Xojo Plugin

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.

Xojo Plugin

Dim success As Boolean
success = False

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

Dim cert As New Chilkat.Cert

// 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) Then
    System.DebugLog(cert.LastErrorText)
    Return
End If

Dim rsa As New Chilkat.Rsa
success = rsa.SetX509Cert(cert,True)
If (success = False) Then
    System.DebugLog(rsa.LastErrorText)
    Return
End If

// Generate an RSA signature by signing the SHA-256 hash of the provided string, 
// then return the signature encoded in Base64 format.
rsa.EncodingMode = "base64"
Dim sigBase64 As String
sigBase64 = rsa.SignStringENC("to be signed","sha256")
If (rsa.LastMethodSuccess = False) Then
    System.DebugLog(rsa.LastErrorText)
    Return
End If

System.DebugLog("RSA Signature:")
System.DebugLog(sigBase64)