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Subject[PATCH v9 4/7] crypto: and expose ecc curves
Date
Move 'ecc_get_curve' to 'include/crypto/ecc_curve.h', so everyone
in kernel tree can easily get ecc curve params;

Signed-off-by: Meng Yu <yumeng18@huawei.com>
Reviewed-by: Zaibo Xu <xuzaibo@huawei.com>
---
crypto/ecc.c | 5 ++++-
crypto/ecc.h | 37 ++------------------------------
include/crypto/ecc_curve.h | 53 ++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 59 insertions(+), 36 deletions(-)
create mode 100644 include/crypto/ecc_curve.h

diff --git a/crypto/ecc.c b/crypto/ecc.c
index c80aa25..4b55ad0 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>
@@ -42,7 +43,8 @@ typedef struct {
u64 m_high;
} uint128_t;

-static inline const struct ecc_curve *ecc_get_curve(unsigned int curve_id)
+
+const struct ecc_curve *ecc_get_curve(unsigned int curve_id)
{
switch (curve_id) {
/* In FIPS mode only allow P256 and higher */
@@ -54,6 +56,7 @@ static inline const struct ecc_curve *ecc_get_curve(unsigned int curve_id)
return NULL;
}
}
+EXPORT_SYMBOL(ecc_get_curve);

static u64 *ecc_alloc_digits_space(unsigned int ndigits)
{
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/include/crypto/ecc_curve.h b/include/crypto/ecc_curve.h
new file mode 100644
index 0000000..19a35da
--- /dev/null
+++ b/include/crypto/ecc_curve.h
@@ -0,0 +1,53 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* Copyright (c) 2021 HiSilicon */
+
+#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() - get elliptic curve;
+ * @curve_id: Curves IDs:
+ * defined in 'include/crypto/ecdh.h';
+ *
+ * Returns curve if get curve succssful, NULL otherwise
+ */
+const struct ecc_curve *ecc_get_curve(unsigned int curve_id);
+
+#endif
--
2.8.1
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