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# This file is dual licensed under the terms of the Apache License, Version
# 2.0, and the BSD License. See the LICENSE file in the root of this repository
# for complete details.


from cryptography import utils
from cryptography.exceptions import (
    AlreadyFinalized,
    UnsupportedAlgorithm,
    _Reasons,
)


class Poly1305(object):
    def __init__(self, key: bytes):
        from cryptography.hazmat.backends.openssl.backend import backend

        if not backend.poly1305_supported():
            raise UnsupportedAlgorithm(
                "poly1305 is not supported by this version of OpenSSL.",
                _Reasons.UNSUPPORTED_MAC,
            )
        self._ctx = backend.create_poly1305_ctx(key)

    def update(self, data: bytes) -> None:
        if self._ctx is None:
            raise AlreadyFinalized("Context was already finalized.")
        utils._check_byteslike("data", data)
        self._ctx.update(data)

    def finalize(self) -> bytes:
        if self._ctx is None:
            raise AlreadyFinalized("Context was already finalized.")
        mac = self._ctx.finalize()
        self._ctx = None
        return mac

    def verify(self, tag: bytes) -> None:
        utils._check_bytes("tag", tag)
        if self._ctx is None:
            raise AlreadyFinalized("Context was already finalized.")

        ctx, self._ctx = self._ctx, None
        ctx.verify(tag)

    @classmethod
    def generate_tag(cls, key: bytes, data: bytes) -> bytes:
        p = Poly1305(key)
        p.update(data)
        return p.finalize()

    @classmethod
    def verify_tag(cls, key: bytes, data: bytes, tag: bytes) -> None:
        p = Poly1305(key)
        p.update(data)
        p.verify(tag)