[PATCH 0/3] Add support for x509 certs with NIST p256 and p192 keys

[PATCH 0/3] Add support for x509 certs with NIST p256 and p192 keys

[Stefan Berger]

From: Stefan Berger <stefanb@linux.ibm.com>

This series of patches adds support for x509 certificates signed by a CA
that uses NIST p256 or p192 keys for signing. It also adds support for
certificates where the public key is a NIST p256 or p192 key. The math
for ECDSA signature verification is also added.

Since self-signed certificates are verified upon loading, the following
script can be used for testing:

keyctrl newring test @u

while :; do
	for hash in sha1 sha224 sha256 sha384 sha512; do
		openssl req \
			-x509 \
			-${hash} \
			-newkey ec \
			-pkeyopt ec_paramgen_curve:prime256v1 \
			-keyout key.pem \
			-days 365 \
			-subj '/CN=test' \
			-nodes \
			-outform der \
			-out cert.der
		keyctl padd asymmetric testkey %keyring:test < cert.der
		if [ $? -ne 0 ]; then
			echo "ERROR"
			exit 1
		fi
	done
done

It also works with restricted keyrings where an RSA key is used to sign
a NIST P256/P192 key:



The ECDSA signature verification will be used by IMA Appraisal where ECDSA
file signatures stored in RPM packages will use substantially less space
than if RSA signatures were to be used.

   Stefan

Stefan Berger (3):
  x509: Add support for parsing x509 certs with NIST p256 keys
  x509: Add support for NIST p192 keys in certificates and akcipher
  x509: Detect sm2 keys by their parameters OID

 crypto/Makefile                           |   9 +-
 crypto/asymmetric_keys/public_key.c       |  19 ++
 crypto/asymmetric_keys/x509_cert_parser.c |  45 ++-
 crypto/ecc.c                              | 331 ++++++++++++++++++++++
 crypto/ecc.h                              |   2 +
 crypto/ecc_curve_defs.h                   |   4 +
 crypto/eccsignature.asn1                  |   4 +
 include/linux/oid_registry.h              |   6 +
 8 files changed, 417 insertions(+), 3 deletions(-)
 create mode 100644 crypto/eccsignature.asn1

-- 
2.25.4

[PATCH 1/3] x509: Add support for parsing x509 certs with NIST p256 keys

[Stefan Berger]

From: Stefan Berger <stefanb@linux.ibm.com>

This patch adds support for parsing of x509 certificates that contain
NIST P256 keys that have been signed by a CA using any of the current SHA
hash algorithms. Since self-signed certificates are verified, the ecc math
for signature verification is also added.

Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
---
 crypto/Makefile                           |   9 +-
 crypto/asymmetric_keys/public_key.c       |  16 ++
 crypto/asymmetric_keys/x509_cert_parser.c |  39 ++-
 crypto/ecc.c                              | 297 ++++++++++++++++++++++
 crypto/ecc.h                              |   2 +
 crypto/ecc_curve_defs.h                   |   4 +
 crypto/eccsignature.asn1                  |   4 +
 include/linux/oid_registry.h              |   5 +
 8 files changed, 374 insertions(+), 2 deletions(-)
 create mode 100644 crypto/eccsignature.asn1

diff --git a/crypto/Makefile b/crypto/Makefile
index b279483fba50..09ae06235274 100644
--- a/crypto/Makefile
+++ b/crypto/Makefile
@@ -50,6 +50,14 @@ sm2_generic-y += sm2.o
 
 obj-$(CONFIG_CRYPTO_SM2) += sm2_generic.o
 
+$(obj)/eccsignature.asn1.o: $(obj)/eccsignature.asn1.c $(obj)/eccsignature.asn1.h
+$(obj)/ecc.o: $(obj)/sm2signature.asn1.h
+
+ecc_generic-y += eccsignature.asn1.o
+ecc_generic-y += ecc.o
+
+obj-$(CONFIG_CRYPTO_ECC) += ecc_generic.o
+
 crypto_acompress-y := acompress.o
 crypto_acompress-y += scompress.o
 obj-$(CONFIG_CRYPTO_ACOMP2) += crypto_acompress.o
@@ -172,7 +180,6 @@ obj-$(CONFIG_CRYPTO_USER_API_RNG) += algif_rng.o
 obj-$(CONFIG_CRYPTO_USER_API_AEAD) += algif_aead.o
 obj-$(CONFIG_CRYPTO_ZSTD) += zstd.o
 obj-$(CONFIG_CRYPTO_OFB) += ofb.o
-obj-$(CONFIG_CRYPTO_ECC) += ecc.o
 obj-$(CONFIG_CRYPTO_ESSIV) += essiv.o
 obj-$(CONFIG_CRYPTO_CURVE25519) += curve25519-generic.o
 
diff --git a/crypto/asymmetric_keys/public_key.c b/crypto/asymmetric_keys/public_key.c
index 8892908ad58c..0fcbaec0ded0 100644
--- a/crypto/asymmetric_keys/public_key.c
+++ b/crypto/asymmetric_keys/public_key.c
@@ -90,6 +90,22 @@ int software_key_determine_akcipher(const char *encoding,
 		return 0;
 	}
 
+	if (strcmp(encoding, "x962") == 0) {
+		enum OID oid;
+
+		if (pkey->paramlen < 2)
+			return -EINVAL;
+
+		oid = look_up_OID(pkey->params + 2, pkey->paramlen - 2);
+		switch (oid) {
+		case OID_id_prime256v1:
+			strcpy(alg_name, "nist_p256");
+			return 0;
+		default:
+			return -EINVAL;
+		}
+	}
+
 	return -ENOPKG;
 }
 
diff --git a/crypto/asymmetric_keys/x509_cert_parser.c b/crypto/asymmetric_keys/x509_cert_parser.c
index 52c9b455fc7d..44bae5ccb475 100644
--- a/crypto/asymmetric_keys/x509_cert_parser.c
+++ b/crypto/asymmetric_keys/x509_cert_parser.c
@@ -203,6 +203,26 @@ int x509_note_pkey_algo(void *context, size_t hdrlen,
 	default:
 		return -ENOPKG; /* Unsupported combination */
 
+	case OID_id_ecdsa_with_sha1:
+		ctx->cert->sig->hash_algo = "sha1";
+		goto ecdsa;
+
+	case OID_id_ecdsa_with_sha224:
+		ctx->cert->sig->hash_algo = "sha224";
+		goto ecdsa;
+
+	case OID_id_ecdsa_with_sha256:
+		ctx->cert->sig->hash_algo = "sha256";
+		goto ecdsa;
+
+	case OID_id_ecdsa_with_sha384:
+		ctx->cert->sig->hash_algo = "sha384";
+		goto ecdsa;
+
+	case OID_id_ecdsa_with_sha512:
+		ctx->cert->sig->hash_algo = "sha512";
+		goto ecdsa;
+
 	case OID_md4WithRSAEncryption:
 		ctx->cert->sig->hash_algo = "md4";
 		goto rsa_pkcs1;
@@ -255,6 +275,11 @@ int x509_note_pkey_algo(void *context, size_t hdrlen,
 	ctx->cert->sig->encoding = "raw";
 	ctx->algo_oid = ctx->last_oid;
 	return 0;
+ecdsa:
+	ctx->cert->sig->pkey_algo = "ecdsa";
+	ctx->cert->sig->encoding = "x962";
+	ctx->algo_oid = ctx->last_oid;
+	return 0;
 }
 
 /*
@@ -276,7 +301,8 @@ int x509_note_signature(void *context, size_t hdrlen,
 
 	if (strcmp(ctx->cert->sig->pkey_algo, "rsa") == 0 ||
 	    strcmp(ctx->cert->sig->pkey_algo, "ecrdsa") == 0 ||
-	    strcmp(ctx->cert->sig->pkey_algo, "sm2") == 0) {
+	    strcmp(ctx->cert->sig->pkey_algo, "sm2") == 0 ||
+	    strcmp(ctx->cert->sig->pkey_algo, "ecdsa") == 0) {
 		/* Discard the BIT STRING metadata */
 		if (vlen < 1 || *(const u8 *)value != 0)
 			return -EBADMSG;
@@ -471,6 +497,17 @@ int x509_extract_key_data(void *context, size_t hdrlen,
 		break;
 	case OID_id_ecPublicKey:
 		ctx->cert->pub->pkey_algo = "sm2";
+		if (ctx->params_size > 2) {
+			enum OID oid = look_up_OID(ctx->params + 2,
+						   ctx->params_size - 2);
+			switch (oid) {
+			case OID_id_prime256v1:
+				ctx->cert->pub->pkey_algo = "ecdsa";
+				break;
+			default:
+				break;
+			}
+		}
 		break;
 	default:
 		return -ENOPKG;
diff --git a/crypto/ecc.c b/crypto/ecc.c
index c80aa25994a0..fb8370720350 100644
--- a/crypto/ecc.c
+++ b/crypto/ecc.c
@@ -29,13 +29,17 @@
 #include <linux/slab.h>
 #include <linux/swab.h>
 #include <linux/fips.h>
+#include <crypto/internal/akcipher.h>
+#include <crypto/akcipher.h>
 #include <crypto/ecdh.h>
 #include <crypto/rng.h>
 #include <asm/unaligned.h>
 #include <linux/ratelimit.h>
+#include <linux/asn1_decoder.h>
 
 #include "ecc.h"
 #include "ecc_curve_defs.h"
+#include "eccsignature.asn1.h"
 
 typedef struct {
 	u64 m_low;
@@ -840,6 +844,21 @@ static void vli_mod_mult_fast(u64 *result, const u64 *left, const u64 *right,
 	vli_mmod_fast(result, product, curve_prime, ndigits);
 }
 
+/* Computes result = value % curve_prime.
+ * Expands value to double the size for vli_mmod_fast.
+ */
+static void vli_mod_fast(u64 *result, const u64 *val, const u64 *curve_prime,
+			 unsigned int ndigits)
+{
+	u64 tmp[2 * ECC_MAX_DIGITS];
+
+	memcpy(tmp, val, ndigits << ECC_DIGITS_TO_BYTES_SHIFT);
+	memset(&tmp[ndigits], 0,
+	       (ndigits << 1) << ECC_DIGITS_TO_BYTES_SHIFT);
+
+	vli_mmod_fast(result, tmp, curve_prime, ndigits);
+}
+
 /* Computes result = left^2 % curve_prime. */
 static void vli_mod_square_fast(u64 *result, const u64 *left,
 				const u64 *curve_prime, unsigned int ndigits)
@@ -1542,4 +1561,282 @@ int crypto_ecdh_shared_secret(unsigned int curve_id, unsigned int ndigits,
 }
 EXPORT_SYMBOL(crypto_ecdh_shared_secret);
 
+struct ecc_ctx {
+	unsigned int curve_id;
+	const struct ecc_curve *curve;
+	struct ecc_point *pub_key;
+};
+
+struct ecdsa_signature_ctx {
+	const struct ecc_curve *curve;
+	u64 r[ECC_MAX_DIGITS];
+	u64 s[ECC_MAX_DIGITS];
+};
+
+/*
+ * Get the r and s components of a signature from the X509 certificate.
+ */
+static int ecc_get_signature_rs(u64 *dest, size_t hdrlen, unsigned char tag,
+				const void *value, size_t vlen,
+				unsigned int ndigits)
+{
+	size_t keylen = ndigits * sizeof(u64);
+	ssize_t diff = vlen - keylen;
+	const char *d = value;
+	u8 rs[ECC_MAX_BYTES];
+
+	if (!value || !vlen)
+		return -EINVAL;
+
+	/* diff = 0: 'value' has exacly the right size
+	 * diff > 0: 'value' has too many bytes; '1' leading zero is allowed that
+	 *           makes the value a positive integer; error on more
+	 * diff < 0: 'value' is missing leading zeros, which we add
+	 */
+	if (diff > 0) {
+		/* skip over leading zeros that make 'value' a positive int */
+		if (*d == 0) {
+			vlen -= 1;
+			diff--;
+			d++;
+		}
+		if (diff)
+			return -EINVAL;
+	}
+	if (-diff >= keylen)
+		return -EINVAL;
+
+	if (diff) {
+		/* leading zeros not given in 'value' */
+		memset(rs, 0, -diff);
+	}
+
+	memcpy(&rs[-diff], d, vlen);
+
+	ecc_swap_digits((u64 *)rs, dest, ndigits);
+
+	return 0;
+}
+
+int ecc_get_signature_r(void *context, size_t hdrlen, unsigned char tag,
+			const void *value, size_t vlen)
+{
+	struct ecdsa_signature_ctx *sig = context;
+
+	return ecc_get_signature_rs(sig->r, hdrlen, tag, value, vlen,
+				    sig->curve->g.ndigits);
+}
+
+int ecc_get_signature_s(void *context, size_t hdrlen, unsigned char tag,
+			const void *value, size_t vlen)
+{
+	struct ecdsa_signature_ctx *sig = context;
+
+	return ecc_get_signature_rs(sig->s, hdrlen, tag, value, vlen,
+				    sig->curve->g.ndigits);
+}
+
+static int _ecdsa_verify(struct ecc_ctx *ctx, const u64 *hash,
+			 const u64 *r, const u64 *s)
+{
+	const struct ecc_curve *curve = ctx->curve;
+	unsigned int ndigits = curve->g.ndigits;
+	u64 s1[ECC_MAX_DIGITS];
+	u64 u1[ECC_MAX_DIGITS];
+	u64 u2[ECC_MAX_DIGITS];
+	u64 x1[ECC_MAX_DIGITS];
+	u64 y1[ECC_MAX_DIGITS];
+	struct ecc_point res = ECC_POINT_INIT(x1, y1, ndigits);
+
+	/* 0 < r < n  and 0 < s < n */
+	if (vli_is_zero(r, ndigits) || vli_cmp(r, curve->n, ndigits) >= 0 ||
+	    vli_is_zero(s, ndigits) || vli_cmp(s, curve->n, ndigits) >= 0)
+		return -EBADMSG;
+
+	/* hash is given */
+	pr_devel("hash : %016llx %016llx ... %016llx\n",
+		 hash[ndigits - 1], hash[ndigits - 2], hash[0]);
+
+	/* s1 = (s^-1) mod n */
+	vli_mod_inv(s1, s, curve->n, ndigits);
+	/* u1 = (hash * s1) mod n */
+	vli_mod_mult_slow(u1, hash, s1, curve->n, ndigits);
+	/* u2 = (r * s1) mod n */
+	vli_mod_mult_slow(u2, r, s1, curve->n, ndigits);
+	/* res = u1*G + u2 * pub_key */
+	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))
+		vli_mod_fast(res.x, res.x, curve->n, ndigits);
+
+	if (!vli_cmp(res.x, r, ndigits))
+		return 0;
+
+	return -EKEYREJECTED;
+}
+
+/*
+ * Verify and ECDSA signature.
+ */
+static int ecdsa_verify(struct akcipher_request *req)
+{
+	struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
+	struct ecc_ctx *ctx = akcipher_tfm_ctx(tfm);
+	size_t keylen = ctx->curve->g.ndigits * sizeof(u64);
+	struct ecdsa_signature_ctx sig_ctx = {
+		.curve = ctx->curve,
+	};
+	u8 rawhash[ECC_MAX_BYTES];
+	u64 hash[ECC_MAX_DIGITS];
+	unsigned char *buffer;
+	ssize_t diff;
+	int ret;
+
+	if (unlikely(!ctx->pub_key))
+		return -EINVAL;
+
+	buffer = kmalloc(req->src_len + req->dst_len, GFP_KERNEL);
+	if (!buffer)
+		return -ENOMEM;
+
+	sg_pcopy_to_buffer(req->src,
+		sg_nents_for_len(req->src, req->src_len + req->dst_len),
+		buffer, req->src_len + req->dst_len, 0);
+
+	ret = asn1_ber_decoder(&eccsignature_decoder, &sig_ctx,
+			       buffer, req->src_len);
+	if (ret < 0)
+		goto error;
+
+	/* if the hash is shorter then we will add leading zeros to fit to ndigits */
+	diff = keylen - req->dst_len;
+	if (diff >= 0) {
+		if (diff)
+			memset(rawhash, 0, diff);
+		memcpy(&rawhash[diff], buffer + req->src_len, req->dst_len);
+	} else if (diff < 0) {
+		/* given hash is longer, we take the left-most bytes */
+		memcpy(&rawhash, buffer + req->src_len, keylen);
+	}
+
+	ecc_swap_digits((u64 *)rawhash, hash, ctx->curve->g.ndigits);
+
+	ret = _ecdsa_verify(ctx, hash, sig_ctx.r, sig_ctx.s);
+
+error:
+	kfree(buffer);
+
+	return ret;
+}
+
+static int ecc_ec_ctx_init(struct ecc_ctx *ctx, unsigned int curve_id)
+{
+	ctx->curve_id = curve_id;
+	ctx->curve = ecc_get_curve(curve_id);
+	if (!ctx->curve)
+		return -EINVAL;
+
+	return 0;
+}
+
+static void ecc_ec_ctx_deinit(struct ecc_ctx *ctx)
+{
+	ecc_free_point(ctx->pub_key);
+	ctx->pub_key = NULL;
+}
+
+static int ecc_ec_ctx_reset(struct ecc_ctx *ctx)
+{
+	unsigned int curve_id = ctx->curve_id;
+
+	ecc_ec_ctx_deinit(ctx);
+	return ecc_ec_ctx_init(ctx, curve_id);
+}
+
+/*
+ * Set the public key given the raw uncompressed key data from an X509
+ * certificate. The key data contain the concatenated X and Y coordinates of
+ * the public key.
+ */
+static int ecc_set_pub_key(struct crypto_akcipher *tfm,
+			   const void *key, unsigned int keylen)
+{
+	struct ecc_ctx *ctx = akcipher_tfm_ctx(tfm);
+	const unsigned char *d = key;
+	const u64 *digits = (const u64 *)&d[1];
+	unsigned int ndigits;
+	int ret;
+
+	ret = ecc_ec_ctx_reset(ctx);
+	if (ret < 0)
+		return ret;
+
+	if (keylen < 1 || (((keylen - 1) >> 1) % sizeof(u64)) != 0)
+		return -EINVAL;
+	/* we only accept uncompressed format */
+	if (d[0] != 4)
+		return -EINVAL;
+
+	keylen--;
+	ndigits = (keylen >> 1) / sizeof(u64);
+	if (ndigits != ctx->curve->g.ndigits)
+		return -EINVAL;
+
+	ctx->pub_key = ecc_alloc_point(ndigits);
+	if (!ctx->pub_key)
+		return -ENOMEM;
+
+	ecc_swap_digits(digits, ctx->pub_key->x, ndigits);
+	ecc_swap_digits(&digits[ndigits], ctx->pub_key->y, ndigits);
+	return ecc_is_pubkey_valid_full(ctx->curve, ctx->pub_key);
+}
+
+static void ecc_exit_tfm(struct crypto_akcipher *tfm)
+{
+	struct ecc_ctx *ctx = akcipher_tfm_ctx(tfm);
+
+	ecc_ec_ctx_deinit(ctx);
+}
+
+static unsigned int ecc_nist_p256_max_size(struct crypto_akcipher *tfm)
+{
+	return NIST_P256_KEY_SIZE;
+}
+
+static int ecc_nist_p256_init_tfm(struct crypto_akcipher *tfm)
+{
+	struct ecc_ctx *ctx = akcipher_tfm_ctx(tfm);
+
+	return ecc_ec_ctx_init(ctx, ECC_CURVE_NIST_P256);
+}
+
+static struct akcipher_alg ecc_nist_p256 = {
+	.verify = ecdsa_verify,
+	.set_pub_key = ecc_set_pub_key,
+	.max_size = ecc_nist_p256_max_size,
+	.init = ecc_nist_p256_init_tfm,
+	.exit = ecc_exit_tfm,
+	.base = {
+		.cra_name = "nist_p256",
+		.cra_driver_name = "ecc-nist-p256",
+		.cra_priority = 100,
+		.cra_module = THIS_MODULE,
+		.cra_ctxsize = sizeof(struct ecc_ctx),
+	},
+};
+
+static int ecc_init(void)
+{
+	return crypto_register_akcipher(&ecc_nist_p256);
+}
+
+static void ecc_exit(void)
+{
+	crypto_unregister_akcipher(&ecc_nist_p256);
+}
+
+subsys_initcall(ecc_init);
+module_exit(ecc_exit);
+
 MODULE_LICENSE("Dual BSD/GPL");
diff --git a/crypto/ecc.h b/crypto/ecc.h
index d4e546b9ad79..26d7c83908bc 100644
--- a/crypto/ecc.h
+++ b/crypto/ecc.h
@@ -33,6 +33,8 @@
 
 #define ECC_DIGITS_TO_BYTES_SHIFT 3
 
+#define ECC_MAX_BYTES (ECC_MAX_DIGITS << ECC_DIGITS_TO_BYTES_SHIFT)
+
 /**
  * struct ecc_point - elliptic curve point in affine coordinates
  *
diff --git a/crypto/ecc_curve_defs.h b/crypto/ecc_curve_defs.h
index 69be6c7d228f..562651f28ef5 100644
--- a/crypto/ecc_curve_defs.h
+++ b/crypto/ecc_curve_defs.h
@@ -28,6 +28,8 @@ static struct ecc_curve nist_p192 = {
 	.b = nist_p192_b
 };
 
+#define NIST_P192_KEY_SIZE 24
+
 /* NIST P-256: a = p - 3 */
 static u64 nist_p256_g_x[] = { 0xF4A13945D898C296ull, 0x77037D812DEB33A0ull,
 				0xF8BCE6E563A440F2ull, 0x6B17D1F2E12C4247ull };
@@ -54,4 +56,6 @@ static struct ecc_curve nist_p256 = {
 	.b = nist_p256_b
 };
 
+#define NIST_P256_KEY_SIZE 32
+
 #endif
diff --git a/crypto/eccsignature.asn1 b/crypto/eccsignature.asn1
new file mode 100644
index 000000000000..e6c82381f19d
--- /dev/null
+++ b/crypto/eccsignature.asn1
@@ -0,0 +1,4 @@
+ECDSASignature ::= SEQUENCE {
+	r	INTEGER ({ ecc_get_signature_r }),
+	s	INTEGER ({ ecc_get_signature_s })
+}
diff --git a/include/linux/oid_registry.h b/include/linux/oid_registry.h
index 4462ed2c18cd..9060f19c80eb 100644
--- a/include/linux/oid_registry.h
+++ b/include/linux/oid_registry.h
@@ -21,6 +21,11 @@ enum OID {
 	OID_id_dsa,			/* 1.2.840.10040.4.1 */
 	OID_id_ecdsa_with_sha1,		/* 1.2.840.10045.4.1 */
 	OID_id_ecPublicKey,		/* 1.2.840.10045.2.1 */
+	OID_id_prime256v1,		/* 1.2.840.10045.3.1.7 */
+	OID_id_ecdsa_with_sha224,	/* 1.2.840.10045.4.3.1 */
+	OID_id_ecdsa_with_sha256,	/* 1.2.840.10045.4.3.2 */
+	OID_id_ecdsa_with_sha384,	/* 1.2.840.10045.4.3.3 */
+	OID_id_ecdsa_with_sha512,	/* 1.2.840.10045.4.3.4 */
 
 	/* PKCS#1 {iso(1) member-body(2) us(840) rsadsi(113549) pkcs(1) pkcs-1(1)} */
 	OID_rsaEncryption,		/* 1.2.840.113549.1.1.1 */
-- 
2.25.4

[PATCH 2/3] x509: Add support for NIST p192 keys in certificates and akcipher

[Stefan Berger]

From: Stefan Berger <stefanb@linux.ibm.com>

Add support for NIST p192 keys in x509 certificates and support it in
'akcipher'.

Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
---
 crypto/asymmetric_keys/public_key.c       |  3 ++
 crypto/asymmetric_keys/x509_cert_parser.c |  1 +
 crypto/ecc.c                              | 36 ++++++++++++++++++++++-
 include/linux/oid_registry.h              |  1 +
 4 files changed, 40 insertions(+), 1 deletion(-)

diff --git a/crypto/asymmetric_keys/public_key.c b/crypto/asymmetric_keys/public_key.c
index 0fcbaec0ded0..bb4a7cc0e3c8 100644
--- a/crypto/asymmetric_keys/public_key.c
+++ b/crypto/asymmetric_keys/public_key.c
@@ -98,6 +98,9 @@ int software_key_determine_akcipher(const char *encoding,
 
 		oid = look_up_OID(pkey->params + 2, pkey->paramlen - 2);
 		switch (oid) {
+		case OID_id_prime192v1:
+			strcpy(alg_name, "nist_p192");
+			return 0;
 		case OID_id_prime256v1:
 			strcpy(alg_name, "nist_p256");
 			return 0;
diff --git a/crypto/asymmetric_keys/x509_cert_parser.c b/crypto/asymmetric_keys/x509_cert_parser.c
index 44bae5ccb475..720cc7977077 100644
--- a/crypto/asymmetric_keys/x509_cert_parser.c
+++ b/crypto/asymmetric_keys/x509_cert_parser.c
@@ -501,6 +501,7 @@ int x509_extract_key_data(void *context, size_t hdrlen,
 			enum OID oid = look_up_OID(ctx->params + 2,
 						   ctx->params_size - 2);
 			switch (oid) {
+			case OID_id_prime192v1:
 			case OID_id_prime256v1:
 				ctx->cert->pub->pkey_algo = "ecdsa";
 				break;
diff --git a/crypto/ecc.c b/crypto/ecc.c
index fb8370720350..79df35a23a61 100644
--- a/crypto/ecc.c
+++ b/crypto/ecc.c
@@ -1826,13 +1826,47 @@ static struct akcipher_alg ecc_nist_p256 = {
 	},
 };
 
+static unsigned int ecc_nist_p192_max_size(struct crypto_akcipher *tfm)
+{
+	return NIST_P192_KEY_SIZE;
+}
+
+static int ecc_nist_p192_init_tfm(struct crypto_akcipher *tfm)
+{
+	struct ecc_ctx *ctx = akcipher_tfm_ctx(tfm);
+
+	return ecc_ec_ctx_init(ctx, ECC_CURVE_NIST_P192);
+}
+
+static struct akcipher_alg ecc_nist_p192 = {
+	.verify = ecdsa_verify,
+	.set_pub_key = ecc_set_pub_key,
+	.max_size = ecc_nist_p192_max_size,
+	.init = ecc_nist_p192_init_tfm,
+	.exit = ecc_exit_tfm,
+	.base = {
+		.cra_name = "nist_p192",
+		.cra_driver_name = "ecc-nist-p192",
+		.cra_priority = 100,
+		.cra_module = THIS_MODULE,
+		.cra_ctxsize = sizeof(struct ecc_ctx),
+	},
+};
+
 static int ecc_init(void)
 {
-	return crypto_register_akcipher(&ecc_nist_p256);
+	int ret;
+
+	ret = crypto_register_akcipher(&ecc_nist_p256);
+	if (ret)
+		return ret;
+
+	return crypto_register_akcipher(&ecc_nist_p192);
 }
 
 static void ecc_exit(void)
 {
+	crypto_unregister_akcipher(&ecc_nist_p192);
 	crypto_unregister_akcipher(&ecc_nist_p256);
 }
 
diff --git a/include/linux/oid_registry.h b/include/linux/oid_registry.h
index 9060f19c80eb..e8071133d0e2 100644
--- a/include/linux/oid_registry.h
+++ b/include/linux/oid_registry.h
@@ -21,6 +21,7 @@ enum OID {
 	OID_id_dsa,			/* 1.2.840.10040.4.1 */
 	OID_id_ecdsa_with_sha1,		/* 1.2.840.10045.4.1 */
 	OID_id_ecPublicKey,		/* 1.2.840.10045.2.1 */
+	OID_id_prime192v1,		/* 1.2.840.10045.3.1.1 */
 	OID_id_prime256v1,		/* 1.2.840.10045.3.1.7 */
 	OID_id_ecdsa_with_sha224,	/* 1.2.840.10045.4.3.1 */
 	OID_id_ecdsa_with_sha256,	/* 1.2.840.10045.4.3.2 */
-- 
2.25.4

[PATCH 3/3] x509: Detect sm2 keys by their parameters OID

[Stefan Berger]

From: Stefan Berger <stefanb@linux.ibm.com>

Detect whether a key is a sm2 type of key by its OID in the parameters
array.

Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
---
 crypto/asymmetric_keys/x509_cert_parser.c | 27 +++++++++++++----------
 1 file changed, 15 insertions(+), 12 deletions(-)

diff --git a/crypto/asymmetric_keys/x509_cert_parser.c b/crypto/asymmetric_keys/x509_cert_parser.c
index 720cc7977077..82e331da5041 100644
--- a/crypto/asymmetric_keys/x509_cert_parser.c
+++ b/crypto/asymmetric_keys/x509_cert_parser.c
@@ -485,6 +485,7 @@ int x509_extract_key_data(void *context, size_t hdrlen,
 			  const void *value, size_t vlen)
 {
 	struct x509_parse_context *ctx = context;
+	enum OID oid;
 
 	ctx->key_algo = ctx->last_oid;
 	switch (ctx->last_oid) {
@@ -496,18 +497,20 @@ int x509_extract_key_data(void *context, size_t hdrlen,
 		ctx->cert->pub->pkey_algo = "ecrdsa";
 		break;
 	case OID_id_ecPublicKey:
-		ctx->cert->pub->pkey_algo = "sm2";
-		if (ctx->params_size > 2) {
-			enum OID oid = look_up_OID(ctx->params + 2,
-						   ctx->params_size - 2);
-			switch (oid) {
-			case OID_id_prime192v1:
-			case OID_id_prime256v1:
-				ctx->cert->pub->pkey_algo = "ecdsa";
-				break;
-			default:
-				break;
-			}
+		if (ctx->params_size < 2)
+			return -ENOPKG;
+
+		oid = look_up_OID(ctx->params + 2, ctx->params_size - 2);
+		switch (oid) {
+		case OID_id_prime192v1:
+		case OID_id_prime256v1:
+			ctx->cert->pub->pkey_algo = "ecdsa";
+			break;
+		case OID_sm2:
+			ctx->cert->pub->pkey_algo = "sm2";
+			break;
+		default:
+			return -ENOPKG;
 		}
 		break;
 	default:
-- 
2.25.4