Swift

Convert RSA Private Key to Public Key

See more RSA Examples

Demonstrates how to get a public RSA key from a private RSA key. Swift

func chilkatTest() {
    var success: Bool = false

    let privKey = CkoPrivateKey()!

    // Step 1: Load the private key from a source.
    // (Chilkat can load private keys from all types of formats, and from in-memory bytes or encoded strings.
    // see the online reference documentation for more options.)
    success = privKey.loadPemFile(path: "qa_data/pem/VP_Private.pem")
    if success == false {
        print("\(privKey.lastErrorText!)")
        return
    }

    // Step 2: Get the public key object from the private key object.
    let pubKey = CkoPublicKey()!
    privKey.toPublicKey(pubKey: pubKey)

    // Step 3: Save the public key in a desired format. 
    // (Chilkat can load or save public and private keys in many different formats.  See
    // the online reference documentation for more options.)

    // Saves to a PKCS8 PEM file.
    var bPreferPkcs1: Bool = false
    success = pubKey.savePemFile(preferPkcs1: bPreferPkcs1, path: "qa_data/pem/VP_Public.pem")
    if pubKey.lastMethodSuccess == false {
        print("\(pubKey.lastErrorText!)")
        return
    }

    print("Extracted and saved public key from private key.")

}