import pure_blake3
# regular hashing
hasher1 = pure_blake3.Hasher()
hasher1.update(b"foobarbaz")
output1 = hasher1.finalize()
# regular hashing in multiple steps
hasher2 = pure_blake3.Hasher()
hasher2.update(b"foo")
hasher2.update(b"bar")
hasher2.update(b"baz")
output2 = hasher2.finalize()
assert output2 == output1
# extendable output
hasher3 = pure_blake3.Hasher()
hasher3.update(b"foobarbaz")
output3 = hasher3.finalize(100)
assert output3[:32] == output2
# keyed hashing
import secrets
random_key = secrets.token_bytes(32)
message = b"a message to authenticate"
keyed_hasher = pure_blake3.Hasher.new_keyed(random_key)
keyed_hasher.update(message)
mac = keyed_hasher.finalize()
# key derivation
context_string = "pure_blake3 2021-10-29 18:37:44 example context"
key_material = b"usually at least 32 random bytes, not a password"
kdf = pure_blake3.Hasher.new_derive_key(context_string)
kdf.update(key_material)
derived_key = kdf.finalize()