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Add Curve25519 (BearSSL) required operations for noise

This commit is contained in:
Giovanni Petrantoni 2020-02-14 11:56:05 +09:00 committed by Dmitriy Ryajov
parent 71998ffc67
commit 8dec368878
2 changed files with 83 additions and 1 deletions
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2
libp2p/crypto/chacha20poly1305.nim
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@ -23,7 +23,7 @@ const
ChaChaPolyTagSize = 16
type
ChaChaPoly = object
ChaChaPoly* = object
ChaChaPolyKey* = array[ChaChaPolyKeySize, byte]
ChaChaPolyNonce* = array[ChaChaPolyNonceSize, byte]
ChaChaPolyTag* = array[ChaChaPolyTagSize, byte]

82
libp2p/crypto/curve25519.nim Normal file
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@ -0,0 +1,82 @@
## Nim-Libp2p
## Copyright (c) 2020 Status Research & Development GmbH
## Licensed under either of
## * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE))
## * MIT license ([LICENSE-MIT](LICENSE-MIT))
## at your option.
## This file may not be copied, modified, or distributed except according to
## those terms.
## This module integrates BearSSL ChaCha20+Poly1305
##
## This module uses unmodified parts of code from
## BearSSL library <https://bearssl.org/>
## Copyright(C) 2018 Thomas Pornin <pornin@bolet.org>.
# RFC @ https://tools.ietf.org/html/rfc7748
import bearssl
const
Curve25519KeySize = 32
type
Curve25519* = object
Curve25519Key* = array[Curve25519KeySize, byte]
pcuchar = ptr cuchar
const
ForbiddenCurveValues: array[12, Curve25519Key] = [
[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],
[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],
[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],
[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],
[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],
[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],
[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],
[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],
[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],
[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],
[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],
[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],
]
let defaultBrEc = brEcGetDefault()
proc mul*(_: type[Curve25519], dst: var Curve25519Key, scalar: Curve25519Key, point: Curve25519Key) =
# The source point is provided in array G (of size Glen bytes);
# the multiplication result is written over it.
dst = scalar
let
res = defaultBrEc.mul(
cast[pcuchar](addr dst[0]),
Curve25519KeySize,
cast[pcuchar](unsafeAddr point[0]),
Curve25519KeySize,
EC_curve25519.cint)
assert res == 1
proc mulgen*(_: type[Curve25519], dst: var Curve25519Key, scalar: Curve25519Key) =
while true:
let
size = defaultBrEc.mulgen(
cast[pcuchar](addr dst[0]),
cast[pcuchar](unsafeAddr scalar[0]),
Curve25519KeySize,
EC_curve25519.cint)
assert size == Curve25519KeySize
for forbid in ForbiddenCurveValues:
if dst == forbid:
continue
break
when isMainModule:
var
key: Curve25519Key
dst: Curve25519Key
dst2: Curve25519Key
Curve25519.mulgen(dst, key)
echo dst
Curve25519.mul(dst2, dst, key)
echo dst2