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Thu, 04 Apr 2024 14:19:41 +0000 Received: from smtpav06.wdc07v.mail.ibm.com (smtpav06.wdc07v.mail.ibm.com [10.39.53.233]) by smtprelay06.dal12v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 434EJcJH32899772 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 4 Apr 2024 14:19:40 GMT Received: from smtpav06.wdc07v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 05D5758055; Thu, 4 Apr 2024 14:19:38 +0000 (GMT) Received: from smtpav06.wdc07v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 1E50958060; Thu, 4 Apr 2024 14:19:37 +0000 (GMT) Received: from sbct-3.pok.ibm.com (unknown [9.47.158.153]) by smtpav06.wdc07v.mail.ibm.com (Postfix) with ESMTP; Thu, 4 Apr 2024 14:19:37 +0000 (GMT) From: Stefan Berger To: keyrings@vger.kernel.org, linux-crypto@vger.kernel.org, herbert@gondor.apana.org.au, davem@davemloft.net Cc: linux-kernel@vger.kernel.org, saulo.alessandre@tse.jus.br, lukas@wunner.de, bbhushan2@marvell.com, jarkko@kernel.org, Stefan Berger Subject: [PATCH v8 07/13] crypto: ecc - Add special case for NIST P521 in ecc_point_mult Date: Thu, 4 Apr 2024 10:18:50 -0400 Message-ID: <20240404141856.2399142-8-stefanb@linux.ibm.com> X-Mailer: git-send-email 2.44.0 In-Reply-To: <20240404141856.2399142-1-stefanb@linux.ibm.com> References: <20240404141856.2399142-1-stefanb@linux.ibm.com> Precedence: bulk X-Mailing-List: linux-crypto@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: TiSuERCaut_CDO71WJhYF06XnjAOdCpC X-Proofpoint-GUID: TiSuERCaut_CDO71WJhYF06XnjAOdCpC X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.1011,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2024-04-04_10,2024-04-04_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 suspectscore=0 mlxlogscore=999 lowpriorityscore=0 bulkscore=0 clxscore=1015 priorityscore=1501 phishscore=0 malwarescore=0 mlxscore=0 spamscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2404010000 definitions=main-2404040098 In ecc_point_mult use the number of bits of the NIST P521 curve + 2. The change is required specifically for NIST P521 to pass mathematical tests on the public key. Tested-by: Lukas Wunner Reviewed-by: Jarkko Sakkinen Signed-off-by: Stefan Berger --- crypto/ecc.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/crypto/ecc.c b/crypto/ecc.c index 90a8c7ea9095..fe2ae2d4185c 100644 --- a/crypto/ecc.c +++ b/crypto/ecc.c @@ -1320,7 +1320,10 @@ static void ecc_point_mult(struct ecc_point *result, carry = vli_add(sk[0], scalar, curve->n, ndigits); vli_add(sk[1], sk[0], curve->n, ndigits); scalar = sk[!carry]; - num_bits = sizeof(u64) * ndigits * 8 + 1; + if (curve->nbits == 521) /* NIST P521 */ + num_bits = curve->nbits + 2; + else + num_bits = sizeof(u64) * ndigits * 8 + 1; vli_set(rx[1], point->x, ndigits); vli_set(ry[1], point->y, ndigits);