fix(ext/tls): add support EC private key (#23261)

Deno works with the `EC` key, but cannot recognize it.
This code works correctly if the prefix 'EC' is removed.

```typescript
const cert = `-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----`
const key = `-----BEGIN EC PRIVATE KEY-----
MHcCAQEEILL8H0x2ZP/ZZ+CwmKLS/zRleO7k7NBgWH0P767zYvlVoAoGCCqGSM49
AwEHoUQDQgAE1jgC3IM8+C2zYpIY1RqZDglJkfDWoY3xcPaTQbsmZ2k3I33hn4j2
ldIkKr07kJ5i/n0wcPDysc5Shqc7KHUGlg==
-----END EC PRIVATE KEY-----`

const config: Deno.ServeTlsOptions = {
  cert,
  // key, // not working // error: Uncaught (in promise) InvalidData: No keys found in key file
  key: key.replaceAll(' EC', ''), // remove ' EC'. it works
}

Deno.serve(config, (r) => Response.json('ok'))
```

1 files changed, 11 insertions, 0 deletions

diff --git a/ext/tls/lib.rs b/ext/tls/lib.rs
index 9ed8a5a1f..be8cabadc 100644
--- a/ext/tls/lib.rs
+++ b/ext/tls/lib.rs
@@ -23,6 +23,7 @@ use rustls::PrivateKey;
 use rustls::RootCertStore;
 use rustls::ServerName;
 use rustls_pemfile::certs;
+use rustls_pemfile::ec_private_keys;
 use rustls_pemfile::pkcs8_private_keys;
 use rustls_pemfile::rsa_private_keys;
 use serde::Deserialize;
@@ -290,6 +291,12 @@ fn load_rsa_keys(mut bytes: &[u8]) -> Result<Vec<PrivateKey>, AnyError> {
   Ok(keys.into_iter().map(PrivateKey).collect())
 }
 
+/// Starts with -----BEGIN EC PRIVATE KEY-----
+fn load_ec_keys(mut bytes: &[u8]) -> Result<Vec<PrivateKey>, AnyError> {
+  let keys = ec_private_keys(&mut bytes).map_err(|_| key_decode_err())?;
+  Ok(keys.into_iter().map(PrivateKey).collect())
+}
+
 /// Starts with -----BEGIN PRIVATE KEY-----
 fn load_pkcs8_keys(mut bytes: &[u8]) -> Result<Vec<PrivateKey>, AnyError> {
   let keys = pkcs8_private_keys(&mut bytes).map_err(|_| key_decode_err())?;
@@ -315,6 +322,10 @@ pub fn load_private_keys(bytes: &[u8]) -> Result<Vec<PrivateKey>, AnyError> {
   }
 
   if keys.is_empty() {
+    keys = load_ec_keys(bytes)?;
+  }
+
+  if keys.is_empty() {
     return Err(key_not_found_err());
   }