106 lines
2.3 KiB
Python
106 lines
2.3 KiB
Python
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import six
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from lbryschema.schema import ADDRESS_CHECKSUM_LENGTH
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from lbryschema.hashing import double_sha256
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from lbryschema.error import InvalidAddress
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alphabet = b'123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz'
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if six.PY2:
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iseq, bseq, buffer = (
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lambda s: map(ord, s),
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lambda s: ''.join(map(chr, s)),
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lambda s: s,
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)
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elif six.PY3:
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iseq, bseq, buffer = (
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lambda s: s,
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bytes,
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lambda s: s.buffer,
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)
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def scrub_input(v):
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if isinstance(v, str) and not isinstance(v, bytes):
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v = v.encode('ascii')
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return v
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def b58encode_int(i, default_one=True):
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'''Encode an integer using Base58'''
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if not i and default_one:
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return alphabet[0:1]
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string = b""
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while i:
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i, idx = divmod(i, 58)
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string = alphabet[idx:idx+1] + string
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return string
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def b58encode(v):
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'''Encode a string using Base58'''
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v = scrub_input(v)
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nPad = len(v)
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v = v.lstrip(b'\0')
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nPad -= len(v)
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p, acc = 1, 0
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for c in iseq(reversed(v)):
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acc += p * c
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p = p << 8
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result = b58encode_int(acc, default_one=False)
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return alphabet[0:1] * nPad + result
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def b58decode_int(v):
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'''Decode a Base58 encoded string as an integer'''
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v = scrub_input(v)
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decimal = 0
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for char in v:
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decimal = decimal * 58 + alphabet.index(char)
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return decimal
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def b58decode(v):
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'''Decode a Base58 encoded string'''
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v = scrub_input(v)
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origlen = len(v)
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v = v.lstrip(alphabet[0:1])
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newlen = len(v)
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acc = b58decode_int(v)
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result = []
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while acc > 0:
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acc, mod = divmod(acc, 256)
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result.append(mod)
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return (b'\0' * (origlen - newlen) + bseq(reversed(result)))
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def validate_b58_checksum(addr_bytes):
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addr_without_checksum = addr_bytes[:-ADDRESS_CHECKSUM_LENGTH]
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addr_checksum = addr_bytes[-ADDRESS_CHECKSUM_LENGTH:]
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if double_sha256(addr_without_checksum)[:ADDRESS_CHECKSUM_LENGTH] != addr_checksum:
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raise InvalidAddress("Invalid address checksum")
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def b58decode_strip_checksum(v):
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addr_bytes = b58decode(v)
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validate_b58_checksum(addr_bytes)
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return addr_bytes[:-ADDRESS_CHECKSUM_LENGTH]
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def b58encode_with_checksum(addr_bytes):
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addr_checksum = double_sha256(addr_bytes)[:ADDRESS_CHECKSUM_LENGTH]
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return b58encode(addr_bytes + addr_checksum)
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