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python2/00146-hashlib-fips.patch

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diff -up Python-2.7.2/Lib/hashlib.py.hashlib-fips Python-2.7.2/Lib/hashlib.py
--- Python-2.7.2/Lib/hashlib.py.hashlib-fips 2011-06-11 11:46:24.000000000 -0400
+++ Python-2.7.2/Lib/hashlib.py 2011-09-14 00:21:26.194252001 -0400
@@ -6,9 +6,12 @@
__doc__ = """hashlib module - A common interface to many hash functions.
-new(name, string='') - returns a new hash object implementing the
- given hash function; initializing the hash
- using the given string data.
+new(name, string='', usedforsecurity=True)
+ - returns a new hash object implementing the given hash function;
+ initializing the hash using the given string data.
+
+ "usedforsecurity" is a non-standard extension for better supporting
+ FIPS-compliant environments (see below)
Named constructor functions are also available, these are much faster
than using new():
@@ -24,6 +27,20 @@ the zlib module.
Choose your hash function wisely. Some have known collision weaknesses.
sha384 and sha512 will be slow on 32 bit platforms.
+Our implementation of hashlib uses OpenSSL.
+
+OpenSSL has a "FIPS mode", which, if enabled, may restrict the available hashes
+to only those that are compliant with FIPS regulations. For example, it may
+deny the use of MD5, on the grounds that this is not secure for uses such as
+authentication, system integrity checking, or digital signatures.
+
+If you need to use such a hash for non-security purposes (such as indexing into
+a data structure for speed), you can override the keyword argument
+"usedforsecurity" from True to False to signify that your code is not relying
+on the hash for security purposes, and this will allow the hash to be usable
+even in FIPS mode. This is not a standard feature of Python 2.7's hashlib, and
+is included here to better support FIPS mode.
+
Hash objects have these methods:
- update(arg): Update the hash object with the string arg. Repeated calls
are equivalent to a single call with the concatenation of all
@@ -63,76 +80,41 @@ algorithms = __always_supported
'pbkdf2_hmac')
-def __get_builtin_constructor(name):
- try:
- if name in ('SHA1', 'sha1'):
- import _sha
- return _sha.new
- elif name in ('MD5', 'md5'):
- import _md5
- return _md5.new
- elif name in ('SHA256', 'sha256', 'SHA224', 'sha224'):
- import _sha256
- bs = name[3:]
- if bs == '256':
- return _sha256.sha256
- elif bs == '224':
- return _sha256.sha224
- elif name in ('SHA512', 'sha512', 'SHA384', 'sha384'):
- import _sha512
- bs = name[3:]
- if bs == '512':
- return _sha512.sha512
- elif bs == '384':
- return _sha512.sha384
- except ImportError:
- pass # no extension module, this hash is unsupported.
-
- raise ValueError('unsupported hash type ' + name)
-
-
def __get_openssl_constructor(name):
try:
f = getattr(_hashlib, 'openssl_' + name)
# Allow the C module to raise ValueError. The function will be
# defined but the hash not actually available thanks to OpenSSL.
- f()
+ #
+ # We pass "usedforsecurity=False" to disable FIPS-based restrictions:
+ # at this stage we're merely seeing if the function is callable,
+ # rather than using it for actual work.
+ f(usedforsecurity=False)
# Use the C function directly (very fast)
return f
except (AttributeError, ValueError):
- return __get_builtin_constructor(name)
+ raise
-
-def __py_new(name, string=''):
- """new(name, string='') - Return a new hashing object using the named algorithm;
- optionally initialized with a string.
- """
- return __get_builtin_constructor(name)(string)
-
-
-def __hash_new(name, string=''):
+def __hash_new(name, string='', usedforsecurity=True):
"""new(name, string='') - Return a new hashing object using the named algorithm;
optionally initialized with a string.
+ Override 'usedforsecurity' to False when using for non-security purposes in
+ a FIPS environment
"""
try:
- return _hashlib.new(name, string)
+ return _hashlib.new(name, string, usedforsecurity)
except ValueError:
- # If the _hashlib module (OpenSSL) doesn't support the named
- # hash, try using our builtin implementations.
- # This allows for SHA224/256 and SHA384/512 support even though
- # the OpenSSL library prior to 0.9.8 doesn't provide them.
- return __get_builtin_constructor(name)(string)
-
+ raise
try:
import _hashlib
new = __hash_new
__get_hash = __get_openssl_constructor
algorithms_available = algorithms_available.union(
_hashlib.openssl_md_meth_names)
except ImportError:
- new = __py_new
- __get_hash = __get_builtin_constructor
+ # We don't build the legacy modules
+ raise
for __func_name in __always_supported:
# try them all, some may not work due to the OpenSSL
@@ -143,4 +125,4 @@ for __func_name in __always_supported:
# Cleanup locals()
del __always_supported, __func_name, __get_hash
-del __py_new, __hash_new, __get_openssl_constructor
+del __hash_new, __get_openssl_constructor
diff -up Python-2.7.2/Lib/test/test_hashlib.py.hashlib-fips Python-2.7.2/Lib/test/test_hashlib.py
--- Python-2.7.2/Lib/test/test_hashlib.py.hashlib-fips 2011-06-11 11:46:25.000000000 -0400
+++ Python-2.7.2/Lib/test/test_hashlib.py 2011-09-14 01:08:55.525254195 -0400
@@ -32,6 +32,19 @@ def hexstr(s):
r = r + h[(i >> 4) & 0xF] + h[i & 0xF]
return r
+def openssl_enforces_fips():
+ # Use the "openssl" command (if present) to try to determine if the local
+ # OpenSSL is configured to enforce FIPS
+ from subprocess import Popen, PIPE
+ try:
+ p = Popen(['openssl', 'md5'],
+ stdin=PIPE, stdout=PIPE, stderr=PIPE)
+ except OSError:
+ # "openssl" command not found
+ return False
+ stdout, stderr = p.communicate(input=b'abc')
+ return b'unknown cipher' in stderr
+OPENSSL_ENFORCES_FIPS = openssl_enforces_fips()
class HashLibTestCase(unittest.TestCase):
supported_hash_names = ( 'md5', 'MD5', 'sha1', 'SHA1',
@@ -61,10 +74,10 @@ class HashLibTestCase(unittest.TestCase)
# of hashlib.new given the algorithm name.
for algorithm, constructors in self.constructors_to_test.items():
constructors.add(getattr(hashlib, algorithm))
- def _test_algorithm_via_hashlib_new(data=None, _alg=algorithm):
+ def _test_algorithm_via_hashlib_new(data=None, _alg=algorithm, usedforsecurity=True):
if data is None:
- return hashlib.new(_alg)
- return hashlib.new(_alg, data)
+ return hashlib.new(_alg, usedforsecurity=usedforsecurity)
+ return hashlib.new(_alg, data, usedforsecurity=usedforsecurity)
constructors.add(_test_algorithm_via_hashlib_new)
_hashlib = self._conditional_import_module('_hashlib')
@@ -78,28 +91,13 @@ class HashLibTestCase(unittest.TestCase)
if constructor:
constructors.add(constructor)
- _md5 = self._conditional_import_module('_md5')
- if _md5:
- self.constructors_to_test['md5'].add(_md5.new)
- _sha = self._conditional_import_module('_sha')
- if _sha:
- self.constructors_to_test['sha1'].add(_sha.new)
- _sha256 = self._conditional_import_module('_sha256')
- if _sha256:
- self.constructors_to_test['sha224'].add(_sha256.sha224)
- self.constructors_to_test['sha256'].add(_sha256.sha256)
- _sha512 = self._conditional_import_module('_sha512')
- if _sha512:
- self.constructors_to_test['sha384'].add(_sha512.sha384)
- self.constructors_to_test['sha512'].add(_sha512.sha512)
-
super(HashLibTestCase, self).__init__(*args, **kwargs)
def test_hash_array(self):
a = array.array("b", range(10))
constructors = self.constructors_to_test.itervalues()
for cons in itertools.chain.from_iterable(constructors):
- c = cons(a)
+ c = cons(a, usedforsecurity=False)
c.hexdigest()
def test_algorithms_attribute(self):
@@ -115,28 +113,9 @@ class HashLibTestCase(unittest.TestCase)
self.assertRaises(ValueError, hashlib.new, 'spam spam spam spam spam')
self.assertRaises(TypeError, hashlib.new, 1)
- def test_get_builtin_constructor(self):
- get_builtin_constructor = hashlib.__dict__[
- '__get_builtin_constructor']
- self.assertRaises(ValueError, get_builtin_constructor, 'test')
- try:
- import _md5
- except ImportError:
- pass
- # This forces an ImportError for "import _md5" statements
- sys.modules['_md5'] = None
- try:
- self.assertRaises(ValueError, get_builtin_constructor, 'md5')
- finally:
- if '_md5' in locals():
- sys.modules['_md5'] = _md5
- else:
- del sys.modules['_md5']
- self.assertRaises(TypeError, get_builtin_constructor, 3)
-
def test_hexdigest(self):
for name in self.supported_hash_names:
- h = hashlib.new(name)
+ h = hashlib.new(name, usedforsecurity=False)
self.assertTrue(hexstr(h.digest()) == h.hexdigest())
def test_large_update(self):
@@ -145,16 +125,16 @@ class HashLibTestCase(unittest.TestCase)
abcs = aas + bees + cees
for name in self.supported_hash_names:
- m1 = hashlib.new(name)
+ m1 = hashlib.new(name, usedforsecurity=False)
m1.update(aas)
m1.update(bees)
m1.update(cees)
- m2 = hashlib.new(name)
+ m2 = hashlib.new(name, usedforsecurity=False)
m2.update(abcs)
self.assertEqual(m1.digest(), m2.digest(), name+' update problem.')
- m3 = hashlib.new(name, abcs)
+ m3 = hashlib.new(name, abcs, usedforsecurity=False)
self.assertEqual(m1.digest(), m3.digest(), name+' new problem.')
def check(self, name, data, digest):
@@ -162,7 +142,7 @@ class HashLibTestCase(unittest.TestCase)
# 2 is for hashlib.name(...) and hashlib.new(name, ...)
self.assertGreaterEqual(len(constructors), 2)
for hash_object_constructor in constructors:
- computed = hash_object_constructor(data).hexdigest()
+ computed = hash_object_constructor(data, usedforsecurity=False).hexdigest()
self.assertEqual(
computed, digest,
"Hash algorithm %s constructed using %s returned hexdigest"
@@ -172,7 +152,8 @@ class HashLibTestCase(unittest.TestCase)
def check_unicode(self, algorithm_name):
# Unicode objects are not allowed as input.
- expected = hashlib.new(algorithm_name, str(u'spam')).hexdigest()
+ expected = hashlib.new(algorithm_name, str(u'spam'),
+ usedforsecurity=False).hexdigest()
self.check(algorithm_name, u'spam', expected)
def test_unicode(self):
@@ -354,6 +335,70 @@ class HashLibTestCase(unittest.TestCase)
self.assertEqual(expected_hash, hasher.hexdigest())
+ def test_issue9146(self):
+ # Ensure that various ways to use "MD5" from "hashlib" don't segfault:
+ m = hashlib.md5(usedforsecurity=False)
+ m.update(b'abc\n')
+ self.assertEquals(m.hexdigest(), "0bee89b07a248e27c83fc3d5951213c1")
+
+ m = hashlib.new('md5', usedforsecurity=False)
+ m.update(b'abc\n')
+ self.assertEquals(m.hexdigest(), "0bee89b07a248e27c83fc3d5951213c1")
+
+ m = hashlib.md5(b'abc\n', usedforsecurity=False)
+ self.assertEquals(m.hexdigest(), "0bee89b07a248e27c83fc3d5951213c1")
+
+ m = hashlib.new('md5', b'abc\n', usedforsecurity=False)
+ self.assertEquals(m.hexdigest(), "0bee89b07a248e27c83fc3d5951213c1")
+
+ def assertRaisesUnknownCipher(self, callable_obj=None, *args, **kwargs):
+ try:
+ callable_obj(*args, **kwargs)
+ except ValueError, e:
+ if not e.args[0].endswith('unknown cipher'):
+ self.fail('Incorrect exception raised')
+ else:
+ self.fail('Exception was not raised')
+
+ @unittest.skipUnless(OPENSSL_ENFORCES_FIPS,
+ 'FIPS enforcement required for this test.')
+ def test_hashlib_fips_mode(self):
+ # Ensure that we raise a ValueError on vanilla attempts to use MD5
+ # in hashlib in a FIPS-enforced setting:
+ self.assertRaisesUnknownCipher(hashlib.md5)
+ self.assertRaisesUnknownCipher(hashlib.new, 'md5')
+
+ @unittest.skipUnless(OPENSSL_ENFORCES_FIPS,
+ 'FIPS enforcement required for this test.')
+ def test_hashopenssl_fips_mode(self):
+ # Verify the _hashlib module's handling of md5:
+ import _hashlib
+
+ assert hasattr(_hashlib, 'openssl_md5')
+
+ # Ensure that _hashlib raises a ValueError on vanilla attempts to
+ # use MD5 in a FIPS-enforced setting:
+ self.assertRaisesUnknownCipher(_hashlib.openssl_md5)
+ self.assertRaisesUnknownCipher(_hashlib.new, 'md5')
+
+ # Ensure that in such a setting we can whitelist a callsite with
+ # usedforsecurity=False and have it succeed:
+ m = _hashlib.openssl_md5(usedforsecurity=False)
+ m.update('abc\n')
+ self.assertEquals(m.hexdigest(), "0bee89b07a248e27c83fc3d5951213c1")
+
+ m = _hashlib.new('md5', usedforsecurity=False)
+ m.update('abc\n')
+ self.assertEquals(m.hexdigest(), "0bee89b07a248e27c83fc3d5951213c1")
+
+ m = _hashlib.openssl_md5('abc\n', usedforsecurity=False)
+ self.assertEquals(m.hexdigest(), "0bee89b07a248e27c83fc3d5951213c1")
+
+ m = _hashlib.new('md5', 'abc\n', usedforsecurity=False)
+ self.assertEquals(m.hexdigest(), "0bee89b07a248e27c83fc3d5951213c1")
+
+
+
class KDFTests(unittest.TestCase):
pbkdf2_test_vectors = [
(b'password', b'salt', 1, None),
diff -up Python-2.7.2/Modules/Setup.dist.hashlib-fips Python-2.7.2/Modules/Setup.dist
--- Python-2.7.2/Modules/Setup.dist.hashlib-fips 2011-09-14 00:21:26.163252001 -0400
+++ Python-2.7.2/Modules/Setup.dist 2011-09-14 00:21:26.201252001 -0400
@@ -248,14 +248,14 @@ imageop imageop.c # Operations on images
# Message-Digest Algorithm, described in RFC 1321. The necessary files
# md5.c and md5.h are included here.
-_md5 md5module.c md5.c
+#_md5 md5module.c md5.c
# The _sha module implements the SHA checksum algorithms.
# (NIST's Secure Hash Algorithms.)
-_sha shamodule.c
-_sha256 sha256module.c
-_sha512 sha512module.c
+#_sha shamodule.c
+#_sha256 sha256module.c
+#_sha512 sha512module.c
# SGI IRIX specific modules -- off by default.
diff -up Python-2.7.2/setup.py.hashlib-fips Python-2.7.2/setup.py
--- Python-2.7.2/setup.py.hashlib-fips 2011-09-14 00:21:25.722252001 -0400
+++ Python-2.7.2/setup.py 2011-09-14 00:21:26.203252001 -0400
@@ -768,21 +768,6 @@ class PyBuildExt(build_ext):
print ("warning: openssl 0x%08x is too old for _hashlib" %
openssl_ver)
missing.append('_hashlib')
- if COMPILED_WITH_PYDEBUG or not have_usable_openssl:
- # The _sha module implements the SHA1 hash algorithm.
- exts.append( Extension('_sha', ['shamodule.c']) )
- # The _md5 module implements the RSA Data Security, Inc. MD5
- # Message-Digest Algorithm, described in RFC 1321. The
- # necessary files md5.c and md5.h are included here.
- exts.append( Extension('_md5',
- sources = ['md5module.c', 'md5.c'],
- depends = ['md5.h']) )
-
- min_sha2_openssl_ver = 0x00908000
- if COMPILED_WITH_PYDEBUG or openssl_ver < min_sha2_openssl_ver:
- # OpenSSL doesn't do these until 0.9.8 so we'll bring our own hash
- exts.append( Extension('_sha256', ['sha256module.c']) )
- exts.append( Extension('_sha512', ['sha512module.c']) )
# Modules that provide persistent dictionary-like semantics. You will
# probably want to arrange for at least one of them to be available on
--- Python-2.7.8/Modules/_hashopenssl.c.orig 2014-06-30 04:05:41.000000000 +0200
+++ Python-2.7.8/Modules/_hashopenssl.c 2014-07-14 14:21:59.546386572 +0200
@@ -36,6 +36,8 @@
#endif
/* EVP is the preferred interface to hashing in OpenSSL */
+#include <openssl/ssl.h>
+#include <openssl/err.h>
#include <openssl/evp.h>
#include <openssl/hmac.h>
#include <openssl/err.h>
@@ -67,11 +69,19 @@
static PyTypeObject EVPtype;
+/* Struct to hold all the cached information we need on a specific algorithm.
+ We have one of these per algorithm */
+typedef struct {
+ PyObject *name_obj;
+ EVP_MD_CTX ctxs[2];
+ /* ctx_ptrs will point to ctxs unless an error occurred, when it will
+ be NULL: */
+ EVP_MD_CTX *ctx_ptrs[2];
+ PyObject *error_msgs[2];
+} EVPCachedInfo;
-#define DEFINE_CONSTS_FOR_NEW(Name) \
- static PyObject *CONST_ ## Name ## _name_obj = NULL; \
- static EVP_MD_CTX CONST_new_ ## Name ## _ctx; \
- static EVP_MD_CTX *CONST_new_ ## Name ## _ctx_p = NULL;
+#define DEFINE_CONSTS_FOR_NEW(Name) \
+ static EVPCachedInfo cached_info_ ##Name;
DEFINE_CONSTS_FOR_NEW(md5)
DEFINE_CONSTS_FOR_NEW(sha1)
@@ -117,6 +127,48 @@
}
}
+static void
+mc_ctx_init(EVP_MD_CTX *ctx, int usedforsecurity)
+{
+ EVP_MD_CTX_init(ctx);
+
+ /*
+ If the user has declared that this digest is being used in a
+ non-security role (e.g. indexing into a data structure), set
+ the exception flag for openssl to allow it
+ */
+ if (!usedforsecurity) {
+#ifdef EVP_MD_CTX_FLAG_NON_FIPS_ALLOW
+ EVP_MD_CTX_set_flags(ctx,
+ EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
+#endif
+ }
+}
+
+/* Get an error msg for the last error as a PyObject */
+static PyObject *
+error_msg_for_last_error(void)
+{
+ char *errstr;
+
+ errstr = ERR_error_string(ERR_peek_last_error(), NULL);
+ ERR_clear_error();
+
+ return PyString_FromString(errstr); /* Can be NULL */
+}
+
+static void
+set_evp_exception(void)
+{
+ char *errstr;
+
+ errstr = ERR_error_string(ERR_peek_last_error(), NULL);
+ ERR_clear_error();
+
+ PyErr_SetString(PyExc_ValueError, errstr);
+}
+
+
/* Internal methods for a hash object */
static void
@@ -315,14 +367,15 @@
static int
EVP_tp_init(EVPobject *self, PyObject *args, PyObject *kwds)
{
- static char *kwlist[] = {"name", "string", NULL};
+ static char *kwlist[] = {"name", "string", "usedforsecurity", NULL};
PyObject *name_obj = NULL;
+ int usedforsecurity = 1;
Py_buffer view = { 0 };
char *nameStr;
const EVP_MD *digest;
- if (!PyArg_ParseTupleAndKeywords(args, kwds, "O|s*:HASH", kwlist,
- &name_obj, &view)) {
+ if (!PyArg_ParseTupleAndKeywords(args, kwds, "O|s*i:HASH", kwlist,
+ &name_obj, &view, &usedforsecurity)) {
return -1;
}
@@ -338,7 +391,12 @@
PyBuffer_Release(&view);
return -1;
}
- EVP_DigestInit(&self->ctx, digest);
+ mc_ctx_init(&self->ctx, usedforsecurity);
+ if (!EVP_DigestInit_ex(&self->ctx, digest, NULL)) {
+ set_evp_exception();
+ PyBuffer_Release(&view);
+ return -1;
+ }
self->name = name_obj;
Py_INCREF(self->name);
@@ -422,7 +480,8 @@
static PyObject *
EVPnew(PyObject *name_obj,
const EVP_MD *digest, const EVP_MD_CTX *initial_ctx,
- const unsigned char *cp, Py_ssize_t len)
+ const unsigned char *cp, Py_ssize_t len,
+ int usedforsecurity)
{
EVPobject *self;
@@ -437,7 +496,12 @@
if (initial_ctx) {
EVP_MD_CTX_copy(&self->ctx, initial_ctx);
} else {
- EVP_DigestInit(&self->ctx, digest);
+ mc_ctx_init(&self->ctx, usedforsecurity);
+ if (!EVP_DigestInit_ex(&self->ctx, digest, NULL)) {
+ set_evp_exception();
+ Py_DECREF(self);
+ return NULL;
+ }
}
if (cp && len) {
@@ -461,20 +525,28 @@
An optional string argument may be provided and will be\n\
automatically hashed.\n\
\n\
-The MD5 and SHA1 algorithms are always supported.\n");
+The MD5 and SHA1 algorithms are always supported.\n\
+\n\
+An optional \"usedforsecurity=True\" keyword argument is provided for use in\n\
+environments that enforce FIPS-based restrictions. Some implementations of\n\
+OpenSSL can be configured to prevent the usage of non-secure algorithms (such\n\
+as MD5). If you have a non-security use for these algorithms (e.g. a hash\n\
+table), you can override this argument by marking the callsite as\n\
+\"usedforsecurity=False\".");
static PyObject *
EVP_new(PyObject *self, PyObject *args, PyObject *kwdict)
{
- static char *kwlist[] = {"name", "string", NULL};
+ static char *kwlist[] = {"name", "string", "usedforsecurity", NULL};
PyObject *name_obj = NULL;
Py_buffer view = { 0 };
PyObject *ret_obj;
char *name;
const EVP_MD *digest;
+ int usedforsecurity = 1;
- if (!PyArg_ParseTupleAndKeywords(args, kwdict, "O|s*:new", kwlist,
- &name_obj, &view)) {
+ if (!PyArg_ParseTupleAndKeywords(args, kwdict, "O|s*i:new", kwlist,
+ &name_obj, &view, &usedforsecurity)) {
return NULL;
}
@@ -487,7 +559,7 @@
digest = EVP_get_digestbyname(name);
ret_obj = EVPnew(name_obj, digest, NULL, (unsigned char*)view.buf,
- view.len);
+ view.len, usedforsecurity);
PyBuffer_Release(&view);
return ret_obj;
@@ -713,51 +785,111 @@
/*
- * This macro generates constructor function definitions for specific
- * hash algorithms. These constructors are much faster than calling
- * the generic one passing it a python string and are noticably
- * faster than calling a python new() wrapper. Thats important for
+ * This macro and function generates a family of constructor function
+ * definitions for specific hash algorithms. These constructors are much
+ * faster than calling the generic one passing it a python string and are
+ * noticably faster than calling a python new() wrapper. That's important for
* code that wants to make hashes of a bunch of small strings.
*/
#define GEN_CONSTRUCTOR(NAME) \
static PyObject * \
- EVP_new_ ## NAME (PyObject *self, PyObject *args) \
+ EVP_new_ ## NAME (PyObject *self, PyObject *args, PyObject *kwdict) \
{ \
- Py_buffer view = { 0 }; \
- PyObject *ret_obj; \
- \
- if (!PyArg_ParseTuple(args, "|s*:" #NAME , &view)) { \
- return NULL; \
- } \
- \
- ret_obj = EVPnew( \
- CONST_ ## NAME ## _name_obj, \
- NULL, \
- CONST_new_ ## NAME ## _ctx_p, \
- (unsigned char*)view.buf, view.len); \
- PyBuffer_Release(&view); \
- return ret_obj; \
+ return implement_specific_EVP_new(self, args, kwdict, \
+ "|s*i:" #NAME, \
+ &cached_info_ ## NAME ); \
}
+static PyObject *
+implement_specific_EVP_new(PyObject *self, PyObject *args, PyObject *kwdict,
+ const char *format,
+ EVPCachedInfo *cached_info)
+{
+ static char *kwlist[] = {"string", "usedforsecurity", NULL};
+ Py_buffer view = { 0 };
+ int usedforsecurity = 1;
+ int idx;
+ PyObject *ret_obj = NULL;
+
+ assert(cached_info);
+
+ if (!PyArg_ParseTupleAndKeywords(args, kwdict, format, kwlist,
+ &view, &usedforsecurity)) {
+ return NULL;
+ }
+
+ idx = usedforsecurity ? 1 : 0;
+
+ /*
+ * If an error occurred during creation of the global content, the ctx_ptr
+ * will be NULL, and the error_msg will hopefully be non-NULL:
+ */
+ if (cached_info->ctx_ptrs[idx]) {
+ /* We successfully initialized this context; copy it: */
+ ret_obj = EVPnew(cached_info->name_obj,
+ NULL,
+ cached_info->ctx_ptrs[idx],
+ (unsigned char*)view.buf, view.len,
+ usedforsecurity);
+ } else {
+ /* Some kind of error happened initializing the global context for
+ this (digest, usedforsecurity) pair.
+ Raise an exception with the saved error message: */
+ if (cached_info->error_msgs[idx]) {
+ PyErr_SetObject(PyExc_ValueError, cached_info->error_msgs[idx]);
+ } else {
+ PyErr_SetString(PyExc_ValueError, "Error initializing hash");
+ }
+ }
+
+ PyBuffer_Release(&view);
+
+ return ret_obj;
+}
+
/* a PyMethodDef structure for the constructor */
#define CONSTRUCTOR_METH_DEF(NAME) \
- {"openssl_" #NAME, (PyCFunction)EVP_new_ ## NAME, METH_VARARGS, \
+ {"openssl_" #NAME, (PyCFunction)EVP_new_ ## NAME, \
+ METH_VARARGS |METH_KEYWORDS, \
PyDoc_STR("Returns a " #NAME \
" hash object; optionally initialized with a string") \
}
-/* used in the init function to setup a constructor: initialize OpenSSL
- constructor constants if they haven't been initialized already. */
-#define INIT_CONSTRUCTOR_CONSTANTS(NAME) do { \
- if (CONST_ ## NAME ## _name_obj == NULL) { \
- CONST_ ## NAME ## _name_obj = PyString_FromString(#NAME); \
- if (EVP_get_digestbyname(#NAME)) { \
- CONST_new_ ## NAME ## _ctx_p = &CONST_new_ ## NAME ## _ctx; \
- EVP_DigestInit(CONST_new_ ## NAME ## _ctx_p, EVP_get_digestbyname(#NAME)); \
- } \
- } \
+/*
+ Macro/function pair to set up the constructors.
+
+ Try to initialize a context for each hash twice, once with
+ EVP_MD_CTX_FLAG_NON_FIPS_ALLOW and once without.
+
+ Any that have errors during initialization will end up wit a NULL ctx_ptrs
+ entry, and err_msgs will be set (unless we're very low on memory)
+*/
+#define INIT_CONSTRUCTOR_CONSTANTS(NAME) do { \
+ init_constructor_constant(&cached_info_ ## NAME, #NAME); \
} while (0);
+static void
+init_constructor_constant(EVPCachedInfo *cached_info, const char *name)
+{
+ assert(cached_info);
+ cached_info->name_obj = PyString_FromString(name);
+ if (EVP_get_digestbyname(name)) {
+ int i;
+ for (i=0; i<2; i++) {
+ mc_ctx_init(&cached_info->ctxs[i], i);
+ if (EVP_DigestInit_ex(&cached_info->ctxs[i],
+ EVP_get_digestbyname(name), NULL)) {
+ /* Success: */
+ cached_info->ctx_ptrs[i] = &cached_info->ctxs[i];
+ } else {
+ /* Failure: */
+ cached_info->ctx_ptrs[i] = NULL;
+ cached_info->error_msgs[i] = error_msg_for_last_error();
+ }
+ }
+ }
+}
+
GEN_CONSTRUCTOR(md5)
GEN_CONSTRUCTOR(sha1)
#ifdef _OPENSSL_SUPPORTS_SHA2
@@ -794,14 +926,11 @@
{
PyObject *m, *openssl_md_meth_names;
+ SSL_load_error_strings();
+ SSL_library_init();
OpenSSL_add_all_digests();
ERR_load_crypto_strings();
- /* TODO build EVP_functions openssl_* entries dynamically based
- * on what hashes are supported rather than listing many
- * but having some be unsupported. Only init appropriate
- * constants. */
-
Py_TYPE(&EVPtype) = &PyType_Type;
if (PyType_Ready(&EVPtype) < 0)
return;
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