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Mon, 15 Apr 2024 00:30:41 +0000 Received: from smtpav01.wdc07v.mail.ibm.com (smtpav01.wdc07v.mail.ibm.com [10.39.53.228]) by smtprelay02.dal12v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 43F0Uefj38928668 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 15 Apr 2024 00:30:40 GMT Received: from smtpav01.wdc07v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 0B8CE5806C; Mon, 15 Apr 2024 00:30:40 +0000 (GMT) Received: from smtpav01.wdc07v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 5482958079; Mon, 15 Apr 2024 00:30:39 +0000 (GMT) Received: from sbct-3.bos2.lab (unknown [9.47.158.153]) by smtpav01.wdc07v.mail.ibm.com (Postfix) with ESMTP; Mon, 15 Apr 2024 00:30:39 +0000 (GMT) From: Stefan Berger To: linux-crypto@vger.kernel.org, herbert@gondor.apana.org.au, davem@davemloft.net Cc: linux-kernel@vger.kernel.org, jarkko@kernel.org, ardb@kernel.org, salvatore.benedetto@intel.com, Stefan Berger Subject: [PATCH 1/2] crypto: ecdh - Pass private key in proper byte order to check valid key Date: Sun, 14 Apr 2024 20:30:25 -0400 Message-ID: <20240415003026.2661270-2-stefanb@linux.ibm.com> X-Mailer: git-send-email 2.44.0 In-Reply-To: <20240415003026.2661270-1-stefanb@linux.ibm.com> References: <20240415003026.2661270-1-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-GUID: ksjlax4eBGmK9uRAyt_qPbArM6uyGbtZ X-Proofpoint-ORIG-GUID: ksjlax4eBGmK9uRAyt_qPbArM6uyGbtZ 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=2024-04-14_10,2024-04-09_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 clxscore=1011 mlxlogscore=999 phishscore=0 mlxscore=0 suspectscore=0 priorityscore=1501 impostorscore=0 lowpriorityscore=0 malwarescore=0 bulkscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2404010000 definitions=main-2404150001 ecc_is_key_valid expects a key with the most significant digit in the last entry of the digit array. Currently ecdh_set_secret passes a reversed key to ecc_is_key_valid that then passes the rather simple test checking whether the private key is in range [2, n-3]. For all current ecdh- supported curves (NIST P192/256/384) the 'n' parameter is a rather large number, therefore easily passing this test. Throughout the ecdh and ecc codebase the variable 'priv' is used for a private_key holding the bytes in proper byte order. Therefore, introduce priv in ecdh_set_secret and copy the bytes from ctx->private_key into priv in proper byte order by using ecc_swap_digits. Pass priv to ecc_is_valid_key. Cc: Ard Biesheuvel Cc: Salvatore Benedetto Signed-off-by: Stefan Berger Acked-by: Jarkko Sakkinen --- crypto/ecdh.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/crypto/ecdh.c b/crypto/ecdh.c index 3049f147e011..a73853bd44de 100644 --- a/crypto/ecdh.c +++ b/crypto/ecdh.c @@ -27,6 +27,7 @@ static int ecdh_set_secret(struct crypto_kpp *tfm, const void *buf, unsigned int len) { struct ecdh_ctx *ctx = ecdh_get_ctx(tfm); + u64 priv[ECC_MAX_DIGITS]; struct ecdh params; if (crypto_ecdh_decode_key(buf, len, ¶ms) < 0 || @@ -40,9 +41,10 @@ static int ecdh_set_secret(struct crypto_kpp *tfm, const void *buf, ctx->private_key); memcpy(ctx->private_key, params.key, params.key_size); + ecc_swap_digits(ctx->private_key, priv, ctx->ndigits); if (ecc_is_key_valid(ctx->curve_id, ctx->ndigits, - ctx->private_key, params.key_size) < 0) { + priv, params.key_size) < 0) { memzero_explicit(ctx->private_key, params.key_size); return -EINVAL; } From patchwork Mon Apr 15 00:30:26 2024 Content-Type: text/plain; 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Mon, 15 Apr 2024 00:30:43 +0000 Received: from smtpav01.wdc07v.mail.ibm.com (smtpav01.wdc07v.mail.ibm.com [10.39.53.228]) by smtprelay02.dal12v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 43F0UfYu36307544 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 15 Apr 2024 00:30:43 GMT Received: from smtpav01.wdc07v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id D7D7358066; Mon, 15 Apr 2024 00:30:40 +0000 (GMT) Received: from smtpav01.wdc07v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 2DC7E58063; Mon, 15 Apr 2024 00:30:40 +0000 (GMT) Received: from sbct-3.bos2.lab (unknown [9.47.158.153]) by smtpav01.wdc07v.mail.ibm.com (Postfix) with ESMTP; Mon, 15 Apr 2024 00:30:40 +0000 (GMT) From: Stefan Berger To: linux-crypto@vger.kernel.org, herbert@gondor.apana.org.au, davem@davemloft.net Cc: linux-kernel@vger.kernel.org, jarkko@kernel.org, ardb@kernel.org, salvatore.benedetto@intel.com, Stefan Berger Subject: [PATCH 2/2] crypto: ecdh & ecc - Initialize ctx->private_key in proper byte order Date: Sun, 14 Apr 2024 20:30:26 -0400 Message-ID: <20240415003026.2661270-3-stefanb@linux.ibm.com> X-Mailer: git-send-email 2.44.0 In-Reply-To: <20240415003026.2661270-1-stefanb@linux.ibm.com> References: <20240415003026.2661270-1-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: GGDON2JQHZ8voxZ8iQ8EyTlf9qJ7PF37 X-Proofpoint-GUID: GGDON2JQHZ8voxZ8iQ8EyTlf9qJ7PF37 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=2024-04-14_10,2024-04-09_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 lowpriorityscore=0 suspectscore=0 priorityscore=1501 spamscore=0 clxscore=1015 malwarescore=0 mlxscore=0 bulkscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2404010000 definitions=main-2404150001 ctx->private_key is currently initialized in reverse byte order in ecdh_set_secret and whenever it is needed in proper byte order the variable priv is introduced and the bytes from ctx->private_key are copied into priv while being byte-swapped (ecc_swap_digits). To get rid of the unnecessary byte swapping initialize ctx->private_key in proper byte order and clean up all functions that were previously using priv or were called with ctx->private_key: - ecc_gen_privkey: Directly initialize the passed ctx->private_key with random bytes and get rid of the priv variable. This function only has ecdh_set_secret as a caller. - crypto_ecdh_shared_secret: Called only from ecdh_compute_value with ctx->private_key. Get rid of the priv variable and work with the passed private_key directly. - ecc_make_pub_key: Called only from ecdh_compute_value with ctx->private_key. Get rid of the priv variable and work with the passed private_key directly. Cc: Salvatore Benedetto Signed-off-by: Stefan Berger --- crypto/ecc.c | 29 ++++++++++------------------- crypto/ecdh.c | 7 +++---- include/crypto/internal/ecc.h | 3 ++- 3 files changed, 15 insertions(+), 24 deletions(-) diff --git a/crypto/ecc.c b/crypto/ecc.c index 2e05387b9499..c1d2e884be1e 100644 --- a/crypto/ecc.c +++ b/crypto/ecc.c @@ -1497,10 +1497,10 @@ EXPORT_SYMBOL(ecc_is_key_valid); * This method generates a private key uniformly distributed in the range * [2, n-3]. */ -int ecc_gen_privkey(unsigned int curve_id, unsigned int ndigits, u64 *privkey) +int ecc_gen_privkey(unsigned int curve_id, unsigned int ndigits, + u64 *private_key) { const struct ecc_curve *curve = ecc_get_curve(curve_id); - u64 priv[ECC_MAX_DIGITS]; unsigned int nbytes = ndigits << ECC_DIGITS_TO_BYTES_SHIFT; unsigned int nbits = vli_num_bits(curve->n, ndigits); int err; @@ -1509,7 +1509,7 @@ int ecc_gen_privkey(unsigned int curve_id, unsigned int ndigits, u64 *privkey) * Step 1 & 2: check that N is included in Table 1 of FIPS 186-5, * section 6.1.1. */ - if (nbits < 224 || ndigits > ARRAY_SIZE(priv)) + if (nbits < 224) return -EINVAL; /* @@ -1527,17 +1527,16 @@ int ecc_gen_privkey(unsigned int curve_id, unsigned int ndigits, u64 *privkey) return -EFAULT; /* Step 3: obtain N returned_bits from the DRBG. */ - err = crypto_rng_get_bytes(crypto_default_rng, (u8 *)priv, nbytes); + err = crypto_rng_get_bytes(crypto_default_rng, + (u8 *)private_key, nbytes); crypto_put_default_rng(); if (err) return err; /* Step 4: make sure the private key is in the valid range. */ - if (__ecc_is_key_valid(curve, priv, ndigits)) + if (__ecc_is_key_valid(curve, private_key, ndigits)) return -EINVAL; - ecc_swap_digits(priv, privkey, ndigits); - return 0; } EXPORT_SYMBOL(ecc_gen_privkey); @@ -1547,23 +1546,20 @@ int ecc_make_pub_key(unsigned int curve_id, unsigned int ndigits, { int ret = 0; struct ecc_point *pk; - u64 priv[ECC_MAX_DIGITS]; const struct ecc_curve *curve = ecc_get_curve(curve_id); - if (!private_key || ndigits > ARRAY_SIZE(priv)) { + if (!private_key) { ret = -EINVAL; goto out; } - ecc_swap_digits(private_key, priv, ndigits); - pk = ecc_alloc_point(ndigits); if (!pk) { ret = -ENOMEM; goto out; } - ecc_point_mult(pk, &curve->g, priv, NULL, curve, ndigits); + ecc_point_mult(pk, &curve->g, private_key, NULL, curve, ndigits); /* SP800-56A rev 3 5.6.2.1.3 key check */ if (ecc_is_pubkey_valid_full(curve, pk)) { @@ -1647,13 +1643,11 @@ int crypto_ecdh_shared_secret(unsigned int curve_id, unsigned int ndigits, { int ret = 0; struct ecc_point *product, *pk; - u64 priv[ECC_MAX_DIGITS]; u64 rand_z[ECC_MAX_DIGITS]; unsigned int nbytes; const struct ecc_curve *curve = ecc_get_curve(curve_id); - if (!private_key || !public_key || - ndigits > ARRAY_SIZE(priv) || ndigits > ARRAY_SIZE(rand_z)) { + if (!private_key || !public_key || ndigits > ARRAY_SIZE(rand_z)) { ret = -EINVAL; goto out; } @@ -1674,15 +1668,13 @@ int crypto_ecdh_shared_secret(unsigned int curve_id, unsigned int ndigits, if (ret) goto err_alloc_product; - ecc_swap_digits(private_key, priv, ndigits); - product = ecc_alloc_point(ndigits); if (!product) { ret = -ENOMEM; goto err_alloc_product; } - ecc_point_mult(product, pk, priv, rand_z, curve, ndigits); + ecc_point_mult(product, pk, private_key, rand_z, curve, ndigits); if (ecc_point_is_zero(product)) { ret = -EFAULT; @@ -1692,7 +1684,6 @@ int crypto_ecdh_shared_secret(unsigned int curve_id, unsigned int ndigits, ecc_swap_digits(product->x, secret, ndigits); err_validity: - memzero_explicit(priv, sizeof(priv)); memzero_explicit(rand_z, sizeof(rand_z)); ecc_free_point(product); err_alloc_product: diff --git a/crypto/ecdh.c b/crypto/ecdh.c index a73853bd44de..c217f2d2d218 100644 --- a/crypto/ecdh.c +++ b/crypto/ecdh.c @@ -27,7 +27,6 @@ static int ecdh_set_secret(struct crypto_kpp *tfm, const void *buf, unsigned int len) { struct ecdh_ctx *ctx = ecdh_get_ctx(tfm); - u64 priv[ECC_MAX_DIGITS]; struct ecdh params; if (crypto_ecdh_decode_key(buf, len, ¶ms) < 0 || @@ -40,11 +39,11 @@ static int ecdh_set_secret(struct crypto_kpp *tfm, const void *buf, return ecc_gen_privkey(ctx->curve_id, ctx->ndigits, ctx->private_key); - memcpy(ctx->private_key, params.key, params.key_size); - ecc_swap_digits(ctx->private_key, priv, ctx->ndigits); + ecc_digits_from_bytes(params.key, params.key_size, + ctx->private_key, ctx->ndigits); if (ecc_is_key_valid(ctx->curve_id, ctx->ndigits, - priv, params.key_size) < 0) { + ctx->private_key, params.key_size) < 0) { memzero_explicit(ctx->private_key, params.key_size); return -EINVAL; } diff --git a/include/crypto/internal/ecc.h b/include/crypto/internal/ecc.h index 4e2f5f938e91..7ca1f463d1ec 100644 --- a/include/crypto/internal/ecc.h +++ b/include/crypto/internal/ecc.h @@ -103,7 +103,8 @@ int ecc_is_key_valid(unsigned int curve_id, unsigned int ndigits, * Returns 0 if the private key was generated successfully, a negative value * if an error occurred. */ -int ecc_gen_privkey(unsigned int curve_id, unsigned int ndigits, u64 *privkey); +int ecc_gen_privkey(unsigned int curve_id, unsigned int ndigits, + u64 *private_key); /** * ecc_make_pub_key() - Compute an ECC public key