RISC-V ISA Explorer · Cryptography (Zk*)
Zbkx: Crypto Bitmanip (crossbar)
Ratified 2022-02 · version 1.0.1
Crossbar permutations that build 4- and 8-bit lookup tables in registers for constant-time S-boxes.
Typical use: Bit/byte crossbar operations
Open Zbkx in the explorerDependencies
Required by
Instructions (2)
| Mnemonic | Name | Encoding | Match | Mask |
|---|---|---|---|---|
XPERM4 | Crossbar permutation (nibbles) | 0010100----------010-----0110011 | 0x28002033 | 0xfe00707f |
XPERM8 | Crossbar permutation (bytes) | 0010100----------100-----0110011 | 0x28004033 | 0xfe00707f |