Documentation/security/siphash.rst

2 SipHash - a short input PRF
7 SipHash is a cryptographically secure PRF -- a keyed hash function -- that
13 SipHash takes a secret key filled with randomly generated numbers and either
74 SipHash has a very high security margin, with its 128-bit key. So long as the
79 Linux implements the "2-4" variant of SipHash.
106 Read the SipHash paper if you're interested in learning more:
112 HalfSipHash - SipHash's insecure younger cousin
117 On the off-chance that SipHash is not fast enough for your needs, you might be
119 possibility. HalfSipHash cuts SipHash's rounds down from "2-4" to "1-3" and,
121 instead of SipHash's 128-bit key. However, this may appeal to some
133 On 64-bit kernels, the hsiphash functions actually implement SipHash-1-3, a
134 reduced-round variant of SipHash, instead of HalfSipHash-1-3. This is because in
135 64-bit code, SipHash-1-3 is no slower than HalfSipHash-1-3, and can be faster.