| // Copyright 2024 The Go Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style |
| // license that can be found in the LICENSE file. |
| |
| package main |
| |
| import ( |
| "fmt" |
| |
| . "github.com/mmcloughlin/avo/build" |
| . "github.com/mmcloughlin/avo/operand" |
| . "github.com/mmcloughlin/avo/reg" |
| ) |
| |
| // Implement the SHA-1 block function using the Intel(R) SHA extensions |
| // (SHA1RNDS4, SHA1NEXTE, SHA1MSG1, and SHA1MSG2). This implementation requires |
| // the AVX, SHA, SSE2, SSE4.1, and SSSE3 extensions. |
| // |
| // Reference: |
| // S. Gulley, et al, "New Instructions Supporting the Secure Hash |
| // Algorithm on Intel® Architecture Processors", July 2013 |
| // https://www.intel.com/content/www/us/en/developer/articles/technical/intel-sha-extensions.html |
| |
| func blockSHANI() { |
| Implement("blockSHANI") |
| |
| digest := Load(Param("dig"), RDI) |
| data := Load(Param("p").Base(), RSI) |
| len := Load(Param("p").Len(), RDX) |
| |
| abcd := XMM() |
| msg0, msg1, msg2, msg3 := XMM(), XMM(), XMM(), XMM() |
| e0, e1 := XMM(), XMM() |
| shufMask := XMM() |
| |
| CMPQ(len, Imm(0)) |
| JEQ(LabelRef("done")) |
| ADDQ(data, len) |
| |
| stackPtr := GP64() |
| { |
| Comment("Allocate space on the stack for saving ABCD and E0, and align it to 16 bytes") |
| local := AllocLocal(32 + 16) |
| LEAQ(local.Offset(15), stackPtr) |
| tmp := GP64() |
| MOVQ(U64(15), tmp) |
| NOTQ(tmp) |
| ANDQ(tmp, stackPtr) |
| } |
| e0_save := Mem{Base: stackPtr} |
| abcd_save := Mem{Base: stackPtr}.Offset(16) |
| |
| Comment("Load initial hash state") |
| PINSRD(Imm(3), Mem{Base: digest}.Offset(16), e0) |
| VMOVDQU(Mem{Base: digest}, abcd) |
| PAND(upperMask(), e0) |
| PSHUFD(Imm(0x1b), abcd, abcd) |
| |
| VMOVDQA(flipMask(), shufMask) |
| |
| Label("loop") |
| |
| Comment("Save ABCD and E working values") |
| VMOVDQA(e0, e0_save) |
| VMOVDQA(abcd, abcd_save) |
| |
| Comment("Rounds 0-3") |
| VMOVDQU(Mem{Base: data}, msg0) |
| PSHUFB(shufMask, msg0) |
| PADDD(msg0, e0) |
| VMOVDQA(abcd, e1) |
| SHA1RNDS4(Imm(0), e0, abcd) |
| |
| Comment("Rounds 4-7") |
| VMOVDQU(Mem{Base: data}.Offset(16), msg1) |
| PSHUFB(shufMask, msg1) |
| SHA1NEXTE(msg1, e1) |
| VMOVDQA(abcd, e0) |
| SHA1RNDS4(Imm(0), e1, abcd) |
| SHA1MSG1(msg1, msg0) |
| |
| Comment("Rounds 8-11") |
| VMOVDQU(Mem{Base: data}.Offset(16*2), msg2) |
| PSHUFB(shufMask, msg2) |
| SHA1NEXTE(msg2, e0) |
| VMOVDQA(abcd, e1) |
| SHA1RNDS4(Imm(0), e0, abcd) |
| SHA1MSG1(msg2, msg1) |
| PXOR(msg2, msg0) |
| |
| // Rounds 12 through 67 use the same repeated pattern, with e0 and e1 ping-ponging |
| // back and forth, and each of the msg temporaries moving up one every four rounds. |
| msgs := []VecVirtual{msg3, msg0, msg1, msg2} |
| for i := range 14 { |
| Comment(fmt.Sprintf("Rounds %d-%d", 12+(i*4), 12+(i*4)+3)) |
| a, b := e1, e0 |
| if i == 0 { |
| VMOVDQU(Mem{Base: data}.Offset(16*3), msg3) |
| PSHUFB(shufMask, msg3) |
| } |
| if i%2 == 1 { |
| a, b = e0, e1 |
| } |
| imm := uint64((12 + i*4) / 20) |
| |
| SHA1NEXTE(msgs[i%4], a) |
| VMOVDQA(abcd, b) |
| SHA1MSG2(msgs[i%4], msgs[(1+i)%4]) |
| SHA1RNDS4(Imm(imm), a, abcd) |
| SHA1MSG1(msgs[i%4], msgs[(3+i)%4]) |
| PXOR(msgs[i%4], msgs[(2+i)%4]) |
| } |
| |
| Comment("Rounds 68-71") |
| SHA1NEXTE(msg1, e1) |
| VMOVDQA(abcd, e0) |
| SHA1MSG2(msg1, msg2) |
| SHA1RNDS4(Imm(3), e1, abcd) |
| PXOR(msg1, msg3) |
| |
| Comment("Rounds 72-75") |
| SHA1NEXTE(msg2, e0) |
| VMOVDQA(abcd, e1) |
| SHA1MSG2(msg2, msg3) |
| SHA1RNDS4(Imm(3), e0, abcd) |
| |
| Comment("Rounds 76-79") |
| SHA1NEXTE(msg3, e1) |
| VMOVDQA(abcd, e0) |
| SHA1RNDS4(Imm(3), e1, abcd) |
| |
| Comment("Add saved E and ABCD") |
| SHA1NEXTE(e0_save, e0) |
| PADDD(abcd_save, abcd) |
| |
| Comment("Check if we are done, if not return to the loop") |
| ADDQ(Imm(64), data) |
| CMPQ(data, len) |
| JNE(LabelRef("loop")) |
| |
| Comment("Write the hash state back to digest") |
| PSHUFD(Imm(0x1b), abcd, abcd) |
| VMOVDQU(abcd, Mem{Base: digest}) |
| PEXTRD(Imm(3), e0, Mem{Base: digest}.Offset(16)) |
| |
| Label("done") |
| RET() |
| } |
| |
| func flipMask() Mem { |
| mask := GLOBL("shuffle_mask", RODATA) |
| // 0x000102030405060708090a0b0c0d0e0f |
| DATA(0x00, U64(0x08090a0b0c0d0e0f)) |
| DATA(0x08, U64(0x0001020304050607)) |
| return mask |
| } |
| |
| func upperMask() Mem { |
| mask := GLOBL("upper_mask", RODATA) |
| // 0xFFFFFFFF000000000000000000000000 |
| DATA(0x00, U64(0x0000000000000000)) |
| DATA(0x08, U64(0xFFFFFFFF00000000)) |
| return mask |
| } |
