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Subject[PATCH v8 5/9] crypto: move curve_id of ECDH to algorithm name
Date
1. Move curve id of ECDH from the key into the algorithm name instead in
crypto;
2. Modify 'testmgr.c' and 'testmgr.h' to adapt the modification.

Signed-off-by: Meng Yu <yumeng18@huawei.com>
Reviewed-by: Zaibo Xu <xuzaibo@huawei.com>
---
crypto/ecdh.c | 72 +++++++++++++++++++++++++++++++++++----------------
crypto/ecdh_helper.c | 4 +--
crypto/testmgr.c | 11 ++++++--
crypto/testmgr.h | 32 ++++++++++-------------
include/crypto/ecdh.h | 2 --
5 files changed, 74 insertions(+), 47 deletions(-)

diff --git a/crypto/ecdh.c b/crypto/ecdh.c
index 96f80c8..04a427b 100644
--- a/crypto/ecdh.c
+++ b/crypto/ecdh.c
@@ -23,33 +23,16 @@ static inline struct ecdh_ctx *ecdh_get_ctx(struct crypto_kpp *tfm)
return kpp_tfm_ctx(tfm);
}

-static unsigned int ecdh_supported_curve(unsigned int curve_id)
-{
- switch (curve_id) {
- case ECC_CURVE_NIST_P192: return ECC_CURVE_NIST_P192_DIGITS;
- case ECC_CURVE_NIST_P256: return ECC_CURVE_NIST_P256_DIGITS;
- default: return 0;
- }
-}
-
static int ecdh_set_secret(struct crypto_kpp *tfm, const void *buf,
unsigned int len)
{
struct ecdh_ctx *ctx = ecdh_get_ctx(tfm);
struct ecdh params;
- unsigned int ndigits;

if (crypto_ecdh_decode_key(buf, len, &params) < 0 ||
- params.key_size > sizeof(ctx->private_key))
+ params.key_size > sizeof(u64) * ctx->ndigits)
return -EINVAL;

- ndigits = ecdh_supported_curve(params.curve_id);
- if (!ndigits)
- return -EINVAL;
-
- ctx->curve_id = params.curve_id;
- ctx->ndigits = ndigits;
-
if (!params.key || !params.key_size)
return ecc_gen_privkey(ctx->curve_id, ctx->ndigits,
ctx->private_key);
@@ -140,13 +123,24 @@ static unsigned int ecdh_max_size(struct crypto_kpp *tfm)
return ctx->ndigits << (ECC_DIGITS_TO_BYTES_SHIFT + 1);
}

-static struct kpp_alg ecdh = {
+static int ecdh_nist_p192_init_tfm(struct crypto_kpp *tfm)
+{
+ struct ecdh_ctx *ctx = ecdh_get_ctx(tfm);
+
+ ctx->curve_id = ECC_CURVE_NIST_P192;
+ ctx->ndigits = ECC_CURVE_NIST_P192_DIGITS;
+
+ return 0;
+}
+
+static struct kpp_alg ecdh_nist_p192 = {
.set_secret = ecdh_set_secret,
.generate_public_key = ecdh_compute_value,
.compute_shared_secret = ecdh_compute_value,
.max_size = ecdh_max_size,
+ .init = ecdh_nist_p192_init_tfm,
.base = {
- .cra_name = "ecdh",
+ .cra_name = "ecdh-nist-p192",
.cra_driver_name = "ecdh-generic",
.cra_priority = 100,
.cra_module = THIS_MODULE,
@@ -154,14 +148,48 @@ static struct kpp_alg ecdh = {
},
};

+static int ecdh_nist_p256_init_tfm(struct crypto_kpp *tfm)
+{
+ struct ecdh_ctx *ctx = ecdh_get_ctx(tfm);
+
+ ctx->curve_id = ECC_CURVE_NIST_P256;
+ ctx->ndigits = ECC_CURVE_NIST_P256_DIGITS;
+
+ return 0;
+}
+
+static struct kpp_alg ecdh_nist_p256 = {
+ .set_secret = ecdh_set_secret,
+ .generate_public_key = ecdh_compute_value,
+ .compute_shared_secret = ecdh_compute_value,
+ .max_size = ecdh_max_size,
+ .init = ecdh_nist_p256_init_tfm,
+ .base = {
+ .cra_name = "ecdh-nist-p256",
+ .cra_driver_name = "ecdh-generic",
+ .cra_priority = 100,
+ .cra_module = THIS_MODULE,
+ .cra_ctxsize = sizeof(struct ecdh_ctx),
+ },
+};
+
+static bool ecdh_nist_p192_registered;
+
static int ecdh_init(void)
{
- return crypto_register_kpp(&ecdh);
+ int ret;
+
+ ret = crypto_register_kpp(&ecdh_nist_p192);
+ ecdh_nist_p192_registered = ret == 0;
+
+ return crypto_register_kpp(&ecdh_nist_p256);
}

static void ecdh_exit(void)
{
- crypto_unregister_kpp(&ecdh);
+ if (ecdh_nist_p192_registered)
+ crypto_unregister_kpp(&ecdh_nist_p192);
+ crypto_unregister_kpp(&ecdh_nist_p256);
}

subsys_initcall(ecdh_init);
diff --git a/crypto/ecdh_helper.c b/crypto/ecdh_helper.c
index 66fcb2e..c79696f 100644
--- a/crypto/ecdh_helper.c
+++ b/crypto/ecdh_helper.c
@@ -10,7 +10,7 @@
#include <crypto/ecdh.h>
#include <crypto/kpp.h>

-#define ECDH_KPP_SECRET_MIN_SIZE (sizeof(struct kpp_secret) + 2 * sizeof(short))
+#define ECDH_KPP_SECRET_MIN_SIZE (sizeof(struct kpp_secret) + sizeof(short))

static inline u8 *ecdh_pack_data(void *dst, const void *src, size_t sz)
{
@@ -46,7 +46,6 @@ int crypto_ecdh_encode_key(char *buf, unsigned int len,
return -EINVAL;

ptr = ecdh_pack_data(ptr, &secret, sizeof(secret));
- ptr = ecdh_pack_data(ptr, &params->curve_id, sizeof(params->curve_id));
ptr = ecdh_pack_data(ptr, &params->key_size, sizeof(params->key_size));
ecdh_pack_data(ptr, params->key, params->key_size);

@@ -67,7 +66,6 @@ int crypto_ecdh_decode_key(const char *buf, unsigned int len,
if (secret.type != CRYPTO_KPP_SECRET_TYPE_ECDH)
return -EINVAL;

- ptr = ecdh_unpack_data(&params->curve_id, ptr, sizeof(params->curve_id));
ptr = ecdh_unpack_data(&params->key_size, ptr, sizeof(params->key_size));
if (secret.len != crypto_ecdh_key_len(params))
return -EINVAL;
diff --git a/crypto/testmgr.c b/crypto/testmgr.c
index 1a4103b..b890ac5 100644
--- a/crypto/testmgr.c
+++ b/crypto/testmgr.c
@@ -4910,11 +4910,18 @@ static const struct alg_test_desc alg_test_descs[] = {
}
}, {
#endif
- .alg = "ecdh",
+ .alg = "ecdh-nist-p192",
.test = alg_test_kpp,
.fips_allowed = 1,
.suite = {
- .kpp = __VECS(ecdh_tv_template)
+ .kpp = __VECS(ecdh_p192_tv_template)
+ }
+ }, {
+ .alg = "ecdh-nist-p256",
+ .test = alg_test_kpp,
+ .fips_allowed = 1,
+ .suite = {
+ .kpp = __VECS(ecdh_p256_tv_template)
}
}, {
.alg = "ecrdsa",
diff --git a/crypto/testmgr.h b/crypto/testmgr.h
index 99aca08..85bf54e 100644
--- a/crypto/testmgr.h
+++ b/crypto/testmgr.h
@@ -2261,19 +2261,17 @@ static const struct kpp_testvec curve25519_tv_template[] = {
}
};

-static const struct kpp_testvec ecdh_tv_template[] = {
+static const struct kpp_testvec ecdh_p192_tv_template[] = {
{
#ifndef CONFIG_CRYPTO_FIPS
.secret =
#ifdef __LITTLE_ENDIAN
"\x02\x00" /* type */
- "\x20\x00" /* len */
- "\x01\x00" /* curve_id */
+ "\x1e\x00" /* len */
"\x18\x00" /* key_size */
#else
"\x00\x02" /* type */
- "\x00\x20" /* len */
- "\x00\x01" /* curve_id */
+ "\x00\x1e" /* len */
"\x00\x18" /* key_size */
#endif
"\xb5\x05\xb1\x71\x1e\xbf\x8c\xda"
@@ -2301,18 +2299,20 @@ static const struct kpp_testvec ecdh_tv_template[] = {
.b_public_size = 48,
.expected_a_public_size = 48,
.expected_ss_size = 24
- }, {
+ }
#endif
+};
+
+static const struct kpp_testvec ecdh_p256_tv_template[] = {
+ {
.secret =
#ifdef __LITTLE_ENDIAN
"\x02\x00" /* type */
- "\x28\x00" /* len */
- "\x02\x00" /* curve_id */
+ "\x26\x00" /* len */
"\x20\x00" /* key_size */
#else
"\x00\x02" /* type */
- "\x00\x28" /* len */
- "\x00\x02" /* curve_id */
+ "\x00\x26" /* len */
"\x00\x20" /* key_size */
#endif
"\x24\xd1\x21\xeb\xe5\xcf\x2d\x83"
@@ -2350,25 +2350,21 @@ static const struct kpp_testvec ecdh_tv_template[] = {
.secret =
#ifdef __LITTLE_ENDIAN
"\x02\x00" /* type */
- "\x08\x00" /* len */
- "\x02\x00" /* curve_id */
+ "\x06\x00" /* len */
"\x00\x00", /* key_size */
#else
"\x00\x02" /* type */
- "\x00\x08" /* len */
- "\x00\x02" /* curve_id */
+ "\x00\x06" /* len */
"\x00\x00", /* key_size */
#endif
.b_secret =
#ifdef __LITTLE_ENDIAN
"\x02\x00" /* type */
- "\x28\x00" /* len */
- "\x02\x00" /* curve_id */
+ "\x26\x00" /* len */
"\x20\x00" /* key_size */
#else
"\x00\x02" /* type */
- "\x00\x28" /* len */
- "\x00\x02" /* curve_id */
+ "\x00\x26" /* len */
"\x00\x20" /* key_size */
#endif
"\x24\xd1\x21\xeb\xe5\xcf\x2d\x83"
diff --git a/include/crypto/ecdh.h b/include/crypto/ecdh.h
index a5b805b..deaaa48 100644
--- a/include/crypto/ecdh.h
+++ b/include/crypto/ecdh.h
@@ -29,12 +29,10 @@
/**
* struct ecdh - define an ECDH private key
*
- * @curve_id: ECC curve the key is based on.
* @key: Private ECDH key
* @key_size: Size of the private ECDH key
*/
struct ecdh {
- unsigned short curve_id;
char *key;
unsigned short key_size;
};
--
2.8.1
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