(Visual FoxPro) Duplicate openssl dgst -md5 -sign myKey.pem something.txt | openssl enc -base64 -A

Demonstrates how to duplicate the creation of an RSA signature produced by this OpenSSL command:

openssl dgst -md5 -sign myKey.pem something.txt | openssl enc -base64 -A

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

LOCAL loPkey
LOCAL lnSuccess
LOCAL lcPkeyXml
LOCAL loRsa
LOCAL lnSuccess
LOCAL lcStrData
LOCAL lcBase64Sig

loPkey = CreateObject('Chilkat_9_5_0.PrivateKey')

*  Load the private key from an RSA PEM file:
lnSuccess = loPkey.LoadPemFile("myKey.pem")

*  Get the private key in XML format:
lcPkeyXml = loPkey.GetXml()

loRsa = CreateObject('Chilkat_9_5_0.Rsa')

*  Any string argument automatically begins the 30-day trial.
lnSuccess = loRsa.UnlockComponent("30-day trial")
IF (lnSuccess <> 1) THEN
    ? loRsa.LastErrorText
    RELEASE loPkey
    RELEASE loRsa
    CANCEL
ENDIF

*  Import the private key into the RSA component:
lnSuccess = loRsa.ImportPrivateKey(lcPkeyXml)
IF (lnSuccess <> 1) THEN
    ? loRsa.LastErrorText
    RELEASE loPkey
    RELEASE loRsa
    CANCEL
ENDIF

*  OpenSSL uses BigEndian byte ordering:
loRsa.LittleEndian = 0

*  The resulting signature will be a Base64 string:
loRsa.EncodingMode = "base64"

*  For simplicity, we're not loading
*  the data to be signed from a file.  We are instead simply
*  using a literal string value.
lcStrData = "This is the text to be signed."

*  Hash the input using MD5, and then sign the hash:
*  Other valid hash algorithm choices are "md2" and "sha-1".
lcBase64Sig = loRsa.SignStringENC(lcStrData,"md5")

? lcBase64Sig

? "Success!"

RELEASE loPkey
RELEASE loRsa