JH (hash function)

JH
General
Designers	Hongjun Wu
Certification	SHA-3 finalist
Detail
Digest sizes	224, 256, 384, 512
Speed	16.1 cpb on Core 2 in 64-bit mode using SSE2; 37.3 cpb using ANSI C.

JH is a cryptographic hash function submitted to the NIST hash function competition by Hongjun Wu. Though chosen as one of the five finalists of the competition, JH ultimately lost to NIST hash candidate Keccak.^[1] JH has a 1024-bit state, and works on 512-bit input blocks. Processing an input block consists of three steps:

XOR the input block into the left half of the state.
Apply a 42-round unkeyed permutation (encryption function) to the state. This consists of 42 repetitions of:
1. Break the input into 256 4-bit blocks, and map each through one of two 4-bit S-boxes, the choice being made by a 256-bit round-dependent key schedule. Equivalently, combine each input block with a key bit, and map the result through a 5→4 bit S-box.
2. Mix adjacent 4-bit blocks using a maximum distance separable code over GF(2⁴).
3. Permute 4-bit blocks so that they will be adjacent to different blocks in following rounds.
XOR the input block into the right half of the state.

The resulting digest is the first 224, 256, 384 or 512 bits from the 1024-bit final value. It is well suited to a bit slicing implementation using the SSE2 instruction set, giving speeds of 16.8 Cycles per byte.

References

↑ "NIST Selects Winner of Secure Hash Algorithm (SHA-3) Competition" (Press release). NIST. 2012-10-02. Retrieved 2012-10-02.

External links

Cryptographic hash functions & message authentication codes

List Comparison Known attacks

Common functions	MD5 SHA-1 SHA-2 SHA-3 BLAKE2

SHA-3 finalists	BLAKE Grøstl JH Skein Keccak (winner)

Other functions	ECOH FSB GOST HAS-160 HAVAL Kupyna LM hash MD2 MD4 MD5 MD6 MDC-2 N-Hash RIPEMD RadioGatún SWIFFT SipHash Snefru Streebog Tiger VSH WHIRLPOOL

Key derivation functions	bcrypt crypt PBKDF2 scrypt Argon2 Lyra2

MAC functions	DAA CBC-MAC HMAC OMAC/CMAC PMAC VMAC UMAC Poly1305

Authenticated encryption modes	CCM CWC EAX GCM IAPM OCB

Attacks	Collision attack Preimage attack Birthday attack Brute force attack Rainbow table Side-channel attack Length extension attack

Design	Avalanche effect Hash collision Merkle–Damgård construction

Standardization	CRYPTREC NESSIE NIST hash function competition

Utilization	Hash-based cryptography Key stretching Merkle tree Message authentication Proof of work Salt

Cryptography

History of cryptography Cryptanalysis Outline of cryptography

Symmetric-key algorithm Block cipher Stream cipher Public-key cryptography Cryptographic hash function Message authentication code Random numbers Steganography

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