Supported checksums

Reviewed on 14 November 2024 • Published on 14 November 2024

Checksums are critical components in ensuring data integrity within object storage systems. They are calculated values, typically a hash or a cyclic redundancy check (CRC), obtained from the content of an object. By comparing the stored checksum with one recalculated during data retrieval, storage systems can detect and often correct errors caused by corruption, transmission issues, or hardware failures.

Scaleway Object Storage supports several checksum algorithms that allow you to verify the integrity of your objects:

CRC32: a non-cryptographic checksum that generates a 32-bit hash value used to detect errors in data transmission by applying a specific cyclic redundancy check (CRC) algorithm.
CRC32C: a checksum algorithm that uses the Castagnoli polynomial for improved error-detection performance over the standard CRC32.
SHA-1: a cryptographic Secure Hash Algorithm (SHA) that generates a 160-bit (20-byte) hash value from input data.
SHA-256: a cryptographic Secure Hash Algorithm that generates a 256-bit unique hash value, preferred for modern security protocols due to SHA-1 vulnerabilities.