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Use primitive generator 3 for AES Cauchy mode

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Andrea Mazzoleni 2026-08-19 01:36:18 +02:00
parent f855bf4d82
commit b5d507fbe9
21 changed files with 7444 additions and 5791 deletions
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raid/README
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@ -88,9 +88,9 @@ Operating Modes and Polynomials
RAID_MODE_CAUCHY_RAID (Default mode = 0)
Uses Cauchy matrix generator with standard RAID polynomial 0x1d
(x^8 + x^4 + x^3 + x^2 + 1, decimal 285). Supports parities 1 to 6.
Matches standard Linux RAID-6 (Anvin method) for 2-parity arrays and
ensures on-disk compatibility.
(x^8 + x^4 + x^3 + x^2 + 1, decimal 285, 0x11d) and primitive generator
g = 2. Supports parities 1 to 6. Matches standard Linux RAID-6 (Anvin
method) for 2-parity arrays and ensures on-disk compatibility.
RAID_MODE_VANDERMONDE_RAID (Mode = 1)
Legacy mode supporting up to 3 parities using standard polynomial 0x1d.
@ -98,10 +98,13 @@ Operating Modes and Polynomials
(Z parity). Optimized for low-end CPUs without vector instructions.
RAID_MODE_CAUCHY_AES (Mode = 2)
Uses Cauchy matrix with AES polynomial 0x1b (x^8 + x^4 + x^3 + x + 1).
Enables hardware acceleration via Intel GFNI instructions (vgf2p8mulb)
on supported CPUs (Ice Lake or newer). Parity data is incompatible with
standard 0x1d polynomial arrays.
Uses Cauchy matrix with AES polynomial 0x1b (x^8 + x^4 + x^3 + x + 1,
0x11b) and primitive generator g = 3. Enables hardware acceleration via
Intel GFNI instructions (vgf2p8mulb) on supported CPUs (Ice Lake or newer).
Parity data is incompatible with standard 0x1d polynomial arrays.
Both Cauchy modes use the same Extended Cauchy construction with coefficients
based on powers of their respective primitive generator.
Implementation Structure