Go

Apple Keychain - Create RSA Signature

See more Apple Keychain Examples

Using an RSA private key stored in the Apple Keychain, create a signature by signing the SHA-256 hash of the provided string, then return the signature encoded in Base64 format.

Note: This example requires Chilkat v10.0.0 or greater.

Go

    success := false

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

    cert := chilkat.NewCert()

    // On MacOS and iOS, the LoadByCommonName function will search the Apple Keychain for the matching certificate.

    // A digital certificate's Common Name (CN) is a field in the certificate that specifies the name of the entity the 
    // certificate is issued to. It is often used to identify the domain name, hostname, or organization the certificate represents. 

    // For example:
    // - In an SSL/TLS certificate for a website, the CN typically contains the domain name (e.g., "www.example.com").
    // - For certificates representing individuals or organizations, the CN might include the person's name or the organization's name.

    // The CN is part of the certificate's Subject field and is crucial for verifying that the certificate corresponds 
    // to the intended entity, especially in SSL/TLS communications.

    success = cert.LoadByCommonName("Example, Inc.")
    if success == false {
        fmt.Println(cert.LastErrorText())
        cert.DisposeCert()
        return
    }

    rsa := chilkat.NewRsa()
    success = rsa.SetX509Cert(cert,true)
    if success == false {
        fmt.Println(rsa.LastErrorText())
        cert.DisposeCert()
        rsa.DisposeRsa()
        return
    }

    // Generate an RSA signature by signing the SHA-256 hash of the provided string, 
    // then return the signature encoded in Base64 format.
    rsa.SetEncodingMode("base64")
    sigBase64 := rsa.SignStringENC("to be signed","sha256")
    if rsa.LastMethodSuccess() == false {
        fmt.Println(rsa.LastErrorText())
        cert.DisposeCert()
        rsa.DisposeRsa()
        return
    }

    fmt.Println("RSA Signature:")
    fmt.Println(*sigBase64)

    cert.DisposeCert()
    rsa.DisposeRsa()