[PATCH 00/14] Add support for NIST P521 to ecdsa and ecdh

[PATCH 00/14] Add support for NIST P521 to ecdsa and ecdh

[Stefan Berger]

This series of patches adds support for NIST P521 curve to ecdsa and
ecdh. Test cases are added to both modules.

An issue with the current code in ecdsa and ecdh is that it assumes that
input arrays providing key coordinates for example are arrays of digits
(a 'digit' is a 'u64'). This works well for existing curves, such as
NIST P192/256/384, but does not work for NIST P521 where coordinates
are 8 digits + 2 bytes long. So some of the changes deal with converting
byte arrays to digits and digits to byte array.

Regards,
   Stefan

Stefan Berger (14):
  crypto: ecdsa - Convert byte arrays with key coordinates to digits
  crypto: ecdsa - Adjust tests on length of key material
  crypto: ecdsa - Adjust res.x mod n for NIST P521
  crypto: ecc - Implement vli_mmod_fast_521 for NIST p521
  crypto: ecc - For NIST P521 use vli_num_bits to get number of bits
  crypto: ecc - Add NIST P521 curve parameters
  crypto: ecdsa - Register NIST P521 and extend test suite
  x509: Add OID for NIST P521 and extend parser for it
  crypto: ecdh - Use properly formatted digits to check for valid key
  crypto: ecc - Implement ecc_digits_to_array to convert digits to byte
    array
  crypto: Add nbits field to ecc_curve structure
  crypto: ecc - Implement and use ecc_curve_get_nbytes to get curve's
    nbytes
  crypto: ecdh - Use functions to copy digits from and to array
  crypto: ecdh - Add support for NIST P521 and add test case

 crypto/asymmetric_keys/x509_cert_parser.c |   3 +
 crypto/ecc.c                              |  71 +++++--
 crypto/ecc_curve_defs.h                   |  45 +++++
 crypto/ecdh.c                             |  59 +++++-
 crypto/ecdsa.c                            |  51 ++++-
 crypto/testmgr.c                          |  14 ++
 crypto/testmgr.h                          | 225 ++++++++++++++++++++++
 include/crypto/ecc_curve.h                |   3 +
 include/crypto/ecdh.h                     |   1 +
 include/crypto/internal/ecc.h             |  61 +++++-
 include/linux/oid_registry.h              |   1 +
 11 files changed, 497 insertions(+), 37 deletions(-)

-- 
2.43.0

[PATCH 01/14] crypto: ecdsa - Convert byte arrays with key coordinates to digits

[Stefan Berger]

For NIST P192/256/384 the public key's x and y parameters could be copied
directly from a given array since both parameters each filled 'ndigits'
of digits (a 'digit' is a u64). For support of NIST P521 the key parameters
first have to be copied right-aligned into a temporary byte array and can
then be copied into the final digit array using ecc_swap_digits.

Implement ecc_digits_from_array to convert a byte array into an array of
digits and use this function in ecdsa_set_pub_key where an input byte array
needs to be converted into digits.

Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
---
 crypto/ecdsa.c                | 15 ++++++++++-----
 include/crypto/internal/ecc.h | 19 +++++++++++++++++++
 2 files changed, 29 insertions(+), 5 deletions(-)

diff --git a/crypto/ecdsa.c b/crypto/ecdsa.c
index fbd76498aba8..c3748ddc9964 100644
--- a/crypto/ecdsa.c
+++ b/crypto/ecdsa.c
@@ -222,9 +222,8 @@ static int ecdsa_ecc_ctx_reset(struct ecc_ctx *ctx)
 static int ecdsa_set_pub_key(struct crypto_akcipher *tfm, const void *key, unsigned int keylen)
 {
 	struct ecc_ctx *ctx = akcipher_tfm_ctx(tfm);
+	unsigned int digitlen, ndigits, nbytes;
 	const unsigned char *d = key;
-	const u64 *digits = (const u64 *)&d[1];
-	unsigned int ndigits;
 	int ret;
 
 	ret = ecdsa_ecc_ctx_reset(ctx);
@@ -238,12 +237,18 @@ static int ecdsa_set_pub_key(struct crypto_akcipher *tfm, const void *key, unsig
 		return -EINVAL;
 
 	keylen--;
-	ndigits = (keylen >> 1) / sizeof(u64);
+	digitlen = keylen >> 1;
+
+	ndigits = digitlen / sizeof(u64);
 	if (ndigits != ctx->curve->g.ndigits)
 		return -EINVAL;
 
-	ecc_swap_digits(digits, ctx->pub_key.x, ndigits);
-	ecc_swap_digits(&digits[ndigits], ctx->pub_key.y, ndigits);
+	nbytes = ndigits * sizeof(u64);
+	d++;
+
+	ecc_digits_from_array(d, digitlen, ctx->pub_key.x, ndigits);
+	ecc_digits_from_array(&d[digitlen], digitlen, ctx->pub_key.y, ndigits);
+
 	ret = ecc_is_pubkey_valid_full(ctx->curve, &ctx->pub_key);
 
 	ctx->pub_key_set = ret == 0;
diff --git a/include/crypto/internal/ecc.h b/include/crypto/internal/ecc.h
index 4f6c1a68882f..ee6886547fd1 100644
--- a/include/crypto/internal/ecc.h
+++ b/include/crypto/internal/ecc.h
@@ -56,6 +56,25 @@ static inline void ecc_swap_digits(const void *in, u64 *out, unsigned int ndigit
 		out[i] = get_unaligned_be64(&src[ndigits - 1 - i]);
 }
 
+/**
+ * ecc_digits_from_array() - Create ndigits from a byte array of nbytes
+ * @in:       Input byte array
+ * @nbytes    Size of input byte array
+ * @out       Output digits array
+ * @ndigits:  Number of digits to create from byte array
+ */
+static inline void ecc_digits_from_array(const u8 *in, unsigned int nbytes,
+					 u64 *out, unsigned int ndigits)
+{
+	unsigned int sz = ndigits * sizeof(u64);
+	u8 tmp[ECC_MAX_DIGITS * sizeof(u64)];
+	unsigned int o = sz - nbytes;
+
+	memset(tmp, 0, o);
+	memcpy(&tmp[o], in, nbytes);
+	ecc_swap_digits(tmp, out, ndigits);
+}
+
 /**
  * ecc_is_key_valid() - Validate a given ECDH private key
  *
-- 
2.43.0

Re: [PATCH 01/14] crypto: ecdsa - Convert byte arrays with key coordinates to digits

[kernel test robot]

Hi Stefan,

kernel test robot noticed the following build warnings:

[auto build test WARNING on herbert-cryptodev-2.6/master]
[also build test WARNING on herbert-crypto-2.6/master linus/master v6.8-rc3 next-20240209]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Stefan-Berger/crypto-ecdsa-Convert-byte-arrays-with-key-coordinates-to-digits/20240209-062415
base:   https://git.kernel.org/pub/scm/linux/kernel/git/herbert/cryptodev-2.6.git master
patch link:    https://lore.kernel.org/r/20240208221840.3665874-2-stefanb%40linux.ibm.com
patch subject: [PATCH 01/14] crypto: ecdsa - Convert byte arrays with key coordinates to digits
config: x86_64-randconfig-101-20240209 (https://download.01.org/0day-ci/archive/20240210/202402100352.1TagPxg9-lkp@intel.com/config)
compiler: clang version 17.0.6 (https://github.com/llvm/llvm-project 6009708b4367171ccdbf4b5905cb6a803753fe18)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240210/202402100352.1TagPxg9-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202402100352.1TagPxg9-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> crypto/ecdsa.c:225:34: warning: variable 'nbytes' set but not used [-Wunused-but-set-variable]
     225 |         unsigned int digitlen, ndigits, nbytes;
         |                                         ^
   1 warning generated.


vim +/nbytes +225 crypto/ecdsa.c

   216	
   217	/*
   218	 * Set the public key given the raw uncompressed key data from an X509
   219	 * certificate. The key data contain the concatenated X and Y coordinates of
   220	 * the public key.
   221	 */
   222	static int ecdsa_set_pub_key(struct crypto_akcipher *tfm, const void *key, unsigned int keylen)
   223	{
   224		struct ecc_ctx *ctx = akcipher_tfm_ctx(tfm);
 > 225		unsigned int digitlen, ndigits, nbytes;
   226		const unsigned char *d = key;
   227		int ret;
   228	
   229		ret = ecdsa_ecc_ctx_reset(ctx);
   230		if (ret < 0)
   231			return ret;
   232	
   233		if (keylen < 1 || (((keylen - 1) >> 1) % sizeof(u64)) != 0)
   234			return -EINVAL;
   235		/* we only accept uncompressed format indicated by '4' */
   236		if (d[0] != 4)
   237			return -EINVAL;
   238	
   239		keylen--;
   240		digitlen = keylen >> 1;
   241	
   242		ndigits = digitlen / sizeof(u64);
   243		if (ndigits != ctx->curve->g.ndigits)
   244			return -EINVAL;
   245	
   246		nbytes = ndigits * sizeof(u64);
   247		d++;
   248	
   249		ecc_digits_from_array(d, digitlen, ctx->pub_key.x, ndigits);
   250		ecc_digits_from_array(&d[digitlen], digitlen, ctx->pub_key.y, ndigits);
   251	
   252		ret = ecc_is_pubkey_valid_full(ctx->curve, &ctx->pub_key);
   253	
   254		ctx->pub_key_set = ret == 0;
   255	
   256		return ret;
   257	}
   258	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki

[PATCH 02/14] crypto: ecdsa - Adjust tests on length of key material

[Stefan Berger]

In preparation for support of NIST P521, adjust the basic tests on the
length of the provided key parameter to only ensure that the length of the
x plus y coordinates parameter array is not an odd number and that each
coordinate fits into an array of 'ndigits' digits. Mathematical tests on
the key's parameters are then done in ecc_is_pubkey_valid_full eliminating
invalid keys.

The change is necessary since NIST P521 keys do not have keys with
coordinates that each fully require 'full' digits (= u64), unlike
NIST P192/256/384 that all require multiple 'full' digits.

Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
---
 crypto/ecdsa.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/crypto/ecdsa.c b/crypto/ecdsa.c
index c3748ddc9964..228f675ac2ed 100644
--- a/crypto/ecdsa.c
+++ b/crypto/ecdsa.c
@@ -230,7 +230,7 @@ static int ecdsa_set_pub_key(struct crypto_akcipher *tfm, const void *key, unsig
 	if (ret < 0)
 		return ret;
 
-	if (keylen < 1 || (((keylen - 1) >> 1) % sizeof(u64)) != 0)
+	if (keylen < 1 || ((keylen - 1) & 1) != 0)
 		return -EINVAL;
 	/* we only accept uncompressed format indicated by '4' */
 	if (d[0] != 4)
@@ -239,7 +239,7 @@ static int ecdsa_set_pub_key(struct crypto_akcipher *tfm, const void *key, unsig
 	keylen--;
 	digitlen = keylen >> 1;
 
-	ndigits = digitlen / sizeof(u64);
+	ndigits = DIV_ROUND_UP(digitlen, sizeof(u64));
 	if (ndigits != ctx->curve->g.ndigits)
 		return -EINVAL;
 
-- 
2.43.0

[PATCH 03/14] crypto: ecdsa - Adjust res.x mod n for NIST P521

[Stefan Berger]

When res.x >= n then res.x mod n can be calculated by iteratively sub-
tracting n from res.x until n > res.x. For NIST P192/256/384 this is done
in a single subtraction since these curves' 'n' use all the 64bit digits.
This is also significantly faster than a modulo operation. For NIST P521
the same could take multiple subtractions. However, during testing with
varying NIST P521 keys it was never necessary to do any subtraction at all.

Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
---
 crypto/ecdsa.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/crypto/ecdsa.c b/crypto/ecdsa.c
index 228f675ac2ed..c9b867a9cbb9 100644
--- a/crypto/ecdsa.c
+++ b/crypto/ecdsa.c
@@ -121,8 +121,8 @@ static int _ecdsa_verify(struct ecc_ctx *ctx, const u64 *hash, const u64 *r, con
 	ecc_point_mult_shamir(&res, u1, &curve->g, u2, &ctx->pub_key, curve);
 
 	/* res.x = res.x mod n (if res.x > order) */
-	if (unlikely(vli_cmp(res.x, curve->n, ndigits) == 1))
-		/* faster alternative for NIST p384, p256 & p192 */
+	while (unlikely(vli_cmp(res.x, curve->n, ndigits) == 1))
+		/* faster alternative for NIST p521, p384, p256 & p192 */
 		vli_sub(res.x, res.x, curve->n, ndigits);
 
 	if (!vli_cmp(res.x, r, ndigits))
-- 
2.43.0

[PATCH 04/14] crypto: ecc - Implement vli_mmod_fast_521 for NIST p521

[Stefan Berger]

Implement vli_mmod_fast_521 following the description for how to calculate
the modulus for NIST P521 in the NIST publication "Recommendations for
Discrete Logarithm-Based Cryptography: Elliptic Curve Domain Parameters"
section G.1.4.

NIST p521 requires 9 64bit digits, so increase the ECC_MAX_DIGITS so that
arrays fit the larger numbers.

Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
---
 crypto/ecc.c                  | 31 +++++++++++++++++++++++++++++++
 include/crypto/internal/ecc.h |  2 +-
 2 files changed, 32 insertions(+), 1 deletion(-)

diff --git a/crypto/ecc.c b/crypto/ecc.c
index f53fb4d6af99..ea7b28b5e00e 100644
--- a/crypto/ecc.c
+++ b/crypto/ecc.c
@@ -902,6 +902,31 @@ static void vli_mmod_fast_384(u64 *result, const u64 *product,
 #undef AND64H
 #undef AND64L
 
+/* Computes result = product % curve_prime
+ * from "Recommendations for Discrete Logarithm-Based Cryptography:
+ *       Elliptic Curve Domain Parameters" G.1.4
+ */
+static void vli_mmod_fast_521(u64 *result, const u64 *product,
+				const u64 *curve_prime, u64 *tmp)
+{
+	const unsigned int ndigits = 9;
+	size_t i;
+
+	for (i = 0; i < ndigits; i++)
+		tmp[i] = product[i];
+	tmp[8] &= 0x1ff;
+
+	vli_set(result, tmp, ndigits);
+
+
+	for (i = 0; i < ndigits; i++)
+		tmp[i] = (product[8 + i] >> 9) | (product[9 + i] << 55);
+	tmp[8] &= 0x1ff;
+
+	vli_mod_add(result, result, tmp, curve_prime, ndigits);
+}
+
+
 /* Computes result = product % curve_prime for different curve_primes.
  *
  * Note that curve_primes are distinguished just by heuristic check and
@@ -941,6 +966,12 @@ static bool vli_mmod_fast(u64 *result, u64 *product,
 	case 6:
 		vli_mmod_fast_384(result, product, curve_prime, tmp);
 		break;
+	case 9:
+		if (!strcmp(curve->name, "nist_521")) {
+			vli_mmod_fast_521(result, product, curve_prime, tmp);
+			break;
+		}
+		fallthrough;
 	default:
 		pr_err_ratelimited("ecc: unsupported digits size!\n");
 		return false;
diff --git a/include/crypto/internal/ecc.h b/include/crypto/internal/ecc.h
index ee6886547fd1..22931f0c7295 100644
--- a/include/crypto/internal/ecc.h
+++ b/include/crypto/internal/ecc.h
@@ -33,7 +33,7 @@
 #define ECC_CURVE_NIST_P192_DIGITS  3
 #define ECC_CURVE_NIST_P256_DIGITS  4
 #define ECC_CURVE_NIST_P384_DIGITS  6
-#define ECC_MAX_DIGITS              (512 / 64) /* due to ecrdsa */
+#define ECC_MAX_DIGITS              (576 / 64) /* due to NIST P521 */
 
 #define ECC_DIGITS_TO_BYTES_SHIFT 3
 
-- 
2.43.0

[PATCH 05/14] crypto: ecc - For NIST P521 use vli_num_bits to get number of bits

[Stefan Berger]

In ecc_point_mult use vli_num_bits to determine the number of bits when
using NIST P521. The change is required specifically for NIST P521 to
pass tests on the public key.

Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
---
 crypto/ecc.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/crypto/ecc.c b/crypto/ecc.c
index ea7b28b5e00e..0734cea284a4 100644
--- a/crypto/ecc.c
+++ b/crypto/ecc.c
@@ -1326,7 +1326,10 @@ 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 (ndigits == 9 && !strcmp(curve->name, "nist_521"))
+		num_bits = vli_num_bits(scalar, ndigits);
+	else
+		num_bits = sizeof(u64) * ndigits * 8 + 1;
 
 	vli_set(rx[1], point->x, ndigits);
 	vli_set(ry[1], point->y, ndigits);
-- 
2.43.0

[PATCH 06/14] crypto: ecc - Add NIST P521 curve parameters

[Stefan Berger]

Add the parameters for the NIST P521 curve and define a new curve ID
for it. Make the curve available in ecc_get_curve.

Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
---
 crypto/ecc.c            |  2 ++
 crypto/ecc_curve_defs.h | 44 +++++++++++++++++++++++++++++++++++++++++
 include/crypto/ecdh.h   |  1 +
 3 files changed, 47 insertions(+)

diff --git a/crypto/ecc.c b/crypto/ecc.c
index 0734cea284a4..73fbbfc8d69c 100644
--- a/crypto/ecc.c
+++ b/crypto/ecc.c
@@ -60,6 +60,8 @@ const struct ecc_curve *ecc_get_curve(unsigned int curve_id)
 		return &nist_p256;
 	case ECC_CURVE_NIST_P384:
 		return &nist_p384;
+	case ECC_CURVE_NIST_P521:
+		return &nist_p521;
 	default:
 		return NULL;
 	}
diff --git a/crypto/ecc_curve_defs.h b/crypto/ecc_curve_defs.h
index 9719934c9428..93a47a5d460a 100644
--- a/crypto/ecc_curve_defs.h
+++ b/crypto/ecc_curve_defs.h
@@ -86,6 +86,50 @@ static struct ecc_curve nist_p384 = {
 	.b = nist_p384_b
 };
 
+/* NIST P-521 */
+static u64 nist_p521_g_x[] = { 0xf97e7e31c2e5bd66ull, 0x3348b3c1856a429bull,
+				0xfe1dc127a2ffa8deull, 0xa14b5e77efe75928ull,
+				0xf828af606b4d3dbaull, 0x9c648139053fb521ull,
+				0x9e3ecb662395b442ull, 0x858e06b70404e9cdull,
+				0xc6ull };
+static u64 nist_p521_g_y[] = { 0x88be94769fd16650ull, 0x353c7086a272c240ull,
+				0xc550b9013fad0761ull, 0x97ee72995ef42640ull,
+				0x17afbd17273e662cull, 0x98f54449579b4468ull,
+				0x5c8a5fb42c7d1bd9ull, 0x39296a789a3bc004ull,
+				0x118ull };
+static u64 nist_p521_p[] = { 0xffffffffffffffffull, 0xffffffffffffffffull,
+				0xffffffffffffffffull, 0xffffffffffffffffull,
+				0xffffffffffffffffull, 0xffffffffffffffffull,
+				0xffffffffffffffffull, 0xffffffffffffffffull,
+				0x1ffull };
+static u64 nist_p521_n[] = { 0xbb6fb71e91386409ull, 0x3bb5c9b8899c47aeull,
+				0x7fcc0148f709a5d0ull, 0x51868783bf2f966bull,
+				0xfffffffffffffffaull, 0xffffffffffffffffull,
+				0xffffffffffffffffull, 0xffffffffffffffffull,
+				0x1ffull };
+static u64 nist_p521_a[] = { 0xfffffffffffffffcull, 0xffffffffffffffffull,
+				0xffffffffffffffffull, 0xffffffffffffffffull,
+				0xffffffffffffffffull, 0xffffffffffffffffull,
+				0xffffffffffffffffull, 0xffffffffffffffffull,
+				0x1ffull };
+static u64 nist_p521_b[] = { 0xef451fd46b503f00ull, 0x3573df883d2c34f1ull,
+				0x1652c0bd3bb1bf07ull, 0x56193951ec7e937bull,
+				0xb8b489918ef109e1ull, 0xa2da725b99b315f3ull,
+				0x929a21a0b68540eeull, 0x953eb9618e1c9a1full,
+				0x051ull };
+static struct ecc_curve nist_p521 = {
+	.name = "nist_521",
+	.g = {
+		.x = nist_p521_g_x,
+		.y = nist_p521_g_y,
+		.ndigits = 9,
+	},
+	.p = nist_p521_p,
+	.n = nist_p521_n,
+	.a = nist_p521_a,
+	.b = nist_p521_b
+};
+
 /* curve25519 */
 static u64 curve25519_g_x[] = { 0x0000000000000009, 0x0000000000000000,
 				0x0000000000000000, 0x0000000000000000 };
diff --git a/include/crypto/ecdh.h b/include/crypto/ecdh.h
index a9f98078d29c..9784ecdd2fb4 100644
--- a/include/crypto/ecdh.h
+++ b/include/crypto/ecdh.h
@@ -26,6 +26,7 @@
 #define ECC_CURVE_NIST_P192	0x0001
 #define ECC_CURVE_NIST_P256	0x0002
 #define ECC_CURVE_NIST_P384	0x0003
+#define ECC_CURVE_NIST_P521	0x0004
 
 /**
  * struct ecdh - define an ECDH private key
-- 
2.43.0

[PATCH 07/14] crypto: ecdsa - Register NIST P521 and extend test suite

[Stefan Berger]

Register NIST P521 as an akcipher and extend the testmgr with
NIST P521-specific test vectors.

Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
---
 crypto/ecdsa.c   |  30 ++++++++++
 crypto/testmgr.c |   7 +++
 crypto/testmgr.h | 146 +++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 183 insertions(+)

diff --git a/crypto/ecdsa.c b/crypto/ecdsa.c
index c9b867a9cbb9..9b74cf69989a 100644
--- a/crypto/ecdsa.c
+++ b/crypto/ecdsa.c
@@ -270,6 +270,28 @@ static unsigned int ecdsa_max_size(struct crypto_akcipher *tfm)
 	return ctx->pub_key.ndigits << ECC_DIGITS_TO_BYTES_SHIFT;
 }
 
+static int ecdsa_nist_p521_init_tfm(struct crypto_akcipher *tfm)
+{
+	struct ecc_ctx *ctx = akcipher_tfm_ctx(tfm);
+
+	return ecdsa_ecc_ctx_init(ctx, ECC_CURVE_NIST_P521);
+}
+
+static struct akcipher_alg ecdsa_nist_p521 = {
+	.verify = ecdsa_verify,
+	.set_pub_key = ecdsa_set_pub_key,
+	.max_size = ecdsa_max_size,
+	.init = ecdsa_nist_p521_init_tfm,
+	.exit = ecdsa_exit_tfm,
+	.base = {
+		.cra_name = "ecdsa-nist-p521",
+		.cra_driver_name = "ecdsa-nist-p521-generic",
+		.cra_priority = 100,
+		.cra_module = THIS_MODULE,
+		.cra_ctxsize = sizeof(struct ecc_ctx),
+	},
+};
+
 static int ecdsa_nist_p384_init_tfm(struct crypto_akcipher *tfm)
 {
 	struct ecc_ctx *ctx = akcipher_tfm_ctx(tfm);
@@ -353,8 +375,15 @@ static int __init ecdsa_init(void)
 	if (ret)
 		goto nist_p384_error;
 
+	ret = crypto_register_akcipher(&ecdsa_nist_p521);
+	if (ret)
+		goto nist_p521_error;
+
 	return 0;
 
+nist_p521_error:
+	crypto_unregister_akcipher(&ecdsa_nist_p384);
+
 nist_p384_error:
 	crypto_unregister_akcipher(&ecdsa_nist_p256);
 
@@ -370,6 +399,7 @@ static void __exit ecdsa_exit(void)
 		crypto_unregister_akcipher(&ecdsa_nist_p192);
 	crypto_unregister_akcipher(&ecdsa_nist_p256);
 	crypto_unregister_akcipher(&ecdsa_nist_p384);
+	crypto_unregister_akcipher(&ecdsa_nist_p521);
 }
 
 subsys_initcall(ecdsa_init);
diff --git a/crypto/testmgr.c b/crypto/testmgr.c
index c26aeda85787..a017b4ad119b 100644
--- a/crypto/testmgr.c
+++ b/crypto/testmgr.c
@@ -5097,6 +5097,13 @@ static const struct alg_test_desc alg_test_descs[] = {
 		.suite = {
 			.akcipher = __VECS(ecdsa_nist_p384_tv_template)
 		}
+	}, {
+		.alg = "ecdsa-nist-p521",
+		.test = alg_test_akcipher,
+		.fips_allowed = 1,
+		.suite = {
+			.akcipher = __VECS(ecdsa_nist_p521_tv_template)
+		}
 	}, {
 		.alg = "ecrdsa",
 		.test = alg_test_akcipher,
diff --git a/crypto/testmgr.h b/crypto/testmgr.h
index 986f331a5fc2..9bde04be8df9 100644
--- a/crypto/testmgr.h
+++ b/crypto/testmgr.h
@@ -991,6 +991,152 @@ static const struct akcipher_testvec ecdsa_nist_p384_tv_template[] = {
 	},
 };
 
+static const struct akcipher_testvec ecdsa_nist_p521_tv_template[] = {
+	{
+	.key = /* secp521r1(sha224) */
+	"\x04\x01\x4f\x43\x18\xb6\xa9\xc9\x5d\x68\xd3\xa9\x42\xf8\x98\xc0"
+	"\xd2\xd1\xa9\x50\x3b\xe8\xc4\x40\xe6\x11\x78\x88\x4b\xbd\x76\xa7"
+	"\x9a\xe0\xdd\x31\xa4\x67\x78\x45\x33\x9e\x8c\xd1\xc7\x44\xac\x61"
+	"\x68\xc8\x04\xe7\x5c\x79\xb1\xf1\x41\x0c\x71\xc0\x53\xa8\xbc\xfb"
+	"\xf5\xca\xd4\x01\x40\xfd\xa3\x45\xda\x08\xe0\xb4\xcb\x28\x3b\x0a"
+	"\x02\x35\x5f\x02\x9f\x3f\xcd\xef\x08\x22\x40\x97\x74\x65\xb7\x76"
+	"\x85\xc7\xc0\x5c\xfb\x81\xe1\xa5\xde\x0c\x4e\x8b\x12\x31\xb6\x47"
+	"\xed\x37\x0f\x99\x3f\x26\xba\xa3\x8e\xff\x79\x34\x7c\x3a\xfe\x1f"
+	"\x3b\x83\x82\x2f\x14",
+	.key_len = 133,
+	.params =
+	"\x30\x10\x06\x07\x2a\x86\x48\xce\x3d\x02\x01\x06\x05\x2b\x81\x04"
+	"\x00\x23",
+	.param_len = 18,
+	.m =
+	"\xa2\x3a\x6a\x8c\x7b\x3c\xf2\x51\xf8\xbe\x5f\x4f\x3b\x15\x05\xc4"
+	"\xb5\xbc\x19\xe7\x21\x85\xe9\x23\x06\x33\x62\xfb",
+	.m_size = 28,
+	.algo = OID_id_ecdsa_with_sha224,
+	.c =
+	"\x30\x81\x86\x02\x41\x01\xd6\x43\xe7\xff\x42\xb2\xba\x74\x35\xf6"
+	"\xdc\x6d\x02\x7b\x22\xac\xe2\xef\x07\x92\xee\x60\x94\x06\xf8\x3f"
+	"\x59\x0f\x74\xf0\x3f\xd8\x18\xc6\x37\x8a\xcb\xa7\xd8\x7d\x98\x85"
+	"\x29\x88\xff\x0b\x94\x94\x6c\xa6\x9b\x89\x8b\x1e\xfd\x09\x46\x6b"
+	"\xc7\xaf\x7a\xb9\x19\x0a\x02\x41\x3a\x26\x0d\x55\xcd\x23\x1e\x7d"
+	"\xa0\x5e\xf9\x88\xf3\xd2\x32\x90\x57\x0f\xf8\x65\x97\x6b\x09\x4d"
+	"\x22\x26\x0b\x5f\x49\x32\x6b\x91\x99\x30\x90\x0f\x1c\x8f\x78\xd3"
+	"\x9f\x0e\x64\xcc\xc4\xe8\x43\xd9\x0e\x1c\xad\x22\xda\x82\x00\x35"
+	"\xa3\x50\xb1\xa5\x98\x92\x2a\xa5\x52",
+	.c_size = 137,
+	.public_key_vec = true,
+	.siggen_sigver_test = true,
+	},
+	{
+	.key = /* secp521r1(sha256) */
+	"\x04\x01\x05\x3a\x6b\x3b\x5a\x0f\xa7\xb9\xb7\x32\x53\x4e\xe2\xae"
+	"\x0a\x52\xc5\xda\xdd\x5a\x79\x1c\x30\x2d\x33\x07\x79\xd5\x70\x14"
+	"\x61\x0c\xec\x26\x4d\xd8\x35\x57\x04\x1d\x88\x33\x4d\xce\x05\x36"
+	"\xa5\xaf\x56\x84\xfa\x0b\x9e\xff\x7b\x30\x4b\x92\x1d\x06\xf8\x81"
+	"\x24\x1e\x51\x00\x09\x21\x51\xf7\x46\x0a\x77\xdb\xb5\x0c\xe7\x9c"
+	"\xff\x27\x3c\x02\x71\xd7\x85\x36\xf1\xaa\x11\x59\xd8\xb8\xdc\x09"
+	"\xdc\x6d\x5a\x6f\x63\x07\x6c\xe1\xe5\x4d\x6e\x0f\x6e\xfb\x7c\x05"
+	"\x8a\xe9\x53\xa8\xcf\xce\x43\x0e\x82\x20\x86\xbc\x88\x9c\xb7\xe3"
+	"\xe6\x77\x1e\x1f\x8a",
+	.key_len = 133,
+	.params =
+	"\x30\x10\x06\x07\x2a\x86\x48\xce\x3d\x02\x01\x06\x05\x2b\x81\x04"
+	"\x00\x23",
+	.param_len = 18,
+	.m =
+	"\xcc\x97\x73\x0c\x73\xa2\x53\x2b\xfa\xd7\x83\x1d\x0c\x72\x1b\x39"
+	"\x80\x71\x8d\xdd\xc5\x9b\xff\x55\x32\x98\x25\xa2\x58\x2e\xb7\x73",
+	.m_size = 32,
+	.algo = OID_id_ecdsa_with_sha256,
+	.c =
+	"\x30\x81\x88\x02\x42\x00\xcd\xa5\x5f\x57\x52\x27\x78\x3a\xb5\x06"
+	"\x0f\xfd\x83\xfc\x0e\xd9\xce\x50\x9f\x7d\x1f\xca\x8b\xa8\x2d\x56"
+	"\x3c\xf6\xf0\xd8\xe1\xb7\x5d\x95\x35\x6f\x02\x0e\xaf\xe1\x4c\xae"
+	"\xce\x54\x76\x9a\xc2\x8f\xb8\x38\x1f\x46\x0b\x04\x64\x34\x79\xde"
+	"\x7e\xd7\x59\x10\xe9\xd9\xd5\x02\x42\x01\xcf\x50\x85\x38\xf9\x15"
+	"\x83\x18\x04\x6b\x35\xae\x65\xb5\x99\x12\x0a\xa9\x79\x24\xb9\x37"
+	"\x35\xdd\xa0\xe0\x87\x2c\x44\x4b\x5a\xee\xaf\xfa\x10\xdd\x9b\xfb"
+	"\x36\x1a\x31\x03\x42\x02\x5f\x50\xf0\xa2\x0d\x1c\x57\x56\x8f\x12"
+	"\xb7\x1d\x91\x55\x38\xb6\xf6\x34\x65\xc7\xbd",
+	.c_size = 139,
+	.public_key_vec = true,
+	.siggen_sigver_test = true,
+	},
+	{
+	.key = /* secp521r1(sha384) */
+	"\x04\x00\x2e\xd6\x21\x04\x75\xc3\xdc\x7d\xff\x0e\xf3\x70\x25\x2b"
+	"\xad\x72\xfc\x5a\x91\xf1\xd5\x9c\x64\xf3\x1f\x47\x11\x10\x62\x33"
+	"\xfd\x2e\xe8\x32\xca\x9e\x6f\x0a\x4c\x5b\x35\x9a\x46\xc5\xe7\xd4"
+	"\x38\xda\xb2\xf0\xf4\x87\xf3\x86\xf4\xea\x70\xad\x1e\xd4\x78\x8c"
+	"\x36\x18\x17\x00\xa2\xa0\x34\x1b\x2e\x6a\xdf\x06\xd6\x99\x2d\x47"
+	"\x50\x92\x1a\x8a\x72\x9c\x23\x44\xfa\xa7\xa9\xed\xa6\xef\x26\x14"
+	"\xb3\x9d\xfe\x5e\xa3\x8c\xd8\x29\xf8\xdf\xad\xa6\xab\xfc\xdd\x46"
+	"\x22\x6e\xd7\x35\xc7\x23\xb7\x13\xae\xb6\x34\xff\xd7\x80\xe5\x39"
+	"\xb3\x3b\x5b\x1b\x94",
+	.key_len = 133,
+	.params =
+	"\x30\x10\x06\x07\x2a\x86\x48\xce\x3d\x02\x01\x06\x05\x2b\x81\x04"
+	"\x00\x23",
+	.param_len = 18,
+	.m =
+	"\x36\x98\xd6\x82\xfa\xad\xed\x3c\xb9\x40\xb6\x4d\x9e\xb7\x04\x26"
+	"\xad\x72\x34\x44\xd2\x81\xb4\x9b\xbe\x01\x04\x7a\xd8\x50\xf8\x59"
+	"\xba\xad\x23\x85\x6b\x59\xbe\xfb\xf6\x86\xd4\x67\xa8\x43\x28\x76",
+	.m_size = 48,
+	.algo = OID_id_ecdsa_with_sha384,
+	.c =
+	"\x30\x81\x88\x02\x42\x00\x93\x96\x76\x3c\x27\xea\xaa\x9c\x26\xec"
+	"\x51\xdc\xe8\x35\x5e\xae\x16\xf2\x4b\x64\x98\xf7\xec\xda\xc7\x7e"
+	"\x42\x71\x86\x57\x2d\xf1\x7d\xe4\xdf\x9b\x7d\x9e\x47\xca\x33\x32"
+	"\x76\x06\xd0\xf9\xc0\xe4\xe6\x84\x59\xfd\x1a\xc4\x40\xdd\x43\xb8"
+	"\x6a\xdd\xfb\xe6\x63\x4e\x28\x02\x42\x00\xff\xc3\x6a\x87\x6e\xb5"
+	"\x13\x1f\x20\x55\xce\x37\x97\xc9\x05\x51\xe5\xe4\x3c\xbc\x93\x65"
+	"\x57\x1c\x30\xda\xa7\xcd\x26\x28\x76\x3b\x52\xdf\xc4\xc0\xdb\x54"
+	"\xdb\x8a\x0d\x6a\xc3\xf3\x7a\xd1\xfa\xe7\xa7\xe5\x5a\x94\x56\xcf"
+	"\x8f\xb4\x22\xc6\x4f\xab\x2b\x62\xc1\x42\xb1",
+	.c_size = 139,
+	.public_key_vec = true,
+	.siggen_sigver_test = true,
+	},
+	{
+	.key = /* secp521r1(sha512) */
+	"\x04\x00\xc7\x65\xee\x0b\x86\x7d\x8f\x02\xf1\x74\x5b\xb0\x4c\x3f"
+	"\xa6\x35\x60\x9f\x55\x23\x11\xcc\xdf\xb8\x42\x99\xee\x6c\x96\x6a"
+	"\x27\xa2\x56\xb2\x2b\x03\xad\x0f\xe7\x97\xde\x09\x5d\xb4\xc5\x5f"
+	"\xbd\x87\x37\xbf\x5a\x16\x35\x56\x08\xfd\x6f\x06\x1a\x1c\x84\xee"
+	"\xc3\x64\xb3\x00\x9e\xbd\x6e\x60\x76\xee\x69\xfd\x3a\xb8\xcd\x7e"
+	"\x91\x68\x53\x57\x44\x13\x2e\x77\x09\x2a\xbe\x48\xbd\x91\xd8\xf6"
+	"\x21\x16\x53\x99\xd5\xf0\x40\xad\xa6\xf8\x58\x26\xb6\x9a\xf8\x77"
+	"\xfe\x3a\x05\x1a\xdb\xa9\x0f\xc0\x6c\x76\x30\x8c\xd8\xde\x44\xae"
+	"\xd0\x17\xdf\x49\x6a",
+	.key_len = 133,
+	.params =
+	"\x30\x10\x06\x07\x2a\x86\x48\xce\x3d\x02\x01\x06\x05\x2b\x81\x04"
+	"\x00\x23",
+	.param_len = 18,
+	.m =
+	"\x5c\xa6\xbc\x79\xb8\xa0\x1e\x11\x83\xf7\xe9\x05\xdf\xba\xf7\x69"
+	"\x97\x22\x32\xe4\x94\x7c\x65\xbd\x74\xc6\x9a\x8b\xbd\x0d\xdc\xed"
+	"\xf5\x9c\xeb\xe1\xc5\x68\x40\xf2\xc7\x04\xde\x9e\x0d\x76\xc5\xa3"
+	"\xf9\x3c\x6c\x98\x08\x31\xbd\x39\xe8\x42\x7f\x80\x39\x6f\xfe\x68",
+	.m_size = 64,
+	.algo = OID_id_ecdsa_with_sha512,
+	.c =
+	"\x30\x81\x88\x02\x42\x01\x5c\x71\x86\x96\xac\x21\x33\x7e\x4e\xaa"
+	"\x86\xec\xa8\x05\x03\x52\x56\x63\x0e\x02\xcc\x94\xa9\x05\xb9\xfb"
+	"\x62\x1e\x42\x03\x6c\x74\x8a\x1f\x12\x3e\xb7\x7e\x51\xff\x7f\x27"
+	"\x93\xe8\x6c\x49\x7d\x28\xfc\x80\xa6\x13\xfc\xb6\x90\xf7\xbb\x28"
+	"\xb5\x04\xb0\xb6\x33\x1c\x7e\x02\x42\x01\x70\x43\x52\x1d\xe3\xc6"
+	"\xbd\x5a\x40\x95\x35\x89\x4f\x41\x5f\x9e\x19\x88\x05\x3e\x43\x39"
+	"\x01\xbd\xb7\x7a\x76\x37\x51\x47\x49\x98\x12\x71\xd0\xe9\xca\xa7"
+	"\xc0\xcb\xaa\x00\x55\xbb\x6a\xb4\x73\x00\xd2\x72\x74\x13\x63\x39"
+	"\xa6\xe5\x25\x46\x1e\x77\x44\x78\xe0\xd1\x04",
+	.c_size = 139,
+	.public_key_vec = true,
+	.siggen_sigver_test = true,
+	},
+};
+
 /*
  * EC-RDSA test vectors are generated by gost-engine.
  */
-- 
2.43.0

[PATCH 08/14] x509: Add OID for NIST P521 and extend parser for it

[Stefan Berger]

Prepare the x509 parser to accept NIST P521 certificates and add the
OID for ansip521r1, which is the identifier for NIST P521.

Cc: David Howells <dhowells@redhat.com>
Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
---
 crypto/asymmetric_keys/x509_cert_parser.c | 3 +++
 include/linux/oid_registry.h              | 1 +
 2 files changed, 4 insertions(+)

diff --git a/crypto/asymmetric_keys/x509_cert_parser.c b/crypto/asymmetric_keys/x509_cert_parser.c
index 487204d39426..99f809b7910b 100644
--- a/crypto/asymmetric_keys/x509_cert_parser.c
+++ b/crypto/asymmetric_keys/x509_cert_parser.c
@@ -538,6 +538,9 @@ int x509_extract_key_data(void *context, size_t hdrlen,
 		case OID_id_ansip384r1:
 			ctx->cert->pub->pkey_algo = "ecdsa-nist-p384";
 			break;
+		case OID_id_ansip521r1:
+			ctx->cert->pub->pkey_algo = "ecdsa-nist-p521";
+			break;
 		default:
 			return -ENOPKG;
 		}
diff --git a/include/linux/oid_registry.h b/include/linux/oid_registry.h
index 3921fbed0b28..af16d96fbbf2 100644
--- a/include/linux/oid_registry.h
+++ b/include/linux/oid_registry.h
@@ -65,6 +65,7 @@ enum OID {
 	OID_Scram,			/* 1.3.6.1.5.5.14 */
 	OID_certAuthInfoAccess,		/* 1.3.6.1.5.5.7.1.1 */
 	OID_id_ansip384r1,		/* 1.3.132.0.34 */
+	OID_id_ansip521r1,		/* 1.3.132.0.35 */
 	OID_sha256,			/* 2.16.840.1.101.3.4.2.1 */
 	OID_sha384,			/* 2.16.840.1.101.3.4.2.2 */
 	OID_sha512,			/* 2.16.840.1.101.3.4.2.3 */
-- 
2.43.0

[PATCH 09/14] crypto: ecdh - Use properly formatted digits to check for valid key

[Stefan Berger]

ecc_is_key_valid expects a key with the most significant digit in the last
entry of the digit array. Currently a reverse key is passed to
ecc_is_key_valid that then passes that rather simple test checking whether
the private key is in range [2, n-3]. For all current ecdh-supported
curves (NIST P192/256/384) n is a rather large number, therefore easily
passing this test. However, this will not work for NIST P521 anymore but
the properly prepared array of digits will need to be passed. Therefore,
use ecc_digits_from_array to create the digits array from the byte array
and pass the result to this test function. Use a swapped key in
ctx->private_key.

Note: The ctx->private_key is currently (unnecessarily) swapped and will
be swapped into proper order in ecc_make_pub_key and
crypto_ecdh_shared_secret before usage. Also the key generated in
ecc_gen_privkey, that is assigned to ctx->private_key, is currently
swapped. The above mention 'swap' and the ones mention here could likely
all be removed.

Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
---
 crypto/ecdh.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/crypto/ecdh.c b/crypto/ecdh.c
index 80afee3234fb..83029233c03e 100644
--- a/crypto/ecdh.c
+++ b/crypto/ecdh.c
@@ -27,6 +27,8 @@ 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];
+	unsigned int nbytes;
 	struct ecdh params;
 
 	if (crypto_ecdh_decode_key(buf, len, &params) < 0 ||
@@ -37,10 +39,13 @@ 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);
+	nbytes = ctx->ndigits << ECC_DIGITS_TO_BYTES_SHIFT;
+
+	ecc_digits_from_array(params.key, nbytes, priv, ctx->ndigits);
+	ecc_swap_digits(priv, ctx->private_key, 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;
 	}
-- 
2.43.0

[PATCH 10/14] crypto: ecc - Implement ecc_digits_to_array to convert digits to byte array

[Stefan Berger]

Implement ecc_digits_to_array to convert an array of ndigits into an
nbytes-sized byte array.

Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
---
 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
  *
-- 
2.43.0

[PATCH 11/14] crypto: Add nbits field to ecc_curve structure

[Stefan Berger]

Add the number of bits a curve has to the ecc_curve definition. This field
only needs to be set for curves that don't fill up all bytes in their
digits, such as NIST P521 which has only 9 bits in the most significant
digit. This field will be used to determine the number of bytes a curve
requires for its key coordinates for example.

Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
---
 crypto/ecc_curve_defs.h    | 1 +
 include/crypto/ecc_curve.h | 3 +++
 2 files changed, 4 insertions(+)

diff --git a/crypto/ecc_curve_defs.h b/crypto/ecc_curve_defs.h
index 93a47a5d460a..09a221657c31 100644
--- a/crypto/ecc_curve_defs.h
+++ b/crypto/ecc_curve_defs.h
@@ -119,6 +119,7 @@ static u64 nist_p521_b[] = { 0xef451fd46b503f00ull, 0x3573df883d2c34f1ull,
 				0x051ull };
 static struct ecc_curve nist_p521 = {
 	.name = "nist_521",
+	.nbits = 521,
 	.g = {
 		.x = nist_p521_g_x,
 		.y = nist_p521_g_y,
diff --git a/include/crypto/ecc_curve.h b/include/crypto/ecc_curve.h
index 70964781eb68..337a44956926 100644
--- a/include/crypto/ecc_curve.h
+++ b/include/crypto/ecc_curve.h
@@ -23,6 +23,8 @@ struct ecc_point {
  * struct ecc_curve - definition of elliptic curve
  *
  * @name:	Short name of the curve.
+ * @nbits:      Curves that do not use all bits in their ndigits must specify
+ *              their number of bits here, otherwise can leave at 0.
  * @g:		Generator point of the curve.
  * @p:		Prime number, if Barrett's reduction is used for this curve
  *		pre-calculated value 'mu' is appended to the @p after ndigits.
@@ -34,6 +36,7 @@ struct ecc_point {
  */
 struct ecc_curve {
 	char *name;
+	unsigned int nbits;
 	struct ecc_point g;
 	u64 *p;
 	u64 *n;
-- 
2.43.0

[PATCH 12/14] crypto: ecc - Implement and use ecc_curve_get_nbytes to get curve's nbytes

[Stefan Berger]

Implement ecc_curve_get_nbytes to get a curve's number of bytes (nbytes).
The number of bytes can be derived from the nbits field of a curve, if
set, otherwise from the ndigits field.

Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
---
 crypto/ecc.c                  |  6 ++----
 include/crypto/internal/ecc.h | 11 +++++++++++
 2 files changed, 13 insertions(+), 4 deletions(-)

diff --git a/crypto/ecc.c b/crypto/ecc.c
index 73fbbfc8d69c..f643719450b8 100644
--- a/crypto/ecc.c
+++ b/crypto/ecc.c
@@ -1478,10 +1478,8 @@ static int __ecc_is_key_valid(const struct ecc_curve *curve,
 int ecc_is_key_valid(unsigned int curve_id, unsigned int ndigits,
 		     const u64 *private_key, unsigned int private_key_len)
 {
-	int nbytes;
 	const struct ecc_curve *curve = ecc_get_curve(curve_id);
-
-	nbytes = ndigits << ECC_DIGITS_TO_BYTES_SHIFT;
+	int nbytes = ecc_curve_get_nbytes(curve);
 
 	if (private_key_len != nbytes)
 		return -EINVAL;
@@ -1506,7 +1504,7 @@ int ecc_gen_privkey(unsigned int curve_id, unsigned int ndigits, u64 *privkey)
 {
 	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 nbytes = ecc_curve_get_nbytes(curve);
 	unsigned int nbits = vli_num_bits(curve->n, ndigits);
 	int err;
 
diff --git a/include/crypto/internal/ecc.h b/include/crypto/internal/ecc.h
index 75ee113f58f9..ba9ca0dcb971 100644
--- a/include/crypto/internal/ecc.h
+++ b/include/crypto/internal/ecc.h
@@ -93,6 +93,17 @@ static inline void ecc_digits_to_array(const u64 *in, unsigned int ndigits,
 	memcpy(out, &tmp[o], nbytes);
 }
 
+/**
+ * ecc_curve_get_nbytes() - Get the number of bytes the curve requires
+ * @curve:   The curve
+ */
+static inline unsigned int ecc_curve_get_nbytes(const struct ecc_curve *curve)
+{
+	if (curve->nbits)
+		return DIV_ROUND_UP(curve->nbits, 8);
+	return curve->g.ndigits << ECC_DIGITS_TO_BYTES_SHIFT;
+}
+
 /**
  * ecc_is_key_valid() - Validate a given ECDH private key
  *
-- 
2.43.0

[PATCH 13/14] crypto: ecdh - Use functions to copy digits from and to array

[Stefan Berger]

All curves supported so far provide digit arrays with ndigits to convert
coordinates from and to. For NIST P521 only 8 digits and 2 bytes will be
given per coordinate so that conversion from ndigits (= 9) does not work
since some bytes are missing. Therefore, regard the input (and output)
arrays as byte arrays that need to be converted to digits (from digits).
Use ecc_digits_from array to convert a byte array to digits and
ecc_digits_to_array to convert digits to a byte array.

crypt_ecdh_shared_secret creates nbytes into a byte array from which
to create rand_z from. The most significant digit of rand_z needs to be
adjusted to mask out unnecessary bits beyond the 521 bits of the NIST P521
curve. Therefore, apply a mask to the most significant digit.

Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
---
 crypto/ecc.c                  | 27 +++++++++++++++------------
 crypto/ecdh.c                 | 24 ++++++++++++++----------
 include/crypto/internal/ecc.h | 10 +++++++---
 3 files changed, 36 insertions(+), 25 deletions(-)

diff --git a/crypto/ecc.c b/crypto/ecc.c
index f643719450b8..e80ab4f3b5e1 100644
--- a/crypto/ecc.c
+++ b/crypto/ecc.c
@@ -1542,7 +1542,8 @@ int ecc_gen_privkey(unsigned int curve_id, unsigned int ndigits, u64 *privkey)
 EXPORT_SYMBOL(ecc_gen_privkey);
 
 int ecc_make_pub_key(unsigned int curve_id, unsigned int ndigits,
-		     const u64 *private_key, u64 *public_key)
+		     const u64 *private_key, u8 *public_key,
+		     unsigned int nbytes)
 {
 	int ret = 0;
 	struct ecc_point *pk;
@@ -1570,8 +1571,8 @@ int ecc_make_pub_key(unsigned int curve_id, unsigned int ndigits,
 		goto err_free_point;
 	}
 
-	ecc_swap_digits(pk->x, public_key, ndigits);
-	ecc_swap_digits(pk->y, &public_key[ndigits], ndigits);
+	ecc_digits_to_array(pk->x, ndigits, public_key, nbytes);
+	ecc_digits_to_array(pk->y, ndigits, &public_key[nbytes], nbytes);
 
 err_free_point:
 	ecc_free_point(pk);
@@ -1641,14 +1642,14 @@ int ecc_is_pubkey_valid_full(const struct ecc_curve *curve,
 EXPORT_SYMBOL(ecc_is_pubkey_valid_full);
 
 int crypto_ecdh_shared_secret(unsigned int curve_id, unsigned int ndigits,
-			      const u64 *private_key, const u64 *public_key,
-			      u64 *secret)
+			      const u64 *private_key, const u8 *public_key,
+			      unsigned int nbytes, u8 *secret, u64 msd_mask)
 {
 	int ret = 0;
 	struct ecc_point *product, *pk;
 	u64 priv[ECC_MAX_DIGITS];
 	u64 rand_z[ECC_MAX_DIGITS];
-	unsigned int nbytes;
+	u8 tmp[ECC_MAX_DIGITS << ECC_DIGITS_TO_BYTES_SHIFT];
 	const struct ecc_curve *curve = ecc_get_curve(curve_id);
 
 	if (!private_key || !public_key || !curve ||
@@ -1657,9 +1658,10 @@ int crypto_ecdh_shared_secret(unsigned int curve_id, unsigned int ndigits,
 		goto out;
 	}
 
-	nbytes = ndigits << ECC_DIGITS_TO_BYTES_SHIFT;
-
-	get_random_bytes(rand_z, nbytes);
+	get_random_bytes(tmp, nbytes);
+	ecc_digits_from_array(tmp, nbytes, rand_z, ndigits);
+	if (msd_mask)
+		rand_z[ndigits - 1] &= msd_mask;
 
 	pk = ecc_alloc_point(ndigits);
 	if (!pk) {
@@ -1667,8 +1669,9 @@ int crypto_ecdh_shared_secret(unsigned int curve_id, unsigned int ndigits,
 		goto out;
 	}
 
-	ecc_swap_digits(public_key, pk->x, ndigits);
-	ecc_swap_digits(&public_key[ndigits], pk->y, ndigits);
+	ecc_digits_from_array(public_key, nbytes, pk->x, ndigits);
+	ecc_digits_from_array(&public_key[nbytes], nbytes, pk->y, ndigits);
+
 	ret = ecc_is_pubkey_valid_partial(curve, pk);
 	if (ret)
 		goto err_alloc_product;
@@ -1688,7 +1691,7 @@ int crypto_ecdh_shared_secret(unsigned int curve_id, unsigned int ndigits,
 		goto err_validity;
 	}
 
-	ecc_swap_digits(product->x, secret, ndigits);
+	ecc_digits_to_array(product->x, ndigits, secret, nbytes);
 
 err_validity:
 	memzero_explicit(priv, sizeof(priv));
diff --git a/crypto/ecdh.c b/crypto/ecdh.c
index 83029233c03e..9f16dbef94d5 100644
--- a/crypto/ecdh.c
+++ b/crypto/ecdh.c
@@ -15,6 +15,8 @@
 struct ecdh_ctx {
 	unsigned int curve_id;
 	unsigned int ndigits;
+	unsigned int nbytes;
+	u64 msd_mask;
 	u64 private_key[ECC_MAX_DIGITS];
 };
 
@@ -28,7 +30,6 @@ static int ecdh_set_secret(struct crypto_kpp *tfm, const void *buf,
 {
 	struct ecdh_ctx *ctx = ecdh_get_ctx(tfm);
 	u64 priv[ECC_MAX_DIGITS];
-	unsigned int nbytes;
 	struct ecdh params;
 
 	if (crypto_ecdh_decode_key(buf, len, &params) < 0 ||
@@ -39,9 +40,7 @@ static int ecdh_set_secret(struct crypto_kpp *tfm, const void *buf,
 		return ecc_gen_privkey(ctx->curve_id, ctx->ndigits,
 				       ctx->private_key);
 
-	nbytes = ctx->ndigits << ECC_DIGITS_TO_BYTES_SHIFT;
-
-	ecc_digits_from_array(params.key, nbytes, priv, ctx->ndigits);
+	ecc_digits_from_array(params.key, ctx->nbytes, priv, ctx->ndigits);
 	ecc_swap_digits(priv, ctx->private_key, ctx->ndigits);
 
 	if (ecc_is_key_valid(ctx->curve_id, ctx->ndigits,
@@ -56,13 +55,13 @@ static int ecdh_compute_value(struct kpp_request *req)
 {
 	struct crypto_kpp *tfm = crypto_kpp_reqtfm(req);
 	struct ecdh_ctx *ctx = ecdh_get_ctx(tfm);
-	u64 *public_key;
-	u64 *shared_secret = NULL;
+	unsigned int nbytes = ctx->nbytes;
+	u8 *public_key;
+	u8 *shared_secret = NULL;
 	void *buf;
-	size_t copied, nbytes, public_key_sz;
+	size_t copied, public_key_sz;
 	int ret = -ENOMEM;
 
-	nbytes = ctx->ndigits << ECC_DIGITS_TO_BYTES_SHIFT;
 	/* Public part is a point thus it has both coordinates */
 	public_key_sz = 2 * nbytes;
 
@@ -91,12 +90,14 @@ static int ecdh_compute_value(struct kpp_request *req)
 
 		ret = crypto_ecdh_shared_secret(ctx->curve_id, ctx->ndigits,
 						ctx->private_key, public_key,
-						shared_secret);
+						nbytes, shared_secret,
+						ctx->msd_mask);
 
 		buf = shared_secret;
 	} else {
 		ret = ecc_make_pub_key(ctx->curve_id, ctx->ndigits,
-				       ctx->private_key, public_key);
+				       ctx->private_key, public_key,
+				       nbytes);
 		buf = public_key;
 		nbytes = public_key_sz;
 	}
@@ -134,6 +135,7 @@ static int ecdh_nist_p192_init_tfm(struct crypto_kpp *tfm)
 
 	ctx->curve_id = ECC_CURVE_NIST_P192;
 	ctx->ndigits = ECC_CURVE_NIST_P192_DIGITS;
+	ctx->nbytes = ctx->ndigits << ECC_DIGITS_TO_BYTES_SHIFT;
 
 	return 0;
 }
@@ -159,6 +161,7 @@ static int ecdh_nist_p256_init_tfm(struct crypto_kpp *tfm)
 
 	ctx->curve_id = ECC_CURVE_NIST_P256;
 	ctx->ndigits = ECC_CURVE_NIST_P256_DIGITS;
+	ctx->nbytes = ctx->ndigits << ECC_DIGITS_TO_BYTES_SHIFT;
 
 	return 0;
 }
@@ -184,6 +187,7 @@ static int ecdh_nist_p384_init_tfm(struct crypto_kpp *tfm)
 
 	ctx->curve_id = ECC_CURVE_NIST_P384;
 	ctx->ndigits = ECC_CURVE_NIST_P384_DIGITS;
+	ctx->nbytes = ctx->ndigits << ECC_DIGITS_TO_BYTES_SHIFT;
 
 	return 0;
 }
diff --git a/include/crypto/internal/ecc.h b/include/crypto/internal/ecc.h
index ba9ca0dcb971..29e899fcde8d 100644
--- a/include/crypto/internal/ecc.h
+++ b/include/crypto/internal/ecc.h
@@ -138,12 +138,14 @@ int ecc_gen_privkey(unsigned int curve_id, unsigned int ndigits, u64 *privkey);
  * @ndigits:		curve's number of digits
  * @private_key:	pregenerated private key for the given curve
  * @public_key:		buffer for storing the generated public key
+ * @nbytes:		number of bytes per coordinate of public key
  *
  * Returns 0 if the public key was generated successfully, a negative value
  * if an error occurred.
  */
 int ecc_make_pub_key(const unsigned int curve_id, unsigned int ndigits,
-		     const u64 *private_key, u64 *public_key);
+		     const u64 *private_key, u8 *public_key,
+		     unsigned int nbytes);
 
 /**
  * crypto_ecdh_shared_secret() - Compute a shared secret
@@ -152,7 +154,9 @@ int ecc_make_pub_key(const unsigned int curve_id, unsigned int ndigits,
  * @ndigits:		curve's number of digits
  * @private_key:	private key of part A
  * @public_key:		public key of counterpart B
+ * @nbytes:		number of bytes per coordinate of public key
  * @secret:		buffer for storing the calculated shared secret
+ * @msd_mask:		optional mask to apply to the most significant digit
  *
  * Note: It is recommended that you hash the result of crypto_ecdh_shared_secret
  * before using it for symmetric encryption or HMAC.
@@ -161,8 +165,8 @@ int ecc_make_pub_key(const unsigned int curve_id, unsigned int ndigits,
  * if an error occurred.
  */
 int crypto_ecdh_shared_secret(unsigned int curve_id, unsigned int ndigits,
-			      const u64 *private_key, const u64 *public_key,
-			      u64 *secret);
+			      const u64 *private_key, const u8 *public_key,
+			      unsigned int nbytes, u8 *secret, u64 msd_mask);
 
 /**
  * ecc_is_pubkey_valid_partial() - Partial public key validation
-- 
2.43.0

[PATCH 14/14] crypto: ecdh - Add support for NIST P521 and add test case

[Stefan Berger]

Implement ecdh support with NIST P521 and add a test case from RFC5903.

Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
---
 crypto/ecdh.c                 | 34 +++++++++++++++
 crypto/testmgr.c              |  7 ++++
 crypto/testmgr.h              | 79 +++++++++++++++++++++++++++++++++++
 include/crypto/internal/ecc.h |  1 +
 4 files changed, 121 insertions(+)

diff --git a/crypto/ecdh.c b/crypto/ecdh.c
index 9f16dbef94d5..ed6c1eff83ce 100644
--- a/crypto/ecdh.c
+++ b/crypto/ecdh.c
@@ -207,6 +207,32 @@ static struct kpp_alg ecdh_nist_p384 = {
 	},
 };
 
+static int ecdh_nist_p521_init_tfm(struct crypto_kpp *tfm)
+{
+	struct ecdh_ctx *ctx = ecdh_get_ctx(tfm);
+
+	ctx->curve_id = ECC_CURVE_NIST_P521;
+	ctx->ndigits = ECC_CURVE_NIST_P521_DIGITS;
+	ctx->nbytes = DIV_ROUND_UP(521, 8);
+	ctx->msd_mask = 0x1ff;
+
+	return 0;
+}
+static struct kpp_alg ecdh_nist_p521 = {
+	.set_secret = ecdh_set_secret,
+	.generate_public_key = ecdh_compute_value,
+	.compute_shared_secret = ecdh_compute_value,
+	.max_size = ecdh_max_size,
+	.init = ecdh_nist_p521_init_tfm,
+	.base = {
+		.cra_name = "ecdh-nist-p521",
+		.cra_driver_name = "ecdh-nist-p521-generic",
+		.cra_priority = 100,
+		.cra_module = THIS_MODULE,
+		.cra_ctxsize = sizeof(struct ecdh_ctx),
+	},
+};
+
 static bool ecdh_nist_p192_registered;
 
 static int __init ecdh_init(void)
@@ -225,8 +251,15 @@ static int __init ecdh_init(void)
 	if (ret)
 		goto nist_p384_error;
 
+	ret = crypto_register_kpp(&ecdh_nist_p521);
+	if (ret)
+		goto nist_p521_error;
+
 	return 0;
 
+nist_p521_error:
+	crypto_unregister_kpp(&ecdh_nist_p384);
+
 nist_p384_error:
 	crypto_unregister_kpp(&ecdh_nist_p256);
 
@@ -242,6 +275,7 @@ static void __exit ecdh_exit(void)
 		crypto_unregister_kpp(&ecdh_nist_p192);
 	crypto_unregister_kpp(&ecdh_nist_p256);
 	crypto_unregister_kpp(&ecdh_nist_p384);
+	crypto_unregister_kpp(&ecdh_nist_p521);
 }
 
 subsys_initcall(ecdh_init);
diff --git a/crypto/testmgr.c b/crypto/testmgr.c
index a017b4ad119b..d1aa0b62f12d 100644
--- a/crypto/testmgr.c
+++ b/crypto/testmgr.c
@@ -5077,6 +5077,13 @@ static const struct alg_test_desc alg_test_descs[] = {
 		.suite = {
 			.kpp = __VECS(ecdh_p384_tv_template)
 		}
+	}, {
+		.alg = "ecdh-nist-p521",
+		.test = alg_test_kpp,
+		.fips_allowed = 1,
+		.suite = {
+			.kpp = __VECS(ecdh_p521_tv_template)
+		}
 	}, {
 		.alg = "ecdsa-nist-p192",
 		.test = alg_test_akcipher,
diff --git a/crypto/testmgr.h b/crypto/testmgr.h
index 9bde04be8df9..dc9a2b30b5fd 100644
--- a/crypto/testmgr.h
+++ b/crypto/testmgr.h
@@ -4468,6 +4468,85 @@ static const struct kpp_testvec ecdh_p384_tv_template[] = {
 	}
 };
 
+/*
+ * NIST P521 test vectors from RFC5903
+ */
+static const struct kpp_testvec ecdh_p521_tv_template[] = {
+	{
+	.secret =
+#ifdef __LITTLE_ENDIAN
+	"\x02\x00" /* type */
+	"\x48\x00" /* len */
+	"\x42\x00" /* key_size */
+#else
+	"\x00\x02" /* type */
+	"\x00\x48" /* len */
+	"\x00\x42" /* key_size */
+#endif
+	"\x00\x37\xAD\xE9\x31\x9A\x89\xF4"
+	"\xDA\xBD\xB3\xEF\x41\x1A\xAC\xCC"
+	"\xA5\x12\x3C\x61\xAC\xAB\x57\xB5"
+	"\x39\x3D\xCE\x47\x60\x81\x72\xA0"
+	"\x95\xAA\x85\xA3\x0F\xE1\xC2\x95"
+	"\x2C\x67\x71\xD9\x37\xBA\x97\x77"
+	"\xF5\x95\x7B\x26\x39\xBA\xB0\x72"
+	"\x46\x2F\x68\xC2\x7A\x57\x38\x2D"
+	"\x4A\x52",
+	.b_public =
+	"\x00\xD0\xB3\x97\x5A\xC4\xB7\x99"
+	"\xF5\xBE\xA1\x6D\x5E\x13\xE9\xAF"
+	"\x97\x1D\x5E\x9B\x98\x4C\x9F\x39"
+	"\x72\x8B\x5E\x57\x39\x73\x5A\x21"
+	"\x9B\x97\xC3\x56\x43\x6A\xDC\x6E"
+	"\x95\xBB\x03\x52\xF6\xBE\x64\xA6"
+	"\xC2\x91\x2D\x4E\xF2\xD0\x43\x3C"
+	"\xED\x2B\x61\x71\x64\x00\x12\xD9"
+	"\x46\x0F"
+	"\x01\x5C\x68\x22\x63\x83\x95\x6E"
+	"\x3B\xD0\x66\xE7\x97\xB6\x23\xC2"
+	"\x7C\xE0\xEA\xC2\xF5\x51\xA1\x0C"
+	"\x2C\x72\x4D\x98\x52\x07\x7B\x87"
+	"\x22\x0B\x65\x36\xC5\xC4\x08\xA1"
+	"\xD2\xAE\xBB\x8E\x86\xD6\x78\xAE"
+	"\x49\xCB\x57\x09\x1F\x47\x32\x29"
+	"\x65\x79\xAB\x44\xFC\xD1\x7F\x0F"
+	"\xC5\x6A",
+	.expected_a_public =
+	"\x00\x15\x41\x7E\x84\xDB\xF2\x8C"
+	"\x0A\xD3\xC2\x78\x71\x33\x49\xDC"
+	"\x7D\xF1\x53\xC8\x97\xA1\x89\x1B"
+	"\xD9\x8B\xAB\x43\x57\xC9\xEC\xBE"
+	"\xE1\xE3\xBF\x42\xE0\x0B\x8E\x38"
+	"\x0A\xEA\xE5\x7C\x2D\x10\x75\x64"
+	"\x94\x18\x85\x94\x2A\xF5\xA7\xF4"
+	"\x60\x17\x23\xC4\x19\x5D\x17\x6C"
+	"\xED\x3E"
+	"\x01\x7C\xAE\x20\xB6\x64\x1D\x2E"
+	"\xEB\x69\x57\x86\xD8\xC9\x46\x14"
+	"\x62\x39\xD0\x99\xE1\x8E\x1D\x5A"
+	"\x51\x4C\x73\x9D\x7C\xB4\xA1\x0A"
+	"\xD8\xA7\x88\x01\x5A\xC4\x05\xD7"
+	"\x79\x9D\xC7\x5E\x7B\x7D\x5B\x6C"
+	"\xF2\x26\x1A\x6A\x7F\x15\x07\x43"
+	"\x8B\xF0\x1B\xEB\x6C\xA3\x92\x6F"
+	"\x95\x82",
+	.expected_ss =
+	"\x01\x14\x4C\x7D\x79\xAE\x69\x56"
+	"\xBC\x8E\xDB\x8E\x7C\x78\x7C\x45"
+	"\x21\xCB\x08\x6F\xA6\x44\x07\xF9"
+	"\x78\x94\xE5\xE6\xB2\xD7\x9B\x04"
+	"\xD1\x42\x7E\x73\xCA\x4B\xAA\x24"
+	"\x0A\x34\x78\x68\x59\x81\x0C\x06"
+	"\xB3\xC7\x15\xA3\xA8\xCC\x31\x51"
+	"\xF2\xBE\xE4\x17\x99\x6D\x19\xF3"
+	"\xDD\xEA",
+	.secret_size = 72,
+	.b_public_size = 132,
+	.expected_a_public_size = 132,
+	.expected_ss_size = 66
+	}
+};
+
 /*
  * MD4 test vectors from RFC1320
  */
diff --git a/include/crypto/internal/ecc.h b/include/crypto/internal/ecc.h
index 29e899fcde8d..6e3e3eec0923 100644
--- a/include/crypto/internal/ecc.h
+++ b/include/crypto/internal/ecc.h
@@ -33,6 +33,7 @@
 #define ECC_CURVE_NIST_P192_DIGITS  3
 #define ECC_CURVE_NIST_P256_DIGITS  4
 #define ECC_CURVE_NIST_P384_DIGITS  6
+#define ECC_CURVE_NIST_P521_DIGITS  9
 #define ECC_MAX_DIGITS              (576 / 64) /* due to NIST P521 */
 
 #define ECC_DIGITS_TO_BYTES_SHIFT 3
-- 
2.43.0