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crypto: Implement RFC8439-compatible variant of ChaCha20

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There are two variants of ChaCha20 in use. The original one uses a 64-bit
nonce and a 64-bit block counter, while the one used in RFC8439 uses a
96-bit nonce and 32-bit block counter. This commit changes the interface
to use the 96/32 split (but automatically incrementing the first 32-bit
part of the nonce when the 32-bit block counter overflows, so to retain
compatibility with >256 GiB output).

Simultaneously, also merge the SetIV and Seek64 functions, as we almost
always call both anyway.

Co-authored-by: dhruv <856960+dhruv@users.noreply.github.com>
This commit is contained in:
Pieter Wuille
2023-06-27 16:24:02 -04:00
parent cf4da5ec29
commit 511a8d406e
7 changed files with 89 additions and 71 deletions
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3
src/bench/chacha20.cpp
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@@ -15,8 +15,7 @@ static void CHACHA20(benchmark::Bench& bench, size_t buffersize)
{
std::vector<uint8_t> key(32,0);
ChaCha20 ctx(key.data());
ctx.SetIV(0);
ctx.Seek64(0);
ctx.Seek64({0, 0}, 0);
std::vector<uint8_t> in(buffersize,0);
std::vector<uint8_t> out(buffersize,0);
bench.batch(in.size()).unit("byte").run([&] {