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 webpage details the `SourceEncryptionKey` structure for Google Cloud Storage (GCS) in C++, specifically for managing Customer-Supplied Encryption Keys (CSEK)."],["The page provides documentation for multiple versions of the library, ranging from version 2.11.0 up to the latest release candidate 2.37.0-rc."],["`SourceEncryptionKey` is an optional parameter used in rewrite operations to define the encryption key of the source object."],["The `SourceEncryptionKey` class provides static methods `FromBinaryKey` and `FromBase64Key` to create a source encryption key from either a binary or a base64-encoded key, both of which must be exactly 32 bytes in length when decoded."],["It is crucial for developers to safeguard their CSEKs, as data is unrecoverable if these keys are lost, and avoiding the use of predictable keys is essential to maintain strong encryption."]]],[]]
