From patchwork Thu Oct 18 14:56:53 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Jason A. Donenfeld" X-Patchwork-Id: 10647399 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 41A7A109C for ; Thu, 18 Oct 2018 15:01:30 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 3050228DE8 for ; Thu, 18 Oct 2018 15:01:30 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 2DF8728DC1; Thu, 18 Oct 2018 15:01:30 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.3 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from mother.openwall.net (mother.openwall.net [195.42.179.200]) by mail.wl.linuxfoundation.org (Postfix) with SMTP id A65A828DDD for ; Thu, 18 Oct 2018 15:01:27 +0000 (UTC) Received: (qmail 28536 invoked by uid 550); 18 Oct 2018 14:58:04 -0000 Mailing-List: contact kernel-hardening-help@lists.openwall.com; run by ezmlm Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-ID: Delivered-To: mailing list kernel-hardening@lists.openwall.com Received: (qmail 28383 invoked from network); 18 Oct 2018 14:58:04 -0000 DKIM-Signature: v=1; a=rsa-sha1; c=relaxed; d=zx2c4.com; h=from:to:cc :subject:date:message-id:in-reply-to:references:mime-version :content-transfer-encoding; s=mail; bh=l8Flp5D7keF9sPfGmnlaNOXR5 9Y=; b=t6se342iDemMW+Y+8F/gUcqwDsRsKhatgCm1kOhIS39EQ/BJyyf77CZr0 ZiERMZXScwxGkglmsBTb6d6ps7fQOf29FhgoIP5XL63yg5SfKhHOITERDVByPe6H xFq7CTC8FRHItlDRYfSyRDon0cYOzCQdRoxO838gMtxX+id6qWns28oeV7ErbhnI s+PUOj8SjBaGX1wweKXCYbjzBKb88Ol2NQgPDyDiMq0BfFfsR6/RoYy8NseMlRn6 i07OFDAN9RMGlXUZdXlMY8isS4n0MBboFRZTEZQewJEAuXLPfDcHmRi6q2gdCWqx kCCgNfIGpe/r3v4BY24FqfdAf8J7A== From: "Jason A. Donenfeld" To: linux-kernel@vger.kernel.org, netdev@vger.kernel.org, linux-crypto@vger.kernel.org, davem@davemloft.net, gregkh@linuxfoundation.org Cc: "Jason A. Donenfeld" , Russell King , linux-arm-kernel@lists.infradead.org, Samuel Neves , Jean-Philippe Aumasson , Andy Lutomirski , Andrew Morton , Linus Torvalds , kernel-hardening@lists.openwall.com Subject: [PATCH net-next v8 09/28] zinc: ChaCha20 ARM and ARM64 implementations Date: Thu, 18 Oct 2018 16:56:53 +0200 Message-Id: <20181018145712.7538-10-Jason@zx2c4.com> In-Reply-To: <20181018145712.7538-1-Jason@zx2c4.com> References: <20181018145712.7538-1-Jason@zx2c4.com> MIME-Version: 1.0 X-Virus-Scanned: ClamAV using ClamSMTP These wire Andy Polyakov's implementations up to the kernel for ARMv7,8 NEON, and introduce Eric Biggers' ultra-fast scalar implementation for CPUs without NEON or for CPUs with slow NEON (Cortex-A5,7). This commit does the following: - Adds the glue code for the assembly implementations. - Renames the ARMv8 code into place, since it can at this point be used wholesale. - Merges Andy Polyakov's ARMv7 NEON code with Eric Biggers' <=ARMv7 scalar code. This commit delivers approximately the same or much better performance than the existing crypto API's code and has been measured to do as such on: - ARM1176JZF-S [ARMv6] - Cortex-A7 [ARMv7] - Cortex-A8 [ARMv7] - Cortex-A9 [ARMv7] - Cortex-A17 [ARMv7] - Cortex-A53 [ARMv8] - Cortex-A55 [ARMv8] - Cortex-A73 [ARMv8] - Cortex-A75 [ARMv8] Interestingly, Andy Polyakov's scalar code is slower than Eric Biggers', but is also significantly shorter. This has the advantage that it does not evict other code from L1 cache -- particularly on ARM11 chips -- and so in certain circumstances it can actually be faster. However, it wasn't found that this had an affect on any code existing in the kernel today. Signed-off-by: Jason A. Donenfeld Co-authored-by: Eric Biggers Cc: Russell King Cc: linux-arm-kernel@lists.infradead.org Cc: Samuel Neves Cc: Jean-Philippe Aumasson Cc: Andy Lutomirski Cc: Greg KH Cc: Andrew Morton Cc: Linus Torvalds Cc: kernel-hardening@lists.openwall.com Cc: linux-crypto@vger.kernel.org --- Notes: Eric Biggers' scalar code is brand new, and quite possibly prematurely added to this commit, and so it may require a bit of revision. In initial evaluation and fuzzing so far, it seems fine. But we'll be looking at this a bit more as well. lib/zinc/Makefile | 2 + lib/zinc/chacha20/chacha20-arm-glue.c | 98 ++++ ...acha20-arm-cryptogams.S => chacha20-arm.S} | 503 ++++++++++++++++-- ...20-arm64-cryptogams.S => chacha20-arm64.S} | 0 lib/zinc/chacha20/chacha20.c | 2 + 5 files changed, 567 insertions(+), 38 deletions(-) create mode 100644 lib/zinc/chacha20/chacha20-arm-glue.c rename lib/zinc/chacha20/{chacha20-arm-cryptogams.S => chacha20-arm.S} (71%) rename lib/zinc/chacha20/{chacha20-arm64-cryptogams.S => chacha20-arm64.S} (100%) diff --git a/lib/zinc/Makefile b/lib/zinc/Makefile index 223a0816c918..e47f64e12bbd 100644 --- a/lib/zinc/Makefile +++ b/lib/zinc/Makefile @@ -4,4 +4,6 @@ ccflags-$(CONFIG_ZINC_DEBUG) += -DDEBUG zinc_chacha20-y := chacha20/chacha20.o zinc_chacha20-$(CONFIG_ZINC_ARCH_X86_64) += chacha20/chacha20-x86_64.o +zinc_chacha20-$(CONFIG_ZINC_ARCH_ARM) += chacha20/chacha20-arm.o +zinc_chacha20-$(CONFIG_ZINC_ARCH_ARM64) += chacha20/chacha20-arm64.o obj-$(CONFIG_ZINC_CHACHA20) += zinc_chacha20.o diff --git a/lib/zinc/chacha20/chacha20-arm-glue.c b/lib/zinc/chacha20/chacha20-arm-glue.c new file mode 100644 index 000000000000..a0da95d3b9c4 --- /dev/null +++ b/lib/zinc/chacha20/chacha20-arm-glue.c @@ -0,0 +1,98 @@ +// SPDX-License-Identifier: GPL-2.0 OR MIT +/* + * Copyright (C) 2015-2018 Jason A. Donenfeld . All Rights Reserved. + */ + +#include +#include +#if defined(CONFIG_ZINC_ARCH_ARM) +#include +#include +#endif + +asmlinkage void chacha20_arm(u8 *out, const u8 *in, const size_t len, + const u32 key[8], const u32 counter[4]); +asmlinkage void hchacha20_arm(const u32 state[16], u32 out[8]); +asmlinkage void chacha20_neon(u8 *out, const u8 *in, const size_t len, + const u32 key[8], const u32 counter[4]); + +static bool chacha20_use_neon __ro_after_init; +static bool *const chacha20_nobs[] __initconst = { &chacha20_use_neon }; +static void __init chacha20_fpu_init(void) +{ +#if defined(CONFIG_ZINC_ARCH_ARM64) + chacha20_use_neon = elf_hwcap & HWCAP_ASIMD; +#elif defined(CONFIG_ZINC_ARCH_ARM) + switch (read_cpuid_part()) { + case ARM_CPU_PART_CORTEX_A7: + case ARM_CPU_PART_CORTEX_A5: + /* The Cortex-A7 and Cortex-A5 do not perform well with the NEON + * implementation but do incredibly with the scalar one and use + * less power. + */ + break; + default: + chacha20_use_neon = elf_hwcap & HWCAP_NEON; + } +#endif +} + +static inline bool chacha20_arch(struct chacha20_ctx *ctx, u8 *dst, + const u8 *src, size_t len, + simd_context_t *simd_context) +{ + /* SIMD disables preemption, so relax after processing each page. */ + BUILD_BUG_ON(PAGE_SIZE < CHACHA20_BLOCK_SIZE || + PAGE_SIZE % CHACHA20_BLOCK_SIZE); + + for (;;) { + if (IS_ENABLED(CONFIG_KERNEL_MODE_NEON) && chacha20_use_neon && + len >= CHACHA20_BLOCK_SIZE * 3 && simd_use(simd_context)) { + const size_t bytes = min_t(size_t, len, PAGE_SIZE); + + chacha20_neon(dst, src, bytes, ctx->key, ctx->counter); + ctx->counter[0] += (bytes + 63) / 64; + len -= bytes; + if (!len) + break; + dst += bytes; + src += bytes; + simd_relax(simd_context); + } else { + chacha20_arm(dst, src, len, ctx->key, ctx->counter); + ctx->counter[0] += (len + 63) / 64; + break; + } + } + + return true; +} + +static inline bool hchacha20_arch(u32 derived_key[CHACHA20_KEY_WORDS], + const u8 nonce[HCHACHA20_NONCE_SIZE], + const u8 key[HCHACHA20_KEY_SIZE], + simd_context_t *simd_context) +{ + if (IS_ENABLED(CONFIG_ZINC_ARCH_ARM)) { + u32 x[] = { CHACHA20_CONSTANT_EXPA, + CHACHA20_CONSTANT_ND_3, + CHACHA20_CONSTANT_2_BY, + CHACHA20_CONSTANT_TE_K, + get_unaligned_le32(key + 0), + get_unaligned_le32(key + 4), + get_unaligned_le32(key + 8), + get_unaligned_le32(key + 12), + get_unaligned_le32(key + 16), + get_unaligned_le32(key + 20), + get_unaligned_le32(key + 24), + get_unaligned_le32(key + 28), + get_unaligned_le32(nonce + 0), + get_unaligned_le32(nonce + 4), + get_unaligned_le32(nonce + 8), + get_unaligned_le32(nonce + 12) + }; + hchacha20_arm(x, derived_key); + return true; + } + return false; +} diff --git a/lib/zinc/chacha20/chacha20-arm-cryptogams.S b/lib/zinc/chacha20/chacha20-arm.S similarity index 71% rename from lib/zinc/chacha20/chacha20-arm-cryptogams.S rename to lib/zinc/chacha20/chacha20-arm.S index 770bab469171..79ed18fbcce3 100644 --- a/lib/zinc/chacha20/chacha20-arm-cryptogams.S +++ b/lib/zinc/chacha20/chacha20-arm.S @@ -1,12 +1,475 @@ /* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause */ /* + * Copyright (C) 2018 Google, Inc. * Copyright (C) 2015-2018 Jason A. Donenfeld . All Rights Reserved. * Copyright (C) 2006-2017 CRYPTOGAMS by . All Rights Reserved. - * - * This is based in part on Andy Polyakov's implementation from CRYPTOGAMS. */ #include +#include + +/* + * The following scalar routine was written by Eric Biggers. + * + * Design notes: + * + * 16 registers would be needed to hold the state matrix, but only 14 are + * available because 'sp' and 'pc' cannot be used. So we spill the elements + * (x8, x9) to the stack and swap them out with (x10, x11). This adds one + * 'ldrd' and one 'strd' instruction per round. + * + * All rotates are performed using the implicit rotate operand accepted by the + * 'add' and 'eor' instructions. This is faster than using explicit rotate + * instructions. To make this work, we allow the values in the second and last + * rows of the ChaCha state matrix (rows 'b' and 'd') to temporarily have the + * wrong rotation amount. The rotation amount is then fixed up just in time + * when the values are used. 'brot' is the number of bits the values in row 'b' + * need to be rotated right to arrive at the correct values, and 'drot' + * similarly for row 'd'. (brot, drot) start out as (0, 0) but we make it such + * that they end up as (25, 24) after every round. + */ + + // ChaCha state registers + X0 .req r0 + X1 .req r1 + X2 .req r2 + X3 .req r3 + X4 .req r4 + X5 .req r5 + X6 .req r6 + X7 .req r7 + X8_X10 .req r8 // shared by x8 and x10 + X9_X11 .req r9 // shared by x9 and x11 + X12 .req r10 + X13 .req r11 + X14 .req r12 + X15 .req r14 + +.Lexpand_32byte_k: + // "expand 32-byte k" + .word 0x61707865, 0x3320646e, 0x79622d32, 0x6b206574 + +#ifdef __thumb2__ +# define adrl adr +#endif + +.macro __rev out, in, t0, t1, t2 +.if __LINUX_ARM_ARCH__ >= 6 + rev \out, \in +.else + lsl \t0, \in, #24 + and \t1, \in, #0xff00 + and \t2, \in, #0xff0000 + orr \out, \t0, \in, lsr #24 + orr \out, \out, \t1, lsl #8 + orr \out, \out, \t2, lsr #8 +.endif +.endm + +.macro _le32_bswap x, t0, t1, t2 +#ifdef __ARMEB__ + __rev \x, \x, \t0, \t1, \t2 +#endif +.endm + +.macro _le32_bswap_4x a, b, c, d, t0, t1, t2 + _le32_bswap \a, \t0, \t1, \t2 + _le32_bswap \b, \t0, \t1, \t2 + _le32_bswap \c, \t0, \t1, \t2 + _le32_bswap \d, \t0, \t1, \t2 +.endm + +.macro __ldrd a, b, src, offset +#if __LINUX_ARM_ARCH__ >= 6 + ldrd \a, \b, [\src, #\offset] +#else + ldr \a, [\src, #\offset] + ldr \b, [\src, #\offset + 4] +#endif +.endm + +.macro __strd a, b, dst, offset +#if __LINUX_ARM_ARCH__ >= 6 + strd \a, \b, [\dst, #\offset] +#else + str \a, [\dst, #\offset] + str \b, [\dst, #\offset + 4] +#endif +.endm + +.macro _halfround a1, b1, c1, d1, a2, b2, c2, d2 + + // a += b; d ^= a; d = rol(d, 16); + add \a1, \a1, \b1, ror #brot + add \a2, \a2, \b2, ror #brot + eor \d1, \a1, \d1, ror #drot + eor \d2, \a2, \d2, ror #drot + // drot == 32 - 16 == 16 + + // c += d; b ^= c; b = rol(b, 12); + add \c1, \c1, \d1, ror #16 + add \c2, \c2, \d2, ror #16 + eor \b1, \c1, \b1, ror #brot + eor \b2, \c2, \b2, ror #brot + // brot == 32 - 12 == 20 + + // a += b; d ^= a; d = rol(d, 8); + add \a1, \a1, \b1, ror #20 + add \a2, \a2, \b2, ror #20 + eor \d1, \a1, \d1, ror #16 + eor \d2, \a2, \d2, ror #16 + // drot == 32 - 8 == 24 + + // c += d; b ^= c; b = rol(b, 7); + add \c1, \c1, \d1, ror #24 + add \c2, \c2, \d2, ror #24 + eor \b1, \c1, \b1, ror #20 + eor \b2, \c2, \b2, ror #20 + // brot == 32 - 7 == 25 +.endm + +.macro _doubleround + + // column round + + // quarterrounds: (x0, x4, x8, x12) and (x1, x5, x9, x13) + _halfround X0, X4, X8_X10, X12, X1, X5, X9_X11, X13 + + // save (x8, x9); restore (x10, x11) + __strd X8_X10, X9_X11, sp, 0 + __ldrd X8_X10, X9_X11, sp, 8 + + // quarterrounds: (x2, x6, x10, x14) and (x3, x7, x11, x15) + _halfround X2, X6, X8_X10, X14, X3, X7, X9_X11, X15 + + .set brot, 25 + .set drot, 24 + + // diagonal round + + // quarterrounds: (x0, x5, x10, x15) and (x1, x6, x11, x12) + _halfround X0, X5, X8_X10, X15, X1, X6, X9_X11, X12 + + // save (x10, x11); restore (x8, x9) + __strd X8_X10, X9_X11, sp, 8 + __ldrd X8_X10, X9_X11, sp, 0 + + // quarterrounds: (x2, x7, x8, x13) and (x3, x4, x9, x14) + _halfround X2, X7, X8_X10, X13, X3, X4, X9_X11, X14 +.endm + +.macro _chacha_permute nrounds + .set brot, 0 + .set drot, 0 + .rept \nrounds / 2 + _doubleround + .endr +.endm + +.macro _chacha nrounds + +.Lnext_block\@: + // Stack: unused0-unused1 x10-x11 x0-x15 OUT IN LEN + // Registers contain x0-x9,x12-x15. + + // Do the core ChaCha permutation to update x0-x15. + _chacha_permute \nrounds + + add sp, #8 + // Stack: x10-x11 orig_x0-orig_x15 OUT IN LEN + // Registers contain x0-x9,x12-x15. + // x4-x7 are rotated by 'brot'; x12-x15 are rotated by 'drot'. + + // Free up some registers (r8-r12,r14) by pushing (x8-x9,x12-x15). + push {X8_X10, X9_X11, X12, X13, X14, X15} + + // Load (OUT, IN, LEN). + ldr r14, [sp, #96] + ldr r12, [sp, #100] + ldr r11, [sp, #104] + + orr r10, r14, r12 + + // Use slow path if fewer than 64 bytes remain. + cmp r11, #64 + blt .Lxor_slowpath\@ + + // Use slow path if IN and/or OUT isn't 4-byte aligned. Needed even on + // ARMv6+, since ldmia and stmia (used below) still require alignment. + tst r10, #3 + bne .Lxor_slowpath\@ + + // Fast path: XOR 64 bytes of aligned data. + + // Stack: x8-x9 x12-x15 x10-x11 orig_x0-orig_x15 OUT IN LEN + // Registers: r0-r7 are x0-x7; r8-r11 are free; r12 is IN; r14 is OUT. + // x4-x7 are rotated by 'brot'; x12-x15 are rotated by 'drot'. + + // x0-x3 + __ldrd r8, r9, sp, 32 + __ldrd r10, r11, sp, 40 + add X0, X0, r8 + add X1, X1, r9 + add X2, X2, r10 + add X3, X3, r11 + _le32_bswap_4x X0, X1, X2, X3, r8, r9, r10 + ldmia r12!, {r8-r11} + eor X0, X0, r8 + eor X1, X1, r9 + eor X2, X2, r10 + eor X3, X3, r11 + stmia r14!, {X0-X3} + + // x4-x7 + __ldrd r8, r9, sp, 48 + __ldrd r10, r11, sp, 56 + add X4, r8, X4, ror #brot + add X5, r9, X5, ror #brot + ldmia r12!, {X0-X3} + add X6, r10, X6, ror #brot + add X7, r11, X7, ror #brot + _le32_bswap_4x X4, X5, X6, X7, r8, r9, r10 + eor X4, X4, X0 + eor X5, X5, X1 + eor X6, X6, X2 + eor X7, X7, X3 + stmia r14!, {X4-X7} + + // x8-x15 + pop {r0-r7} // (x8-x9,x12-x15,x10-x11) + __ldrd r8, r9, sp, 32 + __ldrd r10, r11, sp, 40 + add r0, r0, r8 // x8 + add r1, r1, r9 // x9 + add r6, r6, r10 // x10 + add r7, r7, r11 // x11 + _le32_bswap_4x r0, r1, r6, r7, r8, r9, r10 + ldmia r12!, {r8-r11} + eor r0, r0, r8 // x8 + eor r1, r1, r9 // x9 + eor r6, r6, r10 // x10 + eor r7, r7, r11 // x11 + stmia r14!, {r0,r1,r6,r7} + ldmia r12!, {r0,r1,r6,r7} + __ldrd r8, r9, sp, 48 + __ldrd r10, r11, sp, 56 + add r2, r8, r2, ror #drot // x12 + add r3, r9, r3, ror #drot // x13 + add r4, r10, r4, ror #drot // x14 + add r5, r11, r5, ror #drot // x15 + _le32_bswap_4x r2, r3, r4, r5, r9, r10, r11 + ldr r9, [sp, #72] // load LEN + eor r2, r2, r0 // x12 + eor r3, r3, r1 // x13 + eor r4, r4, r6 // x14 + eor r5, r5, r7 // x15 + subs r9, #64 // decrement and check LEN + stmia r14!, {r2-r5} + + beq .Ldone\@ + +.Lprepare_for_next_block\@: + + // Stack: x0-x15 OUT IN LEN + + // Increment block counter (x12) + add r8, #1 + + // Store updated (OUT, IN, LEN) + str r14, [sp, #64] + str r12, [sp, #68] + str r9, [sp, #72] + + mov r14, sp + + // Store updated block counter (x12) + str r8, [sp, #48] + + sub sp, #16 + + // Reload state and do next block + ldmia r14!, {r0-r11} // load x0-x11 + __strd r10, r11, sp, 8 // store x10-x11 before state + ldmia r14, {r10-r12,r14} // load x12-x15 + b .Lnext_block\@ + +.Lxor_slowpath\@: + // Slow path: < 64 bytes remaining, or unaligned input or output buffer. + // We handle it by storing the 64 bytes of keystream to the stack, then + // XOR-ing the needed portion with the data. + + // Allocate keystream buffer + sub sp, #64 + mov r14, sp + + // Stack: ks0-ks15 x8-x9 x12-x15 x10-x11 orig_x0-orig_x15 OUT IN LEN + // Registers: r0-r7 are x0-x7; r8-r11 are free; r12 is IN; r14 is &ks0. + // x4-x7 are rotated by 'brot'; x12-x15 are rotated by 'drot'. + + // Save keystream for x0-x3 + __ldrd r8, r9, sp, 96 + __ldrd r10, r11, sp, 104 + add X0, X0, r8 + add X1, X1, r9 + add X2, X2, r10 + add X3, X3, r11 + _le32_bswap_4x X0, X1, X2, X3, r8, r9, r10 + stmia r14!, {X0-X3} + + // Save keystream for x4-x7 + __ldrd r8, r9, sp, 112 + __ldrd r10, r11, sp, 120 + add X4, r8, X4, ror #brot + add X5, r9, X5, ror #brot + add X6, r10, X6, ror #brot + add X7, r11, X7, ror #brot + _le32_bswap_4x X4, X5, X6, X7, r8, r9, r10 + add r8, sp, #64 + stmia r14!, {X4-X7} + + // Save keystream for x8-x15 + ldm r8, {r0-r7} // (x8-x9,x12-x15,x10-x11) + __ldrd r8, r9, sp, 128 + __ldrd r10, r11, sp, 136 + add r0, r0, r8 // x8 + add r1, r1, r9 // x9 + add r6, r6, r10 // x10 + add r7, r7, r11 // x11 + _le32_bswap_4x r0, r1, r6, r7, r8, r9, r10 + stmia r14!, {r0,r1,r6,r7} + __ldrd r8, r9, sp, 144 + __ldrd r10, r11, sp, 152 + add r2, r8, r2, ror #drot // x12 + add r3, r9, r3, ror #drot // x13 + add r4, r10, r4, ror #drot // x14 + add r5, r11, r5, ror #drot // x15 + _le32_bswap_4x r2, r3, r4, r5, r9, r10, r11 + stmia r14, {r2-r5} + + // Stack: ks0-ks15 unused0-unused7 x0-x15 OUT IN LEN + // Registers: r8 is block counter, r12 is IN. + + ldr r9, [sp, #168] // LEN + ldr r14, [sp, #160] // OUT + cmp r9, #64 + mov r0, sp + movle r1, r9 + movgt r1, #64 + // r1 is number of bytes to XOR, in range [1, 64] + +.if __LINUX_ARM_ARCH__ < 6 + orr r2, r12, r14 + tst r2, #3 // IN or OUT misaligned? + bne .Lxor_next_byte\@ +.endif + + // XOR a word at a time +.rept 16 + subs r1, #4 + blt .Lxor_words_done\@ + ldr r2, [r12], #4 + ldr r3, [r0], #4 + eor r2, r2, r3 + str r2, [r14], #4 +.endr + b .Lxor_slowpath_done\@ +.Lxor_words_done\@: + ands r1, r1, #3 + beq .Lxor_slowpath_done\@ + + // XOR a byte at a time +.Lxor_next_byte\@: + ldrb r2, [r12], #1 + ldrb r3, [r0], #1 + eor r2, r2, r3 + strb r2, [r14], #1 + subs r1, #1 + bne .Lxor_next_byte\@ + +.Lxor_slowpath_done\@: + subs r9, #64 + add sp, #96 + bgt .Lprepare_for_next_block\@ + +.Ldone\@: +.endm // _chacha + +/* + * void chacha20_arm(u8 *out, const u8 *in, size_t len, const u32 key[8], + * const u32 iv[4]); + */ +ENTRY(chacha20_arm) + cmp r2, #0 // len == 0? + reteq lr + + push {r0-r2,r4-r11,lr} + + // Push state x0-x15 onto stack. + // Also store an extra copy of x10-x11 just before the state. + + ldr r4, [sp, #48] // iv + mov r0, sp + sub sp, #80 + + // iv: x12-x15 + ldm r4, {X12,X13,X14,X15} + stmdb r0!, {X12,X13,X14,X15} + + // key: x4-x11 + __ldrd X8_X10, X9_X11, r3, 24 + __strd X8_X10, X9_X11, sp, 8 + stmdb r0!, {X8_X10, X9_X11} + ldm r3, {X4-X9_X11} + stmdb r0!, {X4-X9_X11} + + // constants: x0-x3 + adrl X3, .Lexpand_32byte_k + ldm X3, {X0-X3} + __strd X0, X1, sp, 16 + __strd X2, X3, sp, 24 + + _chacha 20 + + add sp, #76 + pop {r4-r11, pc} +ENDPROC(chacha20_arm) + +/* + * void hchacha20_arm(const u32 state[16], u32 out[8]); + */ +ENTRY(hchacha20_arm) + push {r1,r4-r11,lr} + + mov r14, r0 + ldmia r14!, {r0-r11} // load x0-x11 + push {r10-r11} // store x10-x11 to stack + ldm r14, {r10-r12,r14} // load x12-x15 + sub sp, #8 + + _chacha_permute 20 + + // Skip over (unused0-unused1, x10-x11) + add sp, #16 + + // Fix up rotations of x12-x15 + ror X12, X12, #drot + ror X13, X13, #drot + pop {r4} // load 'out' + ror X14, X14, #drot + ror X15, X15, #drot + + // Store (x0-x3,x12-x15) to 'out' + stm r4, {X0,X1,X2,X3,X12,X13,X14,X15} + + pop {r4-r11,pc} +ENDPROC(hchacha20_arm) + +#ifdef CONFIG_KERNEL_MODE_NEON +/* + * This following NEON routine was ported from Andy Polyakov's implementation + * from CRYPTOGAMS. It begins with parts of the CRYPTOGAMS scalar routine, + * since certain NEON code paths actually branch to it. + */ .text #if defined(__thumb2__) || defined(__clang__) @@ -22,39 +485,6 @@ #define ldrhsb ldrbhs #endif -.align 5 -.Lsigma: -.long 0x61707865,0x3320646e,0x79622d32,0x6b206574 @ endian-neutral -.Lone: -.long 1,0,0,0 -.word -1 - -.align 5 -ENTRY(chacha20_arm) - ldr r12,[sp,#0] @ pull pointer to counter and nonce - stmdb sp!,{r0-r2,r4-r11,lr} - cmp r2,#0 @ len==0? -#ifdef __thumb2__ - itt eq -#endif - addeq sp,sp,#4*3 - beq .Lno_data_arm - ldmia r12,{r4-r7} @ load counter and nonce - sub sp,sp,#4*(16) @ off-load area -#if __LINUX_ARM_ARCH__ < 7 && !defined(__thumb2__) - sub r14,pc,#100 @ .Lsigma -#else - adr r14,.Lsigma @ .Lsigma -#endif - stmdb sp!,{r4-r7} @ copy counter and nonce - ldmia r3,{r4-r11} @ load key - ldmia r14,{r0-r3} @ load sigma - stmdb sp!,{r4-r11} @ copy key - stmdb sp!,{r0-r3} @ copy sigma - str r10,[sp,#4*(16+10)] @ off-load "rx" - str r11,[sp,#4*(16+11)] @ off-load "rx" - b .Loop_outer_enter - .align 4 .Loop_outer: ldmia sp,{r0-r9} @ load key material @@ -748,11 +1178,8 @@ ENTRY(chacha20_arm) .Ldone: add sp,sp,#4*(32+3) -.Lno_data_arm: ldmia sp!,{r4-r11,pc} -ENDPROC(chacha20_arm) -#ifdef CONFIG_KERNEL_MODE_NEON .align 5 .Lsigma2: .long 0x61707865,0x3320646e,0x79622d32,0x6b206574 @ endian-neutral diff --git a/lib/zinc/chacha20/chacha20-arm64-cryptogams.S b/lib/zinc/chacha20/chacha20-arm64.S similarity index 100% rename from lib/zinc/chacha20/chacha20-arm64-cryptogams.S rename to lib/zinc/chacha20/chacha20-arm64.S diff --git a/lib/zinc/chacha20/chacha20.c b/lib/zinc/chacha20/chacha20.c index 22a21431c221..3698fcd8ae7f 100644 --- a/lib/zinc/chacha20/chacha20.c +++ b/lib/zinc/chacha20/chacha20.c @@ -18,6 +18,8 @@ #if defined(CONFIG_ZINC_ARCH_X86_64) #include "chacha20-x86_64-glue.c" +#elif defined(CONFIG_ZINC_ARCH_ARM) || defined(CONFIG_ZINC_ARCH_ARM64) +#include "chacha20-arm-glue.c" #else static bool *const chacha20_nobs[] __initconst = { }; static void __init chacha20_fpu_init(void)