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Make unrestricted ChaCha20 cipher not waste keystream bytes

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Co-authored-by: dhruv <856960+dhruv@users.noreply.github.com>
This commit is contained in:
Pieter Wuille
2022-09-21 16:42:19 -04:00
parent 6babf40213
commit 12ff72476a
4 changed files with 60 additions and 9 deletions
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18
src/test/crypto_tests.cpp
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@@ -500,6 +500,24 @@ BOOST_AUTO_TEST_CASE(chacha20_testvector)
"fab78c9");
}
BOOST_AUTO_TEST_CASE(chacha20_midblock)
{
auto key = ParseHex("0000000000000000000000000000000000000000000000000000000000000000");
ChaCha20 c20{key.data(), 32};
// get one block of keystream
unsigned char block[64];
c20.Keystream(block, CHACHA20_ROUND_OUTPUT);
unsigned char b1[5], b2[7], b3[52];
c20 = ChaCha20{key.data(), 32};
c20.Keystream(b1, 5);
c20.Keystream(b2, 7);
c20.Keystream(b3, 52);
BOOST_CHECK_EQUAL(0, memcmp(b1, block, 5));
BOOST_CHECK_EQUAL(0, memcmp(b2, block + 5, 7));
BOOST_CHECK_EQUAL(0, memcmp(b3, block + 12, 52));
}
BOOST_AUTO_TEST_CASE(poly1305_testvector)
{
// RFC 7539, section 2.5.2.