XXH32 Hash Tool
Other Hash Generator
MD2 MD4 MD5 SHA1 SHA224 SHA256 SHA384 SHA512/224 SHA512/256 SHA512 SHA3-224 SHA3-256 SHA3-384 SHA3-512 RIPEMD128 RIPEMD160 RIPEMD256 RIPEMD320 WHIRLPOOL TIGER128,3 TIGER160,3 TIGER192,3 TIGER128,4 TIGER160,4 TIGER192,4 SNEFRU SNEFRU256 GOST GOST-CRYPTO ADLER32 CRC32 CRC32B CRC32C FNV132 FNV1A32 FNV164 FNV1A64 JOAAT MURMUR3A MURMUR3C MURMUR3F XXH32 XXH64 XXH3 XXH128 HAVAL128,3 HAVAL160,3 HAVAL192,3 HAVAL224,3 HAVAL256,3 HAVAL128,4 HAVAL160,4 HAVAL192,4 HAVAL224,4 HAVAL256,4 HAVAL128,5 HAVAL160,5 HAVAL192,5 HAVAL224,5 HAVAL256,5Initialization
The algorithm begins with the initialization of an internal state using a predefined seed value. Four 32-bit accumulators are set based on this seed, ensuring that different seeds produce distinct hash results. This initialization is crucial for the uniform distribution of output values and reduces collision probability for small variations in input data.
Processing Input Data
XXH32 processes the input in blocks of 16 bytes. Each block is divided into four 32-bit segments, which are mixed with the internal state using a combination of multiplication with prime constants, addition, and bitwise rotation. This mixing ensures that all input bytes contribute to the final hash value and provides a fast avalanche effect, spreading small input changes across the output.
Handling Remaining Bytes
If the input length is not a multiple of 16, the remaining 1 to 15 bytes are processed individually or in smaller groups. These remaining bytes are combined with the internal state using the same multiplication and rotation operations, maintaining uniformity and ensuring the final hash incorporates every byte of input.
Finalization
After all input bytes are processed, the internal state is folded into a single 32-bit value. Additional mixing operations, including bitwise shifts, multiplications with prime constants, and XOR operations, are applied to finalize the hash. This step ensures that the output hash exhibits low correlation with similar inputs, even for small differences in the input data.
Performance Characteristics
XXH32 is optimized for 32-bit platforms but also performs efficiently on 64-bit architectures. It achieves high throughput due to its simple arithmetic operations and minimal branching. The algorithm provides consistent speed regardless of input size and exhibits strong distribution properties, making it suitable for high-performance applications where rapid hash computation is required.
Applications
The algorithm is widely used for checksums, data deduplication, hash tables, and other scenarios where speed is more important than cryptographic security. Its lightweight design allows integration in memory-constrained environments, and its deterministic output ensures repeatable hash results for identical inputs.