B4X

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.

B4X

Dim success As Boolean = False

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

Dim cert As ChilkatCert
cert.Initialize("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
    Log(cert.LastErrorText)
    Return
End If


Dim rsa As ChilkatRsa
rsa.Initialize
success = rsa.SetX509Cert(cert, True)
If success = False Then
    Log(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 = rsa.SignStringENC("to be signed", "sha256")
If rsa.LastMethodSuccess = False Then
    Log(rsa.LastErrorText)
    Return
End If


Log("RSA Signature:")
Log(sigBase64)