diff --git a/red_crypto.c b/red_crypto.c
index 761e7c4..15edd4a 100644
--- a/red_crypto.c
+++ b/red_crypto.c
@@ -4,7 +4,7 @@
 
 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}};
 
-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};
+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};
 
 uint8_t count_char_key = 0;
 
@@ -37,36 +37,41 @@ void decrypt_pass_kuzn(const uint8_t encrypted_passwords[2][16]) {
     kuz_key_t key;
     w128_t    x;
 
-    kuz_set_decrypt_key(&key, readed_key);
+    SHA256_CTX ctx;
+    sha256_init(&ctx);
+    sha256_update(&ctx,readed_key,MAX_KEY_LEN);
+    BYTE result_key[SHA256_BLOCK_SIZE];
+    sha256_final(&ctx,result_key);
+
+    kuz_set_decrypt_key(&key, result_key);
     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
+#ifdef USE_RED_CRY_DEBUG
         dprintf("decrypted\t=");
         print_w128(&x);
         print_chars_w128(&x);
-        #endif
+#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
 // and storing all these to EEPROM
 // void encrypt_pass_kuzn(){
-    // kuz_set_encrypt_key(&key,readed_key);
-    // for (uint8_t i=0; i<16; i++) {
-    //     x.b[i] = pass[i];
-    // }
-    // kuz_encrypt_block(&key,&x);
-    // printf("encrypted\t="); print_w128(&x);
-    // print_chars_w128(&x);
+// kuz_set_encrypt_key(&key,readed_key);
+// for (uint8_t i=0; i<16; i++) {
+//     x.b[i] = pass[i];
+// }
+// kuz_encrypt_block(&key,&x);
+// printf("encrypted\t="); print_w128(&x);
+// print_chars_w128(&x);
 // }
 
 void send_chars_pass(uint8_t *out) {
@@ -80,14 +85,15 @@ uint8_t crypto_process_record_user(uint16_t keycode, keyrecord_t *record, const
         switch (keycode) {
             case RED_CRY_M:
                 if (record->event.pressed) {
-                    #ifdef USE_RED_CRY_DEBUG
+#ifdef USE_RED_CRY_DEBUG
                     print_int(readed_key);
-                    #endif
+#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;
         }
diff --git a/red_crypto.h b/red_crypto.h
index 1c6d5a4..ef54510 100644
--- a/red_crypto.h
+++ b/red_crypto.h
@@ -21,6 +21,8 @@
 #        include "aes.h"
 #    endif
 
+#define MAX_KEY_LEN 128
+
 enum red_crypto_keys {
     RED_CRY_M = SAFE_RANGE + 0x80, // added safe range offset
     RED_RNG,
diff --git a/sha256.c b/sha256.c
index 59f7a3e..359e992 100644
--- a/sha256.c
+++ b/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"};
diff --git a/sha256.h b/sha256.h
index 0c38e15..a335da0 100644
--- a/sha256.h
+++ b/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