Generate dummy mlkem bindings if mlkem.h is missing #471
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boring-sys/src/mlkem_dummy.rs
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| fn fail() { | ||
| unsafe { | ||
| ERR_put_error( |
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This only records an error, right? Doesn't halt the execution.
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Yeah. I've renamed it to just put_error.
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Shouldn't we panic and halt execution to prevent the thing you worried about?
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The void functions I'm worried about panic via unimplemented!(), which will halt the execution one way or another (unwind or abort). Other functions that can report errors do it in the normal way by pushing an error on the stack and returning a failure code (these functions are documented to return 1 on success and 0 otherwise). I wanted this to be most gracefully-degrading as possible.
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boring-sys/src/mlkem_dummy.rs
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| _seed: *const u8, | ||
| _seed_len: usize, | ||
| ) -> ::std::os::raw::c_int { | ||
| put_error(); |
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We should panic here too because MLKEM1024_private_key_from_seed doesn't error if you give it the right parameters and so an error check could be omitted.
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Sigh, another C API being one cut corner away from UB and vulnerabilities. I've slapped abort() on all of them.
boring-sys/src/mlkem_dummy.rs
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| _ciphertext_len: usize, | ||
| _private_key: *const MLKEM1024_private_key, | ||
| ) -> ::std::os::raw::c_int { | ||
| put_error(); |
boring-sys/src/mlkem_dummy.rs
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| _seed_len: usize, | ||
| ) -> ::std::os::raw::c_int { | ||
| put_error(); | ||
| 0 |
boring-sys/src/mlkem_dummy.rs
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| _private_key: *const MLKEM768_private_key, | ||
| ) -> ::std::os::raw::c_int { | ||
| put_error(); | ||
| 0 |
boring-sys/src/mlkem_dummy.rs
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| public_key: *const MLKEM768_public_key, | ||
| ) -> ::std::os::raw::c_int { | ||
| put_error(); | ||
| 0 |
boring-sys/src/mlkem_dummy.rs
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| public_key: *const MLKEM1024_public_key, | ||
| ) -> ::std::os::raw::c_int { | ||
| put_error(); | ||
| 0 |
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Includes #470
If C lacks MLKEM APIs, and the
mlkemCargo feature isn't requiring a real MLKEM support,boring-syswill inject an always-failing fallback to allow Rust bindings to fail at run time instead of compile time.It uses a glob to add the fallback, because Rust always prefers real definitions over globs, so the real definitions will be used if they're available.