PowerBuilder

RSA Sign an Encoded Hash

See more RSA Examples

Demonstrates signing a hash (e.g., SHA256) provided as an encoded string (e.g., base64 or hex). PowerBuilder

integer li_rc
integer li_Success
oleobject loo_Cert
oleobject loo_Bd
integer i
oleobject loo_Rsa
string ls_Sha256_base64
string ls_RsaSig_base64

li_Success = 0

// Assuming the smartcard/USB token is installed with the correct drivers from the manufacturer,
// this code can work on multiple platforms including Windows, MacOS, Linux, and iOS.

// Chilkat automatically detects and determines the way in which the HSM is used,
// which can be by PKCS11, Apple Keychain, Microsoft CNG / Crypto API, or ScMinidriver.

loo_Cert = create oleobject
li_rc = loo_Cert.ConnectToNewObject("Chilkat.Cert")
if li_rc < 0 then
    destroy loo_Cert
    MessageBox("Error","Connecting to COM object failed")
    return
end if

// Set the token/smartcard PIN prior to loading.
loo_Cert.SmartCardPin = "123456"

// Specify the certificate by its common name.
li_Success = loo_Cert.LoadFromSmartcard("cn=chilkat-rsa-2048")
if li_Success = 0 then
    Write-Debug loo_Cert.LastErrorText
    destroy loo_Cert
    return
end if

Write-Debug "Signing with the private key for this cert: " + loo_Cert.SubjectCN

// Create data to be hashed and signed.
loo_Bd = create oleobject
li_rc = loo_Bd.ConnectToNewObject("Chilkat.BinData")

for i = 0 to 100
    loo_Bd.AppendEncoded("000102030405060708090A0B0C0D0E0F","hex")
next

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

// Use the certificate's private key for signing.
li_Success = loo_Rsa.SetX509Cert(loo_Cert,1)
if li_Success = 0 then
    Write-Debug loo_Rsa.LastErrorText
    destroy loo_Cert
    destroy loo_Bd
    destroy loo_Rsa
    return
end if

// We'll first compute the hash and then pass the encoded hash to be signed.
ls_Sha256_base64 = loo_Bd.GetHash("sha256","base64")
Write-Debug "sha256 hash in base64 format: " + ls_Sha256_base64

// Pass in the base64 hash and return a base64 signature.
loo_Rsa.EncodingMode = "base64"
ls_RsaSig_base64 = loo_Rsa.SignHashENC(ls_Sha256_base64,"sha256")
if li_Success = 0 then
    Write-Debug loo_Rsa.LastErrorText
    destroy loo_Cert
    destroy loo_Bd
    destroy loo_Rsa
    return
end if

Write-Debug "RSA signature as base64: " + ls_RsaSig_base64


destroy loo_Cert
destroy loo_Bd
destroy loo_Rsa