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SM4 Key takes an input as a 128-bit vector from the first source SIMD&FP register and a 128-bit constant from the second SIMD&FP register. It derives four iterations of the output key, in accordance with the SM4 standard, returning the 128-bit result to the destination SIMD&FP register.
This instruction is implemented only when ARMv8.2-SM is implemented.
31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
1 | 1 | 0 | 0 | 1 | 1 | 1 | 0 | 0 | 1 | 1 | Rm | 1 | 1 | 0 | 0 | 1 | 0 | Rn | Rd |
if !HaveSM4Ext() then UNDEFINED; integer d = UInt(Rd); integer n = UInt(Rn); integer m = UInt(Rm);
<Vd> | Is the name of the SIMD&FP destination register, encoded in the "Rd" field. |
<Vn> | Is the name of the first SIMD&FP source register, encoded in the "Rn" field. |
<Vm> | Is the name of the second SIMD&FP source register, encoded in the "Rm" field. |
AArch64.CheckFPAdvSIMDEnabled();
bits(128) Vm = V[m];
bits(32) intval;
bits(8) sboxout;
bits(128) result;
bits(32) const;
bits(128) roundresult;
roundresult = V[n];
for index = 0 to 3
const = Elem[Vm, index, 32];
[Vm,index,32];
intval = roundresult<127:96> EOR roundresult<95:64> EOR roundresult<63:32> EOR const;
intval = roundresult<127:96> EOR roundresult<95:64> EOR roundresult<63:32> EOR const;
for i = 0 to 3
Elem[intval, i, 8] =[intval,i,8] = Sbox(Elem[intval, i, 8]);
[intval,i,8]);
intval = intval EOR ROL(intval, 13) EOR(intval,13) EOR ROL(intval, 23);
intval = intval EOR roundresult<31:0>;
(intval,23);
intval = intval EOR roundresult<31:0>;
roundresult<31:0> = roundresult<63:32>;
roundresult<63:32> = roundresult<95:64>;
roundresult<95:64> = roundresult<127:96>;
roundresult<127:96> = intval;
V[d] = roundresult;
If PSTATE.DIT is 1:
Internal version only: isa v30.44, AdvSIMD v27.08, pseudocode v8.5-2019-06_rc2-5-g22901f2, sve v2019-06_rc4
; Build timestamp: 2019-06-26T22:3004
Copyright © 2010-2019 Arm Limited or its affiliates. All rights reserved. This document is Non-Confidential.
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