diff --git a/src/libraries/Common/src/System/Security/Cryptography/ECCng.ImportExport.cs b/src/libraries/Common/src/System/Security/Cryptography/ECCng.ImportExport.cs
index 8e8726fb3cd2c0..dcd36ca435cdc0 100644
--- a/src/libraries/Common/src/System/Security/Cryptography/ECCng.ImportExport.cs
+++ b/src/libraries/Common/src/System/Security/Cryptography/ECCng.ImportExport.cs
@@ -384,7 +384,7 @@ private static bool IsMagicValueOfKeyPublic(KeyBlobMagicNumber magic)
         /// that don't have the named curve functionality.
         /// </summary>
         private static KeyBlobMagicNumber EcdsaCurveNameToMagicNumber(string? name, bool includePrivateParameters) =>
-            EcdsaCurveNameToAlgorithm(name) switch
+            CngKey.EcdsaCurveNameToAlgorithm(name).Algorithm switch
             {
                 AlgorithmName.ECDsaP256 => includePrivateParameters ?
                        KeyBlobMagicNumber.BCRYPT_ECDSA_PRIVATE_P256_MAGIC :
@@ -409,7 +409,7 @@ private static KeyBlobMagicNumber EcdsaCurveNameToMagicNumber(string? name, bool
         /// that don't have the named curve functionality.
         /// </summary>
         private static KeyBlobMagicNumber EcdhCurveNameToMagicNumber(string? name, bool includePrivateParameters) =>
-            EcdhCurveNameToAlgorithm(name) switch
+            CngKey.EcdhCurveNameToAlgorithm(name).Algorithm switch
             {
                 AlgorithmName.ECDHP256 => includePrivateParameters ?
                        KeyBlobMagicNumber.BCRYPT_ECDH_PRIVATE_P256_MAGIC :
@@ -513,58 +513,5 @@ ref MemoryMarshal.GetReference(keyBlob),
 
             return keyHandle;
         }
-
-        /// <summary>
-        /// Map a curve name to algorithm. This enables curves that worked pre-Win10
-        /// to work with newer APIs for import and export.
-        /// </summary>
-        internal static string EcdsaCurveNameToAlgorithm(string? algorithm)
-        {
-            switch (algorithm)
-            {
-                case "nistP256":
-                case "ECDSA_P256":
-                    return AlgorithmName.ECDsaP256;
-
-                case "nistP384":
-                case "ECDSA_P384":
-                    return AlgorithmName.ECDsaP384;
-
-                case "nistP521":
-                case "ECDSA_P521":
-                    return AlgorithmName.ECDsaP521;
-            }
-
-            // All other curves are new in Win10 so use generic algorithm
-            return AlgorithmName.ECDsa;
-        }
-
-        /// <summary>
-        /// Map a curve name to algorithm. This enables curves that worked pre-Win10
-        /// to work with newer APIs for import and export.
-        /// </summary>
-        internal static string EcdhCurveNameToAlgorithm(string? algorithm)
-        {
-            switch (algorithm)
-            {
-                case "nistP256":
-                case "ECDH_P256":
-                case "ECDSA_P256":
-                    return AlgorithmName.ECDHP256;
-
-                case "nistP384":
-                case "ECDH_P384":
-                case "ECDSA_P384":
-                    return AlgorithmName.ECDHP384;
-
-                case "nistP521":
-                case "ECDH_P521":
-                case "ECDSA_P521":
-                    return AlgorithmName.ECDHP521;
-            }
-
-            // All other curves are new in Win10 so use generic algorithm
-            return AlgorithmName.ECDH;
-        }
     }
 }
diff --git a/src/libraries/Common/tests/System/Security/Cryptography/AlgorithmImplementations/EC/EccTestBase.cs b/src/libraries/Common/tests/System/Security/Cryptography/AlgorithmImplementations/EC/EccTestBase.cs
index 2f347469e12cb9..5f9dae4c8fcefb 100644
--- a/src/libraries/Common/tests/System/Security/Cryptography/AlgorithmImplementations/EC/EccTestBase.cs
+++ b/src/libraries/Common/tests/System/Security/Cryptography/AlgorithmImplementations/EC/EccTestBase.cs
@@ -249,6 +249,18 @@ internal static void CompareCurve(in ECCurve c1, in ECCurve c2)
                 }
             }
         }
+
+        internal static string InvertStringCase(string str)
+        {
+            return string.Create(str.Length, str, static (destination, str) =>
+            {
+                for (int i = 0; i < str.Length; i++)
+                {
+                    char c = str[i];
+                    destination[i] = char.IsAsciiLetter(c) ? (char)(c ^ 0b0100000) : c;
+                }
+            });
+        }
 #endif
     }
 }
diff --git a/src/libraries/Common/tests/System/Security/Cryptography/AlgorithmImplementations/ECDiffieHellman/ECDiffieHellmanTests.ImportExport.cs b/src/libraries/Common/tests/System/Security/Cryptography/AlgorithmImplementations/ECDiffieHellman/ECDiffieHellmanTests.ImportExport.cs
index 0c06a3f12f1516..82f78094bb1000 100644
--- a/src/libraries/Common/tests/System/Security/Cryptography/AlgorithmImplementations/ECDiffieHellman/ECDiffieHellmanTests.ImportExport.cs
+++ b/src/libraries/Common/tests/System/Security/Cryptography/AlgorithmImplementations/ECDiffieHellman/ECDiffieHellmanTests.ImportExport.cs
@@ -1,6 +1,7 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 
+using System.Collections.Generic;
 using System.Security.Cryptography.Tests;
 using Test.Cryptography;
 using Xunit;
@@ -14,7 +15,7 @@ public partial class ECDiffieHellmanTests
         // probe for this capability before depending on it.
         internal static bool ECDsa224Available =>
             ECDiffieHellmanFactory.IsCurveValid(new Oid(ECDSA_P224_OID_VALUE));
-        
+
         internal static bool CanDeriveNewPublicKey { get; }
             = EcDiffieHellman.Tests.ECDiffieHellmanFactory.CanDeriveNewPublicKey;
 
@@ -416,6 +417,50 @@ public static void ImportFromPrivateOnlyKey()
             }
         }
 
+        [Theory]
+        [MemberData(nameof(NamedCurves))]
+        public static void OidPresentOnCurveMiscased(ECCurve curve)
+        {
+            ECCurve miscasedCurve = ECCurve.CreateFromFriendlyName(InvertStringCase(curve.Oid.FriendlyName));
+            Assert.NotEqual(miscasedCurve.Oid.FriendlyName, curve.Oid.FriendlyName);
+            Assert.Equal(miscasedCurve.Oid.FriendlyName, curve.Oid.FriendlyName, ignoreCase: true);
+
+            using (ECDiffieHellman ecdh = ECDiffieHellmanFactory.Create())
+            {
+                ecdh.GenerateKey(miscasedCurve);
+                ECParameters exportedParameters = ecdh.ExportParameters(false);
+                Assert.Equal(curve.Oid.Value, exportedParameters.Curve.Oid.Value);
+
+                exportedParameters.Curve = miscasedCurve;
+
+                // Assert.NoThrow. Make sure we can import the mis-cased curve.
+                ecdh.ImportParameters(exportedParameters);
+            }
+        }
+
+        public static IEnumerable<object[]> NamedCurves
+        {
+            get
+            {
+                yield return new object[] { ECCurve.NamedCurves.nistP256 };
+                yield return new object[] { ECCurve.NamedCurves.nistP384 };
+                yield return new object[] { ECCurve.NamedCurves.nistP521 };
+                yield return new object[] { ECCurve.CreateFromFriendlyName("ECDH_P256") };
+                yield return new object[] { ECCurve.CreateFromFriendlyName("ECDH_P384") };
+                yield return new object[] { ECCurve.CreateFromFriendlyName("ECDH_P521") };
+
+                if (ECDiffieHellmanFactory.IsCurveValid(ECCurve.NamedCurves.brainpoolP160r1.Oid))
+                {
+                    yield return new object[] { ECCurve.NamedCurves.brainpoolP160r1 };
+                }
+
+                if (ECDiffieHellmanFactory.IsCurveValid(ECCurve.NamedCurves.brainpoolP160t1.Oid))
+                {
+                    yield return new object[] { ECCurve.NamedCurves.brainpoolP160t1 };
+                }
+            }
+        }
+
         private static void VerifyNamedCurve(ECParameters parameters, ECDiffieHellman ec, int keySize, bool includePrivate)
         {
             parameters.Validate();
diff --git a/src/libraries/Common/tests/System/Security/Cryptography/AlgorithmImplementations/ECDsa/ECDsaImportExport.cs b/src/libraries/Common/tests/System/Security/Cryptography/AlgorithmImplementations/ECDsa/ECDsaImportExport.cs
index bff75c20922933..1925320e66ab5a 100644
--- a/src/libraries/Common/tests/System/Security/Cryptography/AlgorithmImplementations/ECDsa/ECDsaImportExport.cs
+++ b/src/libraries/Common/tests/System/Security/Cryptography/AlgorithmImplementations/ECDsa/ECDsaImportExport.cs
@@ -1,10 +1,11 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 
-using Xunit;
+using System.Collections.Generic;
 using System.Security.Cryptography.Tests;
-using Test.Cryptography;
 using System.Security.Cryptography.EcDiffieHellman.Tests;
+using Test.Cryptography;
+using Xunit;
 
 namespace System.Security.Cryptography.EcDsa.Tests
 {
@@ -353,6 +354,50 @@ public static void ImportFromPrivateOnlyKey()
             }
         }
 
+        [Theory]
+        [MemberData(nameof(NamedCurves))]
+        public static void OidPresentOnCurveMiscased(ECCurve curve)
+        {
+            ECCurve miscasedCurve = ECCurve.CreateFromFriendlyName(InvertStringCase(curve.Oid.FriendlyName));
+            Assert.NotEqual(miscasedCurve.Oid.FriendlyName, curve.Oid.FriendlyName);
+            Assert.Equal(miscasedCurve.Oid.FriendlyName, curve.Oid.FriendlyName, ignoreCase: true);
+
+            using (ECDsa ecdsa = ECDsaFactory.Create())
+            {
+                ecdsa.GenerateKey(miscasedCurve);
+                ECParameters exportedParameters = ecdsa.ExportParameters(false);
+                Assert.Equal(curve.Oid.Value, exportedParameters.Curve.Oid.Value);
+
+                exportedParameters.Curve = miscasedCurve;
+
+                // Assert.NoThrow. Make sure we can import the mis-cased curve.
+                ecdsa.ImportParameters(exportedParameters);
+            }
+        }
+
+        public static IEnumerable<object[]> NamedCurves
+        {
+            get
+            {
+                yield return new object[] { ECCurve.NamedCurves.nistP256 };
+                yield return new object[] { ECCurve.NamedCurves.nistP384 };
+                yield return new object[] { ECCurve.NamedCurves.nistP521 };
+                yield return new object[] { ECCurve.CreateFromFriendlyName("ECDSA_P256") };
+                yield return new object[] { ECCurve.CreateFromFriendlyName("ECDSA_P384") };
+                yield return new object[] { ECCurve.CreateFromFriendlyName("ECDSA_P521") };
+
+                if (ECDsaFactory.IsCurveValid(ECCurve.NamedCurves.brainpoolP160r1.Oid))
+                {
+                    yield return new object[] { ECCurve.NamedCurves.brainpoolP160r1 };
+                }
+
+                if (ECDsaFactory.IsCurveValid(ECCurve.NamedCurves.brainpoolP160t1.Oid))
+                {
+                    yield return new object[] { ECCurve.NamedCurves.brainpoolP160t1 };
+                }
+            }
+        }
+
         private static void VerifyNamedCurve(ECParameters parameters, ECDsa ec, int keySize, bool includePrivate)
         {
             parameters.Validate();
diff --git a/src/libraries/System.Security.Cryptography/src/System/Security/Cryptography/CngKey.EC.cs b/src/libraries/System.Security.Cryptography/src/System/Security/Cryptography/CngKey.EC.cs
index c47f427b4cf1d6..045de45192b06c 100644
--- a/src/libraries/System.Security.Cryptography/src/System/Security/Cryptography/CngKey.EC.cs
+++ b/src/libraries/System.Security.Cryptography/src/System/Security/Cryptography/CngKey.EC.cs
@@ -26,8 +26,9 @@ internal static bool IsECNamedCurve(string algorithm)
         {
             if (IsECNamedCurve())
             {
-                oidValue = null;
-                return _keyHandle.GetPropertyAsString(KeyPropertyName.ECCCurveName, CngPropertyOptions.None);
+                string? curveName = _keyHandle.GetPropertyAsString(KeyPropertyName.ECCCurveName, CngPropertyOptions.None);
+                oidValue = curveName is null ? null : OidLookup.ToOid(curveName, OidGroup.PublicKeyAlgorithm, fallBackToAllGroups: false);
+                return curveName;
             }
 
             // Use hard-coded values (for use with pre-Win10 APIs)
@@ -81,53 +82,52 @@ internal static CngProperty GetPropertyFromNamedCurve(ECCurve curve)
         /// Map a curve name to algorithm. This enables curves that worked pre-Win10
         /// to work with newer APIs for import and export.
         /// </summary>
-        internal static CngAlgorithm EcdsaCurveNameToAlgorithm(string name)
+        internal static CngAlgorithm EcdsaCurveNameToAlgorithm(ReadOnlySpan<char> name)
         {
-            switch (name)
-            {
-                case "nistP256":
-                case "ECDSA_P256":
-                    return CngAlgorithm.ECDsaP256;
-
-                case "nistP384":
-                case "ECDSA_P384":
-                    return CngAlgorithm.ECDsaP384;
+            const int MaxCurveNameLength = 16;
+            Span<char> nameLower = stackalloc char[MaxCurveNameLength];
+            int written = name.ToLowerInvariant(nameLower);
 
-                case "nistP521":
-                case "ECDSA_P521":
-                    return CngAlgorithm.ECDsaP521;
+            // Either it is empty or too big for the buffer, and the buffer is large enough to hold all mapped
+            // curve names, so return the generic algorithm.
+            if (written < 1)
+            {
+                return CngAlgorithm.ECDsa;
             }
 
-            // All other curves are new in Win10 so use generic algorithm
-            return CngAlgorithm.ECDsa;
+            return nameLower.Slice(0, written) switch
+            {
+                "nistp256" or "ecdsa_p256" => CngAlgorithm.ECDsaP256,
+                "nistp384" or "ecdsa_p384" => CngAlgorithm.ECDsaP384,
+                "nistp521" or "ecdsa_p521" => CngAlgorithm.ECDsaP521,
+                _ => CngAlgorithm.ECDsa, // All other curves are new in Win10 so use generic algorithm
+            };
         }
 
         /// <summary>
         /// Map a curve name to algorithm. This enables curves that worked pre-Win10
         /// to work with newer APIs for import and export.
         /// </summary>
-        internal static CngAlgorithm EcdhCurveNameToAlgorithm(string name)
+        internal static CngAlgorithm EcdhCurveNameToAlgorithm(ReadOnlySpan<char> name)
         {
-            switch (name)
+            const int MaxCurveNameLength = 16;
+            Span<char> nameLower = stackalloc char[MaxCurveNameLength];
+            int written = name.ToLowerInvariant(nameLower);
+
+            // Either it is empty or too big for the buffer, and the buffer is large enough to hold all mapped
+            // curve names, so return the generic algorithm.
+            if (written < 1)
             {
-                case "nistP256":
-                case "ECDH_P256":
-                case "ECDSA_P256":
-                    return CngAlgorithm.ECDiffieHellmanP256;
-
-                case "nistP384":
-                case "ECDH_P384":
-                case "ECDSA_P384":
-                    return CngAlgorithm.ECDiffieHellmanP384;
-
-                case "nistP521":
-                case "ECDH_P521":
-                case "ECDSA_P521":
-                    return CngAlgorithm.ECDiffieHellmanP521;
+                return CngAlgorithm.ECDiffieHellman;
             }
 
-            // All other curves are new in Win10 so use generic algorithm
-            return CngAlgorithm.ECDiffieHellman;
+            return nameLower.Slice(0, written) switch
+            {
+                "nistp256" or "ecdsa_p256" or "ecdh_p256" => CngAlgorithm.ECDiffieHellmanP256,
+                "nistp384" or "ecdsa_p384" or "ecdh_p384" => CngAlgorithm.ECDiffieHellmanP384,
+                "nistp521" or "ecdsa_p521" or "ecdh_p521" => CngAlgorithm.ECDiffieHellmanP521,
+                _ => CngAlgorithm.ECDiffieHellman, // All other curves are new in Win10 so use generic algorithm
+            };
         }
 
         internal static CngKey Create(ECCurve curve, Func<string?, CngAlgorithm> algorithmResolver)
diff --git a/src/libraries/System.Security.Cryptography/src/System/Security/Cryptography/Helpers.cs b/src/libraries/System.Security.Cryptography/src/System/Security/Cryptography/Helpers.cs
index f2a4addbca6a5d..4f216e07170a98 100644
--- a/src/libraries/System.Security.Cryptography/src/System/Security/Cryptography/Helpers.cs
+++ b/src/libraries/System.Security.Cryptography/src/System/Security/Cryptography/Helpers.cs
@@ -204,7 +204,8 @@ internal static bool AreSamePublicECParameters(ECParameters aParameters, ECParam
             if (aCurve.IsNamed)
             {
                 // On Windows we care about FriendlyName, on Unix we care about Value
-                return (aCurve.Oid.Value == bCurve.Oid.Value && aCurve.Oid.FriendlyName == bCurve.Oid.FriendlyName);
+                return aCurve.Oid.Value == bCurve.Oid.Value &&
+                    string.Equals(aCurve.Oid.FriendlyName, bCurve.Oid.FriendlyName, StringComparison.OrdinalIgnoreCase);
             }
 
             if (!aCurve.IsExplicit)
diff --git a/src/libraries/System.Security.Cryptography/src/System/Security/Cryptography/OidLookup.cs b/src/libraries/System.Security.Cryptography/src/System/Security/Cryptography/OidLookup.cs
index 80134ead051d4d..18e9dc392070d4 100644
--- a/src/libraries/System.Security.Cryptography/src/System/Security/Cryptography/OidLookup.cs
+++ b/src/libraries/System.Security.Cryptography/src/System/Security/Cryptography/OidLookup.cs
@@ -96,7 +96,7 @@ internal static partial class OidLookup
         }
 
         /// <summary>Expected size of <see cref="s_friendlyNameToOid"/>.</summary>
-        private const int FriendlyNameToOidCount = 111;
+        private const int FriendlyNameToOidCount = 114;
 
         /// <summary>Expected size of <see cref="s_oidToFriendlyName"/>.</summary>
         private const int OidToFriendlyNameCount = 103;
@@ -206,9 +206,9 @@ static void AddEntry(string oid, string primaryFriendlyName, string[]? additiona
             AddEntry("1.3.133.16.840.63.0.2", "ECDH_STD_SHA1_KDF");
             AddEntry("1.3.132.1.11.1", "ECDH_STD_SHA256_KDF");
             AddEntry("1.3.132.1.11.2", "ECDH_STD_SHA384_KDF");
-            AddEntry("1.2.840.10045.3.1.7", "ECDSA_P256", new[] { "nistP256", "secP256r1", "x962P256v1" } );
-            AddEntry("1.3.132.0.34", "ECDSA_P384", new[] { "nistP384", "secP384r1" });
-            AddEntry("1.3.132.0.35", "ECDSA_P521", new[] { "nistP521", "secP521r1" });
+            AddEntry("1.2.840.10045.3.1.7", "ECDSA_P256", new[] { "nistP256", "secP256r1", "x962P256v1", "ECDH_P256" } );
+            AddEntry("1.3.132.0.34", "ECDSA_P384", new[] { "nistP384", "secP384r1", "ECDH_P384" });
+            AddEntry("1.3.132.0.35", "ECDSA_P521", new[] { "nistP521", "secP521r1", "ECDH_P521" });
             AddEntry("1.2.840.113549.1.9.16.3.5", "ESDH");
             AddEntry("2.5.4.42", "G");
             AddEntry("2.5.4.43", "I");
diff --git a/src/libraries/System.Security.Cryptography/tests/X509Certificates/CertificateCreation/CertificateRequestUsageTests.cs b/src/libraries/System.Security.Cryptography/tests/X509Certificates/CertificateCreation/CertificateRequestUsageTests.cs
index 9eb846a2ccb90b..e65a0445b09b28 100644
--- a/src/libraries/System.Security.Cryptography/tests/X509Certificates/CertificateCreation/CertificateRequestUsageTests.cs
+++ b/src/libraries/System.Security.Cryptography/tests/X509Certificates/CertificateCreation/CertificateRequestUsageTests.cs
@@ -1094,6 +1094,31 @@ public static void CreateSigningRequestWithDuplicateAttributes(bool reversed)
             Assert.Equal(ExpectedPem, output);
         }
 
+        [Theory]
+        [InlineData("NISTP256", "SHA256")]
+        [InlineData("NISTP384", "SHA384")]
+        [InlineData("NISTP521", "SHA512")]
+        [InlineData("EcDsA_p256", "SHA256")]
+        [InlineData("EcDsA_p384", "SHA384")]
+        [InlineData("EcDsA_p521", "SHA512")]
+        public static void CreateSelfSigned_CurveNameIsCaseInsensitive(string curveName, string hashName)
+        {
+            ECCurve ecCurve = ECCurve.CreateFromFriendlyName(curveName);
+
+            using (ECDsa ecdsa = ECDsa.Create(ecCurve))
+            {
+                CertificateRequest request = new("CN=blah", ecdsa, new HashAlgorithmName(hashName));
+                DateTimeOffset notBefore = DateTimeOffset.UtcNow;
+                DateTimeOffset notAfter = notBefore.AddDays(30);
+
+                using (X509Certificate2 selfSignedCert = request.CreateSelfSigned(notBefore, notAfter))
+                using (ECDsa publicKey = selfSignedCert.GetECDsaPublicKey())
+                {
+                    Assert.NotNull(publicKey);
+                }
+            }
+        }
+
         private class InvalidSignatureGenerator : X509SignatureGenerator
         {
             private readonly byte[] _signatureAlgBytes;