[PATCH v7 4/7] crypto: add ecc curve and expose them

From: Meng Yu
Date: Fri Jan 22 2021 - 02:15:33 EST

1. Add ecc curves(P224, P384, P521) for ECDH;
2. Reorder ECC 'Curves ID' in 'include/crypto/ecdh.h', and
modify 'curve_id' used in 'testmgr.h';
3. Add function 'ecc_get_curve_param' in 'include/crypto/ecc_curve.h' for
users, so everyone in the kernel tree can easily get ecc curve params;

Signed-off-by: Meng Yu <yumeng18@xxxxxxxxxx>
Reviewed-by: Zaibo Xu <xuzaibo@xxxxxxxxxx>
Reported-by: kernel test robot <lkp@xxxxxxxxx>
---
crypto/ecc.c | 15 ++++-
crypto/ecc.h | 37 +----------
crypto/ecc_curve_defs.h | 152 ++++++++++++++++++++++++++++++++++++++-------
crypto/testmgr.h | 12 ++--
include/crypto/ecc_curve.h | 53 ++++++++++++++++
include/crypto/ecdh.h | 5 +-
6 files changed, 207 insertions(+), 67 deletions(-)
create mode 100644 include/crypto/ecc_curve.h

diff --git a/crypto/ecc.c b/crypto/ecc.c
index c80aa25..cfa1dc3 100644
--- a/crypto/ecc.c
+++ b/crypto/ecc.c
@@ -24,6 +24,7 @@
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

+#include <crypto/ecc_curve.h>
#include <linux/module.h>
#include <linux/random.h>
#include <linux/slab.h>
@@ -42,14 +43,24 @@ typedef struct {
u64 m_high;
} uint128_t;

+/* Returns CURVE if get curve succssful, NULL otherwise */
+const struct ecc_curve *ecc_get_curve_by_id(unsigned int curve_id)
+{
+ if (curve_id >= ECC_CURVE_NIST_P192 && curve_id <= ECC_CURVE_NIST_P521)
+ return &ecc_curve_list[curve_id - 1];
+
+ return NULL;
+}
+EXPORT_SYMBOL(ecc_get_curve_by_id);
+
static inline const struct ecc_curve *ecc_get_curve(unsigned int curve_id)
{
switch (curve_id) {
/* In FIPS mode only allow P256 and higher */
case ECC_CURVE_NIST_P192:
- return fips_enabled ? NULL : &nist_p192;
+ return fips_enabled ? NULL : ecc_get_curve_by_id(curve_id);
case ECC_CURVE_NIST_P256:
- return &nist_p256;
+ return ecc_get_curve_by_id(curve_id);
default:
return NULL;
}
diff --git a/crypto/ecc.h b/crypto/ecc.h
index d4e546b..38a81d4 100644
--- a/crypto/ecc.h
+++ b/crypto/ecc.h
@@ -26,6 +26,8 @@
#ifndef _CRYPTO_ECC_H
#define _CRYPTO_ECC_H

+#include <crypto/ecc_curve.h>
+
/* One digit is u64 qword. */
#define ECC_CURVE_NIST_P192_DIGITS 3
#define ECC_CURVE_NIST_P256_DIGITS 4
@@ -33,44 +35,9 @@

#define ECC_DIGITS_TO_BYTES_SHIFT 3

-/**
- * struct ecc_point - elliptic curve point in affine coordinates
- *
- * @x: X coordinate in vli form.
- * @y: Y coordinate in vli form.
- * @ndigits: Length of vlis in u64 qwords.
- */
-struct ecc_point {
- u64 *x;
- u64 *y;
- u8 ndigits;
-};
-
#define ECC_POINT_INIT(x, y, ndigits) (struct ecc_point) { x, y, ndigits }

/**
- * struct ecc_curve - definition of elliptic curve
- *
- * @name: Short name of the curve.
- * @g: Generator point of the curve.
- * @p: Prime number, if Barrett's reduction is used for this curve
- * pre-calculated value 'mu' is appended to the @p after ndigits.
- * Use of Barrett's reduction is heuristically determined in
- * vli_mmod_fast().
- * @n: Order of the curve group.
- * @a: Curve parameter a.
- * @b: Curve parameter b.
- */
-struct ecc_curve {
- char *name;
- struct ecc_point g;
- u64 *p;
- u64 *n;
- u64 *a;
- u64 *b;
-};
-
-/**
* ecc_is_key_valid() - Validate a given ECDH private key
*
* @curve_id: id representing the curve to use
diff --git a/crypto/ecc_curve_defs.h b/crypto/ecc_curve_defs.h
index 69be6c7..b81e580 100644
--- a/crypto/ecc_curve_defs.h
+++ b/crypto/ecc_curve_defs.h
@@ -15,18 +15,20 @@ static u64 nist_p192_a[] = { 0xFFFFFFFFFFFFFFFCull, 0xFFFFFFFFFFFFFFFEull,
0xFFFFFFFFFFFFFFFFull };
static u64 nist_p192_b[] = { 0xFEB8DEECC146B9B1ull, 0x0FA7E9AB72243049ull,
0x64210519E59C80E7ull };
-static struct ecc_curve nist_p192 = {
- .name = "nist_192",
- .g = {
- .x = nist_p192_g_x,
- .y = nist_p192_g_y,
- .ndigits = 3,
- },
- .p = nist_p192_p,
- .n = nist_p192_n,
- .a = nist_p192_a,
- .b = nist_p192_b
-};
+
+/* NIST P-224 */
+static u64 nist_p224_g_x[] = { 0x343280D6115C1D21ull, 0x4A03C1D356C21122ull,
+ 0x6BB4BF7F321390B9ull, 0xB70E0CBDull };
+static u64 nist_p224_g_y[] = { 0x44d5819985007e34ull, 0xcd4375a05a074764ull,
+ 0xb5f723fb4c22dfe6ull, 0xbd376388ull };
+static u64 nist_p224_p[] = { 0x0000000000000001ull, 0xFFFFFFFF00000000ull,
+ 0xFFFFFFFFFFFFFFFFull, 0xFFFFFFFFull };
+static u64 nist_p224_n[] = { 0x13DD29455C5C2A3Dull, 0xFFFF16A2E0B8F03Eull,
+ 0xFFFFFFFFFFFFFFFFull, 0xFFFFFFFFull };
+static u64 nist_p224_a[] = { 0xFFFFFFFFFFFFFFFEull, 0xFFFFFFFEFFFFFFFFull,
+ 0xFFFFFFFFFFFFFFFFull, 0xFFFFFFFFull };
+static u64 nist_p224_b[] = { 0x270B39432355FFB4ull, 0x5044B0B7D7BFD8BAull,
+ 0x0C04B3ABF5413256ull, 0xB4050A85ull };

/* NIST P-256: a = p - 3 */
static u64 nist_p256_g_x[] = { 0xF4A13945D898C296ull, 0x77037D812DEB33A0ull,
@@ -41,17 +43,121 @@ static u64 nist_p256_a[] = { 0xFFFFFFFFFFFFFFFCull, 0x00000000FFFFFFFFull,
0x0000000000000000ull, 0xFFFFFFFF00000001ull };
static u64 nist_p256_b[] = { 0x3BCE3C3E27D2604Bull, 0x651D06B0CC53B0F6ull,
0xB3EBBD55769886BCull, 0x5AC635D8AA3A93E7ull };
-static struct ecc_curve nist_p256 = {
- .name = "nist_256",
- .g = {
- .x = nist_p256_g_x,
- .y = nist_p256_g_y,
- .ndigits = 4,
- },
- .p = nist_p256_p,
- .n = nist_p256_n,
- .a = nist_p256_a,
- .b = nist_p256_b
+
+
+/* NIST P-384: a = p - 3 */
+static u64 nist_p384_g_x[] = { 0x3A545E3872760AB7ull, 0x5502F25DBF55296Cull,
+ 0x59F741E082542A38ull, 0x6E1D3B628BA79B98ull,
+ 0x8EB1C71EF320AD74ull, 0xAA87CA22BE8B0537ull};
+static u64 nist_p384_g_y[] = { 0x7A431D7C90EA0E5Full, 0x0A60B1CE1D7E819Dull,
+ 0xE9DA3113B5F0B8C0ull, 0xF8F41DBD289A147Cull,
+ 0x5D9E98BF9292DC29ull, 0x3617DE4A96262C6Full};
+static u64 nist_p384_p[] = { 0x00000000FFFFFFFFull, 0xFFFFFFFF00000000ull,
+ 0xFFFFFFFFFFFFFFFEull, 0xFFFFFFFFFFFFFFFFull,
+ 0xFFFFFFFFFFFFFFFFull, 0xFFFFFFFFFFFFFFFFull};
+static u64 nist_p384_n[] = { 0xECEC196ACCC52973ull, 0x581A0DB248B0A77Aull,
+ 0xC7634D81F4372DDFull, 0xFFFFFFFFFFFFFFFFull,
+ 0xFFFFFFFFFFFFFFFFull, 0xFFFFFFFFFFFFFFFFull};
+static u64 nist_p384_a[] = { 0x00000000FFFFFFFCull, 0xFFFFFFFF00000000ull,
+ 0xFFFFFFFFFFFFFFFEull, 0xFFFFFFFFFFFFFFFFull,
+ 0xFFFFFFFFFFFFFFFFull, 0xFFFFFFFFFFFFFFFFull};
+static u64 nist_p384_b[] = { 0x2A85C8EDD3EC2AEFull, 0xC656398D8A2ED19Dull,
+ 0x0314088F5013875Aull, 0x181D9C6EFE814112ull,
+ 0x988E056BE3F82D19ull, 0xB3312FA7E23EE7E4ull};
+
+/* NIST P-521: a = p - 3 */
+static u64 nist_p521_g_x[] = { 0xF97E7E31C2E5BD66ull, 0x3348B3C1856A429Bull,
+ 0xFE1DC127A2FFA8DEull, 0xA14B5E77EFE75928ull,
+ 0xF828AF606B4D3DBAull, 0x9C648139053FB521ull,
+ 0x9E3ECB662395B442ull, 0x858E06B70404E9CDull,
+ 0x00C6ull };
+static u64 nist_p521_g_y[] = { 0x88be94769fd16650ull, 0x353c7086a272c240ull,
+ 0xc550b9013fad0761ull, 0x97ee72995ef42640ull,
+ 0x17afbd17273e662cull, 0x98f54449579b4468ull,
+ 0x5c8a5fb42c7d1bd9ull, 0x39296a789a3bc004ull,
+ 0x0118ull };
+static u64 nist_p521_p[] = {0xFFFFFFFFFFFFFFFFull, 0xFFFFFFFFFFFFFFFFull,
+ 0xFFFFFFFFFFFFFFFFull, 0xFFFFFFFFFFFFFFFFull,
+ 0xFFFFFFFFFFFFFFFFull, 0xFFFFFFFFFFFFFFFFull,
+ 0xFFFFFFFFFFFFFFFFull, 0xFFFFFFFFFFFFFFFFull,
+ 0x01FFull };
+static u64 nist_p521_n[] = { 0xBB6FB71E91386409ull, 0x3BB5C9B8899C47AEull,
+ 0x7FCC0148F709A5D0ull, 0x51868783BF2F966Bull,
+ 0xFFFFFFFFFFFFFFFAull, 0xFFFFFFFFFFFFFFFFull,
+ 0xFFFFFFFFFFFFFFFFull, 0xFFFFFFFFFFFFFFFFull,
+ 0x01FFull };
+static u64 nist_p521_a[] = { 0xFFFFFFFFFFFFFFFCull, 0xFFFFFFFFFFFFFFFFull,
+ 0xFFFFFFFFFFFFFFFFull, 0xFFFFFFFFFFFFFFFFull,
+ 0xFFFFFFFFFFFFFFFFull, 0xFFFFFFFFFFFFFFFFull,
+ 0xFFFFFFFFFFFFFFFFull, 0xFFFFFFFFFFFFFFFFull,
+ 0x01FFull };
+static u64 nist_p521_b[] = { 0xEF451FD46B503F00ull, 0x3573DF883D2C34F1ull,
+ 0x1652C0BD3BB1BF07ull, 0x56193951EC7E937Bull,
+ 0xB8B489918EF109E1ull, 0xA2DA725B99B315F3ull,
+ 0x929A21A0B68540EEull, 0x953EB9618E1C9A1Full,
+ 0x0051ull };
+
+/**
+ * 'ecc_curve_list' is ordered as 'Curves IDs'
+ * defined in "include/crypto/ecdh.h"
+ */
+static const struct ecc_curve ecc_curve_list[] = {
+ {
+ .name = "nist_192",
+ .g = {
+ .x = nist_p192_g_x,
+ .y = nist_p192_g_y,
+ .ndigits = 3,
+ },
+ .p = nist_p192_p,
+ .n = nist_p192_n,
+ .a = nist_p192_a,
+ .b = nist_p192_b,
+ }, {
+ .name = "nist_224",
+ .g = {
+ .x = nist_p224_g_x,
+ .y = nist_p224_g_y,
+ .ndigits = 4,
+ },
+ .p = nist_p224_p,
+ .n = nist_p224_n,
+ .a = nist_p224_a,
+ .b = nist_p224_b,
+ }, {
+ .name = "nist_256",
+ .g = {
+ .x = nist_p256_g_x,
+ .y = nist_p256_g_y,
+ .ndigits = 4,
+ },
+ .p = nist_p256_p,
+ .n = nist_p256_n,
+ .a = nist_p256_a,
+ .b = nist_p256_b,
+ }, {
+ .name = "nist_384",
+ .g = {
+ .x = nist_p384_g_x,
+ .y = nist_p384_g_y,
+ .ndigits = 6,
+ },
+ .p = nist_p384_p,
+ .n = nist_p384_n,
+ .a = nist_p384_a,
+ .b = nist_p384_b,
+ }, {
+ .name = "nist_521",
+ .g = {
+ .x = nist_p521_g_x,
+ .y = nist_p521_g_y,
+ .ndigits = 9,
+ },
+ .p = nist_p521_p,
+ .n = nist_p521_n,
+ .a = nist_p521_a,
+ .b = nist_p521_b,
+ }
};

#endif
diff --git a/crypto/testmgr.h b/crypto/testmgr.h
index 8c83811..7fe0fb9 100644
--- a/crypto/testmgr.h
+++ b/crypto/testmgr.h
@@ -2307,12 +2307,12 @@ static const struct kpp_testvec ecdh_tv_template[] = {
#ifdef __LITTLE_ENDIAN
"\x02\x00" /* type */
"\x28\x00" /* len */
- "\x02\x00" /* curve_id */
+ "\x03\x00" /* curve_id */
"\x20\x00" /* key_size */
#else
"\x00\x02" /* type */
"\x00\x28" /* len */
- "\x00\x02" /* curve_id */
+ "\x00\x03" /* curve_id */
"\x00\x20" /* key_size */
#endif
"\x24\xd1\x21\xeb\xe5\xcf\x2d\x83"
@@ -2351,24 +2351,24 @@ static const struct kpp_testvec ecdh_tv_template[] = {
#ifdef __LITTLE_ENDIAN
"\x02\x00" /* type */
"\x08\x00" /* len */
- "\x02\x00" /* curve_id */
+ "\x03\x00" /* curve_id */
"\x00\x00", /* key_size */
#else
"\x00\x02" /* type */
"\x00\x08" /* len */
- "\x00\x02" /* curve_id */
+ "\x00\x03" /* curve_id */
"\x00\x00", /* key_size */
#endif
.b_secret =
#ifdef __LITTLE_ENDIAN
"\x02\x00" /* type */
"\x28\x00" /* len */
- "\x02\x00" /* curve_id */
+ "\x03\x00" /* curve_id */
"\x20\x00" /* key_size */
#else
"\x00\x02" /* type */
"\x00\x28" /* len */
- "\x00\x02" /* curve_id */
+ "\x00\x03" /* curve_id */
"\x00\x20" /* key_size */
#endif
"\x24\xd1\x21\xeb\xe5\xcf\x2d\x83"
diff --git a/include/crypto/ecc_curve.h b/include/crypto/ecc_curve.h
new file mode 100644
index 0000000..a3adf1e
--- /dev/null
+++ b/include/crypto/ecc_curve.h
@@ -0,0 +1,53 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* Copyright (c) 2021 HiSilicon Limited. */
+
+#ifndef _CRYTO_ECC_CURVE_H
+#define _CRYTO_ECC_CURVE_H
+
+#include <linux/types.h>
+
+/**
+ * struct ecc_point - elliptic curve point in affine coordinates
+ *
+ * @x: X coordinate in vli form.
+ * @y: Y coordinate in vli form.
+ * @ndigits: Length of vlis in u64 qwords.
+ */
+struct ecc_point {
+ u64 *x;
+ u64 *y;
+ u8 ndigits;
+};
+
+/**
+ * struct ecc_curve - definition of elliptic curve
+ *
+ * @name: Short name of the curve.
+ * @g: Generator point of the curve.
+ * @p: Prime number, if Barrett's reduction is used for this curve
+ * pre-calculated value 'mu' is appended to the @p after ndigits.
+ * Use of Barrett's reduction is heuristically determined in
+ * vli_mmod_fast().
+ * @n: Order of the curve group.
+ * @a: Curve parameter a.
+ * @b: Curve parameter b.
+ */
+struct ecc_curve {
+ char *name;
+ struct ecc_point g;
+ u64 *p;
+ u64 *n;
+ u64 *a;
+ u64 *b;
+};
+
+/**
+ * ecc_get_curve_by_id() - get elliptic curve;
+ * @curve_id: Curves IDs:
+ * defined in "include/crypto/ecc_curve.h";
+ *
+ * Returns curve if get curve succssful, NULL otherwise
+ */
+const struct ecc_curve *ecc_get_curve_by_id(unsigned int curve_id);
+
+#endif
\ No newline at end of file
diff --git a/include/crypto/ecdh.h b/include/crypto/ecdh.h
index a5b805b..741d18a 100644
--- a/include/crypto/ecdh.h
+++ b/include/crypto/ecdh.h
@@ -24,7 +24,10 @@

/* Curves IDs */
#define ECC_CURVE_NIST_P192 0x0001
-#define ECC_CURVE_NIST_P256 0x0002
+#define ECC_CURVE_NIST_P224 0x0002
+#define ECC_CURVE_NIST_P256 0x0003
+#define ECC_CURVE_NIST_P384 0x0004
+#define ECC_CURVE_NIST_P521 0x0005

/**
* struct ecdh - define an ECDH private key
--
2.8.1