HAVAL256,4 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 HAVAL256,5Input Processing
The algorithm accepts input data of arbitrary length. Initially, the input is padded to ensure its total length is a multiple of 1024 bits. Padding consists of appending a single '1' bit, followed by a series of '0' bits, and finally appending a 128-bit representation of the original message length. This padding guarantees that the message can be divided into 1024-bit blocks for processing.
Initialization
HAVAL-256,4 uses eight 32-bit registers to maintain intermediate values. These registers are initialized with predefined constants that are specific to the algorithm. These constants serve as the starting state for the hash computation and ensure consistent outputs for identical inputs.
Main Computation
The algorithm processes the padded input in 1024-bit blocks through four distinct passes. Each pass consists of 32 rounds, where each round applies a non-linear function to the current state and a portion of the message block. The functions involve bitwise operations including AND, OR, XOR, and NOT, combined with modular addition. Each pass uses a different function sequence, which provides additional mixing and resistance against cryptanalytic attacks.
Message Schedule and Mixing
During each pass, the 1024-bit block is divided into 32-bit words. The algorithm schedules these words using predefined permutations, ensuring that each bit of the input influences multiple rounds. After applying the round functions, the intermediate hash values are updated by adding them modulo 232 to the previous register states. This cumulative addition guarantees that changes in any input bit propagate through the final hash output.
Finalization
After processing all blocks, HAVAL-256,4 performs a final mixing of the eight registers to generate the 256-bit hash output. The final hash is the concatenation of the register values in a specific order defined by the algorithm. This output is highly sensitive to any modification in the input, producing distinct hash values even for minor changes, which makes it suitable for integrity verification and cryptographic applications.