linux-kernel - [PATCH v3 3/4] crypto: ecdh

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Date:   Sat, 22 May 2021 10:44:30 +0800
From:   Hui Tang <tanghui20@...wei.com>
To:     <herbert@...dor.apana.org.au>, <davem@...emloft.net>
CC:     <linux-crypto@...r.kernel.org>, <xuzaibo@...wei.com>,
        <wangzhou1@...ilicon.com>, <linux-kernel@...r.kernel.org>
Subject: [PATCH v3 3/4] crypto: ecdh - register NIST P384 tfm

Add ecdh_nist_p384_init_tfm and register and unregister P384 tfm.

Signed-off-by: Hui Tang <tanghui20@...wei.com>
---
 crypto/ecdh.c | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/crypto/ecdh.c b/crypto/ecdh.c
index e2c4808..70f312e 100644
--- a/crypto/ecdh.c
+++ b/crypto/ecdh.c
@@ -173,6 +173,31 @@ static struct kpp_alg ecdh_nist_p256 = {
 	},
 };
 
+static int ecdh_nist_p384_init_tfm(struct crypto_kpp *tfm)
+{
+	struct ecdh_ctx *ctx = ecdh_get_ctx(tfm);
+
+	ctx->curve_id = ECC_CURVE_NIST_P384;
+	ctx->ndigits = ECC_CURVE_NIST_P384_DIGITS;
+
+	return 0;
+}
+
+static struct kpp_alg ecdh_nist_p384 = {
+	.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_p384_init_tfm,
+	.base = {
+		.cra_name = "ecdh-nist-p384",
+		.cra_driver_name = "ecdh-nist-p384-generic",
+		.cra_priority = 100,
+		.cra_module = THIS_MODULE,
+		.cra_ctxsize = sizeof(struct ecdh_ctx),
+	},
+};
+
 static bool ecdh_nist_p192_registered;
 
 static int ecdh_init(void)
@@ -187,8 +212,15 @@ static int ecdh_init(void)
 	if (ret)
 		goto nist_p256_error;
 
+	ret = crypto_register_kpp(&ecdh_nist_p384);
+	if (ret)
+		goto nist_p384_error;
+
 	return 0;
 
+nist_p384_error:
+	crypto_unregister_kpp(&ecdh_nist_p256);
+
 nist_p256_error:
 	if (ecdh_nist_p192_registered)
 		crypto_unregister_kpp(&ecdh_nist_p192);
@@ -200,6 +232,7 @@ static void ecdh_exit(void)
 	if (ecdh_nist_p192_registered)
 		crypto_unregister_kpp(&ecdh_nist_p192);
 	crypto_unregister_kpp(&ecdh_nist_p256);
+	crypto_unregister_kpp(&ecdh_nist_p384);
 }
 
 subsys_initcall(ecdh_init);
-- 
2.8.1