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Wed, 23 Dec 2020 17:47:53 -0500 X-MC-Unique: PiZiql2QO5CWWlKwlYBW0A-1 Received: by mail.kernel.org (Postfix) with ESMTPSA id C3B88224B2; Wed, 23 Dec 2020 22:39:03 +0000 (UTC) From: Ard Biesheuvel To: linux-crypto@vger.kernel.org Date: Wed, 23 Dec 2020 23:38:33 +0100 Message-Id: <20201223223841.11311-3-ardb@kernel.org> In-Reply-To: <20201223223841.11311-1-ardb@kernel.org> References: <20201223223841.11311-1-ardb@kernel.org> MIME-Version: 1.0 X-Mimecast-Impersonation-Protect: Policy=CLT - Impersonation Protection Definition; Similar Internal Domain=false; Similar Monitored External Domain=false; Custom External Domain=false; Mimecast External Domain=false; Newly Observed Domain=false; Internal User Name=false; Custom Display Name List=false; Reply-to Address Mismatch=false; Targeted Threat Dictionary=false; Mimecast Threat Dictionary=false; Custom Threat Dictionary=false X-Scanned-By: MIMEDefang 2.78 on 10.11.54.3 X-MIME-Autoconverted: from quoted-printable to 8bit by lists01.pubmisc.prod.ext.phx2.redhat.com id 0BNMlwip014941 X-loop: dm-devel@redhat.com X-Mailman-Approved-At: Mon, 04 Jan 2021 14:03:11 -0500 Cc: Herbert Xu , Mike Snitzer , Ard Biesheuvel , Eric Biggers , dm-devel@redhat.com, Milan Broz , Megha Dey Subject: [dm-devel] [RFC PATCH 02/10] crypto: x86/cast6 - switch to XTS template X-BeenThere: dm-devel@redhat.com X-Mailman-Version: 2.1.12 Precedence: junk List-Id: device-mapper development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: dm-devel-bounces@redhat.com Errors-To: dm-devel-bounces@redhat.com X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=dm-devel-bounces@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Now that the XTS template can wrap accelerated ECB modes, it can be used to implement CAST6 in XTS mode as well, which turns out to be at least as fast, and sometimes even faster Signed-off-by: Ard Biesheuvel --- arch/x86/crypto/cast6-avx-x86_64-asm_64.S | 56 ----------- arch/x86/crypto/cast6_avx_glue.c | 98 -------------------- 2 files changed, 154 deletions(-) diff --git a/arch/x86/crypto/cast6-avx-x86_64-asm_64.S b/arch/x86/crypto/cast6-avx-x86_64-asm_64.S index 932a3ce32a88..0c1ea836215a 100644 --- a/arch/x86/crypto/cast6-avx-x86_64-asm_64.S +++ b/arch/x86/crypto/cast6-avx-x86_64-asm_64.S @@ -212,8 +212,6 @@ .section .rodata.cst16, "aM", @progbits, 16 .align 16 -.Lxts_gf128mul_and_shl1_mask: - .byte 0x87, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0 .Lbswap_mask: .byte 3, 2, 1, 0, 7, 6, 5, 4, 11, 10, 9, 8, 15, 14, 13, 12 .Lbswap128_mask: @@ -440,57 +438,3 @@ SYM_FUNC_START(cast6_ctr_8way) FRAME_END ret; SYM_FUNC_END(cast6_ctr_8way) - -SYM_FUNC_START(cast6_xts_enc_8way) - /* input: - * %rdi: ctx, CTX - * %rsi: dst - * %rdx: src - * %rcx: iv (t ⊕ αⁿ ∈ GF(2¹²⁸)) - */ - FRAME_BEGIN - pushq %r15; - - movq %rdi, CTX - movq %rsi, %r11; - - /* regs <= src, dst <= IVs, regs <= regs xor IVs */ - load_xts_8way(%rcx, %rdx, %rsi, RA1, RB1, RC1, RD1, RA2, RB2, RC2, RD2, - RX, RKR, RKM, .Lxts_gf128mul_and_shl1_mask); - - call __cast6_enc_blk8; - - /* dst <= regs xor IVs(in dst) */ - store_xts_8way(%r11, RA1, RB1, RC1, RD1, RA2, RB2, RC2, RD2); - - popq %r15; - FRAME_END - ret; -SYM_FUNC_END(cast6_xts_enc_8way) - -SYM_FUNC_START(cast6_xts_dec_8way) - /* input: - * %rdi: ctx, CTX - * %rsi: dst - * %rdx: src - * %rcx: iv (t ⊕ αⁿ ∈ GF(2¹²⁸)) - */ - FRAME_BEGIN - pushq %r15; - - movq %rdi, CTX - movq %rsi, %r11; - - /* regs <= src, dst <= IVs, regs <= regs xor IVs */ - load_xts_8way(%rcx, %rdx, %rsi, RA1, RB1, RC1, RD1, RA2, RB2, RC2, RD2, - RX, RKR, RKM, .Lxts_gf128mul_and_shl1_mask); - - call __cast6_dec_blk8; - - /* dst <= regs xor IVs(in dst) */ - store_xts_8way(%r11, RA1, RB1, RC1, RD1, RA2, RB2, RC2, RD2); - - popq %r15; - FRAME_END - ret; -SYM_FUNC_END(cast6_xts_dec_8way) diff --git a/arch/x86/crypto/cast6_avx_glue.c b/arch/x86/crypto/cast6_avx_glue.c index 48e0f37796fa..5a21d3e9041c 100644 --- a/arch/x86/crypto/cast6_avx_glue.c +++ b/arch/x86/crypto/cast6_avx_glue.c @@ -15,7 +15,6 @@ #include #include #include -#include #include #define CAST6_PARALLEL_BLOCKS 8 @@ -27,27 +26,12 @@ asmlinkage void cast6_cbc_dec_8way(const void *ctx, u8 *dst, const u8 *src); asmlinkage void cast6_ctr_8way(const void *ctx, u8 *dst, const u8 *src, le128 *iv); -asmlinkage void cast6_xts_enc_8way(const void *ctx, u8 *dst, const u8 *src, - le128 *iv); -asmlinkage void cast6_xts_dec_8way(const void *ctx, u8 *dst, const u8 *src, - le128 *iv); - static int cast6_setkey_skcipher(struct crypto_skcipher *tfm, const u8 *key, unsigned int keylen) { return cast6_setkey(&tfm->base, key, keylen); } -static void cast6_xts_enc(const void *ctx, u8 *dst, const u8 *src, le128 *iv) -{ - glue_xts_crypt_128bit_one(ctx, dst, src, iv, __cast6_encrypt); -} - -static void cast6_xts_dec(const void *ctx, u8 *dst, const u8 *src, le128 *iv) -{ - glue_xts_crypt_128bit_one(ctx, dst, src, iv, __cast6_decrypt); -} - static void cast6_crypt_ctr(const void *ctx, u8 *d, const u8 *s, le128 *iv) { be128 ctrblk; @@ -87,19 +71,6 @@ static const struct common_glue_ctx cast6_ctr = { } } }; -static const struct common_glue_ctx cast6_enc_xts = { - .num_funcs = 2, - .fpu_blocks_limit = CAST6_PARALLEL_BLOCKS, - - .funcs = { { - .num_blocks = CAST6_PARALLEL_BLOCKS, - .fn_u = { .xts = cast6_xts_enc_8way } - }, { - .num_blocks = 1, - .fn_u = { .xts = cast6_xts_enc } - } } -}; - static const struct common_glue_ctx cast6_dec = { .num_funcs = 2, .fpu_blocks_limit = CAST6_PARALLEL_BLOCKS, @@ -126,19 +97,6 @@ static const struct common_glue_ctx cast6_dec_cbc = { } } }; -static const struct common_glue_ctx cast6_dec_xts = { - .num_funcs = 2, - .fpu_blocks_limit = CAST6_PARALLEL_BLOCKS, - - .funcs = { { - .num_blocks = CAST6_PARALLEL_BLOCKS, - .fn_u = { .xts = cast6_xts_dec_8way } - }, { - .num_blocks = 1, - .fn_u = { .xts = cast6_xts_dec } - } } -}; - static int ecb_encrypt(struct skcipher_request *req) { return glue_ecb_req_128bit(&cast6_enc, req); @@ -164,48 +122,6 @@ static int ctr_crypt(struct skcipher_request *req) return glue_ctr_req_128bit(&cast6_ctr, req); } -struct cast6_xts_ctx { - struct cast6_ctx tweak_ctx; - struct cast6_ctx crypt_ctx; -}; - -static int xts_cast6_setkey(struct crypto_skcipher *tfm, const u8 *key, - unsigned int keylen) -{ - struct cast6_xts_ctx *ctx = crypto_skcipher_ctx(tfm); - int err; - - err = xts_verify_key(tfm, key, keylen); - if (err) - return err; - - /* first half of xts-key is for crypt */ - err = __cast6_setkey(&ctx->crypt_ctx, key, keylen / 2); - if (err) - return err; - - /* second half of xts-key is for tweak */ - return __cast6_setkey(&ctx->tweak_ctx, key + keylen / 2, keylen / 2); -} - -static int xts_encrypt(struct skcipher_request *req) -{ - struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); - struct cast6_xts_ctx *ctx = crypto_skcipher_ctx(tfm); - - return glue_xts_req_128bit(&cast6_enc_xts, req, __cast6_encrypt, - &ctx->tweak_ctx, &ctx->crypt_ctx, false); -} - -static int xts_decrypt(struct skcipher_request *req) -{ - struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); - struct cast6_xts_ctx *ctx = crypto_skcipher_ctx(tfm); - - return glue_xts_req_128bit(&cast6_dec_xts, req, __cast6_encrypt, - &ctx->tweak_ctx, &ctx->crypt_ctx, true); -} - static struct skcipher_alg cast6_algs[] = { { .base.cra_name = "__ecb(cast6)", @@ -249,20 +165,6 @@ static struct skcipher_alg cast6_algs[] = { .setkey = cast6_setkey_skcipher, .encrypt = ctr_crypt, .decrypt = ctr_crypt, - }, { - .base.cra_name = "__xts(cast6)", - .base.cra_driver_name = "__xts-cast6-avx", - .base.cra_priority = 200, - .base.cra_flags = CRYPTO_ALG_INTERNAL, - .base.cra_blocksize = CAST6_BLOCK_SIZE, - .base.cra_ctxsize = sizeof(struct cast6_xts_ctx), - .base.cra_module = THIS_MODULE, - .min_keysize = 2 * CAST6_MIN_KEY_SIZE, - .max_keysize = 2 * CAST6_MAX_KEY_SIZE, - .ivsize = CAST6_BLOCK_SIZE, - .setkey = xts_cast6_setkey, - .encrypt = xts_encrypt, - .decrypt = xts_decrypt, }, };