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Subject[PATCH v8 8/9] crypto: add curve25519 params and expose them
Date
1. Add curve 25519 parameters;
2. Add curve25519 function 'ecc_get_curve25519_param', to make
its parameters be exposed to everyone in kernel tree.

Signed-off-by: Meng Yu <yumeng18@huawei.com>
Reviewed-by: Zaibo Xu <xuzaibo@huawei.com>
---
crypto/ecc.c | 6 ++++++
crypto/ecc_curve_defs.h | 18 ++++++++++++++++++
include/crypto/ecc_curve.h | 7 +++++++
3 files changed, 31 insertions(+)

diff --git a/crypto/ecc.c b/crypto/ecc.c
index a631d3e..d8dbe7a 100644
--- a/crypto/ecc.c
+++ b/crypto/ecc.c
@@ -43,6 +43,12 @@ typedef struct {
u64 m_high;
} uint128_t;

+/* Returns curv25519 curve param */
+const struct ecc_curve *ecc_get_curve25519(void)
+{
+ return &ecc_25519;
+}
+EXPORT_SYMBOL(ecc_get_curve25519);

const struct ecc_curve *ecc_get_curve(unsigned int curve_id)
{
diff --git a/crypto/ecc_curve_defs.h b/crypto/ecc_curve_defs.h
index bcd7b58..f37eced 100644
--- a/crypto/ecc_curve_defs.h
+++ b/crypto/ecc_curve_defs.h
@@ -160,4 +160,22 @@ static struct ecc_curve nist_p521 = {
.b = nist_p521_b
};

+/* curve25519 */
+static u64 curve25519_g_x[] = { 0x0000000000000009, 0x0000000000000000,
+ 0x0000000000000000, 0x0000000000000000 };
+static u64 curve25519_p[] = { 0xffffffffffffffed, 0xffffffffffffffff,
+ 0xffffffffffffffff, 0x7fffffffffffffff };
+static u64 curve25519_a[] = { 0x000000000001DB41, 0x0000000000000000,
+ 0x0000000000000000, 0x0000000000000000 };
+static const struct ecc_curve ecc_25519 = {
+ .name = "curve25519",
+ .g = {
+ .x = curve25519_g_x,
+ .ndigits = 4,
+ },
+ .p = curve25519_p,
+ .a = curve25519_a,
+};
+
+
#endif
diff --git a/include/crypto/ecc_curve.h b/include/crypto/ecc_curve.h
index 19a35da..7096478 100644
--- a/include/crypto/ecc_curve.h
+++ b/include/crypto/ecc_curve.h
@@ -50,4 +50,11 @@ struct ecc_curve {
*/
const struct ecc_curve *ecc_get_curve(unsigned int curve_id);

+/**
+ * ecc_get_curve25519() - get curve25519 curve;
+ *
+ * Returns curve25519
+ */
+const struct ecc_curve *ecc_get_curve25519(void);
+
#endif
--
2.8.1
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