linux-kernel - [PATCH 2/4] crypto: pkcs8 parser support ECDSA private keys

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Date:   Fri, 17 Jun 2022 15:07:52 +0800
From:   Lei He <helei.sig11@...edance.com>
To:     herbert@...dor.apana.org.au, davem@...emloft.net,
        dhowells@...hat.com, mst@...hat.com
Cc:     arei.gonglei@...wei.com, jasowang@...hat.com,
        linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org,
        pizhenwei@...edance.com, helei.sig11@...edance.com,
        f4bug@...at.org, berrange@...hat.com
Subject: [PATCH 2/4] crypto: pkcs8 parser support ECDSA private keys

From: lei he <helei.sig11@...edance.com>

Make pkcs8_private_key_parser can identify ECDSA private keys.

Signed-off-by: lei he <helei.sig11@...edance.com>
---
 crypto/akcipher.c                     | 10 ++++++
 crypto/asymmetric_keys/pkcs8.asn1     |  2 +-
 crypto/asymmetric_keys/pkcs8_parser.c | 45 +++++++++++++++++++++++++--
 3 files changed, 53 insertions(+), 4 deletions(-)

diff --git a/crypto/akcipher.c b/crypto/akcipher.c
index f866085c8a4a..3adcdc6d48c2 100644
--- a/crypto/akcipher.c
+++ b/crypto/akcipher.c
@@ -120,6 +120,12 @@ static int akcipher_default_op(struct akcipher_request *req)
 	return -ENOSYS;
 }
 
+static int akcipher_default_set_key(struct crypto_akcipher *tfm,
+				    const void *key, unsigned int keylen)
+{
+	return -ENOSYS;
+}
+
 int crypto_register_akcipher(struct akcipher_alg *alg)
 {
 	struct crypto_alg *base = &alg->base;
@@ -132,6 +138,10 @@ int crypto_register_akcipher(struct akcipher_alg *alg)
 		alg->encrypt = akcipher_default_op;
 	if (!alg->decrypt)
 		alg->decrypt = akcipher_default_op;
+	if (!alg->set_pub_key)
+		alg->set_pub_key = akcipher_default_set_key;
+	if (!alg->set_priv_key)
+		alg->set_priv_key = akcipher_default_set_key;
 
 	akcipher_prepare_alg(alg);
 	return crypto_register_alg(base);
diff --git a/crypto/asymmetric_keys/pkcs8.asn1 b/crypto/asymmetric_keys/pkcs8.asn1
index 702c41a3c713..1791ddf4168a 100644
--- a/crypto/asymmetric_keys/pkcs8.asn1
+++ b/crypto/asymmetric_keys/pkcs8.asn1
@@ -20,5 +20,5 @@ Attribute ::= ANY
 
 AlgorithmIdentifier ::= SEQUENCE {
 	algorithm   OBJECT IDENTIFIER ({ pkcs8_note_OID }),
-	parameters  ANY OPTIONAL
+	parameters  ANY OPTIONAL ({ pkcs8_note_algo_parameter })
 }
diff --git a/crypto/asymmetric_keys/pkcs8_parser.c b/crypto/asymmetric_keys/pkcs8_parser.c
index 105dcce27f71..e507c635ead5 100644
--- a/crypto/asymmetric_keys/pkcs8_parser.c
+++ b/crypto/asymmetric_keys/pkcs8_parser.c
@@ -24,6 +24,8 @@ struct pkcs8_parse_context {
 	enum OID	algo_oid;		/* Algorithm OID */
 	u32		key_size;
 	const void	*key;
+	const void	*algo_param;
+	u32		algo_param_len;
 };
 
 /*
@@ -47,6 +49,17 @@ int pkcs8_note_OID(void *context, size_t hdrlen,
 	return 0;
 }
 
+int pkcs8_note_algo_parameter(void *context, size_t hdrlen,
+			      unsigned char tag,
+			      const void *value, size_t vlen)
+{
+	struct pkcs8_parse_context *ctx = context;
+
+	ctx->algo_param = value;
+	ctx->algo_param_len = vlen;
+	return 0;
+}
+
 /*
  * Note the version number of the ASN.1 blob.
  */
@@ -69,11 +82,37 @@ int pkcs8_note_algo(void *context, size_t hdrlen,
 		    const void *value, size_t vlen)
 {
 	struct pkcs8_parse_context *ctx = context;
-
-	if (ctx->last_oid != OID_rsaEncryption)
+	enum OID curve_id;
+
+	switch (ctx->last_oid) {
+	case OID_id_ecPublicKey:
+		if (!ctx->algo_param || ctx->algo_param_len == 0)
+			return -EBADMSG;
+		curve_id = look_up_OID(ctx->algo_param, ctx->algo_param_len);
+
+		switch (curve_id) {
+		case OID_id_prime192v1:
+			ctx->pub->pkey_algo = "ecdsa-nist-p192";
+			break;
+		case OID_id_prime256v1:
+			ctx->pub->pkey_algo = "ecdsa-nist-p256";
+			break;
+		case OID_id_ansip384r1:
+			ctx->pub->pkey_algo = "ecdsa-nist-p384";
+			break;
+		default:
+			return -ENOPKG;
+		}
+		break;
+
+	case OID_rsaEncryption:
+		ctx->pub->pkey_algo = "rsa";
+		break;
+
+	default:
 		return -ENOPKG;
+	}
 
-	ctx->pub->pkey_algo = "rsa";
 	return 0;
 }
 
-- 
2.20.1