(PowerBuilder) RSA Hash Binary Data and Sign (and Verify)

Demonstrates how to sign the hash of binary data. Also demonstrates how to verify the RSA signature.

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

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

integer li_rc
integer li_Success
oleobject loo_PrivKey
oleobject loo_Rsa
string ls_OriginalData
oleobject loo_BdData
oleobject loo_BdSignature
oleobject loo_PubKey
oleobject loo_Rsa2
integer li_BVerified

li_Success = 0

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

// Load an RSA private key for signing.
loo_PrivKey = create oleobject
li_rc = loo_PrivKey.ConnectToNewObject("Chilkat.PrivateKey")
if li_rc < 0 then
    destroy loo_PrivKey
    MessageBox("Error","Connecting to COM object failed")
    return
end if
li_Success = loo_PrivKey.LoadEncryptedPemFile("qa_data/pem/rsa_passwd.pem","passwd")
if li_Success = 0 then
    Write-Debug loo_PrivKey.LastErrorText
    destroy loo_PrivKey
    return
end if

loo_Rsa = create oleobject
li_rc = loo_Rsa.ConnectToNewObject("Chilkat.Rsa")

loo_Rsa.UsePrivateKey(loo_PrivKey)

// We have some binary data (in hex) to sign
ls_OriginalData = "0102030405060708090A"
loo_BdData = create oleobject
li_rc = loo_BdData.ConnectToNewObject("Chilkat.BinData")

loo_BdData.AppendEncoded(ls_OriginalData,"hex")

// Hash (SHA-256) and sign the hash:
loo_BdSignature = create oleobject
li_rc = loo_BdSignature.ConnectToNewObject("Chilkat.BinData")

li_Success = loo_Rsa.SignBd(loo_BdData,"sha256",loo_BdSignature)
if li_Success = 0 then
    Write-Debug loo_Rsa.LastErrorText
    destroy loo_PrivKey
    destroy loo_Rsa
    destroy loo_BdData
    destroy loo_BdSignature
    return
end if

// Show the RSA signature in base64
Write-Debug loo_BdSignature.GetEncoded("base64")

// ------------------------------------------
// Get the public key from the private key
loo_PubKey = create oleobject
li_rc = loo_PubKey.ConnectToNewObject("Chilkat.PublicKey")

loo_PrivKey.ToPublicKey(loo_PubKey)

// Verify the signature..
loo_Rsa2 = create oleobject
li_rc = loo_Rsa2.ConnectToNewObject("Chilkat.Rsa")

loo_Rsa2.UsePublicKey(loo_PubKey)

li_BVerified = loo_Rsa2.VerifyBd(loo_BdData,"sha256",loo_BdSignature)
Write-Debug "signature verified: " + string(li_BVerified)


destroy loo_PrivKey
destroy loo_Rsa
destroy loo_BdData
destroy loo_BdSignature
destroy loo_PubKey
destroy loo_Rsa2