[PATCH v4 04/14] drivers: crypto: add software ecdsa support

[Philippe Reynes]

Add a software ecdsa driver so it is
now possible to use ecdsa signature on
board without ecdsa hardware support.

Signed-off-by: Philippe Reynes <philippe.reynes at softathome.com>
---
v2:
- no change
v3:
- add depends on ECDSA_VERIFY to ECDSA_SW
- change sw_ecdsa_verify to ecdsa_hash_verify
- v4
- use ECDSA_MBEDTLS to build the driver
- clean include (change order)

 drivers/crypto/Makefile         |  1 +
 drivers/crypto/ecdsa/Makefile   |  6 ++++++
 drivers/crypto/ecdsa/ecdsa-sw.c | 33 +++++++++++++++++++++++++++++++++
 3 files changed, 40 insertions(+)
 create mode 100644 drivers/crypto/ecdsa/Makefile
 create mode 100644 drivers/crypto/ecdsa/ecdsa-sw.c

diff --git a/drivers/crypto/Makefile b/drivers/crypto/Makefile
index e4a4482b7f3..8170e4cae9c 100644
--- a/drivers/crypto/Makefile
+++ b/drivers/crypto/Makefile
@@ -4,6 +4,7 @@
 #	http://www.samsung.com
 
 obj-$(CONFIG_EXYNOS_ACE_SHA)	+= ace_sha.o
+obj-$(CONFIG_ECDSA) += ecdsa/
 obj-y += aes/
 obj-y += rsa_mod_exp/
 obj-y += fsl/
diff --git a/drivers/crypto/ecdsa/Makefile b/drivers/crypto/ecdsa/Makefile
new file mode 100644
index 00000000000..53456d9cb4c
--- /dev/null
+++ b/drivers/crypto/ecdsa/Makefile
@@ -0,0 +1,6 @@
+# SPDX-License-Identifier: GPL-2.0+
+#
+# Copyright (C) 2026 Philippe Reynes <philippe.reynes at softathome.com>
+#
+
+obj-$(CONFIG_ECDSA_MBEDTLS) += ecdsa-sw.o
diff --git a/drivers/crypto/ecdsa/ecdsa-sw.c b/drivers/crypto/ecdsa/ecdsa-sw.c
new file mode 100644
index 00000000000..21dffeddf59
--- /dev/null
+++ b/drivers/crypto/ecdsa/ecdsa-sw.c
@@ -0,0 +1,33 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2026 Philippe Reynes <philippe.reynes at softathome.com>
+ */
+#include <crypto/ecdsa-uclass.h>
+#include <crypto/internal/ecdsa.h>
+#include <dm.h>
+#include <linux/types.h>
+#include <u-boot/ecdsa.h>
+
+static int ops_sw_ecdsa_verify(__always_unused struct udevice *dev,
+			       const struct ecdsa_public_key *pubkey,
+			       const void *hash, size_t hash_len,
+			       const void *signature, size_t sig_len)
+{
+	return ecdsa_hash_verify(pubkey, hash, hash_len, signature, sig_len);
+}
+
+static const struct ecdsa_ops sw_ecdsa_ops = {
+	.verify = ops_sw_ecdsa_verify,
+};
+
+U_BOOT_DRIVER(sw_ecdsa) = {
+	.name	= "sw_ecdsa",
+	.id	= UCLASS_ECDSA,
+	.ops	= &sw_ecdsa_ops,
+	.flags	= DM_FLAG_PRE_RELOC,
+};
+
+U_BOOT_DRVINFO(sw_ecdsa) = {
+	.name = "sw_ecdsa",
+};
+
-- 
2.43.0