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Code Issues Releases Wiki Activity

move openssl version checks to staticmethod requirements_check

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This commit is contained in:
Thomas Waldmann 2016-09-07 17:37:37 +02:00
parent 23959eb5bf
commit f34092e567
1 changed files with 26 additions and 3 deletions
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29
src/borg/crypto/low_level.pyx
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@ -253,7 +253,13 @@ cdef class AES256_CTR_HMAC_SHA256:
cdef unsigned char iv[16]
cdef long long blocks
@staticmethod
def requirements_check():
if OPENSSL_VERSION_NUMBER < 0x10000000:
raise ValueError('AES CTR requires OpenSSL >= 1.0.0. Detected: OpenSSL %08x' % OPENSSL_VERSION_NUMBER)
def __init__(self, mac_key, enc_key, iv=None, header_len=1, aad_offset=1):
self.requirements_check()
assert isinstance(mac_key, bytes) and len(mac_key) == 32
assert isinstance(enc_key, bytes) and len(enc_key) == 32
self.cipher_blk_len = 16
@ -428,6 +434,11 @@ cdef class _AEAD_BASE:
cdef unsigned char iv[12]
cdef long long blocks
@staticmethod
def requirements_check():
"""check whether library requirements for this ciphersuite are satisfied"""
raise NotImplemented # override / implement in child class
def __init__(self, mac_key, enc_key, iv=None, header_len=1, aad_offset=1):
assert mac_key is None
assert isinstance(enc_key, bytes) and len(enc_key) == 32
@ -606,25 +617,37 @@ cdef class _CHACHA_BASE(_AEAD_BASE):
cdef class AES256_GCM(_AES_BASE):
def __init__(self, mac_key, enc_key, iv=None, header_len=1, aad_offset=1):
@staticmethod
def requirements_check():
if OPENSSL_VERSION_NUMBER < 0x10001040:
raise ValueError('AES GCM requires OpenSSL >= 1.0.1d. Detected: OpenSSL %08x' % OPENSSL_VERSION_NUMBER)
def __init__(self, mac_key, enc_key, iv=None, header_len=1, aad_offset=1):
self.requirements_check()
self.cipher = EVP_aes_256_gcm
super().__init__(mac_key, enc_key, iv=iv, header_len=header_len, aad_offset=aad_offset)
cdef class AES256_OCB(_AES_BASE):
def __init__(self, mac_key, enc_key, iv=None, header_len=1, aad_offset=1):
@staticmethod
def requirements_check():
if OPENSSL_VERSION_NUMBER < 0x10100000:
raise ValueError('AES OCB requires OpenSSL >= 1.1.0. Detected: OpenSSL %08x' % OPENSSL_VERSION_NUMBER)
def __init__(self, mac_key, enc_key, iv=None, header_len=1, aad_offset=1):
self.requirements_check()
self.cipher = EVP_aes_256_ocb
super().__init__(mac_key, enc_key, iv=iv, header_len=header_len, aad_offset=aad_offset)
cdef class CHACHA20_POLY1305(_CHACHA_BASE):
def __init__(self, mac_key, enc_key, iv=None, header_len=1, aad_offset=1):
@staticmethod
def requirements_check():
if OPENSSL_VERSION_NUMBER < 0x10100000:
raise ValueError('CHACHA20-POLY1305 requires OpenSSL >= 1.1.0. Detected: OpenSSL %08x' % OPENSSL_VERSION_NUMBER)
def __init__(self, mac_key, enc_key, iv=None, header_len=1, aad_offset=1):
self.requirements_check()
self.cipher = EVP_chacha20_poly1305
super().__init__(mac_key, enc_key, iv=iv, header_len=header_len, aad_offset=aad_offset)