Save an internal EC key string (public or private) to an unencrypted key file.
public static int SaveKey( string outputFile, string internalKey, Ecc.KeyType keyType = Ecc.KeyType.Default, Ecc.Format fileFormat = Ecc.Format.Default )
Public Shared Function SaveKey ( outputFile As String, internalKey As String, Optional keyType As Ecc.KeyType = Ecc.KeyType.Default, Optional fileFormat As Ecc.Format = Ecc.Format.Default ) As Integer
VB6/C equivalent: ECC_SaveKey