diff options
Diffstat (limited to 'arch/arm/crypto/curve25519-glue.c')
| -rw-r--r-- | arch/arm/crypto/curve25519-glue.c | 137 |
1 files changed, 0 insertions, 137 deletions
diff --git a/arch/arm/crypto/curve25519-glue.c b/arch/arm/crypto/curve25519-glue.c deleted file mode 100644 index e7b87e09dd99..000000000000 --- a/arch/arm/crypto/curve25519-glue.c +++ /dev/null @@ -1,137 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 OR MIT -/* - * Copyright (C) 2015-2019 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved. - * - * Based on public domain code from Daniel J. Bernstein and Peter Schwabe. This - * began from SUPERCOP's curve25519/neon2/scalarmult.s, but has subsequently been - * manually reworked for use in kernel space. - */ - -#include <asm/hwcap.h> -#include <asm/neon.h> -#include <asm/simd.h> -#include <crypto/internal/kpp.h> -#include <crypto/internal/simd.h> -#include <linux/types.h> -#include <linux/module.h> -#include <linux/init.h> -#include <linux/jump_label.h> -#include <linux/scatterlist.h> -#include <crypto/curve25519.h> - -asmlinkage void curve25519_neon(u8 mypublic[CURVE25519_KEY_SIZE], - const u8 secret[CURVE25519_KEY_SIZE], - const u8 basepoint[CURVE25519_KEY_SIZE]); - -static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_neon); - -void curve25519_arch(u8 out[CURVE25519_KEY_SIZE], - const u8 scalar[CURVE25519_KEY_SIZE], - const u8 point[CURVE25519_KEY_SIZE]) -{ - if (static_branch_likely(&have_neon) && crypto_simd_usable()) { - kernel_neon_begin(); - curve25519_neon(out, scalar, point); - kernel_neon_end(); - } else { - curve25519_generic(out, scalar, point); - } -} -EXPORT_SYMBOL(curve25519_arch); - -void curve25519_base_arch(u8 pub[CURVE25519_KEY_SIZE], - const u8 secret[CURVE25519_KEY_SIZE]) -{ - return curve25519_arch(pub, secret, curve25519_base_point); -} -EXPORT_SYMBOL(curve25519_base_arch); - -static int curve25519_set_secret(struct crypto_kpp *tfm, const void *buf, - unsigned int len) -{ - u8 *secret = kpp_tfm_ctx(tfm); - - if (!len) - curve25519_generate_secret(secret); - else if (len == CURVE25519_KEY_SIZE && - crypto_memneq(buf, curve25519_null_point, CURVE25519_KEY_SIZE)) - memcpy(secret, buf, CURVE25519_KEY_SIZE); - else - return -EINVAL; - return 0; -} - -static int curve25519_compute_value(struct kpp_request *req) -{ - struct crypto_kpp *tfm = crypto_kpp_reqtfm(req); - const u8 *secret = kpp_tfm_ctx(tfm); - u8 public_key[CURVE25519_KEY_SIZE]; - u8 buf[CURVE25519_KEY_SIZE]; - int copied, nbytes; - u8 const *bp; - - if (req->src) { - copied = sg_copy_to_buffer(req->src, - sg_nents_for_len(req->src, - CURVE25519_KEY_SIZE), - public_key, CURVE25519_KEY_SIZE); - if (copied != CURVE25519_KEY_SIZE) - return -EINVAL; - bp = public_key; - } else { - bp = curve25519_base_point; - } - - curve25519_arch(buf, secret, bp); - - /* might want less than we've got */ - nbytes = min_t(size_t, CURVE25519_KEY_SIZE, req->dst_len); - copied = sg_copy_from_buffer(req->dst, sg_nents_for_len(req->dst, - nbytes), - buf, nbytes); - if (copied != nbytes) - return -EINVAL; - return 0; -} - -static unsigned int curve25519_max_size(struct crypto_kpp *tfm) -{ - return CURVE25519_KEY_SIZE; -} - -static struct kpp_alg curve25519_alg = { - .base.cra_name = "curve25519", - .base.cra_driver_name = "curve25519-neon", - .base.cra_priority = 200, - .base.cra_module = THIS_MODULE, - .base.cra_ctxsize = CURVE25519_KEY_SIZE, - - .set_secret = curve25519_set_secret, - .generate_public_key = curve25519_compute_value, - .compute_shared_secret = curve25519_compute_value, - .max_size = curve25519_max_size, -}; - -static int __init arm_curve25519_init(void) -{ - if (elf_hwcap & HWCAP_NEON) { - static_branch_enable(&have_neon); - return IS_REACHABLE(CONFIG_CRYPTO_KPP) ? - crypto_register_kpp(&curve25519_alg) : 0; - } - return 0; -} - -static void __exit arm_curve25519_exit(void) -{ - if (IS_REACHABLE(CONFIG_CRYPTO_KPP) && elf_hwcap & HWCAP_NEON) - crypto_unregister_kpp(&curve25519_alg); -} - -module_init(arm_curve25519_init); -module_exit(arm_curve25519_exit); - -MODULE_ALIAS_CRYPTO("curve25519"); -MODULE_ALIAS_CRYPTO("curve25519-neon"); -MODULE_DESCRIPTION("Public key crypto: Curve25519 (NEON-accelerated)"); -MODULE_LICENSE("GPL v2"); |