def pbkdf2_hmac(space, name, password, salt, rounds, w_dklen):
digest = ropenssl.EVP_get_digestbyname(name)
if not digest:
raise oefmt(space.w_ValueError, "unknown hash function")
if space.is_w(w_dklen, space.w_None):
dklen = ropenssl.EVP_MD_size(digest)
else:
dklen = space.int_w(w_dklen)
if dklen < 1:
raise oefmt(space.w_ValueError,
"key length must be greater than 0.")
with rffi.scoped_alloc_buffer(dklen) as buf:
r = ropenssl.PKCS5_PBKDF2_HMAC(password, len(password), salt,
len(salt), rounds, digest, dklen,
buf.raw)
if not r:
raise ValueError
return space.newbytes(buf.str(dklen))
def digest_type_by_name(self, space):
digest_type = ropenssl.EVP_get_digestbyname(self.name)
if not digest_type:
raise oefmt(space.w_ValueError, "unknown hash function")
return digest_type
def digest_type_by_name(self, space):
digest_type = ropenssl.EVP_get_digestbyname(self.name)
if not digest_type:
raise OperationError(space.w_ValueError,
space.wrap("unknown hash function"))
return digest_type