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Thu, 15 Feb 2024 23:14:31 +0000 Received: from smtpav04.wdc07v.mail.ibm.com (smtpav04.wdc07v.mail.ibm.com [10.39.53.231]) by smtprelay05.dal12v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 41FNEStd20709930 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 15 Feb 2024 23:14:31 GMT Received: from smtpav04.wdc07v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id AB69E58054; Thu, 15 Feb 2024 23:14:28 +0000 (GMT) Received: from smtpav04.wdc07v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id F1C6058050; Thu, 15 Feb 2024 23:14:27 +0000 (GMT) Received: from sbct-3.pok.ibm.com (unknown [9.47.158.153]) by smtpav04.wdc07v.mail.ibm.com (Postfix) with ESMTP; Thu, 15 Feb 2024 23:14:27 +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 v2 10/14] crypto: ecc - Implement ecc_digits_to_bytes to convert digits to byte array Date: Thu, 15 Feb 2024 18:14:09 -0500 Message-ID: <20240215231414.3857320-11-stefanb@linux.ibm.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240215231414.3857320-1-stefanb@linux.ibm.com> References: <20240215231414.3857320-1-stefanb@linux.ibm.com> Precedence: bulk X-Mailing-List: keyrings@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: cTTdaRoLdlx0xsX8gtPrGlw2PQ6VnaQg X-Proofpoint-GUID: cTTdaRoLdlx0xsX8gtPrGlw2PQ6VnaQg 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=2024-02-15_22,2024-02-14_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 suspectscore=0 spamscore=0 mlxscore=0 clxscore=1015 impostorscore=0 phishscore=0 priorityscore=1501 adultscore=0 bulkscore=0 mlxlogscore=999 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2311290000 definitions=main-2402150181 Implement ecc_digits_to_bytes to convert an array of digits 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 b8ca5023b3b5..6229aa3f3218 100644 --- a/include/crypto/internal/ecc.h +++ b/include/crypto/internal/ecc.h @@ -75,6 +75,24 @@ static inline void ecc_digits_from_bytes(const u8 *in, unsigned int nbytes, ecc_swap_digits(tmp, out, ndigits); } +/** + * ecc_digits_to_bytes() - Copy digits into a byte array of size nbytes + * @in: Input digits array + * @ndigits: Number of digits in input digits array + * @out: Output byte array + * @nbytes: Number of bytes to copy into byte array + */ +static inline void ecc_digits_to_bytes(const u64 *in, unsigned int ndigits, + u8 *out, unsigned int nbytes) +{ + unsigned int sz = ndigits << ECC_DIGITS_TO_BYTES_SHIFT; + u8 tmp[ECC_MAX_DIGITS << ECC_DIGITS_TO_BYTES_SHIFT]; + 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 *