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From: Lukas Wunner <lukas@wunner.de>
To: Sascha Hauer <s.hauer@pengutronix.de>
Cc: Barebox List <barebox@lists.infradead.org>,
	Ahmad Fatoum <a.fatoum@pengutronix.de>
Subject: Re: [PATCH v4 14/16] Add elliptic curve cryptography (ECC) helper functions
Date: Wed, 13 May 2026 20:13:49 +0200	[thread overview]
Message-ID: <agS_XfdyvX_1q9dt@wunner.de> (raw)
In-Reply-To: <20240913075924.1652866-15-s.hauer@pengutronix.de>

On Fri, Sep 13, 2024 at 09:59:22AM +0200, Sascha Hauer wrote:
> +++ b/crypto/ecc.c
[...]
> +		for (i = min; i <= k && i < ndigits; i++) {
> +			uint128_t product;
> +
> +			product = mul_64_64(left[i], right[k - i]);
> +
> +			r01 = add_128_128(r01, product);
> +			r2 += (r01.m_high < product.m_high);
> +		}

Heads-up, this barebox code was copy-pasted from the kernel,
which in turn copy-pasted it from Ken MacKay's micro-ecc
library.  The kernel version has a bug in carry handling
which barebox inherited:

https://lore.kernel.org/r/20260513105741.55534-1-sv3iry@gmail.com/

There might be further bugs that were fixed in the kernel but
not in barebox.

Thanks,

Lukas



  reply	other threads:[~2026-05-13 18:25 UTC|newest]

Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-09-13  7:59 [PATCH v4 00/16] Add ECDSA support for FIT image verification Sascha Hauer
2024-09-13  7:59 ` [PATCH v4 01/16] keytoc: remove ECDSA dts support Sascha Hauer
2024-09-25  8:53   ` Ahmad Fatoum
2024-09-13  7:59 ` [PATCH v4 02/16] keytoc: fail in case gen_key() fails Sascha Hauer
2024-09-25  8:53   ` Ahmad Fatoum
2024-09-13  7:59 ` [PATCH v4 03/16] keytoc: fix ECDSA endianess problems Sascha Hauer
2024-09-27  8:11   ` Ahmad Fatoum
2024-09-13  7:59 ` [PATCH v4 04/16] keytoc: remove duplicate __ENV__ check Sascha Hauer
2024-09-27  6:59   ` Ahmad Fatoum
2024-09-13  7:59 ` [PATCH v4 05/16] crypto: Makefile: make simpler Sascha Hauer
2024-09-27  7:01   ` Ahmad Fatoum
2024-09-13  7:59 ` [PATCH v4 06/16] crypto/Makefile: Drop unnecessary dependencies Sascha Hauer
2024-09-27  7:03   ` Ahmad Fatoum
2024-09-13  7:59 ` [PATCH v4 07/16] keytoc: make key name hint optional Sascha Hauer
2024-09-27  8:18   ` Ahmad Fatoum
2024-09-13  7:59 ` [PATCH v4 08/16] crypto: rsa: include key name hint into CONFIG_CRYPTO_RSA_KEY Sascha Hauer
2024-09-27  7:55   ` Ahmad Fatoum
2024-09-13  7:59 ` [PATCH v4 09/16] crypto: rsa: encapsulate rsa keys in public keys struct Sascha Hauer
2024-09-27  8:02   ` Ahmad Fatoum
2024-09-27 11:11     ` Sascha Hauer
2024-09-13  7:59 ` [PATCH v4 10/16] crypto: add public_key functions Sascha Hauer
2024-09-27  8:20   ` Ahmad Fatoum
2024-09-13  7:59 ` [PATCH v4 11/16] crypto: builtin_keys: Allow to specify multiple keys in CONFIG_CRYPTO_PUBLIC_KEYS Sascha Hauer
2024-09-25  8:22   ` Sascha Hauer
2024-09-13  7:59 ` [PATCH v4 12/16] crypto: public-keys: use array of public_keys Sascha Hauer
2024-09-13  7:59 ` [PATCH v4 13/16] crypto: rsa: create static inline wrapper for rsa_verify() Sascha Hauer
2024-09-27  8:09   ` Ahmad Fatoum
2024-09-13  7:59 ` [PATCH v4 14/16] Add elliptic curve cryptography (ECC) helper functions Sascha Hauer
2026-05-13 18:13   ` Lukas Wunner [this message]
2026-05-18  7:58     ` Jonas Rebmann
2024-09-13  7:59 ` [PATCH v4 15/16] crypto: add ECDSA support Sascha Hauer
2024-09-27  8:07   ` Ahmad Fatoum
2024-09-13  7:59 ` [PATCH v4 16/16] crypto: make RSA a visible option Sascha Hauer
2024-09-27 11:23 ` [PATCH v4 00/16] Add ECDSA support for FIT image verification Sascha Hauer
2024-09-27 11:23   ` Sascha Hauer

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