From a05248ed2d9a83ae7c3e6db7c4ef9331c3dedc81 Mon Sep 17 00:00:00 2001 From: Jussi Kivilinna Date: Mon, 8 Apr 2013 21:50:55 +0300 Subject: [PATCH] crypto: x86 - add more optimized XTS-mode for serpent-avx This patch adds AVX optimized XTS-mode helper functions/macros and converts serpent-avx to use the new facilities. Benefits are slightly improved speed and reduced stack usage as use of temporary IV-array is avoided. tcrypt results, with Intel i5-2450M: enc dec 16B 1.00x 1.00x 64B 1.00x 1.00x 256B 1.04x 1.06x 1024B 1.09x 1.09x 8192B 1.10x 1.09x Signed-off-by: Jussi Kivilinna Signed-off-by: Herbert Xu --- arch/x86/crypto/glue_helper-asm-avx.S | 61 +++++++++++++++++- arch/x86/crypto/glue_helper.c | 97 ++++++++++++++++++++++++++++- arch/x86/crypto/serpent-avx-x86_64-asm_64.S | 45 ++++++++++++- arch/x86/crypto/serpent_avx_glue.c | 87 +++++++++++++------------- arch/x86/include/asm/crypto/glue_helper.h | 24 +++++++ arch/x86/include/asm/crypto/serpent-avx.h | 5 ++ 6 files changed, 273 insertions(+), 46 deletions(-) diff --git a/arch/x86/crypto/glue_helper-asm-avx.S b/arch/x86/crypto/glue_helper-asm-avx.S index f7b6ea2..02ee230 100644 --- a/arch/x86/crypto/glue_helper-asm-avx.S +++ b/arch/x86/crypto/glue_helper-asm-avx.S @@ -1,7 +1,7 @@ /* * Shared glue code for 128bit block ciphers, AVX assembler macros * - * Copyright (c) 2012 Jussi Kivilinna + * Copyright © 2012-2013 Jussi Kivilinna * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by @@ -89,3 +89,62 @@ vpxor (6*16)(src), x6, x6; \ vpxor (7*16)(src), x7, x7; \ store_8way(dst, x0, x1, x2, x3, x4, x5, x6, x7); + +#define gf128mul_x_ble(iv, mask, tmp) \ + vpsrad $31, iv, tmp; \ + vpaddq iv, iv, iv; \ + vpshufd $0x13, tmp, tmp; \ + vpand mask, tmp, tmp; \ + vpxor tmp, iv, iv; + +#define load_xts_8way(iv, src, dst, x0, x1, x2, x3, x4, x5, x6, x7, tiv, t0, \ + t1, xts_gf128mul_and_shl1_mask) \ + vmovdqa xts_gf128mul_and_shl1_mask, t0; \ + \ + /* load IV */ \ + vmovdqu (iv), tiv; \ + vpxor (0*16)(src), tiv, x0; \ + vmovdqu tiv, (0*16)(dst); \ + \ + /* construct and store IVs, also xor with source */ \ + gf128mul_x_ble(tiv, t0, t1); \ + vpxor (1*16)(src), tiv, x1; \ + vmovdqu tiv, (1*16)(dst); \ + \ + gf128mul_x_ble(tiv, t0, t1); \ + vpxor (2*16)(src), tiv, x2; \ + vmovdqu tiv, (2*16)(dst); \ + \ + gf128mul_x_ble(tiv, t0, t1); \ + vpxor (3*16)(src), tiv, x3; \ + vmovdqu tiv, (3*16)(dst); \ + \ + gf128mul_x_ble(tiv, t0, t1); \ + vpxor (4*16)(src), tiv, x4; \ + vmovdqu tiv, (4*16)(dst); \ + \ + gf128mul_x_ble(tiv, t0, t1); \ + vpxor (5*16)(src), tiv, x5; \ + vmovdqu tiv, (5*16)(dst); \ + \ + gf128mul_x_ble(tiv, t0, t1); \ + vpxor (6*16)(src), tiv, x6; \ + vmovdqu tiv, (6*16)(dst); \ + \ + gf128mul_x_ble(tiv, t0, t1); \ + vpxor (7*16)(src), tiv, x7; \ + vmovdqu tiv, (7*16)(dst); \ + \ + gf128mul_x_ble(tiv, t0, t1); \ + vmovdqu tiv, (iv); + +#define store_xts_8way(dst, x0, x1, x2, x3, x4, x5, x6, x7) \ + vpxor (0*16)(dst), x0, x0; \ + vpxor (1*16)(dst), x1, x1; \ + vpxor (2*16)(dst), x2, x2; \ + vpxor (3*16)(dst), x3, x3; \ + vpxor (4*16)(dst), x4, x4; \ + vpxor (5*16)(dst), x5, x5; \ + vpxor (6*16)(dst), x6, x6; \ + vpxor (7*16)(dst), x7, x7; \ + store_8way(dst, x0, x1, x2, x3, x4, x5, x6, x7); diff --git a/arch/x86/crypto/glue_helper.c b/arch/x86/crypto/glue_helper.c index 22ce4f6..432f1d76 100644 --- a/arch/x86/crypto/glue_helper.c +++ b/arch/x86/crypto/glue_helper.c @@ -1,7 +1,7 @@ /* * Shared glue code for 128bit block ciphers * - * Copyright (c) 2012 Jussi Kivilinna + * Copyright © 2012-2013 Jussi Kivilinna * * CBC & ECB parts based on code (crypto/cbc.c,ecb.c) by: * Copyright (c) 2006 Herbert Xu @@ -304,4 +304,99 @@ int glue_ctr_crypt_128bit(const struct common_glue_ctx *gctx, } EXPORT_SYMBOL_GPL(glue_ctr_crypt_128bit); +static unsigned int __glue_xts_crypt_128bit(const struct common_glue_ctx *gctx, + void *ctx, + struct blkcipher_desc *desc, + struct blkcipher_walk *walk) +{ + const unsigned int bsize = 128 / 8; + unsigned int nbytes = walk->nbytes; + u128 *src = (u128 *)walk->src.virt.addr; + u128 *dst = (u128 *)walk->dst.virt.addr; + unsigned int num_blocks, func_bytes; + unsigned int i; + + /* Process multi-block batch */ + for (i = 0; i < gctx->num_funcs; i++) { + num_blocks = gctx->funcs[i].num_blocks; + func_bytes = bsize * num_blocks; + + if (nbytes >= func_bytes) { + do { + gctx->funcs[i].fn_u.xts(ctx, dst, src, + (le128 *)walk->iv); + + src += num_blocks; + dst += num_blocks; + nbytes -= func_bytes; + } while (nbytes >= func_bytes); + + if (nbytes < bsize) + goto done; + } + } + +done: + return nbytes; +} + +/* for implementations implementing faster XTS IV generator */ +int glue_xts_crypt_128bit(const struct common_glue_ctx *gctx, + struct blkcipher_desc *desc, struct scatterlist *dst, + struct scatterlist *src, unsigned int nbytes, + void (*tweak_fn)(void *ctx, u8 *dst, const u8 *src), + void *tweak_ctx, void *crypt_ctx) +{ + const unsigned int bsize = 128 / 8; + bool fpu_enabled = false; + struct blkcipher_walk walk; + int err; + + blkcipher_walk_init(&walk, dst, src, nbytes); + + err = blkcipher_walk_virt(desc, &walk); + nbytes = walk.nbytes; + if (!nbytes) + return err; + + /* set minimum length to bsize, for tweak_fn */ + fpu_enabled = glue_fpu_begin(bsize, gctx->fpu_blocks_limit, + desc, fpu_enabled, + nbytes < bsize ? bsize : nbytes); + + /* calculate first value of T */ + tweak_fn(tweak_ctx, walk.iv, walk.iv); + + while (nbytes) { + nbytes = __glue_xts_crypt_128bit(gctx, crypt_ctx, desc, &walk); + + err = blkcipher_walk_done(desc, &walk, nbytes); + nbytes = walk.nbytes; + } + + glue_fpu_end(fpu_enabled); + + return err; +} +EXPORT_SYMBOL_GPL(glue_xts_crypt_128bit); + +void glue_xts_crypt_128bit_one(void *ctx, u128 *dst, const u128 *src, le128 *iv, + common_glue_func_t fn) +{ + le128 ivblk = *iv; + + /* generate next IV */ + le128_gf128mul_x_ble(iv, &ivblk); + + /* CC <- T xor C */ + u128_xor(dst, src, (u128 *)&ivblk); + + /* PP <- D(Key2,CC) */ + fn(ctx, (u8 *)dst, (u8 *)dst); + + /* P <- T xor PP */ + u128_xor(dst, dst, (u128 *)&ivblk); +} +EXPORT_SYMBOL_GPL(glue_xts_crypt_128bit_one); + MODULE_LICENSE("GPL"); diff --git a/arch/x86/crypto/serpent-avx-x86_64-asm_64.S b/arch/x86/crypto/serpent-avx-x86_64-asm_64.S index 43c9386..2f202f4 100644 --- a/arch/x86/crypto/serpent-avx-x86_64-asm_64.S +++ b/arch/x86/crypto/serpent-avx-x86_64-asm_64.S @@ -4,8 +4,7 @@ * Copyright (C) 2012 Johannes Goetzfried * * - * Based on arch/x86/crypto/serpent-sse2-x86_64-asm_64.S by - * Copyright (C) 2011 Jussi Kivilinna + * Copyright © 2011-2013 Jussi Kivilinna * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by @@ -34,6 +33,8 @@ .Lbswap128_mask: .byte 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0 +.Lxts_gf128mul_and_shl1_mask: + .byte 0x87, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0 .text @@ -739,3 +740,43 @@ ENTRY(serpent_ctr_8way_avx) ret; ENDPROC(serpent_ctr_8way_avx) + +ENTRY(serpent_xts_enc_8way_avx) + /* input: + * %rdi: ctx, CTX + * %rsi: dst + * %rdx: src + * %rcx: iv (t ⊕ αⁿ ∈ GF(2¹²⁸)) + */ + + /* regs <= src, dst <= IVs, regs <= regs xor IVs */ + load_xts_8way(%rcx, %rdx, %rsi, RA1, RB1, RC1, RD1, RA2, RB2, RC2, RD2, + RK0, RK1, RK2, .Lxts_gf128mul_and_shl1_mask); + + call __serpent_enc_blk8_avx; + + /* dst <= regs xor IVs(in dst) */ + store_xts_8way(%rsi, RA1, RB1, RC1, RD1, RA2, RB2, RC2, RD2); + + ret; +ENDPROC(serpent_xts_enc_8way_avx) + +ENTRY(serpent_xts_dec_8way_avx) + /* input: + * %rdi: ctx, CTX + * %rsi: dst + * %rdx: src + * %rcx: iv (t ⊕ αⁿ ∈ GF(2¹²⁸)) + */ + + /* regs <= src, dst <= IVs, regs <= regs xor IVs */ + load_xts_8way(%rcx, %rdx, %rsi, RA1, RB1, RC1, RD1, RA2, RB2, RC2, RD2, + RK0, RK1, RK2, .Lxts_gf128mul_and_shl1_mask); + + call __serpent_dec_blk8_avx; + + /* dst <= regs xor IVs(in dst) */ + store_xts_8way(%rsi, RC1, RD1, RB1, RE1, RC2, RD2, RB2, RE2); + + ret; +ENDPROC(serpent_xts_dec_8way_avx) diff --git a/arch/x86/crypto/serpent_avx_glue.c b/arch/x86/crypto/serpent_avx_glue.c index 52abaaf..0f8519c 100644 --- a/arch/x86/crypto/serpent_avx_glue.c +++ b/arch/x86/crypto/serpent_avx_glue.c @@ -4,8 +4,7 @@ * Copyright (C) 2012 Johannes Goetzfried * * - * Glue code based on serpent_sse2_glue.c by: - * Copyright (C) 2011 Jussi Kivilinna + * Copyright © 2011-2013 Jussi Kivilinna * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by @@ -53,6 +52,18 @@ static void serpent_crypt_ctr(void *ctx, u128 *dst, const u128 *src, le128 *iv) u128_xor(dst, src, (u128 *)&ctrblk); } +static void serpent_xts_enc(void *ctx, u128 *dst, const u128 *src, le128 *iv) +{ + glue_xts_crypt_128bit_one(ctx, dst, src, iv, + GLUE_FUNC_CAST(__serpent_encrypt)); +} + +static void serpent_xts_dec(void *ctx, u128 *dst, const u128 *src, le128 *iv) +{ + glue_xts_crypt_128bit_one(ctx, dst, src, iv, + GLUE_FUNC_CAST(__serpent_decrypt)); +} + static const struct common_glue_ctx serpent_enc = { .num_funcs = 2, .fpu_blocks_limit = SERPENT_PARALLEL_BLOCKS, @@ -79,6 +90,19 @@ static const struct common_glue_ctx serpent_ctr = { } } }; +static const struct common_glue_ctx serpent_enc_xts = { + .num_funcs = 2, + .fpu_blocks_limit = SERPENT_PARALLEL_BLOCKS, + + .funcs = { { + .num_blocks = SERPENT_PARALLEL_BLOCKS, + .fn_u = { .xts = GLUE_XTS_FUNC_CAST(serpent_xts_enc_8way_avx) } + }, { + .num_blocks = 1, + .fn_u = { .xts = GLUE_XTS_FUNC_CAST(serpent_xts_enc) } + } } +}; + static const struct common_glue_ctx serpent_dec = { .num_funcs = 2, .fpu_blocks_limit = SERPENT_PARALLEL_BLOCKS, @@ -105,6 +129,19 @@ static const struct common_glue_ctx serpent_dec_cbc = { } } }; +static const struct common_glue_ctx serpent_dec_xts = { + .num_funcs = 2, + .fpu_blocks_limit = SERPENT_PARALLEL_BLOCKS, + + .funcs = { { + .num_blocks = SERPENT_PARALLEL_BLOCKS, + .fn_u = { .xts = GLUE_XTS_FUNC_CAST(serpent_xts_dec_8way_avx) } + }, { + .num_blocks = 1, + .fn_u = { .xts = GLUE_XTS_FUNC_CAST(serpent_xts_dec) } + } } +}; + static int ecb_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst, struct scatterlist *src, unsigned int nbytes) { @@ -299,54 +336,20 @@ static int xts_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst, struct scatterlist *src, unsigned int nbytes) { struct serpent_xts_ctx *ctx = crypto_blkcipher_ctx(desc->tfm); - be128 buf[SERPENT_PARALLEL_BLOCKS]; - struct crypt_priv crypt_ctx = { - .ctx = &ctx->crypt_ctx, - .fpu_enabled = false, - }; - struct xts_crypt_req req = { - .tbuf = buf, - .tbuflen = sizeof(buf), - - .tweak_ctx = &ctx->tweak_ctx, - .tweak_fn = XTS_TWEAK_CAST(__serpent_encrypt), - .crypt_ctx = &crypt_ctx, - .crypt_fn = encrypt_callback, - }; - int ret; - desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP; - ret = xts_crypt(desc, dst, src, nbytes, &req); - serpent_fpu_end(crypt_ctx.fpu_enabled); - - return ret; + return glue_xts_crypt_128bit(&serpent_enc_xts, desc, dst, src, nbytes, + XTS_TWEAK_CAST(__serpent_encrypt), + &ctx->tweak_ctx, &ctx->crypt_ctx); } static int xts_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst, struct scatterlist *src, unsigned int nbytes) { struct serpent_xts_ctx *ctx = crypto_blkcipher_ctx(desc->tfm); - be128 buf[SERPENT_PARALLEL_BLOCKS]; - struct crypt_priv crypt_ctx = { - .ctx = &ctx->crypt_ctx, - .fpu_enabled = false, - }; - struct xts_crypt_req req = { - .tbuf = buf, - .tbuflen = sizeof(buf), - - .tweak_ctx = &ctx->tweak_ctx, - .tweak_fn = XTS_TWEAK_CAST(__serpent_encrypt), - .crypt_ctx = &crypt_ctx, - .crypt_fn = decrypt_callback, - }; - int ret; - desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP; - ret = xts_crypt(desc, dst, src, nbytes, &req); - serpent_fpu_end(crypt_ctx.fpu_enabled); - - return ret; + return glue_xts_crypt_128bit(&serpent_dec_xts, desc, dst, src, nbytes, + XTS_TWEAK_CAST(__serpent_encrypt), + &ctx->tweak_ctx, &ctx->crypt_ctx); } static struct crypto_alg serpent_algs[10] = { { diff --git a/arch/x86/include/asm/crypto/glue_helper.h b/arch/x86/include/asm/crypto/glue_helper.h index e2d65b0..1eef555 100644 --- a/arch/x86/include/asm/crypto/glue_helper.h +++ b/arch/x86/include/asm/crypto/glue_helper.h @@ -14,10 +14,13 @@ typedef void (*common_glue_func_t)(void *ctx, u8 *dst, const u8 *src); typedef void (*common_glue_cbc_func_t)(void *ctx, u128 *dst, const u128 *src); typedef void (*common_glue_ctr_func_t)(void *ctx, u128 *dst, const u128 *src, le128 *iv); +typedef void (*common_glue_xts_func_t)(void *ctx, u128 *dst, const u128 *src, + le128 *iv); #define GLUE_FUNC_CAST(fn) ((common_glue_func_t)(fn)) #define GLUE_CBC_FUNC_CAST(fn) ((common_glue_cbc_func_t)(fn)) #define GLUE_CTR_FUNC_CAST(fn) ((common_glue_ctr_func_t)(fn)) +#define GLUE_XTS_FUNC_CAST(fn) ((common_glue_xts_func_t)(fn)) struct common_glue_func_entry { unsigned int num_blocks; /* number of blocks that @fn will process */ @@ -25,6 +28,7 @@ struct common_glue_func_entry { common_glue_func_t ecb; common_glue_cbc_func_t cbc; common_glue_ctr_func_t ctr; + common_glue_xts_func_t xts; } fn_u; }; @@ -96,6 +100,16 @@ static inline void le128_inc(le128 *i) i->b = cpu_to_le64(b); } +static inline void le128_gf128mul_x_ble(le128 *dst, const le128 *src) +{ + u64 a = le64_to_cpu(src->a); + u64 b = le64_to_cpu(src->b); + u64 _tt = ((s64)a >> 63) & 0x87; + + dst->a = cpu_to_le64((a << 1) ^ (b >> 63)); + dst->b = cpu_to_le64((b << 1) ^ _tt); +} + extern int glue_ecb_crypt_128bit(const struct common_glue_ctx *gctx, struct blkcipher_desc *desc, struct scatterlist *dst, @@ -118,4 +132,14 @@ extern int glue_ctr_crypt_128bit(const struct common_glue_ctx *gctx, struct scatterlist *dst, struct scatterlist *src, unsigned int nbytes); +extern int glue_xts_crypt_128bit(const struct common_glue_ctx *gctx, + struct blkcipher_desc *desc, + struct scatterlist *dst, + struct scatterlist *src, unsigned int nbytes, + common_glue_func_t tweak_fn, void *tweak_ctx, + void *crypt_ctx); + +extern void glue_xts_crypt_128bit_one(void *ctx, u128 *dst, const u128 *src, + le128 *iv, common_glue_func_t fn); + #endif /* _CRYPTO_GLUE_HELPER_H */ diff --git a/arch/x86/include/asm/crypto/serpent-avx.h b/arch/x86/include/asm/crypto/serpent-avx.h index 0da1d3e..56e79cc 100644 --- a/arch/x86/include/asm/crypto/serpent-avx.h +++ b/arch/x86/include/asm/crypto/serpent-avx.h @@ -16,4 +16,9 @@ asmlinkage void serpent_cbc_dec_8way_avx(struct serpent_ctx *ctx, u8 *dst, asmlinkage void serpent_ctr_8way_avx(struct serpent_ctx *ctx, u8 *dst, const u8 *src, le128 *iv); +asmlinkage void serpent_xts_enc_8way_avx(struct serpent_ctx *ctx, u8 *dst, + const u8 *src, le128 *iv); +asmlinkage void serpent_xts_dec_8way_avx(struct serpent_ctx *ctx, u8 *dst, + const u8 *src, le128 *iv); + #endif -- 2.7.4