Lianja

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.

Lianja

llSuccess = .F.

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

loCert = createobject("CkCert")

// 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.

llSuccess = loCert.LoadByCommonName("Example, Inc.")
if (llSuccess = .F.) then
    ? loCert.LastErrorText
    release loCert
    return
endif

loRsa = createobject("CkRsa")
llSuccess = loRsa.SetX509Cert(loCert,.T.)
if (llSuccess = .F.) then
    ? loRsa.LastErrorText
    release loCert
    release loRsa
    return
endif

// Generate an RSA signature by signing the SHA-256 hash of the provided string, 
// then return the signature encoded in Base64 format.
loRsa.EncodingMode = "base64"
lcSigBase64 = loRsa.SignStringENC("to be signed","sha256")
if (loRsa.LastMethodSuccess = .F.) then
    ? loRsa.LastErrorText
    release loCert
    release loRsa
    return
endif

? "RSA Signature:"
? lcSigBase64


release loCert
release loRsa