From a5682357e39b9e2e82c5839f3f9828030d91c34c Mon Sep 17 00:00:00 2001
From: sumanjeet0012 <sumanjeet0012@gmail.com>
Date: Sun, 12 Jul 2026 22:13:35 +0530
Subject: [PATCH 1/3] Support complete multihash type mappings in Prefix

---
 cid/prefix.py | 39 +++++++++++----------------------------
 1 file changed, 11 insertions(+), 28 deletions(-)

diff --git a/cid/prefix.py b/cid/prefix.py
index 8ff42a1..a8a2328 100644
--- a/cid/prefix.py
+++ b/cid/prefix.py
@@ -215,40 +215,23 @@ def from_bytes(cls, data: bytes) -> "Prefix":
     @staticmethod
     def _mh_type_to_code(mh_type: str) -> int:
         """Convert multihash type name to code."""
-        # Common multihash type codes
-        # These match the multiformats specification
-        mh_codes = {
-            "sha1": 0x11,
-            "sha2-256": 0x12,
-            "sha2-512": 0x13,
-            "sha3-224": 0x17,
-            "sha3-256": 0x16,
-            "sha3-512": 0x14,
-            "blake2b-256": 0xB220,
-            "blake2b-512": 0xB240,
-        }
-        if mh_type not in mh_codes:
-            msg = f"Unknown multihash type: {mh_type}"
-            raise ValueError(msg)
-        return mh_codes[mh_type]
+        try:
+            return multihash.Func[mh_type.replace("-", "_")].value
+        except KeyError:
+            try:
+                return multihash.coerce_code(mh_type)
+            except (ValueError, TypeError):
+                msg = f"Unknown multihash type: {mh_type}"
+                raise ValueError(msg)
 
     @staticmethod
     def _mh_code_to_type(mh_code: int) -> str:
         """Convert multihash code to type name."""
-        mh_types = {
-            0x11: "sha1",
-            0x12: "sha2-256",
-            0x13: "sha2-512",
-            0x17: "sha3-224",
-            0x16: "sha3-256",
-            0x14: "sha3-512",
-            0xB220: "blake2b-256",
-            0xB240: "blake2b-512",
-        }
-        if mh_code not in mh_types:
+        try:
+            return multihash.Func(mh_code).name.replace("_", "-")
+        except ValueError:
             msg = f"Unknown multihash code: {mh_code}"
             raise ValueError(msg)
-        return mh_types[mh_code]
 
     def __eq__(self, other: object) -> bool:
         """Check equality with another Prefix."""

From 7d07d6c72cb26e6c340d246d70b54a66dbeb116e Mon Sep 17 00:00:00 2001
From: sumanjeet0012 <sumanjeet0012@gmail.com>
Date: Mon, 13 Jul 2026 00:20:18 +0530
Subject: [PATCH 2/3] added newsfragment

---
 newsfragments/65.bugfix.rst | 1 +
 1 file changed, 1 insertion(+)
 create mode 100644 newsfragments/65.bugfix.rst

diff --git a/newsfragments/65.bugfix.rst b/newsfragments/65.bugfix.rst
new file mode 100644
index 0000000..b18ddbc
--- /dev/null
+++ b/newsfragments/65.bugfix.rst
@@ -0,0 +1 @@
+Delegate multihash type mappings in Prefix to the multihash library.

From ee90a9bf351278b46f319e111d8dba9dfce5d5c6 Mon Sep 17 00:00:00 2001
From: sumanjeet0012 <sumanjeet0012@gmail.com>
Date: Mon, 13 Jul 2026 19:38:15 +0530
Subject: [PATCH 3/3] Fix typechecker lint errors

---
 cid/prefix.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/cid/prefix.py b/cid/prefix.py
index a8a2328..77efda3 100644
--- a/cid/prefix.py
+++ b/cid/prefix.py
@@ -216,10 +216,10 @@ def from_bytes(cls, data: bytes) -> "Prefix":
     def _mh_type_to_code(mh_type: str) -> int:
         """Convert multihash type name to code."""
         try:
-            return multihash.Func[mh_type.replace("-", "_")].value
+            return multihash.Func[mh_type.replace("-", "_")].value  # type: ignore
         except KeyError:
             try:
-                return multihash.coerce_code(mh_type)
+                return int(multihash.coerce_code(mh_type))  # type: ignore
             except (ValueError, TypeError):
                 msg = f"Unknown multihash type: {mh_type}"
                 raise ValueError(msg)