[{"id":3679173,"web_url":"http://patchwork.ozlabs.org/comment/3679173/","msgid":"","list_archive_url":null,"date":"2026-04-20T02:11:19","subject":"Re: [PATCH v4 02/14] ecdsa: initial support of ecdsa using mbedtls","submitter":{"id":6170,"url":"http://patchwork.ozlabs.org/api/people/6170/","name":"Simon Glass","email":"sjg@chromium.org"},"content":"Hi Philippe,\n\nOn 2026-04-17T13:02:04, Philippe Reynes wrote:\n> ecdsa: initial support of ecdsa using mbedtls\n>\n> Adds an initial support of ecdsa verify using mbedtls.\n>\n> Signed-off-by: Philippe Reynes \n>\n> include/crypto/ecdsa-uclass.h | 15 +----\n> include/crypto/internal/ecdsa.h | 28 ++++++++\n> lib/mbedtls/Makefile | 3 +\n> lib/mbedtls/ecdsa.c | 146 ++++++++++++++++++++++++++++++++++++++++\n> 4 files changed, 178 insertions(+), 14 deletions(-)\n\n> diff --git a/lib/mbedtls/ecdsa.c b/lib/mbedtls/ecdsa.c\n> @@ -0,0 +1,146 @@\n> + err = mbedtls_mpi_read_binary(&Q.Y, pubkey->y, key_len);\n> + if (err) {\n> + log_debug(\"could not read value y of the public key (err = %d)\\n\",\n> + err);\n> + err = -EINVAL;\n> + goto out2;\n> + }\n> + mbedtls_mpi_lset(&Q.Z, 1);\n> + if (err) {\n> + log_debug(\"could not set value z of the public key (err = %d)\\n\",\n> + err);\n> + err = -EINVAL;\n> + goto out2;\n> + }\n\nShouldn't this be:\n\n err = mbedtls_mpi_lset(&Q.Z, 1);\n if (err) {\n\n> diff --git a/include/crypto/internal/ecdsa.h b/include/crypto/internal/ecdsa.h\n> @@ -0,0 +1,28 @@\n> +int ecdsa_hash_verify(const struct ecdsa_public_key *pubkey,\n> + const void *hash, size_t hash_len,\n> + const void *signature, size_t sig_len);\n\nPlease can you add a kerneldoc comment documenting the parameters and\nreturn value?\n\nRegards,\nSimon","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=chromium.org header.i=@chromium.org header.a=rsa-sha256\n header.s=google header.b=FKUD/0XA;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.denx.de\n (client-ip=2a01:238:438b:c500:173d:9f52:ddab:ee01; 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Sun, 19 Apr 2026\n 19:11:40 -0700 (PDT)","MIME-Version":"1.0","References":"<20260417130204.49896-1-philippe.reynes@softathome.com>\n <20260417130204.49896-3-philippe.reynes@softathome.com>","In-Reply-To":"<20260417130204.49896-3-philippe.reynes@softathome.com>","From":"Simon Glass ","Date":"Mon, 20 Apr 2026 14:11:19 +1200","X-Gm-Features":"AQROBzCmAax1Ue1ztCqIeWIaUJjupApwK7LZY5HM_conqSuWpsAjDfhz-MrXaTI","Message-ID":"\n ","Subject":"Re: [PATCH v4 02/14] ecdsa: initial support of ecdsa using mbedtls","To":"philippe.reynes@softathome.com","Cc":"marko.makela@iki.fi, jonny.green@keytechinc.com, raymondmaoca@gmail.com,\n trini@konsulko.com, simon.glass@canonical.com, u-boot@lists.denx.de","Content-Type":"text/plain; charset=\"UTF-8\"","X-BeenThere":"u-boot@lists.denx.de","X-Mailman-Version":"2.1.39","Precedence":"list","List-Id":"U-Boot discussion ","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Errors-To":"u-boot-bounces@lists.denx.de","Sender":"\"U-Boot\" ","X-Virus-Scanned":"clamav-milter 0.103.8 at phobos.denx.de","X-Virus-Status":"Clean"}},{"id":3679467,"web_url":"http://patchwork.ozlabs.org/comment/3679467/","msgid":"","list_archive_url":null,"date":"2026-04-20T16:36:23","subject":"Re: [PATCH v4 02/14] ecdsa: initial support of ecdsa using mbedtls","submitter":{"id":91989,"url":"http://patchwork.ozlabs.org/api/people/91989/","name":"Raymond Mao","email":"raymondmaoca@gmail.com"},"content":"Hi Philippe,\n\nOn Fri, Apr 17, 2026 at 9:02 AM Philippe Reynes\n wrote:\n>\n> Adds an initial support of ecdsa verify using mbedtls.\n>\n> Signed-off-by: Philippe Reynes \n> ---\n> v2:\n> - rename sw_ecdsa.c to ecdsa.c\n> v3:\n> - rename sw_ecdsa_verify to ecdsa_hash_verify\n> - stop on first group found\n> - check signature len\n> - use debug instead of printf\n> - check function returns\n> - fix memleaks in ecdsa_hash_verify\n> v4:\n> - move struct ecdsa_public_key from ecdsa-u-class.h to internal/ecdsa.h\n> - use DIV_ROUND_UP\n> - some code cleanup\n>\n> include/crypto/ecdsa-uclass.h | 15 +---\n> include/crypto/internal/ecdsa.h | 28 ++++++\n> lib/mbedtls/Makefile | 3 +\n> lib/mbedtls/ecdsa.c | 146 ++++++++++++++++++++++++++++++++\n> 4 files changed, 178 insertions(+), 14 deletions(-)\n> create mode 100644 include/crypto/internal/ecdsa.h\n> create mode 100644 lib/mbedtls/ecdsa.c\n>\n> diff --git a/include/crypto/ecdsa-uclass.h b/include/crypto/ecdsa-uclass.h\n> index 189843820a0..047a5eda2fc 100644\n> --- a/include/crypto/ecdsa-uclass.h\n> +++ b/include/crypto/ecdsa-uclass.h\n> @@ -4,20 +4,7 @@\n> */\n>\n> #include \n> -\n> -/**\n> - * struct ecdsa_public_key - ECDSA public key properties\n> - *\n> - * The struct has pointers to the (x, y) curve coordinates to an ECDSA public\n> - * key, as well as the name of the ECDSA curve. The size of the key is inferred\n> - * from the 'curve_name'\n> - */\n> -struct ecdsa_public_key {\n> - const char *curve_name; /* Name of curve, e.g. \"prime256v1\" */\n> - const void *x; /* x coordinate of public key */\n> - const void *y; /* y coordinate of public key */\n> - unsigned int size_bits; /* key size in bits, derived from curve name */\n> -};\n> +#include \n>\n> struct ecdsa_ops {\n> /**\n> diff --git a/include/crypto/internal/ecdsa.h b/include/crypto/internal/ecdsa.h\n> new file mode 100644\n> index 00000000000..bfdc137091e\n> --- /dev/null\n> +++ b/include/crypto/internal/ecdsa.h\n> @@ -0,0 +1,28 @@\n> +/* SPDX-License-Identifier: GPL-2.0+ */\n> +/*\n> + * Copyright (c) 2026, Philippe Reynes \n> + */\n> +#ifndef _ECDSA_HELPER_\n> +#define _ECDSA_HELPER_\n> +\n> +#include \n> +\n> +/**\n> + * struct ecdsa_public_key - ECDSA public key properties\n> + *\n> + * The struct has pointers to the (x, y) curve coordinates to an ECDSA public\n> + * key, as well as the name of the ECDSA curve. The size of the key is inferred\n> + * from the 'curve_name'\n> + */\n> +struct ecdsa_public_key {\n> + const char *curve_name; /* Name of curve, e.g. \"prime256v1\" */\n> + const void *x; /* x coordinate of public key */\n> + const void *y; /* y coordinate of public key */\n> + unsigned int size_bits; /* key size in bits, derived from curve name */\n> +};\n> +\n> +int ecdsa_hash_verify(const struct ecdsa_public_key *pubkey,\n> + const void *hash, size_t hash_len,\n> + const void *signature, size_t sig_len);\n> +\n> +#endif\n> diff --git a/lib/mbedtls/Makefile b/lib/mbedtls/Makefile\n> index aa1ca6d196b..d872c0eb788 100644\n> --- a/lib/mbedtls/Makefile\n> +++ b/lib/mbedtls/Makefile\n> @@ -11,6 +11,9 @@ obj-$(CONFIG_$(PHASE_)SHA1_MBEDTLS) += sha1.o\n> obj-$(CONFIG_$(PHASE_)SHA256_MBEDTLS) += sha256.o\n> obj-$(CONFIG_$(PHASE_)SHA512_MBEDTLS) += sha512.o\n>\n> +# shim layer for ecdsa\n> +obj-$(CONFIG_$(PHASE_)ECDSA_MBEDTLS) += ecdsa.o\n> +\n> # x509 libraries\n> obj-$(CONFIG_$(PHASE_)ASYMMETRIC_PUBLIC_KEY_MBEDTLS) += \\\n> public_key.o\n> diff --git a/lib/mbedtls/ecdsa.c b/lib/mbedtls/ecdsa.c\n> new file mode 100644\n> index 00000000000..a87b0d0e17f\n> --- /dev/null\n> +++ b/lib/mbedtls/ecdsa.c\n> @@ -0,0 +1,146 @@\n> +// SPDX-License-Identifier: GPL-2.0+\n> +/*\n> + * Copyright (C) 2026 Philippe Reynes \n> + */\n> +\n> +#include \n> +#include \n> +#include \n> +#include \n> +\n> +#include \n> +\n> +#include \"mbedtls_options.h\" /* required to access private fields */\n> +#include \n> +#include \n> +\n> +static mbedtls_ecp_group_id ecdsa_search_group_id(const char *curve_name)\n> +{\n> + mbedtls_ecp_group_id grp_id = MBEDTLS_ECP_DP_NONE;\n> + const mbedtls_ecp_curve_info *info;\n> +\n> + if (!curve_name)\n> + goto out;\n> +\n> + if (!strcmp(curve_name, \"prime256v1\"))\n> + return MBEDTLS_ECP_DP_SECP256R1;\n> +\n> + info = mbedtls_ecp_curve_list();\n> + while (info && info->name) {\n> + if (!strcmp(curve_name, info->name)) {\n> + grp_id = info->grp_id;\n> + break;\n> + }\n> + info++;\n> + }\n> +\n> + out:\n> + return grp_id;\n> +}\n> +\n> +int ecdsa_hash_verify(const struct ecdsa_public_key *pubkey,\n> + const void *hash, size_t hash_len,\n> + const void *signature, size_t sig_len)\n> +{\n> + mbedtls_ecp_group_id grp_id;\n> + mbedtls_ecp_group grp;\n> + mbedtls_ecp_point Q;\n> + mbedtls_mpi r, s;\n> + int key_len;\n> + int err = -1;\n> +\n> + key_len = DIV_ROUND_UP(pubkey->size_bits, 8);\n> +\n> + /* check the signature len */\n> + if (sig_len != 2 * key_len) {\n> + log_debug(\"sig len should be twice the key len (sig len = %zu, key len = %d)\\n\",\n> + sig_len, key_len);\n> + err = -EINVAL;\n> + goto out;\n> + }\n> +\n> + /* search the group */\n> + grp_id = ecdsa_search_group_id(pubkey->curve_name);\n> + if (grp_id == MBEDTLS_ECP_DP_NONE) {\n> + log_debug(\"curve name %s not found\\n\", pubkey->curve_name);\n> + err = -EINVAL;\n> + goto out;\n> + }\n> +\n> + /* init and load the group */\n> + mbedtls_ecp_group_init(&grp);\n> + err = mbedtls_ecp_group_load(&grp, grp_id);\n> + if (err) {\n> + err = -EINVAL;\n> + goto out1;\n> + }\n> +\n> + /* prepare the pubkey */\n> + mbedtls_ecp_point_init(&Q);\n> + err = mbedtls_mpi_read_binary(&Q.X, pubkey->x, key_len);\n> + if (err) {\n> + log_debug(\"could not read value x of the public key (err = %d)\\n\",\n> + err);\n> + err = -EINVAL;\n> + goto out2;\n> + }\n> + err = mbedtls_mpi_read_binary(&Q.Y, pubkey->y, key_len);\n> + if (err) {\n> + log_debug(\"could not read value y of the public key (err = %d)\\n\",\n> + err);\n> + err = -EINVAL;\n> + goto out2;\n> + }\n> + mbedtls_mpi_lset(&Q.Z, 1);\n\n'err = ' is missing.\n\nRaymond\n\n> + if (err) {\n> + log_debug(\"could not set value z of the public key (err = %d)\\n\",\n> + err);\n> + err = -EINVAL;\n> + goto out2;\n> + }\n> +\n> + /* check if the pubkey is valid */\n> + err = mbedtls_ecp_check_pubkey(&grp, &Q);\n> + if (err) {\n> + log_debug(\"public key is invalid (err = %d)\\n\", err);\n> + err = -EKEYREJECTED;\n> + goto out2;\n> + }\n> +\n> + /* compute r */\n> + mbedtls_mpi_init(&r);\n> + err = mbedtls_mpi_read_binary(&r, signature, key_len);\n> + if (err) {\n> + log_debug(\"could not read value r of the signature (err = %d)\\n\",\n> + err);\n> + err = -EINVAL;\n> + goto out3;\n> + }\n> +\n> + /* compute s */\n> + mbedtls_mpi_init(&s);\n> + err = mbedtls_mpi_read_binary(&s, signature + key_len, key_len);\n> + if (err) {\n> + log_debug(\"could not read value s of the signature (err = %d)\\n\",\n> + err);\n> + err = -EINVAL;\n> + goto out4;\n> + }\n> +\n> + /* check the signature */\n> + err = mbedtls_ecdsa_verify(&grp, hash, hash_len, &Q, &r, &s);\n> + if (err)\n> + err = -EINVAL;\n> +\n> + out4:\n> + mbedtls_mpi_free(&s);\n> + out3:\n> + mbedtls_mpi_free(&r);\n> + out2:\n> + mbedtls_ecp_point_free(&Q);\n> + out1:\n> + mbedtls_ecp_group_free(&grp);\n> + out:\n> +\n> + return err;\n> +}\n> --\n> 2.43.0\n>","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20251104 header.b=Ae5uFHNE;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.denx.de\n (client-ip=2a01:238:438b:c500:173d:9f52:ddab:ee01; helo=phobos.denx.de;\n envelope-from=u-boot-bounces@lists.denx.de; receiver=patchwork.ozlabs.org)","phobos.denx.de;\n dmarc=pass (p=none dis=none) header.from=gmail.com","phobos.denx.de;\n spf=pass smtp.mailfrom=u-boot-bounces@lists.denx.de","phobos.denx.de;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=gmail.com header.i=@gmail.com header.b=\"Ae5uFHNE\";\n\tdkim-atps=neutral","phobos.denx.de;\n dmarc=pass (p=none dis=none) header.from=gmail.com","phobos.denx.de;\n spf=pass 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