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# coding: utf-8 from __future__ import unicode_literals, division, absolute_import, print_function import sys from .. import ffi from ._decode import _try_decode from ..errors import SignatureError from .._ffi import new, unwrap, null from .._types import str_cls if ffi() == 'cffi': from ._advapi32_cffi import advapi32, get_error else: from ._advapi32_ctypes import advapi32, get_error __all__ = [ 'advapi32', 'Advapi32Const', 'handle_error', ] _gwv = sys.getwindowsversion() _win_version_info = (_gwv[0], _gwv[1]) def open_context_handle(provider, verify_only=True): if provider == Advapi32Const.MS_ENH_RSA_AES_PROV: provider_type = Advapi32Const.PROV_RSA_AES elif provider == Advapi32Const.MS_ENH_DSS_DH_PROV: provider_type = Advapi32Const.PROV_DSS_DH else: raise ValueError('Invalid provider specified: %s' % provider) # The DSS provider needs a container to allow importing and exporting # private keys, but all of the RSA stuff works fine with CRYPT_VERIFYCONTEXT if verify_only or provider != Advapi32Const.MS_ENH_DSS_DH_PROV: container_name = null() flags = Advapi32Const.CRYPT_VERIFYCONTEXT else: container_name = Advapi32Const.CONTAINER_NAME flags = Advapi32Const.CRYPT_NEWKEYSET context_handle_pointer = new(advapi32, 'HCRYPTPROV *') res = advapi32.CryptAcquireContextW( context_handle_pointer, container_name, provider, provider_type, flags ) # If using the DSS provider and the container exists, just open it if not res and get_error()[0] == Advapi32Const.NTE_EXISTS: res = advapi32.CryptAcquireContextW( context_handle_pointer, container_name, provider, provider_type, 0 ) handle_error(res) return unwrap(context_handle_pointer) def close_context_handle(handle): res = advapi32.CryptReleaseContext(handle, 0) handle_error(res) def handle_error(result): """ Extracts the last Windows error message into a python unicode string :param result: A function result, 0 or None indicates failure :return: A unicode string error message """ if result: return code, error_string = get_error() if code == Advapi32Const.NTE_BAD_SIGNATURE: raise SignatureError('Signature is invalid') if not isinstance(error_string, str_cls): error_string = _try_decode(error_string) raise OSError(error_string) class Advapi32Const(): # Name we give to a container used to make DSA private key import/export work CONTAINER_NAME = 'oscrypto temporary DSS keyset' PROV_RSA_AES = 24 PROV_DSS_DH = 13 X509_PUBLIC_KEY_INFO = 8 PKCS_PRIVATE_KEY_INFO = 44 X509_DSS_SIGNATURE = 40 CRYPT_NO_SALT = 0x00000010 MS_ENH_DSS_DH_PROV = "Microsoft Enhanced DSS and Diffie-Hellman Cryptographic Provider" # This is the name for Windows Server 2003 and newer and Windows Vista and newer MS_ENH_RSA_AES_PROV = "Microsoft Enhanced RSA and AES Cryptographic Provider" CRYPT_EXPORTABLE = 1 CRYPT_NEWKEYSET = 0x00000008 CRYPT_VERIFYCONTEXT = 0xF0000000 CALG_MD5 = 0x00008003 CALG_SHA1 = 0x00008004 CALG_SHA_256 = 0x0000800c CALG_SHA_384 = 0x0000800d CALG_SHA_512 = 0x0000800e CALG_RC2 = 0x00006602 CALG_RC4 = 0x00006801 CALG_DES = 0x00006601 CALG_3DES_112 = 0x00006609 CALG_3DES = 0x00006603 CALG_AES_128 = 0x0000660e CALG_AES_192 = 0x0000660f CALG_AES_256 = 0x00006610 CALG_DSS_SIGN = 0x00002200 CALG_RSA_SIGN = 0x00002400 CALG_RSA_KEYX = 0x0000a400 CRYPT_MODE_CBC = 1 PKCS5_PADDING = 1 CUR_BLOB_VERSION = 2 PUBLICKEYBLOB = 6 PRIVATEKEYBLOB = 7 PLAINTEXTKEYBLOB = 8 KP_IV = 1 KP_PADDING = 3 KP_MODE = 4 KP_EFFECTIVE_KEYLEN = 19 CRYPT_OAEP = 0x00000040 NTE_BAD_SIGNATURE = -2146893818 # 0x80090006 NTE_EXISTS = -2146893809 # 0x8009000F AT_SIGNATURE = 2 RSA1 = 0x31415352 RSA2 = 0x32415352 DSS1 = 0x31535344 DSS2 = 0x32535344 if _win_version_info == (5, 1): # This is the Windows XP name for the provider Advapi32Const.MS_ENH_RSA_AES_PROV = "Microsoft Enhanced RSA and AES Cryptographic Provider (Prototype)"
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