1, p2, p3, ROT, rNum)                          \
    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; \

#if SKEIN_UNROLL_256 == 0
#define R256(p0, p1, p2, p3, ROT, rNum)     /* fully unrolled */    \
    Round256(p0, p1, p2, p3, ROT, rNum)                 \
    Skein_Show_R_Ptr(BLK_BITS, &ctx->h, rNum, Xptr);

#define I256(R)                             \
    X0 += ks[((R) + 1) % 5];    /* inject the key schedule value */ \
    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;                  \
    Skein_Show_R_Ptr(BLK_BITS, &ctx->h, SKEIN_RND_KEY_INJECT, Xptr);
#else               /* looping version */
#define R256(p0, p1, p2, p3, ROT, rNum)                             \
    Round256(p0, p1, p2, p3, ROT, rNum)                             \
    Skein_Show_R_Ptr(BLK_BITS, &ctx->h, 4 * (r - 1) + rNum, Xptr);

#define I256(R)                             \
    X0 += ks[r + (R) + 0];  /* inject the key schedule value */ \
    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);                \
    ks[r + (R) + 4] = ks[r + (R) - 1];   /* rotate key schedule */  \
    ts[r + (R) + 2] = ts[r + (R) - 1];                  \
    Skein_Show_R_Ptr(BLK_BITS, &ctx->h, SKEIN_RND_KEY_INJECT, Xptr);

        /* loop thru it */
        for (r = 1; r < 2 * RCNT; r += 2 * SKEIN_UNROLL_256)
#endif
        {
#define R256_8_rounds(R)                         \
    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);

            R256_8_rounds(0);

#define R256_Unroll_R(NN) \
    ((SKEIN_UNROLL_256 == 0 && SKEIN_256_ROUNDS_TOTAL / 8 > (NN)) || \
    (SKEIN_UNROLL_256 > (NN)))

#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
#if (SKEIN_UNROLL_256 > 14)
#error  "need more unrolling in Skein_256_Process_Block"
#endif
        }
        /*
         * do the final "feedforward" xor, update context chaining vars
         */
        ctx->X[0] = X0 ^ w[0];
        ctx->X[1] = X1 ^ w[1];
        ctx->X[2] = X2 ^ w[2];
        ctx->X[3] = X3 ^ w[3];

        Skein_Show_Round(BLK_BITS, &ctx->h, SKEIN_RND_FEED_FWD, ctx->X);

        ts[1] &= ~SKEIN_T1_FLAG_FIRST;
    }
    while (--blkCnt);
    ctx->h.T[0] = ts[0];
    ctx->h.T[1] = ts[1];
}

#if defined(SKEIN_CODE_SIZE) || defined(SKEIN_PERF)
size_t
Skein_256_Process_Block_CodeSize(void)
{
    return ((uint8_t *)Skein_256_Process_Block_CodeSize) -
        ((uint8_t *)Skein_256_Process_Block);
}

uint_t
Skein_256_Unroll_Cnt(void)
{
    return (SKEIN_UNROLL_256);
}
#endif
#endif

/* Skein_512 */
#if !(SKEIN_USE_ASM & 512)
void
Skein_512_Process_Block(Skein_512_Ctxt_t *ctx, const uint8_t *blkPtr,
    size_t blkCnt, size_t byteCntAdd)
{               /* do it in C */
    enum {
        WCNT = SKEIN_512_STATE_WORDS
    };
#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
    size_t r;
    /* key schedule words : chaining vars + tweak + "rotation" */
    uint64_t kw[WCNT + 4 + RCNT * 2];
#else
    uint64_t kw[WCNT + 4];  /* key schedule words : chaining vars + tweak */
#endif
    /* local copy of vars, for speed */
    uint64_t X0, X1, X2, X3, X4, X5, X6, X7;
    uint64_t w[WCNT];       /* local copy of input block */
#ifdef  SKEIN_DEBUG
    /* use for debugging (help compiler put Xn in registers) */
    const uint64_t *Xptr[8];
    Xptr[0] = &X0;
    Xptr[1] = &X1;
    Xptr[2] = &X2;
    Xptr[3] = &X3;
    Xptr[4] = &X4;
    Xptr[5] = &X5;
    Xptr[6] = &X6;
    Xptr[7] = &X7;
#endif

    Skein_assert(blkCnt != 0);  /* never call with blkCnt == 0! */
    ts[0] = ctx->h.T[0];
    ts[1] = ctx->h.T[1];
    do {
        /*
         * this implementation only supports 2**64 input bytes
         * (no carry out here)
         */
        ts[0] += byteCntAdd;    /* 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, blkPtr, WCNT);
        DebugSaveTweak(ctx);
        Skein_Show_Block(BLK_BITS, &ctx->h, ctx->X, blkPtr, w, ks, ts);

        X0 = w[0] + ks[0];  /* do the first full key injection */
        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];

        blkPtr += SKEIN_512_BLOCK_BYTES;

        Skein_Show_R_Ptr(BLK_BITS, &ctx->h, SKEIN_RND_KEY_INITIAL,
            Xptr);
        /* run the rounds */
#define Round512(p0, p1, p2, p3, p4, p5, p6, p7, ROT, rNum)     \
    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;

#if SKEIN_UNROLL_512 == 0
#define R512(p0, p1, p2, p3, p4, p5, p6, p7, ROT, rNum) /* unrolled */  \
    Round512(p0, p1, p2, p3, p4, p5, p6, p7, ROT, rNum)     \
    Skein_Show_R_Ptr(BLK_BITS, &ctx->h, rNum, Xptr);

#define I512(R)                             \
    X0 += ks[((R) + 1) % 9];    /* inject the key schedule value */\
    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;              \
    Skein_Show_R_Ptr(BLK_BITS, &ctx->h, SKEIN_RND_KEY_INJECT, Xptr);
#else               /* looping version */
#define R512(p0, p1, p2, p3, p4, p5, p6, p7, ROT, rNum)         \
    Round512(p0, p1, p2, p3, p4, p5, p6, p7, ROT, rNum)     \
    Skein_Show_R_Ptr(BLK_BITS, &ctx->h, 4 * (r - 1) + rNum, Xptr);

#define I512(R)                             \
    X0 += ks[r + (R) + 0];  /* inject the key schedule value */ \
    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);                \
    ks[r + (R)+8] = ks[r + (R) - 1];    /* rotate key schedule */\
    ts[r + (R)+2] = ts[r + (R) - 1];                \
    Skein_Show_R_Ptr(BLK_BITS, &ctx->h, SKEIN_RND_KEY_INJECT, Xptr);

        /* loop thru it */
        for (r = 1; r < 2 * RCNT; r += 2 * SKEIN_UNROLL_512)
#endif              /* end of looped code definitions */
        {
#define R512_8_rounds(R)    /* do 8 full rounds */          \
    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 */

            R512_8_rounds(0);

#define R512_Unroll_R(NN) \
    ((SKEIN_UNROLL_512 == 0 && SKEIN_512_ROUNDS_TOTAL / 8 > (NN)) || \
    (SKEIN_UNROLL_512 > (NN)))

#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
#if (SKEIN_UNROLL_512 > 14)
#error "need more unrolling in Skein_512_Process_Block"
#endif
        }

        /*
         * do the final "feedforward" xor, update context chaining vars
         */
        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];
        Skein_Show_Round(BLK_BITS, &ctx->h, SKEIN_RND_FEED_FWD, ctx->X);

        ts[1] &= ~SKEIN_T1_FLAG_FIRST;
    }
    while (--blkCnt);
    ctx->h.T[0] = ts[0];
    ctx->h.T[1] = ts[1];
}

#if defined(SKEIN_CODE_SIZE) || defined(SKEIN_PERF)
size_t
Skein_512_Process_Block_CodeSize(void)
{
    return ((uint8_t *)Skein_512_Process_Block_CodeSize) -
        ((uint8_t *)Skein_512_Process_Block);
}

uint_t
Skein_512_Unroll_Cnt(void)
{
    return (SKEIN_UNROLL_512);
}
#endif
#endif

/*  Skein1024 */
#if !(SKEIN_USE_ASM & 1024)
void
Skein1024_Process_Block(Skein1024_Ctxt_t *ctx, const uint8_t *blkPtr,
    size_t blkCnt, size_t byteCntAdd)
{
    /* do it in C, always looping (unrolled is bigger AND slower!) */
    enum {
        WCNT = SKEIN1024_STATE_WORDS
    };
#undef  RCNT
#define RCNT  (SKEIN1024_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
    size_t r;
    /* key schedule words : chaining vars + tweak + "rotation" */
    uint64_t kw[WCNT + 4 + RCNT * 2];
#else
    uint64_t kw[WCNT + 4];  /* key schedule words : chaining vars + tweak */
#endif

    /* local copy of vars, for speed */
    uint64_t X00, X01, X02, X03, X04, X05, X06, X07, X08, X09, X10, X11,
        X12, X13, X14, X15;
    uint64_t w[WCNT];       /* local copy of input block */
#ifdef  SKEIN_DEBUG
    /* use for debugging (help compiler put Xn in registers) */
    const uint64_t *Xptr[16];
    Xptr[0] = &X00;
    Xptr[1] = &X01;
    Xptr[2] = &X02;
    Xptr[3] = &X03;
    Xptr[4] = &X04;
    Xptr[5] = &X05;
    Xptr[6] = &X06;
    Xptr[7] = &X07;
    Xptr[8] = &X08;
    Xptr[9] = &X09;
    Xptr[10] = &X10;
    Xptr[11] = &X11;
    Xptr[12] = &X12;
    Xptr[13] = &X13;
    Xptr[14] = &X14;
    Xptr[15] = &X15;
#endif

    Skein_assert(blkCnt != 0);  /* never call with blkCnt == 0! */
    ts[0] = ctx->h.T[0];
    ts[1] = ctx->h.T[1];
    do {
        /*
         * this implementation only supports 2**64 input bytes
         * (no carry out here)
         */
        ts[0] += byteCntAdd;    /* 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, blkPtr, WCNT);
        DebugSaveTweak(ctx);
        Skein_Show_Block(BLK_BITS, &ctx->h, ctx->X, blkPtr, w, ks, ts);

        X00 = w[0] + ks[0]; /* do the first full key injection */
        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];

        Skein_Show_R_Ptr(BLK_BITS, &ctx->h, SKEIN_RND_KEY_INITIAL,
            Xptr);

#define Round1024(p0, p1, p2, p3, p4, p5, p6, p7, p8, p9, pA, pB, pC,   \
    pD, pE, pF, ROT, rNum)                      \
    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;

#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)                        \
    Skein_Show_R_Ptr(BLK_BITS, &ctx->h, rn, Xptr);

#define I1024(R)                            \
    X00 += ks[((R) + 1) % 17];  /* inject the key schedule value */\
    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;                \
    Skein_Show_R_Ptr(BLK_BITS, &ctx->h, SKEIN_RND_KEY_INJECT, Xptr);
#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)                        \
    Skein_Show_R_Ptr(BLK_BITS, &ctx->h, 4 * (r - 1) + rn, Xptr);

#define I1024(R)                            \
    X00 += ks[r + (R) + 0]; /* inject the key schedule value */ \
    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);             \
    ks[r + (R) + 16] = ks[r + (R) - 1]; /* rotate key schedule */\
    ts[r + (R) + 2] = ts[r + (R) - 1];              \
    Skein_Show_R_Ptr(BLK_BITS, &ctx->h, SKEIN_RND_KEY_INJECT, Xptr);

        /* loop thru it */
        for (r = 1; r <= 2 * RCNT; r += 2 * SKEIN_UNROLL_1024)
#endif
        {
#define R1024_8_rounds(R)   /* do 8 full rounds */          \
    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);

            R1024_8_rounds(0);

#define R1024_Unroll_R(NN)                      \
    ((SKEIN_UNROLL_1024 == 0 && SKEIN1024_ROUNDS_TOTAL/8 > (NN)) || \
    (SKEIN_UNROLL_1024 > (NN)))

#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
#if (SKEIN_UNROLL_1024 > 14)
#error  "need more unrolling in Skein_1024_Process_Block"
#endif
        }
        /*
         * do the final "feedforward" xor, update context chaining vars
         */

        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];

        Skein_Show_Round(BLK_BITS, &ctx->h, SKEIN_RND_FEED_FWD, ctx->X);

        ts[1] &= ~SKEIN_T1_FLAG_FIRST;
        blkPtr += SKEIN1024_BLOCK_BYTES;
    } while (--blkCnt);
    ctx->h.T[0] = ts[0];
    ctx->h.T[1] = ts[1];
}

#if defined(SKEIN_CODE_SIZE) || defined(SKEIN_PERF)
size_t
Skein1024_Process_Block_CodeSize(void)
{
    return ((uint8_t *)Skein1024_Process_Block_CodeSize) -
        ((uint8_t *)Skein1024_Process_Block);
}

uint_t
Skein1024_Unroll_Cnt(void)
{
    return (SKEIN_UNROLL_1024);
}
#endif
#endif