# Copyright (c) 2011 Sam Rushing # # key.py - OpenSSL wrapper # # This file is modified from python-bitcoinlib. # """ECC secp256k1 crypto routines WARNING: This module does not mlock() secrets; your private keys may end up on disk in swap! Use with caution! """ import ctypes import ctypes.util import hashlib import sys ssl = ctypes.cdll.LoadLibrary(ctypes.util.find_library ('ssl') or 'libeay32') ssl.BN_new.restype = ctypes.c_void_p ssl.BN_new.argtypes = [] ssl.BN_bin2bn.restype = ctypes.c_void_p ssl.BN_bin2bn.argtypes = [ctypes.c_char_p, ctypes.c_int, ctypes.c_void_p] ssl.BN_CTX_free.restype = None ssl.BN_CTX_free.argtypes = [ctypes.c_void_p] ssl.BN_CTX_new.restype = ctypes.c_void_p ssl.BN_CTX_new.argtypes = [] ssl.ECDH_compute_key.restype = ctypes.c_int ssl.ECDH_compute_key.argtypes = [ctypes.c_void_p, ctypes.c_int, ctypes.c_void_p, ctypes.c_void_p] ssl.ECDSA_sign.restype = ctypes.c_int ssl.ECDSA_sign.argtypes = [ctypes.c_int, ctypes.c_void_p, ctypes.c_int, ctypes.c_void_p, ctypes.c_void_p, ctypes.c_void_p] ssl.ECDSA_verify.restype = ctypes.c_int ssl.ECDSA_verify.argtypes = [ctypes.c_int, ctypes.c_void_p, ctypes.c_int, ctypes.c_void_p, ctypes.c_int, ctypes.c_void_p] ssl.EC_KEY_free.restype = None ssl.EC_KEY_free.argtypes = [ctypes.c_void_p] ssl.EC_KEY_new_by_curve_name.restype = ctypes.c_void_p ssl.EC_KEY_new_by_curve_name.argtypes = [ctypes.c_int] ssl.EC_KEY_get0_group.restype = ctypes.c_void_p ssl.EC_KEY_get0_group.argtypes = [ctypes.c_void_p] ssl.EC_KEY_get0_public_key.restype = ctypes.c_void_p ssl.EC_KEY_get0_public_key.argtypes = [ctypes.c_void_p] ssl.EC_KEY_set_private_key.restype = ctypes.c_int ssl.EC_KEY_set_private_key.argtypes = [ctypes.c_void_p, ctypes.c_void_p] ssl.EC_KEY_set_conv_form.restype = None ssl.EC_KEY_set_conv_form.argtypes = [ctypes.c_void_p, ctypes.c_int] ssl.EC_KEY_set_public_key.restype = ctypes.c_int ssl.EC_KEY_set_public_key.argtypes = [ctypes.c_void_p, ctypes.c_void_p] ssl.i2o_ECPublicKey.restype = ctypes.c_void_p ssl.i2o_ECPublicKey.argtypes = [ctypes.c_void_p, ctypes.c_void_p] ssl.EC_POINT_new.restype = ctypes.c_void_p ssl.EC_POINT_new.argtypes = [ctypes.c_void_p] ssl.EC_POINT_free.restype = None ssl.EC_POINT_free.argtypes = [ctypes.c_void_p] ssl.EC_POINT_mul.restype = ctypes.c_int ssl.EC_POINT_mul.argtypes = [ctypes.c_void_p, ctypes.c_void_p, ctypes.c_void_p, ctypes.c_void_p, ctypes.c_void_p, ctypes.c_void_p] # this specifies the curve used with ECDSA. NID_secp256k1 = 714 # from openssl/obj_mac.h # Thx to Sam Devlin for the ctypes magic 64-bit fix. def _check_result(val, func, args): if val == 0: raise ValueError else: return ctypes.c_void_p (val) ssl.EC_KEY_new_by_curve_name.restype = ctypes.c_void_p ssl.EC_KEY_new_by_curve_name.errcheck = _check_result class CECKey(object): """Wrapper around OpenSSL's EC_KEY""" POINT_CONVERSION_COMPRESSED = 2 POINT_CONVERSION_UNCOMPRESSED = 4 def __init__(self): self.k = ssl.EC_KEY_new_by_curve_name(NID_secp256k1) def __del__(self): if ssl: ssl.EC_KEY_free(self.k) self.k = None def set_secretbytes(self, secret): priv_key = ssl.BN_bin2bn(secret, 32, ssl.BN_new()) group = ssl.EC_KEY_get0_group(self.k) pub_key = ssl.EC_POINT_new(group) ctx = ssl.BN_CTX_new() if not ssl.EC_POINT_mul(group, pub_key, priv_key, None, None, ctx): raise ValueError("Could not derive public key from the supplied secret.") ssl.EC_POINT_mul(group, pub_key, priv_key, None, None, ctx) ssl.EC_KEY_set_private_key(self.k, priv_key) ssl.EC_KEY_set_public_key(self.k, pub_key) ssl.EC_POINT_free(pub_key) ssl.BN_CTX_free(ctx) return self.k def set_privkey(self, key): self.mb = ctypes.create_string_buffer(key) return ssl.d2i_ECPrivateKey(ctypes.byref(self.k), ctypes.byref(ctypes.pointer(self.mb)), len(key)) def set_pubkey(self, key): self.mb = ctypes.create_string_buffer(key) return ssl.o2i_ECPublicKey(ctypes.byref(self.k), ctypes.byref(ctypes.pointer(self.mb)), len(key)) def get_privkey(self): size = ssl.i2d_ECPrivateKey(self.k, 0) mb_pri = ctypes.create_string_buffer(size) ssl.i2d_ECPrivateKey(self.k, ctypes.byref(ctypes.pointer(mb_pri))) return mb_pri.raw def get_pubkey(self): size = ssl.i2o_ECPublicKey(self.k, 0) mb = ctypes.create_string_buffer(size) ssl.i2o_ECPublicKey(self.k, ctypes.byref(ctypes.pointer(mb))) return mb.raw def get_raw_ecdh_key(self, other_pubkey): ecdh_keybuffer = ctypes.create_string_buffer(32) r = ssl.ECDH_compute_key(ctypes.pointer(ecdh_keybuffer), 32, ssl.EC_KEY_get0_public_key(other_pubkey.k), self.k, 0) if r != 32: raise Exception('CKey.get_ecdh_key(): ECDH_compute_key() failed') return ecdh_keybuffer.raw def get_ecdh_key(self, other_pubkey, kdf=lambda k: hashlib.sha256(k).digest()): # FIXME: be warned it's not clear what the kdf should be as a default r = self.get_raw_ecdh_key(other_pubkey) return kdf(r) def sign(self, hash): # FIXME: need unit tests for below cases if not isinstance(hash, bytes): raise TypeError('Hash must be bytes instance; got %r' % hash.__class__) if len(hash) != 32: raise ValueError('Hash must be exactly 32 bytes long') sig_size0 = ctypes.c_uint32() sig_size0.value = ssl.ECDSA_size(self.k) mb_sig = ctypes.create_string_buffer(sig_size0.value) result = ssl.ECDSA_sign(0, hash, len(hash), mb_sig, ctypes.byref(sig_size0), self.k) assert 1 == result return mb_sig.raw[:sig_size0.value] def verify(self, hash, sig): """Verify a DER signature""" return ssl.ECDSA_verify(0, hash, len(hash), sig, len(sig), self.k) == 1 def set_compressed(self, compressed): if compressed: form = self.POINT_CONVERSION_COMPRESSED else: form = self.POINT_CONVERSION_UNCOMPRESSED ssl.EC_KEY_set_conv_form(self.k, form) class CPubKey(bytes): """An encapsulated public key Attributes: is_valid - Corresponds to CPubKey.IsValid() is_fullyvalid - Corresponds to CPubKey.IsFullyValid() is_compressed - Corresponds to CPubKey.IsCompressed() """ def __new__(cls, buf, _cec_key=None): self = super(CPubKey, cls).__new__(cls, buf) if _cec_key is None: _cec_key = CECKey() self._cec_key = _cec_key self.is_fullyvalid = _cec_key.set_pubkey(self) != 0 return self @property def is_valid(self): return len(self) > 0 @property def is_compressed(self): return len(self) == 33 def verify(self, hash, sig): return self._cec_key.verify(hash, sig) def __str__(self): return repr(self) def __repr__(self): # Always have represent as b'<secret>' so test cases don't have to # change for py2/3 if sys.version > '3': return '%s(%s)' % (self.__class__.__name__, super(CPubKey, self).__repr__()) else: return '%s(b%s)' % (self.__class__.__name__, super(CPubKey, self).__repr__())