From: Lukas Wunner <lukas@wunner.de>
To: Stefan Berger <stefanb@linux.ibm.com>
Cc: keyrings@vger.kernel.org, linux-crypto@vger.kernel.org,
herbert@gondor.apana.org.au, davem@davemloft.net,
linux-kernel@vger.kernel.org, saulo.alessandre@tse.jus.br
Subject: Re: [PATCH v4 11/12] crypto: asymmetric_keys - Adjust signature size calculation for NIST P521
Date: Sun, 3 Mar 2024 19:47:45 +0100 [thread overview]
Message-ID: <20240303184745.GA9392@wunner.de> (raw)
In-Reply-To: <20240301022007.344948-12-stefanb@linux.ibm.com>
On Thu, Feb 29, 2024 at 09:20:06PM -0500, Stefan Berger wrote:
> Adjust the calculation of the maximum signature size for support of
> NIST P521. While existing curves may prepend a 0 byte to their coordinates
> (to make the number positive), NIST P521 will not do this since only the
> first bit in the most significant byte is used.
>
> If the encoding of the x & y coordinates requires more than 128 bytes then
> an additional byte is needed for the encoding of the length. Take this into
> account when calculating the maximum signature size.
>
> Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
Reviewed-by: Lukas Wunner <lukas@wunner.de>
next prev parent reply other threads:[~2024-03-03 18:47 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-03-01 2:19 [PATCH v4 00/12] Add support for NIST P521 to ecdsa Stefan Berger
2024-03-01 2:19 ` [PATCH v4 01/12] crypto: ecdsa - Convert byte arrays with key coordinates to digits Stefan Berger
2024-03-01 20:36 ` Jarkko Sakkinen
2024-03-02 21:34 ` Lukas Wunner
2024-03-03 6:37 ` James Bottomley
2024-03-03 16:34 ` Stefan Berger
2024-03-01 2:19 ` [PATCH v4 02/12] crypto: ecdsa - Adjust tests on length of key parameters Stefan Berger
2024-03-01 2:19 ` [PATCH v4 03/12] crypto: ecdsa - Extend res.x mod n calculation for NIST P521 Stefan Berger
2024-03-01 2:19 ` [PATCH v4 04/12] crypto: ecc - Implement vli_mmod_fast_521 for NIST p521 Stefan Berger
2024-03-03 11:05 ` Lukas Wunner
2024-03-03 16:29 ` Stefan Berger
2024-03-01 2:20 ` [PATCH v4 05/12] crypto: ecc - Add nbits field to ecc_curve structure Stefan Berger
2024-03-03 11:07 ` Lukas Wunner
2024-03-03 16:32 ` Stefan Berger
2024-03-01 2:20 ` [PATCH v4 06/12] crypto: ecc - Add special case for NIST P521 in ecc_point_mult Stefan Berger
2024-03-01 2:20 ` [PATCH v4 07/12] crypto: ecc - Add NIST P521 curve parameters Stefan Berger
2024-03-01 2:20 ` [PATCH v4 08/12] crypto: ecdsa - Replace ndigits with nbits where precision is needed Stefan Berger
2024-03-01 2:20 ` [PATCH v4 09/12] crypto: ecdsa - Rename keylen to bufsize where necessary Stefan Berger
2024-03-01 20:41 ` Jarkko Sakkinen
2024-03-01 20:47 ` Stefan Berger
2024-03-01 20:50 ` Jarkko Sakkinen
2024-03-01 21:20 ` Stefan Berger
2024-03-01 2:20 ` [PATCH v4 10/12] crypto: ecdsa - Register NIST P521 and extend test suite Stefan Berger
2024-03-01 2:20 ` [PATCH v4 11/12] crypto: asymmetric_keys - Adjust signature size calculation for NIST P521 Stefan Berger
2024-03-03 18:47 ` Lukas Wunner [this message]
2024-03-03 21:03 ` Stefan Berger
2024-03-01 2:20 ` [PATCH v4 12/12] crypto: x509 - Add OID for NIST P521 and extend parser for it Stefan Berger
2024-03-04 18:10 ` [PATCH v4 00/12] Add support for NIST P521 to ecdsa Lukas Wunner
2024-03-04 19:01 ` Stefan Berger
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