feat(ext/crypto): export elliptic keys as "raw" (#14764)

This commit adds support for the "raw" format when exporting public ECDH/ECDSA keys via
the SubtleCrypto.exportKey method.

2 files changed, 38 insertions, 0 deletions

diff --git a/ext/crypto/00_crypto.js b/ext/crypto/00_crypto.js
index c825089e7..2b14a204e 100644
--- a/ext/crypto/00_crypto.js
+++ b/ext/crypto/00_crypto.js
@@ -3433,6 +3433,24 @@
 
   function exportKeyEC(format, key, innerKey) {
     switch (format) {
+      case "raw": {
+        // 1.
+        if (key[_type] !== "public") {
+          throw new DOMException(
+            "Key is not a public key",
+            "InvalidAccessError",
+          );
+        }
+
+        // 2.
+        const data = core.opSync("op_crypto_export_key", {
+          algorithm: key[_algorithm].name,
+          namedCurve: key[_algorithm].namedCurve,
+          format: "raw",
+        }, innerKey);
+
+        return data.buffer;
+      }
       case "pkcs8": {
         // 1.
         if (key[_type] !== "private") {
diff --git a/ext/crypto/export_key.rs b/ext/crypto/export_key.rs
index 64d2d1079..9e124775b 100644
--- a/ext/crypto/export_key.rs
+++ b/ext/crypto/export_key.rs
@@ -25,6 +25,7 @@ pub struct ExportKeyOptions {
 #[derive(Deserialize)]
 #[serde(rename_all = "lowercase")]
 pub enum ExportKeyFormat {
+  Raw,
   Pkcs8,
   Spki,
   JwkPublic,
@@ -54,6 +55,7 @@ pub enum ExportKeyAlgorithm {
 #[derive(Serialize)]
 #[serde(untagged)]
 pub enum ExportKeyResult {
+  Raw(ZeroCopyBuf),
   Pkcs8(ZeroCopyBuf),
   Spki(ZeroCopyBuf),
   JwkSecret {
@@ -228,6 +230,24 @@ fn export_key_ec(
   named_curve: EcNamedCurve,
 ) -> Result<ExportKeyResult, deno_core::anyhow::Error> {
   match format {
+    ExportKeyFormat::Raw => {
+      let subject_public_key = match named_curve {
+        EcNamedCurve::P256 => {
+          let point = key_data.as_ec_public_key_p256()?;
+
+          point.as_ref().to_vec()
+        }
+        EcNamedCurve::P384 => {
+          let point = key_data.as_ec_public_key_p384()?;
+
+          point.as_ref().to_vec()
+        }
+        EcNamedCurve::P521 => {
+          return Err(data_error("Unsupported named curve"))
+        }
+      };
+      Ok(ExportKeyResult::Raw(subject_public_key.into()))
+    }
     ExportKeyFormat::Spki => {
       let subject_public_key = match named_curve {
         EcNamedCurve::P256 => {