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| from Cryptodome.Util.py3compat import bord
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|
|
| from Cryptodome.Util._raw_api import (load_pycryptodome_raw_lib,
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| VoidPointer, SmartPointer,
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| create_string_buffer,
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| get_raw_buffer, c_size_t,
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| c_uint8_ptr, c_ubyte)
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|
|
| _raw_keccak_lib = load_pycryptodome_raw_lib("Cryptodome.Hash._keccak",
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| """
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| int keccak_init(void **state,
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| size_t capacity_bytes,
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| uint8_t rounds);
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| int keccak_destroy(void *state);
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| int keccak_absorb(void *state,
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| const uint8_t *in,
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| size_t len);
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| int keccak_squeeze(const void *state,
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| uint8_t *out,
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| size_t len,
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| uint8_t padding);
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| int keccak_digest(void *state,
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| uint8_t *digest,
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| size_t len,
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| uint8_t padding);
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| int keccak_copy(const void *src, void *dst);
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| int keccak_reset(void *state);
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| """)
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|
|
| class Keccak_Hash(object):
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| """A Keccak hash object.
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| Do not instantiate directly.
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| Use the :func:`new` function.
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|
|
| :ivar digest_size: the size in bytes of the resulting hash
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| :vartype digest_size: integer
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| """
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|
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| def __init__(self, data, digest_bytes, update_after_digest):
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|
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| self.digest_size = digest_bytes
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|
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| self._update_after_digest = update_after_digest
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| self._digest_done = False
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| self._padding = 0x01
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|
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| state = VoidPointer()
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| result = _raw_keccak_lib.keccak_init(state.address_of(),
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| c_size_t(self.digest_size * 2),
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| c_ubyte(24))
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| if result:
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| raise ValueError("Error %d while instantiating keccak" % result)
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| self._state = SmartPointer(state.get(),
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| _raw_keccak_lib.keccak_destroy)
|
| if data:
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| self.update(data)
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|
|
| def update(self, data):
|
| """Continue hashing of a message by consuming the next chunk of data.
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|
|
| Args:
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| data (byte string/byte array/memoryview): The next chunk of the message being hashed.
|
| """
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|
|
| if self._digest_done and not self._update_after_digest:
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| raise TypeError("You can only call 'digest' or 'hexdigest' on this object")
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|
|
| result = _raw_keccak_lib.keccak_absorb(self._state.get(),
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| c_uint8_ptr(data),
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| c_size_t(len(data)))
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| if result:
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| raise ValueError("Error %d while updating keccak" % result)
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| return self
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|
|
| def digest(self):
|
| """Return the **binary** (non-printable) digest of the message that has been hashed so far.
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|
|
| :return: The hash digest, computed over the data processed so far.
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| Binary form.
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| :rtype: byte string
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| """
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|
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| self._digest_done = True
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| bfr = create_string_buffer(self.digest_size)
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| result = _raw_keccak_lib.keccak_digest(self._state.get(),
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| bfr,
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| c_size_t(self.digest_size),
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| c_ubyte(self._padding))
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| if result:
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| raise ValueError("Error %d while squeezing keccak" % result)
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|
|
| return get_raw_buffer(bfr)
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|
|
| def hexdigest(self):
|
| """Return the **printable** digest of the message that has been hashed so far.
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|
|
| :return: The hash digest, computed over the data processed so far.
|
| Hexadecimal encoded.
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| :rtype: string
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| """
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|
|
| return "".join(["%02x" % bord(x) for x in self.digest()])
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|
|
| def new(self, **kwargs):
|
| """Create a fresh Keccak hash object."""
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|
|
| if "digest_bytes" not in kwargs and "digest_bits" not in kwargs:
|
| kwargs["digest_bytes"] = self.digest_size
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|
|
| return new(**kwargs)
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|
|
|
|
| def new(**kwargs):
|
| """Create a new hash object.
|
|
|
| Args:
|
| data (bytes/bytearray/memoryview):
|
| The very first chunk of the message to hash.
|
| It is equivalent to an early call to :meth:`Keccak_Hash.update`.
|
| digest_bytes (integer):
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| The size of the digest, in bytes (28, 32, 48, 64).
|
| digest_bits (integer):
|
| The size of the digest, in bits (224, 256, 384, 512).
|
| update_after_digest (boolean):
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| Whether :meth:`Keccak.digest` can be followed by another
|
| :meth:`Keccak.update` (default: ``False``).
|
|
|
| :Return: A :class:`Keccak_Hash` hash object
|
| """
|
|
|
| data = kwargs.pop("data", None)
|
| update_after_digest = kwargs.pop("update_after_digest", False)
|
|
|
| digest_bytes = kwargs.pop("digest_bytes", None)
|
| digest_bits = kwargs.pop("digest_bits", None)
|
| if None not in (digest_bytes, digest_bits):
|
| raise TypeError("Only one digest parameter must be provided")
|
| if (None, None) == (digest_bytes, digest_bits):
|
| raise TypeError("Digest size (bits, bytes) not provided")
|
| if digest_bytes is not None:
|
| if digest_bytes not in (28, 32, 48, 64):
|
| raise ValueError("'digest_bytes' must be: 28, 32, 48 or 64")
|
| else:
|
| if digest_bits not in (224, 256, 384, 512):
|
| raise ValueError("'digest_bytes' must be: 224, 256, 384 or 512")
|
| digest_bytes = digest_bits // 8
|
|
|
| if kwargs:
|
| raise TypeError("Unknown parameters: " + str(kwargs))
|
|
|
| return Keccak_Hash(data, digest_bytes, update_after_digest)
|
|
|
