diff options
| -rw-r--r-- | cryptography/hazmat/backends/openssl/backend.py | 8 | ||||
| -rw-r--r-- | cryptography/hazmat/primitives/ciphers/algorithms.py | 14 | ||||
| -rw-r--r-- | docs/hazmat/primitives/symmetric-encryption.rst | 12 |
3 files changed, 33 insertions, 1 deletions
diff --git a/cryptography/hazmat/backends/openssl/backend.py b/cryptography/hazmat/backends/openssl/backend.py index b4625aae..5d739135 100644 --- a/cryptography/hazmat/backends/openssl/backend.py +++ b/cryptography/hazmat/backends/openssl/backend.py @@ -28,7 +28,7 @@ from cryptography.hazmat.bindings.openssl.binding import Binding from cryptography.hazmat.primitives import interfaces, hashes from cryptography.hazmat.primitives.asymmetric import rsa from cryptography.hazmat.primitives.ciphers.algorithms import ( - AES, Blowfish, Camellia, TripleDES, ARC4, CAST5 + AES, Blowfish, Camellia, CAST5, TripleDES, ARC4, IDEA ) from cryptography.hazmat.primitives.ciphers.modes import ( CBC, CTR, ECB, OFB, CFB, GCM, @@ -175,6 +175,12 @@ class Backend(object): GCM, GetCipherByName("{cipher.name}-{cipher.key_size}-{mode.name}") ) + for mode_cls in [ECB]: + self.register_cipher_adapter( + IDEA, + mode_cls, + GetCipherByName("idea-{mode.name}") + ) def create_symmetric_encryption_ctx(self, cipher, mode): return _CipherContext(self, cipher, mode, _CipherContext._ENCRYPT) diff --git a/cryptography/hazmat/primitives/ciphers/algorithms.py b/cryptography/hazmat/primitives/ciphers/algorithms.py index a5cfce92..2d37e0cf 100644 --- a/cryptography/hazmat/primitives/ciphers/algorithms.py +++ b/cryptography/hazmat/primitives/ciphers/algorithms.py @@ -116,3 +116,17 @@ class ARC4(object): @property def key_size(self): return len(self.key) * 8 + + +@utils.register_interface(interfaces.CipherAlgorithm) +class IDEA(object): + name = "IDEA" + block_size = 64 + key_sizes = frozenset([128]) + + def __init__(self, key): + self.key = _verify_key_size(self, key) + + @property + def key_size(self): + return len(self.key) * 8 diff --git a/docs/hazmat/primitives/symmetric-encryption.rst b/docs/hazmat/primitives/symmetric-encryption.rst index 2ee5085b..daa4b36f 100644 --- a/docs/hazmat/primitives/symmetric-encryption.rst +++ b/docs/hazmat/primitives/symmetric-encryption.rst @@ -165,6 +165,16 @@ Weak Ciphers >>> decryptor.update(ct) 'a secret message' +.. class:: IDEA(key) + + IDEA (`International Data Encryption Algorithm`_) is a block cipher created + in 1991. It is an optional component of the `OpenPGP`_ standard. This cipher + is susceptible to attacks when using weak keys. It is recommended that you + do not use this cipher for new applications. + + :param bytes key: The secret key, 128 bits in length. This must be kept + secret. + .. _symmetric-encryption-modes: @@ -468,3 +478,5 @@ Interfaces .. _`encrypt`: https://ssd.eff.org/tech/encryption .. _`CRYPTREC`: http://www.cryptrec.go.jp/english/ .. _`significant patterns in the output`: http://en.wikipedia.org/wiki/Cipher_block_chaining#Electronic_codebook_.28ECB.29 +.. _`International Data Encryption Algorithm`: https://en.wikipedia.org/wiki/International_Data_Encryption_Algorithm +.. _`OpenPGP`: http://www.openpgp.org |