add hashing key with SHA256, update readme

README.md

@@ -5,15 +5,16 @@
 Password manager for (almost) any QMK keyboards. 
 Supports cryptographic algorithms:
 - [x] Kuznechik (Russian GOST cipher)
-- [ ] SHA256 (for hashing key)
+- [x] SHA256 (for hashing key)
+- [ ] Streebog (for hashing key, Russian GOST hash algorithm)
 - [ ] AES256
 
 ## Features and plans
 
 - [x] add read all ASCII-printable symbols for key
 - [x] add Kuznechik lib for non 128 bit MCU
-- [ ] use SHA256 for hashing key to set key length to 32 bytes
-- [ ] expand password length from 16 byte to 64
+- [x] use SHA256 for hashing key to set key length to 32 bytes
+- [ ] expand stored passwords length from 16 byte to 64
 - [ ] expand number of stored passwords, may be with auto-adding new keycodes
 - [ ] add CBC mode for Kuznechik, it will increase security
 
@@ -33,17 +34,25 @@ include keyboards/<your keyboard>/<path to your keymap folder>/red_crypto/red_cr
 #include "red_crypto/red_crypto.h"
 ```
 
-4. Enable chosen algorithms. Now you can use only `Kuznechik`. 
+4. Enable chosen algorithms with define in `config.h`. Now you can use only `Kuznechik`. 
 
 ```c
 #define USE_KUZNECHIK_8
 ```
 
+If you want use SHA256 of your key to encrypt passwords, define this in `config.h`.
+
+```c
+#define USE_SHA256_KEY
+```
+
 5. Encrypt your passwords with chosen algorithm (AES, Kuznechik). Now available only Kuznechik. You can use `CyberChef`. 
 
 > Don't use web version! We are here for security, right?
 
-Choose `GOST Encrypt`, then choose type `GOST R 34.12 (Kuznechik, 2015)`, not `Magma`. Choose mode `ECB`. Now, there is no other modes for `Kuznechik`.
+If you've enabled SHA256 for key, choose `SHA2`, then `SHA256` mode and `64` rounds. Hash your key, then copy it to next step.
+
+Choose `GOST Encrypt`, then choose type `GOST R 34.12 (Kuznechik, 2015)`, not `Magma`. Choose mode `ECB`. Now there is no other modes for `Kuznechik`.
 
 > Don't forget IV for GOST
  ```

red_crypto.c

@@ -4,7 +4,13 @@
 
 uint8_t dec_pass[2][16] = {{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}};
 
+//you can use key any length with SHA256, kuznechik use only 32byte
+#ifdef USE_SHA256_KEY
 uint8_t readed_key[128] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
+#endif
+#ifndef USE_SHA256_KEY
+uint8_t readed_key[32] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
+#endif
 
 uint8_t count_char_key = 0;
 
@@ -33,17 +39,36 @@ void print_int(uint8_t *c) {
     dprintf("\n");
 };
 
+void print_hex(uint8_t *h) {
+    for (uint8_t i = 0; i < 32; i++) {
+        dprintf("%x ", h[i]);
+    }
+    dprintf("\n");
+};
+
+size_t min_len(size_t a, size_t b) {
+    if (a < b)
+        return a;
+    else
+        return b;
+}
+
 void decrypt_pass_kuzn(const uint8_t encrypted_passwords[2][16]) {
     kuz_key_t key;
     w128_t    x;
 
+#ifdef USE_SHA256_KEY
     SHA256_CTX ctx;
     sha256_init(&ctx);
-    sha256_update(&ctx,readed_key,MAX_KEY_LEN);
+    sha256_update(&ctx, readed_key, min_len(u_strlen(readed_key), MAX_KEY_LEN));
     BYTE result_key[SHA256_BLOCK_SIZE];
     sha256_final(&ctx, result_key);
-
+    print_hex(result_key);
     kuz_set_decrypt_key(&key, result_key);
+#endif
+#ifndef USE_SHA256_KEY
+    kuz_set_decrypt_key(&key, readed_key);
+#endif
     for (uint8_t j = 0; j < 2; j++) {
         for (uint8_t i = 0; i < 16; i++) {
             x.b[i] = encrypted_passwords[j][i];

red_crypto.h

@@ -14,8 +14,10 @@
 
 #    ifdef USE_RED_KUZNECHIK_8
 #        include "kuznechik_8bit.h"
+#        ifdef USE_SHA256_KEY
 #            include "sha256.h"
 #        endif
+#    endif
 
 #    ifdef USE_RED_AES_256
 #        include "aes.h"