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Attempt to load X.509 keys as ECDH keys first #115249

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Merged
merged 2 commits into from
May 3, 2025
Merged

Attempt to load X.509 keys as ECDH keys first #115249

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ca3fc19
Attempt to load X.509 keys as ECDH keys first.
vcsjones May 2, 2025
3a398df
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vcsjones May 2, 2025
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24 changes: 12 additions & 12 deletions ...curity.Cryptography/src/System/Security/Cryptography/X509Certificates/X509Certificate2.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -1172,18 +1172,18 @@ public static X509Certificate2 CreateFromPem(ReadOnlySpan<char> certPem, ReadOnl
s_DsaPublicKeyPrivateKeyLabels,
static keyPem => CreateAndImport(keyPem, DSA.Create),
certificate.CopyWithPrivateKey),
Oids.EcPublicKey when IsECDsa(certificate) =>
ExtractKeyFromPem<ECDsa>(
keyPem,
s_EcPublicKeyPrivateKeyLabels,
static keyPem => CreateAndImport(keyPem, ECDsa.Create),
certificate.CopyWithPrivateKey),
Oids.EcPublicKey when IsECDiffieHellman(certificate) =>
ExtractKeyFromPem<ECDiffieHellman>(
keyPem,
s_EcPublicKeyPrivateKeyLabels,
static keyPem => CreateAndImport(keyPem, ECDiffieHellman.Create),
certificate.CopyWithPrivateKey),
Oids.EcPublicKey when IsECDsa(certificate) =>
ExtractKeyFromPem<ECDsa>(
keyPem,
s_EcPublicKeyPrivateKeyLabels,
static keyPem => CreateAndImport(keyPem, ECDsa.Create),
certificate.CopyWithPrivateKey),
Oids.MlKem512 or Oids.MlKem768 or Oids.MlKem1024 =>
ExtractKeyFromPem<MLKem>(
keyPem,
Expand Down Expand Up @@ -1259,18 +1259,18 @@ public static X509Certificate2 CreateFromEncryptedPem(ReadOnlySpan<char> certPem
password,
static (keyPem, password) => CreateAndImportEncrypted(keyPem, password, DSA.Create),
certificate.CopyWithPrivateKey),
Oids.EcPublicKey when IsECDsa(certificate) =>
ExtractKeyFromEncryptedPem<ECDsa>(
keyPem,
password,
static (keyPem, password) => CreateAndImportEncrypted(keyPem, password, ECDsa.Create),
certificate.CopyWithPrivateKey),
Oids.EcPublicKey when IsECDiffieHellman(certificate) =>
ExtractKeyFromEncryptedPem<ECDiffieHellman>(
keyPem,
password,
static (keyPem, password) => CreateAndImportEncrypted(keyPem, password, ECDiffieHellman.Create),
certificate.CopyWithPrivateKey),
Oids.EcPublicKey when IsECDsa(certificate) =>
ExtractKeyFromEncryptedPem<ECDsa>(
keyPem,
password,
static (keyPem, password) => CreateAndImportEncrypted(keyPem, password, ECDsa.Create),
certificate.CopyWithPrivateKey),
Oids.MlKem512 or Oids.MlKem768 or Oids.MlKem1024 =>
ExtractKeyFromEncryptedPem<MLKem>(
keyPem,
Expand Down
50 changes: 50 additions & 0 deletions ...libraries/System.Security.Cryptography/tests/X509Certificates/X509Certificate2PemTests.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -268,6 +268,56 @@ public static void CreateFromPem_ECDH_Pkcs8_Success()
}
}

[Fact]
public static void CreateFromPem_EC_Pkcs8_Success()
{
// ecPublicKey certificates that have no key usage restrictions should be allowed to be used as both
// an ECDsa key and an ECDiffieHellman key.

// For purposes of creating the certificate, it doesn't matter if we use an ECDSA or ECDH key, but starting
// with ECDSA means we can make a self-signed cert.
using ECDsa key = ECDsa.Create();
key.ImportFromPem(TestData.EcDhPkcs8Key);
CertificateRequest req = new("CN=radish", key, HashAlgorithmName.SHA256);
using X509Certificate2 cert = req.CreateSelfSigned(DateTimeOffset.Now, DateTimeOffset.Now.AddYears(1));
using X509Certificate2 pubOnly = X509CertificateLoader.LoadCertificate(cert.RawDataMemory.Span);
string pemAggregate = $"{pubOnly.ExportCertificatePem()}\n{TestData.EcDhPkcs8Key}";
using X509Certificate2 reLoaded = X509Certificate2.CreateFromPem(pemAggregate, pemAggregate);

AssertKeysMatch(TestData.EcDhPkcs8Key, reLoaded.GetECDiffieHellmanPrivateKey);
AssertKeysMatch(TestData.EcDhPkcs8Key, reLoaded.GetECDsaPrivateKey);
AssertExtensions.SequenceEqual(cert.SerialNumberBytes.Span, reLoaded.SerialNumberBytes.Span);
}

[Fact]
public static void CreateFromEncryptedPem_EC_Pkcs8_Success()
{
// ecPublicKey certificates that have no key usage restrictions should be allowed to be used as both
// an ECDsa key and an ECDiffieHellman key.

// For purposes of creating the certificate, it doesn't matter if we use an ECDSA or ECDH key, but starting
// with ECDSA means we can make a self-signed cert.
using ECDsa key = ECDsa.Create();
key.ImportFromPem(TestData.EcDhPkcs8Key);
CertificateRequest req = new("CN=radish", key, HashAlgorithmName.SHA256);
using X509Certificate2 cert = req.CreateSelfSigned(DateTimeOffset.Now, DateTimeOffset.Now.AddYears(1));
using X509Certificate2 pubOnly = X509CertificateLoader.LoadCertificate(cert.RawDataMemory.Span);

PbeParameters pbe = new(PbeEncryptionAlgorithm.Aes128Cbc, HashAlgorithmName.SHA1, 32);
const string Password = "PLACEHOLDER";

string encryptedPrivateKey = PemEncoding.WriteString(
"ENCRYPTED PRIVATE KEY",
key.ExportEncryptedPkcs8PrivateKey(Password, pbe));

string pemAggregate = $"{pubOnly.ExportCertificatePem()}\n{encryptedPrivateKey}";
using X509Certificate2 reLoaded = X509Certificate2.CreateFromEncryptedPem(pemAggregate, pemAggregate, Password);

AssertKeysMatch(encryptedPrivateKey, reLoaded.GetECDiffieHellmanPrivateKey, Password);
AssertKeysMatch(encryptedPrivateKey, reLoaded.GetECDsaPrivateKey, Password);
AssertExtensions.SequenceEqual(cert.SerialNumberBytes.Span, reLoaded.SerialNumberBytes.Span);
}

[ConditionalFact(typeof(MLKem), nameof(MLKem.IsSupported))]
public static void CreateFromPem_MLKem_Pkcs8_Success()
{
Expand Down
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