- Blob field with compression data is not valid generator#
- Blob field with compression data is not valid verification#
- Blob field with compression data is not valid code#
Blob field with compression data is not valid generator#
Pseudo-random number generator as a random nonce. For encrypting newĭata first 16 bytes are read from a cryptographically secure The number of packs described in a singleįile is chosen so that the file size is kept below 8 MiB.Īll data stored by restic in the repository is encrypted with AES-256 inĬounter mode and authenticated using Poly1305-AES. There may be an arbitrary number of index files, containing information This happens when index filesĪre repacked, for example when old snapshots are removed and Packs are The field supersedes lists the storage IDs of index files that haveīeen replaced with the current index file. The length fieldĬorresponds to Length(encrypted_blob) in the pack file header.įield uncompressed_length is only present for compressed blobs and In thisĮxample, the Pack 73d04e61 contains two data Blobs and one Treeīlob, the plaintext hashes are listed afterwards. This JSON document lists Packs and the blobs contained therein. Plaintext hashes, types, offsets and lengths of all included blobs. Afterwards, the header can be read and parsed, which yields all The last four bytes must be read in order to find the length of the In version 2, they must be stored in separate files.Ĭompressed and non-compress blobs of the same type may be mixed in a packįor reconstructing the index or parsing a pack without an index, first In repository format version 1, data and tree blobs should be stored in Tree blobs may be compressed with the zstandard compression algorithm. TheĬompressed types are only valid for repository format version 2. Of the decrypted and uncompressed data a blob consists of.Īll other types are invalid, more types may be added in the future. In the Data column, Length(plaintext_blob) means the length The length fields are encoded as four byte integers in little-endianįormat. This is enough to calculate the offsets for all the Blobs in the Pack. Length(encrypted_blob) || Length(plaintext_blob) || Hash(plaintext_blob) Length(encrypted_blob) || Hash(plaintext_blob) Type_Blob1 || Data_Blob1 || Type_BlobN || Data_BlobN || Without having to read the complete Pack.Īfter decryption, a Pack’s header consists of the following elements: Header is authenticated, authenticity of the header can be checked In order to find out which Blobs are contained in the Pack. It also allows efficient indexing, for only the header needs to be read Reorganisation without having to touch the encrypted Blobs. Re-write a file once the pack is complete and the content and length ofĪll the blobs ( EncryptedBlob1, EncryptedBlobN etc.) areĪuthenticated and encrypted independently.
Blob field with compression data is not valid code#
This reduces code complexity and avoids having to Writing the blobs in a continuous stream as soon as they are read during Placing the header at the end of a file allows Length of the encrypted header encoded as a four byte integer in The header is encrypted and authenticated.
|| EncryptedBlobN || EncryptedHeader || Header_LengthĪt the end of the Pack file is a header, which describes the content. The file config is encrypted this way and contains a JSON documentĮncryptedBlob1 ||. TheĬomplete encryption overhead is 32 bytes. It is followed by the encrypted data and completed by In the first 16 bytes of each encrypted file the initialisation vector (sometimes also referred to as a “signature”). The integrity of theĮncrypted data is secured by a Poly1305-AES message authentication code Unique amongst all the other files in the same directory, the prefix mayīe used instead of the complete filename.Īpart from the files stored within the keys directory, all files areĮncrypted with AES-256 in counter mode (CTR).
Blob field with compression data is not valid verification#
Verification of files for accidental modifications, like disk readĮrrors, by simply running the program sha256sum on the file andĬomparing its output to the file name. Which is the SHA-256 hash of the file’s contents. The file is the lower case hexadecimal representation of the storage ID, For all other files stored in the repository, the name for Repositories consist of several directories and a top-level file calledĬonfig. Operation removes data from the repository. Writing to the repository with multiple clients in parallel. Operations from reading incomplete files. Writing should occur atomically to prevent concurrent All files in a repository are only written once and never This so-called “storage ID” is the SHA-256 hash of the content ofĪ file. A repository is able to storeĭata of several different types, which can later be requested based onĪn ID. All data is stored in a restic repository.
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