Swift

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. Swift

func chilkatTest() {
    var success: Bool = 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.)
    let certStore = CkoCertStore()!

    // The 1st argument is the filename, the 2nd arg is the 
    // PFX file's password:
    success = certStore.loadPfxFile(path: "chilkat.pfx", password: "test")
    if success == false {
        print("\(certStore.lastErrorText!)")
        return
    }

    // Find the certificate by the subject common name:
    let jsonCN = CkoJsonObject()!
    jsonCN.updateString(jsonPath: "CN", value: "cert common name")

    let cert = CkoCert()!
    success = certStore.findCert(json: jsonCN, cert: cert)
    if success == false {
        print("\(certStore.lastErrorText!)")
        return
    }

    let privKey = CkoPrivateKey()!
    success = cert.getPrivateKey(privKey: privKey)
    if success == false {
        print("\(cert.lastErrorText!)")
        return
    }

    let rsa = CkoRsa()!

    success = rsa.usePrivateKey(privKey: privKey)
    if success == false {
        print("\(rsa.lastErrorText!)")
        return
    }

    // Encode the signature as a hex string
    rsa.encodingMode = "hex"

    var strData: String? = "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".
    var hexSig: String? = rsa.signStringENC(str: strData, hashAlg: "sha-1")

    print("\(hexSig!)")

    print("Success!")

}