1 files changed, 70 insertions, 0 deletions
diff --git a/test/functional/test_framework/base58.py b/test/functional/test_framework/base58.py
new file mode 100644
index 0000000000..3dab3569d0
--- /dev/null
+++ b/test/functional/test_framework/base58.py
@@ -0,0 +1,70 @@
+#!/usr/bin/env python3
+# Copyright (c) 2016-2020 The Bitcoin Core developers
+# Distributed under the MIT software license, see the accompanying
+# file COPYING or http://www.opensource.org/licenses/mit-license.php.
+"""Encode BASE58."""
+
+import unittest
+
+from .messages import hash256
+from .util import hex_str_to_bytes, assert_equal
+
+chars = '123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz'
+
+def byte_to_base58(b, version):
+    result = ''
+    str = b.hex()
+    str = chr(version).encode('latin-1').hex() + str
+    checksum = hash256(hex_str_to_bytes(str)).hex()
+    str += checksum[:8]
+    value = int('0x'+str,0)
+    while value > 0:
+        result = chars[value % 58] + result
+        value //= 58
+    while (str[:2] == '00'):
+        result = chars[0] + result
+        str = str[2:]
+    return result
+
+def base58_to_byte(s, verify_checksum=True):
+    if not s:
+        return b''
+    n = 0
+    for c in s:
+        n *= 58
+        assert c in chars
+        digit = chars.index(c)
+        n += digit
+    h = '%x' % n
+    if len(h) % 2:
+        h = '0' + h
+    res = n.to_bytes((n.bit_length() + 7) // 8, 'big')
+    pad = 0
+    for c in s:
+        if c == chars[0]:
+            pad += 1
+        else:
+            break
+    res = b'\x00' * pad + res
+    if verify_checksum:
+        assert_equal(hash256(res[:-4])[:4], res[-4:])
+
+    return res[1:-4], int(res[0])
+
+class TestFrameworkScript(unittest.TestCase):
+    def test_base58encodedecode(self):
+        def check_base58(data, version):
+            self.assertEqual(base58_to_byte(byte_to_base58(data, version)), (data, version))
+
+        check_base58(b'\x1f\x8e\xa1p*{\xd4\x94\x1b\xca\tA\xb8R\xc4\xbb\xfe\xdb.\x05', 111)
+        check_base58(b':\x0b\x05\xf4\xd7\xf6l;\xa7\x00\x9fE50)l\x84\\\xc9\xcf', 111)
+        check_base58(b'A\xc1\xea\xf1\x11\x80%Y\xba\xd6\x1b`\xd6+\x1f\x89|c\x92\x8a', 111)
+        check_base58(b'\0A\xc1\xea\xf1\x11\x80%Y\xba\xd6\x1b`\xd6+\x1f\x89|c\x92\x8a', 111)
+        check_base58(b'\0\0A\xc1\xea\xf1\x11\x80%Y\xba\xd6\x1b`\xd6+\x1f\x89|c\x92\x8a', 111)
+        check_base58(b'\0\0\0A\xc1\xea\xf1\x11\x80%Y\xba\xd6\x1b`\xd6+\x1f\x89|c\x92\x8a', 111)
+        check_base58(b'\x1f\x8e\xa1p*{\xd4\x94\x1b\xca\tA\xb8R\xc4\xbb\xfe\xdb.\x05', 0)
+        check_base58(b':\x0b\x05\xf4\xd7\xf6l;\xa7\x00\x9fE50)l\x84\\\xc9\xcf', 0)
+        check_base58(b'A\xc1\xea\xf1\x11\x80%Y\xba\xd6\x1b`\xd6+\x1f\x89|c\x92\x8a', 0)
+        check_base58(b'\0A\xc1\xea\xf1\x11\x80%Y\xba\xd6\x1b`\xd6+\x1f\x89|c\x92\x8a', 0)
+        check_base58(b'\0\0A\xc1\xea\xf1\x11\x80%Y\xba\xd6\x1b`\xd6+\x1f\x89|c\x92\x8a', 0)
+        check_base58(b'\0\0\0A\xc1\xea\xf1\x11\x80%Y\xba\xd6\x1b`\xd6+\x1f\x89|c\x92\x8a', 0)