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Merge pull request #13697 from obsidiansystems/base64-trailing-test

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Base64 trailing test (from Snix, thanks)
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John Ericson 2025-08-06 13:13:17 -04:00 • committed by GitHub
commit c98af65da6
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src/libutil-tests/base-n.cc
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@ -65,4 +65,46 @@ TEST(base64Decode, decodeThrowsOnInvalidChar)
ASSERT_THROW(base64::decode("cXVvZCBlcm_0IGRlbW9uc3RyYW5kdW0="), Error);
}
// A SHA-512 hash. Hex encoded to be clearer / distinct from the Base64 test case.
const std::string expectedDecoded = base16::decode(
"ee0f754c1bd8a18428ad14eaa3ead80ff8b96275af5012e7a8384f1f10490da056eec9ae3cc791a7a13a24e16e54df5bccdd109c7d53a14534bbd7360a300b11");
struct Base64TrailingParseCase
{
std::string sri;
};
class Base64TrailParseTest : public ::testing::TestWithParam<Base64TrailingParseCase>
{};
TEST_P(Base64TrailParseTest, AcceptsVariousSha512Paddings)
{
auto sri = GetParam().sri;
auto decoded = base64::decode(sri);
EXPECT_EQ(decoded, expectedDecoded);
}
/* Nix's Base64 implementation has historically accepted trailing
garbage. We may want to warn about this in the future, but we cannot
take it away suddenly.
Test case taken from Snix:
https://git.snix.dev/snix/snix/src/commit/2a29b90c7f3f3c52b5bdae50260fb0bd903c6b38/snix/nix-compat/src/nixhash/mod.rs#L431
*/
INSTANTIATE_TEST_SUITE_P(
Sha512Paddings,
Base64TrailParseTest,
::testing::Values(
Base64TrailingParseCase{
"7g91TBvYoYQorRTqo+rYD/i5YnWvUBLnqDhPHxBJDaBW7smuPMeRp6E6JOFuVN9bzN0QnH1ToUU0u9c2CjALEQ"},
Base64TrailingParseCase{
"7g91TBvYoYQorRTqo+rYD/i5YnWvUBLnqDhPHxBJDaBW7smuPMeRp6E6JOFuVN9bzN0QnH1ToUU0u9c2CjALEQ="},
Base64TrailingParseCase{
"7g91TBvYoYQorRTqo+rYD/i5YnWvUBLnqDhPHxBJDaBW7smuPMeRp6E6JOFuVN9bzN0QnH1ToUU0u9c2CjALEQ=="},
Base64TrailingParseCase{
"7g91TBvYoYQorRTqo+rYD/i5YnWvUBLnqDhPHxBJDaBW7smuPMeRp6E6JOFuVN9bzN0QnH1ToUU0u9c2CjALEQ==="},
Base64TrailingParseCase{
"7g91TBvYoYQorRTqo+rYD/i5YnWvUBLnqDhPHxBJDaBW7smuPMeRp6E6JOFuVN9bzN0QnH1ToUU0u9c2CjALEQ== cheesecake"}));
} // namespace nix