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""" default_algorithms = { 'none': NoneAlgorithm(), 'HS256': HMACAlgorithm(HMACAlgorithm.SHA256), 'HS384': HMACAlgorithm(HMACAlgorithm.SHA384), 'HS512': HMACAlgorithm(HMACAlgorithm.SHA512) } if has_crypto: default_algorithms.update({ 'RS256': RSAAlgorithm(RSAAlgorithm.SHA256), 'RS384': RSAAlgorithm(RSAAlgorithm.SHA384), 'RS512': RSAAlgorithm(RSAAlgorithm.SHA512), 'ES256': ECAlgorithm(ECAlgorithm.SHA256), 'ES384': ECAlgorithm(ECAlgorithm.SHA384), 'ES521': ECAlgorithm(ECAlgorithm.SHA512), 'ES512': ECAlgorithm(ECAlgorithm.SHA512), # Backward compat for #219 fix 'PS256': RSAPSSAlgorithm(RSAPSSAlgorithm.SHA256), 'PS384': RSAPSSAlgorithm(RSAPSSAlgorithm.SHA384), 'PS512': RSAPSSAlgorithm(RSAPSSAlgorithm.SHA512) }) return default_algorithms class Algorithm(object): """ The interface for an algorithm used to sign and verify tokens. """ def prepare_key(self, key): """ Performs necessary validation and conversions on the key and returns the key value in the proper format for sign() and verify(). """ raise NotImplementedError def sign(self, msg, key): """ Returns a digital signature for the specified message using the specified key value. """ raise NotImplementedError def verify(self, msg, key, sig): """ Verifies that the specified digital signature is valid for the specified message and key values. """ raise NotImplementedError @staticmethod def to_jwk(key_obj): """ Serializes a given RSA key into a JWK """ raise NotImplementedError @staticmethod def from_jwk(jwk): """ Deserializes a given RSA key from JWK back into a PublicKey or PrivateKey object """ raise NotImplementedError class NoneAlgorithm(Algorithm): """ Placeholder for use when no signing or verification operations are required. """ def prepare_key(self, key): if key == '': key = None if key is not None: raise InvalidKeyError('When alg = "none", key value must be None.') return key def sign(self, msg, key): return b'' def verify(self, msg, key, sig): return False class HMACAlgorithm(Algorithm): """ Performs signing and verification operations using HMAC and the specified hash function. """ SHA256 = hashlib.sha256 SHA384 = hashlib.sha384 SHA512 = hashlib.sha512 def __init__(self, hash_alg): self.hash_alg = hash_alg def prepare_key(self, key): key = force_bytes(key) invalid_strings = [ b'-----BEGIN PUBLIC KEY-----', b'-----BEGIN CERTIFICATE-----', b'-----BEGIN RSA PUBLIC KEY-----', b'ssh-rsa' ] if any([string_value in key for string_value in invalid_strings]): raise InvalidKeyError( 'The specified key is an asymmetric key or x509 certificate and' ' should not be used as an HMAC secret.') return key @staticmethod def to_jwk(key_obj): return json.dumps({ 'k': force_unicode(base64url_encode(force_bytes(key_obj))), 'kty': 'oct' }) @staticmethod def from_jwk(jwk): obj = json.loads(jwk) if obj.get('kty') != 'oct': raise InvalidKeyError('Not an HMAC key') return base64url_decode(obj['k']) def sign(self, msg, key): return hmac.new(key, msg, self.hash_alg).digest() def verify(self, msg, key, sig): return constant_time_compare(sig, self.sign(msg, key)) if has_crypto: class RSAAlgorithm(Algorithm): """ Performs signing and verification operations using RSASSA-PKCS-v1_5 and the specified hash function. """ SHA256 = hashes.SHA256 SHA384 = hashes.SHA384 SHA512 = hashes.SHA512 def __init__(self, hash_alg): self.hash_alg = hash_alg def prepare_key(self, key): if isinstance(key, RSAPrivateKey) or \ isinstance(key, RSAPublicKey): return key if isinstance(key, string_types): key = force_bytes(key) try: if key.startswith(b'ssh-rsa'): key = load_ssh_public_key(key, backend=default_backend()) else: key = load_pem_private_key(key, password=None, backend=default_backend()) except ValueError: key = load_pem_public_key(key, backend=default_backend()) else: raise TypeError('Expecting a PEM-formatted key.') return key @staticmethod def to_jwk(key_obj): obj = None if getattr(key_obj, 'private_numbers', None): # Private key numbers = key_obj.private_numbers() obj = { 'kty': 'RSA', 'key_ops': ['sign'], 'n': force_unicode(to_base64url_uint(numbers.public_numbers.n)), 'e': force_unicode(to_base64url_uint(numbers.public_numbers.e)), 'd': force_unicode(to_base64url_uint(numbers.d)), 'p': force_unicode(to_base64url_uint(numbers.p)), 'q': force_unicode(to_base64url_uint(numbers.q)), 'dp': force_unicode(to_base64url_uint(numbers.dmp1)), 'dq': force_unicode(to_base64url_uint(numbers.dmq1)), 'qi': force_unicode(to_base64url_uint(numbers.iqmp)) } elif getattr(key_obj, 'verify', None): # Public key numbers = key_obj.public_numbers() obj = { 'kty': 'RSA', 'key_ops': ['verify'], 'n': force_unicode(to_base64url_uint(numbers.n)), 'e': force_unicode(to_base64url_uint(numbers.e)) } else: raise InvalidKeyError('Not a public or private key') return json.dumps(obj) @staticmethod def from_jwk(jwk): try: obj = json.loads(jwk) except ValueError: raise InvalidKeyError('Key is not valid JSON') if obj.get('kty') != 'RSA': raise InvalidKeyError('Not an RSA key') if 'd' in obj and 'e' in obj and 'n' in obj: # Private key if 'oth' in obj: raise InvalidKeyError('Unsupported RSA private key: > 2 primes not supported') other_props = ['p', 'q', 'dp', 'dq', 'qi'] props_found = [prop in obj for prop in other_props] any_props_found = any(props_found) if any_props_found and not all(props_found): raise InvalidKeyError('RSA key must include all parameters if any are present besides d') public_numbers = RSAPublicNumbers( from_base64url_uint(obj['e']), from_base64url_uint(obj['n']) ) if any_props_found: numbers = RSAPrivateNumbers( d=from_base64url_uint(obj['d']), p=from_base64url_uint(obj['p']), q=from_base64url_uint(obj['q']), dmp1=from_base64url_uint(obj['dp']), dmq1=from_base64url_uint(obj['dq']), iqmp=from_base64url_uint(obj['qi']), public_numbers=public_numbers ) else: d = from_base64url_uint(obj['d']) p, q = rsa_recover_prime_factors( public_numbers.n, d, public_numbers.e ) numbers = RSAPrivateNumbers( d=d, p=p, q=q, dmp1=rsa_crt_dmp1(d, p), dmq1=rsa_crt_dmq1(d, q), iqmp=rsa_crt_iqmp(p, q), public_numbers=public_numbers ) return numbers.private_key(default_backend()) elif 'n' in obj and 'e' in obj: # Public key numbers = RSAPublicNumbers( from_base64url_uint(obj['e']), from_base64url_uint(obj['n']) ) return numbers.public_key(default_backend()) else: raise InvalidKeyError('Not a public or private key') def sign(self, msg, key): return key.sign(msg, padding.PKCS1v15(), self.hash_alg()) def verify(self, msg, key, sig): try: key.verify(sig, msg, padding.PKCS1v15(), self.hash_alg()) return True except InvalidSignature: return False class ECAlgorithm(Algorithm): """ Performs signing and verification operations using ECDSA and the specified hash function """ SHA256 = hashes.SHA256 SHA384 = hashes.SHA384 SHA512 = hashes.SHA512 def __init__(self, hash_alg): self.hash_alg = hash_alg def prepare_key(self, key): if isinstance(key, EllipticCurvePrivateKey) or \ isinstance(key, EllipticCurvePublicKey): return key if isinstance(key, string_types): key = force_bytes(key) # Attempt to load key. We don't know if it's # a Signing Key or a Verifying Key, so we try # the Verifying Key first. try: if key.startswith(b'ecdsa-sha2-'): key = load_ssh_public_key(key, backend=default_backend()) else: key = load_pem_public_key(key, backend=default_backend()) except ValueError: key = load_pem_private_key(key, password=None, backend=default_backend()) else: raise TypeError('Expecting a PEM-formatted key.') return key def sign(self, msg, key): der_sig = key.sign(msg, ec.ECDSA(self.hash_alg())) return der_to_raw_signature(der_sig, key.curve) def verify(self, msg, key, sig): try: der_sig = raw_to_der_signature(sig, key.curve) except ValueError: return False try: key.verify(der_sig, msg, ec.ECDSA(self.hash_alg())) return True except InvalidSignature: return False class RSAPSSAlgorithm(RSAAlgorithm): """ Performs a signature using RSASSA-PSS with MGF1 """ def sign(self, msg, key): return key.sign( msg, padding.PSS( mgf=padding.MGF1(self.hash_alg()), salt_length=self.hash_alg.digest_size ), self.hash_alg() ) def verify(self, msg, key, sig): try: key.verify( sig, msg, padding.PSS( mgf=padding.MGF1(self.hash_alg()), salt_length=self.hash_alg.digest_size ), self.hash_alg() ) return True except InvalidSignature: return False