(PureBasic) RSA OAEP Padding

Demonstrates how to use OAEP padding with the RSA encryption algorithm. More information about OAEP Padding.

Note: This example requires Chilkat v11.0.0 or greater.

Chilkat PureBasic Module Download Chilkat PureBasic Module

IncludeFile "CkPublicKey.pb"
IncludeFile "CkRsa.pb"

Procedure ChilkatExample()

    success.i = 0

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

    rsa.i = CkRsa::ckCreate()
    If rsa.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    ; RSA public key in XML format:
    pubKeyXml.s = "<RSAPublicKey><Modulus>of3im3mRgd2NLXIGoK6uYLg6jj0Ug2b42rnqa5Tbwz2ieFqMJqt+++x2oqLYGurlz49nt+7/785g3XYWqoka4u9c9zul6YubIjnBM72dQy7rEkEfbUxgjcxqXyjZFx+FpaxFUecLu688XEu+9UA42VKiCgcl+E7TrqnfeeYpNXc=</Modulus><Exponent>AQAB</Exponent></RSAPublicKey>"

    pubKey.i = CkPublicKey::ckCreate()
    If pubKey.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    success = CkPublicKey::ckLoadFromString(pubKey,pubKeyXml)
    If success = 0
        Debug CkPublicKey::ckLastErrorText(pubKey)
        CkRsa::ckDispose(rsa)
        CkPublicKey::ckDispose(pubKey)
        ProcedureReturn
    EndIf

    success = CkRsa::ckUsePublicKey(rsa,pubKey)
    If success = 0
        Debug CkRsa::ckLastErrorText(rsa)
        CkRsa::ckDispose(rsa)
        CkPublicKey::ckDispose(pubKey)
        ProcedureReturn
    EndIf

    ; To use Optimal Asymmetric Encryption Padding (OAEP) padding,
    ; simply set the PkcsPadding property to 0
    CkRsa::setCkPkcsPadding(rsa, 0)

    ; Encrypt a string and return the encrypted data base64-encoded:
    CkRsa::setCkEncodingMode(rsa, "base64")

    plainText.s = "RSA Encryption should be easy."

    usePrivateKey.i = 0
    encryptedStr.s = CkRsa::ckEncryptStringENC(rsa,plainText,usePrivateKey)
    Debug encryptedStr


    CkRsa::ckDispose(rsa)
    CkPublicKey::ckDispose(pubKey)


    ProcedureReturn
EndProcedure