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rsa.py
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rsa.py
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# Copyright (c) 2013-2019 by Ron Frederick <ronf@timeheart.net> and others.
#
# This program and the accompanying materials are made available under
# the terms of the Eclipse Public License v2.0 which accompanies this
# distribution and is available at:
#
# http://www.eclipse.org/legal/epl-2.0/
#
# This program may also be made available under the following secondary
# licenses when the conditions for such availability set forth in the
# Eclipse Public License v2.0 are satisfied:
#
# GNU General Public License, Version 2.0, or any later versions of
# that license
#
# SPDX-License-Identifier: EPL-2.0 OR GPL-2.0-or-later
#
# Contributors:
# Ron Frederick - initial implementation, API, and documentation
"""RSA public key encryption handler"""
from .asn1 import ASN1DecodeError, ObjectIdentifier, der_encode, der_decode
from .crypto import RSAPrivateKey, RSAPublicKey
from .misc import all_ints
from .packet import MPInt
from .public_key import SSHKey, SSHOpenSSHCertificateV01, KeyExportError
from .public_key import register_public_key_alg, register_certificate_alg
from .public_key import register_x509_certificate_alg
class _RSAKey(SSHKey):
"""Handler for RSA public key encryption"""
algorithm = b'ssh-rsa'
pem_name = b'RSA'
pkcs8_oid = ObjectIdentifier('1.2.840.113549.1.1.1')
sig_algorithms = (b'rsa-sha2-256', b'rsa-sha2-512', b'ssh-rsa')
x509_sig_algorithms = (b'rsa2048-sha256', b'ssh-rsa')
x509_algorithms = tuple(b'x509v3-' + alg for alg in x509_sig_algorithms)
all_sig_algorithms = set(x509_sig_algorithms + sig_algorithms)
def __eq__(self, other):
# This isn't protected access - both objects are _RSAKey instances
# pylint: disable=protected-access
return (isinstance(other, type(self)) and
self._key.n == other._key.n and
self._key.e == other._key.e and
self._key.d == other._key.d)
def __hash__(self):
return hash((self._key.n, self._key.e, self._key.d,
self._key.p, self._key.q))
@classmethod
def generate(cls, _algorithm, *, key_size=2048, exponent=65537):
"""Generate a new RSA private key"""
return cls(RSAPrivateKey.generate(key_size, exponent))
@classmethod
def make_private(cls, n, e, d, p, q, dmp1, dmq1, iqmp):
"""Construct an RSA private key"""
return cls(RSAPrivateKey.construct(n, e, d, p, q, dmp1, dmq1, iqmp))
@classmethod
def make_public(cls, n, e):
"""Construct an RSA public key"""
return cls(RSAPublicKey.construct(n, e))
@classmethod
def decode_pkcs1_private(cls, key_data):
"""Decode a PKCS#1 format RSA private key"""
if (isinstance(key_data, tuple) and all_ints(key_data) and
len(key_data) >= 9):
return key_data[1:9]
else:
return None
@classmethod
def decode_pkcs1_public(cls, key_data):
"""Decode a PKCS#1 format RSA public key"""
if (isinstance(key_data, tuple) and all_ints(key_data) and
len(key_data) == 2):
return key_data
else:
return None
@classmethod
def decode_pkcs8_private(cls, alg_params, data):
"""Decode a PKCS#8 format RSA private key"""
if alg_params is not None:
return None
try:
key_data = der_decode(data)
except ASN1DecodeError:
return None
return cls.decode_pkcs1_private(key_data)
@classmethod
def decode_pkcs8_public(cls, alg_params, data):
"""Decode a PKCS#8 format RSA public key"""
if alg_params is not None:
return None
try:
key_data = der_decode(data)
except ASN1DecodeError:
return None
return cls.decode_pkcs1_public(key_data)
@classmethod
def decode_ssh_private(cls, packet):
"""Decode an SSH format RSA private key"""
n = packet.get_mpint()
e = packet.get_mpint()
d = packet.get_mpint()
iqmp = packet.get_mpint()
p = packet.get_mpint()
q = packet.get_mpint()
return n, e, d, p, q, d % (p-1), d % (q-1), iqmp
@classmethod
def decode_ssh_public(cls, packet):
"""Decode an SSH format RSA public key"""
e = packet.get_mpint()
n = packet.get_mpint()
return n, e
def encode_pkcs1_private(self):
"""Encode a PKCS#1 format RSA private key"""
if not self._key.d:
raise KeyExportError('Key is not private')
return (0, self._key.n, self._key.e, self._key.d, self._key.p,
self._key.q, self._key.dmp1, self._key.dmq1, self._key.iqmp)
def encode_pkcs1_public(self):
"""Encode a PKCS#1 format RSA public key"""
return self._key.n, self._key.e
def encode_pkcs8_private(self):
"""Encode a PKCS#8 format RSA private key"""
return None, der_encode(self.encode_pkcs1_private())
def encode_pkcs8_public(self):
"""Encode a PKCS#8 format RSA public key"""
return None, der_encode(self.encode_pkcs1_public())
def encode_ssh_private(self):
"""Encode an SSH format RSA private key"""
if not self._key.d:
raise KeyExportError('Key is not private')
return b''.join((MPInt(self._key.n), MPInt(self._key.e),
MPInt(self._key.d), MPInt(self._key.iqmp),
MPInt(self._key.p), MPInt(self._key.q)))
def encode_ssh_public(self):
"""Encode an SSH format RSA public key"""
return b''.join((MPInt(self._key.e), MPInt(self._key.n)))
def encode_agent_cert_private(self):
"""Encode RSA certificate private key data for agent"""
if not self._key.d:
raise KeyExportError('Key is not private')
return b''.join((MPInt(self._key.d), MPInt(self._key.iqmp),
MPInt(self._key.p), MPInt(self._key.q)))
def sign_der(self, data, sig_algorithm):
"""Compute a DER-encoded signature of the specified data"""
if not self._key.d:
raise ValueError('Private key needed for signing')
return self._key.sign(data, sig_algorithm)
def verify_der(self, data, sig_algorithm, sig):
"""Verify a DER-encoded signature of the specified data"""
return self._key.verify(data, sig, sig_algorithm)
def sign_ssh(self, data, sig_algorithm):
"""Compute an SSH-encoded signature of the specified data"""
return self.sign_der(data, sig_algorithm)
def verify_ssh(self, data, sig_algorithm, sig):
"""Verify an SSH-encoded signature of the specified data"""
return self.verify_der(data, sig_algorithm, sig)
def encrypt(self, data, algorithm):
"""Encrypt a block of data with this key"""
return self._key.encrypt(data, algorithm)
def decrypt(self, data, algorithm):
"""Decrypt a block of data with this key"""
return self._key.decrypt(data, algorithm)
register_public_key_alg(b'ssh-rsa', _RSAKey)
register_certificate_alg(1, b'ssh-rsa', b'ssh-rsa-cert-v01@openssh.com',
_RSAKey, SSHOpenSSHCertificateV01)
for alg in _RSAKey.x509_algorithms:
register_x509_certificate_alg(alg)