Swift

RSA Signature using Private Key from .snk File

See more RSA Examples

A .snk file (Strong Name Key file) is a file format used in the .NET ecosystem to store an RSA public/private key pair. This key pair is typically used for strong-naming assemblies, which is a process of signing .NET assemblies to ensure their integrity and to uniquely identify them.

This example loads a private key from a .snk file and creates an RSA signature.

Swift

func chilkatTest() {
    var success: Bool = false

    let rsa = CkoRsa()!

    // Load the .snk and return the private key as XML.
    var xmlStr: String? = rsa.snk(toXml: "./test.snk")
    if rsa.lastMethodSuccess == false {
        print("\(rsa.lastErrorText!)")
        return
    }

    let privKey = CkoPrivateKey()!
    success = privKey.loadXml(xml: xmlStr)
    if success == false {
        print("\(privKey.lastErrorText!)")
        return
    }

    success = rsa.usePrivateKey(privKey: privKey)
    if success == false {
        print("\(rsa.lastErrorText!)")
        return
    }

    // Sign the SHA-256 hash of the utf-8 byte representation of the contents of sb
    // Return the signature in base64 format.
    rsa.encodingMode = "base64"
    rsa.charset = "utf-8"
    var sigBase64: String? = rsa.signStringENC(str: "This is the text to be hashed and signed.", hashAlg: "sha256")
    if rsa.lastMethodSuccess == false {
        print("\(rsa.lastErrorText!)")
        return
    }

    print("RSA signature as base64: \(sigBase64!)")

}