101 lines
2.7 KiB
Nim
101 lines
2.7 KiB
Nim
# Nim-Libp2p
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# Copyright (c) 2022 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/rfc7539
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when (NimMajor, NimMinor) < (1, 4):
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{.push raises: [Defect].}
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else:
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{.push raises: [].}
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import bearssl/blockx
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from stew/assign2 import assign
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from stew/ranges/ptr_arith import baseAddr
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const
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ChaChaPolyKeySize = 32
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ChaChaPolyNonceSize = 12
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ChaChaPolyTagSize = 16
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type
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ChaChaPoly* = object
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ChaChaPolyKey* = array[ChaChaPolyKeySize, byte]
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ChaChaPolyNonce* = array[ChaChaPolyNonceSize, byte]
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ChaChaPolyTag* = array[ChaChaPolyTagSize, byte]
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proc intoChaChaPolyKey*(s: openArray[byte]): ChaChaPolyKey =
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assert s.len == ChaChaPolyKeySize
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assign(result, s)
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proc intoChaChaPolyNonce*(s: openArray[byte]): ChaChaPolyNonce =
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assert s.len == ChaChaPolyNonceSize
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assign(result, s)
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proc intoChaChaPolyTag*(s: openArray[byte]): ChaChaPolyTag =
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assert s.len == ChaChaPolyTagSize
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assign(result, s)
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# bearssl allows us to use optimized versions
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# this is reconciled at runtime
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# we do this in the global scope / module init
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proc encrypt*(_: type[ChaChaPoly],
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key: ChaChaPolyKey,
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nonce: ChaChaPolyNonce,
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tag: var ChaChaPolyTag,
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data: var openArray[byte],
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aad: openArray[byte]) =
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let
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ad = if aad.len > 0:
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unsafeAddr aad[0]
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else:
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nil
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poly1305CtmulRun(
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unsafeAddr key[0],
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unsafeAddr nonce[0],
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baseAddr(data),
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uint(data.len),
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ad,
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uint(aad.len),
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baseAddr(tag),
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# cast is required to workaround https://github.com/nim-lang/Nim/issues/13905
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cast[Chacha20Run](chacha20CtRun),
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#[encrypt]# 1.cint)
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proc decrypt*(_: type[ChaChaPoly],
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key: ChaChaPolyKey,
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nonce: ChaChaPolyNonce,
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tag: var ChaChaPolyTag,
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data: var openArray[byte],
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aad: openArray[byte]) =
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let
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ad = if aad.len > 0:
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unsafeAddr aad[0]
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else:
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nil
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poly1305CtmulRun(
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unsafeAddr key[0],
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unsafeAddr nonce[0],
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baseAddr(data),
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uint(data.len),
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ad,
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uint(aad.len),
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baseAddr(tag),
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# cast is required to workaround https://github.com/nim-lang/Nim/issues/13905
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cast[Chacha20Run](chacha20CtRun),
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#[decrypt]# 0.cint)
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