VBScript Requires Chilkat v11.0.0+

RSA Encrypt and Decrypt Credit Card Numbers

See more RSA Examples

_LANGUAGE_ sample code to RSA public-key encrypt and decrypt credit card numbers. The RSA key is loaded from an unencrypted PKCS8 file. Chilkat provides many ways of setting the key -- loading from both encrypted and unencrypted PEM, PKCS8, DER, PVK, etc. Keys may be loaded from files or in-memory representations. (The RSA component also provides the ability to generate RSA keys.) VBScript

Dim fso, outFile
Set fso = CreateObject("Scripting.FileSystemObject")
'Create a Unicode (utf-16) output text file.
Set outFile = fso.CreateTextFile("output.txt", True, True)

success = 0

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

set rsa = CreateObject("Chilkat.Rsa")

set privKey = CreateObject("Chilkat.PrivateKey")

'  Load an RSA private key from a file:
success = privKey.LoadAnyFormatFile("rsaPrivateKey.key","")
If (success = 0) Then
    outFile.WriteLine(privKey.LastErrorText)
    WScript.Quit
End If

'  Get the public part of the private key.
set pubKey = CreateObject("Chilkat.PublicKey")
success = privKey.ToPublicKey(pubKey)

success = rsa.UsePublicKey(pubKey)
If (success = 0) Then
    outFile.WriteLine(rsa.LastErrorText)
    WScript.Quit
End If

'  Encrypt a VISA credit card number:
'  1234-5678-0000-9999
ccNumber = "1234567800009999"

usePrivateKey = 0
rsa.EncodingMode = "base64"
encryptedStr = rsa.EncryptStringENC(ccNumber,usePrivateKey)
outFile.WriteLine("Encrypted:")
outFile.WriteLine(encryptedStr)

'  Now decrypt:
set rsaDecryptor = CreateObject("Chilkat.Rsa")

rsaDecryptor.EncodingMode = "base64"
success = rsaDecryptor.UsePrivateKey(privKey)

usePrivateKey = 1
decryptedStr = rsaDecryptor.DecryptStringENC(encryptedStr,usePrivateKey)

outFile.WriteLine("Decrypted:")
outFile.WriteLine(decryptedStr)

'  Important: RSA encryption should only be used to encrypt small amounts of data.
'  It is typically used for encrypting symmetric encryption
'  keys such that a symmetric encryption algorithm, such as 
'  AES is then used to encrypt/decrypt bulk data.

outFile.Close