An optional parameter to set the Customer-Supplied Encryption key for rewrite source object.
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 only in rewrite operations and it defines the key used for the source object.
[[["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 2025-03-21 UTC."],[[["This page provides documentation for the `SourceEncryptionKey` structure within the Google Cloud Storage C++ client library, covering versions from 2.11.0 up to the latest release candidate 2.37.0-rc."],["`SourceEncryptionKey` is an optional parameter used in rewrite operations to specify the Customer-Supplied Encryption Key (CSEK) for the source object."],["The Customer-Supplied Encryption Key (CSEK) is used to encrypt data, its CRC32 checksum, and its MD5 hash, if present, within Google Cloud Storage, and losing the key will result in data inaccessibility."],["The `SourceEncryptionKey` structure offers two static functions for creating a source encryption key: `FromBinaryKey`, which takes a 32-byte binary key, and `FromBase64Key`, which accepts a base64-encoded key that must decode to 32 bytes."],["The static `prefix()` function is available in this structure, though it's function remains not described."]]],[]]
