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d540725871
Without this patch, the chacha block counter is not incremented on neon rounds, resulting in incorrect calculations and corrupt packets. This also switches to using `--no-numbered --zero-commit` so that future diffs are smaller. Reported-by: Hans Geiblinger <cybrnook2002@yahoo.com> Reviewed-by: Ilya Lipnitskiy <ilya.lipnitskiy@gmail.com> Cc: David Bauer <mail@david-bauer.net> Cc: Petr Štetiar <ynezz@true.cz> Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
137 lines
3.7 KiB
Diff
137 lines
3.7 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Ard Biesheuvel <ardb@kernel.org>
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Date: Fri, 8 Nov 2019 13:22:34 +0100
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Subject: [PATCH] crypto: curve25519 - implement generic KPP driver
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commit ee772cb641135739c1530647391d5a04c39db192 upstream.
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Expose the generic Curve25519 library via the crypto API KPP interface.
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Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
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Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
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---
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crypto/Kconfig | 5 +++
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crypto/Makefile | 1 +
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crypto/curve25519-generic.c | 90 +++++++++++++++++++++++++++++++++++++
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3 files changed, 96 insertions(+)
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create mode 100644 crypto/curve25519-generic.c
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--- a/crypto/Kconfig
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+++ b/crypto/Kconfig
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@@ -264,6 +264,11 @@ config CRYPTO_ECRDSA
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standard algorithms (called GOST algorithms). Only signature verification
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is implemented.
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+config CRYPTO_CURVE25519
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+ tristate "Curve25519 algorithm"
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+ select CRYPTO_KPP
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+ select CRYPTO_LIB_CURVE25519_GENERIC
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+
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comment "Authenticated Encryption with Associated Data"
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config CRYPTO_CCM
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--- a/crypto/Makefile
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+++ b/crypto/Makefile
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@@ -167,6 +167,7 @@ obj-$(CONFIG_CRYPTO_ZSTD) += zstd.o
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obj-$(CONFIG_CRYPTO_OFB) += ofb.o
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obj-$(CONFIG_CRYPTO_ECC) += ecc.o
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obj-$(CONFIG_CRYPTO_ESSIV) += essiv.o
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+obj-$(CONFIG_CRYPTO_CURVE25519) += curve25519-generic.o
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ecdh_generic-y += ecdh.o
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ecdh_generic-y += ecdh_helper.o
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--- /dev/null
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+++ b/crypto/curve25519-generic.c
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@@ -0,0 +1,90 @@
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+// SPDX-License-Identifier: GPL-2.0-or-later
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+
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+#include <crypto/curve25519.h>
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+#include <crypto/internal/kpp.h>
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+#include <crypto/kpp.h>
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+#include <linux/module.h>
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+#include <linux/scatterlist.h>
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+
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+static int curve25519_set_secret(struct crypto_kpp *tfm, const void *buf,
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+ unsigned int len)
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+{
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+ u8 *secret = kpp_tfm_ctx(tfm);
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+
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+ if (!len)
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+ curve25519_generate_secret(secret);
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+ else if (len == CURVE25519_KEY_SIZE &&
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+ crypto_memneq(buf, curve25519_null_point, CURVE25519_KEY_SIZE))
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+ memcpy(secret, buf, CURVE25519_KEY_SIZE);
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+ else
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+ return -EINVAL;
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+ return 0;
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+}
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+
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+static int curve25519_compute_value(struct kpp_request *req)
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+{
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+ struct crypto_kpp *tfm = crypto_kpp_reqtfm(req);
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+ const u8 *secret = kpp_tfm_ctx(tfm);
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+ u8 public_key[CURVE25519_KEY_SIZE];
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+ u8 buf[CURVE25519_KEY_SIZE];
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+ int copied, nbytes;
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+ u8 const *bp;
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+
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+ if (req->src) {
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+ copied = sg_copy_to_buffer(req->src,
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+ sg_nents_for_len(req->src,
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+ CURVE25519_KEY_SIZE),
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+ public_key, CURVE25519_KEY_SIZE);
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+ if (copied != CURVE25519_KEY_SIZE)
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+ return -EINVAL;
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+ bp = public_key;
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+ } else {
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+ bp = curve25519_base_point;
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+ }
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+
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+ curve25519_generic(buf, secret, bp);
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+
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+ /* might want less than we've got */
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+ nbytes = min_t(size_t, CURVE25519_KEY_SIZE, req->dst_len);
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+ copied = sg_copy_from_buffer(req->dst, sg_nents_for_len(req->dst,
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+ nbytes),
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+ buf, nbytes);
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+ if (copied != nbytes)
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+ return -EINVAL;
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+ return 0;
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+}
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+
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+static unsigned int curve25519_max_size(struct crypto_kpp *tfm)
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+{
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+ return CURVE25519_KEY_SIZE;
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+}
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+
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+static struct kpp_alg curve25519_alg = {
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+ .base.cra_name = "curve25519",
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+ .base.cra_driver_name = "curve25519-generic",
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+ .base.cra_priority = 100,
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+ .base.cra_module = THIS_MODULE,
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+ .base.cra_ctxsize = CURVE25519_KEY_SIZE,
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+
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+ .set_secret = curve25519_set_secret,
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+ .generate_public_key = curve25519_compute_value,
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+ .compute_shared_secret = curve25519_compute_value,
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+ .max_size = curve25519_max_size,
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+};
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+
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+static int curve25519_init(void)
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+{
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+ return crypto_register_kpp(&curve25519_alg);
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+}
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+
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+static void curve25519_exit(void)
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+{
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+ crypto_unregister_kpp(&curve25519_alg);
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+}
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+
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+subsys_initcall(curve25519_init);
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+module_exit(curve25519_exit);
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+
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+MODULE_ALIAS_CRYPTO("curve25519");
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+MODULE_ALIAS_CRYPTO("curve25519-generic");
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+MODULE_LICENSE("GPL");
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