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 2025-04-22 UTC."],[[["This page details the `SourceEncryptionKey` structure for Google Cloud Storage (GCS) in C++, which is used to manage Customer-Supplied Encryption Keys (CSEK) for object rewrite operations."],["The page provides links to the documentation for various versions of the C++ library, ranging from version 2.11.0 up to the latest release candidate version 2.37.0-rc."],["Customer-Supplied Encryption Keys allow users to encrypt data in GCS with their own keys, enhancing data security, but users are responsible for managing and protecting these keys."],["The `SourceEncryptionKey` struct offers static functions, `FromBinaryKey` and `FromBase64Key`, to create encryption key parameters from either binary or base64-encoded keys."],["The `prefix()` function is also present, though its functionality isn't explicitly detailed, and is likely a component of how it is used in the SDK."]]],[]]
