From aa4d426b4d3527d7e166df1a05058c9a4a0f6683 Mon Sep 17 00:00:00 2001
From: Wojtek Kosior <wk@koszkonutek-tmp.pl.eu.org>
Date: Fri, 30 Apr 2021 00:33:56 +0200
Subject: initial/final commit

---
 openssl-1.1.0h/crypto/ec/ec_check.c | 72 +++++++++++++++++++++++++++++++++++++
 1 file changed, 72 insertions(+)
 create mode 100644 openssl-1.1.0h/crypto/ec/ec_check.c

(limited to 'openssl-1.1.0h/crypto/ec/ec_check.c')

diff --git a/openssl-1.1.0h/crypto/ec/ec_check.c b/openssl-1.1.0h/crypto/ec/ec_check.c
new file mode 100644
index 0000000..eeb06ec
--- /dev/null
+++ b/openssl-1.1.0h/crypto/ec/ec_check.c
@@ -0,0 +1,72 @@
+/*
+ * Copyright 2002-2016 The OpenSSL Project Authors. All Rights Reserved.
+ *
+ * Licensed under the OpenSSL license (the "License").  You may not use
+ * this file except in compliance with the License.  You can obtain a copy
+ * in the file LICENSE in the source distribution or at
+ * https://www.openssl.org/source/license.html
+ */
+
+#include "ec_lcl.h"
+#include <openssl/err.h>
+
+int EC_GROUP_check(const EC_GROUP *group, BN_CTX *ctx)
+{
+    int ret = 0;
+    const BIGNUM *order;
+    BN_CTX *new_ctx = NULL;
+    EC_POINT *point = NULL;
+
+    /* Custom curves assumed to be correct */
+    if ((group->meth->flags & EC_FLAGS_CUSTOM_CURVE) != 0)
+        return 1;
+
+    if (ctx == NULL) {
+        ctx = new_ctx = BN_CTX_new();
+        if (ctx == NULL) {
+            ECerr(EC_F_EC_GROUP_CHECK, ERR_R_MALLOC_FAILURE);
+            goto err;
+        }
+    }
+
+    /* check the discriminant */
+    if (!EC_GROUP_check_discriminant(group, ctx)) {
+        ECerr(EC_F_EC_GROUP_CHECK, EC_R_DISCRIMINANT_IS_ZERO);
+        goto err;
+    }
+
+    /* check the generator */
+    if (group->generator == NULL) {
+        ECerr(EC_F_EC_GROUP_CHECK, EC_R_UNDEFINED_GENERATOR);
+        goto err;
+    }
+    if (EC_POINT_is_on_curve(group, group->generator, ctx) <= 0) {
+        ECerr(EC_F_EC_GROUP_CHECK, EC_R_POINT_IS_NOT_ON_CURVE);
+        goto err;
+    }
+
+    /* check the order of the generator */
+    if ((point = EC_POINT_new(group)) == NULL)
+        goto err;
+    order = EC_GROUP_get0_order(group);
+    if (order == NULL)
+        goto err;
+    if (BN_is_zero(order)) {
+        ECerr(EC_F_EC_GROUP_CHECK, EC_R_UNDEFINED_ORDER);
+        goto err;
+    }
+
+    if (!EC_POINT_mul(group, point, order, NULL, NULL, ctx))
+        goto err;
+    if (!EC_POINT_is_at_infinity(group, point)) {
+        ECerr(EC_F_EC_GROUP_CHECK, EC_R_INVALID_GROUP_ORDER);
+        goto err;
+    }
+
+    ret = 1;
+
+ err:
+    BN_CTX_free(new_ctx);
+    EC_POINT_free(point);
+    return ret;
+}
-- 
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