def _decode_authority_key_identifier(backend, akid):
akid = backend._ffi.cast("AUTHORITY_KEYID *", akid)
akid = backend._ffi.gc(akid, backend._lib.AUTHORITY_KEYID_free)
key_identifier = None
authority_cert_issuer = None
authority_cert_serial_number = None
if akid.keyid != backend._ffi.NULL:
key_identifier = backend._ffi.buffer(
akid.keyid.data, akid.keyid.length
)[:]
if akid.issuer != backend._ffi.NULL:
authority_cert_issuer = _decode_general_names(
backend, akid.issuer
)
if akid.serial != backend._ffi.NULL:
authority_cert_serial_number = backend._asn1_integer_to_int(
akid.serial
)
return x509.AuthorityKeyIdentifier(
key_identifier, authority_cert_issuer, authority_cert_serial_number
)
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