(Visual FoxPro) Create PKCS1 RSA Signature with PEM Private Key

See more RSA Examples

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

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LOCAL lnSuccess
LOCAL loPkey
LOCAL loRsa
LOCAL lcStrData
LOCAL lcHexSig

lnSuccess = 0

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

loPkey = CreateObject('Chilkat.PrivateKey')

* Load the private key from an RSA PEM file:
lnSuccess = loPkey.LoadPemFile("pvkey2_rsa.pem")
IF (lnSuccess = 0) THEN
    ? loPkey.LastErrorText
    RELEASE loPkey
    CANCEL
ENDIF

loRsa = CreateObject('Chilkat.Rsa')

* Import the private key into the RSA object:
lnSuccess = loRsa.UsePrivateKey(loPkey)
IF (lnSuccess = 0) THEN
    ? loRsa.LastErrorText
    RELEASE loPkey
    RELEASE loRsa
    CANCEL
ENDIF

* Get the signature as hex.
loRsa.EncodingMode = "hex"

lcStrData = "This is the string to be signed."

* Sign the string using the sha-1 hash algorithm.
* Other valid choices are "md2", "md5", "sha256",
* "sha384", and "sha512".
lcHexSig = loRsa.SignStringENC(lcStrData,"sha-1")

? lcHexSig

? "Success!"

RELEASE loPkey
RELEASE loRsa