X-Git-Url: http://www.git.stargrave.org/?p=tofuproxy.git;a=blobdiff_plain;f=tls%2Ftolower.go;fp=tls%2Ftolower.go;h=321441edd7ace0866f951f19c438340b0ad5c03a;hp=0000000000000000000000000000000000000000;hb=b11ace4832d2318235cdb1f836bb3677f6e52a20;hpb=00a1f9bafbb9a03c3753c2e3aee185b0a5fbb344

diff --git a/tls/tolower.go b/tls/tolower.go
new file mode 100644
index 0000000..321441e
--- /dev/null
+++ b/tls/tolower.go
@@ -0,0 +1,28 @@
+package tofuproxy
+
+import "unicode/utf8"
+
+// Copy-pasted from crypto/x509, as it is not public.
+func toLowerCaseASCII(in string) string {
+	isAlreadyLowerCase := true
+	for _, c := range in {
+		if c == utf8.RuneError {
+			isAlreadyLowerCase = false
+			break
+		}
+		if 'A' <= c && c <= 'Z' {
+			isAlreadyLowerCase = false
+			break
+		}
+	}
+	if isAlreadyLowerCase {
+		return in
+	}
+	out := []byte(in)
+	for i, c := range out {
+		if 'A' <= c && c <= 'Z' {
+			out[i] += 'a' - 'A'
+		}
+	}
+	return string(out)
+}