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bpo-38153: Normalize hashlib algorithm names (GH-16083) 

Signed-off-by: Christian Heimes <christian@python.org>
This commit is contained in:
Christian Heimes 2019-09-13 15:31:19 +02:00 committed by Gregory P. Smith
parent 375a3e2bdb
commit 995b5d38e7
4 changed files with 179 additions and 32 deletions
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29
Lib/hashlib.py
View File

@ -70,37 +70,44 @@ __all__ = __always_supported + ('new', 'algorithms_guaranteed',
__builtin_constructor_cache = {}
__block_openssl_constructor = {
'sha3_224', 'sha3_256', 'sha3_384', 'sha3_512',
'shake_128', 'shake_256',
'blake2b', 'blake2s',
}
def __get_builtin_constructor(name):
cache = __builtin_constructor_cache
constructor = cache.get(name)
if constructor is not None:
return constructor
try:
if name in ('SHA1', 'sha1'):
if name in {'SHA1', 'sha1'}:
import _sha1
cache['SHA1'] = cache['sha1'] = _sha1.sha1
elif name in ('MD5', 'md5'):
elif name in {'MD5', 'md5'}:
import _md5
cache['MD5'] = cache['md5'] = _md5.md5
elif name in ('SHA256', 'sha256', 'SHA224', 'sha224'):
elif name in {'SHA256', 'sha256', 'SHA224', 'sha224'}:
import _sha256
cache['SHA224'] = cache['sha224'] = _sha256.sha224
cache['SHA256'] = cache['sha256'] = _sha256.sha256
elif name in ('SHA512', 'sha512', 'SHA384', 'sha384'):
elif name in {'SHA512', 'sha512', 'SHA384', 'sha384'}:
import _sha512
cache['SHA384'] = cache['sha384'] = _sha512.sha384
cache['SHA512'] = cache['sha512'] = _sha512.sha512
elif name in ('blake2b', 'blake2s'):
elif name in {'blake2b', 'blake2s'}:
import _blake2
cache['blake2b'] = _blake2.blake2b
cache['blake2s'] = _blake2.blake2s
elif name in {'sha3_224', 'sha3_256', 'sha3_384', 'sha3_512',
'shake_128', 'shake_256'}:
elif name in {'sha3_224', 'sha3_256', 'sha3_384', 'sha3_512'}:
import _sha3
cache['sha3_224'] = _sha3.sha3_224
cache['sha3_256'] = _sha3.sha3_256
cache['sha3_384'] = _sha3.sha3_384
cache['sha3_512'] = _sha3.sha3_512
elif name in {'shake_128', 'shake_256'}:
import _sha3
cache['shake_128'] = _sha3.shake_128
cache['shake_256'] = _sha3.shake_256
except ImportError:
@ -114,8 +121,8 @@ def __get_builtin_constructor(name):
def __get_openssl_constructor(name):
if name in {'blake2b', 'blake2s'}:
# Prefer our blake2 implementation.
if name in __block_openssl_constructor:
# Prefer our blake2 and sha3 implementation.
return __get_builtin_constructor(name)
try:
f = getattr(_hashlib, 'openssl_' + name)
@ -140,8 +147,8 @@ def __hash_new(name, data=b'', **kwargs):
"""new(name, data=b'') - Return a new hashing object using the named algorithm;
optionally initialized with data (which must be a bytes-like object).
"""
if name in {'blake2b', 'blake2s'}:
# Prefer our blake2 implementation.
if name in __block_openssl_constructor:
# Prefer our blake2 and sha3 implementation
# OpenSSL 1.1.0 comes with a limited implementation of blake2b/s.
# It does neither support keyed blake2 nor advanced features like
# salt, personal, tree hashing or SSE.

12
Lib/test/test_hashlib.py
View File

@ -26,6 +26,11 @@ COMPILED_WITH_PYDEBUG = hasattr(sys, 'gettotalrefcount')
c_hashlib = import_fresh_module('hashlib', fresh=['_hashlib'])
py_hashlib = import_fresh_module('hashlib', blocked=['_hashlib'])
try:
from _hashlib import HASH
except ImportError:
HASH = None
try:
import _blake2
except ImportError:
@ -386,6 +391,9 @@ class HashLibTestCase(unittest.TestCase):
constructors = self.constructors_to_test[name]
for hash_object_constructor in constructors:
m = hash_object_constructor()
if HASH is not None and isinstance(m, HASH):
# _hashopenssl's variant does not have extra SHA3 attributes
continue
self.assertEqual(capacity + rate, 1600)
self.assertEqual(m._capacity_bits, capacity)
self.assertEqual(m._rate_bits, rate)
@ -985,6 +993,10 @@ class KDFTests(unittest.TestCase):
hashlib.scrypt(b'password', salt=b'salt', n=2, r=8, p=1,
dklen=dklen)
def test_normalized_name(self):
self.assertNotIn("blake2b512", hashlib.algorithms_available)
self.assertNotIn("sha3-512", hashlib.algorithms_available)
if __name__ == "__main__":
unittest.main()

3
Misc/NEWS.d/next/Library/2019-09-13-12-18-51.bpo-38153.nHAbuJ.rst Normal file
View File

@ -0,0 +1,3 @@
Names of hashing algorithms frome OpenSSL are now normalized to follow
Python's naming conventions. For example OpenSSL uses sha3-512 instead of
sha3_512 or blake2b512 instead of blake2b.

167
Modules/_hashopenssl.c
View File

@ -34,6 +34,14 @@
#define MUNCH_SIZE INT_MAX
#if defined(NID_sha3_224) && defined(EVP_MD_FLAG_XOF)
#define PY_OPENSSL_HAS_SHA3 1
#endif
#ifdef NID_blake2b512
#define PY_OPENSSL_HAS_BLAKE2 1
#endif
typedef struct {
PyObject_HEAD
EVP_MD_CTX *ctx; /* OpenSSL message digest context */
@ -82,6 +90,135 @@ _setException(PyObject *exc)
}
/* LCOV_EXCL_STOP */
static PyObject*
py_digest_name(const EVP_MD *md)
{
int nid = EVP_MD_nid(md);
const char *name = NULL;
/* Hard-coded names for well-known hashing algorithms.
* OpenSSL uses slightly different names algorithms like SHA3.
*/
switch (nid) {
case NID_md5:
name = "md5";
break;
case NID_sha1:
name = "sha1";
break;
case NID_sha224:
name ="sha224";
break;
case NID_sha256:
name ="sha256";
break;
case NID_sha384:
name ="sha384";
break;
case NID_sha512:
name ="sha512";
break;
#ifdef NID_sha512_224
case NID_sha512_224:
name ="sha512_224";
break;
case NID_sha512_256:
name ="sha512_256";
break;
#endif
#ifdef PY_OPENSSL_HAS_SHA3
case NID_sha3_224:
name ="sha3_224";
break;
case NID_sha3_256:
name ="sha3_256";
break;
case NID_sha3_384:
name ="sha3_384";
break;
case NID_sha3_512:
name ="sha3_512";
break;
case NID_shake128:
name ="shake_128";
break;
case NID_shake256:
name ="shake_256";
break;
#endif
#ifdef PY_OPENSSL_HAS_BLAKE2
case NID_blake2s256:
name ="blake2s";
break;
case NID_blake2b512:
name ="blake2b";
break;
#endif
default:
/* Ignore aliased names and only use long, lowercase name. The aliases
* pollute the list and OpenSSL appears to have its own definition of
* alias as the resulting list still contains duplicate and alternate
* names for several algorithms.
*/
name = OBJ_nid2ln(nid);
if (name == NULL)
name = OBJ_nid2sn(nid);
break;
}
return PyUnicode_FromString(name);
}
static const EVP_MD*
py_digest_by_name(const char *name)
{
const EVP_MD *digest = EVP_get_digestbyname(name);
/* OpenSSL uses dash instead of underscore in names of some algorithms
* like SHA3 and SHAKE. Detect different spellings. */
if (digest == NULL) {
#ifdef NID_sha512_224
if (!strcmp(name, "sha512_224") || !strcmp(name, "SHA512_224")) {
digest = EVP_sha512_224();
}
else if (!strcmp(name, "sha512_256") || !strcmp(name, "SHA512_256")) {
digest = EVP_sha512_256();
}
#endif
#ifdef PY_OPENSSL_HAS_SHA3
/* could be sha3_ or shake_, Python never defined upper case */
else if (!strcmp(name, "sha3_224")) {
digest = EVP_sha3_224();
}
else if (!strcmp(name, "sha3_256")) {
digest = EVP_sha3_256();
}
else if (!strcmp(name, "sha3_384")) {
digest = EVP_sha3_384();
}
else if (!strcmp(name, "sha3_512")) {
digest = EVP_sha3_512();
}
else if (!strcmp(name, "shake_128")) {
digest = EVP_shake128();
}
else if (!strcmp(name, "shake_256")) {
digest = EVP_shake256();
}
#endif
#ifdef PY_OPENSSL_HAS_BLAKE2
else if (!strcmp(name, "blake2s256")) {
digest = EVP_blake2s256();
}
else if (!strcmp(name, "blake2b512")) {
digest = EVP_blake2b512();
}
#endif
}
return digest;
}
static EVPobject *
newEVPobject(void)
{
@ -304,16 +441,7 @@ EVP_get_digest_size(EVPobject *self, void *closure)
static PyObject *
EVP_get_name(EVPobject *self, void *closure)
{
const char *name = EVP_MD_name(EVP_MD_CTX_md(self->ctx));
PyObject *name_obj, *name_lower;
name_obj = PyUnicode_FromString(name);
if (!name_obj) {
return NULL;
}
name_lower = PyObject_CallMethod(name_obj, "lower", NULL);
Py_DECREF(name_obj);
return name_lower;
return py_digest_name(EVP_MD_CTX_md(self->ctx));
}
static PyGetSetDef EVP_getseters[] = {
@ -337,7 +465,7 @@ static PyObject *
EVP_repr(EVPobject *self)
{
PyObject *name_obj, *repr;
name_obj = EVP_get_name(self, NULL);
name_obj = py_digest_name(EVP_MD_CTX_md(self->ctx));
if (!name_obj) {
return NULL;
}
@ -403,6 +531,7 @@ static PyTypeObject EVPtype = {
0, /* tp_dictoffset */
};
\
static PyObject *
EVPnew(const EVP_MD *digest,
const unsigned char *cp, Py_ssize_t len, int usedforsecurity)
@ -485,7 +614,7 @@ EVP_new_impl(PyObject *module, PyObject *name_obj, PyObject *data_obj,
if (data_obj)
GET_BUFFER_VIEW_OR_ERROUT(data_obj, &view);
digest = EVP_get_digestbyname(name);
digest = py_digest_by_name(name);
ret_obj = EVPnew(digest,
(unsigned char*)view.buf, view.len,
@ -922,21 +1051,17 @@ typedef struct _internal_name_mapper_state {
/* A callback function to pass to OpenSSL's OBJ_NAME_do_all(...) */
static void
_openssl_hash_name_mapper(const OBJ_NAME *openssl_obj_name, void *arg)
_openssl_hash_name_mapper(const EVP_MD *md, const char *from,
const char *to, void *arg)
{
_InternalNameMapperState *state = (_InternalNameMapperState *)arg;
PyObject *py_name;
assert(state != NULL);
if (openssl_obj_name == NULL)
return;
/* Ignore aliased names, they pollute the list and OpenSSL appears to
* have its own definition of alias as the resulting list still
* contains duplicate and alternate names for several algorithms. */
if (openssl_obj_name->alias)
if (md == NULL)
return;
py_name = PyUnicode_FromString(openssl_obj_name->name);
py_name = py_digest_name(md);
if (py_name == NULL) {
state->error = 1;
} else {
@ -958,7 +1083,7 @@ generate_hash_name_list(void)
return NULL;
state.error = 0;
OBJ_NAME_do_all(OBJ_NAME_TYPE_MD_METH, &_openssl_hash_name_mapper, &state);
EVP_MD_do_all(&_openssl_hash_name_mapper, &state);
if (state.error) {
Py_DECREF(state.set);