Hawkynt

ParallelHash256

ParallelHash256 is a parallel hash function from NIST SP 800-185 that supports efficient hashing of very long strings using parallelism. Based on cSHAKE256.

Properties

Property	Value
Category	Hash Functions
Sub-category	Parallel Hash Function
Security status	🛡️ Secure
Complexity	Advanced
Inventor	NIST
Year	2016
Origin	🇺🇸 United States
Source	algorithms/hash/parallelhash.js

Parameters

Parameter	Supported values
Output sizes	1 byte (8 bits) to 1024 bytes (8192 bits)

Security

Status: 🛡️ Secure

No vulnerabilities are recorded for this implementation.

Documentation

• NIST SP 800-185
• NIST Examples

References

• BouncyCastle Implementation

Test vectors

4 vectors ship with this algorithm and run in the test suite. Byte values are hexadecimal.

Vector 1 — ParallelHash256: Sample #1 (B=8, S=’’, 64 bytes) - NIST

Field	Value
blockSize	8
customization	(empty)
outputSize	64
input	000102030405060710111213141516172021222324252627
expected	bc1ef124da34495e948ead207dd98422 35da432d2bbc54b4c110e64c45110553 1b7f2a3e0ce055c02805e7c2de1fb746 af97a1dd01f43b824e31b87612410429

Vector 2 — ParallelHash256: Sample #2 (B=8, S=’Parallel Data’, 64 bytes) - NIST

Field	Value
blockSize	8
customization	506172616c6c656c2044617461
outputSize	64
input	000102030405060710111213141516172021222324252627
expected	cdf15289b54f6212b4bc270528b49526 006dd9b54e2b6add1ef6900dda3963bb 33a72491f236969ca8afaea29c682d47 a393c065b38e29fae651a2091c833110

Vector 3 — ParallelHash256: Sample #3 (B=12, S=’Parallel Data’, 64 bytes) - NIST

Field	Value
blockSize	12
customization	506172616c6c656c2044617461
outputSize	64
input	000102030405060708090a0b10111213 1415161718191a1b2021222324252627 28292a2b303132333435363738393a3b 404142434445464748494a4b50515253 5455565758595a5b
expected	69d0fcb764ea055dd09334bc6021cb7e 4b61348dff375da262671cdec3effa8d 1b4568a6cce16b1cad946ddde27f6ce2 b8dee4cd1b24851ebf00eb90d43813e9

Vector 4 — ParallelHash256: XOF mode (B=12, S=’Parallel Data’, 64 bytes)

Field	Value
blockSize	12
customization	506172616c6c656c2044617461
outputSize	64
xofMode	Yes
input	000102030405060708090a0b10111213 1415161718191a1b2021222324252627 28292a2b303132333435363738393a3b 404142434445464748494a4b50515253 5455565758595a5b
expected	6b3e790b330c889a204c2fbc728d809f 19367328d852f4002dc829f73afd6bce fb7fe5b607b13a801c0be5c1170bdb79 4e339458fdb0e62a6af3d42558970249

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