public static bool TryWrite(CredentialInput credentialInput)
{
// unmanagedCodePermission.Demand();
if (string.IsNullOrEmpty(credentialInput.TargetName))
{
throw new InvalidOperationException("Target must be specified.");
}
if (credentialInput.Comment != null && credentialInput.Comment.Length > NativeMethods.CRED_MAX_STRING_LENGTH)
{
throw new ArgumentOutOfRangeException(
$"The comment has exceeded {NativeMethods.CRED_MAX_STRING_LENGTH} characters.");
}
if (credentialInput.UserName.Length > NativeMethods.CRED_MAX_USERNAME_LENGTH)
{
throw new ArgumentOutOfRangeException(
$"The UserName has exceeded {NativeMethods.CRED_MAX_USERNAME_LENGTH} characters.");
}
byte[] bytes = Encoding.Unicode.GetBytes(credentialInput.Password);
if (bytes.Length > NativeMethods.CRED_MAX_CREDENTIAL_BLOB_SIZE)
{
throw new ArgumentOutOfRangeException(
$"The password has exceeded {NativeMethods.CRED_MAX_CREDENTIAL_BLOB_SIZE} bytes.");
}
NativeMethods.CREDENTIAL parameters;
IntPtr credentialBlob = IntPtr.Zero;
try
{
parameters = new NativeMethods.CREDENTIAL
{
Flags = credentialInput.Flags,
Type = (int)credentialInput.CredentialType,
TargetName = credentialInput.TargetName,
Comment = credentialInput.Comment,
// LastWritten = // dont' work on write.
CredentialBlobSize = bytes.Length,
CredentialBlob = Marshal.StringToCoTaskMemUni(credentialInput.Password),
Persist = (int)credentialInput.PersistanceType,
//AttributeCount = 0, // attributes is not used.
// TargetAlias is not used.
UserName = credentialInput.UserName,
};
credentialBlob = parameters.CredentialBlob;
if (!NativeMethods.CredWrite(ref parameters, 0U))
{
return(false);
}
}
finally
{
Marshal.FreeCoTaskMem(credentialBlob);
}
return(true);
}
static CredentialOutput LoadInternal(NativeMethods.CREDENTIAL credential, string targetName)
=> new CredentialOutput(
credentialType: (CredentialType)credential.Type,
targetName: targetName,
comment: credential.Comment,
DateTime.FromFileTimeUtc(credential.LastWritten),
credential.CredentialBlobSize > 0
? Marshal.PtrToStringUni(credential.CredentialBlob, credential.CredentialBlobSize / 2)
: null,
(PersistanceType)credential.Persist,
credential.UserName
);
internal static extern bool CredWrite([In] ref NativeMethods.CREDENTIAL userCredential, [In] uint flags);
