From 5e0a8cf73855b311c5841e629a037d9889cda3de Mon Sep 17 00:00:00 2001
From: Jason Rhinelander <jason@imaginary.ca>
Date: Mon, 13 Apr 2020 17:22:49 -0300
Subject: [PATCH] Add ed25519 key to snode address script to contrib

---
 contrib/hex-to-base32z.py | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)
 create mode 100755 contrib/hex-to-base32z.py

diff --git a/contrib/hex-to-base32z.py b/contrib/hex-to-base32z.py
new file mode 100755
index 000000000..41e561bbc
--- /dev/null
+++ b/contrib/hex-to-base32z.py
@@ -0,0 +1,30 @@
+#!/usr/bin/python3
+
+import sys
+
+base32z_dict = 'ybndrfg8ejkmcpqxot1uwisza345h769'
+
+def lokinet_snode_addr(pk_hex):
+    """Returns the lokinet snode address from a hex ed25519 pubkey"""
+    assert(len(pk_hex) == 64)
+    bits = 0
+    val = 0
+    result = ''
+    for x in pk_hex:
+        bits += 4
+        val = (val << 4) + int(x, 16)
+        if bits >= 5:
+            bits -= 5
+            v = val >> bits
+            val &= (1 << bits) - 1
+            result += base32z_dict[v]
+    result += base32z_dict[val << (5 - bits)]
+    return result + ".snode"
+
+if len(sys.argv) < 2 or any(len(x) != 64 for x in sys.argv[1:]):
+    print("Usage: {} PUBKEY [PUBKEY ...] -- converts ed25519 pubkeys to .snode addresses".format(sys.argv[0]))
+    sys.exit(1)
+
+for key in sys.argv[1:]:
+    print("{} -> {}".format(key, lokinet_snode_addr(key)))
+