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Squashed 'src/secp256k1/' changes from efe85c70a2..c541071488
c541071488 [DEMO-ONLY] add bip352 test vectors running suite using python and ctypes 43bdfc38b6 test: add simple BIP-352 test with mixed plain/taproot inputs dfebed1497 silentpayments: implement output spending privkey creation (for receiver) 8e498919b0 silentpayments: add routine for creating scanning data (for receiver) 201d2a9846 silentpayments: implement output pubkey creation (for sender) 655a0523ae silentpayments: add routine for creating labelled spend pubkeys (for addresses) 718d026e50 silentpayments: add label tweak calculation routine 26714a9b40 silentpayments: add shared secret creation routine (a*B == A*b) 98f5ba4aa6 silentpayments: add public tweak data creation routine 81d13038d5 silentpayments: add private tweak data creation routine 6e3ed2d5df doc: add module description for secp256k1-silentpayments a9a5fe8e28 build: add skeleton for new silentpayments (BIP352) module 2483627299 Merge bitcoin-core/secp256k1#1483: cmake: Recommend native CMake commands in README 5ad3aa3dcd Merge bitcoin-core/secp256k1#1484: tests: Drop redundant _scalar_check_overflow calls 51df2d9ab3 tests: Drop redundant _scalar_check_overflow calls 3777e3f36a cmake: Recommend native CMake commands in README e4af41c61b Merge bitcoin-core/secp256k1#1249: cmake: Add `SECP256K1_LATE_CFLAGS` configure option 3bf4d68fc0 Merge bitcoin-core/secp256k1#1482: build: Clean up handling of module dependencies e6822678ea build: Error if required module explicitly off 89ec583ccf build: Clean up handling of module dependencies 44378867a0 Merge bitcoin-core/secp256k1#1468: v0.4.1 release aftermath a9db9f2d75 Merge bitcoin-core/secp256k1#1480: Get rid of untested sizeof(secp256k1_ge_storage) == 64 code path 74b7c3b53e Merge bitcoin-core/secp256k1#1476: include: make docs more consistent b37fdb28ce check-abi: Minor UI improvements ad5f589a94 check-abi: Default to HEAD for new version 9fb7e2f156 release process: Style and formatting nits ba5d72d626 assumptions: Use new STATIC_ASSERT macro e53c2d9ffc Require that sizeof(secp256k1_ge_storage) == 64 d0ba2abbff util: Add STATIC_ASSERT macro da7bc1b803 include: in doc, remove article in front of "pointer" aa3dd5280b include: make doc about ctx more consistent e3f690015a include: remove obvious "cannot be NULL" doc d373bf6d08 Merge bitcoin-core/secp256k1#1474: tests: restore scalar_mul test 79e094517c Merge bitcoin-core/secp256k1#1473: Fix typos 3dbfb48946 tests: restore scalar_mul test d77170a88d Fix typos e7053d065b release process: Add email step 429d21dc79 release process: Run sanity checks on release PR 42f8c51402 cmake: Add `SECP256K1_LATE_CFLAGS` configure option git-subtree-dir: src/secp256k1 git-subtree-split: c541071488c8132e5897e3eb74b010fc80a74b85
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| Original file line number | Diff line number | Diff line change |
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| # Copyright (c) 2017, 2020 Pieter Wuille | ||
| # | ||
| # Permission is hereby granted, free of charge, to any person obtaining a copy | ||
| # of this software and associated documentation files (the "Software"), to deal | ||
| # in the Software without restriction, including without limitation the rights | ||
| # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | ||
| # copies of the Software, and to permit persons to whom the Software is | ||
| # furnished to do so, subject to the following conditions: | ||
| # | ||
| # The above copyright notice and this permission notice shall be included in | ||
| # all copies or substantial portions of the Software. | ||
| # | ||
| # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
| # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | ||
| # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | ||
| # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | ||
| # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | ||
| # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | ||
| # THE SOFTWARE. | ||
|
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| """Reference implementation for Bech32/Bech32m and segwit addresses.""" | ||
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| from enum import Enum | ||
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| class Encoding(Enum): | ||
| """Enumeration type to list the various supported encodings.""" | ||
| BECH32 = 1 | ||
| BECH32M = 2 | ||
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| CHARSET = "qpzry9x8gf2tvdw0s3jn54khce6mua7l" | ||
| BECH32M_CONST = 0x2bc830a3 | ||
|
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| def bech32_polymod(values): | ||
| """Internal function that computes the Bech32 checksum.""" | ||
| generator = [0x3b6a57b2, 0x26508e6d, 0x1ea119fa, 0x3d4233dd, 0x2a1462b3] | ||
| chk = 1 | ||
| for value in values: | ||
| top = chk >> 25 | ||
| chk = (chk & 0x1ffffff) << 5 ^ value | ||
| for i in range(5): | ||
| chk ^= generator[i] if ((top >> i) & 1) else 0 | ||
| return chk | ||
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| def bech32_hrp_expand(hrp): | ||
| """Expand the HRP into values for checksum computation.""" | ||
| return [ord(x) >> 5 for x in hrp] + [0] + [ord(x) & 31 for x in hrp] | ||
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| def bech32_verify_checksum(hrp, data): | ||
| """Verify a checksum given HRP and converted data characters.""" | ||
| const = bech32_polymod(bech32_hrp_expand(hrp) + data) | ||
| if const == 1: | ||
| return Encoding.BECH32 | ||
| if const == BECH32M_CONST: | ||
| return Encoding.BECH32M | ||
| return None | ||
|
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| def bech32_create_checksum(hrp, data, spec): | ||
| """Compute the checksum values given HRP and data.""" | ||
| values = bech32_hrp_expand(hrp) + data | ||
| const = BECH32M_CONST if spec == Encoding.BECH32M else 1 | ||
| polymod = bech32_polymod(values + [0, 0, 0, 0, 0, 0]) ^ const | ||
| return [(polymod >> 5 * (5 - i)) & 31 for i in range(6)] | ||
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| def bech32_encode(hrp, data, spec): | ||
| """Compute a Bech32 string given HRP and data values.""" | ||
| combined = data + bech32_create_checksum(hrp, data, spec) | ||
| return hrp + '1' + ''.join([CHARSET[d] for d in combined]) | ||
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| def bech32_decode(bech): | ||
| """Validate a Bech32/Bech32m string, and determine HRP and data.""" | ||
| if ((any(ord(x) < 33 or ord(x) > 126 for x in bech)) or | ||
| (bech.lower() != bech and bech.upper() != bech)): | ||
| return (None, None, None) | ||
| bech = bech.lower() | ||
| pos = bech.rfind('1') | ||
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| # remove the requirement that bech32m be less than 90 chars | ||
| if pos < 1 or pos + 7 > len(bech): | ||
| return (None, None, None) | ||
| if not all(x in CHARSET for x in bech[pos+1:]): | ||
| return (None, None, None) | ||
| hrp = bech[:pos] | ||
| data = [CHARSET.find(x) for x in bech[pos+1:]] | ||
| spec = bech32_verify_checksum(hrp, data) | ||
| if spec is None: | ||
| return (None, None, None) | ||
| return (hrp, data[:-6], spec) | ||
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| def convertbits(data, frombits, tobits, pad=True): | ||
| """General power-of-2 base conversion.""" | ||
| acc = 0 | ||
| bits = 0 | ||
| ret = [] | ||
| maxv = (1 << tobits) - 1 | ||
| max_acc = (1 << (frombits + tobits - 1)) - 1 | ||
| for value in data: | ||
| if value < 0 or (value >> frombits): | ||
| return None | ||
| acc = ((acc << frombits) | value) & max_acc | ||
| bits += frombits | ||
| while bits >= tobits: | ||
| bits -= tobits | ||
| ret.append((acc >> bits) & maxv) | ||
| if pad: | ||
| if bits: | ||
| ret.append((acc << (tobits - bits)) & maxv) | ||
| elif bits >= frombits or ((acc << (tobits - bits)) & maxv): | ||
| return None | ||
| return ret | ||
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| def decode(hrp, addr): | ||
| """Decode a segwit address.""" | ||
| hrpgot, data, spec = bech32_decode(addr) | ||
| if hrpgot != hrp: | ||
| return (None, None) | ||
| decoded = convertbits(data[1:], 5, 8, False) | ||
| if decoded is None or len(decoded) < 2: | ||
| return (None, None) | ||
| if data[0] > 16: | ||
| return (None, None) | ||
| return (data[0], decoded) | ||
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| def encode(hrp, witver, witprog): | ||
| """Encode a segwit address.""" | ||
| spec = Encoding.BECH32 if witver == 0 else Encoding.BECH32M | ||
| ret = bech32_encode(hrp, [witver] + convertbits(witprog, 8, 5), spec) | ||
| if decode(hrp, ret) == (None, None): | ||
| return None | ||
| return ret |
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