Go

RSA Signature with Certificate's Private Key from PFX

See more RSA Examples

Demonstrates how to use a certificate's private key from a PFX file to create an RSA signature. Go

    success := false

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

    // Create an instance of a certificate store object, load a PFX file,
    // locate the certificate we need, and use it for signing.
    // (a PFX file may contain more than one certificate.)
    certStore := chilkat.NewCertStore()

    // The 1st argument is the filename, the 2nd arg is the 
    // PFX file's password:
    success = certStore.LoadPfxFile("chilkat.pfx","test")
    if success == false {
        fmt.Println(certStore.LastErrorText())
        certStore.DisposeCertStore()
        return
    }

    // Find the certificate by the subject common name:
    jsonCN := chilkat.NewJsonObject()
    jsonCN.UpdateString("CN","cert common name")

    cert := chilkat.NewCert()
    success = certStore.FindCert(jsonCN,cert)
    if success == false {
        fmt.Println(certStore.LastErrorText())
        certStore.DisposeCertStore()
        jsonCN.DisposeJsonObject()
        cert.DisposeCert()
        return
    }

    privKey := chilkat.NewPrivateKey()
    success = cert.GetPrivateKey(privKey)
    if success == false {
        fmt.Println(cert.LastErrorText())
        certStore.DisposeCertStore()
        jsonCN.DisposeJsonObject()
        cert.DisposeCert()
        privKey.DisposePrivateKey()
        return
    }

    rsa := chilkat.NewRsa()

    success = rsa.UsePrivateKey(privKey)
    if success == false {
        fmt.Println(rsa.LastErrorText())
        certStore.DisposeCertStore()
        jsonCN.DisposeJsonObject()
        cert.DisposeCert()
        privKey.DisposePrivateKey()
        rsa.DisposeRsa()
        return
    }

    // Encode the signature as a hex string
    rsa.SetEncodingMode("hex")

    strData := "This is the string to be signed."

    // Sign the string using the sha-1 hash algorithm.
    // Other valid choices are "sha-256", "md2" and "md5".
    hexSig := rsa.SignStringENC(strData,"sha-1")

    fmt.Println(*hexSig)

    fmt.Println("Success!")

    certStore.DisposeCertStore()
    jsonCN.DisposeJsonObject()
    cert.DisposeCert()
    privKey.DisposePrivateKey()
    rsa.DisposeRsa()