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(Swift) RSA Encrypt String to Encoded Result and ReverseSee more RSA ExamplesDemonstrates how to RSA encrypt a string to a base64 encoded result, and the reverse.
func chilkatTest() { // The RSA public key is used for encryption, and the private key for decryption. // The public key's role is to make encryption accessible to anyone while ensuring that // only the private key holder can decrypt the messages. // The public key is designed to be widely distributed so anyone can use it to encrypt messages // intended for the owner of the private key. // Load our 2048-bit RSA public key. let pubKey = CkoPublicKey()! // In all Chilkat methods expecting a path, you pass either absolute or relative paths. var success: Bool = pubKey.load(fromFile: "rsaKeys/myTestRsaPublic.pem") if success == false { print("\(pubKey.lastErrorText!)") return } let rsa = CkoRsa()! // Tell RSA to use the public key. rsa.importPublicKeyObj(pubKey) // RSA encryption is for small amounts of data, on the order of 200 bytes or less. // The maximum number of bytes that can be RSA encrypted depends // on the RSA key size and padding scheme (OAEP padding vs PKCS#1 v1.5 padding). // For specific limits, see: RSA Encryption Maximum Number of Bytes // Encrypt the utf-8 byte representation of the string. rsa.charset = "utf-8" rsa.encodingMode = "base64" // Be Careful when Using non-us-ascii String Literals in Source Code var encryptedB64: String? = rsa.encryptStringENC("Élève français dîne à côté d’un café où l’on sert déjà du gâteau au chocolat et des éclairs délicieux", bUsePrivateKey: false) // ------------------------------------------------------------------------------------------------------------------------ // Let's decrypt, which requires the matching private key... // Load the matching 2048-bit RSA private key. let privKey = CkoPrivateKey()! var password: String? = "secret" success = privKey.loadAnyFormatFile("rsaKeys/myTestRsaPrivate.pem", password: password) if success == false { print("\(privKey.lastErrorText!)") return } // Tell the RSA object to use the private key. rsa.importPrivateKeyObj(privKey) // Indicate that after decrypting the resultant decrypted bytes contains the utf-8 byte representation of the text. rsa.charset = "utf-8" rsa.encodingMode = "base64" var originalText: String? = rsa.decryptStringENC(encryptedB64, bUsePrivateKey: true) if success == false { print("\(rsa.lastErrorText!)") return } print("Original text = \(originalText!)") print("Success.") } |
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