tlsrestrict: Added documentation to Sleeve256.

tlsrestrict_chromium/chromium.go

@@ -52,6 +52,9 @@ func BlockAllCAs() (map[string]interface{}, error) {
 	return rule, nil
 }
 
+// Calculates floor(2**256/pi), and encodes the result as base64.
+// Intended to be used as a SHA256 hash where I don't have a preimage up my sleeve.
+// Python2 version originally by Ryan Castellucci.  Go port, pi sourcing, and base64 output by Jeremy Rand.
 func Sleeve256() (string, error) {
 	var pi big.Float
 	var exp256Float big.Float

tlsrestrict_chromium/chromium_test.go

@@ -24,6 +24,8 @@ func TestSleeve256(t *testing.T) {
 		t.Error(err)
 	}
 
+	// To reproduce this with web-based tools, use https://www.wolframalpha.com/input/?i=hex%28floor%282^256%2Fpi%29%29
+	// and then convert from hex to base64 via https://holtstrom.com/michael/tools/hextopem.php
 	reference := "UXzBtyciCpT+E6vo+ppu4G2xSsyeIcgg/yix1e9d4rA="
 
 	if sleeve != reference {