TITLE:
Parallelized Hashing via j-Lanes and j-Pointers Tree Modes, with Applications to SHA-256
AUTHORS:
Shay Gueron
KEYWORDS:
Tree Mode Hashing, SHA-256, SIMD Architecture, Advanced Vector Extensions Architectures, AVX, AVX2
JOURNAL NAME:
Journal of Information Security,
Vol.5 No.3,
July
17,
2014
ABSTRACT: j-lanes tree hashing is a tree mode
that splits an input message intojslices, computesjindependent digests of each slice, and
outputs the hash value of their concatenation.j-pointers tree hashing is a
similar tree mode that receives, as input,jpointers tojmessages (or slices of a single message),
computes their digests and outputs the hash value of their concatenation. Such
modes expose parallelization opportunities in a hashing process that is
otherwise serial by nature. As a result, they have a performance advantage on
modern processor architectures. This paper provides precise specifications for
these hashing modes, proposes appropriate IVs, and demonstrates their
performance on the latest processors. Our hope is that it would be useful for standardization
of these modes.