@@ -36,11 +36,12 @@ TEXT_OFFSET := 0x00080000
export TEXT_OFFSET GZFLAGS
-core-y += arch/arm64/kernel/ arch/arm64/mm/
-core-$(CONFIG_KVM) += arch/arm64/kvm/
-core-$(CONFIG_XEN) += arch/arm64/xen/
-libs-y := arch/arm64/lib/ $(libs-y)
-libs-y += $(LIBGCC)
+core-y += arch/arm64/kernel/ arch/arm64/mm/
+core-$(CONFIG_KVM) += arch/arm64/kvm/
+core-$(CONFIG_XEN) += arch/arm64/xen/
+core-$(CONFIG_CRYPTO) += arch/arm64/crypto/
+libs-y := arch/arm64/lib/ $(libs-y)
+libs-y += $(LIBGCC)
# Default target when executing plain make
KBUILD_IMAGE := Image.gz
new file mode 100644
@@ -0,0 +1,14 @@
+#
+# linux/arch/arm64/crypto/Makefile
+#
+# Copyright (C) 2013 Linaro Ltd <ard.biesheuvel@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.
+#
+
+aesce-sync-y := aes-sync.o
+obj-m += aesce-sync.o
+
+CFLAGS_aes-sync.o += -march=armv8-a+crypto
new file mode 100644
@@ -0,0 +1,106 @@
+/*
+ * linux/arch/arm64/crypto/aes-sync.c
+ *
+ * Copyright (C) 2013 Linaro Ltd <ard.biesheuvel@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 <crypto/aes.h>
+#include <linux/crypto.h>
+#include <linux/module.h>
+
+static void aes_cipher_encrypt(struct crypto_tfm *tfm, u8 dst[], u8 const src[])
+{
+ struct crypto_aes_ctx *ctx = crypto_tfm_ctx(tfm);
+ u32 rounds = 6 + ctx->key_length / 4;
+ DEFINE_NEON_REGSTACK_PARTIAL(regs, 2);
+
+ kernel_neon_begin(regs);
+
+ __asm__(" ld1 {v0.16b}, [%[in]] ;"
+ " ld1 {v1.16b}, [%[key]], #16 ;"
+ "0: aese v0.16b, v1.16b ;"
+ " subs %[rounds], %[rounds], #1 ;"
+ " ld1 {v1.16b}, [%[key]], #16 ;"
+ " beq 1f ;"
+ " aesmc v0.16b, v0.16b ;"
+ " b 0b ;"
+ "1: eor v0.16b, v0.16b, v1.16b ;"
+ " st1 {v0.16b}, [%[out]] ;"
+ : :
+ [out] "r"(dst),
+ [in] "r"(src),
+ [rounds] "r"(rounds),
+ [key] "r"(ctx->key_enc)
+ : "cc");
+
+ kernel_neon_end(regs);
+}
+
+static void aes_cipher_decrypt(struct crypto_tfm *tfm, u8 dst[], u8 const src[])
+{
+ struct crypto_aes_ctx *ctx = crypto_tfm_ctx(tfm);
+ u32 rounds = 6 + ctx->key_length / 4;
+ DEFINE_NEON_REGSTACK_PARTIAL(regs, 2);
+
+ kernel_neon_begin(regs);
+
+ __asm__(" ld1 {v0.16b}, [%[in]] ;"
+ " ld1 {v1.16b}, [%[key]], #16 ;"
+ "0: aesd v0.16b, v1.16b ;"
+ " ld1 {v1.16b}, [%[key]], #16 ;"
+ " subs %[rounds], %[rounds], #1 ;"
+ " beq 1f ;"
+ " aesimc v0.16b, v0.16b ;"
+ " b 0b ;"
+ "1: eor v0.16b, v0.16b, v1.16b ;"
+ " st1 {v0.16b}, [%[out]] ;"
+ : :
+ [out] "r"(dst),
+ [in] "r"(src),
+ [rounds] "r"(rounds),
+ [key] "r"(ctx->key_dec)
+ : "cc");
+
+ kernel_neon_end(regs);
+}
+
+static struct crypto_alg aes_alg = {
+ .cra_name = "aes",
+ .cra_driver_name = "aes-ce",
+ .cra_priority = 300,
+ .cra_flags = CRYPTO_ALG_TYPE_CIPHER,
+ .cra_blocksize = AES_BLOCK_SIZE,
+ .cra_ctxsize = sizeof(struct crypto_aes_ctx),
+ .cra_module = THIS_MODULE,
+ .cra_cipher = {
+ .cia_min_keysize = AES_MIN_KEY_SIZE,
+ .cia_max_keysize = AES_MAX_KEY_SIZE,
+ .cia_setkey = crypto_aes_set_key,
+ .cia_encrypt = aes_cipher_encrypt,
+ .cia_decrypt = aes_cipher_decrypt
+ }
+};
+
+static int __init aes_mod_init(void)
+{
+ if (0) // TODO check for crypto extensions
+ return -ENODEV;
+ return crypto_register_alg(&aes_alg);
+}
+
+static void __exit aes_mod_exit(void)
+{
+ crypto_unregister_alg(&aes_alg);
+}
+
+module_init(aes_mod_init);
+module_exit(aes_mod_exit);
+
+MODULE_DESCRIPTION("Synchronous AES using ARMv8 Crypto Extensions");
+MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
+MODULE_LICENSE("GPL");
This implements the core AES cipher using the Crypto Extensions, using only NEON register q0 and q1. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> --- arch/arm64/Makefile | 11 +++-- arch/arm64/crypto/Makefile | 14 ++++++ arch/arm64/crypto/aes-sync.c | 106 +++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 126 insertions(+), 5 deletions(-) create mode 100644 arch/arm64/crypto/Makefile create mode 100644 arch/arm64/crypto/aes-sync.c