(VB.NET) RSA Encrypt and OpenSSL Decrypt

Demonstrates how to use Chilkat to RSA encrypt, and then use OpenSSL to decrypt.

Chilkat .NET Downloads Chilkat .NET Framework Chilkat for .NET Core

'  This requires the Chilkat API to have been previously unlocked.
'  See Global Unlock Sample for sample code.

Dim rsa As New Chilkat.Rsa

Dim success As Boolean = rsa.GenerateKey(2048)

Dim privKey As Chilkat.PrivateKey = rsa.ExportPrivateKeyObj()
success = privKey.SavePkcs8PemFile("qa_output/privKey.pem")


rsa.EncodingMode = "base64"
Dim plainText As String = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz01234567890"
Dim bUsePrivateKey As Boolean = False
Dim encryptedStr As String = rsa.EncryptStringENC(plainText,bUsePrivateKey)

Dim bd As New Chilkat.BinData
bd.AppendEncoded(encryptedStr,"base64")
success = bd.WriteFile("qa_output/enc.dat")

'  The OpenSSL command to decrypt is:
'  openssl pkeyutl -in enc.dat -inkey privKey.pem -keyform PEM -pkeyopt rsa_padding_mode:pkcs1 -decrypt

Debug.WriteLine("OK")