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Inline ChaCha20 32-byte specific constants

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This commit is contained in:
Pieter Wuille
2022-09-21 18:01:57 -04:00
parent 62ec713961
commit 93aee8bbda
3 changed files with 71 additions and 84 deletions
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15
src/test/fuzz/crypto_diff_fuzz_chacha20.cpp
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@@ -267,24 +267,25 @@ void ECRYPT_keystream_bytes(ECRYPT_ctx* x, u8* stream, u32 bytes)
FUZZ_TARGET(crypto_diff_fuzz_chacha20)
{
static const unsigned char ZEROKEY[32] = {0};
FuzzedDataProvider fuzzed_data_provider{buffer.data(), buffer.size()};
ChaCha20 chacha20;
ECRYPT_ctx ctx;
// D. J. Bernstein doesn't initialise ctx to 0 while Bitcoin Core initialises chacha20 to 0 in the constructor
for (int i = 0; i < 16; i++) {
ctx.input[i] = 0;
}
if (fuzzed_data_provider.ConsumeBool()) {
const std::vector<unsigned char> key = ConsumeFixedLengthByteVector(fuzzed_data_provider, 32);
chacha20 = ChaCha20{key.data()};
ECRYPT_keysetup(&ctx, key.data(), key.size() * 8, 0);
// ECRYPT_keysetup() doesn't set the counter and nonce to 0 while SetKey32() does
uint8_t iv[8] = {0, 0, 0, 0, 0, 0, 0, 0};
ECRYPT_ivsetup(&ctx, iv);
} else {
// The default ChaCha20 constructor is equivalent to using the all-0 key.
ECRYPT_keysetup(&ctx, ZEROKEY, 256, 0);
}
// ECRYPT_keysetup() doesn't set the counter and nonce to 0 while SetKey32() does
static const uint8_t iv[8] = {0, 0, 0, 0, 0, 0, 0, 0};
ECRYPT_ivsetup(&ctx, iv);
LIMITED_WHILE (fuzzed_data_provider.ConsumeBool(), 3000) {
CallOneOf(
fuzzed_data_provider,