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# Copyright (c) 2013-2022 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 typing import Optional, Tuple, Union, cast
from .asn1 import ASN1DecodeError, ObjectIdentifier, der_encode, der_decode
from .crypto import RSAPrivateKey, RSAPublicKey
from .misc import all_ints
from .packet import MPInt, String, SSHPacket
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
_hash_algs = {b'ssh-rsa': 'sha1',
b'rsa-sha2-256': 'sha256',
b'rsa-sha2-512': 'sha512',
b'ssh-rsa-sha224@ssh.com': 'sha224',
b'ssh-rsa-sha256@ssh.com': 'sha256',
b'ssh-rsa-sha384@ssh.com': 'sha384',
b'ssh-rsa-sha512@ssh.com': 'sha512',
b'rsa1024-sha1': 'sha1',
b'rsa2048-sha256': 'sha256'}
_PrivateKeyArgs = Tuple[int, int, int, int, int, int, int, int]
_PublicKeyArgs = Tuple[int, int]
class RSAKey(SSHKey):
"""Handler for RSA public key encryption"""
_key: Union[RSAPrivateKey, RSAPublicKey]
algorithm = b'ssh-rsa'
default_hash_name = 'sha256'
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-sha224@ssh.com', b'ssh-rsa-sha256@ssh.com',
b'ssh-rsa-sha384@ssh.com', b'ssh-rsa-sha512@ssh.com',
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: object) -> bool:
# This isn't protected access - both objects are RSAKey instances
# pylint: disable=protected-access
if not isinstance(other, RSAKey):
return NotImplemented
return (self._key.n == other._key.n and
self._key.e == other._key.e and
self._key.d == other._key.d)
def __hash__(self) -> int:
return hash((self._key.n, self._key.e, self._key.d,
self._key.p, self._key.q))
@classmethod
def generate(cls, algorithm: bytes, *, # type: ignore
key_size: int = 2048, exponent: int = 65537) -> 'RSAKey':
"""Generate a new RSA private key"""
# pylint: disable=arguments-differ,unused-argument
return cls(RSAPrivateKey.generate(key_size, exponent))
@classmethod
def make_private(cls, key_params: object) -> SSHKey:
"""Construct an RSA private key"""
n, e, d, p, q, dmp1, dmq1, iqmp = cast(_PrivateKeyArgs, key_params)
return cls(RSAPrivateKey.construct(n, e, d, p, q, dmp1, dmq1, iqmp))
@classmethod
def make_public(cls, key_params: object) -> SSHKey:
"""Construct an RSA public key"""
n, e = cast(_PublicKeyArgs, key_params)
return cls(RSAPublicKey.construct(n, e))
@classmethod
def decode_pkcs1_private(cls, key_data: object) -> \
Optional[_PrivateKeyArgs]:
"""Decode a PKCS#1 format RSA private key"""
if (isinstance(key_data, tuple) and all_ints(key_data) and
len(key_data) >= 9):
return cast(_PrivateKeyArgs, key_data[1:9])
else:
return None
@classmethod
def decode_pkcs1_public(cls, key_data: object) -> \
Optional[_PublicKeyArgs]:
"""Decode a PKCS#1 format RSA public key"""
if (isinstance(key_data, tuple) and all_ints(key_data) and
len(key_data) == 2):
return cast(_PublicKeyArgs, key_data)
else:
return None
@classmethod
def decode_pkcs8_private(cls, alg_params: object,
data: bytes) -> Optional[_PrivateKeyArgs]:
"""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: object,
data: bytes) -> Optional[_PublicKeyArgs]:
"""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: SSHPacket) -> _PrivateKeyArgs:
"""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: SSHPacket) -> _PublicKeyArgs:
"""Decode an SSH format RSA public key"""
e = packet.get_mpint()
n = packet.get_mpint()
return n, e
def encode_pkcs1_private(self) -> object:
"""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) -> object:
"""Encode a PKCS#1 format RSA public key"""
return self._key.n, self._key.e
def encode_pkcs8_private(self) -> Tuple[object, object]:
"""Encode a PKCS#8 format RSA private key"""
return None, der_encode(self.encode_pkcs1_private())
def encode_pkcs8_public(self) -> Tuple[object, object]:
"""Encode a PKCS#8 format RSA public key"""
return None, der_encode(self.encode_pkcs1_public())
def encode_ssh_private(self) -> bytes:
"""Encode an SSH format RSA private key"""
if not self._key.d:
raise KeyExportError('Key is not private')
assert self._key.iqmp is not None
assert self._key.p is not None
assert self._key.q is not None
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) -> bytes:
"""Encode an SSH format RSA public key"""
return b''.join((MPInt(self._key.e), MPInt(self._key.n)))
def encode_agent_cert_private(self) -> bytes:
"""Encode RSA certificate private key data for agent"""
if not self._key.d:
raise KeyExportError('Key is not private')
assert self._key.iqmp is not None
assert self._key.p is not None
assert self._key.q is not None
return b''.join((MPInt(self._key.d), MPInt(self._key.iqmp),
MPInt(self._key.p), MPInt(self._key.q)))
def sign_ssh(self, data: bytes, sig_algorithm: bytes) -> bytes:
"""Compute an SSH-encoded signature of the specified data"""
if not self._key.d:
raise ValueError('Private key needed for signing')
return String(self._key.sign(data, _hash_algs[sig_algorithm]))
def verify_ssh(self, data: bytes, sig_algorithm: bytes,
packet: SSHPacket) -> bool:
"""Verify an SSH-encoded signature of the specified data"""
sig = packet.get_string()
packet.check_end()
return self._key.verify(data, sig, _hash_algs[sig_algorithm])
def encrypt(self, data: bytes, algorithm: bytes) -> Optional[bytes]:
"""Encrypt a block of data with this key"""
pub_key = cast(RSAPublicKey, self._key)
return pub_key.encrypt(data, _hash_algs[algorithm])
def decrypt(self, data: bytes, algorithm: bytes) -> Optional[bytes]:
"""Decrypt a block of data with this key"""
priv_key = cast(RSAPrivateKey, self._key)
return priv_key.decrypt(data, _hash_algs[algorithm])
register_public_key_alg(b'ssh-rsa', RSAKey, True)
for _alg in (b'rsa-sha2-256', b'rsa-sha2-512', b'ssh-rsa'):
register_certificate_alg(1, _alg, _alg + b'-cert-v01@openssh.com',
RSAKey, SSHOpenSSHCertificateV01, True)
for _alg in RSAKey.x509_algorithms:
register_x509_certificate_alg(_alg, True)
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