SM4 encode
This instruction takes input data as a 128-bit vector from the first source SIMD&FP register, and four iterations of the round key held as the elements of the 128-bit vector in the second source SIMD&FP register. It encrypts the data by four rounds, in accordance with the SM4 standard, returning the 128-bit result to the destination SIMD&FP register.
| 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 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 1 | Rn | Rd | ||||||||
| opcode | |||||||||||||||||||||||||||||||
if !IsFeatureImplemented(FEAT_SM4) then EndOfDecode(Decode_UNDEF); end; let d : integer{} = UInt(Rd); let n : integer{} = UInt(Rn);
| <Vd> |
Is the name of the SIMD&FP source and destination register, encoded in the "Rd" field. |
| <Vn> |
Is the name of the second SIMD&FP source register, encoded in the "Rn" field. |
AArch64_CheckFPAdvSIMDEnabled(); let Vn : bits(128) = V{}(n); var intval : bits(32); var roundresult : bits(128); var roundkey : bits(32); roundresult = V{128}(d); for index = 0 to 3 do roundkey = Vn[index*:32]; intval = roundresult[127:96] XOR roundresult[95:64] XOR roundresult[63:32] XOR roundkey; for i = 0 to 3 do intval[i*:8] = Sbox(intval[i*:8]); end; intval = intval XOR ROL(intval, 2) XOR ROL(intval, 10) XOR ROL(intval, 18) XOR ROL(intval, 24); intval = intval XOR 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; end; V{128}(d) = roundresult;
This instruction is a data-independent-time instruction as described in About PSTATE.DIT.
2026-03_rel 2026-03-26 20:48:11
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