Xbase++ Requires Chilkat v11.0.0+

Demonstrate RSA Encrypt/Decrypt using BinData

See more RSA Examples

Demonstrates how to RSA encrypt and decrypt data contained in a Chilkat BinData object. Xbase++

LOCAL nSuccess
LOCAL oPubKey
LOCAL oRsa
LOCAL oBd
LOCAL i
LOCAL oPrivKey
LOCAL cPassword

nSuccess := 0

//  The RSA public key is used for encryption, and the private key for decryption.

//  The public key's role is to make encryption accessible to anyone while ensuring that
//  only the private key holder can decrypt the messages.
//  The public key is designed to be widely distributed so anyone can use it to encrypt messages
//  intended for the owner of the private key.

//  Load our 2048-bit RSA public key.
oPubKey := CreateObject("Chilkat.PublicKey")
//  In all Chilkat methods expecting a path, you pass either absolute or relative paths.
nSuccess := oPubKey:LoadFromFile("rsaKeys/myTestRsaPublic.pem")
IF (nSuccess == 0)
    ? oPubKey:LastErrorText
    oPubKey:destroy()
    RETURN
ENDIF

oRsa := CreateObject("Chilkat.Rsa")

//  Tell RSA to use the public key.
oRsa:UsePublicKey(oPubKey)

//  RSA encryption is for small amounts of data, on the order of 200 bytes or less.
//  The maximum number of bytes that can be RSA encrypted depends
//  on the RSA key size and padding scheme (OAEP padding vs PKCS#1 v1.5 padding).
//  For specific limits, see: RSA Encryption Maximum Number of Bytes

//  Create some binary data to encrypt.
oBd := CreateObject("Chilkat.BinData")
i := 0
FOR i := 0 TO 49
    oBd:AppendByte(i)
NEXT

//  Show the bytes to be encrypted in hex format:
? "To be encrypted: " + oBd:GetEncoded("hex")

//  To be encrypted: 000102030405060708090A0B0C0D0E0F101112131415161718191A1B1C1D1E1F202122232425262728292A2B2C2D2E2F3031

//  RSA encrypt the contents of the bd, replacing the contents with the RSA encrypted data.
oRsa:EncryptBd(oBd, 0)

//  Now it is encrypted.
? "Encrypted size = " + Str(oBd:NumBytes)
? oBd:GetEncoded("hex")

//  Encrypted size = 256
//  749ED9D0A8767C06C09AD9697F654F86B145F966722F9714902C4175BDBD02E68984ECF111D4D461
//  EDB4A8E677D399D19CCA60F35C6DE9972F4262880FE9D77DB75915393E8E7DB80AAB5E383013FAEB
//  60C77D1E6FECC9A7C8426976416C6218FE7DA998EE063CE709E79C240F8625F4A56A0A33AFD63F7A
//  BA26F2A692B42E878C53B78602C725FE63FF961A46A2B9D436E5E3D9D64AE3F1D1F5AD5F5B47FCD69
//  447306B77F2FD6D766CCAA1A110A3371586B43DF0D7FFE2220D1B305CF9371AC342F849FB0C90CD99E
//  C176928D877FE1C0DE1A7CB6EB824FEC7E1DCF90EF2C6BA9F1DFD3EBFBE89C51AF074DC6AE02E544A78
//  5018C36D3D48B2EF5202AF61AC

//  ------------------------------------------------------------------------------------------------------------------------
//  Let's decrypt, which requires the matching private key...

//  Load the matching 2048-bit RSA private key.
oPrivKey := CreateObject("Chilkat.PrivateKey")
cPassword := "secret"
nSuccess := oPrivKey:LoadAnyFormatFile("rsaKeys/myTestRsaPrivate.pem", cPassword)
IF (nSuccess == 0)
    ? oPrivKey:LastErrorText
    oPubKey:destroy()
    oRsa:destroy()
    oBd:destroy()
    oPrivKey:destroy()
    RETURN
ENDIF

//  Tell the RSA object to use the private key.
oRsa:UsePrivateKey(oPrivKey)

//  Decrypt
nSuccess := oRsa:DecryptBd(oBd, 1)
IF (nSuccess == 0)
    ? oRsa:LastErrorText
    oPubKey:destroy()
    oRsa:destroy()
    oBd:destroy()
    oPrivKey:destroy()
    RETURN
ENDIF

//  Examine the contents of bd to see if it now contains the unencrypted original data.
? "Decrypted: " + oBd:GetEncoded("hex")

//  Decrypted: 000102030405060708090A0B0C0D0E0F101112131415161718191A1B1C1D1E1F202122232425262728292A2B2C2D2E2F3031

oPubKey:destroy()
oRsa:destroy()
oBd:destroy()
oPrivKey:destroy()