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722 lines
21 KiB
722 lines
21 KiB
#!/usr/bin/env python
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import ctypes
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import json
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import os
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from binascii import hexlify, unhexlify
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import pytest
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from pyasn1.codec.ber.decoder import decode as ber_decode
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from pyasn1.codec.der.decoder import decode as der_decode
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from pyasn1.codec.der.encoder import encode as der_encode
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from pyasn1.type import namedtype, univ
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class EcSignature(univ.Sequence):
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componentType = namedtype.NamedTypes(
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namedtype.NamedType("r", univ.Integer()),
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namedtype.NamedType("s", univ.Integer()),
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)
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class EcKeyInfo(univ.Sequence):
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componentType = namedtype.NamedTypes(
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namedtype.NamedType("key_type", univ.ObjectIdentifier()),
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namedtype.NamedType("curve_name", univ.ObjectIdentifier()),
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)
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class EcPublicKey(univ.Sequence):
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componentType = namedtype.NamedTypes(
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namedtype.NamedType("key_info", EcKeyInfo()),
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namedtype.NamedType("public_key", univ.BitString()),
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)
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class EdKeyInfo(univ.Sequence):
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componentType = namedtype.NamedTypes(
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namedtype.NamedType("key_type", univ.ObjectIdentifier())
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)
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class EdPublicKey(univ.Sequence):
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componentType = namedtype.NamedTypes(
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namedtype.NamedType("key_info", EdKeyInfo()),
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namedtype.NamedType("public_key", univ.BitString()),
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)
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class ParseError(Exception):
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pass
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class NotSupported(Exception):
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pass
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class DataError(Exception):
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pass
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class curve_info(ctypes.Structure):
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_fields_ = [("bip32_name", ctypes.c_char_p), ("params", ctypes.c_void_p)]
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def keys_in_dict(dictionary, keys):
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return keys <= set(dictionary.keys())
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def parse_eddsa_signature(signature):
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if len(signature) != 64:
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raise ParseError("Not a valid EdDSA signature")
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return signature
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def parse_ecdh256_privkey(private_key):
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if private_key < 0 or private_key.bit_length() > 256:
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raise ParseError("Not a valid 256 bit ECDH private key")
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return private_key.to_bytes(32, byteorder="big")
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def parse_signed_hex(string):
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if len(string) % 2 == 1:
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string = "0" + string
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number = int(string, 16)
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if int(string[0], 16) & 8:
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return -number
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else:
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return number
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def parse_result(result):
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if result == "valid":
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return True
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elif result == "invalid":
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return False
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elif result == "acceptable":
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return None
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else:
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raise DataError()
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def is_valid_der(data):
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try:
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structure, _ = der_decode(data)
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return data == der_encode(structure)
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except Exception:
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return False
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def parse_ed_pubkey(public_key):
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try:
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public_key, _ = ber_decode(public_key, asn1Spec=EdPublicKey())
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except Exception:
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raise ParseError("Not a BER encoded Edwards curve public key")
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if not public_key["key_info"]["key_type"] == univ.ObjectIdentifier("1.3.101.112"):
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raise ParseError("Not a BER encoded Edwards curve public key")
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public_key = bytes(public_key["public_key"].asOctets())
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return public_key
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def parse_ec_pubkey(public_key):
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try:
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public_key, _ = ber_decode(public_key, asn1Spec=EcPublicKey())
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except Exception:
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raise ParseError("Not a BER encoded named elliptic curve public key")
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if not public_key["key_info"]["key_type"] == univ.ObjectIdentifier(
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"1.2.840.10045.2.1"
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):
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raise ParseError("Not a BER encoded named elliptic curve public key")
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curve_identifier = public_key["key_info"]["curve_name"]
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curve_name = get_curve_name_by_identifier(curve_identifier)
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if curve_name is None:
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raise NotSupported(
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"Unsupported named elliptic curve: {}".format(curve_identifier)
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)
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try:
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public_key = bytes(public_key["public_key"].asOctets())
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except Exception:
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raise ParseError("Not a BER encoded named elliptic curve public key")
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return curve_name, public_key
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def parse_ecdsa256_signature(signature):
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s = signature
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if not is_valid_der(signature):
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raise ParseError("Not a valid DER")
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try:
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signature, _ = der_decode(signature, asn1Spec=EcSignature())
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except Exception:
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raise ParseError("Not a valid DER encoded ECDSA signature")
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try:
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r = int(signature["r"]).to_bytes(32, byteorder="big")
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s = int(signature["s"]).to_bytes(32, byteorder="big")
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signature = r + s
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except Exception:
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raise ParseError("Not a valid DER encoded 256 bit ECDSA signature")
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return signature
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def parse_digest(name):
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if name == "SHA-256":
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return 0
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else:
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raise NotSupported("Unsupported hash function: {}".format(name))
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def get_curve_by_name(name):
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lib.get_curve_by_name.restype = ctypes.c_void_p
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curve = lib.get_curve_by_name(bytes(name, "ascii"))
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if curve is None:
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return None
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curve = ctypes.cast(curve, ctypes.POINTER(curve_info))
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return ctypes.c_void_p(curve.contents.params)
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def parse_curve_name(name):
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if name == "secp256r1":
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return "nist256p1"
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elif name == "secp256k1":
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return "secp256k1"
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elif name == "curve25519":
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return "curve25519"
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else:
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return None
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def get_curve_name_by_identifier(identifier):
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if identifier == univ.ObjectIdentifier("1.3.132.0.10"):
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return "secp256k1"
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elif identifier == univ.ObjectIdentifier("1.2.840.10045.3.1.7"):
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return "nist256p1"
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else:
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return None
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def chacha_poly_encrypt(key, iv, associated_data, plaintext):
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context = bytes(context_structure_length)
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tag = bytes(16)
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ciphertext = bytes(len(plaintext))
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lib.rfc7539_init(context, key, iv)
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lib.rfc7539_auth(context, associated_data, len(associated_data))
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lib.chacha20poly1305_encrypt(context, plaintext, ciphertext, len(plaintext))
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lib.rfc7539_finish(context, len(associated_data), len(plaintext), tag)
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return ciphertext, tag
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def chacha_poly_decrypt(key, iv, associated_data, ciphertext, tag):
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context = bytes(context_structure_length)
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computed_tag = bytes(16)
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plaintext = bytes(len(ciphertext))
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lib.rfc7539_init(context, key, iv)
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lib.rfc7539_auth(context, associated_data, len(associated_data))
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lib.chacha20poly1305_decrypt(context, ciphertext, plaintext, len(ciphertext))
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lib.rfc7539_finish(context, len(associated_data), len(ciphertext), computed_tag)
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return plaintext if tag == computed_tag else False
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def add_pkcs_padding(data):
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padding_length = 16 - len(data) % 16
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return data + bytes([padding_length] * padding_length)
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def remove_pkcs_padding(data):
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padding_length = data[-1]
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if not (
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0 < padding_length <= 16
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and data[-padding_length:] == bytes([padding_length] * padding_length)
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):
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return False
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else:
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return data[:-padding_length]
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def aes_encrypt_initialise(key, context):
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if len(key) == (128 / 8):
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lib.aes_encrypt_key128(key, context)
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elif len(key) == (192 / 8):
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lib.aes_encrypt_key192(key, context)
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elif len(key) == (256 / 8):
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lib.aes_encrypt_key256(key, context)
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else:
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raise NotSupported("Unsupported key length: {}".format(len(key) * 8))
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def aes_cbc_encrypt(key, iv, plaintext):
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plaintext = add_pkcs_padding(plaintext)
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context = bytes(context_structure_length)
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ciphertext = bytes(len(plaintext))
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aes_encrypt_initialise(key, context)
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lib.aes_cbc_encrypt(
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plaintext, ciphertext, len(plaintext), bytes(bytearray(iv)), context
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)
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return ciphertext
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def aes_decrypt_initialise(key, context):
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if len(key) == (128 / 8):
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lib.aes_decrypt_key128(key, context)
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elif len(key) == (192 / 8):
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lib.aes_decrypt_key192(key, context)
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elif len(key) == (256 / 8):
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lib.aes_decrypt_key256(key, context)
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else:
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raise NotSupported("Unsupported AES key length: {}".format(len(key) * 8))
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def aes_cbc_decrypt(key, iv, ciphertext):
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context = bytes(context_structure_length)
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plaintext = bytes(len(ciphertext))
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aes_decrypt_initialise(key, context)
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lib.aes_cbc_decrypt(ciphertext, plaintext, len(ciphertext), iv, context)
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return remove_pkcs_padding(plaintext)
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def load_json_testvectors(filename):
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try:
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result = json.loads(open(os.path.join(testvectors_directory, filename)).read())
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except Exception:
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raise DataError()
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return result
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def generate_aes(filename):
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vectors = []
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data = load_json_testvectors(filename)
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if not keys_in_dict(data, {"algorithm", "testGroups"}):
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raise DataError()
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if data["algorithm"] != "AES-CBC-PKCS5":
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raise DataError()
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for test_group in data["testGroups"]:
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if not keys_in_dict(test_group, {"tests"}):
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raise DataError()
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for test in test_group["tests"]:
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if not keys_in_dict(test, {"key", "iv", "msg", "ct", "result"}):
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raise DataError()
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try:
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key = unhexlify(test["key"])
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iv = unhexlify(test["iv"])
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plaintext = unhexlify(test["msg"])
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ciphertext = unhexlify(test["ct"])
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result = parse_result(test["result"])
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except Exception:
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raise DataError()
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if len(key) not in [128 / 8, 192 / 8, 256 / 8]:
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continue
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if result is None:
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continue
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vectors.append(
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(
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hexlify(key),
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hexlify(iv),
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hexlify(plaintext),
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hexlify(ciphertext),
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result,
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)
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)
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return vectors
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def generate_chacha_poly(filename):
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vectors = []
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data = load_json_testvectors(filename)
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if not keys_in_dict(data, {"algorithm", "testGroups"}):
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raise DataError()
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if data["algorithm"] != "CHACHA20-POLY1305":
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raise DataError()
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for test_group in data["testGroups"]:
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if not keys_in_dict(test_group, {"tests"}):
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raise DataError()
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for test in test_group["tests"]:
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if not keys_in_dict(
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test, {"key", "iv", "aad", "msg", "ct", "tag", "result"}
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):
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raise DataError()
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try:
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key = unhexlify(test["key"])
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iv = unhexlify(test["iv"])
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associated_data = unhexlify(test["aad"])
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plaintext = unhexlify(test["msg"])
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ciphertext = unhexlify(test["ct"])
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tag = unhexlify(test["tag"])
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result = parse_result(test["result"])
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except Exception:
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raise DataError()
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if result is None:
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continue
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vectors.append(
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(
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hexlify(key),
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hexlify(iv),
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hexlify(associated_data),
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hexlify(plaintext),
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hexlify(ciphertext),
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hexlify(tag),
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result,
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)
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)
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return vectors
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def generate_curve25519_dh(filename):
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vectors = []
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data = load_json_testvectors(filename)
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if not keys_in_dict(data, {"algorithm", "testGroups"}):
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raise DataError()
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if data["algorithm"] != "X25519":
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raise DataError()
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for test_group in data["testGroups"]:
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if not keys_in_dict(test_group, {"tests"}):
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raise DataError()
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for test in test_group["tests"]:
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if not keys_in_dict(
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test, {"public", "private", "shared", "result", "curve"}
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):
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raise DataError()
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try:
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public_key = unhexlify(test["public"])
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curve_name = parse_curve_name(test["curve"])
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private_key = unhexlify(test["private"])
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shared = unhexlify(test["shared"])
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result = parse_result(test["result"])
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except Exception:
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raise DataError()
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if curve_name != "curve25519":
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continue
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if result is None:
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continue
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vectors.append(
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(hexlify(public_key), hexlify(private_key), hexlify(shared), result)
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)
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return vectors
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def generate_ecdh(filename):
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vectors = []
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data = load_json_testvectors(filename)
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if not keys_in_dict(data, {"algorithm", "testGroups"}):
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raise DataError()
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if data["algorithm"] != "ECDH":
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raise DataError()
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for test_group in data["testGroups"]:
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if not keys_in_dict(test_group, {"tests"}):
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raise DataError()
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for test in test_group["tests"]:
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if not keys_in_dict(
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test, {"public", "private", "shared", "result", "curve"}
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):
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raise DataError()
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try:
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public_key = unhexlify(test["public"])
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curve_name = parse_curve_name(test["curve"])
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private_key = parse_signed_hex(test["private"])
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shared = unhexlify(test["shared"])
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result = parse_result(test["result"])
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except Exception:
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raise DataError()
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try:
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private_key = parse_ecdh256_privkey(private_key)
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except ParseError:
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continue
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try:
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key_curve_name, public_key = parse_ec_pubkey(public_key)
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except NotSupported:
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continue
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except ParseError:
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continue
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if key_curve_name != curve_name:
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continue
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if result is None:
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continue
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vectors.append(
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(
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curve_name,
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hexlify(public_key),
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hexlify(private_key),
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hexlify(shared),
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result,
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)
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)
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return vectors
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def generate_ecdsa(filename):
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vectors = []
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data = load_json_testvectors(filename)
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if not keys_in_dict(data, {"algorithm", "testGroups"}):
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raise DataError()
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if data["algorithm"] != "ECDSA":
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raise DataError()
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for test_group in data["testGroups"]:
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if not keys_in_dict(test_group, {"tests", "keyDer", "sha"}):
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raise DataError()
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try:
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public_key = unhexlify(test_group["keyDer"])
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except Exception:
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raise DataError()
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try:
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curve_name, public_key = parse_ec_pubkey(public_key)
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except NotSupported:
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continue
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except ParseError:
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continue
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try:
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hasher = parse_digest(test_group["sha"])
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except NotSupported:
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continue
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for test in test_group["tests"]:
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if not keys_in_dict(test, {"sig", "msg", "result"}):
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raise DataError()
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try:
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signature = unhexlify(test["sig"])
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message = unhexlify(test["msg"])
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result = parse_result(test["result"])
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except Exception:
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raise DataError()
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if result is None:
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continue
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try:
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signature = parse_ecdsa256_signature(signature)
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except ParseError:
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continue
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vectors.append(
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(
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curve_name,
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hexlify(public_key),
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hasher,
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hexlify(message),
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hexlify(signature),
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result,
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)
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)
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return vectors
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def generate_eddsa(filename):
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vectors = []
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data = load_json_testvectors(filename)
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if not keys_in_dict(data, {"algorithm", "testGroups"}):
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raise DataError()
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if data["algorithm"] != "EDDSA":
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raise DataError()
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for test_group in data["testGroups"]:
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if not keys_in_dict(test_group, {"tests", "keyDer"}):
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raise DataError()
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try:
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public_key = unhexlify(test_group["keyDer"])
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except Exception:
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raise DataError()
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try:
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public_key = parse_ed_pubkey(public_key)
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except ParseError:
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continue
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|
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for test in test_group["tests"]:
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|
if not keys_in_dict(test, {"sig", "msg", "result"}):
|
|
raise DataError()
|
|
|
|
try:
|
|
signature = unhexlify(test["sig"])
|
|
message = unhexlify(test["msg"])
|
|
result = parse_result(test["result"])
|
|
except Exception:
|
|
raise DataError()
|
|
|
|
if result is None:
|
|
continue
|
|
|
|
try:
|
|
signature = parse_eddsa_signature(signature)
|
|
except ParseError:
|
|
continue
|
|
|
|
vectors.append(
|
|
(hexlify(public_key), hexlify(message), hexlify(signature), result)
|
|
)
|
|
|
|
return vectors
|
|
|
|
|
|
dir = os.path.abspath(os.path.dirname(__file__))
|
|
lib = ctypes.cdll.LoadLibrary(os.path.join(dir, "libtrezor-crypto.so"))
|
|
testvectors_directory = os.path.join(dir, "wycheproof/testvectors")
|
|
context_structure_length = 1024
|
|
|
|
ecdh_vectors = generate_ecdh("ecdh_test.json")
|
|
curve25519_dh_vectors = generate_curve25519_dh("x25519_test.json")
|
|
eddsa_vectors = generate_eddsa("eddsa_test.json")
|
|
ecdsa_vectors = (
|
|
generate_ecdsa("ecdsa_test.json")
|
|
+ generate_ecdsa("ecdsa_secp256k1_sha256_test.json")
|
|
+ generate_ecdsa("ecdsa_secp256r1_sha256_test.json")
|
|
)
|
|
ecdh_vectors = (
|
|
generate_ecdh("ecdh_test.json")
|
|
+ generate_ecdh("ecdh_secp256k1_test.json")
|
|
+ generate_ecdh("ecdh_secp256r1_test.json")
|
|
)
|
|
chacha_poly_vectors = generate_chacha_poly("chacha20_poly1305_test.json")
|
|
aes_vectors = generate_aes("aes_cbc_pkcs5_test.json")
|
|
|
|
|
|
@pytest.mark.parametrize("public_key, message, signature, result", eddsa_vectors)
|
|
def test_eddsa(public_key, message, signature, result):
|
|
public_key = unhexlify(public_key)
|
|
signature = unhexlify(signature)
|
|
message = unhexlify(message)
|
|
|
|
computed_result = (
|
|
lib.ed25519_sign_open(message, len(message), public_key, signature) == 0
|
|
)
|
|
assert result == computed_result
|
|
|
|
|
|
@pytest.mark.parametrize(
|
|
"curve_name, public_key, hasher, message, signature, result", ecdsa_vectors
|
|
)
|
|
def test_ecdsa(curve_name, public_key, hasher, message, signature, result):
|
|
curve = get_curve_by_name(curve_name)
|
|
if curve is None:
|
|
raise NotSupported("Curve not supported: {}".format(curve_name))
|
|
|
|
public_key = unhexlify(public_key)
|
|
signature = unhexlify(signature)
|
|
message = unhexlify(message)
|
|
|
|
computed_result = (
|
|
lib.ecdsa_verify(curve, hasher, public_key, signature, message, len(message))
|
|
== 0
|
|
)
|
|
assert result == computed_result
|
|
|
|
|
|
@pytest.mark.parametrize(
|
|
"public_key, private_key, shared, result", curve25519_dh_vectors
|
|
)
|
|
def test_curve25519_dh(public_key, private_key, shared, result):
|
|
public_key = unhexlify(public_key)
|
|
private_key = unhexlify(private_key)
|
|
shared = unhexlify(shared)
|
|
|
|
computed_shared = bytes([0] * 32)
|
|
lib.curve25519_scalarmult(computed_shared, private_key, public_key)
|
|
computed_result = shared == computed_shared
|
|
assert result == computed_result
|
|
|
|
|
|
@pytest.mark.parametrize(
|
|
"curve_name, public_key, private_key, shared, result", ecdh_vectors
|
|
)
|
|
def test_ecdh(curve_name, public_key, private_key, shared, result):
|
|
curve = get_curve_by_name(curve_name)
|
|
if curve is None:
|
|
raise NotSupported("Curve not supported: {}".format(curve_name))
|
|
|
|
public_key = unhexlify(public_key)
|
|
private_key = unhexlify(private_key)
|
|
shared = unhexlify(shared)
|
|
|
|
computed_shared = bytes([0] * 2 * 32)
|
|
lib.ecdh_multiply(curve, private_key, public_key, computed_shared)
|
|
computed_shared = computed_shared[1:33]
|
|
computed_result = shared == computed_shared
|
|
assert result == computed_result
|
|
|
|
|
|
@pytest.mark.parametrize(
|
|
"key, iv, associated_data, plaintext, ciphertext, tag, result", chacha_poly_vectors
|
|
)
|
|
def test_chacha_poly(key, iv, associated_data, plaintext, ciphertext, tag, result):
|
|
key = unhexlify(key)
|
|
iv = unhexlify(iv)
|
|
associated_data = unhexlify(associated_data)
|
|
plaintext = unhexlify(plaintext)
|
|
ciphertext = unhexlify(ciphertext)
|
|
tag = unhexlify(tag)
|
|
|
|
computed_ciphertext, computed_tag = chacha_poly_encrypt(
|
|
key, iv, associated_data, plaintext
|
|
)
|
|
computed_result = ciphertext == computed_ciphertext and tag == computed_tag
|
|
assert result == computed_result
|
|
|
|
computed_plaintext = chacha_poly_decrypt(key, iv, associated_data, ciphertext, tag)
|
|
computed_result = plaintext == computed_plaintext
|
|
assert result == computed_result
|
|
|
|
|
|
@pytest.mark.parametrize("key, iv, plaintext, ciphertext, result", aes_vectors)
|
|
def test_aes(key, iv, plaintext, ciphertext, result):
|
|
key = unhexlify(key)
|
|
iv = unhexlify(iv)
|
|
plaintext = unhexlify(plaintext)
|
|
ciphertext = unhexlify(ciphertext)
|
|
|
|
computed_ciphertext = aes_cbc_encrypt(key, iv, plaintext)
|
|
computed_result = ciphertext == computed_ciphertext
|
|
assert result == computed_result
|
|
|
|
computed_plaintext = aes_cbc_decrypt(key, bytes(iv), ciphertext)
|
|
computed_result = plaintext == computed_plaintext
|
|
assert result == computed_result
|