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 2025-04-01 UTC."],[[["The webpage provides documentation for the `SourceEncryptionKey` structure in the Google Cloud Storage C++ client library, spanning multiple versions from 2.11.0 to 2.37.0-rc (latest)."],["`SourceEncryptionKey` is an optional parameter used in rewrite operations to specify the Customer-Supplied Encryption Key (CSEK) for the source object in Google Cloud Storage."],["CSEK allows developers to protect their data in Google Cloud Storage by using their own encryption keys, which are not retained by Google Cloud Storage and must be securely stored by the application."],["The documentation details how to create a `SourceEncryptionKey` from a binary key using `FromBinaryKey()` and from a base64-encoded key using `FromBase64Key()`, with each key required to be exactly 32 bytes."],["The page provides a link to Google's documentation for further insight on Customer Supplied Encryption keys."]]],[]]
