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Thu, 08 Feb 2024 22:19:06 +0000 Received: from smtpav03.dal12v.mail.ibm.com (smtpav03.dal12v.mail.ibm.com [10.241.53.102]) by smtprelay07.wdc07v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 418MJ51211469400 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 8 Feb 2024 22:19:05 GMT Received: from smtpav03.dal12v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 8E95658060; Thu, 8 Feb 2024 22:19:05 +0000 (GMT) Received: from smtpav03.dal12v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 1D3B758068; Thu, 8 Feb 2024 22:19:05 +0000 (GMT) Received: from sbct-3.pok.ibm.com (unknown [9.47.158.153]) by smtpav03.dal12v.mail.ibm.com (Postfix) with ESMTP; Thu, 8 Feb 2024 22:19:05 +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, Stefan Berger Subject: [PATCH 10/14] crypto: ecc - Implement ecc_digits_to_array to convert digits to byte array Date: Thu, 8 Feb 2024 17:18:36 -0500 Message-ID: <20240208221840.3665874-11-stefanb@linux.ibm.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240208221840.3665874-1-stefanb@linux.ibm.com> References: <20240208221840.3665874-1-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: Ros67y281KSkCo9nQbnSbrJiRFqenxKQ X-Proofpoint-GUID: Ros67y281KSkCo9nQbnSbrJiRFqenxKQ 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=2024-02-08_11,2024-02-08_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 mlxscore=0 malwarescore=0 mlxlogscore=874 phishscore=0 suspectscore=0 bulkscore=0 spamscore=0 clxscore=1015 priorityscore=1501 impostorscore=0 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2311290000 definitions=main-2402080124 Implement ecc_digits_to_array to convert an array of ndigits into an nbytes-sized byte array. Signed-off-by: Stefan Berger --- include/crypto/internal/ecc.h | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/include/crypto/internal/ecc.h b/include/crypto/internal/ecc.h index 22931f0c7295..75ee113f58f9 100644 --- a/include/crypto/internal/ecc.h +++ b/include/crypto/internal/ecc.h @@ -75,6 +75,24 @@ static inline void ecc_digits_from_array(const u8 *in, unsigned int nbytes, ecc_swap_digits(tmp, out, ndigits); } +/** + * ecc_digits_to_array() - Copy nbytes from an ndigits array into a byte array + * @in: Input digits array + * @ndigits: Number of digits in input digits array + * @out: Output byte array + * @nbytes: Number of digits to create from byte array + */ +static inline void ecc_digits_to_array(const u64 *in, unsigned int ndigits, + u8 *out, unsigned int nbytes) +{ + unsigned int sz = ndigits * sizeof(u64); + u8 tmp[ECC_MAX_DIGITS * sizeof(u64)]; + unsigned int o = sz - nbytes; + + ecc_swap_digits(in, (u64 *)tmp, ndigits); + memcpy(out, &tmp[o], nbytes); +} + /** * ecc_is_key_valid() - Validate a given ECDH private key *