From 3bef51eec2299403467e621ae660cef3f9256ac8 Mon Sep 17 00:00:00 2001
From: Determinant <tederminant@gmail.com>
Date: Tue, 17 Nov 2020 18:47:40 -0500
Subject: update frozen deps

---
 frozen_deps/base58/__init__.py | 130 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 130 insertions(+)
 create mode 100644 frozen_deps/base58/__init__.py

(limited to 'frozen_deps/base58/__init__.py')

diff --git a/frozen_deps/base58/__init__.py b/frozen_deps/base58/__init__.py
new file mode 100644
index 0000000..ff2fa18
--- /dev/null
+++ b/frozen_deps/base58/__init__.py
@@ -0,0 +1,130 @@
+'''Base58 encoding
+
+Implementations of Base58 and Base58Check encodings that are compatible
+with the bitcoin network.
+'''
+
+# This module is based upon base58 snippets found scattered over many bitcoin
+# tools written in python. From what I gather the original source is from a
+# forum post by Gavin Andresen, so direct your praise to him.
+# This module adds shiny packaging and support for python3.
+
+from hashlib import sha256
+from typing import Union
+
+__version__ = '2.0.1'
+
+# 58 character alphabet used
+BITCOIN_ALPHABET = \
+    b'123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz'
+RIPPLE_ALPHABET = b'rpshnaf39wBUDNEGHJKLM4PQRST7VWXYZ2bcdeCg65jkm8oFqi1tuvAxyz'
+
+# Retro compatibility
+alphabet = BITCOIN_ALPHABET
+
+
+def scrub_input(v: Union[str, bytes]) -> bytes:
+    if isinstance(v, str):
+        v = v.encode('ascii')
+
+    return v
+
+
+def b58encode_int(
+    i: int, default_one: bool = True, alphabet: bytes = BITCOIN_ALPHABET
+) -> bytes:
+    """
+    Encode an integer using Base58
+    """
+    if not i and default_one:
+        return alphabet[0:1]
+    string = b""
+    while i:
+        i, idx = divmod(i, 58)
+        string = alphabet[idx:idx+1] + string
+    return string
+
+
+def b58encode(
+    v: Union[str, bytes], alphabet: bytes = BITCOIN_ALPHABET
+) -> bytes:
+    """
+    Encode a string using Base58
+    """
+    v = scrub_input(v)
+
+    nPad = len(v)
+    v = v.lstrip(b'\0')
+    nPad -= len(v)
+
+    p, acc = 1, 0
+    for c in reversed(v):
+        acc += p * c
+        p = p << 8
+    result = b58encode_int(acc, default_one=False, alphabet=alphabet)
+    return alphabet[0:1] * nPad + result
+
+
+def b58decode_int(
+    v: Union[str, bytes], alphabet: bytes = BITCOIN_ALPHABET
+) -> int:
+    """
+    Decode a Base58 encoded string as an integer
+    """
+    v = v.rstrip()
+    v = scrub_input(v)
+
+    decimal = 0
+    for char in v:
+        decimal = decimal * 58 + alphabet.index(char)
+    return decimal
+
+
+def b58decode(
+    v: Union[str, bytes], alphabet: bytes = BITCOIN_ALPHABET
+) -> bytes:
+    """
+    Decode a Base58 encoded string
+    """
+    v = v.rstrip()
+    v = scrub_input(v)
+
+    origlen = len(v)
+    v = v.lstrip(alphabet[0:1])
+    newlen = len(v)
+
+    acc = b58decode_int(v, alphabet=alphabet)
+
+    result = []
+    while acc > 0:
+        acc, mod = divmod(acc, 256)
+        result.append(mod)
+
+    return b'\0' * (origlen - newlen) + bytes(reversed(result))
+
+
+def b58encode_check(
+    v: Union[str, bytes], alphabet: bytes = BITCOIN_ALPHABET
+) -> bytes:
+    """
+    Encode a string using Base58 with a 4 character checksum
+    """
+    v = scrub_input(v)
+
+    digest = sha256(sha256(v).digest()).digest()
+    return b58encode(v + digest[:4], alphabet=alphabet)
+
+
+def b58decode_check(
+    v: Union[str, bytes], alphabet: bytes = BITCOIN_ALPHABET
+) -> bytes:
+    '''Decode and verify the checksum of a Base58 encoded string'''
+
+    result = b58decode(v, alphabet=alphabet)
+    result, check = result[:-4], result[-4:]
+    digest = sha256(sha256(result).digest()).digest()
+
+    if check != digest[:4]:
+        raise ValueError("Invalid checksum")
+
+    return result
-- 
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