import base64

from cryptography.hazmat.primitives import serialization
from cryptography.hazmat.backends import default_backend


def pem_to_base64(pem: str, strip_padding: bool = True) -> str:
    public_key = serialization.load_pem_public_key(
        pem.encode("utf-8"),
        backend=default_backend()
    )
    raw_bytes = public_key.public_bytes(
        encoding=serialization.Encoding.Raw,
        format=serialization.PublicFormat.Raw
    )

    b64 = base64.b64encode(raw_bytes).decode('ascii')
    if strip_padding:
        b64 = b64.rstrip('=')
    return b64