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crypto: curve25519 - implement generic KPP driver

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Expose the generic Curve25519 library via the crypto API KPP interface.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Ard Biesheuvel 2019-11-08 13:22:34 +01:00 committed by Herbert Xu
parent f613457a7a
commit ee772cb641
3 changed files with 96 additions and 0 deletions
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5
crypto/Kconfig
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@ -264,6 +264,11 @@ config CRYPTO_ECRDSA
standard algorithms (called GOST algorithms). Only signature verification
is implemented.
config CRYPTO_CURVE25519
tristate "Curve25519 algorithm"
select CRYPTO_KPP
select CRYPTO_LIB_CURVE25519_GENERIC
comment "Authenticated Encryption with Associated Data"
config CRYPTO_CCM

1
crypto/Makefile
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@ -168,6 +168,7 @@ obj-$(CONFIG_CRYPTO_ZSTD) += zstd.o
obj-$(CONFIG_CRYPTO_OFB) += ofb.o
obj-$(CONFIG_CRYPTO_ECC) += ecc.o
obj-$(CONFIG_CRYPTO_ESSIV) += essiv.o
obj-$(CONFIG_CRYPTO_CURVE25519) += curve25519-generic.o
ecdh_generic-y += ecdh.o
ecdh_generic-y += ecdh_helper.o

90
crypto/curve25519-generic.c Normal file
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@ -0,0 +1,90 @@
// SPDX-License-Identifier: GPL-2.0-or-later
#include <crypto/curve25519.h>
#include <crypto/internal/kpp.h>
#include <crypto/kpp.h>
#include <linux/module.h>
#include <linux/scatterlist.h>
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_generic(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-generic",
.base.cra_priority = 100,
.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 curve25519_init(void)
{
return crypto_register_kpp(&curve25519_alg);
}
static void curve25519_exit(void)
{
crypto_unregister_kpp(&curve25519_alg);
}
subsys_initcall(curve25519_init);
module_exit(curve25519_exit);
MODULE_ALIAS_CRYPTO("curve25519");
MODULE_ALIAS_CRYPTO("curve25519-generic");
MODULE_LICENSE("GPL");