From 56f62709ad14354d15c36984c8443e52d20166b5 Mon Sep 17 00:00:00 2001
From: Russ Magee <rmagee+simplyembedded@gmail.com>
Date: Mon, 22 Nov 2021 09:26:42 -0800
Subject: [PATCH] [nonworking] Groestl hash addition

---
 go.mod          | 3 +++
 xs/xs.go        | 3 ++-
 xsd/xsd.go      | 3 ++-
 xsnet/chan.go   | 4 ++++
 xsnet/consts.go | 1 +
 xsnet/net.go    | 6 ++++++
 6 files changed, 18 insertions(+), 2 deletions(-)

diff --git a/go.mod b/go.mod
index 3872ef3..d61b63b 100644
--- a/go.mod
+++ b/go.mod
@@ -2,6 +2,8 @@ module blitter.com/go/xs
 
 go 1.12
 
+replace groestl => ../groestl
+
 require (
 	blitter.com/go/cryptmt v1.0.2
 	blitter.com/go/goutmp v1.0.5
@@ -28,4 +30,5 @@ require (
 	gopkg.in/hlandau/easymetric.v1 v1.0.0 // indirect
 	gopkg.in/hlandau/measurable.v1 v1.0.1 // indirect
 	gopkg.in/hlandau/passlib.v1 v1.0.10
+	groestl v0.0.0-00010101000000-000000000000
 )
diff --git a/xs/xs.go b/xs/xs.go
index 1c8314d..b0d9bed 100755
--- a/xs/xs.go
+++ b/xs/xs.go
@@ -719,7 +719,8 @@ func main() {
       C_CHACHA20_12`)
 	flag.StringVar(&hmacAlg, "m", "H_SHA256", "session `HMAC`"+`
       H_SHA256
-      H_SHA512`)
+      H_SHA512
+      H_GROESTL256`)
 	flag.StringVar(&kexAlg, "k", "KEX_HERRADURA512", "KEx `alg`"+`
       KEX_HERRADURA256
       KEX_HERRADURA512
diff --git a/xsd/xsd.go b/xsd/xsd.go
index 98e83eb..dcef6dd 100755
--- a/xsd/xsd.go
+++ b/xsd/xsd.go
@@ -553,7 +553,8 @@ func main() {
 	flag.Var(&aHMACAlgs, "aH", "Allowed `HMAC`s (eg. '-aH HMACAlgA -aH HMACAlgB ...')" + `
       H_all
       H_SHA256
-      H_SHA512`)
+      H_SHA512
+      H_GROESTL256`)
 
 	flag.Parse()
 
diff --git a/xsnet/chan.go b/xsnet/chan.go
index 819083d..9b132cb 100644
--- a/xsnet/chan.go
+++ b/xsnet/chan.go
@@ -31,6 +31,7 @@ import (
 	// on this...)
 	_ "crypto/sha256"
 	_ "crypto/sha512"
+	groestl "groestl/pkg/groestl"
 )
 
 // Expand keymat, if necessary, to a minimum of 2x(blocksize).
@@ -144,6 +145,9 @@ func (hc *Conn) getStream(keymat []byte) (rc cipher.Stream, mc hash.Hash, err er
 		if !halg.Available() {
 			log.Fatal("hash not available!")
 		}
+	case HmacGroestl256:
+		log.Printf("[hash HmacGroestl256 (%d)]\n", hopts)
+		mc = groestl.New256()
 	default:
 		log.Printf("[invalid hmac (%d)]\n", hopts)
 		fmt.Printf("DOOFUS SET A VALID HMAC ALG (%d)\n", hopts)
diff --git a/xsnet/consts.go b/xsnet/consts.go
index 30833a2..0e45a02 100644
--- a/xsnet/consts.go
+++ b/xsnet/consts.go
@@ -118,6 +118,7 @@ type CSCipherAlg uint32
 const (
 	HmacSHA256 = iota
 	HmacSHA512
+	HmacGroestl256
 	HmacNoneDisallowed
 )
 
diff --git a/xsnet/net.go b/xsnet/net.go
index bfb002f..93c6351 100644
--- a/xsnet/net.go
+++ b/xsnet/net.go
@@ -174,6 +174,8 @@ func (h *CSHmacAlg) String() string {
 		return "H_SHA256"
 	case HmacSHA512:
 		return "H_SHA512"
+	case HmacGroestl256:
+		return "H_GROESTL256"
 	default:
 		return "H_ERR_UNK"
 	}
@@ -362,6 +364,10 @@ func (hc *Conn) applyConnExtensions(extensions ...string) {
 			log.Println("[extension arg = H_SHA512]")
 			hc.cipheropts &= (0xFFFF00FF)
 			hc.cipheropts |= (HmacSHA512 << 8)
+		case "H_GROESTL256":
+			log.Println("[extension arg = H_GROESTL256]")
+			hc.cipheropts &= (0xFFFF00FF)
+			hc.cipheropts |= (HmacGroestl256 << 8)
 			//default:
 			//	log.Printf("[Dial ext \"%s\" ignored]\n", s)
 		}