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(Visual FoxPro) ECDSA Sign and Verify Data using Different Hash Algorithms

Demonstrates how to create ECDSA signatures on data using different hash algorithms.

Note: This example requires Chilkat v9.5.0.85 or greater because the SignBd and VerifyBd methods were added in v9.5.0.85.

Chilkat ActiveX Downloads

ActiveX for 32-bit and 64-bit Windows

LOCAL loPrivKey
LOCAL lnSuccess
LOCAL loBd
LOCAL loEcdsa
LOCAL loPrng
LOCAL lcSig
LOCAL loPubKey
LOCAL loEcc2
LOCAL lnResult

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

* First load an ECDSA private key to be used for signing.
loPrivKey = CreateObject('Chilkat_9_5_0.PrivateKey')
lnSuccess = loPrivKey.LoadEncryptedPemFile("qa_data/ecc/secp256r1-key-pkcs8-secret.pem","secret")
IF (lnSuccess = 0) THEN
    ? loPrivKey.LastErrorText
    RELEASE loPrivKey
    CANCEL
ENDIF

* Load some data to be signed.
loBd = CreateObject('Chilkat_9_5_0.BinData')
lnSuccess = loBd.LoadFile("qa_data/hamlet.xml")
IF (lnSuccess = 0) THEN
    ? "Failed to load file to be hashed."
    RELEASE loPrivKey
    RELEASE loBd
    CANCEL
ENDIF

loEcdsa = CreateObject('Chilkat_9_5_0.Ecc')
loPrng = CreateObject('Chilkat_9_5_0.Prng')

* Sign the sha256 hash of the data.  Return the ECDSA signature in the base64 encoding.
? "ECDSA signing the sha256 hash of the data..."
lcSig = loEcdsa.SignBd(loBd,"sha256","base64",loPrivKey,loPrng)
? "sig = " + lcSig

* Verify the signature against the original data.
* (We must use the same hash algorithm that was used when signing.)

* Load the public key that corresponds to the private key used for signing.
loPubKey = CreateObject('Chilkat_9_5_0.PublicKey')
lnSuccess = loPubKey.LoadFromFile("qa_data/ecc/secp256r1-pub.pem")
IF (lnSuccess = 0) THEN
    ? loPubKey.LastErrorText
    RELEASE loPrivKey
    RELEASE loBd
    RELEASE loEcdsa
    RELEASE loPrng
    RELEASE loPubKey
    CANCEL
ENDIF

loEcc2 = CreateObject('Chilkat_9_5_0.Ecc')
lnResult = loEcc2.VerifyBd(loBd,"sha256",lcSig,"base64",loPubKey)
IF (lnResult <> 1) THEN
    ? loEcc2.LastErrorText
    RELEASE loPrivKey
    RELEASE loBd
    RELEASE loEcdsa
    RELEASE loPrng
    RELEASE loPubKey
    RELEASE loEcc2
    CANCEL
ENDIF

? "Verified!"

* ----------------------------------------------------------------------------------------
* Let's do the same thing, but with sha384 hashing...

? "--------------------------------------------"
? "ECDSA signing the sha384 hash of the data..."

lcSig = loEcdsa.SignBd(loBd,"sha384","base64",loPrivKey,loPrng)
? "sig = " + lcSig

lnResult = loEcc2.VerifyBd(loBd,"sha384",lcSig,"base64",loPubKey)
IF (lnResult <> 1) THEN
    ? loEcc2.LastErrorText
    RELEASE loPrivKey
    RELEASE loBd
    RELEASE loEcdsa
    RELEASE loPrng
    RELEASE loPubKey
    RELEASE loEcc2
    CANCEL
ENDIF

? "Verified!"

RELEASE loPrivKey
RELEASE loBd
RELEASE loEcdsa
RELEASE loPrng
RELEASE loPubKey
RELEASE loEcc2


 

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