I found

But I Don't understand what is going on...

The same code is working find If I call it from the terminal

But If I'm debug the code from Visual Studio Code the decrypt is allways returning me empty string.

Do you see what is going on ???

I use the same key for both operation, my bad, but even using the private and the public key don't get me to the goal

ClassMethod UnitTest()

{

  set inputPlainText = "David"

  set privKeyFileName = "C:\temp\toto.pem"

  set pubKeyFileName = "C:\temp\toto_pub.pem"

  // Lire la clé privée depuis le fichier

  set privobjCharFile = ##class(%Stream.FileCharacter).%New()

  set privobjCharFile.Filename = privKeyFileName

  set privKey = privobjCharFile.Read()

  // Lire la clé publique depuis le fichier

  set pubobjCharFile = ##class(%Stream.FileCharacter).%New()

  set pubobjCharFile.Filename = pubKeyFileName

  set pubKey = pubobjCharFile.Read()

  // Chiffrer le texte en utilisant RSA

  set encryptedText = $System.Encryption.RSAEncrypt(inputPlainText, privKey)

  // Déchiffrer le texte en utilisant RSA avec la clé publique

  set decryptedText = $System.Encryption.RSADecrypt(encryptedText, pubKey)

  // retour

  quit decryptedText

}

Bravo Muhammad very helpful, I need today to deep dive in docker, and you help me a lot