[bssl] Add digest and hmac modules to libbssl

Bug: 301068421
Test: atest rialto_test
Change-Id: I1d61902b80cc71c554b1009e6e1c91401164e7cf
diff --git a/libs/bssl/src/lib.rs b/libs/bssl/src/lib.rs
index 85890ee..500419b 100644
--- a/libs/bssl/src/lib.rs
+++ b/libs/bssl/src/lib.rs
@@ -19,8 +19,11 @@
 extern crate alloc;
 
 mod cbb;
+mod digest;
 mod ec_key;
+mod hmac;
 
 pub use bssl_avf_error::{ApiName, Error, Result};
 pub use cbb::CbbFixed;
 pub use ec_key::{EcKey, ZVec};
+pub use hmac::hmac_sha256;