WHIRLPOOL is a cryptographic hash function designed by Vincent Rijmen and Paulo S. L. M. Barreto . The hash has been recommended by the NESSIE project.

WHIRLPOOL is a hash designed after the Square block cipher. Whirlpool is a Miyaguchi-Preneel construction based on a substantially modified Advanced Encryption Standard. Given a message less than 2²⁵⁶ bits in length, it returns a 512-bit message digest.

The authors have declared that "WHIRLPOOL is not (and will never be) patented. It may be used free of charge for any purpose. The reference implementations are in the public domain."

The algorithm is named after the Whirlpool Galaxy in Canes Venatici.

WHIRLPOOL hashes

The 512-bit (32-byte) WHIRLPOOL hashes (also termed message digests) are typically represented as 128-digit hexadecimal numbers. The following demonstrates a 43-byte ASCII input and the corresponding WHIRLPOOL hash:

WHIRLPOOL("The quick brown fox jumps over the lazy dog") =

B97DE512E91E3828B40D2B0FDCE9CEB3C4A71F9BEA8D88E75C4FA854DF36725F

D2B52EB6544EDCACD6F8BEDDFEA403CB55AE31F03AD62A5EF54E42EE82C3FB35

Even a small change in the message will (with overwhelming probability) result in a completely different hash, e.g. changing d to c:

WHIRLPOOL("The quick brown fox jumps over the lazy cog") =

DCE81FC695CFEA3D7E1446509238DAF89F24CC61896F2D265927DAA70F2108F8

902F0DFD68BE085D5ABB9FCD2E482C1DC24F2FABF81F40B73495CAD44D7360D3

The hash of a zero-length string is:

WHIRLPOOL("") =

19FA61D75522A4669B44E39C1D2E1726C530232130D407F89AFEE0964997F7A7

3E83BE698B288FEBCF88E3E03C4F0757EA8964E59B63D93708B138CC42A66EB3

See also

• RIPEMD-160
• SHA-1
• Hashcash
• Digital timestamping

External links

• More information on WHIRLPOOL