refactor: 将 DTLS 本地依赖迁移到 libs 目录

libs/dtls/src/lib.rs

@@ -0,0 +1,58 @@
+#![warn(rust_2018_idioms)]
+#![allow(dead_code)]
+
+pub mod alert;
+pub mod application_data;
+pub mod certificate_verifier;
+pub mod change_cipher_spec;
+pub mod cipher_suite;
+pub mod client_certificate_type;
+pub mod compression_methods;
+pub mod config;
+pub mod conn;
+pub mod content;
+pub mod crypto;
+pub mod curve;
+mod error;
+pub mod extension;
+pub mod flight;
+pub mod fragment_buffer;
+pub mod handshake;
+pub mod handshaker;
+pub mod listener;
+pub mod prf;
+pub mod record_layer;
+pub mod signature_hash_algorithm;
+pub mod state;
+
+use cipher_suite::*;
+pub use error::Error;
+use extension::extension_use_srtp::SrtpProtectionProfile;
+
+pub(crate) fn find_matching_srtp_profile(
+    a: &[SrtpProtectionProfile],
+    b: &[SrtpProtectionProfile],
+) -> Result<SrtpProtectionProfile, ()> {
+    for a_profile in a {
+        for b_profile in b {
+            if a_profile == b_profile {
+                return Ok(*a_profile);
+            }
+        }
+    }
+    Err(())
+}
+
+pub(crate) fn find_matching_cipher_suite(
+    a: &[CipherSuiteId],
+    b: &[CipherSuiteId],
+) -> Result<CipherSuiteId, ()> {
+    for a_suite in a {
+        for b_suite in b {
+            if a_suite == b_suite {
+                return Ok(*a_suite);
+            }
+        }
+    }
+    Err(())
+}