Hi @S-Soft ,
Please check the following document.
AsymmetricAlgorithm Class Inheritance Hierarchy
RSACryptoServiceProvider inherits the AsymmetricAlgorithm.
You can try the following code.
Dim MyCrypto As RSACryptoServiceProvider = CType(OriginalCertificate.PrivateKey, RSACryptoServiceProvider)
Best Regards.
Jiachen Li
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