Swift

DSA Generate Key

See more DSA Examples

Generates a DSA public/private key pair and saves to PEM and DER file formats (both encrypted and non-encrypted).

An encrypted DSA PEM looks like this:

-----BEGIN DSA PRIVATE KEY-----
Proc-Type: 4,ENCRYPTED
DEK-Info: DES-EDE3-CBC,9DAFD5C4CD62A5D0

QwDdp66sB0qKXQli7FbVcKL/eo3wu7kGRlV2sI8XbkNa1RTLiwnwTWDB0dqyWRQ8
...
Bx0HVfxKiNgCbL6BQEnYD+GOmMcckuj9Uhgloe/YuXCIDJBGhjUt/li3hvR/PXeC

V2xxNl1XKBE88njqi+UXt4vjGVNLpvXM
-----END DSA PRIVATE KEY-----

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.

    let dsa = CkoDsa()!

    // Call GenKey to generate a new DSA key.
    // The number of bits should be at least 1024 and a multiple
    // of 64.   Typical values are either 1024 or 2048.
    // DSA key generation is compute intensive and may take
    // a short while to complete.
    success = dsa.genKey(numBits: 2048)
    if success != true {
        print("\(dsa.lastErrorText!)")
        return
    }

    // Extract the private and public parts to PEM or DER format
    // and save to files...
    var pemStr: String?
    var xmlStr: String?

    // First for the public key...
    // The public key never needs to be encrypted.

    // Save the public key in PEM format:
    pemStr = dsa.toPublicPem()
    // This example will not check the return value of SaveText...
    success = dsa.saveText(strToSave: pemStr, path: "dsa_pub.pem")

    // Save the public key in DER format:
    success = dsa.toPublicDerFile(path: "dsa_pub.der")

    var bPublicOnly: Bool = true
    // Save to XML
    xmlStr = dsa.toXml(bPublicOnly: bPublicOnly)
    success = dsa.saveText(strToSave: xmlStr, path: "dsa_pub.xml")

    // ------------------------------------
    // Now for the private key....
    // ------------------------------------

    // Unencrypted PEM:
    pemStr = dsa.toPem()
    success = dsa.saveText(strToSave: pemStr, path: "dsa_priv.pem")

    // Encrypted PEM:
    pemStr = dsa.toEncryptedPem(password: "myPassword")
    success = dsa.saveText(strToSave: pemStr, path: "dsa_privEncrypted.pem")

    // DER:
    success = dsa.toDerFile(path: "dsa_priv.der")

    // XML:
    bPublicOnly = false
    xmlStr = dsa.toXml(bPublicOnly: bPublicOnly)
    success = dsa.saveText(strToSave: xmlStr, path: "dsa_priv.xml")

    print("Finished!")

}