(Swift) RSA Encrypt and OpenSSL Decrypt

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

Note: This example requires Chilkat v11.0.0 or greater.

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func chilkatTest() {
    var success: Bool = false

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

    let rsa = CkoRsa()!

    let privKey = CkoPrivateKey()!
    success = rsa.genKey(2048, privKey: privKey)
    success = privKey.savePkcs8PemFile("qa_output/privKey.pem")

    let pubKey = CkoPublicKey()!
    privKey.to(pubKey)

    rsa.encodingMode = "base64"
    var plainText: String? = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz01234567890"
    var bUsePrivateKey: Bool = false
    rsa.use(pubKey)
    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")

}