Whirlpool Hash Generator
Whirlpool Hash Generator — Free Online Tool
Generate a 512-bit Whirlpool digest - the AES-derived, ISO-standardised hash from the NESSIE project. Enter your text below and press Whirlpool.
Whirlpool Hash Generator
Generate a 512-bit Whirlpool digest - the AES-derived, ISO-standardised hash from the NESSIE project.
What Whirlpool Is
Whirlpool produces a 512-bit digest from a design built on a modified AES block cipher in Miyaguchi-Preneel mode. It was designed by Paulo Barreto and Vincent Rijmen - Rijmen being a co-author of Rijndael, which became AES - and is one of the few widely reviewed hash functions that is not part of the SHA lineage.
| Algorithm | Whirlpool (Miyaguchi-Preneel / AES-based family) |
|---|---|
| Digest length | 512 bits — 128 hexadecimal characters |
| Block size | 512 bits |
| Designed by | Paulo Barreto and Vincent Rijmen, 2000 |
| Specification | ISO/IEC 10118-3 |
| Status in 2026 | Secure but rarely deployed |
A worked example
Hashing the five characters hello with Whirlpool gives:
Change a single character of the input and the entire digest changes, with no resemblance to the previous one. That property is called the avalanche effect, and every cryptographic hash is designed to have it.
How Whirlpool Got Here
Whirlpool was submitted to the European NESSIE project in 2000 and selected for its portfolio. It was revised twice: Whirlpool-0 was the original, Whirlpool-T changed the S-box in 2001, and the final version changed the diffusion matrix in 2003 after a flaw was found in the hardware-efficiency argument for the previous one. It has been part of ISO/IEC 10118-3 since 2004 and is in the public domain, free of patents. TrueCrypt and its successors offer it as a key-derivation option, and it appears in FreeOTFE and some archival tools - but it never displaced SHA-2 in mainstream use.
Security Status of Whirlpool
No practical attack exists against the final version. The best published cryptanalysis is a rebound attack reaching a reduced number of rounds, far short of anything usable. Its relative obscurity is a double-edged property: less deployment means less incentive for attackers, and also less accumulated scrutiny than SHA-2 has received.
Use Whirlpool for
- Meeting an ISO/IEC 10118-3 requirement where SHA-2 is not an accepted option.
- Disk encryption key derivation, where VeraCrypt and similar tools offer it.
- Algorithm diversity - a second, structurally unrelated digest alongside SHA-2 for long-term archival integrity.
Do not use Whirlpool for
- As a drop-in where interoperability matters - many platforms and libraries do not implement it.
- Raw password hashing, for the same speed reason that rules out every general-purpose hash.
How to Use This Whirlpool Generator
- Paste or type your text into the input box above, or upload a plain-text file.
- Press the Whirlpool button.
- The digest appears in the output box, ready to copy.
The same input always produces the same output@if($algo['status'] === 'password') — except with bcrypt, where the random salt makes every result different@endif, on this page or in any correct implementation. If a digest from another tool disagrees with this one, the cause is almost always a difference in the input: a trailing newline, a different character encoding, or invisible whitespace.
Frequently Asked Questions About Whirlpool
Is Whirlpool more secure than SHA-512?
Both produce 512-bit digests and neither has a practical attack, so on current evidence they are comparable. SHA-512 has had far more cryptanalytic attention, which some consider reassuring and others consider a larger target. The honest answer is that the choice rarely matters on security grounds; it matters on support.
Why is Whirlpool not more widely used?
Timing and inertia. SHA-2 was published by NIST in 2001, was mandated by US federal standards, and shipped in every mainstream library by default. Whirlpool arrived at the same moment with no such mandate. It is technically sound and free of patents; it simply lost the adoption race.
What does the AES connection mean in practice?
Whirlpool's compression function is a block cipher very close to AES, run in Miyaguchi-Preneel mode. That means its security argument rests on a well-studied cipher design rather than on the Merkle-Damgard chaining used by MD5 and SHA-1, giving it a genuinely different structure from the SHA family.
How long is a Whirlpool hash?
512 bits, written as 128 hexadecimal characters - the same length as SHA-512.
Hashing in One Minute
A hash function takes input of any length and returns a fixed-length digest. Three properties define a cryptographic hash: the same input always yields the same digest, it is infeasible to recover the input from the digest, and it is infeasible to find two inputs that produce the same digest. Hashing is one-way and keyless, which is what separates it from encryption — there is nothing to decrypt, because nothing was encrypted.
Where hashes go wrong is almost always a mismatch between the job and the tool. A checksum for detecting a corrupted download and a password hash protecting a leaked database are different problems, and an algorithm that is excellent at one can be disqualifying at the other. For the full treatment — how the algorithms work internally, salting, HMAC, rainbow tables and the rest — see the complete guide to hash generation.
The Other Algorithms in This Tool
The generator above supports every algorithm below. Each has its own page explaining what it is for.