Design Features
Whirlpool is a hash designed after the Square block cipher. Whirlpool is a Miyaguchi-Preneel construction based on a substantially modified Advanced Encryption Standard (AES). It takes a message of any length less than 2256 bits and 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."
Read more about this topic: Whirlpool (cryptography)
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