dev@locazia: add service healthy montoring

app/core/_crypto/signer.py

@@ -0,0 +1,29 @@
+from Crypto.PublicKey import ECC
+from Crypto.Hash import SHA256
+from Crypto.Signature import DSS
+import base58
+
+
+class Signer:
+    def __init__(self, seed: bytes):
+        if len(seed) != 32:
+            raise ValueError("Seed must be 32 bytes")
+
+        self.key = ECC.generate(curve='P-256', randfunc=lambda n: seed)
+        self.verifier = DSS.new(self.key, 'fips-186-3')
+
+    def sign(self, data_bytes: bytes) -> str:
+        hash_obj = SHA256.new(data_bytes)
+        signature = self.verifier.sign(hash_obj)
+        signature_str = base58.b58encode(signature).decode()
+        return signature_str
+
+    def verify(self, data_bytes: str, signature: str) -> bool:
+        data_bytes = base58.b58decode(data_bytes)
+        signature_bytes = base58.b58decode(signature)
+        hash_obj = SHA256.new(data_bytes)
+        try:
+            self.verifier.verify(hash_obj, signature_bytes)
+            return True
+        except ValueError:
+            return False