(Swift 3,4,5...) RSA Encrypt and OpenSSL Decrypt

Demonstrates how to use Chilkat to RSA encrypt, and then use OpenSSL to decrypt.

Chilkat Downloads for the Swift Programming Language MAC OS X (Cocoa) Objective-C/Swift Libs iOS Objective-C/Swift Libs

func chilkatTest() {
    // This requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    let rsa = CkoRsa()!

    var success: Bool = rsa.generateKey(2048)

    var privKey: CkoPrivateKey? = rsa.exportPrivateKeyObj()
    success = privKey!.savePkcs8PemFile("qa_output/privKey.pem")
    privKey = nil

    rsa.encodingMode = "base64"
    var plainText: String? = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz01234567890"
    var bUsePrivateKey: Bool = false
    var encryptedStr: String? = rsa.encryptStringENC(plainText, bUsePrivateKey: bUsePrivateKey)

    let bd = CkoBinData()!
    bd.appendEncoded(encryptedStr, encoding: "base64")
    success = bd.writeFile("qa_output/enc.dat")

    // The OpenSSL command to decrypt is:
    // openssl pkeyutl -in enc.dat -inkey privKey.pem -keyform PEM -pkeyopt rsa_padding_mode:pkcs1 -decrypt

    print("OK")

}