[PATCH v3 2/3] drivers: staging: skein: In progress
From: Eric Rost
Date: Tue Sep 30 2014 - 03:02:25 EST
In progress commit
Signed-off-by: Eric Rost <eric.rost@xxxxxxxxxxxxx>
---
drivers/staging/skein/skein_block.c | 132 +++++++++++++++++++----------------
1 file changed, 70 insertions(+), 62 deletions(-)
diff --git a/drivers/staging/skein/skein_block.c b/drivers/staging/skein/skein_block.c
index 71c14f5..b8e4bd8 100644
--- a/drivers/staging/skein/skein_block.c
+++ b/drivers/staging/skein/skein_block.c
@@ -42,17 +42,9 @@
#define debug_save_tweak(ctx)
#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
- };
#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
@@ -63,56 +55,7 @@ void skein_256_process_block(struct skein_256_ctx *ctx, const u8 *blk_ptr,
#if (RCNT % SKEIN_UNROLL_256)
#error "Invalid SKEIN_UNROLL_256" /* sanity check on unroll count */
#endif
- size_t r;
- u64 kw[WCNT+4+RCNT*2]; /* key schedule: chaining vars + tweak + "rot"*/
-#else
- u64 kw[WCNT+4]; /* key schedule words : chaining vars + tweak */
#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);
- skein_show_block(BLK_BITS, &ctx->h, ctx->x, blk_ptr, w, ks, ts);
-
- /* 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];
-
- /* show starting state values */
- skein_show_r_ptr(BLK_BITS, &ctx->h, SKEIN_RND_KEY_INITIAL,
- x_ptr);
-
- blk_ptr += SKEIN_256_BLOCK_BYTES;
-
- /* run the rounds */
-
#define ROUND256(p0, p1, p2, p3, ROT, r_num) \
do { \
X##p0 += X##p1; \
@@ -159,10 +102,7 @@ do { \
ts[r + (R) + 2] = ts[r + (R) - 1]; \
skein_show_r_ptr(BLK_BITS, &ctx->h, SKEIN_RND_KEY_INJECT, X_ptr); \
} while (0)
-
- for (r = 1; r < 2 * RCNT; r += 2 * SKEIN_UNROLL_256)
#endif
- {
#define R256_8_ROUNDS(R) \
do { \
R256(0, 1, 2, 3, R_256_0, 8 * (R) + 1); \
@@ -177,13 +117,81 @@ do { \
I256(2 * (R) + 1); \
} while (0)
- R256_8_ROUNDS(0);
-
#define R256_UNROLL_R(NN) \
((SKEIN_UNROLL_256 == 0 && \
SKEIN_256_ROUNDS_TOTAL / 8 > (NN)) || \
(SKEIN_UNROLL_256 > (NN)))
+#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
+ };
+
+#if SKEIN_UNROLL_256
+ size_t r;
+ u64 kw[WCNT+4+RCNT*2]; /* key schedule: chaining vars + tweak + "rot"*/
+#else
+ u64 kw[WCNT+4]; /* key schedule words : chaining vars + tweak */
+#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);
+ skein_show_block(BLK_BITS, &ctx->h, ctx->x, blk_ptr, w, ks, ts);
+
+ /* 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];
+
+ /* show starting state values */
+ skein_show_r_ptr(BLK_BITS, &ctx->h, SKEIN_RND_KEY_INITIAL,
+ x_ptr);
+
+ blk_ptr += SKEIN_256_BLOCK_BYTES;
+
+ /* run the rounds */
+#if SKEIN_UNROLL_256
+
+ for (r = 1; r < 2 * RCNT; r += 2 * SKEIN_UNROLL_256)
+#endif
+ {
+
+ R256_8_ROUNDS(0);
+
#if R256_UNROLL_R(1)
R256_8_ROUNDS(1);
#endif
--
1.7.10.4
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