SecCertificate and SecKey from DER certificate in base64

ParseDERCertificate.swift

let crtBase64 = "..."

if let certificateData = Data(base64Encoded: crtBase64, options: []),
    let certificate = SecCertificateCreateWithData(nil, certificateData as CFData) {
    //  use certificate to initialize PinnedCertificatesTrustEvaluator, or ...
    
    var trust: SecTrust?
    let policy = SecPolicyCreateBasicX509()
    let status = SecTrustCreateWithCertificates(certificate, policy, &trust)
    
    if status == errSecSuccess, let trust = trust,
        let publicKey = SecTrustCopyPublicKey(trust) {
        //  ... use publicKey to initialize PublicKeysTrustEvaluator
    }
}