An optional parameter to set the Customer-Supplied Encryption key.
Application developers can generate their own encryption keys to protect the data in GCS. This is known as a Customer-Supplied Encryption key (CSEK). If the application provides a CSEK, GCS does not retain the key. The object data, the object CRC32 checksum, and its MD5 hash (if applicable) are all encrypted with this key, and the key is required to read any of these elements back.
Care must be taken to save and protect these keys, if lost, the data is not recoverable. Also, applications should avoid generating predictable keys, as this weakens the encryption.
This option is used in read (download), write (upload), copy, and compose operations. Note that copy and compose operations use the same key for the source and destination objects.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-04-02 UTC."],[[["This document provides a detailed reference for the `EncryptionKey` structure within the Google Cloud Storage C++ library, covering versions from 2.11.0 up to the latest release candidate 2.37.0-rc."],["Customer-Supplied Encryption Keys (CSEK) allow application developers to encrypt their data within Google Cloud Storage, where the key is not retained by Google Cloud Storage."],["The `EncryptionKey` structure supports generating keys either from a raw binary format (32 bytes) or from a base64-encoded format, also with a decoded length of 32 bytes."],["The document references GCS documentation that contains a more detailed description on how CSEK is implemented and used within their systems."],["The document contains descriptions of static functions that can be called on the encryption key, such as `FromBinaryKey`, `FromBase64Key`, and `prefix`."]]],[]]
