From f043eabdd84a509abf5266bb444d19af3e26b7c6 Mon Sep 17 00:00:00 2001
From: bruvzg <7645683+bruvzg@users.noreply.github.com>
Date: Tue, 28 Apr 2020 20:51:29 +0300
Subject: Adds PCK encryption support (using script encryption key for export).
 Change default encryption mode from ECB to CFB.

---
 core/crypto/crypto_core.cpp | 20 ++++++++++++++++----
 core/crypto/crypto_core.h   |  2 ++
 2 files changed, 18 insertions(+), 4 deletions(-)

(limited to 'core/crypto')

diff --git a/core/crypto/crypto_core.cpp b/core/crypto/crypto_core.cpp
index b0dc47e655..117e47d538 100644
--- a/core/crypto/crypto_core.cpp
+++ b/core/crypto/crypto_core.cpp
@@ -140,13 +140,19 @@ Error CryptoCore::AESContext::encrypt_ecb(const uint8_t p_src[16], uint8_t r_dst
 	return ret ? FAILED : OK;
 }
 
-Error CryptoCore::AESContext::decrypt_ecb(const uint8_t p_src[16], uint8_t r_dst[16]) {
-	int ret = mbedtls_aes_crypt_ecb((mbedtls_aes_context *)ctx, MBEDTLS_AES_DECRYPT, p_src, r_dst);
+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::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);
+Error CryptoCore::AESContext::encrypt_cfb(size_t p_length, uint8_t p_iv[16], const uint8_t *p_src, uint8_t *r_dst) {
+	size_t iv_off = 0; // Ignore and assume 16-byte alignment.
+	int ret = mbedtls_aes_crypt_cfb128((mbedtls_aes_context *)ctx, MBEDTLS_AES_ENCRYPT, p_length, &iv_off, p_iv, p_src, r_dst);
+	return ret ? FAILED : OK;
+}
+
+Error CryptoCore::AESContext::decrypt_ecb(const uint8_t p_src[16], uint8_t r_dst[16]) {
+	int ret = mbedtls_aes_crypt_ecb((mbedtls_aes_context *)ctx, MBEDTLS_AES_DECRYPT, p_src, r_dst);
 	return ret ? FAILED : OK;
 }
 
@@ -155,6 +161,12 @@ Error CryptoCore::AESContext::decrypt_cbc(size_t p_length, uint8_t r_iv[16], con
 	return ret ? FAILED : OK;
 }
 
+Error CryptoCore::AESContext::decrypt_cfb(size_t p_length, uint8_t p_iv[16], const uint8_t *p_src, uint8_t *r_dst) {
+	size_t iv_off = 0; // Ignore and assume 16-byte alignment.
+	int ret = mbedtls_aes_crypt_cfb128((mbedtls_aes_context *)ctx, MBEDTLS_AES_DECRYPT, p_length, &iv_off, p_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 82df9c23a8..9ab2871caa 100644
--- a/core/crypto/crypto_core.h
+++ b/core/crypto/crypto_core.h
@@ -88,6 +88,8 @@ public:
 		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);
+		Error encrypt_cfb(size_t p_length, uint8_t p_iv[16], const uint8_t *p_src, uint8_t *r_dst);
+		Error decrypt_cfb(size_t p_length, uint8_t p_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);
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