XXH64

XXH64 is a fast, non-cryptographic hash function developed by Yann Collet. It is designed to provide high performance, especially for 64-bit architectures, while offering good distribution and low collision rates for general-purpose hashing needs. The algorithm is known for its simplicity and speed, making it suitable for applications where quick hashing is essential, such as hash tables, data integrity checks, and duplicate detection.

The XXH64 algorithm produces a 64-bit hash value. Its design emphasizes a balance between speed and quality of hash distribution. It employs a series of bitwise operations, multiplications, and rotations to mix the input data effectively. The function is highly parallelizable, meaning it can process chunks of data concurrently to further enhance performance on multi-core processors.

XXH64 is part of the XxHash family of hash functions, which also includes XXH32 and XXH3, all designed by Yann Collet. It is often chosen over other non-cryptographic hashes like MurmurHash or CityHash when extreme speed is a primary concern, especially on modern 64-bit systems. Its implementation is typically straightforward, contributing to its widespread adoption in various software projects and libraries. It is not intended for cryptographic security purposes, as it is not resistant to malicious attacks designed to find collisions.