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(Swift) RSA Signature/Verify with .key and .cerSee more RSA ExamplesDemonstrates how to use a .key file (private key) and digital certificate (.cer, public key) to create and verify an RSA signature.
func chilkatTest() { // This example assumes the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. let privKey = CkoPrivateKey()! // Load the private key from an RSA .key file: var success: Bool = privKey.loadPemFile("privateKey.key") if success != true { print("\(privKey.lastErrorText!)") return } var privKeyXml: String? // Get the private key in XML format: privKeyXml = privKey.getXml() let rsa = CkoRsa()! // Import the private key into the RSA component: success = rsa.importPrivateKey(privKeyXml) if success != true { print("\(rsa.lastErrorText!)") return } // Create the signature as a hex string: rsa.encodingMode = "hex" var strData: String? = "This is the string to be signed." // Sign the string using the sha-1 hash algorithm. // Other valid choices are "md2", "sha256", "sha384", // "sha512", and "md5". var hexSig: String? = rsa.signStringENC(strData, hashAlg: "sha-1") print("\(hexSig!)") // Load a digital certificate from a .cer file: let cert = CkoCert()! success = cert.load(fromFile: "myCert.cer") if success != true { print("\(cert.lastErrorText!)") return } var pubKey: CkoPublicKey? pubKey = cert.exportPublicKey() // Now verify using a separate instance of the RSA object: let rsa2 = CkoRsa()! // Import the public key into the RSA object: success = rsa2.importPublicKey(pubKey!.getXml()) if success != true { print("\(rsa2.lastErrorText!)") return } pubKey = nil // The signature is a hex string, so make sure the EncodingMode is correct: rsa2.encodingMode = "hex" // Verify the signature: success = rsa2.verifyStringENC(strData, hashAlg: "sha-1", sig: hexSig) if success != true { print("\(rsa2.lastErrorText!)") return } print("Success.") } |
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