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 2025-04-22 UTC."],[[["This document details 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."],["The `EncryptionKey` structure allows application developers to utilize Customer-Supplied Encryption Keys (CSEK) for enhanced data protection in Google Cloud Storage."],["The library provides two static functions, `FromBinaryKey` and `FromBase64Key`, to create encryption keys from binary or base64-encoded formats, requiring a 32-byte key."],["CSEK is used for read, write, copy, and compose operations, and the same key must be applied for both the source and destination objects during copy and compose actions."],["It is critical for users to securely store their CSEK keys because loss of these keys results in irrecoverable data, as Google Cloud Storage does not retain them."]]],[]]
