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crypto: serpent/avx - avoid using temporary stack buffers 

Introduce new assembler functions to avoid use temporary stack buffers in glue
code. This also allows use of vector instructions for xoring output in CTR and
CBC modes and construction of IVs for CTR mode.

ECB mode sees ~0.5% decrease in speed because added one extra function
call. CBC mode decryption and CTR mode benefit from vector operations
and gain ~3%.

Signed-off-by: Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Jussi Kivilinna 2012-10-20 15:06:51 +03:00 committed by Herbert Xu
parent 8435a3c300
commit facd416fbc
3 changed files with 121 additions and 115 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

166
arch/x86/crypto/serpent-avx-x86_64-asm_64.S
View File

@ -24,7 +24,16 @@
* *
*/ */
#include "glue_helper-asm-avx.S"
.file "serpent-avx-x86_64-asm_64.S" .file "serpent-avx-x86_64-asm_64.S"
.data
.align 16
.Lbswap128_mask:
.byte 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0
.text .text
#define CTX %rdi #define CTX %rdi
@ -550,51 +559,27 @@
vpunpcklqdq x3, t2, x2; \ vpunpcklqdq x3, t2, x2; \
vpunpckhqdq x3, t2, x3; vpunpckhqdq x3, t2, x3;
#define read_blocks(in, x0, x1, x2, x3, t0, t1, t2) \ #define read_blocks(x0, x1, x2, x3, t0, t1, t2) \
vmovdqu (0*4*4)(in), x0; \
vmovdqu (1*4*4)(in), x1; \
vmovdqu (2*4*4)(in), x2; \
vmovdqu (3*4*4)(in), x3; \
\
transpose_4x4(x0, x1, x2, x3, t0, t1, t2) transpose_4x4(x0, x1, x2, x3, t0, t1, t2)
#define write_blocks(out, x0, x1, x2, x3, t0, t1, t2) \ #define write_blocks(x0, x1, x2, x3, t0, t1, t2) \
transpose_4x4(x0, x1, x2, x3, t0, t1, t2) \ transpose_4x4(x0, x1, x2, x3, t0, t1, t2)
\
vmovdqu x0, (0*4*4)(out); \
vmovdqu x1, (1*4*4)(out); \
vmovdqu x2, (2*4*4)(out); \
vmovdqu x3, (3*4*4)(out);
#define xor_blocks(out, x0, x1, x2, x3, t0, t1, t2) \
transpose_4x4(x0, x1, x2, x3, t0, t1, t2) \
\
vpxor (0*4*4)(out), x0, x0; \
vmovdqu x0, (0*4*4)(out); \
vpxor (1*4*4)(out), x1, x1; \
vmovdqu x1, (1*4*4)(out); \
vpxor (2*4*4)(out), x2, x2; \
vmovdqu x2, (2*4*4)(out); \
vpxor (3*4*4)(out), x3, x3; \
vmovdqu x3, (3*4*4)(out);
.align 8 .align 8
.global __serpent_enc_blk_8way_avx .type __serpent_enc_blk8_avx,@function;
.type __serpent_enc_blk_8way_avx,@function;
__serpent_enc_blk_8way_avx: __serpent_enc_blk8_avx:
/* input: /* input:
* %rdi: ctx, CTX * %rdi: ctx, CTX
* %rsi: dst * RA1, RB1, RC1, RD1, RA2, RB2, RC2, RD2: blocks
* %rdx: src * output:
* %rcx: bool, if true: xor output * RA1, RB1, RC1, RD1, RA2, RB2, RC2, RD2: encrypted blocks
*/ */
vpcmpeqd RNOT, RNOT, RNOT; vpcmpeqd RNOT, RNOT, RNOT;
leaq (4*4*4)(%rdx), %rax; read_blocks(RA1, RB1, RC1, RD1, RK0, RK1, RK2);
read_blocks(%rdx, RA1, RB1, RC1, RD1, RK0, RK1, RK2); read_blocks(RA2, RB2, RC2, RD2, RK0, RK1, RK2);
read_blocks(%rax, RA2, RB2, RC2, RD2, RK0, RK1, RK2);
K2(RA, RB, RC, RD, RE, 0); K2(RA, RB, RC, RD, RE, 0);
S(S0, RA, RB, RC, RD, RE); LK2(RC, RB, RD, RA, RE, 1); S(S0, RA, RB, RC, RD, RE); LK2(RC, RB, RD, RA, RE, 1);
@ -630,38 +615,26 @@ __serpent_enc_blk_8way_avx:
S(S6, RA, RB, RD, RC, RE); LK2(RD, RE, RB, RC, RA, 31); S(S6, RA, RB, RD, RC, RE); LK2(RD, RE, RB, RC, RA, 31);
S(S7, RD, RE, RB, RC, RA); K2(RA, RB, RC, RD, RE, 32); S(S7, RD, RE, RB, RC, RA); K2(RA, RB, RC, RD, RE, 32);
leaq (4*4*4)(%rsi), %rax; write_blocks(RA1, RB1, RC1, RD1, RK0, RK1, RK2);
write_blocks(RA2, RB2, RC2, RD2, RK0, RK1, RK2);
testb %cl, %cl;
jnz __enc_xor8;
write_blocks(%rsi, RA1, RB1, RC1, RD1, RK0, RK1, RK2);
write_blocks(%rax, RA2, RB2, RC2, RD2, RK0, RK1, RK2);
ret;
__enc_xor8:
xor_blocks(%rsi, RA1, RB1, RC1, RD1, RK0, RK1, RK2);
xor_blocks(%rax, RA2, RB2, RC2, RD2, RK0, RK1, RK2);
ret; ret;
.align 8 .align 8
.global serpent_dec_blk_8way_avx .type __serpent_dec_blk8_avx,@function;
.type serpent_dec_blk_8way_avx,@function;
serpent_dec_blk_8way_avx: __serpent_dec_blk8_avx:
/* input: /* input:
* %rdi: ctx, CTX * %rdi: ctx, CTX
* %rsi: dst * RA1, RB1, RC1, RD1, RA2, RB2, RC2, RD2: encrypted blocks
* %rdx: src * output:
* RC1, RD1, RB1, RE1, RC2, RD2, RB2, RE2: decrypted blocks
*/ */
vpcmpeqd RNOT, RNOT, RNOT; vpcmpeqd RNOT, RNOT, RNOT;
leaq (4*4*4)(%rdx), %rax; read_blocks(RA1, RB1, RC1, RD1, RK0, RK1, RK2);
read_blocks(%rdx, RA1, RB1, RC1, RD1, RK0, RK1, RK2); read_blocks(RA2, RB2, RC2, RD2, RK0, RK1, RK2);
read_blocks(%rax, RA2, RB2, RC2, RD2, RK0, RK1, RK2);
K2(RA, RB, RC, RD, RE, 32); K2(RA, RB, RC, RD, RE, 32);
SP(SI7, RA, RB, RC, RD, RE, 31); KL2(RB, RD, RA, RE, RC, 31); SP(SI7, RA, RB, RC, RD, RE, 31); KL2(RB, RD, RA, RE, RC, 31);
@ -697,8 +670,85 @@ serpent_dec_blk_8way_avx:
SP(SI1, RD, RB, RC, RA, RE, 1); KL2(RE, RB, RC, RA, RD, 1); SP(SI1, RD, RB, RC, RA, RE, 1); KL2(RE, RB, RC, RA, RD, 1);
S(SI0, RE, RB, RC, RA, RD); K2(RC, RD, RB, RE, RA, 0); S(SI0, RE, RB, RC, RA, RD); K2(RC, RD, RB, RE, RA, 0);
leaq (4*4*4)(%rsi), %rax; write_blocks(RC1, RD1, RB1, RE1, RK0, RK1, RK2);
write_blocks(%rsi, RC1, RD1, RB1, RE1, RK0, RK1, RK2); write_blocks(RC2, RD2, RB2, RE2, RK0, RK1, RK2);
write_blocks(%rax, RC2, RD2, RB2, RE2, RK0, RK1, RK2);
ret;
.align 8
.global serpent_ecb_enc_8way_avx
.type serpent_ecb_enc_8way_avx,@function;
serpent_ecb_enc_8way_avx:
/* input:
* %rdi: ctx, CTX
* %rsi: dst
* %rdx: src
*/
load_8way(%rdx, RA1, RB1, RC1, RD1, RA2, RB2, RC2, RD2);
call __serpent_enc_blk8_avx;
store_8way(%rsi, RA1, RB1, RC1, RD1, RA2, RB2, RC2, RD2);
ret;
.align 8
.global serpent_ecb_dec_8way_avx
.type serpent_ecb_dec_8way_avx,@function;
serpent_ecb_dec_8way_avx:
/* input:
* %rdi: ctx, CTX
* %rsi: dst
* %rdx: src
*/
load_8way(%rdx, RA1, RB1, RC1, RD1, RA2, RB2, RC2, RD2);
call __serpent_dec_blk8_avx;
store_8way(%rsi, RC1, RD1, RB1, RE1, RC2, RD2, RB2, RE2);
ret;
.align 8
.global serpent_cbc_dec_8way_avx
.type serpent_cbc_dec_8way_avx,@function;
serpent_cbc_dec_8way_avx:
/* input:
* %rdi: ctx, CTX
* %rsi: dst
* %rdx: src
*/
load_8way(%rdx, RA1, RB1, RC1, RD1, RA2, RB2, RC2, RD2);
call __serpent_dec_blk8_avx;
store_cbc_8way(%rdx, %rsi, RC1, RD1, RB1, RE1, RC2, RD2, RB2, RE2);
ret;
.align 8
.global serpent_ctr_8way_avx
.type serpent_ctr_8way_avx,@function;
serpent_ctr_8way_avx:
/* input:
* %rdi: ctx, CTX
* %rsi: dst
* %rdx: src
* %rcx: iv (little endian, 128bit)
*/
load_ctr_8way(%rcx, .Lbswap128_mask, RA1, RB1, RC1, RD1, RA2, RB2, RC2,
RD2, RK0, RK1, RK2);
call __serpent_enc_blk8_avx;
store_ctr_8way(%rdx, %rsi, RA1, RB1, RC1, RD1, RA2, RB2, RC2, RD2);
ret; ret;

43
arch/x86/crypto/serpent_avx_glue.c
View File

@ -42,20 +42,6 @@
#include <asm/crypto/ablk_helper.h> #include <asm/crypto/ablk_helper.h>
#include <asm/crypto/glue_helper.h> #include <asm/crypto/glue_helper.h>
static void serpent_decrypt_cbc_xway(void *ctx, u128 *dst, const u128 *src)
{
u128 ivs[SERPENT_PARALLEL_BLOCKS - 1];
unsigned int j;
for (j = 0; j < SERPENT_PARALLEL_BLOCKS - 1; j++)
ivs[j] = src[j];
serpent_dec_blk_xway(ctx, (u8 *)dst, (u8 *)src);
for (j = 0; j < SERPENT_PARALLEL_BLOCKS - 1; j++)
u128_xor(dst + (j + 1), dst + (j + 1), ivs + j);
}
static void serpent_crypt_ctr(void *ctx, u128 *dst, const u128 *src, le128 *iv) static void serpent_crypt_ctr(void *ctx, u128 *dst, const u128 *src, le128 *iv)
{ {
be128 ctrblk; be128 ctrblk;
@ -67,30 +53,13 @@ static void serpent_crypt_ctr(void *ctx, u128 *dst, const u128 *src, le128 *iv)
u128_xor(dst, src, (u128 *)&ctrblk); u128_xor(dst, src, (u128 *)&ctrblk);
} }
static void serpent_crypt_ctr_xway(void *ctx, u128 *dst, const u128 *src,
le128 *iv)
{
be128 ctrblks[SERPENT_PARALLEL_BLOCKS];
unsigned int i;
for (i = 0; i < SERPENT_PARALLEL_BLOCKS; i++) {
if (dst != src)
dst[i] = src[i];
le128_to_be128(&ctrblks[i], iv);
le128_inc(iv);
}
serpent_enc_blk_xway_xor(ctx, (u8 *)dst, (u8 *)ctrblks);
}
static const struct common_glue_ctx serpent_enc = { static const struct common_glue_ctx serpent_enc = {
.num_funcs = 2, .num_funcs = 2,
.fpu_blocks_limit = SERPENT_PARALLEL_BLOCKS, .fpu_blocks_limit = SERPENT_PARALLEL_BLOCKS,
.funcs = { { .funcs = { {
.num_blocks = SERPENT_PARALLEL_BLOCKS, .num_blocks = SERPENT_PARALLEL_BLOCKS,
.fn_u = { .ecb = GLUE_FUNC_CAST(serpent_enc_blk_xway) } .fn_u = { .ecb = GLUE_FUNC_CAST(serpent_ecb_enc_8way_avx) }
}, { }, {
.num_blocks = 1, .num_blocks = 1,
.fn_u = { .ecb = GLUE_FUNC_CAST(__serpent_encrypt) } .fn_u = { .ecb = GLUE_FUNC_CAST(__serpent_encrypt) }
@ -103,7 +72,7 @@ static const struct common_glue_ctx serpent_ctr = {
.funcs = { { .funcs = { {
.num_blocks = SERPENT_PARALLEL_BLOCKS, .num_blocks = SERPENT_PARALLEL_BLOCKS,
.fn_u = { .ctr = GLUE_CTR_FUNC_CAST(serpent_crypt_ctr_xway) } .fn_u = { .ctr = GLUE_CTR_FUNC_CAST(serpent_ctr_8way_avx) }
}, { }, {
.num_blocks = 1, .num_blocks = 1,
.fn_u = { .ctr = GLUE_CTR_FUNC_CAST(serpent_crypt_ctr) } .fn_u = { .ctr = GLUE_CTR_FUNC_CAST(serpent_crypt_ctr) }
@ -116,7 +85,7 @@ static const struct common_glue_ctx serpent_dec = {
.funcs = { { .funcs = { {
.num_blocks = SERPENT_PARALLEL_BLOCKS, .num_blocks = SERPENT_PARALLEL_BLOCKS,
.fn_u = { .ecb = GLUE_FUNC_CAST(serpent_dec_blk_xway) } .fn_u = { .ecb = GLUE_FUNC_CAST(serpent_ecb_dec_8way_avx) }
}, { }, {
.num_blocks = 1, .num_blocks = 1,
.fn_u = { .ecb = GLUE_FUNC_CAST(__serpent_decrypt) } .fn_u = { .ecb = GLUE_FUNC_CAST(__serpent_decrypt) }
@ -129,7 +98,7 @@ static const struct common_glue_ctx serpent_dec_cbc = {
.funcs = { { .funcs = { {
.num_blocks = SERPENT_PARALLEL_BLOCKS, .num_blocks = SERPENT_PARALLEL_BLOCKS,
.fn_u = { .cbc = GLUE_CBC_FUNC_CAST(serpent_decrypt_cbc_xway) } .fn_u = { .cbc = GLUE_CBC_FUNC_CAST(serpent_cbc_dec_8way_avx) }
}, { }, {
.num_blocks = 1, .num_blocks = 1,
.fn_u = { .cbc = GLUE_CBC_FUNC_CAST(__serpent_decrypt) } .fn_u = { .cbc = GLUE_CBC_FUNC_CAST(__serpent_decrypt) }
@ -193,7 +162,7 @@ static void encrypt_callback(void *priv, u8 *srcdst, unsigned int nbytes)
ctx->fpu_enabled = serpent_fpu_begin(ctx->fpu_enabled, nbytes); ctx->fpu_enabled = serpent_fpu_begin(ctx->fpu_enabled, nbytes);
if (nbytes == bsize * SERPENT_PARALLEL_BLOCKS) { if (nbytes == bsize * SERPENT_PARALLEL_BLOCKS) {
serpent_enc_blk_xway(ctx->ctx, srcdst, srcdst); serpent_ecb_enc_8way_avx(ctx->ctx, srcdst, srcdst);
return; return;
} }
@ -210,7 +179,7 @@ static void decrypt_callback(void *priv, u8 *srcdst, unsigned int nbytes)
ctx->fpu_enabled = serpent_fpu_begin(ctx->fpu_enabled, nbytes); ctx->fpu_enabled = serpent_fpu_begin(ctx->fpu_enabled, nbytes);
if (nbytes == bsize * SERPENT_PARALLEL_BLOCKS) { if (nbytes == bsize * SERPENT_PARALLEL_BLOCKS) {
serpent_dec_blk_xway(ctx->ctx, srcdst, srcdst); serpent_ecb_dec_8way_avx(ctx->ctx, srcdst, srcdst);
return; return;
} }

27
arch/x86/include/asm/crypto/serpent-avx.h
View File

@ -6,27 +6,14 @@
#define SERPENT_PARALLEL_BLOCKS 8 #define SERPENT_PARALLEL_BLOCKS 8
asmlinkage void __serpent_enc_blk_8way_avx(struct serpent_ctx *ctx, u8 *dst, asmlinkage void serpent_ecb_enc_8way_avx(struct serpent_ctx *ctx, u8 *dst,
const u8 *src, bool xor); const u8 *src);
asmlinkage void serpent_dec_blk_8way_avx(struct serpent_ctx *ctx, u8 *dst, asmlinkage void serpent_ecb_dec_8way_avx(struct serpent_ctx *ctx, u8 *dst,
const u8 *src); const u8 *src);
static inline void serpent_enc_blk_xway(struct serpent_ctx *ctx, u8 *dst, asmlinkage void serpent_cbc_dec_8way_avx(struct serpent_ctx *ctx, u8 *dst,
const u8 *src) const u8 *src);
{ asmlinkage void serpent_ctr_8way_avx(struct serpent_ctx *ctx, u8 *dst,
__serpent_enc_blk_8way_avx(ctx, dst, src, false); const u8 *src, le128 *iv);
}
static inline void serpent_enc_blk_xway_xor(struct serpent_ctx *ctx, u8 *dst,
const u8 *src)
{
__serpent_enc_blk_8way_avx(ctx, dst, src, true);
}
static inline void serpent_dec_blk_xway(struct serpent_ctx *ctx, u8 *dst,
const u8 *src)
{
serpent_dec_blk_8way_avx(ctx, dst, src);
}
#endif #endif