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

[Raymond Mao]

Hi Philippe,

On Fri, Apr 17, 2026 at 9:02 AM Philippe Reynes
<philippe.reynes at softathome.com> wrote:
>
> 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

As Simon already pointed out, please use 'CONFIG_$(PHASE_)ECDSA_MBEDTLS'.
With this change applied,
Reviewed-by: Raymond Mao <raymondmaoca at gmail.com>

Thanks and regards,
Raymond

> 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
>