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"""Signer utils for internal use."""
from __future__ import annotations
import hashlib
from typing import Any
from securesystemslib.exceptions import FormatError
from securesystemslib.formats import encode_canonical
def compute_default_keyid(keytype: str, scheme: str, keyval: dict[str, Any]) -> str:
"""Return sha256 hexdigest of the canonical json of the key."""
data: str | None = encode_canonical(
{
"keytype": keytype,
"scheme": scheme,
"keyval": keyval,
}
)
if isinstance(data, str):
byte_data: bytes = data.encode("utf-8")
else:
raise FormatError("Failed to encode data into canonical json")
return hashlib.sha256(byte_data).hexdigest()
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