Rename 'test_get_pk2' to 'test_get_eth2_pk' and use rather ETH2 public address

tests/ragger/staking_deposit/key_handling/key_derivation/path.py

@@ -0,0 +1,40 @@
+from typing import List
+
+from bip_utils import Bip39SeedGenerator
+from bip_utils.utils.mnemonic import Mnemonic
+
+from .tree import (
+    derive_master_SK,
+    derive_child_SK,
+)
+
+
+def path_to_nodes(path: str) -> List[int]:
+    """
+    Maps from a path string to a list of indices where each index represents the corresponding level in the path.
+    """
+    path = path.replace(' ', '')
+    if not set(path).issubset(set('m1234567890/')):
+        raise ValueError(f"Invalid path {path}")
+
+    indices = path.split('/')
+
+    if indices[0] != 'm':
+        raise ValueError(f"The first character of path should be `m`. Got {indices[0]}.")
+    indices.pop(0)
+
+    return [int(index) for index in indices]
+
+
+def mnemonic_and_path_to_key(mnemonic: str, path: str) -> int:
+    """
+    Return the SK at position `path`, derived from `mnemonic`. The password is to be
+    compliant with BIP39 mnemonics that use passwords, but is not used by this CLI outside of tests.
+    """
+    #seed = get_seed(mnemonic)
+    seed = Bip39SeedGenerator(Mnemonic.FromString(mnemonic)).Generate()
+
+    sk = derive_master_SK(seed)
+    for node in path_to_nodes(path):
+        sk = derive_child_SK(parent_SK=sk, index=node)
+    return sk