/* * Poly1305 authenticator algorithm, RFC7539, x64 SSE2 functions * * Copyright (C) 2015 Martin Willi * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. */ #include <linux/linkage.h> .data .align 16 ANMASK: .octa 0x0000000003ffffff0000000003ffffff ORMASK: .octa 0x00000000010000000000000001000000 .text #define h0 0x00(%rdi) #define h1 0x04(%rdi) #define h2 0x08(%rdi) #define h3 0x0c(%rdi) #define h4 0x10(%rdi) #define r0 0x00(%rdx) #define r1 0x04(%rdx) #define r2 0x08(%rdx) #define r3 0x0c(%rdx) #define r4 0x10(%rdx) #define s1 0x00(%rsp) #define s2 0x04(%rsp) #define s3 0x08(%rsp) #define s4 0x0c(%rsp) #define m %rsi #define h01 %xmm0 #define h23 %xmm1 #define h44 %xmm2 #define t1 %xmm3 #define t2 %xmm4 #define t3 %xmm5 #define t4 %xmm6 #define mask %xmm7 #define d0 %r8 #define d1 %r9 #define d2 %r10 #define d3 %r11 #define d4 %r12 ENTRY(poly1305_block_sse2) # %rdi: Accumulator h[5] # %rsi: 16 byte input block m # %rdx: Poly1305 key r[5] # %rcx: Block count # This single block variant tries to improve performance by doing two # multiplications in parallel using SSE instructions. There is quite # some quardword packing involved, hence the speedup is marginal. push %rbx push %r12 sub $0x10,%rsp # s1..s4 = r1..r4 * 5 mov r1,%eax lea (%eax,%eax,4),%eax mov %eax,s1 mov r2,%eax lea (%eax,%eax,4),%eax mov %eax,s2 mov r3,%eax lea (%eax,%eax,4),%eax mov %eax,s3 mov r4,%eax lea (%eax,%eax,4),%eax mov %eax,s4 movdqa ANMASK(%rip),mask .Ldoblock: # h01 = [0, h1, 0, h0] # h23 = [0, h3, 0, h2] # h44 = [0, h4, 0, h4] movd h0,h01 movd h1,t1 movd h2,h23 movd h3,t2 movd h4,h44 punpcklqdq t1,h01 punpcklqdq t2,h23 punpcklqdq h44,h44 # h01 += [ (m[3-6] >> 2) & 0x3ffffff, m[0-3] & 0x3ffffff ] movd 0x00(m),t1 movd 0x03(m),t2 psrld $2,t2 punpcklqdq t2,t1 pand mask,t1 paddd t1,h01 # h23 += [ (m[9-12] >> 6) & 0x3ffffff, (m[6-9] >> 4) & 0x3ffffff ] movd 0x06(m),t1 movd 0x09(m),t2 psrld $4,t1 psrld $6,t2 punpcklqdq t2,t1 pand mask,t1 paddd t1,h23 # h44 += [ (m[12-15] >> 8) | (1 << 24), (m[12-15] >> 8) | (1 << 24) ] mov 0x0c(m),%eax shr $8,%eax or $0x01000000,%eax movd %eax,t1 pshufd $0xc4,t1,t1 paddd t1,h44 # t1[0] = h0 * r0 + h2 * s3 # t1[1] = h1 * s4 + h3 * s2 movd r0,t1 movd s4,t2 punpcklqdq t2,t1 pmuludq h01,t1 movd s3,t2 movd s2,t3 punpcklqdq t3,t2 pmuludq h23,t2 paddq t2,t1 # t2[0] = h0 * r1 + h2 * s4 # t2[1] = h1 * r0 + h3 * s3 movd r1,t2 movd r0,t3 punpcklqdq t3,t2 pmuludq h01,t2 movd s4,t3 movd s3,t4 punpcklqdq t4,t3 pmuludq h23,t3 paddq t3,t2 # t3[0] = h4 * s1 # t3[1] = h4 * s2 movd s1,t3 movd s2,t4 punpcklqdq t4,t3 pmuludq h44,t3 # d0 = t1[0] + t1[1] + t3[0] # d1 = t2[0] + t2[1] + t3[1] movdqa t1,t4 punpcklqdq t2,t4 punpckhqdq t2,t1 paddq t4,t1 paddq t3,t1 movq t1,d0 psrldq $8,t1 movq t1,d1 # t1[0] = h0 * r2 + h2 * r0 # t1[1] = h1 * r1 + h3 * s4 movd r2,t1 movd r1,t2 punpcklqdq t2,t1 pmuludq h01,t1 movd r0,t2 movd s4,t3 punpcklqdq t3,t2 pmuludq h23,t2 paddq t2,t1 # t2[0] = h0 * r3 + h2 * r1 # t2[1] = h1 * r2 + h3 * r0 movd r3,t2 movd r2,t3 punpcklqdq t3,t2 pmuludq h01,t2 movd r1,t3 movd r0,t4 punpcklqdq t4,t3 pmuludq h23,t3 paddq t3,t2 # t3[0] = h4 * s3 # t3[1] = h4 * s4 movd s3,t3 movd s4,t4 punpcklqdq t4,t3 pmuludq h44,t3 # d2 = t1[0] + t1[1] + t3[0] # d3 = t2[0] + t2[1] + t3[1] movdqa t1,t4 punpcklqdq t2,t4 punpckhqdq t2,t1 paddq t4,t1 paddq t3,t1 movq t1,d2 psrldq $8,t1 movq t1,d3 # t1[0] = h0 * r4 + h2 * r2 # t1[1] = h1 * r3 + h3 * r1 movd r4,t1 movd r3,t2 punpcklqdq t2,t1 pmuludq h01,t1 movd r2,t2 movd r1,t3 punpcklqdq t3,t2 pmuludq h23,t2 paddq t2,t1 # t3[0] = h4 * r0 movd r0,t3 pmuludq h44,t3 # d4 = t1[0] + t1[1] + t3[0] movdqa t1,t4 psrldq $8,t4 paddq t4,t1 paddq t3,t1 movq t1,d4 # d1 += d0 >> 26 mov d0,%rax shr $26,%rax add %rax,d1 # h0 = d0 & 0x3ffffff mov d0,%rbx and $0x3ffffff,%ebx # d2 += d1 >> 26 mov d1,%rax shr $26,%rax add %rax,d2 # h1 = d1 & 0x3ffffff mov d1,%rax and $0x3ffffff,%eax mov %eax,h1 # d3 += d2 >> 26 mov d2,%rax shr $26,%rax add %rax,d3 # h2 = d2 & 0x3ffffff mov d2,%rax and $0x3ffffff,%eax mov %eax,h2 # d4 += d3 >> 26 mov d3,%rax shr $26,%rax add %rax,d4 # h3 = d3 & 0x3ffffff mov d3,%rax and $0x3ffffff,%eax mov %eax,h3 # h0 += (d4 >> 26) * 5 mov d4,%rax shr $26,%rax lea (%eax,%eax,4),%eax add %eax,%ebx # h4 = d4 & 0x3ffffff mov d4,%rax and $0x3ffffff,%eax mov %eax,h4 # h1 += h0 >> 26 mov %ebx,%eax shr $26,%eax add %eax,h1 # h0 = h0 & 0x3ffffff andl $0x3ffffff,%ebx mov %ebx,h0 add $0x10,m dec %rcx jnz .Ldoblock add $0x10,%rsp pop %r12 pop %rbx ret ENDPROC(poly1305_block_sse2) #define u0 0x00(%r8) #define u1 0x04(%r8) #define u2 0x08(%r8) #define u3 0x0c(%r8) #define u4 0x10(%r8) #define hc0 %xmm0 #define hc1 %xmm1 #define hc2 %xmm2 #define hc3 %xmm5 #define hc4 %xmm6 #define ru0 %xmm7 #define ru1 %xmm8 #define ru2 %xmm9 #define ru3 %xmm10 #define ru4 %xmm11 #define sv1 %xmm12 #define sv2 %xmm13 #define sv3 %xmm14 #define sv4 %xmm15 #undef d0 #define d0 %r13 ENTRY(poly1305_2block_sse2) # %rdi: Accumulator h[5] # %rsi: 16 byte input block m # %rdx: Poly1305 key r[5] # %rcx: Doubleblock count # %r8: Poly1305 derived key r^2 u[5] # This two-block variant further improves performance by using loop # unrolled block processing. This is more straight forward and does # less byte shuffling, but requires a second Poly1305 key r^2: # h = (h + m) * r => h = (h + m1) * r^2 + m2 * r push %rbx push %r12 push %r13 # combine r0,u0 movd u0,ru0 movd r0,t1 punpcklqdq t1,ru0 # combine r1,u1 and s1=r1*5,v1=u1*5 movd u1,ru1 movd r1,t1 punpcklqdq t1,ru1 movdqa ru1,sv1 pslld $2,sv1 paddd ru1,sv1 # combine r2,u2 and s2=r2*5,v2=u2*5 movd u2,ru2 movd r2,t1 punpcklqdq t1,ru2 movdqa ru2,sv2 pslld $2,sv2 paddd ru2,sv2 # combine r3,u3 and s3=r3*5,v3=u3*5 movd u3,ru3 movd r3,t1 punpcklqdq t1,ru3 movdqa ru3,sv3 pslld $2,sv3 paddd ru3,sv3 # combine r4,u4 and s4=r4*5,v4=u4*5 movd u4,ru4 movd r4,t1 punpcklqdq t1,ru4 movdqa ru4,sv4 pslld $2,sv4 paddd ru4,sv4 .Ldoblock2: # hc0 = [ m[16-19] & 0x3ffffff, h0 + m[0-3] & 0x3ffffff ] movd 0x00(m),hc0 movd 0x10(m),t1 punpcklqdq t1,hc0 pand ANMASK(%rip),hc0 movd h0,t1 paddd t1,hc0 # hc1 = [ (m[19-22] >> 2) & 0x3ffffff, h1 + (m[3-6] >> 2) & 0x3ffffff ] movd 0x03(m),hc1 movd 0x13(m),t1 punpcklqdq t1,hc1 psrld $2,hc1 pand ANMASK(%rip),hc1 movd h1,t1 paddd t1,hc1 # hc2 = [ (m[22-25] >> 4) & 0x3ffffff, h2 + (m[6-9] >> 4) & 0x3ffffff ] movd 0x06(m),hc2 movd 0x16(m),t1 punpcklqdq t1,hc2 psrld $4,hc2 pand ANMASK(%rip),hc2 movd h2,t1 paddd t1,hc2 # hc3 = [ (m[25-28] >> 6) & 0x3ffffff, h3 + (m[9-12] >> 6) & 0x3ffffff ] movd 0x09(m),hc3 movd 0x19(m),t1 punpcklqdq t1,hc3 psrld $6,hc3 pand ANMASK(%rip),hc3 movd h3,t1 paddd t1,hc3 # hc4 = [ (m[28-31] >> 8) | (1<<24), h4 + (m[12-15] >> 8) | (1<<24) ] movd 0x0c(m),hc4 movd 0x1c(m),t1 punpcklqdq t1,hc4 psrld $8,hc4 por ORMASK(%rip),hc4 movd h4,t1 paddd t1,hc4 # t1 = [ hc0[1] * r0, hc0[0] * u0 ] movdqa ru0,t1 pmuludq hc0,t1 # t1 += [ hc1[1] * s4, hc1[0] * v4 ] movdqa sv4,t2 pmuludq hc1,t2 paddq t2,t1 # t1 += [ hc2[1] * s3, hc2[0] * v3 ] movdqa sv3,t2 pmuludq hc2,t2 paddq t2,t1 # t1 += [ hc3[1] * s2, hc3[0] * v2 ] movdqa sv2,t2 pmuludq hc3,t2 paddq t2,t1 # t1 += [ hc4[1] * s1, hc4[0] * v1 ] movdqa sv1,t2 pmuludq hc4,t2 paddq t2,t1 # d0 = t1[0] + t1[1] movdqa t1,t2 psrldq $8,t2 paddq t2,t1 movq t1,d0 # t1 = [ hc0[1] * r1, hc0[0] * u1 ] movdqa ru1,t1 pmuludq hc0,t1 # t1 += [ hc1[1] * r0, hc1[0] * u0 ] movdqa ru0,t2 pmuludq hc1,t2 paddq t2,t1 # t1 += [ hc2[1] * s4, hc2[0] * v4 ] movdqa sv4,t2 pmuludq hc2,t2 paddq t2,t1 # t1 += [ hc3[1] * s3, hc3[0] * v3 ] movdqa sv3,t2 pmuludq hc3,t2 paddq t2,t1 # t1 += [ hc4[1] * s2, hc4[0] * v2 ] movdqa sv2,t2 pmuludq hc4,t2 paddq t2,t1 # d1 = t1[0] + t1[1] movdqa t1,t2 psrldq $8,t2 paddq t2,t1 movq t1,d1 # t1 = [ hc0[1] * r2, hc0[0] * u2 ] movdqa ru2,t1 pmuludq hc0,t1 # t1 += [ hc1[1] * r1, hc1[0] * u1 ] movdqa ru1,t2 pmuludq hc1,t2 paddq t2,t1 # t1 += [ hc2[1] * r0, hc2[0] * u0 ] movdqa ru0,t2 pmuludq hc2,t2 paddq t2,t1 # t1 += [ hc3[1] * s4, hc3[0] * v4 ] movdqa sv4,t2 pmuludq hc3,t2 paddq t2,t1 # t1 += [ hc4[1] * s3, hc4[0] * v3 ] movdqa sv3,t2 pmuludq hc4,t2 paddq t2,t1 # d2 = t1[0] + t1[1] movdqa t1,t2 psrldq $8,t2 paddq t2,t1 movq t1,d2 # t1 = [ hc0[1] * r3, hc0[0] * u3 ] movdqa ru3,t1 pmuludq hc0,t1 # t1 += [ hc1[1] * r2, hc1[0] * u2 ] movdqa ru2,t2 pmuludq hc1,t2 paddq t2,t1 # t1 += [ hc2[1] * r1, hc2[0] * u1 ] movdqa ru1,t2 pmuludq hc2,t2 paddq t2,t1 # t1 += [ hc3[1] * r0, hc3[0] * u0 ] movdqa ru0,t2 pmuludq hc3,t2 paddq t2,t1 # t1 += [ hc4[1] * s4, hc4[0] * v4 ] movdqa sv4,t2 pmuludq hc4,t2 paddq t2,t1 # d3 = t1[0] + t1[1] movdqa t1,t2 psrldq $8,t2 paddq t2,t1 movq t1,d3 # t1 = [ hc0[1] * r4, hc0[0] * u4 ] movdqa ru4,t1 pmuludq hc0,t1 # t1 += [ hc1[1] * r3, hc1[0] * u3 ] movdqa ru3,t2 pmuludq hc1,t2 paddq t2,t1 # t1 += [ hc2[1] * r2, hc2[0] * u2 ] movdqa ru2,t2 pmuludq hc2,t2 paddq t2,t1 # t1 += [ hc3[1] * r1, hc3[0] * u1 ] movdqa ru1,t2 pmuludq hc3,t2 paddq t2,t1 # t1 += [ hc4[1] * r0, hc4[0] * u0 ] movdqa ru0,t2 pmuludq hc4,t2 paddq t2,t1 # d4 = t1[0] + t1[1] movdqa t1,t2 psrldq $8,t2 paddq t2,t1 movq t1,d4 # d1 += d0 >> 26 mov d0,%rax shr $26,%rax add %rax,d1 # h0 = d0 & 0x3ffffff mov d0,%rbx and $0x3ffffff,%ebx # d2 += d1 >> 26 mov d1,%rax shr $26,%rax add %rax,d2 # h1 = d1 & 0x3ffffff mov d1,%rax and $0x3ffffff,%eax mov %eax,h1 # d3 += d2 >> 26 mov d2,%rax shr $26,%rax add %rax,d3 # h2 = d2 & 0x3ffffff mov d2,%rax and $0x3ffffff,%eax mov %eax,h2 # d4 += d3 >> 26 mov d3,%rax shr $26,%rax add %rax,d4 # h3 = d3 & 0x3ffffff mov d3,%rax and $0x3ffffff,%eax mov %eax,h3 # h0 += (d4 >> 26) * 5 mov d4,%rax shr $26,%rax lea (%eax,%eax,4),%eax add %eax,%ebx # h4 = d4 & 0x3ffffff mov d4,%rax and $0x3ffffff,%eax mov %eax,h4 # h1 += h0 >> 26 mov %ebx,%eax shr $26,%eax add %eax,h1 # h0 = h0 & 0x3ffffff andl $0x3ffffff,%ebx mov %ebx,h0 add $0x20,m dec %rcx jnz .Ldoblock2 pop %r13 pop %r12 pop %rbx ret ENDPROC(poly1305_2block_sse2)