From ef94324f2e75e8a08181e681a3c761938d794758 Mon Sep 17 00:00:00 2001
From: fiatjaf <fiatjaf@gmail.com>
Date: Thu, 28 Sep 2023 15:35:07 -0300
Subject: [PATCH] implement ripemd160 just so we can validate peter todd's old
 examples.

---
 ots.go    | 2 +-
 unused.go | 9 +++++++++
 2 files changed, 10 insertions(+), 1 deletion(-)
 create mode 100644 unused.go

diff --git a/ots.go b/ots.go
index c0eb09d..d6c1591 100644
--- a/ots.go
+++ b/ots.go
@@ -44,7 +44,7 @@ var tags = map[byte]*Operation{
 	0xf2: {"reverse", 0xf2, false, func(curr []byte, arg []byte) []byte { panic("reverse not implemented") }},
 	0xf3: {"hexlify", 0xf3, false, func(curr []byte, arg []byte) []byte { panic("hexlify not implemented") }},
 	0x02: {"sha1", 0x02, false, func(curr []byte, arg []byte) []byte { panic("sha1 not implemented") }},
-	0x03: {"ripemd160", 0x03, false, func(curr []byte, arg []byte) []byte { panic("ripemd160 not implemented") }},
+	0x03: {"ripemd160", 0x03, false, ripemd160},
 	0x08: {"sha256", 0x08, false, func(curr []byte, arg []byte) []byte {
 		v := sha256.Sum256(curr)
 		return v[:]
diff --git a/unused.go b/unused.go
new file mode 100644
index 0000000..6118792
--- /dev/null
+++ b/unused.go
@@ -0,0 +1,9 @@
+package opentimestamps
+
+import (
+	deprecated_ripemd160 "golang.org/x/crypto/ripemd160"
+)
+
+func ripemd160(curr []byte, arg []byte) []byte {
+	return deprecated_ripemd160.New().Sum(curr)
+}