2020-02-14 02:56:05 +00:00
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## Nim-Libp2p
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## Copyright (c) 2020 Status Research & Development GmbH
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## Licensed under either of
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## * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE))
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## * MIT license ([LICENSE-MIT](LICENSE-MIT))
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## at your option.
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## This file may not be copied, modified, or distributed except according to
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## those terms.
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## This module integrates BearSSL ChaCha20+Poly1305
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##
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## This module uses unmodified parts of code from
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## BearSSL library <https://bearssl.org/>
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## Copyright(C) 2018 Thomas Pornin <pornin@bolet.org>.
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# RFC @ https://tools.ietf.org/html/rfc7748
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import bearssl
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const
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Curve25519KeySize = 32
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type
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Curve25519* = object
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Curve25519Key* = array[Curve25519KeySize, byte]
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pcuchar = ptr cuchar
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const
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ForbiddenCurveValues: array[12, Curve25519Key] = [
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[0.byte, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
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[1.byte, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
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[224.byte, 235, 122, 124, 59, 65, 184, 174, 22, 86, 227, 250, 241, 159, 196, 106, 218, 9, 141, 235, 156, 50, 177, 253, 134, 98, 5, 22, 95, 73, 184, 0],
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[95.byte, 156, 149, 188, 163, 80, 140, 36, 177, 208, 177, 85, 156, 131, 239, 91, 4, 68, 92, 196, 88, 28, 142, 134, 216, 34, 78, 221, 208, 159, 17, 87],
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[236.byte, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 127],
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[237.byte, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 127],
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[238.byte, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 127],
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[205.byte, 235, 122, 124, 59, 65, 184, 174, 22, 86, 227, 250, 241, 159, 196, 106, 218, 9, 141, 235, 156, 50, 177, 253, 134, 98, 5, 22, 95, 73, 184, 128],
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[76.byte, 156, 149, 188, 163, 80, 140, 36, 177, 208, 177, 85, 156, 131, 239, 91, 4, 68, 92, 196, 88, 28, 142, 134, 216, 34, 78, 221, 208, 159, 17, 215],
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[217.byte, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255],
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[218.byte, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255],
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[219.byte, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 25],
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]
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let defaultBrEc = brEcGetDefault()
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proc mul*(_: type[Curve25519], dst: var Curve25519Key, scalar: Curve25519Key, point: Curve25519Key) =
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# The source point is provided in array G (of size Glen bytes);
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# the multiplication result is written over it.
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dst = scalar
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let
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res = defaultBrEc.mul(
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cast[pcuchar](addr dst[0]),
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Curve25519KeySize,
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cast[pcuchar](unsafeAddr point[0]),
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Curve25519KeySize,
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EC_curve25519.cint)
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assert res == 1
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proc mulgen*(_: type[Curve25519], dst: var Curve25519Key, scalar: Curve25519Key) =
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2020-02-14 03:16:21 +00:00
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block iterate:
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while true:
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block derive:
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let
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size = defaultBrEc.mulgen(
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cast[pcuchar](addr dst[0]),
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cast[pcuchar](unsafeAddr scalar[0]),
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Curve25519KeySize,
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EC_curve25519.cint)
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assert size == Curve25519KeySize
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for forbid in ForbiddenCurveValues:
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if dst == forbid:
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break derive
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break iterate
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2020-02-14 02:56:05 +00:00
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when isMainModule:
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var
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key: Curve25519Key
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dst: Curve25519Key
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dst2: Curve25519Key
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Curve25519.mulgen(dst, key)
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echo dst
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Curve25519.mul(dst2, dst, key)
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echo dst2
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