add hashing key with SHA256, update readme

README.md

@@ -1,41 +1,65 @@
-# RED_CRYPTO ver 0.2.0
+# RED_CRYPTO ver 0.3.0
 
 ## Description
 
 Password manager for (almost) any QMK keyboards. 
 Supports cryptographic algorithms:
-- [ ] AES256,
-- [x] Kuznechik (Russian GOST cipher),
-- [ ] SHA256. 
+- [x] Kuznechik (Russian GOST cipher)
+- [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
+- [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
 
 ## Installation
 
 1. Clone this repo to your keymap folder.
 
-2. Copy this string to *rules.mk*. Don't forget to insert your names. This is make rules for including all needed file to firmwire.
+2. Copy this string to **rules.mk**. Don't forget to insert your names. This is make rules for including all needed file to firmwire.
 
 ```make
-include keyboards/<keyboard>/<path to your keymap folder>/red_crypto/red_crypto.mk 
+include keyboards/<your keyboard>/<path to your keymap folder>/red_crypto/red_crypto.mk 
 ```
 
-3. Import library in *keymap.c*.
+3. Import library in **keymap.c**.
 
 ```c
 #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
 ```
 
-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 Cipher`, then choose type `Kuznechik 34.12-2014`, not Magma. Choose mode ECB. Now, there is no CBC or CTR. 
+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?
+
+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
-> ```94208510C2C001FB01C0C21085209401```
+ ```
+ 94208510C2C001FB01C0C21085209401
+ ```
 
-6. Add your encrypted passwords in "keymap.c". Now you can encrypt 2 passwords with length <=16 byte. Keep this information in secret. Even if there are no plaintext. 
+6. Add your encrypted passwords in **keymap.c**. Now you can encrypt 2 passwords with length <=16 byte. Keep this information in secret. Even if there are no plaintext. 
 
 ```c
 const uint8_t encrypted_passwords[2][16] = { {0,0,0,...,0,0,0}, {0,0,0,...,0,0,0} };
@@ -44,22 +68,33 @@ const uint8_t encrypted_passwords[2][16] = { {0,0,0,...,0,0,0}, {0,0,0,...,0,0,0
 7. Add new layer or set new keyes everywhere you want.
 
 - `RED_TEST` - execute test functions of every algorithm with. Available only with `#define TEST_FUNCTIONS_ENABLED` and `COMMAND_ENABLE=yes`. You can see output via `hid_listen`.
-- `GET_PASS` - execute reading password for encrypted passwords. After entering password, tap this key again. Now, you can use `RED_PASSX` keys.
+- `RED_CRY_M` - execute reading password for encrypted passwords. After entering password, tap this key again. Now, you can use `RED_PASSX` keys.
 - `RED_PASSX` - where `X` is number of your password in database. After tapping, keyboard send decrypted password.
 - `RED_RNG` - use 32 times function named `tap_random_base64` from QMK. It's for generating random strings. But now random seed is not unique for every keyboard's power on.  
 
-8. Copy this string to function *process_record_user* in *keymap.c* before all your code. It uses "switch case" construction inside. 
+8. Copy this string to function **process_record_user** in **keymap.c** before all your code. It uses "switch case" construction inside. 
 
 ```c
-    crypto_process_record_user(keycode,event,encrypted_passwords);
+    uint8_t crypto_return = crypto_process_record_user(keycode, event, encrypted_passwords);
+    if (crypto_return == 1){
+        return false;
+    }
 ```
 
-9. Flash your keyboard.
+9. Compile and flash your keyboard.
 
 
 ## Usage
 
-Tap `GET_PASS`. Enter password. Tap `GET_PASS` again to confirm.
+Tap `RED_CRY_M`. Enter password. Tap `RED_CRY_M` again to confirm.
 Now you can use `RED_PASSX` to send decrypted passwords.
 
-If you have missed while entering password, just tap `GET_PASS` and tap `GET_PASS`. 
+If you have missed while entering password, just tap `RED_CRY_M` and tap `RED_CRY_M`. 
+
+
+## Related projects
+
+Thanks to the authors of these repositories:
+
+- https://github.com/mjosaarinen/kuznechik - kuznechik implementation for 8bit and 128bit
+- https://github.com/B-Con/crypto-algorithms - other crypto algorithms

kc_to_ascii.c

@@ -12,7 +12,9 @@ void write_keycode(uint8_t up_key, uint8_t low_key, keyrecord_t *record, uint8_t
         } else {
             readed_key[*count_char_key] = low_key;
         }
+#ifdef USE_RED_CRY_DEBUG
         dprintf("%d", readed_key[*count_char_key]);
+#endif
         *count_char_key = *count_char_key + 1;
     }
 };

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;
 
@@ -13,7 +19,7 @@ uint8_t crypto_mode = 0;
 void print_chars_w128(w128_t *x) {
     for (uint8_t i = 0; i < 16; i++) {
         if (x->b[i] == 0x00) break;
-        printf("%c", x->b[i]);
+        dprintf("%c", x->b[i]);
     }
     dprintf("\n");
 };
@@ -21,38 +27,64 @@ void print_chars_w128(w128_t *x) {
 void print_chars(uint8_t *c) {
     for (uint8_t i = 0; i < 32; i++) {
         if (c[i] == 0x00) break;
-        printf("%c", c[i]);
+        dprintf("%c", c[i]);
     }
     dprintf("\n");
 };
 
 void print_int(uint8_t *c) {
     for (uint8_t i = 0; i < 32; i++) {
-        printf("%d", c[i]);
+        dprintf("%d", c[i]);
     }
     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, 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];
         }
         kuz_decrypt_block(&key, &x);
 
+#ifdef USE_RED_CRY_DEBUG
         dprintf("decrypted\t=");
         print_w128(&x);
         print_chars_w128(&x);
+#endif
 
         for (uint8_t i = 0; i < 16; i++) {
             dec_pass[j][i] = x.b[i];
         }
     }
-
 };
 
 // TODO: add encrypt new passwords with binding on new keys
@@ -76,21 +108,17 @@ void send_chars_pass(uint8_t *out) {
 uint8_t crypto_process_record_user(uint16_t keycode, keyrecord_t *record, const uint8_t encrypted_passwords[2][16]) {
     if (crypto_mode) {
         switch (keycode) {
-            // case KC_1:
-            //     if (record->event.pressed) {
-            //         readed_key[count_char_key] = ASCII_LOW_1;
-            //         count_char_key++;
-            //     }
-            //     return 1;
-            //     break;
             case RED_CRY_M:
                 if (record->event.pressed) {
+#ifdef USE_RED_CRY_DEBUG
                     print_int(readed_key);
+#endif
                     crypto_mode    = 0;
                     count_char_key = 0;
                     decrypt_pass_kuzn(encrypted_passwords);
                 }
             default:
+                // reading key
                 return kc_to_ascii(keycode, record, readed_key, &count_char_key);
                 break;
         }

red_crypto.h

@@ -3,7 +3,6 @@
 #include QMK_KEYBOARD_H
 #include "quantum.h"
 
-
 #ifndef RED_CRYPTO_H
 #    define RED_CRYPTO_H
 
@@ -12,28 +11,28 @@
 // #ifdef USE_RED_KUZNECHIK_128
 // #include "kuznechik_128bit.h"
 // #endif
+
 #    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"
 #    endif
 
-
+#    define MAX_KEY_LEN 128
 
 enum red_crypto_keys {
     RED_CRY_M = SAFE_RANGE + 0x80, // added safe range offset
-    RED_PASS1,
-    RED_PASS2,
     RED_RNG,
-    RED_TEST
+    RED_TEST,
+    RED_PASS1,
+    RED_PASS2
 };
 
 uint8_t crypto_process_record_user(uint16_t keycode, keyrecord_t *record, const uint8_t encrypted_passwords[2][16]);
 
-
 #endif
-
-

sha256.c

@@ -158,13 +158,14 @@ void sha256_final(SHA256_CTX *ctx, BYTE hash[])
 	}
 }
 
-/*********************** TEST FUNCTION DEFINITIONS ***********************/
-#ifdef TEST_FUNCTIONS_ENABLED
-inline size_t u_strlen(const unsigned char * array)
+size_t u_strlen(const unsigned char * array)
 {
     return strlen((const char*)array);
 }
 
+/*********************** TEST FUNCTION DEFINITIONS ***********************/
+#ifdef TEST_FUNCTIONS_ENABLED
+
 void exec_sha256_test(void)
 {
 	BYTE text1[] = {"abc"};

sha256.h

@@ -31,6 +31,7 @@ typedef struct {
 void sha256_init(SHA256_CTX *ctx);
 void sha256_update(SHA256_CTX *ctx, const BYTE data[], size_t len);
 void sha256_final(SHA256_CTX *ctx, BYTE hash[]);
+size_t u_strlen(const unsigned char * array);
 
 // test
 #ifdef TEST_FUNCTIONS_ENABLED