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SIMD ISAReturn TypeNameArgumentsInstruction Group
Neonuint32x4_tvsm4ekeyq_u32(uint32x4_t a, uint32x4_t b)Cryptography / SM4
Description
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.
Results
Vd.4S result
This intrinsic compiles to the following instructions:

SM4EKEY Vd.4S,Vn.4S,Vm.4S

Argument Preparation
a register: Vn.4Sb
Architectures
A64

Operation

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];

    intval = roundresult<127:96> EOR roundresult<95:64> EOR roundresult<63:32> EOR const; 

    for i = 0 to 3  
        Elem[intval,i,8] = Sbox(Elem[intval,i,8]); 

    intval = intval EOR ROL(intval,13) EOR ROL(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;