Updated DB_Helper by adding firebase methods.

venv/Lib/site-packages/Crypto/IO/PEM.py

@@ -0,0 +1,174 @@
+#
+#  Util/PEM.py : Privacy Enhanced Mail utilities
+#
+# ===================================================================
+#
+# 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.
+# ===================================================================
+
+"""Set of functions for encapsulating data according to the PEM format.
+
+PEM (Privacy Enhanced Mail) was an IETF standard for securing emails via a
+Public Key Infrastructure. It is specified in RFC 1421-1424.
+
+Even though it has been abandoned, the simple message encapsulation it defined
+is still widely used today for encoding *binary* cryptographic objects like
+keys and certificates into text.
+"""
+
+__all__ = ['encode', 'decode']
+
+from Crypto.Util.py3compat import b, hexlify, unhexlify, tobytes, tostr
+
+import re
+from binascii import a2b_base64, b2a_base64
+
+from Crypto.Hash import MD5
+from Crypto.Util.Padding import pad, unpad
+from Crypto.Cipher import DES, DES3, AES
+from Crypto.Protocol.KDF import PBKDF1
+from Crypto.Random import get_random_bytes
+
+
+def encode(data, marker, passphrase=None, randfunc=None):
+    """Encode a piece of binary data into PEM format.
+
+    :Parameters:
+      data : byte string
+        The piece of binary data to encode.
+      marker : string
+        The marker for the PEM block (e.g. "PUBLIC KEY").
+        Note that there is no official master list for all allowed markers.
+        Still, you can refer to the OpenSSL_ source code.
+      passphrase : byte string
+        If given, the PEM block will be encrypted. The key is derived from
+        the passphrase.
+      randfunc : callable
+        Random number generation function; it accepts an integer N and returns
+        a byte string of random data, N bytes long. If not given, a new one is
+        instantiated.
+    :Returns:
+      The PEM block, as a string.
+
+    .. _OpenSSL: http://cvs.openssl.org/fileview?f=openssl/crypto/pem/pem.h&v=1.66.2.1.4.2
+    """
+
+    if randfunc is None:
+        randfunc = get_random_bytes
+
+    out = "-----BEGIN %s-----\n" % marker
+    if passphrase:
+        # We only support 3DES for encryption
+        salt = randfunc(8)
+        key = PBKDF1(passphrase, salt, 16, 1, MD5)
+        key += PBKDF1(key + passphrase, salt, 8, 1, MD5)
+        objenc = DES3.new(key, DES3.MODE_CBC, salt)
+        out += "Proc-Type: 4,ENCRYPTED\nDEK-Info: DES-EDE3-CBC,%s\n\n" %\
+            tostr(hexlify(salt).upper())
+        # Encrypt with PKCS#7 padding
+        data = objenc.encrypt(pad(data, objenc.block_size))
+    elif passphrase is not None:
+        raise ValueError("Empty password")
+
+    # Each BASE64 line can take up to 64 characters (=48 bytes of data)
+    # b2a_base64 adds a new line character!
+    chunks = [tostr(b2a_base64(data[i:i + 48]))
+              for i in range(0, len(data), 48)]
+    out += "".join(chunks)
+    out += "-----END %s-----" % marker
+    return out
+
+
+def decode(pem_data, passphrase=None):
+    """Decode a PEM block into binary.
+
+    :Parameters:
+      pem_data : string
+        The PEM block.
+      passphrase : byte string
+        If given and the PEM block is encrypted,
+        the key will be derived from the passphrase.
+    :Returns:
+      A tuple with the binary data, the marker string, and a boolean to
+      indicate if decryption was performed.
+    :Raises ValueError:
+      If decoding fails, if the PEM file is encrypted and no passphrase has
+      been provided or if the passphrase is incorrect.
+    """
+
+    # Verify Pre-Encapsulation Boundary
+    r = re.compile("\s*-----BEGIN (.*)-----\s+")
+    m = r.match(pem_data)
+    if not m:
+        raise ValueError("Not a valid PEM pre boundary")
+    marker = m.group(1)
+
+    # Verify Post-Encapsulation Boundary
+    r = re.compile("-----END (.*)-----\s*$")
+    m = r.search(pem_data)
+    if not m or m.group(1) != marker:
+        raise ValueError("Not a valid PEM post boundary")
+
+    # Removes spaces and slit on lines
+    lines = pem_data.replace(" ", '').split()
+
+    # Decrypts, if necessary
+    if lines[1].startswith('Proc-Type:4,ENCRYPTED'):
+        if not passphrase:
+            raise ValueError("PEM is encrypted, but no passphrase available")
+        DEK = lines[2].split(':')
+        if len(DEK) != 2 or DEK[0] != 'DEK-Info':
+            raise ValueError("PEM encryption format not supported.")
+        algo, salt = DEK[1].split(',')
+        salt = unhexlify(tobytes(salt))
+        if algo == "DES-CBC":
+            # This is EVP_BytesToKey in OpenSSL
+            key = PBKDF1(passphrase, salt, 8, 1, MD5)
+            objdec = DES.new(key, DES.MODE_CBC, salt)
+        elif algo == "DES-EDE3-CBC":
+            # Note that EVP_BytesToKey is note exactly the same as PBKDF1
+            key = PBKDF1(passphrase, salt, 16, 1, MD5)
+            key += PBKDF1(key + passphrase, salt, 8, 1, MD5)
+            objdec = DES3.new(key, DES3.MODE_CBC, salt)
+        elif algo == "AES-128-CBC":
+            key = PBKDF1(passphrase, salt[:8], 16, 1, MD5)
+            objdec = AES.new(key, AES.MODE_CBC, salt)
+        else:
+            raise ValueError("Unsupport PEM encryption algorithm (%s)." % algo)
+        lines = lines[2:]
+    else:
+        objdec = None
+
+    # Decode body
+    data = a2b_base64(b(''.join(lines[1:-1])))
+    enc_flag = False
+    if objdec:
+        data = unpad(objdec.decrypt(data), objdec.block_size)
+        enc_flag = True
+
+    return (data, marker, enc_flag)

venv/Lib/site-packages/Crypto/IO/PKCS8.py

@@ -0,0 +1,261 @@
+#
+#  PublicKey/PKCS8.py : PKCS#8 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.
+# ===================================================================
+
+"""
+Module for handling private keys wrapped according to `PKCS#8`_.
+
+PKCS8 is a standard for storing and transferring private key information.
+The wrapped key can either be clear or encrypted.
+
+All encryption algorithms are based on passphrase-based key derivation.
+The following mechanisms are fully supported:
+
+* *PBKDF2WithHMAC-SHA1AndAES128-CBC*
+* *PBKDF2WithHMAC-SHA1AndAES192-CBC*
+* *PBKDF2WithHMAC-SHA1AndAES256-CBC*
+* *PBKDF2WithHMAC-SHA1AndDES-EDE3-CBC*
+* *scryptAndAES128-CBC*
+* *scryptAndAES192-CBC*
+* *scryptAndAES256-CBC*
+
+The following mechanisms are only supported for importing keys.
+They are much weaker than the ones listed above, and they are provided
+for backward compatibility only:
+
+* *pbeWithMD5AndRC2-CBC*
+* *pbeWithMD5AndDES-CBC*
+* *pbeWithSHA1AndRC2-CBC*
+* *pbeWithSHA1AndDES-CBC*
+
+.. _`PKCS#8`: http://www.ietf.org/rfc/rfc5208.txt
+
+"""
+
+from Crypto.Util.py3compat import *
+
+from Crypto.Util.asn1 import (
+            DerNull,
+            DerSequence,
+            DerObjectId,
+            DerOctetString,
+            )
+
+from Crypto.IO._PBES import PBES1, PBES2, PbesError
+
+
+__all__ = ['wrap', 'unwrap']
+
+
+def wrap(private_key, key_oid, passphrase=None, protection=None,
+         prot_params=None, key_params=None, randfunc=None):
+    """Wrap a private key into a PKCS#8 blob (clear or encrypted).
+
+    :Parameters:
+
+      private_key : byte string
+        The private key encoded in binary form. The actual encoding is
+        algorithm specific. In most cases, it is DER.
+
+      key_oid : string
+        The object identifier (OID) of the private key to wrap.
+        It is a dotted string, like "``1.2.840.113549.1.1.1``" (for RSA keys).
+
+      passphrase : (binary) string
+        The secret passphrase from which the wrapping key is derived.
+        Set it only if encryption is required.
+
+      protection : string
+        The identifier of the algorithm to use for securely wrapping the key.
+        The default value is '``PBKDF2WithHMAC-SHA1AndDES-EDE3-CBC``'.
+
+      prot_params : dictionary
+        Parameters for 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.                                   |
+        +------------------+-----------------------------------------------+
+
+      key_params : DER object
+        The algorithm parameters associated to the private key.
+        It is required for algorithms like DSA, but not for others like RSA.
+
+      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 ``Crypto.Random``.
+
+    :Return:
+      The PKCS#8-wrapped private key (possibly encrypted),
+      as a binary string.
+    """
+
+    if key_params is None:
+        key_params = DerNull()
+
+    #
+    #   PrivateKeyInfo ::= SEQUENCE {
+    #       version                 Version,
+    #       privateKeyAlgorithm     PrivateKeyAlgorithmIdentifier,
+    #       privateKey              PrivateKey,
+    #       attributes              [0]  IMPLICIT Attributes OPTIONAL
+    #   }
+    #
+    pk_info = DerSequence([
+                0,
+                DerSequence([
+                    DerObjectId(key_oid),
+                    key_params
+                ]),
+                DerOctetString(private_key)
+            ])
+    pk_info_der = pk_info.encode()
+
+    if passphrase is None:
+        return pk_info_der
+
+    if not passphrase:
+        raise ValueError("Empty passphrase")
+
+    # Encryption with PBES2
+    passphrase = tobytes(passphrase)
+    if protection is None:
+        protection = 'PBKDF2WithHMAC-SHA1AndDES-EDE3-CBC'
+    return PBES2.encrypt(pk_info_der, passphrase,
+                         protection, prot_params, randfunc)
+
+
+def unwrap(p8_private_key, passphrase=None):
+    """Unwrap a private key from a PKCS#8 blob (clear or encrypted).
+
+    :Parameters:
+      p8_private_key : byte string
+        The private key wrapped into a PKCS#8 blob, DER encoded.
+      passphrase : (byte) string
+        The passphrase to use to decrypt the blob (if it is encrypted).
+    :Return:
+      A tuple containing:
+
+      #. the algorithm identifier of the wrapped key (OID, dotted string)
+      #. the private key (byte string, DER encoded)
+      #. the associated parameters (byte string, DER encoded) or ``None``
+
+    :Raises ValueError:
+      If decoding fails
+    """
+
+    if passphrase:
+        passphrase = tobytes(passphrase)
+
+        found = False
+        try:
+            p8_private_key = PBES1.decrypt(p8_private_key, passphrase)
+            found = True
+        except PbesError as e:
+            error_str = "PBES1[%s]" % str(e)
+        except ValueError:
+            error_str = "PBES1[Invalid]"
+
+        if not found:
+            try:
+                p8_private_key = PBES2.decrypt(p8_private_key, passphrase)
+                found = True
+            except PbesError as e:
+                error_str += ",PBES2[%s]" % str(e)
+            except ValueError:
+                error_str += ",PBES2[Invalid]"
+
+        if not found:
+            raise ValueError("Error decoding PKCS#8 (%s)" % error_str)
+
+    pk_info = DerSequence().decode(p8_private_key, nr_elements=(2, 3, 4))
+    if len(pk_info) == 2 and not passphrase:
+        raise ValueError("Not a valid clear PKCS#8 structure "
+                         "(maybe it is encrypted?)")
+
+    #
+    #   PrivateKeyInfo ::= SEQUENCE {
+    #       version                 Version,
+    #       privateKeyAlgorithm     PrivateKeyAlgorithmIdentifier,
+    #       privateKey              PrivateKey,
+    #       attributes              [0]  IMPLICIT Attributes OPTIONAL
+    #   }
+    #   Version ::= INTEGER
+    if pk_info[0] != 0:
+        raise ValueError("Not a valid PrivateKeyInfo SEQUENCE")
+
+    # PrivateKeyAlgorithmIdentifier ::= AlgorithmIdentifier
+    #
+    #   EncryptedPrivateKeyInfo ::= SEQUENCE {
+    #       encryptionAlgorithm  EncryptionAlgorithmIdentifier,
+    #       encryptedData        EncryptedData
+    #   }
+    #   EncryptionAlgorithmIdentifier ::= AlgorithmIdentifier
+
+    #   AlgorithmIdentifier  ::=  SEQUENCE  {
+    #       algorithm   OBJECT IDENTIFIER,
+    #       parameters  ANY DEFINED BY algorithm OPTIONAL
+    #   }
+
+    algo = DerSequence().decode(pk_info[1], nr_elements=(1, 2))
+    algo_oid = DerObjectId().decode(algo[0]).value
+    if len(algo) == 1:
+        algo_params = None
+    else:
+        try:
+            DerNull().decode(algo[1])
+            algo_params = None
+        except:
+            algo_params = algo[1]
+
+    #   EncryptedData ::= OCTET STRING
+    private_key = DerOctetString().decode(pk_info[2]).payload
+
+    return (algo_oid, private_key, algo_params)

venv/Lib/site-packages/Crypto/IO/_PBES.py

@@ -0,0 +1,388 @@
+#
+#  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 Crypto.Util.py3compat import *
+
+from Crypto import Random
+from Crypto.Util.asn1 import (
+            DerSequence, DerOctetString,
+            DerObjectId, DerInteger,
+            )
+
+from Crypto.Util.Padding import pad, unpad
+from Crypto.Hash import MD5, SHA1
+from Crypto.Cipher import DES, ARC2, DES3, AES
+from Crypto.Protocol.KDF import PBKDF1, PBKDF2, scrypt
+
+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 == "1.2.840.113549.1.5.3":
+            # PBE_MD5_DES_CBC
+            hashmod = MD5
+            ciphermod = DES
+        elif pbe_oid == "1.2.840.113549.1.5.6":
+            # PBE_MD5_RC2_CBC
+            hashmod = MD5
+            ciphermod = ARC2
+            cipher_params['effective_keylen'] = 64
+        elif pbe_oid == "1.2.840.113549.1.5.10":
+            # PBE_SHA1_DES_CBC
+            hashmod = SHA1
+            ciphermod = DES
+        elif pbe_oid == "1.2.840.113549.1.5.11":
+            # 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 ``Crypto.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 = "1.2.840.113549.3.7"
+        elif protection in ('PBKDF2WithHMAC-SHA1AndAES128-CBC',
+                'scryptAndAES128-CBC'):
+            key_size = 16
+            module = AES
+            cipher_mode = AES.MODE_CBC
+            enc_oid = "2.16.840.1.101.3.4.1.2"
+        elif protection in ('PBKDF2WithHMAC-SHA1AndAES192-CBC',
+                'scryptAndAES192-CBC'):
+            key_size = 24
+            module = AES
+            cipher_mode = AES.MODE_CBC
+            enc_oid = "2.16.840.1.101.3.4.1.22"
+        elif protection in ('PBKDF2WithHMAC-SHA1AndAES256-CBC',
+                'scryptAndAES256-CBC'):
+            key_size = 32
+            module = AES
+            cipher_mode = AES.MODE_CBC
+            enc_oid = "2.16.840.1.101.3.4.1.42"
+        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("1.2.840.113549.1.5.12"),   # 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("1.3.6.1.4.1.11591.4.11"),  # 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("1.2.840.113549.1.5.13"),   # 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 != "1.2.840.113549.1.5.13":
+            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
+
+        # We only support PBKDF2 or scrypt
+        if kdf_oid == "1.2.840.113549.1.5.12":
+
+            pbkdf2_params = DerSequence().decode(kdf_info[1], nr_elements=(2, 3, 4))
+            salt = DerOctetString().decode(pbkdf2_params[0]).payload
+            iteration_count = pbkdf2_params[1]
+            if len(pbkdf2_params) > 2:
+                kdf_key_length = pbkdf2_params[2]
+            else:
+                kdf_key_length = None
+            if len(pbkdf2_params) > 3:
+                raise PbesError("Unsupported PRF for PBKDF2")
+
+        elif kdf_oid == "1.3.6.1.4.1.11591.4.11":
+
+            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 == "1.2.840.113549.3.7":
+            # DES_EDE3_CBC
+            ciphermod = DES3
+            key_size = 24
+        elif enc_oid == "2.16.840.1.101.3.4.1.2":
+            # AES128_CBC
+            ciphermod = AES
+            key_size = 16
+        elif enc_oid == "2.16.840.1.101.3.4.1.22":
+            # AES192_CBC
+            ciphermod = AES
+            key_size = 24
+        elif enc_oid == "2.16.840.1.101.3.4.1.42":
+            # 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 == "1.2.840.113549.1.5.12": # PBKDF2
+            key = PBKDF2(passphrase, salt, key_size, iteration_count)
+        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)

venv/Lib/site-packages/Crypto/IO/__init__.py

@@ -0,0 +1,44 @@
+# ===================================================================
+#
+# 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.
+# ===================================================================
+
+"""
+Modules for reading and writing cryptographic data.
+
+========================  =============================================
+Module                    Description
+========================  =============================================
+Crypto.Util.PEM           Set of functions for encapsulating data according to the PEM format.
+Crypto.Util.PKCS8         Set of functions for wrapping/unwrapping private keys.
+========================  =============================================
+
+:undocumented: _PBES
+"""
+
+__all__ = ['PEM', 'PKCS8']