Add Capability to store different types of keys or seed in atec

Signed-off-by: cybnon <stefan.weber93@googlemail.com>

Author: Cybnon

include/atecc608_handler.h

@@ -86,3 +86,5 @@ extern "C" int atecc_handler_sign(int slot, const uint8_t * msg, uint8_t * signa
 extern "C" int atecc_handler_verify(int slot, const uint8_t * msg, const uint8_t * signature, const uint8_t * pub_key);
 extern "C" int atecc_handler_genkey(int slot, uint8_t * pub_key);
 extern "C" int atecc_handler_lock_slot(int slot);
+extern "C" int atecc_handler_write_data(int slot, uint8_t* data, size_t data_len);
+extern "C" int atecc_handler_read_data(int slot, uint8_t* data, size_t data_len);

src/atecc608_handler.cpp

@@ -194,6 +194,92 @@ int atecc_handler_inject_priv_key(int slot, uint8_t* priv_key){
     return status;
 }
 
+    /** save data in slot
+ *  \param[in] slot slot number to which data is to be written
+ *  \param[in] data data byte array to write
+ *  \param[in] data_len length of the data byte array
+ *  \return ATCA_SUCCESS on success, otherwise an error code.
+ */
+int atecc_handler_write_data(int slot, uint8_t* data, size_t data_len) {
+    ATCA_STATUS status = ATCA_GEN_FAIL;
+    uint8_t config_data[128];
+
+    // Wake up the device
+    status = atcab_wakeup();
+    if (status != ATCA_SUCCESS) {
+        return status;
+    }
+
+    // Read the configuration zone
+    status = atecc_handler_read_configuration(config_data);
+    if (status != ATCA_SUCCESS) {
+        return status;
+    }
+
+    /* Check if writing is allowed for the given slot */
+    std::bitset<8> slotConfig_H = config_data[21 + (slot * 2)];
+    if (!slotConfig_H[6]) {  // Example condition; adapt as necessary
+        return ATCA_EXECUTION_ERROR;
+    }
+
+    /* Config Zone should be locked for this process */
+    status = check_lock_zone(LOCK_ZONE_CONFIG);
+    if (status == ATCA_NOT_LOCKED) {
+        return status;
+    }
+
+    // Write data to the specified slot
+    status = atcab_write_bytes_zone(ATCA_ZONE_DATA, slot, 0, data, data_len);
+    if (status != ATCA_SUCCESS) {
+        return status;
+    }
+
+    return ATCA_SUCCESS;
+}
+
+/* read data from slot
+ *  \param[in] slot slot number from which data is to be read
+ *  \param[out] data buffer to store the read data
+ *  \param[in] data_len length of the data byte array
+ *  \return ATCA_SUCCESS on success, otherwise an error code.
+ */
+int atecc_handler_read_data(int slot, uint8_t* data, size_t data_len) {
+    ATCA_STATUS status = ATCA_GEN_FAIL;
+    uint8_t config_data[128];
+
+    // Wake up the device
+    status = atcab_wakeup();
+    if (status != ATCA_SUCCESS) {
+        return status;
+    }
+
+    // Read the configuration zone
+    status = atecc_handler_read_configuration(config_data);
+    if (status != ATCA_SUCCESS) {
+        return status;
+    }
+
+    /* Check if reading is allowed for the given slot */
+    std::bitset<8> slotConfig_H = config_data[21 + (slot * 2)];
+    if (!slotConfig_H[6]) {  // Example condition; adapt as necessary
+        return ATCA_EXECUTION_ERROR;
+    }
+
+    /* Config Zone should be locked for this process */
+    status = check_lock_zone(LOCK_ZONE_CONFIG);
+    if (status == ATCA_NOT_LOCKED) {
+        return status;
+    }
+
+    // Read data from the specified slot
+    status = atcab_read_bytes_zone(ATCA_ZONE_DATA, slot, 0, data, data_len);
+    if (status != ATCA_SUCCESS) {
+        return status;
+    }
+
+    return ATCA_SUCCESS;
+}
+
 /** \brief Initialize atecc object and bus
  *  \param[in] slot slot number of key to be written
  *  \param[in] pub_key public key will be written here