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 2025-04-02 UTC."],[[["The latest version available is 2.37.0-rc, with numerous previous versions of the storage reference documented, including 2.36.0 down to 2.11.0."],["This documentation covers the `SourceEncryptionKey` structure within the Google Cloud Storage C++ library."],["`SourceEncryptionKey` is an optional parameter that sets the Customer-Supplied Encryption Key (CSEK) for rewrite source objects within GCS, where it does not retain the key."],["There are two methods to create a `SourceEncryptionKey`: `FromBinaryKey`, which takes a 32-byte binary key, and `FromBase64Key`, which takes a base64-encoded key that decodes to 32 bytes."],["It is crucial to securely store CSEKs, as lost keys result in data loss, and predictable keys should be avoided to ensure the efficacy of encryption."]]],[]]
