aboutsummaryrefslogtreecommitdiff
path: root/frozen_deps/Cryptodome/IO/_PBES.py
diff options
context:
space:
mode:
Diffstat (limited to 'frozen_deps/Cryptodome/IO/_PBES.py')
-rw-r--r--frozen_deps/Cryptodome/IO/_PBES.py435
1 files changed, 435 insertions, 0 deletions
diff --git a/frozen_deps/Cryptodome/IO/_PBES.py b/frozen_deps/Cryptodome/IO/_PBES.py
new file mode 100644
index 0000000..9ee5385
--- /dev/null
+++ b/frozen_deps/Cryptodome/IO/_PBES.py
@@ -0,0 +1,435 @@
+#
+# PublicKey/_PBES.py : Password-Based Encryption functions
+#
+# ===================================================================
+#
+# Copyright (c) 2014, Legrandin <helderijs@gmail.com>
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+#
+# 1. Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+# notice, this list of conditions and the following disclaimer in
+# the documentation and/or other materials provided with the
+# distribution.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+# COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+# ===================================================================
+
+from Cryptodome import Random
+from Cryptodome.Util.asn1 import (
+ DerSequence, DerOctetString,
+ DerObjectId, DerInteger,
+ )
+
+from Cryptodome.Util.Padding import pad, unpad
+from Cryptodome.Hash import MD5, SHA1, SHA224, SHA256, SHA384, SHA512
+from Cryptodome.Cipher import DES, ARC2, DES3, AES
+from Cryptodome.Protocol.KDF import PBKDF1, PBKDF2, scrypt
+
+_OID_PBE_WITH_MD5_AND_DES_CBC = "1.2.840.113549.1.5.3"
+_OID_PBE_WITH_MD5_AND_RC2_CBC = "1.2.840.113549.1.5.6"
+_OID_PBE_WITH_SHA1_AND_DES_CBC = "1.2.840.113549.1.5.10"
+_OID_PBE_WITH_SHA1_AND_RC2_CBC = "1.2.840.113549.1.5.11"
+
+_OID_PBES2 = "1.2.840.113549.1.5.13"
+
+_OID_PBKDF2 = "1.2.840.113549.1.5.12"
+_OID_SCRYPT = "1.3.6.1.4.1.11591.4.11"
+
+_OID_HMAC_SHA1 = "1.2.840.113549.2.7"
+_OID_HMAC_SHA224 = "1.2.840.113549.2.8"
+_OID_HMAC_SHA256 = "1.2.840.113549.2.9"
+_OID_HMAC_SHA384 = "1.2.840.113549.2.10"
+_OID_HMAC_SHA512 = "1.2.840.113549.2.11"
+
+_OID_DES_EDE3_CBC = "1.2.840.113549.3.7"
+_OID_AES128_CBC = "2.16.840.1.101.3.4.1.2"
+_OID_AES192_CBC = "2.16.840.1.101.3.4.1.22"
+_OID_AES256_CBC = "2.16.840.1.101.3.4.1.42"
+
+
+class PbesError(ValueError):
+ pass
+
+# These are the ASN.1 definitions used by the PBES1/2 logic:
+#
+# EncryptedPrivateKeyInfo ::= SEQUENCE {
+# encryptionAlgorithm EncryptionAlgorithmIdentifier,
+# encryptedData EncryptedData
+# }
+#
+# EncryptionAlgorithmIdentifier ::= AlgorithmIdentifier
+#
+# EncryptedData ::= OCTET STRING
+#
+# AlgorithmIdentifier ::= SEQUENCE {
+# algorithm OBJECT IDENTIFIER,
+# parameters ANY DEFINED BY algorithm OPTIONAL
+# }
+#
+# PBEParameter ::= SEQUENCE {
+# salt OCTET STRING (SIZE(8)),
+# iterationCount INTEGER
+# }
+#
+# PBES2-params ::= SEQUENCE {
+# keyDerivationFunc AlgorithmIdentifier {{PBES2-KDFs}},
+# encryptionScheme AlgorithmIdentifier {{PBES2-Encs}}
+# }
+#
+# PBKDF2-params ::= SEQUENCE {
+# salt CHOICE {
+# specified OCTET STRING,
+# otherSource AlgorithmIdentifier {{PBKDF2-SaltSources}}
+# },
+# iterationCount INTEGER (1..MAX),
+# keyLength INTEGER (1..MAX) OPTIONAL,
+# prf AlgorithmIdentifier {{PBKDF2-PRFs}} DEFAULT algid-hmacWithSHA1
+# }
+#
+# scrypt-params ::= SEQUENCE {
+# salt OCTET STRING,
+# costParameter INTEGER (1..MAX),
+# blockSize INTEGER (1..MAX),
+# parallelizationParameter INTEGER (1..MAX),
+# keyLength INTEGER (1..MAX) OPTIONAL
+# }
+
+class PBES1(object):
+ """Deprecated encryption scheme with password-based key derivation
+ (originally defined in PKCS#5 v1.5, but still present in `v2.0`__).
+
+ .. __: http://www.ietf.org/rfc/rfc2898.txt
+ """
+
+ @staticmethod
+ def decrypt(data, passphrase):
+ """Decrypt a piece of data using a passphrase and *PBES1*.
+
+ The algorithm to use is automatically detected.
+
+ :Parameters:
+ data : byte string
+ The piece of data to decrypt.
+ passphrase : byte string
+ The passphrase to use for decrypting the data.
+ :Returns:
+ The decrypted data, as a binary string.
+ """
+
+ enc_private_key_info = DerSequence().decode(data)
+ encrypted_algorithm = DerSequence().decode(enc_private_key_info[0])
+ encrypted_data = DerOctetString().decode(enc_private_key_info[1]).payload
+
+ pbe_oid = DerObjectId().decode(encrypted_algorithm[0]).value
+ cipher_params = {}
+ if pbe_oid == _OID_PBE_WITH_MD5_AND_DES_CBC:
+ # PBE_MD5_DES_CBC
+ hashmod = MD5
+ ciphermod = DES
+ elif pbe_oid == _OID_PBE_WITH_MD5_AND_RC2_CBC:
+ # PBE_MD5_RC2_CBC
+ hashmod = MD5
+ ciphermod = ARC2
+ cipher_params['effective_keylen'] = 64
+ elif pbe_oid == _OID_PBE_WITH_SHA1_AND_DES_CBC:
+ # PBE_SHA1_DES_CBC
+ hashmod = SHA1
+ ciphermod = DES
+ elif pbe_oid == _OID_PBE_WITH_SHA1_AND_RC2_CBC:
+ # PBE_SHA1_RC2_CBC
+ hashmod = SHA1
+ ciphermod = ARC2
+ cipher_params['effective_keylen'] = 64
+ else:
+ raise PbesError("Unknown OID for PBES1")
+
+ pbe_params = DerSequence().decode(encrypted_algorithm[1], nr_elements=2)
+ salt = DerOctetString().decode(pbe_params[0]).payload
+ iterations = pbe_params[1]
+
+ key_iv = PBKDF1(passphrase, salt, 16, iterations, hashmod)
+ key, iv = key_iv[:8], key_iv[8:]
+
+ cipher = ciphermod.new(key, ciphermod.MODE_CBC, iv, **cipher_params)
+ pt = cipher.decrypt(encrypted_data)
+ return unpad(pt, cipher.block_size)
+
+
+class PBES2(object):
+ """Encryption scheme with password-based key derivation
+ (defined in `PKCS#5 v2.0`__).
+
+ .. __: http://www.ietf.org/rfc/rfc2898.txt."""
+
+ @staticmethod
+ def encrypt(data, passphrase, protection, prot_params=None, randfunc=None):
+ """Encrypt a piece of data using a passphrase and *PBES2*.
+
+ :Parameters:
+ data : byte string
+ The piece of data to encrypt.
+ passphrase : byte string
+ The passphrase to use for encrypting the data.
+ protection : string
+ The identifier of the encryption algorithm to use.
+ The default value is '``PBKDF2WithHMAC-SHA1AndDES-EDE3-CBC``'.
+ prot_params : dictionary
+ Parameters of the protection algorithm.
+
+ +------------------+-----------------------------------------------+
+ | Key | Description |
+ +==================+===============================================+
+ | iteration_count | The KDF algorithm is repeated several times to|
+ | | slow down brute force attacks on passwords |
+ | | (called *N* or CPU/memory cost in scrypt). |
+ | | |
+ | | The default value for PBKDF2 is 1 000. |
+ | | The default value for scrypt is 16 384. |
+ +------------------+-----------------------------------------------+
+ | salt_size | Salt is used to thwart dictionary and rainbow |
+ | | attacks on passwords. The default value is 8 |
+ | | bytes. |
+ +------------------+-----------------------------------------------+
+ | block_size | *(scrypt only)* Memory-cost (r). The default |
+ | | value is 8. |
+ +------------------+-----------------------------------------------+
+ | parallelization | *(scrypt only)* CPU-cost (p). The default |
+ | | value is 1. |
+ +------------------+-----------------------------------------------+
+
+
+ randfunc : callable
+ Random number generation function; it should accept
+ a single integer N and return a string of random data,
+ N bytes long. If not specified, a new RNG will be
+ instantiated from ``Cryptodome.Random``.
+
+ :Returns:
+ The encrypted data, as a binary string.
+ """
+
+ if prot_params is None:
+ prot_params = {}
+
+ if randfunc is None:
+ randfunc = Random.new().read
+
+ if protection == 'PBKDF2WithHMAC-SHA1AndDES-EDE3-CBC':
+ key_size = 24
+ module = DES3
+ cipher_mode = DES3.MODE_CBC
+ enc_oid = _OID_DES_EDE3_CBC
+ elif protection in ('PBKDF2WithHMAC-SHA1AndAES128-CBC',
+ 'scryptAndAES128-CBC'):
+ key_size = 16
+ module = AES
+ cipher_mode = AES.MODE_CBC
+ enc_oid = _OID_AES128_CBC
+ elif protection in ('PBKDF2WithHMAC-SHA1AndAES192-CBC',
+ 'scryptAndAES192-CBC'):
+ key_size = 24
+ module = AES
+ cipher_mode = AES.MODE_CBC
+ enc_oid = _OID_AES192_CBC
+ elif protection in ('PBKDF2WithHMAC-SHA1AndAES256-CBC',
+ 'scryptAndAES256-CBC'):
+ key_size = 32
+ module = AES
+ cipher_mode = AES.MODE_CBC
+ enc_oid = _OID_AES256_CBC
+ else:
+ raise ValueError("Unknown PBES2 mode")
+
+ # Get random data
+ iv = randfunc(module.block_size)
+ salt = randfunc(prot_params.get("salt_size", 8))
+
+ # Derive key from password
+ if protection.startswith('PBKDF2'):
+ count = prot_params.get("iteration_count", 1000)
+ key = PBKDF2(passphrase, salt, key_size, count)
+ kdf_info = DerSequence([
+ DerObjectId(_OID_PBKDF2), # PBKDF2
+ DerSequence([
+ DerOctetString(salt),
+ DerInteger(count)
+ ])
+ ])
+ else:
+ # It must be scrypt
+ count = prot_params.get("iteration_count", 16384)
+ scrypt_r = prot_params.get('block_size', 8)
+ scrypt_p = prot_params.get('parallelization', 1)
+ key = scrypt(passphrase, salt, key_size,
+ count, scrypt_r, scrypt_p)
+ kdf_info = DerSequence([
+ DerObjectId(_OID_SCRYPT), # scrypt
+ DerSequence([
+ DerOctetString(salt),
+ DerInteger(count),
+ DerInteger(scrypt_r),
+ DerInteger(scrypt_p)
+ ])
+ ])
+
+ # Create cipher and use it
+ cipher = module.new(key, cipher_mode, iv)
+ encrypted_data = cipher.encrypt(pad(data, cipher.block_size))
+ enc_info = DerSequence([
+ DerObjectId(enc_oid),
+ DerOctetString(iv)
+ ])
+
+ # Result
+ enc_private_key_info = DerSequence([
+ # encryptionAlgorithm
+ DerSequence([
+ DerObjectId(_OID_PBES2),
+ DerSequence([
+ kdf_info,
+ enc_info
+ ]),
+ ]),
+ DerOctetString(encrypted_data)
+ ])
+ return enc_private_key_info.encode()
+
+ @staticmethod
+ def decrypt(data, passphrase):
+ """Decrypt a piece of data using a passphrase and *PBES2*.
+
+ The algorithm to use is automatically detected.
+
+ :Parameters:
+ data : byte string
+ The piece of data to decrypt.
+ passphrase : byte string
+ The passphrase to use for decrypting the data.
+ :Returns:
+ The decrypted data, as a binary string.
+ """
+
+ enc_private_key_info = DerSequence().decode(data, nr_elements=2)
+ enc_algo = DerSequence().decode(enc_private_key_info[0])
+ encrypted_data = DerOctetString().decode(enc_private_key_info[1]).payload
+
+ pbe_oid = DerObjectId().decode(enc_algo[0]).value
+ if pbe_oid != _OID_PBES2:
+ raise PbesError("Not a PBES2 object")
+
+ pbes2_params = DerSequence().decode(enc_algo[1], nr_elements=2)
+
+ ### Key Derivation Function selection
+ kdf_info = DerSequence().decode(pbes2_params[0], nr_elements=2)
+ kdf_oid = DerObjectId().decode(kdf_info[0]).value
+
+ kdf_key_length = None
+
+ # We only support PBKDF2 or scrypt
+ if kdf_oid == _OID_PBKDF2:
+
+ pbkdf2_params = DerSequence().decode(kdf_info[1], nr_elements=(2, 3, 4))
+ salt = DerOctetString().decode(pbkdf2_params[0]).payload
+ iteration_count = pbkdf2_params[1]
+
+ left = len(pbkdf2_params) - 2
+ idx = 2
+
+ if left > 0:
+ try:
+ kdf_key_length = pbkdf2_params[idx] - 0
+ left -= 1
+ idx += 1
+ except TypeError:
+ pass
+
+ # Default is HMAC-SHA1
+ pbkdf2_prf_oid = "1.2.840.113549.2.7"
+ if left > 0:
+ pbkdf2_prf_algo_id = DerSequence().decode(pbkdf2_params[idx])
+ pbkdf2_prf_oid = DerObjectId().decode(pbkdf2_prf_algo_id[0]).value
+
+ elif kdf_oid == _OID_SCRYPT:
+
+ scrypt_params = DerSequence().decode(kdf_info[1], nr_elements=(4, 5))
+ salt = DerOctetString().decode(scrypt_params[0]).payload
+ iteration_count, scrypt_r, scrypt_p = [scrypt_params[x]
+ for x in (1, 2, 3)]
+ if len(scrypt_params) > 4:
+ kdf_key_length = scrypt_params[4]
+ else:
+ kdf_key_length = None
+ else:
+ raise PbesError("Unsupported PBES2 KDF")
+
+ ### Cipher selection
+ enc_info = DerSequence().decode(pbes2_params[1])
+ enc_oid = DerObjectId().decode(enc_info[0]).value
+
+ if enc_oid == _OID_DES_EDE3_CBC:
+ # DES_EDE3_CBC
+ ciphermod = DES3
+ key_size = 24
+ elif enc_oid == _OID_AES128_CBC:
+ # AES128_CBC
+ ciphermod = AES
+ key_size = 16
+ elif enc_oid == _OID_AES192_CBC:
+ # AES192_CBC
+ ciphermod = AES
+ key_size = 24
+ elif enc_oid == _OID_AES256_CBC:
+ # AES256_CBC
+ ciphermod = AES
+ key_size = 32
+ else:
+ raise PbesError("Unsupported PBES2 cipher")
+
+ if kdf_key_length and kdf_key_length != key_size:
+ raise PbesError("Mismatch between PBES2 KDF parameters"
+ " and selected cipher")
+
+ IV = DerOctetString().decode(enc_info[1]).payload
+
+ # Create cipher
+ if kdf_oid == _OID_PBKDF2:
+ if pbkdf2_prf_oid == _OID_HMAC_SHA1:
+ hmac_hash_module = SHA1
+ elif pbkdf2_prf_oid == _OID_HMAC_SHA224:
+ hmac_hash_module = SHA224
+ elif pbkdf2_prf_oid == _OID_HMAC_SHA256:
+ hmac_hash_module = SHA256
+ elif pbkdf2_prf_oid == _OID_HMAC_SHA384:
+ hmac_hash_module = SHA384
+ elif pbkdf2_prf_oid == _OID_HMAC_SHA512:
+ hmac_hash_module = SHA512
+ else:
+ raise PbesError("Unsupported HMAC %s" % pbkdf2_prf_oid)
+
+ key = PBKDF2(passphrase, salt, key_size, iteration_count,
+ hmac_hash_module=hmac_hash_module)
+ else:
+ key = scrypt(passphrase, salt, key_size, iteration_count,
+ scrypt_r, scrypt_p)
+ cipher = ciphermod.new(key, ciphermod.MODE_CBC, IV)
+
+ # Decrypt data
+ pt = cipher.decrypt(encrypted_data)
+ return unpad(pt, cipher.block_size)
Powered by cgit, Themed by Ted Yin.