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/**
* Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
* SPDX-License-Identifier: Apache-2.0.
*/
#include "crypto.h"
#include "aws/cal/hash.h"
#include "aws/cal/hmac.h"
const char *s_capsule_name_hash = "aws_hash";
const char *s_capsule_name_hmac = "aws_hmac";
static void s_hash_destructor(PyObject *hash_capsule) {
assert(PyCapsule_CheckExact(hash_capsule));
struct aws_hash *hash = PyCapsule_GetPointer(hash_capsule, s_capsule_name_hash);
assert(hash);
aws_hash_destroy(hash);
}
static void s_hmac_destructor(PyObject *hmac_capsule) {
assert(PyCapsule_CheckExact(hmac_capsule));
struct aws_hmac *hmac = PyCapsule_GetPointer(hmac_capsule, s_capsule_name_hmac);
assert(hmac);
aws_hmac_destroy(hmac);
}
PyObject *aws_py_sha1_new(PyObject *self, PyObject *args) {
(void)self;
(void)args;
struct aws_allocator *allocator = aws_py_get_allocator();
struct aws_hash *sha1 = aws_sha1_new(allocator);
if (!sha1) {
return PyErr_AwsLastError();
}
PyObject *capsule = PyCapsule_New(sha1, s_capsule_name_hash, s_hash_destructor);
if (capsule == NULL) {
aws_hash_destroy(sha1);
return NULL;
}
return capsule;
}
PyObject *aws_py_sha256_new(PyObject *self, PyObject *args) {
(void)self;
(void)args;
struct aws_allocator *allocator = aws_py_get_allocator();
struct aws_hash *sha256 = aws_sha256_new(allocator);
if (!sha256) {
return PyErr_AwsLastError();
}
PyObject *capsule = PyCapsule_New(sha256, s_capsule_name_hash, s_hash_destructor);
if (capsule == NULL) {
aws_hash_destroy(sha256);
return NULL;
}
return capsule;
}
PyObject *aws_py_md5_new(PyObject *self, PyObject *args) {
(void)self;
(void)args;
struct aws_allocator *allocator = aws_py_get_allocator();
struct aws_hash *md5 = aws_md5_new(allocator);
if (!md5) {
return PyErr_AwsLastError();
}
PyObject *capsule = PyCapsule_New(md5, s_capsule_name_hash, s_hash_destructor);
if (capsule == NULL) {
aws_hash_destroy(md5);
return NULL;
}
return capsule;
}
PyObject *aws_py_hash_update(PyObject *self, PyObject *args) {
(void)self;
PyObject *hash_capsule = NULL;
const char *to_hash_c_str;
Py_ssize_t to_hash_len;
if (!PyArg_ParseTuple(args, "Os#", &hash_capsule, &to_hash_c_str, &to_hash_len)) {
return PyErr_AwsLastError();
}
struct aws_hash *hash = PyCapsule_GetPointer(hash_capsule, s_capsule_name_hash);
if (!hash) {
return PyErr_AwsLastError();
}
struct aws_byte_cursor to_hash_cursor;
to_hash_cursor = aws_byte_cursor_from_array(to_hash_c_str, to_hash_len);
/* Releasing the GIL for very small buffers is inefficient
and may lower performance */
if (to_hash_len > 1024 * 5) {
int aws_op = AWS_OP_SUCCESS;
/* clang-format off */
Py_BEGIN_ALLOW_THREADS
aws_op = aws_hash_update(hash, &to_hash_cursor);
Py_END_ALLOW_THREADS
if (aws_op != AWS_OP_SUCCESS) {
return PyErr_AwsLastError();
}
/* clang-format on */
} else {
if (aws_hash_update(hash, &to_hash_cursor)) {
return PyErr_AwsLastError();
}
}
Py_RETURN_NONE;
}
PyObject *aws_py_hash_digest(PyObject *self, PyObject *args) {
(void)self;
PyObject *hash_capsule = NULL;
Py_ssize_t truncate_to;
if (!PyArg_ParseTuple(args, "On", &hash_capsule, &truncate_to)) {
return PyErr_AwsLastError();
}
struct aws_hash *hash = PyCapsule_GetPointer(hash_capsule, s_capsule_name_hash);
if (!hash) {
return PyErr_AwsLastError();
}
uint8_t output[128] = {0};
struct aws_byte_buf digest_buf = aws_byte_buf_from_array(output, hash->digest_size);
digest_buf.len = 0;
if (aws_hash_finalize(hash, &digest_buf, truncate_to)) {
return PyErr_AwsLastError();
}
return PyBytes_FromStringAndSize((const char *)output, digest_buf.len);
}
PyObject *aws_py_sha256_hmac_new(PyObject *self, PyObject *args) {
(void)self;
struct aws_allocator *allocator = aws_py_get_allocator();
const char *secret_ptr;
Py_ssize_t secret_len;
if (!PyArg_ParseTuple(args, "s#", &secret_ptr, &secret_len)) {
return PyErr_AwsLastError();
}
struct aws_byte_cursor secret_cursor;
secret_cursor = aws_byte_cursor_from_array(secret_ptr, secret_len);
struct aws_hmac *sha256_hmac = aws_sha256_hmac_new(allocator, &secret_cursor);
if (!sha256_hmac) {
return PyErr_AwsLastError();
}
return PyCapsule_New(sha256_hmac, s_capsule_name_hmac, s_hmac_destructor);
}
PyObject *aws_py_hmac_update(PyObject *self, PyObject *args) {
(void)self;
PyObject *hmac_capsule = NULL;
const char *to_hmac_ptr;
Py_ssize_t to_hmac_len;
if (!PyArg_ParseTuple(args, "Os#", &hmac_capsule, &to_hmac_ptr, &to_hmac_len)) {
return PyErr_AwsLastError();
}
struct aws_hmac *hmac = PyCapsule_GetPointer(hmac_capsule, s_capsule_name_hmac);
if (!hmac) {
return PyErr_AwsLastError();
}
struct aws_byte_cursor to_hmac_cursor;
to_hmac_cursor = aws_byte_cursor_from_array(to_hmac_ptr, to_hmac_len);
if (aws_hmac_update(hmac, &to_hmac_cursor)) {
return PyErr_AwsLastError();
}
Py_RETURN_NONE;
}
PyObject *aws_py_hmac_digest(PyObject *self, PyObject *args) {
(void)self;
PyObject *hmac_capsule = NULL;
Py_ssize_t truncate_to;
if (!PyArg_ParseTuple(args, "On", &hmac_capsule, &truncate_to)) {
return PyErr_AwsLastError();
}
struct aws_hmac *hmac = PyCapsule_GetPointer(hmac_capsule, s_capsule_name_hmac);
if (!hmac) {
return PyErr_AwsLastError();
}
uint8_t output[128] = {0};
struct aws_byte_buf digest_buf = aws_byte_buf_from_array(output, hmac->digest_size);
digest_buf.len = 0;
if (aws_hmac_finalize(hmac, &digest_buf, truncate_to)) {
return PyErr_AwsLastError();
}
return PyBytes_FromStringAndSize((const char *)output, digest_buf.len);
}
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