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crypto: use pointer to cipher context

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this is one of the steps needed to make borg compatible to openssl 1.1.
This commit is contained in:
Thomas Waldmann 2016-06-20 23:40:30 +02:00
parent 195a6b9093
commit a19c9861bf
1 changed files with 13 additions and 13 deletions
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26
borg/crypto.pyx
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@ -21,8 +21,8 @@ cdef extern from "openssl/evp.h":
ctypedef struct ENGINE:
pass
const EVP_CIPHER *EVP_aes_256_ctr()
void EVP_CIPHER_CTX_init(EVP_CIPHER_CTX *a)
void EVP_CIPHER_CTX_cleanup(EVP_CIPHER_CTX *a)
EVP_CIPHER_CTX *EVP_CIPHER_CTX_new()
void EVP_CIPHER_CTX_free(EVP_CIPHER_CTX *a)
int EVP_EncryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, ENGINE *impl,
const unsigned char *key, const unsigned char *iv)
@ -56,24 +56,24 @@ def num_aes_blocks(int length):
cdef class AES:
"""A thin wrapper around the OpenSSL EVP cipher API
"""
cdef EVP_CIPHER_CTX ctx
cdef EVP_CIPHER_CTX *ctx
cdef int is_encrypt
def __cinit__(self, is_encrypt, key, iv=None):
EVP_CIPHER_CTX_init(&self.ctx)
self.ctx = EVP_CIPHER_CTX_new()
self.is_encrypt = is_encrypt
# Set cipher type and mode
cipher_mode = EVP_aes_256_ctr()
if self.is_encrypt:
if not EVP_EncryptInit_ex(&self.ctx, cipher_mode, NULL, NULL, NULL):
if not EVP_EncryptInit_ex(self.ctx, cipher_mode, NULL, NULL, NULL):
raise Exception('EVP_EncryptInit_ex failed')
else: # decrypt
if not EVP_DecryptInit_ex(&self.ctx, cipher_mode, NULL, NULL, NULL):
if not EVP_DecryptInit_ex(self.ctx, cipher_mode, NULL, NULL, NULL):
raise Exception('EVP_DecryptInit_ex failed')
self.reset(key, iv)
def __dealloc__(self):
EVP_CIPHER_CTX_cleanup(&self.ctx)
EVP_CIPHER_CTX_free(self.ctx)
def reset(self, key=None, iv=None):
cdef const unsigned char *key2 = NULL
@ -84,10 +84,10 @@ cdef class AES:
iv2 = iv
# Initialise key and IV
if self.is_encrypt:
if not EVP_EncryptInit_ex(&self.ctx, NULL, NULL, key2, iv2):
if not EVP_EncryptInit_ex(self.ctx, NULL, NULL, key2, iv2):
raise Exception('EVP_EncryptInit_ex failed')
else: # decrypt
if not EVP_DecryptInit_ex(&self.ctx, NULL, NULL, key2, iv2):
if not EVP_DecryptInit_ex(self.ctx, NULL, NULL, key2, iv2):
raise Exception('EVP_DecryptInit_ex failed')
@property
@ -103,10 +103,10 @@ cdef class AES:
if not out:
raise MemoryError
try:
if not EVP_EncryptUpdate(&self.ctx, out, &outl, data, inl):
if not EVP_EncryptUpdate(self.ctx, out, &outl, data, inl):
raise Exception('EVP_EncryptUpdate failed')
ctl = outl
if not EVP_EncryptFinal_ex(&self.ctx, out+ctl, &outl):
if not EVP_EncryptFinal_ex(self.ctx, out+ctl, &outl):
raise Exception('EVP_EncryptFinal failed')
ctl += outl
return out[:ctl]
@ -124,10 +124,10 @@ cdef class AES:
if not out:
raise MemoryError
try:
if not EVP_DecryptUpdate(&self.ctx, out, &outl, data, inl):
if not EVP_DecryptUpdate(self.ctx, out, &outl, data, inl):
raise Exception('EVP_DecryptUpdate failed')
ptl = outl
if EVP_DecryptFinal_ex(&self.ctx, out+ptl, &outl) <= 0:
if EVP_DecryptFinal_ex(self.ctx, out+ptl, &outl) <= 0:
# this error check is very important for modes with padding or
# authentication. for them, a failure here means corrupted data.
# CTR mode does not use padding nor authentication.