Update ERC-7627: change to external

Merged by EIP-Bot.

ERCS/erc-7627.md

@@ -111,19 +111,19 @@ contract ERC7627 {
     event PublicKeyUpdated(address indexed user, bytes newPublicKey, PublicKeyAlgorithm algorithm);
 
     // Function to register a user with their public key
-    function updatePublicKey(bytes calldata _publicKey, PublicKeyAlgorithm _algorithm) public {
+    function updatePublicKey(bytes calldata _publicKey, PublicKeyAlgorithm _algorithm) external {
         pk[msg.sender].publicKey = _publicKey;
         pk[msg.sender].algorithm = _algorithm;
         emit PublicKeyUpdated(msg.sender, _publicKey, _algorithm);
     }
 
     // Function to send an encrypted message from one user to another
-    function sendMessage(address _to, bytes32 _sessionId, bytes calldata _encryptedMessage) public {
+    function sendMessage(address _to, bytes32 _sessionId, bytes calldata _encryptedMessage) external {
         emit MessageSent(msg.sender, _to, _sessionId, _encryptedMessage);
     }
 
     // Function to retrieve a user's public key
-    function getUserPublicKey(address _user) public view returns (bytes memory, PublicKeyAlgorithm) {
+    function getUserPublicKey(address _user) external view returns (bytes memory, PublicKeyAlgorithm) {
         UserInfo memory userInfo = pk[_user];
         return (userInfo.publicKey, userInfo.algorithm);
     }