警告

This document is not updated for ESP32C61 yet, so some of the content may not be correct.

This warning was automatically inserted due to the source file being in the add_warnings_pages list.

# 错误代码参考

[English]

本节列出了 ESP-IDF 中定义的各种错误代码常量。

有关 ESP-IDF 中出错处理的通用信息，请参见 错误处理。

`ESP_FAIL` (-1): Generic esp_err_t code indicating failure

`ESP_OK` (0): esp_err_t value indicating success (no error)

`ESP_ERR_NO_MEM` (0x101): Out of memory

`ESP_ERR_INVALID_ARG` (0x102): Invalid argument

`ESP_ERR_INVALID_STATE` (0x103): Invalid state

`ESP_ERR_INVALID_SIZE` (0x104): Invalid size

`ESP_ERR_NOT_FOUND` (0x105): Requested resource not found

`ESP_ERR_NOT_SUPPORTED` (0x106): Operation or feature not supported

`ESP_ERR_TIMEOUT` (0x107): Operation timed out

`ESP_ERR_INVALID_RESPONSE` (0x108): Received response was invalid

`ESP_ERR_INVALID_CRC` (0x109): CRC or checksum was invalid

`ESP_ERR_INVALID_VERSION` (0x10a): Version was invalid

`ESP_ERR_INVALID_MAC` (0x10b): MAC address was invalid

`ESP_ERR_NOT_FINISHED` (0x10c): Operation has not fully completed

`ESP_ERR_NOT_ALLOWED` (0x10d): Operation is not allowed

`ESP_ERR_NVS_BASE` (0x1100): Starting number of error codes

`ESP_ERR_NVS_NOT_INITIALIZED` (0x1101): The storage driver is not initialized

`ESP_ERR_NVS_NOT_FOUND` (0x1102): A requested entry couldn't be found or namespace doesn’t exist yet and mode is NVS_READONLY

`ESP_ERR_NVS_TYPE_MISMATCH` (0x1103): The type of set or get operation doesn't match the type of value stored in NVS

`ESP_ERR_NVS_READ_ONLY` (0x1104): Storage handle was opened as read only

`ESP_ERR_NVS_NOT_ENOUGH_SPACE` (0x1105): There is not enough space in the underlying storage to save the value

`ESP_ERR_NVS_INVALID_NAME` (0x1106): Namespace name doesn’t satisfy constraints

`ESP_ERR_NVS_INVALID_HANDLE` (0x1107): Handle has been closed or is NULL

`ESP_ERR_NVS_REMOVE_FAILED` (0x1108): The value wasn’t updated because flash write operation has failed. The value was written however, and update will be finished after re-initialization of nvs, provided that flash operation doesn’t fail again.

`ESP_ERR_NVS_KEY_TOO_LONG` (0x1109): Key name is too long

`ESP_ERR_NVS_PAGE_FULL` (0x110a): Internal error; never returned by nvs API functions

`ESP_ERR_NVS_INVALID_STATE` (0x110b): NVS is in an inconsistent state due to a previous error. Call nvs_flash_init and nvs_open again, then retry.

`ESP_ERR_NVS_INVALID_LENGTH` (0x110c): String or blob length is not sufficient to store data

`ESP_ERR_NVS_NO_FREE_PAGES` (0x110d): NVS partition doesn't contain any empty pages. This may happen if NVS partition was truncated. Erase the whole partition and call nvs_flash_init again.

`ESP_ERR_NVS_VALUE_TOO_LONG` (0x110e): Value doesn't fit into the entry or string or blob length is longer than supported by the implementation

`ESP_ERR_NVS_PART_NOT_FOUND` (0x110f): Partition with specified name is not found in the partition table

`ESP_ERR_NVS_NEW_VERSION_FOUND` (0x1110): NVS partition contains data in new format and cannot be recognized by this version of code

`ESP_ERR_NVS_XTS_ENCR_FAILED` (0x1111): XTS encryption failed while writing NVS entry

`ESP_ERR_NVS_XTS_DECR_FAILED` (0x1112): XTS decryption failed while reading NVS entry

`ESP_ERR_NVS_XTS_CFG_FAILED` (0x1113): XTS configuration setting failed

`ESP_ERR_NVS_XTS_CFG_NOT_FOUND` (0x1114): XTS configuration not found

`ESP_ERR_NVS_ENCR_NOT_SUPPORTED` (0x1115): NVS encryption is not supported in this version

`ESP_ERR_NVS_KEYS_NOT_INITIALIZED` (0x1116): NVS key partition is uninitialized

`ESP_ERR_NVS_CORRUPT_KEY_PART` (0x1117): NVS key partition is corrupt

`ESP_ERR_NVS_CONTENT_DIFFERS` (0x1118): Internal error; never returned by nvs API functions. NVS key is different in comparison

`ESP_ERR_NVS_WRONG_ENCRYPTION` (0x1119): NVS partition is marked as encrypted with generic flash encryption. This is forbidden since the NVS encryption works differently.

`ESP_ERR_ULP_BASE` (0x1200): Offset for ULP-related error codes

`ESP_ERR_ULP_SIZE_TOO_BIG` (0x1201): Program doesn't fit into RTC memory reserved for the ULP

`ESP_ERR_ULP_INVALID_LOAD_ADDR` (0x1202): Load address is outside of RTC memory reserved for the ULP

`ESP_ERR_ULP_DUPLICATE_LABEL` (0x1203): More than one label with the same number was defined

`ESP_ERR_ULP_UNDEFINED_LABEL` (0x1204): Branch instructions references an undefined label

`ESP_ERR_ULP_BRANCH_OUT_OF_RANGE` (0x1205): Branch target is out of range of B instruction (try replacing with BX)

`ESP_ERR_OTA_BASE` (0x1500): Base error code for ota_ops api

`ESP_ERR_OTA_PARTITION_CONFLICT` (0x1501): Error if request was to write or erase the current running partition

`ESP_ERR_OTA_SELECT_INFO_INVALID` (0x1502): Error if OTA data partition contains invalid content

`ESP_ERR_OTA_VALIDATE_FAILED` (0x1503): Error if OTA app image is invalid

`ESP_ERR_OTA_SMALL_SEC_VER` (0x1504): Error if the firmware has a secure version less than the running firmware.

`ESP_ERR_OTA_ROLLBACK_FAILED` (0x1505): Error if flash does not have valid firmware in passive partition and hence rollback is not possible

`ESP_ERR_OTA_ROLLBACK_INVALID_STATE` (0x1506): Error if current active firmware is still marked in pending validation state (ESP_OTA_IMG_PENDING_VERIFY), essentially first boot of firmware image post upgrade and hence firmware upgrade is not possible

`ESP_ERR_EFUSE` (0x1600): Base error code for efuse api.

`ESP_OK_EFUSE_CNT` (0x1601): OK the required number of bits is set.

`ESP_ERR_EFUSE_CNT_IS_FULL` (0x1602): Error field is full.

`ESP_ERR_EFUSE_REPEATED_PROG` (0x1603): Error repeated programming of programmed bits is strictly forbidden.

`ESP_ERR_CODING` (0x1604): Error while a encoding operation.

`ESP_ERR_NOT_ENOUGH_UNUSED_KEY_BLOCKS` (0x1605): Error not enough unused key blocks available

`ESP_ERR_DAMAGED_READING` (0x1606): Error. Burn or reset was done during a reading operation leads to damage read data. This error is internal to the efuse component and not returned by any public API.

`ESP_ERR_IMAGE_BASE` (0x2000)

`ESP_ERR_IMAGE_FLASH_FAIL` (0x2001)

`ESP_ERR_IMAGE_INVALID` (0x2002)

`ESP_ERR_WIFI_BASE` (0x3000): Starting number of WiFi error codes

`ESP_ERR_WIFI_NOT_INIT` (0x3001): WiFi driver was not installed by esp_wifi_init

`ESP_ERR_WIFI_NOT_STARTED` (0x3002): WiFi driver was not started by esp_wifi_start

`ESP_ERR_WIFI_NOT_STOPPED` (0x3003): WiFi driver was not stopped by esp_wifi_stop

`ESP_ERR_WIFI_IF` (0x3004): WiFi interface error

`ESP_ERR_WIFI_MODE` (0x3005): WiFi mode error

`ESP_ERR_WIFI_STATE` (0x3006): WiFi internal state error

`ESP_ERR_WIFI_CONN` (0x3007): WiFi internal control block of station or soft-AP error

`ESP_ERR_WIFI_NVS` (0x3008): WiFi internal NVS module error

`ESP_ERR_WIFI_MAC` (0x3009): MAC address is invalid

`ESP_ERR_WIFI_SSID` (0x300a): SSID is invalid

`ESP_ERR_WIFI_PASSWORD` (0x300b): Password is invalid

`ESP_ERR_WIFI_TIMEOUT` (0x300c): Timeout error

`ESP_ERR_WIFI_WAKE_FAIL` (0x300d): WiFi is in sleep state(RF closed) and wakeup fail

`ESP_ERR_WIFI_WOULD_BLOCK` (0x300e): The caller would block

`ESP_ERR_WIFI_NOT_CONNECT` (0x300f): Station still in disconnect status

`ESP_ERR_WIFI_POST` (0x3012): Failed to post the event to WiFi task

`ESP_ERR_WIFI_INIT_STATE` (0x3013): Invalid WiFi state when init/deinit is called

`ESP_ERR_WIFI_STOP_STATE` (0x3014): Returned when WiFi is stopping

`ESP_ERR_WIFI_NOT_ASSOC` (0x3015): The WiFi connection is not associated

`ESP_ERR_WIFI_TX_DISALLOW` (0x3016): The WiFi TX is disallowed

`ESP_ERR_WIFI_TWT_FULL` (0x3017): no available flow id

`ESP_ERR_WIFI_TWT_SETUP_TIMEOUT` (0x3018): Timeout of receiving twt setup response frame, timeout times can be set during twt setup

`ESP_ERR_WIFI_TWT_SETUP_TXFAIL` (0x3019): TWT setup frame tx failed

`ESP_ERR_WIFI_TWT_SETUP_REJECT` (0x301a): The twt setup request was rejected by the AP

`ESP_ERR_WIFI_DISCARD` (0x301b): Discard frame

`ESP_ERR_WIFI_ROC_IN_PROGRESS` (0x301c): ROC op is in progress

`ESP_ERR_WIFI_REGISTRAR` (0x3033): WPS registrar is not supported

`ESP_ERR_WIFI_WPS_TYPE` (0x3034): WPS type error

`ESP_ERR_WIFI_WPS_SM` (0x3035): WPS state machine is not initialized

`ESP_ERR_ESPNOW_BASE` (0x3064): ESPNOW error number base.

`ESP_ERR_ESPNOW_NOT_INIT` (0x3065): ESPNOW is not initialized.

`ESP_ERR_ESPNOW_ARG` (0x3066): Invalid argument

`ESP_ERR_ESPNOW_NO_MEM` (0x3067): Out of memory

`ESP_ERR_ESPNOW_FULL` (0x3068): ESPNOW peer list is full

`ESP_ERR_ESPNOW_NOT_FOUND` (0x3069): ESPNOW peer is not found

`ESP_ERR_ESPNOW_INTERNAL` (0x306a): Internal error

`ESP_ERR_ESPNOW_EXIST` (0x306b): ESPNOW peer has existed

`ESP_ERR_ESPNOW_IF` (0x306c): Interface error

`ESP_ERR_ESPNOW_CHAN` (0x306d): Channel error

`ESP_ERR_DPP_FAILURE` (0x3097): Generic failure during DPP Operation

`ESP_ERR_DPP_TX_FAILURE` (0x3098): DPP Frame Tx failed OR not Acked

`ESP_ERR_DPP_INVALID_ATTR` (0x3099): Encountered invalid DPP Attribute

`ESP_ERR_DPP_AUTH_TIMEOUT` (0x309a): DPP Auth response was not received in time

`ESP_ERR_DPP_INVALID_LIST` (0x309b): Channel list given in esp_supp_dpp_bootstrap_gen() is not valid or too big

`ESP_ERR_MESH_BASE` (0x4000): Starting number of MESH error codes

`ESP_ERR_MESH_WIFI_NOT_START` (0x4001)

`ESP_ERR_MESH_NOT_INIT` (0x4002)

`ESP_ERR_MESH_NOT_CONFIG` (0x4003)

`ESP_ERR_MESH_NOT_START` (0x4004)

`ESP_ERR_MESH_NOT_SUPPORT` (0x4005)

`ESP_ERR_MESH_NOT_ALLOWED` (0x4006)

`ESP_ERR_MESH_NO_MEMORY` (0x4007)

`ESP_ERR_MESH_ARGUMENT` (0x4008)

`ESP_ERR_MESH_EXCEED_MTU` (0x4009)

`ESP_ERR_MESH_TIMEOUT` (0x400a)

`ESP_ERR_MESH_DISCONNECTED` (0x400b)

`ESP_ERR_MESH_QUEUE_FAIL` (0x400c)

`ESP_ERR_MESH_QUEUE_FULL` (0x400d)

`ESP_ERR_MESH_NO_PARENT_FOUND` (0x400e)

`ESP_ERR_MESH_NO_ROUTE_FOUND` (0x400f)

`ESP_ERR_MESH_OPTION_NULL` (0x4010)

`ESP_ERR_MESH_OPTION_UNKNOWN` (0x4011)

`ESP_ERR_MESH_XON_NO_WINDOW` (0x4012)

`ESP_ERR_MESH_INTERFACE` (0x4013)

`ESP_ERR_MESH_DISCARD_DUPLICATE` (0x4014)

`ESP_ERR_MESH_DISCARD` (0x4015)

`ESP_ERR_MESH_VOTING` (0x4016)

`ESP_ERR_MESH_XMIT` (0x4017)

`ESP_ERR_MESH_QUEUE_READ` (0x4018)

`ESP_ERR_MESH_PS` (0x4019)

`ESP_ERR_MESH_RECV_RELEASE` (0x401a)

`ESP_ERR_ESP_NETIF_BASE` (0x5000)

`ESP_ERR_ESP_NETIF_INVALID_PARAMS` (0x5001)

`ESP_ERR_ESP_NETIF_IF_NOT_READY` (0x5002)

`ESP_ERR_ESP_NETIF_DHCPC_START_FAILED` (0x5003)

`ESP_ERR_ESP_NETIF_DHCP_ALREADY_STARTED` (0x5004)

`ESP_ERR_ESP_NETIF_DHCP_ALREADY_STOPPED` (0x5005)

`ESP_ERR_ESP_NETIF_NO_MEM` (0x5006)

`ESP_ERR_ESP_NETIF_DHCP_NOT_STOPPED` (0x5007)

`ESP_ERR_ESP_NETIF_DRIVER_ATTACH_FAILED` (0x5008)

`ESP_ERR_ESP_NETIF_INIT_FAILED` (0x5009)

`ESP_ERR_ESP_NETIF_DNS_NOT_CONFIGURED` (0x500a)

`ESP_ERR_ESP_NETIF_MLD6_FAILED` (0x500b)

`ESP_ERR_ESP_NETIF_IP6_ADDR_FAILED` (0x500c)

`ESP_ERR_ESP_NETIF_DHCPS_START_FAILED` (0x500d)

`ESP_ERR_ESP_NETIF_TX_FAILED` (0x500e)

`ESP_ERR_FLASH_BASE` (0x6000): Starting number of flash error codes

`ESP_ERR_FLASH_OP_FAIL` (0x6001)

`ESP_ERR_FLASH_OP_TIMEOUT` (0x6002)

`ESP_ERR_FLASH_NOT_INITIALISED` (0x6003)

`ESP_ERR_FLASH_UNSUPPORTED_HOST` (0x6004)

`ESP_ERR_FLASH_UNSUPPORTED_CHIP` (0x6005)

`ESP_ERR_FLASH_PROTECTED` (0x6006)

`ESP_ERR_HTTP_BASE` (0x7000): Starting number of HTTP error codes

`ESP_ERR_HTTP_MAX_REDIRECT` (0x7001): The error exceeds the number of HTTP redirects

`ESP_ERR_HTTP_CONNECT` (0x7002): Error open the HTTP connection

`ESP_ERR_HTTP_WRITE_DATA` (0x7003): Error write HTTP data

`ESP_ERR_HTTP_FETCH_HEADER` (0x7004): Error read HTTP header from server

`ESP_ERR_HTTP_INVALID_TRANSPORT` (0x7005): There are no transport support for the input scheme

`ESP_ERR_HTTP_CONNECTING` (0x7006): HTTP connection hasn't been established yet

`ESP_ERR_HTTP_EAGAIN` (0x7007): Mapping of errno EAGAIN to esp_err_t

`ESP_ERR_HTTP_CONNECTION_CLOSED` (0x7008): Read FIN from peer and the connection closed

`ESP_ERR_HTTP_NOT_MODIFIED` (0x7009): HTTP 304 Not Modified, no update available

`ESP_ERR_HTTP_RANGE_NOT_SATISFIABLE` (0x700a): HTTP 416 Range Not Satisfiable, requested range in header is incorrect

`ESP_ERR_HTTP_READ_TIMEOUT` (0x700b): HTTP data read timeout

`ESP_ERR_HTTP_INCOMPLETE_DATA` (0x700c): Incomplete data received, less than Content-Length or last chunk

`ESP_ERR_ESP_TLS_BASE` (0x8000): Starting number of ESP-TLS error codes

`ESP_ERR_ESP_TLS_CANNOT_RESOLVE_HOSTNAME` (0x8001): Error if hostname couldn't be resolved upon tls connection

`ESP_ERR_ESP_TLS_CANNOT_CREATE_SOCKET` (0x8002): Failed to create socket

`ESP_ERR_ESP_TLS_UNSUPPORTED_PROTOCOL_FAMILY` (0x8003): Unsupported protocol family

`ESP_ERR_ESP_TLS_FAILED_CONNECT_TO_HOST` (0x8004): Failed to connect to host

`ESP_ERR_ESP_TLS_SOCKET_SETOPT_FAILED` (0x8005): failed to set/get socket option

`ESP_ERR_ESP_TLS_CONNECTION_TIMEOUT` (0x8006): new connection in esp_tls_low_level_conn connection timeouted

`ESP_ERR_ESP_TLS_SE_FAILED` (0x8007)

`ESP_ERR_ESP_TLS_TCP_CLOSED_FIN` (0x8008)

`ESP_ERR_MBEDTLS_CERT_PARTLY_OK` (0x8010): mbedtls parse certificates was partly successful

`ESP_ERR_MBEDTLS_CTR_DRBG_SEED_FAILED` (0x8011): mbedtls api returned error

`ESP_ERR_MBEDTLS_SSL_SET_HOSTNAME_FAILED` (0x8012): mbedtls api returned error

`ESP_ERR_MBEDTLS_SSL_CONFIG_DEFAULTS_FAILED` (0x8013): mbedtls api returned error

`ESP_ERR_MBEDTLS_SSL_CONF_ALPN_PROTOCOLS_FAILED` (0x8014): mbedtls api returned error

`ESP_ERR_MBEDTLS_X509_CRT_PARSE_FAILED` (0x8015): mbedtls api returned error

`ESP_ERR_MBEDTLS_SSL_CONF_OWN_CERT_FAILED` (0x8016): mbedtls api returned error

`ESP_ERR_MBEDTLS_SSL_SETUP_FAILED` (0x8017): mbedtls api returned error

`ESP_ERR_MBEDTLS_SSL_WRITE_FAILED` (0x8018): mbedtls api returned error

`ESP_ERR_MBEDTLS_PK_PARSE_KEY_FAILED` (0x8019): mbedtls api returned failed

`ESP_ERR_MBEDTLS_SSL_HANDSHAKE_FAILED` (0x801a): mbedtls api returned failed

`ESP_ERR_MBEDTLS_SSL_CONF_PSK_FAILED` (0x801b): mbedtls api returned failed

`ESP_ERR_MBEDTLS_SSL_TICKET_SETUP_FAILED` (0x801c): mbedtls api returned failed

`ESP_ERR_WOLFSSL_SSL_SET_HOSTNAME_FAILED` (0x8031): wolfSSL api returned error

`ESP_ERR_WOLFSSL_SSL_CONF_ALPN_PROTOCOLS_FAILED` (0x8032): wolfSSL api returned error

`ESP_ERR_WOLFSSL_CERT_VERIFY_SETUP_FAILED` (0x8033): wolfSSL api returned error

`ESP_ERR_WOLFSSL_KEY_VERIFY_SETUP_FAILED` (0x8034): wolfSSL api returned error

`ESP_ERR_WOLFSSL_SSL_HANDSHAKE_FAILED` (0x8035): wolfSSL api returned failed

`ESP_ERR_WOLFSSL_CTX_SETUP_FAILED` (0x8036): wolfSSL api returned failed

`ESP_ERR_WOLFSSL_SSL_SETUP_FAILED` (0x8037): wolfSSL api returned failed

`ESP_ERR_WOLFSSL_SSL_WRITE_FAILED` (0x8038): wolfSSL api returned failed

`ESP_ERR_HTTPS_OTA_BASE` (0x9000)

`ESP_ERR_HTTPS_OTA_IN_PROGRESS` (0x9001)

`ESP_ERR_PING_BASE` (0xa000)

`ESP_ERR_PING_INVALID_PARAMS` (0xa001)

`ESP_ERR_PING_NO_MEM` (0xa002)

`ESP_ERR_HTTPD_BASE` (0xb000): Starting number of HTTPD error codes

`ESP_ERR_HTTPD_HANDLERS_FULL` (0xb001): All slots for registering URI handlers have been consumed

`ESP_ERR_HTTPD_HANDLER_EXISTS` (0xb002): URI handler with same method and target URI already registered

`ESP_ERR_HTTPD_INVALID_REQ` (0xb003): Invalid request pointer

`ESP_ERR_HTTPD_RESULT_TRUNC` (0xb004): Result string truncated

`ESP_ERR_HTTPD_RESP_HDR` (0xb005): Response header field larger than supported

`ESP_ERR_HTTPD_RESP_SEND` (0xb006): Error occurred while sending response packet

`ESP_ERR_HTTPD_ALLOC_MEM` (0xb007): Failed to dynamically allocate memory for resource

`ESP_ERR_HTTPD_TASK` (0xb008): Failed to launch server task/thread

`ESP_ERR_HW_CRYPTO_BASE` (0xc000): Starting number of HW cryptography module error codes

`ESP_ERR_HW_CRYPTO_DS_HMAC_FAIL` (0xc001): HMAC peripheral problem

`ESP_ERR_HW_CRYPTO_DS_INVALID_KEY` (0xc002)

`ESP_ERR_HW_CRYPTO_DS_INVALID_DIGEST` (0xc004)

`ESP_ERR_HW_CRYPTO_DS_INVALID_PADDING` (0xc005)

`ESP_ERR_MEMPROT_BASE` (0xd000): Starting number of Memory Protection API error codes

`ESP_ERR_MEMPROT_MEMORY_TYPE_INVALID` (0xd001)

`ESP_ERR_MEMPROT_SPLIT_ADDR_INVALID` (0xd002)

`ESP_ERR_MEMPROT_SPLIT_ADDR_OUT_OF_RANGE` (0xd003)

`ESP_ERR_MEMPROT_SPLIT_ADDR_UNALIGNED` (0xd004)

`ESP_ERR_MEMPROT_UNIMGMT_BLOCK_INVALID` (0xd005)

`ESP_ERR_MEMPROT_WORLD_INVALID` (0xd006)

`ESP_ERR_MEMPROT_AREA_INVALID` (0xd007)

`ESP_ERR_MEMPROT_CPUID_INVALID` (0xd008)

`ESP_ERR_TCP_TRANSPORT_BASE` (0xe000): Starting number of TCP Transport error codes

`ESP_ERR_TCP_TRANSPORT_CONNECTION_TIMEOUT` (0xe001): Connection has timed out

`ESP_ERR_TCP_TRANSPORT_CONNECTION_CLOSED_BY_FIN` (0xe002): Read FIN from peer and the connection has closed (in a clean way)

`ESP_ERR_TCP_TRANSPORT_CONNECTION_FAILED` (0xe003): Failed to connect to the peer

`ESP_ERR_TCP_TRANSPORT_NO_MEM` (0xe004): Memory allocation failed

`ESP_ERR_NVS_SEC_BASE` (0xf000): Starting number of error codes

`ESP_ERR_NVS_SEC_HMAC_KEY_NOT_FOUND` (0xf001): HMAC Key required to generate the NVS encryption keys not found

`ESP_ERR_NVS_SEC_HMAC_KEY_BLK_ALREADY_USED` (0xf002): Provided eFuse block for HMAC key generation is already in use

`ESP_ERR_NVS_SEC_HMAC_KEY_GENERATION_FAILED` (0xf003): Failed to generate/write the HMAC key to eFuse

`ESP_ERR_NVS_SEC_HMAC_XTS_KEYS_DERIV_FAILED` (0xf004): Failed to derive the NVS encryption keys based on the HMAC-based scheme

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