Initial commit

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

src/extensions/extension_data/signature_algorithms_cert.rs

@@ -0,0 +1,34 @@
+use crate::buffer::CryptoBuffer;
+use crate::extensions::extension_data::signature_algorithms::SignatureScheme;
+
+use crate::ProtocolError;
+use crate::parse_buffer::{ParseBuffer, ParseError};
+
+use heapless::Vec;
+
+#[derive(Debug, Clone, PartialEq)]
+#[cfg_attr(feature = "defmt", derive(defmt::Format))]
+pub struct SignatureAlgorithmsCert<const N: usize> {
+    pub supported_signature_algorithms: Vec<SignatureScheme, N>,
+}
+
+impl<const N: usize> SignatureAlgorithmsCert<N> {
+    pub fn parse(buf: &mut ParseBuffer) -> Result<Self, ParseError> {
+        let data_length = buf.read_u16()? as usize;
+
+        Ok(Self {
+            supported_signature_algorithms: buf
+                .read_list::<_, N>(data_length, SignatureScheme::parse)?,
+        })
+    }
+
+    pub fn encode(&self, buf: &mut CryptoBuffer) -> Result<(), ProtocolError> {
+        buf.with_u16_length(|buf| {
+            for &a in &self.supported_signature_algorithms {
+                buf.push_u16(a.as_u16())
+                    .map_err(|_| ProtocolError::EncodeError)?;
+            }
+            Ok(())
+        })
+    }
+}