From 17ff8aec3a0d2e0a520849c42c40a154a0831495 Mon Sep 17 00:00:00 2001
From: Christian Cleberg <hello@cleberg.net>
Date: Mon, 22 May 2023 15:37:34 -0500
Subject: initial commit

---
 vendor/eher/oauth/src/Eher/OAuth/RsaSha1.php | 70 ++++++++++++++++++++++++++++
 1 file changed, 70 insertions(+)
 create mode 100644 vendor/eher/oauth/src/Eher/OAuth/RsaSha1.php

(limited to 'vendor/eher/oauth/src/Eher/OAuth/RsaSha1.php')

diff --git a/vendor/eher/oauth/src/Eher/OAuth/RsaSha1.php b/vendor/eher/oauth/src/Eher/OAuth/RsaSha1.php
new file mode 100644
index 0000000..a749ce3
--- /dev/null
+++ b/vendor/eher/oauth/src/Eher/OAuth/RsaSha1.php
@@ -0,0 +1,70 @@
+<?php
+
+namespace Eher\OAuth\SignatureMethod;
+
+/**
+ * The RSA-SHA1 signature method uses the RSASSA-PKCS1-v1_5 signature algorithm as defined in
+ * [RFC3447] section 8.2 (more simply known as PKCS#1), using SHA-1 as the hash function for
+ * EMSA-PKCS1-v1_5. It is assumed that the Consumer has provided its RSA public key in a
+ * verified way to the Service Provider, in a manner which is beyond the scope of this
+ * specification.
+ *   - Chapter 9.3 ("RSA-SHA1")
+ */
+abstract class RsaSha1 extends SignatureMethod {
+  public function get_name() {
+    return "RSA-SHA1";
+  }
+
+  // Up to the SP to implement this lookup of keys. Possible ideas are:
+  // (1) do a lookup in a table of trusted certs keyed off of consumer
+  // (2) fetch via http using a url provided by the requester
+  // (3) some sort of specific discovery code based on request
+  //
+  // Either way should return a string representation of the certificate
+  protected abstract function fetch_public_cert(&$request);
+
+  // Up to the SP to implement this lookup of keys. Possible ideas are:
+  // (1) do a lookup in a table of trusted certs keyed off of consumer
+  //
+  // Either way should return a string representation of the certificate
+  protected abstract function fetch_private_cert(&$request);
+
+  public function build_signature($request, $consumer, $token) {
+    $base_string = $request->get_signature_base_string();
+    $request->base_string = $base_string;
+
+    // Fetch the private key cert based on the request
+    $cert = $this->fetch_private_cert($request);
+
+    // Pull the private key ID from the certificate
+    $privatekeyid = openssl_get_privatekey($cert);
+
+    // Sign using the key
+    $ok = openssl_sign($base_string, $signature, $privatekeyid);
+
+    // Release the key resource
+    openssl_free_key($privatekeyid);
+
+    return base64_encode($signature);
+  }
+
+  public function check_signature($request, $consumer, $token, $signature) {
+    $decoded_sig = base64_decode($signature);
+
+    $base_string = $request->get_signature_base_string();
+
+    // Fetch the public key cert based on the request
+    $cert = $this->fetch_public_cert($request);
+
+    // Pull the public key ID from the certificate
+    $publickeyid = openssl_get_publickey($cert);
+
+    // Check the computed signature against the one passed in the query
+    $ok = openssl_verify($base_string, $decoded_sig, $publickeyid);
+
+    // Release the key resource
+    openssl_free_key($publickeyid);
+
+    return $ok == 1;
+  }
+}
-- 
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