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-rw-r--r--core/crypto/aes_context.cpp116
-rw-r--r--core/crypto/aes_context.h68
-rw-r--r--core/crypto/crypto_core.cpp10
-rw-r--r--core/crypto/crypto_core.h2
4 files changed, 196 insertions, 0 deletions
diff --git a/core/crypto/aes_context.cpp b/core/crypto/aes_context.cpp
new file mode 100644
index 0000000000..8ef1f4f1d4
--- /dev/null
+++ b/core/crypto/aes_context.cpp
@@ -0,0 +1,116 @@
+/*************************************************************************/
+/* aes_context.cpp */
+/*************************************************************************/
+/* This file is part of: */
+/* GODOT ENGINE */
+/* https://godotengine.org */
+/*************************************************************************/
+/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur. */
+/* Copyright (c) 2014-2020 Godot Engine contributors (cf. AUTHORS.md). */
+/* */
+/* Permission is hereby granted, free of charge, to any person obtaining */
+/* a copy of this software and associated documentation files (the */
+/* "Software"), to deal in the Software without restriction, including */
+/* without limitation the rights to use, copy, modify, merge, publish, */
+/* distribute, sublicense, and/or sell copies of the Software, and to */
+/* permit persons to whom the Software is furnished to do so, subject to */
+/* the following conditions: */
+/* */
+/* The above copyright notice and this permission notice shall be */
+/* included in all copies or substantial portions of the Software. */
+/* */
+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
+/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
+/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
+/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
+/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
+/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
+/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
+/*************************************************************************/
+
+#include "core/crypto/aes_context.h"
+
+Error AESContext::start(Mode p_mode, PackedByteArray p_key, PackedByteArray p_iv) {
+ ERR_FAIL_COND_V_MSG(mode != MODE_MAX, ERR_ALREADY_IN_USE, "AESContext already started. Call 'finish' before starting a new one.");
+ ERR_FAIL_COND_V_MSG(p_mode < 0 || p_mode >= MODE_MAX, ERR_INVALID_PARAMETER, "Invalid mode requested.");
+ // Key check.
+ int key_bits = p_key.size() << 3;
+ ERR_FAIL_COND_V_MSG(key_bits != 128 && key_bits != 256, ERR_INVALID_PARAMETER, "AES key must be either 16 or 32 bytes");
+ // Initialization vector.
+ if (p_mode == MODE_CBC_ENCRYPT || p_mode == MODE_CBC_DECRYPT) {
+ ERR_FAIL_COND_V_MSG(p_iv.size() != 16, ERR_INVALID_PARAMETER, "The initialization vector (IV) must be exactly 16 bytes.");
+ iv.resize(0);
+ iv.append_array(p_iv);
+ }
+ // Encryption/decryption key.
+ if (p_mode == MODE_CBC_ENCRYPT || p_mode == MODE_ECB_ENCRYPT) {
+ ctx.set_encode_key(p_key.ptr(), key_bits);
+ } else {
+ ctx.set_decode_key(p_key.ptr(), key_bits);
+ }
+ mode = p_mode;
+ return OK;
+}
+
+PackedByteArray AESContext::update(PackedByteArray p_src) {
+ ERR_FAIL_COND_V_MSG(mode < 0 || mode >= MODE_MAX, PackedByteArray(), "AESContext not started. Call 'start' before calling 'update'.");
+ int len = p_src.size();
+ ERR_FAIL_COND_V_MSG(len % 16, PackedByteArray(), "The number of bytes to be encrypted must be multiple of 16. Add padding if needed");
+ PackedByteArray out;
+ out.resize(len);
+ const uint8_t *src_ptr = p_src.ptr();
+ uint8_t *out_ptr = out.ptrw();
+ switch (mode) {
+ case MODE_ECB_ENCRYPT: {
+ for (int i = 0; i < len; i += 16) {
+ Error err = ctx.encrypt_ecb(src_ptr + i, out_ptr + i);
+ ERR_FAIL_COND_V(err != OK, PackedByteArray());
+ }
+ } break;
+ case MODE_ECB_DECRYPT: {
+ for (int i = 0; i < len; i += 16) {
+ Error err = ctx.decrypt_ecb(src_ptr + i, out_ptr + i);
+ ERR_FAIL_COND_V(err != OK, PackedByteArray());
+ }
+ } break;
+ case MODE_CBC_ENCRYPT: {
+ Error err = ctx.encrypt_cbc(len, iv.ptrw(), p_src.ptr(), out.ptrw());
+ ERR_FAIL_COND_V(err != OK, PackedByteArray());
+ } break;
+ case MODE_CBC_DECRYPT: {
+ Error err = ctx.decrypt_cbc(len, iv.ptrw(), p_src.ptr(), out.ptrw());
+ ERR_FAIL_COND_V(err != OK, PackedByteArray());
+ } break;
+ default:
+ ERR_FAIL_V_MSG(PackedByteArray(), "Bug!");
+ }
+ return out;
+}
+
+PackedByteArray AESContext::get_iv_state() {
+ ERR_FAIL_COND_V_MSG(mode != MODE_CBC_ENCRYPT && mode != MODE_CBC_DECRYPT, PackedByteArray(), "Calling 'get_iv_state' only makes sense when the context is started in CBC mode.");
+ PackedByteArray out;
+ out.append_array(iv);
+ return out;
+}
+
+void AESContext::finish() {
+ mode = MODE_MAX;
+ iv.resize(0);
+}
+
+void AESContext::_bind_methods() {
+ ClassDB::bind_method(D_METHOD("start", "mode", "key", "iv"), &AESContext::start, DEFVAL(PackedByteArray()));
+ ClassDB::bind_method(D_METHOD("update", "src"), &AESContext::update);
+ ClassDB::bind_method(D_METHOD("get_iv_state"), &AESContext::get_iv_state);
+ ClassDB::bind_method(D_METHOD("finish"), &AESContext::finish);
+ BIND_ENUM_CONSTANT(MODE_ECB_ENCRYPT);
+ BIND_ENUM_CONSTANT(MODE_ECB_DECRYPT);
+ BIND_ENUM_CONSTANT(MODE_CBC_ENCRYPT);
+ BIND_ENUM_CONSTANT(MODE_CBC_DECRYPT);
+ BIND_ENUM_CONSTANT(MODE_MAX);
+}
+
+AESContext::AESContext() {
+ mode = MODE_MAX;
+}
diff --git a/core/crypto/aes_context.h b/core/crypto/aes_context.h
new file mode 100644
index 0000000000..006ecee2ad
--- /dev/null
+++ b/core/crypto/aes_context.h
@@ -0,0 +1,68 @@
+/*************************************************************************/
+/* aes_context.h */
+/*************************************************************************/
+/* This file is part of: */
+/* GODOT ENGINE */
+/* https://godotengine.org */
+/*************************************************************************/
+/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur. */
+/* Copyright (c) 2014-2020 Godot Engine contributors (cf. AUTHORS.md). */
+/* */
+/* Permission is hereby granted, free of charge, to any person obtaining */
+/* a copy of this software and associated documentation files (the */
+/* "Software"), to deal in the Software without restriction, including */
+/* without limitation the rights to use, copy, modify, merge, publish, */
+/* distribute, sublicense, and/or sell copies of the Software, and to */
+/* permit persons to whom the Software is furnished to do so, subject to */
+/* the following conditions: */
+/* */
+/* The above copyright notice and this permission notice shall be */
+/* included in all copies or substantial portions of the Software. */
+/* */
+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
+/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
+/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
+/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
+/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
+/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
+/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
+/*************************************************************************/
+
+#ifndef AES_CONTEXT_H
+#define AES_CONTEXT_H
+
+#include "core/crypto/crypto_core.h"
+#include "core/reference.h"
+
+class AESContext : public Reference {
+ GDCLASS(AESContext, Reference);
+
+public:
+ enum Mode {
+ MODE_ECB_ENCRYPT,
+ MODE_ECB_DECRYPT,
+ MODE_CBC_ENCRYPT,
+ MODE_CBC_DECRYPT,
+ MODE_MAX
+ };
+
+private:
+ Mode mode;
+ CryptoCore::AESContext ctx;
+ PackedByteArray iv;
+
+protected:
+ static void _bind_methods();
+
+public:
+ Error start(Mode p_mode, PackedByteArray p_key, PackedByteArray p_iv = PackedByteArray());
+ PackedByteArray update(PackedByteArray p_src);
+ PackedByteArray get_iv_state();
+ void finish();
+
+ AESContext();
+};
+
+VARIANT_ENUM_CAST(AESContext::Mode);
+
+#endif // AES_CONTEXT_H
diff --git a/core/crypto/crypto_core.cpp b/core/crypto/crypto_core.cpp
index ec25ee0d38..b0dc47e655 100644
--- a/core/crypto/crypto_core.cpp
+++ b/core/crypto/crypto_core.cpp
@@ -145,6 +145,16 @@ Error CryptoCore::AESContext::decrypt_ecb(const uint8_t p_src[16], uint8_t r_dst
return ret ? FAILED : OK;
}
+Error CryptoCore::AESContext::encrypt_cbc(size_t p_length, uint8_t r_iv[16], const uint8_t *p_src, uint8_t *r_dst) {
+ int ret = mbedtls_aes_crypt_cbc((mbedtls_aes_context *)ctx, MBEDTLS_AES_ENCRYPT, p_length, r_iv, p_src, r_dst);
+ return ret ? FAILED : OK;
+}
+
+Error CryptoCore::AESContext::decrypt_cbc(size_t p_length, uint8_t r_iv[16], const uint8_t *p_src, uint8_t *r_dst) {
+ int ret = mbedtls_aes_crypt_cbc((mbedtls_aes_context *)ctx, MBEDTLS_AES_DECRYPT, p_length, r_iv, p_src, r_dst);
+ return ret ? FAILED : OK;
+}
+
// CryptoCore
String CryptoCore::b64_encode_str(const uint8_t *p_src, int p_src_len) {
int b64len = p_src_len / 3 * 4 + 4 + 1;
diff --git a/core/crypto/crypto_core.h b/core/crypto/crypto_core.h
index 36d8ace723..82df9c23a8 100644
--- a/core/crypto/crypto_core.h
+++ b/core/crypto/crypto_core.h
@@ -86,6 +86,8 @@ public:
Error set_decode_key(const uint8_t *p_key, size_t p_bits);
Error encrypt_ecb(const uint8_t p_src[16], uint8_t r_dst[16]);
Error decrypt_ecb(const uint8_t p_src[16], uint8_t r_dst[16]);
+ Error encrypt_cbc(size_t p_length, uint8_t r_iv[16], const uint8_t *p_src, uint8_t *r_dst);
+ Error decrypt_cbc(size_t p_length, uint8_t r_iv[16], const uint8_t *p_src, uint8_t *r_dst);
};
static String b64_encode_str(const uint8_t *p_src, int p_src_len);
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-24 15:27:35 +0000