adds a AssociatedHashingAlgorithm to bridge to rustcrypto

Signed-off-by: Arthur Gautier <[email protected]>

Author: baloo

tss-esapi/src/abstraction/hashing.rs

@@ -0,0 +1,50 @@
+// Copyright 2024 Contributors to the Parsec project.
+// SPDX-License-Identifier: Apache-2.0
+
+use crate::interface_types::algorithm::HashingAlgorithm;
+
+/// Provides the value of the digest used in this crate for the digest.
+pub trait AssociatedHashingAlgorithm {
+    /// Value of the digest when interacting with the TPM.
+    const TPM_DIGEST: HashingAlgorithm;
+}
+
+#[cfg(all(feature = "rustcrypto", feature = "sha1"))]
+impl AssociatedHashingAlgorithm for sha1::Sha1 {
+    const TPM_DIGEST: HashingAlgorithm = HashingAlgorithm::Sha1;
+}
+
+#[cfg(all(feature = "rustcrypto", feature = "sha2"))]
+impl AssociatedHashingAlgorithm for sha2::Sha256 {
+    const TPM_DIGEST: HashingAlgorithm = HashingAlgorithm::Sha256;
+}
+
+#[cfg(all(feature = "rustcrypto", feature = "sha2"))]
+impl AssociatedHashingAlgorithm for sha2::Sha384 {
+    const TPM_DIGEST: HashingAlgorithm = HashingAlgorithm::Sha384;
+}
+
+#[cfg(all(feature = "rustcrypto", feature = "sha2"))]
+impl AssociatedHashingAlgorithm for sha2::Sha512 {
+    const TPM_DIGEST: HashingAlgorithm = HashingAlgorithm::Sha512;
+}
+
+#[cfg(all(feature = "rustcrypto", feature = "sm3"))]
+impl AssociatedHashingAlgorithm for sm3::Sm3 {
+    const TPM_DIGEST: HashingAlgorithm = HashingAlgorithm::Sm3_256;
+}
+
+#[cfg(all(feature = "rustcrypto", feature = "sha3"))]
+impl AssociatedHashingAlgorithm for sha3::Sha3_256 {
+    const TPM_DIGEST: HashingAlgorithm = HashingAlgorithm::Sha3_256;
+}
+
+#[cfg(all(feature = "rustcrypto", feature = "sha3"))]
+impl AssociatedHashingAlgorithm for sha3::Sha3_384 {
+    const TPM_DIGEST: HashingAlgorithm = HashingAlgorithm::Sha3_384;
+}
+
+#[cfg(all(feature = "rustcrypto", feature = "sha3"))]
+impl AssociatedHashingAlgorithm for sha3::Sha3_512 {
+    const TPM_DIGEST: HashingAlgorithm = HashingAlgorithm::Sha3_512;
+}

tss-esapi/src/abstraction/mod.rs

@@ -9,6 +9,9 @@ pub mod pcr;
 pub mod public;
 pub mod transient;
 
+mod hashing;
+pub use hashing::AssociatedHashingAlgorithm;
+
 use std::convert::TryFrom;
 
 use crate::{