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Updated Armv8.2 SM3和SM4 (markdown)

Sun Yimin 2022-02-16 16:03:09 +08:00
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Armv8.2-SM3和SM4.md

@ -41,6 +41,68 @@ AESE指令相当于：
ok github.com/emmansun/gmsm/sm4 5.334s
```
## SM4 with SM4E & SM4EKEY
[SM4EKEY](https://developer.arm.com/documentation/ddi0596/2021-12/SIMD-FP-Instructions/SM4EKEY--SM4-Key-?lang=en)
[SM4E](https://developer.arm.com/documentation/ddi0596/2021-12/SIMD-FP-Instructions/SM4E--SM4-Encode-?lang=en)
目前golang还没有支持SM4E/SM4EKEY指令，不过我们可以根据[不支持的操作码](https://go.dev/doc/asm#unsupported_opcodes)来处理：
1. Clone codes from https://github.com/golang/arch
2. 修改arm64asm/tables.go: 增加SM4E/SM4EKEY常量；同时加入opstr；加入指令到instFormats。
![image](https://user-images.githubusercontent.com/7235232/154217159-6111ed63-41e8-42df-8aef-c8fb144e68c4.png)
```
// SM4E <Vd>.4S, <Vn>.4S
{0xfffffc00, 0xcec08400, SM4E, instArgs{arg_Vd_arrangement_4S, arg_Vn_arrangement_4S}, nil},
// SM4EKEY <Vd>.4S, <Vn>.4S, <Vm>.4S
{0xffe0fc00, 0xce60c800, SM4EKEY, instArgs{arg_Vd_arrangement_4S, arg_Vn_arrangement_4S, arg_Vm_arrangement_4S}, nil},
```
2. 修改arm64asm/plan9x.go，noSuffixOpSet里加上SM4E和SM4EKEY，这个是可选的，加了的话，plan9x的指令就不会出现V前缀。
3. 写测试，testDecodeLine()方法是从decode_test.go的testDecode()方法中抽出来的。看了那个Decode()方法就能编码出那些32位的code了。
```
func TestDecodeSM4Codes(t *testing.T) {
//gnu syntax, load 16 bytes plaintext to v8 (need to reverse byte order first), 32 round keys to v0-v7, the final result should be reverse byte order again
testDecodeLine(t, "gnu", "0884c0ce| sm4e v8.4s, v0.4s")
testDecodeLine(t, "gnu", "2884c0ce| sm4e v8.4s, v1.4s")
testDecodeLine(t, "gnu", "4884c0ce| sm4e v8.4s, v2.4s")
testDecodeLine(t, "gnu", "6884c0ce| sm4e v8.4s, v3.4s")
testDecodeLine(t, "gnu", "8884c0ce| sm4e v8.4s, v4.4s")
testDecodeLine(t, "gnu", "a884c0ce| sm4e v8.4s, v5.4s")
testDecodeLine(t, "gnu", "c884c0ce| sm4e v8.4s, v6.4s")
testDecodeLine(t, "gnu", "e884c0ce| sm4e v8.4s, v7.4s")
//plan9 syntax, load 16 bytes plaintext to v8 (need to reverse byte order first), 32 round keys to v0-v7, the final result should be reverse byte order again
testDecodeLine(t, "plan9", "0884c0ce| SM4E V0.S4, V8.S4")
testDecodeLine(t, "plan9", "2884c0ce| SM4E V1.S4, V8.S4")
testDecodeLine(t, "plan9", "4884c0ce| SM4E V2.S4, V8.S4")
testDecodeLine(t, "plan9", "6884c0ce| SM4E V3.S4, V8.S4")
testDecodeLine(t, "plan9", "8884c0ce| SM4E V4.S4, V8.S4")
testDecodeLine(t, "plan9", "a884c0ce| SM4E V5.S4, V8.S4")
testDecodeLine(t, "plan9", "c884c0ce| SM4E V6.S4, V8.S4")
testDecodeLine(t, "plan9", "e884c0ce| SM4E V7.S4, V8.S4")
//gnu syntax, load 32 ck to v0-v7, root key (reverse byte order first) xor fk to v8, the result round keys will be in v9, need to move v9 to v8 from second invocation of sm4ekey
testDecodeLine(t, "gnu", "09c960ce| sm4ekey v9.4s, v8.4s, v0.4s")
testDecodeLine(t, "gnu", "09c961ce| sm4ekey v9.4s, v8.4s, v1.4s")
testDecodeLine(t, "gnu", "09c962ce| sm4ekey v9.4s, v8.4s, v2.4s")
testDecodeLine(t, "gnu", "09c963ce| sm4ekey v9.4s, v8.4s, v3.4s")
testDecodeLine(t, "gnu", "09c964ce| sm4ekey v9.4s, v8.4s, v4.4s")
testDecodeLine(t, "gnu", "09c965ce| sm4ekey v9.4s, v8.4s, v5.4s")
testDecodeLine(t, "gnu", "09c966ce| sm4ekey v9.4s, v8.4s, v6.4s")
testDecodeLine(t, "gnu", "09c967ce| sm4ekey v9.4s, v8.4s, v7.4s")
//gnu syntax, load 32 ck to v0-v7, root key (reverse byte order first) xor fk to v8, the result round keys will be in v9 （1，3，5，7） and v8 （2，4，6，8），避免寄存器copy。
testDecodeLine(t, "gnu", "09c960ce| sm4ekey v9.4s, v8.4s, v0.4s")
testDecodeLine(t, "gnu", "28c961ce| sm4ekey v8.4s, v9.4s, v1.4s")
testDecodeLine(t, "gnu", "09c962ce| sm4ekey v9.4s, v8.4s, v2.4s")
testDecodeLine(t, "gnu", "28c963ce| sm4ekey v8.4s, v9.4s, v3.4s")
testDecodeLine(t, "gnu", "09c964ce| sm4ekey v9.4s, v8.4s, v4.4s")
testDecodeLine(t, "gnu", "28c965ce| sm4ekey v8.4s, v9.4s, v5.4s")
testDecodeLine(t, "gnu", "09c966ce| sm4ekey v9.4s, v8.4s, v6.4s")
testDecodeLine(t, "gnu", "28c967ce| sm4ekey v8.4s, v9.4s, v7.4s")
}
```
4.然后，你就可以在golang的arm64的汇编中使用那些32位的codes了。
```
WORD $0x0884c0ce // SM4E V0.S4, V8.S4
```
可惜没有环境！！！
## Reference
SM3和SM4 CPU指令实现，找不到相关CPU环境，mark先。
1. [Summary of A64 cryptographic instructions](https://developer.arm.com/documentation/100076/0100/a64-instruction-set-reference/a64-cryptographic-algorithms/a64-cryptographic-instructions?lang=en)