[PATCH 4/5] crypto/arm64: sha3 - new implementation based on special instructions
Ard Biesheuvel
ard.biesheuvel at linaro.org
Fri Jan 12 05:15:21 PST 2018
Implement the various flavours of SHA3 using the new optional
EOR3/RAX1/XAR/BCAX instructions introduced by ARMv8.2.
Signed-off-by: Ard Biesheuvel <ard.biesheuvel at linaro.org>
---
arch/arm64/crypto/Kconfig | 6 +
arch/arm64/crypto/Makefile | 3 +
arch/arm64/crypto/sha3-ce-core.S | 224 ++++++++++++++++++++
arch/arm64/crypto/sha3-ce-glue.c | 156 ++++++++++++++
4 files changed, 389 insertions(+)
diff --git a/arch/arm64/crypto/Kconfig b/arch/arm64/crypto/Kconfig
index aad288f4b9de..4f2974687606 100644
--- a/arch/arm64/crypto/Kconfig
+++ b/arch/arm64/crypto/Kconfig
@@ -35,6 +35,12 @@ config CRYPTO_SHA512_ARM64_CE
select CRYPTO_HASH
select CRYPTO_SHA512_ARM64
+config CRYPTO_SHA3_ARM64_CE
+ tristate "SHA3 digest algorithm (ARMv8 Crypto Extensions)"
+ depends on KERNEL_MODE_NEON
+ select CRYPTO_HASH
+ select CRYPTO_SHA3
+
config CRYPTO_GHASH_ARM64_CE
tristate "GHASH/AES-GCM using ARMv8 Crypto Extensions"
depends on KERNEL_MODE_NEON
diff --git a/arch/arm64/crypto/Makefile b/arch/arm64/crypto/Makefile
index d7573d31d397..04eaf8b78816 100644
--- a/arch/arm64/crypto/Makefile
+++ b/arch/arm64/crypto/Makefile
@@ -17,6 +17,9 @@ sha2-ce-y := sha2-ce-glue.o sha2-ce-core.o
obj-$(CONFIG_CRYPTO_SHA512_ARM64_CE) += sha512-ce.o
sha512-ce-y := sha512-ce-glue.o sha512-ce-core.o
+obj-$(CONFIG_CRYPTO_SHA3_ARM64_CE) += sha3-ce.o
+sha3-ce-y := sha3-ce-glue.o sha3-ce-core.o
+
obj-$(CONFIG_CRYPTO_GHASH_ARM64_CE) += ghash-ce.o
ghash-ce-y := ghash-ce-glue.o ghash-ce-core.o
diff --git a/arch/arm64/crypto/sha3-ce-core.S b/arch/arm64/crypto/sha3-ce-core.S
new file mode 100644
index 000000000000..b0b3d68ef3d3
--- /dev/null
+++ b/arch/arm64/crypto/sha3-ce-core.S
@@ -0,0 +1,224 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * sha512-ce-core.S - core SHA-384/SHA-512 transform using v8 Crypto Extensions
+ *
+ * Copyright (C) 2018 Linaro Ltd <ard.biesheuvel at linaro.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+
+ .text
+
+ .irp b,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31
+ .set .Lv\b\().2d, \b
+ .set .Lv\b\().16b, \b
+ .endr
+
+ .macro eor3, rd, rn, ra, rm
+ .inst 0xce000000 | .L\rd | (.L\rn << 5) | (.L\ra << 10) | (.L\rm << 16)
+ .endm
+
+ .macro rax1, rd, rn, rm
+ .inst 0xce608c00 | .L\rd | (.L\rn << 5) | (.L\rm << 16)
+ .endm
+
+ .macro bcax, rd, rn, ra, rm
+ .inst 0xce200000 | .L\rd | (.L\rn << 5) | (.L\ra << 10) | (.L\rm << 16)
+ .endm
+
+ .macro xar, rd, rn, rm, imm6
+ .inst 0xce800000 | .L\rd | (.L\rn << 5) | ((\imm6) << 10) | (.L\rm << 16)
+ .endm
+
+ /*
+ * sha3_ce_transform(u64 *st, const u8 *data, int blocks, int dg_size);
+ */
+ENTRY(sha3_ce_transform)
+ /* load state */
+ mov x8, x0
+ ld1 { v0.1d- v3.1d}, [x8], #32
+ ld1 { v4.1d- v7.1d}, [x8], #32
+ ld1 { v8.1d-v11.1d}, [x8], #32
+ ld1 {v12.1d-v15.1d}, [x8], #32
+ ld1 {v16.1d-v19.1d}, [x8], #32
+ ld1 {v20.1d-v23.1d}, [x8], #32
+ ld1 {v24.1d}, [x8]
+
+0: sub w2, w2, #1
+ mov w8, #24
+ adr_l x9, .Lsha3_rcon
+
+ /* load input */
+ ld1 {v25.8b-v28.8b}, [x1], #32
+ ld1 {v29.8b-v31.8b}, [x1], #24
+ eor v0.8b, v0.8b, v25.8b
+ eor v1.8b, v1.8b, v26.8b
+ eor v2.8b, v2.8b, v27.8b
+ eor v3.8b, v3.8b, v28.8b
+ eor v4.8b, v4.8b, v29.8b
+ eor v5.8b, v5.8b, v30.8b
+ eor v6.8b, v6.8b, v31.8b
+
+ tbnz x3, #6, 2f // SHA3-512
+
+ ld1 {v25.8b-v28.8b}, [x1], #32
+ ld1 {v29.8b-v30.8b}, [x1], #16
+ eor v7.8b, v7.8b, v25.8b
+ eor v8.8b, v8.8b, v26.8b
+ eor v9.8b, v9.8b, v27.8b
+ eor v10.8b, v10.8b, v28.8b
+ eor v11.8b, v11.8b, v29.8b
+ eor v12.8b, v12.8b, v30.8b
+
+ tbnz x3, #4, 1f // SHA3-384 or SHA3-224
+
+ // SHA3-256
+ ld1 {v25.8b-v28.8b}, [x1], #32
+ eor v13.8b, v13.8b, v25.8b
+ eor v14.8b, v14.8b, v26.8b
+ eor v15.8b, v15.8b, v27.8b
+ eor v16.8b, v16.8b, v28.8b
+ b 3f
+
+1: tbz x3, #2, 3f // bit 2 cleared? SHA-384
+
+ // SHA3-224
+ ld1 {v25.8b-v28.8b}, [x1], #32
+ ld1 {v29.8b}, [x1], #8
+ eor v13.8b, v13.8b, v25.8b
+ eor v14.8b, v14.8b, v26.8b
+ eor v15.8b, v15.8b, v27.8b
+ eor v16.8b, v16.8b, v28.8b
+ eor v17.8b, v17.8b, v29.8b
+ b 3f
+
+ // SHA3-512
+2: ld1 {v25.8b-v26.8b}, [x1], #16
+ eor v7.8b, v7.8b, v25.8b
+ eor v8.8b, v8.8b, v26.8b
+
+3: sub w8, w8, #1
+
+ eor3 v25.16b, v0.16b, v5.16b, v10.16b
+ eor3 v25.16b, v25.16b, v15.16b, v20.16b
+ eor3 v26.16b, v1.16b, v6.16b, v11.16b
+ eor3 v26.16b, v26.16b, v16.16b, v21.16b
+ eor3 v27.16b, v2.16b, v7.16b, v12.16b
+ eor3 v27.16b, v27.16b, v17.16b, v22.16b
+ eor3 v28.16b, v3.16b, v8.16b, v13.16b
+ eor3 v28.16b, v28.16b, v18.16b, v23.16b
+ eor3 v29.16b, v4.16b, v9.16b, v14.16b
+ eor3 v29.16b, v29.16b, v19.16b, v24.16b
+
+ rax1 v30.2d, v29.2d, v26.2d // bc[0]
+ rax1 v31.2d, v27.2d, v29.2d // bc[3]
+ rax1 v29.2d, v25.2d, v27.2d // bc[1]
+ rax1 v27.2d, v28.2d, v25.2d // bc[4]
+ rax1 v25.2d, v26.2d, v28.2d // bc[2]
+
+ eor v0.8b, v0.8b, v30.8b
+ mov v26.16b, v1.16b
+ xar v1.2d, v6.2d, v29.2d, (64 - 44)
+ xar v6.2d, v9.2d, v27.2d, (64 - 20)
+ xar v9.2d, v22.2d, v25.2d, (64 - 61)
+ xar v22.2d, v14.2d, v27.2d, (64 - 39)
+ xar v14.2d, v20.2d, v30.2d, (64 - 18)
+ xar v20.2d, v2.2d, v25.2d, (64 - 62)
+ xar v2.2d, v12.2d, v25.2d, (64 - 43)
+ xar v12.2d, v13.2d, v31.2d, (64 - 25)
+ xar v13.2d, v19.2d, v27.2d, (64 - 8)
+ xar v19.2d, v23.2d, v31.2d, (64 - 56)
+ xar v23.2d, v15.2d, v30.2d, (64 - 41)
+ xar v15.2d, v4.2d, v27.2d, (64 - 27)
+ xar v4.2d, v24.2d, v27.2d, (64 - 14)
+ xar v24.2d, v21.2d, v29.2d, (64 - 2)
+ xar v21.2d, v8.2d, v31.2d, (64 - 55)
+ xar v8.2d, v16.2d, v29.2d, (64 - 45)
+ xar v16.2d, v5.2d, v30.2d, (64 - 36)
+ xar v5.2d, v3.2d, v31.2d, (64 - 28)
+ xar v3.2d, v18.2d, v31.2d, (64 - 21)
+ xar v18.2d, v17.2d, v25.2d, (64 - 15)
+ xar v17.2d, v11.2d, v29.2d, (64 - 10)
+ xar v11.2d, v7.2d, v25.2d, (64 - 6)
+ xar v7.2d, v10.2d, v30.2d, (64 - 3)
+ xar v10.2d, v26.2d, v29.2d, (64 - 1)
+
+ ld1 {v27.1d}, [x9], #8
+
+ bcax v25.16b, v0.16b, v1.16b, v2.16b
+ bcax v26.16b, v1.16b, v2.16b, v3.16b
+ bcax v2.16b, v2.16b, v3.16b, v4.16b
+ bcax v3.16b, v3.16b, v4.16b, v0.16b
+ bcax v4.16b, v4.16b, v0.16b, v1.16b
+ mov v0.16b, v25.16b
+ mov v1.16b, v26.16b
+
+ bcax v25.16b, v5.16b, v6.16b, v7.16b
+ bcax v26.16b, v6.16b, v7.16b, v8.16b
+ bcax v7.16b, v7.16b, v8.16b, v9.16b
+ bcax v8.16b, v8.16b, v9.16b, v5.16b
+ bcax v9.16b, v9.16b, v5.16b, v6.16b
+ mov v5.16b, v25.16b
+ mov v6.16b, v26.16b
+
+ bcax v25.16b, v10.16b, v11.16b, v12.16b
+ bcax v26.16b, v11.16b, v12.16b, v13.16b
+ bcax v12.16b, v12.16b, v13.16b, v14.16b
+ bcax v13.16b, v13.16b, v14.16b, v10.16b
+ bcax v14.16b, v14.16b, v10.16b, v11.16b
+ mov v10.16b, v25.16b
+ mov v11.16b, v26.16b
+
+ bcax v25.16b, v15.16b, v16.16b, v17.16b
+ bcax v26.16b, v16.16b, v17.16b, v18.16b
+ bcax v17.16b, v17.16b, v18.16b, v19.16b
+ bcax v18.16b, v18.16b, v19.16b, v15.16b
+ bcax v19.16b, v19.16b, v15.16b, v16.16b
+ mov v15.16b, v25.16b
+ mov v16.16b, v26.16b
+
+ bcax v25.16b, v20.16b, v21.16b, v22.16b
+ bcax v26.16b, v21.16b, v22.16b, v23.16b
+ bcax v22.16b, v22.16b, v23.16b, v24.16b
+ bcax v23.16b, v23.16b, v24.16b, v20.16b
+ bcax v24.16b, v24.16b, v20.16b, v21.16b
+ mov v20.16b, v25.16b
+ mov v21.16b, v26.16b
+
+ eor v0.8b, v0.8b, v27.8b
+
+ cbnz w8, 3b
+ cbnz w2, 0b
+
+ /* save state */
+ mov x8, x0
+ st1 { v0.1d- v3.1d}, [x8], #32
+ st1 { v4.1d- v7.1d}, [x8], #32
+ st1 { v8.1d-v11.1d}, [x8], #32
+ st1 {v12.1d-v15.1d}, [x8], #32
+ st1 {v16.1d-v19.1d}, [x8], #32
+ st1 {v20.1d-v23.1d}, [x8], #32
+ st1 {v24.1d}, [x8]
+ ret
+ENDPROC(sha3_ce_transform)
+
+ .section ".rodata", "a"
+ .align 4
+.Lsha3_rcon:
+ .quad 0x0000000000000001, 0x0000000000008082
+ .quad 0x800000000000808a, 0x8000000080008000
+ .quad 0x000000000000808b, 0x0000000080000001
+ .quad 0x8000000080008081, 0x8000000000008009
+ .quad 0x000000000000008a, 0x0000000000000088
+ .quad 0x0000000080008009, 0x000000008000000a
+ .quad 0x000000008000808b, 0x800000000000008b
+ .quad 0x8000000000008089, 0x8000000000008003
+ .quad 0x8000000000008002, 0x8000000000000080
+ .quad 0x000000000000800a, 0x800000008000000a
+ .quad 0x8000000080008081, 0x8000000000008080
+ .quad 0x0000000080000001, 0x8000000080008008
diff --git a/arch/arm64/crypto/sha3-ce-glue.c b/arch/arm64/crypto/sha3-ce-glue.c
new file mode 100644
index 000000000000..a81377c16f1c
--- /dev/null
+++ b/arch/arm64/crypto/sha3-ce-glue.c
@@ -0,0 +1,156 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * sha3-ce-glue.c - SHA3 using ARMv8 Crypto Extensions
+ *
+ * Copyright (C) 2018 Linaro Ltd <ard.biesheuvel at linaro.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <asm/neon.h>
+#include <asm/simd.h>
+#include <asm/unaligned.h>
+#include <crypto/internal/hash.h>
+#include <crypto/sha3.h>
+#include <linux/cpufeature.h>
+#include <linux/crypto.h>
+#include <linux/module.h>
+
+MODULE_DESCRIPTION("SHA3 secure hash using ARMv8 Crypto Extensions");
+MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel at linaro.org>");
+MODULE_LICENSE("GPL v2");
+
+asmlinkage void sha3_ce_transform(u64 *st, const u8 *data, int blocks,
+ int md_len);
+
+static int sha3_ce_update(struct shash_desc *desc, const u8 *data,
+ unsigned int len)
+{
+ struct sha3_state *sctx = shash_desc_ctx(desc);
+ unsigned int digest_size = crypto_shash_digestsize(desc->tfm);
+
+ if (!may_use_simd())
+ return crypto_sha3_update(desc, data, len);
+
+ if ((sctx->partial + len) >= sctx->rsiz) {
+ int blocks;
+
+ if (sctx->partial) {
+ int p = sctx->rsiz - sctx->partial;
+
+ memcpy(sctx->buf + sctx->partial, data, p);
+ kernel_neon_begin();
+ sha3_ce_transform(sctx->st, sctx->buf, 1, digest_size);
+ kernel_neon_end();
+
+ data += p;
+ len -= p;
+ sctx->partial = 0;
+ }
+
+ blocks = len / sctx->rsiz;
+ len %= sctx->rsiz;
+
+ if (blocks) {
+ kernel_neon_begin();
+ sha3_ce_transform(sctx->st, data, blocks, digest_size);
+ kernel_neon_end();
+ data += blocks * sctx->rsiz;
+ }
+ }
+
+ if (len) {
+ memcpy(sctx->buf + sctx->partial, data, len);
+ sctx->partial += len;
+ }
+ return 0;
+}
+
+static int sha3_ce_final(struct shash_desc *desc, u8 *out)
+{
+ struct sha3_state *sctx = shash_desc_ctx(desc);
+ unsigned int digest_size = crypto_shash_digestsize(desc->tfm);
+ __le64 *digest = (__le64 *)out;
+ int i;
+
+ if (!may_use_simd())
+ return crypto_sha3_final(desc, out);
+
+ sctx->buf[sctx->partial++] = 0x06;
+ memset(sctx->buf + sctx->partial, 0, sctx->rsiz - sctx->partial);
+ sctx->buf[sctx->rsiz - 1] |= 0x80;
+
+ kernel_neon_begin();
+ sha3_ce_transform(sctx->st, sctx->buf, 1, digest_size);
+ kernel_neon_end();
+
+ for (i = 0; i < digest_size / 8; i++)
+ put_unaligned_le64(sctx->st[i], digest++);
+
+ if (digest_size & 4)
+ put_unaligned_le32(sctx->st[i], (__le32 *)digest);
+
+ *sctx = (struct sha3_state){};
+ return 0;
+}
+
+static struct shash_alg algs[] = { {
+ .digestsize = SHA3_224_DIGEST_SIZE,
+ .init = crypto_sha3_init,
+ .update = sha3_ce_update,
+ .final = sha3_ce_final,
+ .descsize = sizeof(struct sha3_state),
+ .base.cra_name = "sha3-224",
+ .base.cra_driver_name = "sha3-224-ce",
+ .base.cra_flags = CRYPTO_ALG_TYPE_SHASH,
+ .base.cra_blocksize = SHA3_224_BLOCK_SIZE,
+ .base.cra_module = THIS_MODULE,
+}, {
+ .digestsize = SHA3_256_DIGEST_SIZE,
+ .init = crypto_sha3_init,
+ .update = sha3_ce_update,
+ .final = sha3_ce_final,
+ .descsize = sizeof(struct sha3_state),
+ .base.cra_name = "sha3-256",
+ .base.cra_driver_name = "sha3-256-ce",
+ .base.cra_flags = CRYPTO_ALG_TYPE_SHASH,
+ .base.cra_blocksize = SHA3_256_BLOCK_SIZE,
+ .base.cra_module = THIS_MODULE,
+}, {
+ .digestsize = SHA3_384_DIGEST_SIZE,
+ .init = crypto_sha3_init,
+ .update = sha3_ce_update,
+ .final = sha3_ce_final,
+ .descsize = sizeof(struct sha3_state),
+ .base.cra_name = "sha3-384",
+ .base.cra_driver_name = "sha3-384-ce",
+ .base.cra_flags = CRYPTO_ALG_TYPE_SHASH,
+ .base.cra_blocksize = SHA3_384_BLOCK_SIZE,
+ .base.cra_module = THIS_MODULE,
+}, {
+ .digestsize = SHA3_512_DIGEST_SIZE,
+ .init = crypto_sha3_init,
+ .update = sha3_ce_update,
+ .final = sha3_ce_final,
+ .descsize = sizeof(struct sha3_state),
+ .base.cra_name = "sha3-512",
+ .base.cra_driver_name = "sha3-512-ce",
+ .base.cra_flags = CRYPTO_ALG_TYPE_SHASH,
+ .base.cra_blocksize = SHA3_512_BLOCK_SIZE,
+ .base.cra_module = THIS_MODULE,
+} };
+
+static int __init sha3_ce_mod_init(void)
+{
+ return crypto_register_shashes(algs, ARRAY_SIZE(algs));
+}
+
+static void __exit sha3_ce_mod_fini(void)
+{
+ crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
+}
+
+module_cpu_feature_match(SHA3, sha3_ce_mod_init);
+module_exit(sha3_ce_mod_fini);
--
2.11.0
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