.Net 9 - X509CertificateLoader.LoadPkcs12 - private key throws error on certificate load

[JRosado-JRPI]

Description

The following method gets one exception when loading a pxf from a byte array , it wont throw any error to the app but i cant use the certificate to authenticate. if i use the old method (X509Certificate2) the pfx loads without issues.

the private key throws the message "Keyset does not exist"

Reproduction Steps

string pfxPass = "TESTEwebservice"

string pfxFileb64String = "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"

pfxFile = Convert.FromBase64String(pfxFileb64String);

var cert = X509CertificateLoader.LoadPkcs12(_pfxFile!, _pfxPass, X509KeyStorageFlags.MachineKeySet);

Expected behavior

The certificate loads with all the information on it including the private key:

=====================================================================

• PrivateKey {System.Security.Cryptography.RSACng} System.Security.Cryptography.AsymmetricAlgorithm {System.Security.Cryptography.RSACng}
• Key {System.Security.Cryptography.CngKey} System.Security.Cryptography.CngKey
• Algorithm {RSA} System.Security.Cryptography.CngAlgorithm
• AlgorithmGroup {RSA} System.Security.Cryptography.CngAlgorithmGroup ExportPolicy None System.Security.Cryptography.CngExportPolicies
• Handle {Microsoft.Win32.SafeHandles.SafeNCryptKeyHandle} Microsoft.Win32.SafeHandles.SafeNCryptKeyHandle IsEphemeral false bool IsMachineKey true bool KeyName "{B7F3C450-EBE1-4C34-94B8-D82A38159696}" string KeySize 4096 int KeyUsage AllUsages System.Security.Cryptography.CngKeyUsages ParentWindowHandle 0x0000000000000000 System.IntPtr
• Provider {Microsoft Enhanced Cryptographic Provider v1.0} System.Security.Cryptography.CngProvider
• ProviderHandle {Microsoft.Win32.SafeHandles.SafeNCryptProviderHandle} Microsoft.Win32.SafeHandles.SafeNCryptProviderHandle
• UIPolicy {System.Security.Cryptography.CngUIPolicy} System.Security.Cryptography.CngUIPolicy UniqueName "b43bd52ecbdd9a40eefa73532e6cdfd1_ee28a422-39d0-41ab-bd91-3a2ca36016f1" string
• Non-Public members
  KeyExchangeAlgorithm "RSA" string KeySize 4096 int KeySizeValue 4096 int
• LegalKeySizes {System.Security.Cryptography.KeySizes[1]} System.Security.Cryptography.KeySizes[] LegalKeySizesValue null System.Security.Cryptography.KeySizes[] SignatureAlgorithm "RSA" string
• Static members
• Non-Public members

=====================================================================

Actual behavior

If you inspect the cert var the private key have the following error

===================================================

• • PrivateKey 'cert.PrivateKey' threw an exception of type 'System.Security.Cryptography.CryptographicException' System.Security.Cryptography.AsymmetricAlgorithm {System.Security.Cryptography.CryptographicException}
• Data Count = 0 System.Collections.IDictionary {System.Collections.ListDictionaryInternal}
• Raw View
  HResult -2146893802 int HelpLink null string
• InnerException null System.Exception
• Static members
  Message "Keyset does not exist" string Source "System.Security.Cryptography" string StackTrace " at System.Security.Cryptography.CngKey.Open(String keyName, CngProvider provider, CngKeyOpenOptions openOptions)\r\n at System.Security.Cryptography.X509Certificates.CertificatePal.GetPrivateKey[T](Func2 createCsp, Func2 createCng)\r\n at System.Security.Cryptography.X509Certificates.X509Certificate2.get_PrivateKey()" string
• TargetSite {System.Security.Cryptography.CngKey Open(System.String, System.Security.Cryptography.CngProvider, System.Security.Cryptography.CngKeyOpenOptions)} System.Reflection.MethodBase {System.Reflection.RuntimeMethodInfo}
• Static members
• Non-Public members

=====================================================================

Regression?

IF i use the old methods, obsolete in .net 9, using the data provided above it works without issues:

string pfxPass = "TESTEwebservice"

string pfxFileb64String = "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"

pfxFile = Convert.FromBase64String(pfxFileb64String);

var cert = new X509Certificate2(_pfxFile!, _pfxPass, X509KeyStorageFlags.MachineKeySet);

Known Workarounds

Use the old method X509Certificate2, even it states that the method is obsolete

Configuration

.Net 9 Windows 11 Enterprise x64 Using Blazor Server, tested on Chrome

Other information

No response

[dotnet-policy-service[bot]]

Tagging subscribers to this area: @dotnet/area-system-security, @bartonjs, @vcsjones See info in area-owners.md if you want to be subscribed.