[FL-1958] U2F prototype (#879)

* U2F implementation prototype
* U2F data encryption and store, user confirmation request
* remove debug prints
* fix notification bug in chrome
* split u2f_alloc into u2f_init and u2f_alloc
* typo fix, furi-hal-trng -> furi-hal-random
* rand/srand redefinition
* SubGhz: a little bit of Dante.
* u2f_data naming fix

Co-authored-by: Aleksandr Kutuzov <alleteam@gmail.com>

firmware/targets/f7/furi-hal/furi-hal-random.c

@@ -0,0 +1,56 @@
+#include "furi-hal-random.h"
+#include <furi.h>
+#include <furi-hal.h>
+
+#include <stm32wbxx_ll_rng.h>
+#include <stm32wbxx_ll_hsem.h>
+
+#include <hw_conf.h>
+
+uint32_t furi_hal_random_get() {
+
+    while( LL_HSEM_1StepLock(HSEM, CFG_HW_RNG_SEMID));
+    LL_RNG_Enable(RNG);
+
+    while (!LL_RNG_IsActiveFlag_DRDY(RNG));
+
+    if ((LL_RNG_IsActiveFlag_CECS(RNG)) || (LL_RNG_IsActiveFlag_SECS(RNG))) {
+        furi_crash("TRNG error");
+    }
+
+    uint32_t random_val = LL_RNG_ReadRandData32(RNG);
+
+    LL_RNG_Disable(RNG);
+    LL_HSEM_ReleaseLock(HSEM, CFG_HW_RNG_SEMID, 0);
+
+    return random_val;
+}
+
+void furi_hal_random_fill_buf(uint8_t* buf, uint32_t len) {
+
+    while( LL_HSEM_1StepLock(HSEM, CFG_HW_RNG_SEMID));
+    LL_RNG_Enable(RNG);
+
+    for (uint32_t i = 0; i < len; i+= 4) {
+        while (!LL_RNG_IsActiveFlag_DRDY(RNG));
+
+        if ((LL_RNG_IsActiveFlag_CECS(RNG)) || (LL_RNG_IsActiveFlag_SECS(RNG))) {
+            furi_crash("TRNG error");
+        }
+
+        uint32_t random_val = LL_RNG_ReadRandData32(RNG);
+
+        uint8_t len_cur = ((i+4) < len) ? (4) : (len-i);
+        memcpy(&buf[i], &random_val, len_cur);
+    }
+
+    LL_RNG_Disable(RNG);
+    LL_HSEM_ReleaseLock(HSEM, CFG_HW_RNG_SEMID, 0);
+}
+
+void srand(unsigned seed) {
+}
+
+int rand() {
+    return (furi_hal_random_get() & RAND_MAX);
+}