verifier/ipcc: use constant from libipcc (#345)

Author: luqmana

Cargo.lock

@@ -30,7 +30,7 @@ getrandom = "0.3.4"
 hex.version = "0.4"
 hubpack = "0.1"
 knuffel = "3.2.0"
-libipcc = { git = "https://github.com/oxidecomputer/ipcc-rs", rev = "dbaad520e1f5ae32c10db16ce176f9c24de95652" }
+libipcc = { git = "https://github.com/oxidecomputer/ipcc-rs", rev = "7cdf2ab9c8d9e9267a8b366aa780c6c26f9a5ecf" }
 log = { version = "0.4.28", features = ["std"] }
 # pin miette to same version used by knuffel
 miette = { version = "5.10", features = ["fancy"] }

Cargo.toml

@@ -7,19 +7,14 @@ use attest_data::{
     Attestation, Log, Nonce,
 };
 pub use libipcc::IpccError;
-use libipcc::IpccHandle;
+use libipcc::{IpccHandle, IPCC_MAX_DATA_SIZE};
 use x509_cert::{
     der::{self, Decode, Encode, Reader},
     Certificate, PkiPath,
 };
 
 use crate::{Attest, AttestError};
 
-// A slight hack. These are only defined right now in the `ffi` part
-// of libipcc which isn't available on non-illumos targets. Probably
-// indicates those constants belong elsewhere...
-const IPCC_MAX_DATA_SIZE: usize = 4123 - 19;
-
 /// The `AttestIpcc` type communicates with the RoT `Attest` task through the
 /// IPCC interface / <https://github.com/oxidecomputer/ipcc-rs>
 pub struct AttestIpcc {